Operation and Maintenance Manual for

USFilter 

10 Technology Drive 

Lowell, Massachusetts 01851 

Tel: (800) 875-7873 • Fax: (978) 441-6025 

Email: 

Lowell_TechSupport@USFilter.com 

Operation and 

Maintenance 

Manual 

for 

LC 

Vantage Series 

Reverse Osmosis Systems 

Catalog # _______________________ 

Serial # ________________________ 

68/OMLC – Vantage LC Manual 11/02 Rev. 3

CAUTIONS AND WARNINGS 

Prior to operating or servicing this device, this manual must be read and understood. If something 

is not clear, call for assistance before proceeding. Keep this and other associated manuals for 

future reference and for new operators or qualified service personnel. 

All electrical work should be performed by a qualified electrician in accordance with the latest 

edition of the National Electrical Code, as well as local codes and regulations. 

To avoid electrical shock hazard, do not remove covers or panels when power is supplied to the 

device. Do not operate the device when covers or panels are removed. 

WARNING 

A faulty pump motor or wiring can be a serious shock hazard if it or 

surrounding water is accessible to human contact. To avoid this danger, 

DO NOT remove any grounding wire from the system. 

DISCLAIMER STATEMENT 

This operation and maintenance manual is intended to be used with the component manufacturer 

literature provided in the Appendix. These manuals should provide complete and accurate 

information to meet your operating and/or service requirements based on the information available 

at the time of publication. However, USFilter assumes no responsibility for the technical content of 

the manufacturer literature. 

This manual should be read fully and understood before installation, operation or maintenance of 

the system is attempted. The information in this manual may not cover all operating details or 

variations or provide for all conditions in connection with installation, operation and maintenance. 

Should questions arise which are not answered specifically in this manual, contact the USFilter 

Technical Support Department at the phone number provided on the cover of this manual. 

USFilter reserves the right to make engineering refinements that may not be reflected in these 

manuals. The material in these manuals is for informational purposes and is subject to change 

without notice and should not be construed as a commitment by USFilter. USFilter assumes no 

responsibility for any errors that may appear in this document. This manual is believed to be 

complete and accurate at the time of publication. In no event shall USFilter be liable for incidental 

or consequential damages in connection with or arising from the use of this manual. 

©Copyright 2001 USFilter 

Printed in the United States of America. All rights reserved. 

THIS BOOK OR PARTS THEREOF MAY NOT BE REPRODUCED IN ANY FORM 

WITHOUT THE WRITTEN PERMISSION OF THE PUBLISHERS. 

PROPRIETARY RIGHTS STATEMENT

This manual discloses information in which USFilter has proprietary rights. Neither receipt nor 

possession of this manual confers or transfers any right to the client, and by its retention hereof, the 

client acknowledges that it will not reproduce or cause to be reproduced, in whole or in part, any 

such information except by written permission from USFilter. The client shall have the right to use 

and disclose to its employees the information contained herein for the purpose of operating and 

maintaining the USFilter equipment, and for no other purpose. 

In the event the content of this manual is altered or section/items are omitted during a reproduction, 

in whole or in part, and instructions or definitions within the reproduction result in personal injury to 

those who follow the altered instructions, the burden of responsibility for personal injury falls solely 

on the party who affects the reproduction. 

MANUAL USER’S GUIDE 

This manual describes the procedures necessary to install, operate, and maintain your USFilter 

Reverse Osmosis system. Please read this manual carefully before installing and operating your 

equipment. The equipment warranty may be voided if installation or operation instructions are not 

followed correctly. 

Warnings, Cautions, and Notes are used to attract attention to essential or critical information. 

Warnings and Cautions will appear before the text associated with them, and notes can appear 

either before or after associated text. 

WARNING 

CAUTION 

Warnings indicate condition, practices, or procedures which must be 

observed to avoid personal injury or fatalities. 

Cautions indicate a situation that may cause damage or destruction of 

equipment or may pose a long term health hazard. 

NOTE: Notes are used to add information, state exceptions, and point out areas that 

may be of greater interest or importance. 

EQUIPMENT SUPPORT 

USFilter continually strives to provide safe, efficient, trouble-free equipment using the optimum 

technology for your application. If problems should develop, USFilter’s worldwide network of 

technical support will be available to provide assistance. For service, sales, parts, or additional 

manual copies call your area representative or USFilter, Technical Support Department at the 

number provided on the cover of this manual.

TABLE OF CONTENTS 

SECTION DESCRIPTION PAGE 

1.0 INTRODUCTION 

1.1 System Function.................................................................................... 1-1 

1.2 Quality Assurance/Quality Control......................................................... 1-1 

1.3 Functions of the System Components................................................... 1-2 

2.0 SYSTEM INSTALLATION 

2.1 Precautions Before Installation.............................................................. 2-1 

2.2 Unpacking.............................................................................................. 2-1 

2.3 System Location .................................................................................... 2-1 

2.4 Power Requirements ............................................................................. 2-1 

2.5 Water Requirements.............................................................................. 2-2 

2.6 Product Line .......................................................................................... 2-2 

2.7 Reservoir (optional) ............................................................................... 2-2 

2.8 Accessory Sensors (Pretreat Interlock, Chem Feed & Tank Level) ...... 2-2 

2.9 Setting the Flush Cycle Time and Duration ........................................... 2-3 

2.10 Before Power Turn On........................................................................... 2-3 

2.11 Installation of Reverse Osmosis Membrane(s)...................................... 2-3 

3.0 OPERATING INSTRUCTIONS 

3.1 Controls and Indicators.......................................................................... 3-1 

3.2 Initial Startup of Reverse Osmosis System ........................................... 3-1 

3.3 Initial Flushing of the System................................................................. 3-2 

3.4 Normal Operations................................................................................. 3-2 

3.5 Shutdown (Less Than 4 Days) .............................................................. 3-4 

3.6 Long Term Shutdown Procedure........................................................... 3-4 

4.0 SYSTEM MAINTENANCE 

4.1 General.................................................................................................. 4-1 

4.2 Sanitizing the Reverse Osmosis System............................................... 4-1 

4.3 Cleaning the RO Membranes ................................................................ 4-5 

4.4 Maintenance Schedule ......................................................................... 4-8

TABLE OF CONTENTS 

SECTION DESCRIPTION PAGE 

5.0 TROUBLESHOOTING 

5.1 System Inoperative................................................................................ 5-1 

5.2 Low System Pressure............................................................................ 5-1 

5.3 Low Percent Recovery........................................................................... 5-1 

5.4 High Percent Recovery.......................................................................... 5-1 

5.5 Low Salt Rejection................................................................................. 5-2 

5.6 System Keeps Shutting Off.................................................................... 5-2 

5.7 System Shutoff, Low Pressure .............................................................. 5-2 

5.8 System Shutoff, High Temperature ....................................................... 5-2 

5.9 Low Product Flow Rate.......................................................................... 5-3 

5.10 Motor Overload Shutdown ..................................................................... 5-3 

5.11 Controller Malfunction............................................................................ 5-3 

6.0 WARRANTY 

6.1 General Limited Warranty...................................................................... 6-1 

6.2 Water System Limited Warranty ............................................................ 6-1 

7.0 APPENDIX 

7.1 Glossary of Terms ................................................................................. 7-1 

7.2 Replacement/Spare Parts List -- LC Model ........................................... 7-2 

7.3 RO Data Collection Form....................................................................... 7-4 

7.4 QA Data Report ..................................................................................... 7-7 

7.5 Drawings................................................................................................ 7-8 

7.6 Component Manufacturers Literature.................................................... 7-9 

TABLE # DESCRIPTION PAGE 

4-1 Sanitization Times and Concentrations for Polyamide .......................... 4-2 

Thin Film Composite Membranes 

4-2 Cleaning Solutions for Polyamide Thin Film.......................................... 4-8 

Composite Membranes

For Product and Service Information 

USFilter 


Lowell, MA 01851 

Telephone: (978) 934-9349 

FAX: (978) 441-6025 

For Technical Support 

Telephone: (800) 875-7873 Extension 5000 

Email: Lowell_TechSupport@USFilter.com

LC Manual 11/02 Rev. 3 INTRODUCTION 

1.0 INTRODUCTION 

Congratulations on your selection of this USFilter water purification system. This system is 

designed and manufactured to the highest standard of quality and fully tested and inspected 

prior to shipment. In order to get maximum performance, we ask you to read all of the following 

instructions before installing and operating this system. Any warranty offered will be void unless 

directions are followed exactly. 

This manual is divided into sections for easy reference. Review this manual thoroughly and 

then return to section 2.0 System Installation for step-by-step installation instructions. 

If you need technical assistance in operating or maintaining your USFilter unit, call your local 

representative. If you require further assistance call USFilter, Technical Support Department at 

the phone number provided on the cover of this manual. 

1.1 SYSTEM FUNCTION 

The function of a Reverse Osmosis (RO) system is to remove contaminants from a 

water supply using a Reverse Osmosis (RO) membrane. The system produces purified 

water that is low in inorganic salts, organic matter and bacteria. The purified water can 

be used as a direct feed to a distribution system or stored in a reservoir. 

RO systems operate on the principle of passing water through the membrane under 

high-pressure. Some of the water passes through the membrane and is purified 

(product or permeate), the remainder of the water containing the impurities (concentrate 

or reject) is not passed through the membrane and is diverted to drain. In addition, a 

portion of the reject is returned (reject recirc or recirculation) upstream of the pump to 

improve the operation and productivity of the RO system. A single prefilter is used in all 

systems to reduce the amount of particulate contamination reaching the membranes. 

Please refer to the Product Description/Equipment Specifications in the Appendix for 

other parameters important to the operation of the system. 

1.2 QUALITY ASSURANCE/QUALITY CONTROL 

At USFilter we have defined Quality Assurance and Quality Control into a series of 

engineering and manufacturing practices and control procedures to insure that you, our 

customer, receive the finest product available in the world. We will continue to update 

these practices and procedures on an ongoing basis in an effort to improve our systems 

and to insure that they continue to reflect state-of-the-art technology and reliability. 

Quality assurance is the cornerstone of our quality program. It begins with the selection 

and qualification of components and materials. Before suppliers are selected, their 

products must meet or exceed rigid standards set by our Quality Assurance Department. 

From that point, our incoming material inspection insures only reliable components will 

be used to manufacture systems. Numerous checks are performed as the system 

passes through the manufacturing process. The completed system must pass a series 

of tests before release for shipment to insure the system meets technical and 

performance specifications. In the Appendix is a copy of our Quality Assurance Data 

Report for your system. 

Quality audits do not improve products. They do, however, insure that each system 

meets or exceeds specifications required for your application. 

USFilter 1-1

INTRODUCTION LC Manual 11/02 Rev. 3 

Customer feedback is also an important element of our program. Division heads meet 

on a routine basis to review customer feedback and initiate actions that result in process 

and product improvements. 

1.3 FUNCTIONS OF THE SYSTEM COMPONENTS 

Refer to the Process & Instrumentation Diagram (P&ID) in the Appendix. 

A. Low Feed Pressure Switch 

A low feed pressure switch protects the high-pressure pump. If the feed 

pressure to the pump falls below 15 psig the low feed pressure switch shuts the 

system down. The system will automatically restart four more times and if the 

low pressure situation has not been corrected after the fifth restart the system will 

remain shut down and will not restart until the alarm condition has been 

acknowledged and rectified. 

B. Reverse Osmosis Pump 

The RO system pump is a single stage positive displacement, rotary vane pump 

driven by an AC motor. The pump motor is powered on and off through the 

controller by a motor starter. 

C. High Membrane Feed Pressure Switch 

A high membrane feed pressure switch protects the membranes and RO 

pressure vessels from potentially damaging pressures. If the membrane 

pressure exceeds the safe operating pressure for the pressure vessels and/or 

membranes, the high-pressure switch shuts the system down and requires 

operator intervention prior to restart. 

D. Reverse Osmosis Membranes 

The prefiltered water enters the RO pressure vessel and passes over the surface 

of an RO membrane. A portion of the feed water continues out of the system 

through the reject and reject-recycle needle valves; and is either directed to drain 

or just upstream of the pump to increase the feed flow rate. The remainder of the 

water permeates the membrane (product) and is directed to an accessory 

storage reservoir or point of use. Percent recovery (the ratio of RO product water 

to feedwater) will vary depending on water quality and the application. 

E. Reject / Reject Recirculation Throttle Valves 

The flow rates of water exiting the RO membranes are controlled by the reject 

and reject recirculation valves. Closing the reject valve increases the pressure to 

the membranes and reduces the amount of water to drain. Recycling a portion of 

the reject water permits part of the total reject flow to be returned upstream of the 

high-pressure pump and can improve RO performance and production. Reject 

recirculation can be used to increase the overall recovery of the system up to the 

scaling limit. 

F. Autoflush Valve 

In the TANK FEED and STANDBY modes, the controller automatically opens the 

autoflush solenoid valve (located in the reject piping) for a predetermined 

duration at a preset interval, bypassing the reject needle valve, thereby flushing 

1-2 USFilter

LC Manual 11/02 Rev. 3 INTRODUCTION 

the concentrate line in a high flow, low pressure condition. The duration and 

interval of this flush cycle is operator settable and is determined by the fouling 

characteristics of the feedwater. In the DIRECT FEED mode the autoflush 

function is inhibited. 

G. Controller 

The controller has the following capabilities (please refer to the component 

manufacturer literature located in the Appendix for a more detailed explanation of 

these features): 

1. Low-pressure shutdown - The pump motor is shut down when the feed 

water pressure falls below 15 psig. 

2. High-pressure shutdown – The pump motor is shutdown when the 

pressure to the membranes exceeds the set point to prevent damage to 

the RO pressure vessels, membranes or other components. 

3. High temperature shutdown - The pump motor is shut down on high feed 

water temperature to protect the RO membranes from exposure to 

damaging temperatures. 

4. Low percent rejection alarm - The alarm function is activated when the 

percent rejection falls below determined limits to warn the operator the 

product water quality no longer meets specifications. 

5. Pump startup delay - There is a fifteen-second delay after pressing the 

system start button before the pump starts. 

6. Autoflush - The system automatically flushes the reject piping for a user 

settable duration at a user settable interval when the system is in either 

the STANDBY or TANK FEED mode. 

7. Tank full shutdown - The system shuts down when the level switch 

(optional) indicates that the storage tank (optional) is full. Automatic 

restart occurs after either a predetermined interval or when the low-level 

tank switch is activated and the user settable delay has expired. 

8. Pretreatment Interlock - This feature stops the system when the 

pretreatment equipment is in the regeneration cycle and restarts the 

system automatically when the regeneration cycle is completed. 

9. Chemical feed signal – This feature provides the necessary output signal 

to automatically start and stop a chemical feed system when the RO 

starts and stops. 

10. Modem (optional) – The controller can be equipped with a modem for 

remote monitoring and data acquisition. 

H. Accessories 

The RO system can be used to feed a distribution loop, another piece of 

equipment directly, or an accessory reservoir. If an accessory reservoir is used, 

a level switch or level switches are necessary and the controller must be 

operated in the TANK FEED mode. These accessories are connected to the 

controller enclosure by wiring the electrical leads to the high tank level and mid 

tank level switch input connections. Optional terminals (pretreatment interlock) 

USFilter 1-3

INTRODUCTION LC Manual 11/02 Rev. 3 

have been placed in the controller enclosure for shutdown by external signals. 

Normal operation will resume automatically when the pretreatment regeneration 

is completed. Optional terminals (chemical feed output) have been placed in the 

controller enclosure to start and stop a chemical feed system. 

See the installation section for instructions on electrical connection of the 

accessories. 

1-4 USFilter

LC Manual 11/02 Rev. 3 SYSTEM INSTALLATION 

2.0 SYSTEM INSTALLATION 

2.1 PRECAUTIONS BEFORE INSTALLATION 

CAUTION 

The following are feed water source requirements: 

A. Inlet pressure of 15 to 50 psig at design feed flow. Recommended minimum inlet 

pressure is 25 psig. 

B. Temperature of between 15.5°C (60°F) and 45°C (113°F). Recommended 

operating temperature is 25°C (77°F). 

C. Free chlorine concentration must be non-detectable on a continuous basis (

SYSTEM INSTALLATION LC Manual 11/02 Rev. 3 

Ground the power cable to the ground connection in the motor starter housing box. 

Branch circuit conductors supplying the motor shall have an amperage capacity of not 

less than 125% of the motor full load current rating as defined by the National Electric 

Code. 

2.5 WATER REQUIREMENTS 

The inlet water supply must be adequate to provide the minimum flow requirement 

shown in the Product Description/Equipment Specifications in the Appendix. The inlet 

line should be sized to deliver this flow with a recommended pressure of 25 psig at the 

RO unit. A shutoff valve within 10 feet of the unit and a cleaning connection should be 

provided. A sample valve for checking feed water quality is located upstream of the 

prefilter, thus ensuring a true feed water sample. 

2.6 PRODUCT LINE 

At a minimum the field installed product line should be the same size as skid mounted 

product discharge from the RO system. In some cases it may be necessary to increase 

to the next pipe size to ensure against excessive pressure loss in the product to storage 

tank or point of use piping. A sample valve is located in the product line to facilitate 

sampling the quality of the product water. A flowmeter is supplied with the unit to 

continuously measure the product flow. The flowmeters supplied are fluid calibrated to 

obtain accurate flow measurements. Any replacement flowmeter should also be fluid 

calibrated. 

2.7 RESERVOIR (OPTIONAL) 

RO systems are designed to produce a constant supply of purified water. The 

membranes must be maintained in an operational or standby state to retain full 

effectiveness. Therefore, a reservoir is usually required, unless the system operates in 

direct-feed mode. The reservoir size is a function of space allocation in relation to 

system output. Therefore, size selection should be in accordance with this factor. 

USFilter can supply reservoirs of any desired capacity as an accessory to the basic RO 

system. 

2.8 ACCESSORY SENSORS (PRETREATMENT INTERLOCK, CHEMICAL FEED AND 

TANK LEVEL(S)) 

Provisions have been made for shutdown by accessory sensors, provided such sensors 

are equivalent to a single-pole, single-throw switch. When a shutdown condition exists, 

the RO system will resume normal operation automatically when the alarm condition has 

been corrected or no longer exists. Please refer to the steps that follow for installation 

instructions and locations (please refer to the RO Controller manual in the Appendix for 

further instruction). 

A. Open the controller enclosure door to expose the terminal connections. 

B. Dry contacts for the PRETREATMENT INTERLOCK should be connected 

between terminals 19 and 20 of the terminal strip. The CHEMICAL FEED 

SYSTEM OUTPUT accessory is connected between terminals 29 and 30 of the 

terminal strip. The HIGH TANK level switch input is connected between terminals 

17 and 18. The MID TANK level switch input sensor is connected between 

terminals 15 and 16. 

2-2 USFilter

LC Manual 11/02 Rev. 3 SYSTEM INSTALLATION 

NOTE: A normally closed switch or switches should be selected. The MC10 Controller 

may be used to connect one level switch to the controller (instructions are 

included with the MC10 manual located in the Appendix). 

C. To connect the accessory, remove the shorting wire where applicable and 

connect a single pole single throw normally closed sensor (TANK SWITCHES 

and PRETREATMENT INTERLOCK) between the respective terminals; for 

CHEMICAL FEED SYSTEM OUTPUT connect the wires from the chemical feed 

system relay (by others). It is recommended that shielded cable, properly 

grounded, be used to wire these sensors to avoid radio signal interference with 

these functions. 

2.9 SETTING THE FLUSH CYCLE TIME AND DURATION 

Refer to the MC10 RO Controller manual in the Appendix for detailed instructions. 

2.10 BEFORE POWER TURN ON 

CAUTION 

CAUTION 

CAUTION 

If an isolation valve is located downstream of the RO unit in the product, 

reject or autoflush piping, a pressure relief device must be installed to 

avoid an over pressurization condition that could irreversibly damage the 

RO unit and related components. 

Verify that all retaining “U” pins are in place on the RO pressure vessels 

before turning on the pump. 

Be sure the product water will not enter the user system during startup. 

The RO system must be operated for four hours to flush out the 

preservative solution before connecting to the user system. 

Once the feed water is plumbed to the system and the electrical power is connected, the 

electrician should verify correct motor rotation. 

2.11 INSTALLATION OF REVERSE OSMOSIS MEMBRANE(S) 

CAUTION 

CAUTION 

Never engage or disengage retaining “U” pins without wearing safety 

glasses. 

Never allow the RO membrane to dry out once it has been wet, or 

irreversible damage will result. 

USFilter Reverse Osmosis units are normally shipped with the membranes installed and 

preserved in sodium bisulfite solution. However, should the need arise, the following 

procedures may be followed to install membranes: 

A. Disconnect all tubing from all RO pressure vessel end caps. This is done by 

pushing in the outer ring of the quick disconnect fitting while at the same time 

pulling the tubing out of the fitting. 

USFilter 2-3

SYSTEM INSTALLATION LC Manual 11/02 Rev. 3 

B. Remove RO pressure vessels from the frame, taking care to identify their proper 

location(s). 

C. Remove all “U” pins and end caps from each RO pressure vessel. 

D. Remove each RO membrane from the RO pressure vessel in the same direction 

in which the feed water flows through it. 

E. Before installing the new RO membrane, lightly lubricate the brine (chevron) seal 

and o-rings with glycerin or water. 

F. Load the RO membrane in the direction in which the feed water will flow, 

inserting the end without a brine (chevron) seal first. Be careful not to roll, cut or 

otherwise damage the brine (chevron) seals when loading each membrane. 

G. Replace the end cap into the RO pressure vessel end opposite from loading end. 

Secure the end cap with the retaining “U” pin. 

H. Install the end cap on the feed end and secure it with the other “U” pin. 

I. Re-install RO pressure vessels onto the frame in their proper location(s). 

J. Reconnect the tubing to all end cap tube fittings by pushing into the fitting until 

the tubing “locks” into place. 

2-4 USFilter

LC Manual 11/02 Rev. 3 OPERATING INSTRUCTIONS 

3.1 CONTROLS AND INDICATORS 

3.0 OPERATING INSTRUCTIONS 

The controls and indicators used in the operation of the system are outlined in the MC10 

RO Controller manual located in the Appendix. The operator must be thoroughly familiar 

with the controls and their respective functions for proper operation and in order to 

maintain the quality of the product and eliminate unnecessary shutdowns. 

3.2 INITIAL STARTUP OF REVERSE OSMOSIS SYSTEM 

CAUTION 

CAUTION 

CAUTION 

CAUTION 

Verify that all RO pressure vessel end cap retaining “U” pins are in place 

and secure. 

Do not run the motor for more than 30 seconds backwards or irreversible 

pump damage may result. 

The membrane feed pressure should not be allowed to exceed 225 psig at 

any time during operation. 

A. The operator should verify that appropriate pretreatment is in place and operating 

satisfactorily. Inappropriate or inoperative pretreatment can damage the 

membranes. 

B. Make all water, electrical, and drain connections according to installation 

instructions. 

C. Divert the outlet of the product water to a convenient drain. 

D. Turn on the feed water and the electrical power. With product water diverted to 

drain, fully open the reject throttling valve and close the reject recirculation 

throttling valve. 

E. Place the controller in the DIRECT FEED mode (refer to the Reverse Osmosis 

Controller manual in the Appendix for detailed instructions). Press the SYSTEM 

START button on the controller keypad to start the system, after a fifteen-second 

delay the pump should start. 

F. Check for proper pump rotation. (Please refer to the Pump Information, included 

in the Appendix of this manual for information concerning motor rotation and any 

other electrical requirements.) 

G. Set the reject recirculation flow to zero, but do not exceed 225 psig pressure to 

the membranes. Open the reject valve further if necessary to avoid over 

pressuring the system. 

Do not use reject recirculation option for the first 4 hours of operation to 

speed flush up of the system. 

USFilter 3-1

OPERATING INSTRUCTIONS LC Manual 11/02 Rev. 3 

H. Set the percent rejection alarm setting to 90%. 

I. Check for plumbing leaks and make appropriate repairs as necessary. All 

systems are leak checked at the factory but vibration during transit can cause 

new leaks to develop. 

J. Once the system is checked out and operating correctly, place the controller in 

the desired mode. Read the next section on initial flushing before directing 

product water to the water storage tank or user system. 

3.3 INITIAL FLUSHING OF THE SYSTEM 

Since the RO membranes are shipped with sodium bisulfite preservative solution, initial 

flushing of the system is required. Before operating a new system, and also after the 

replacement of a RO membrane, perform the following steps: 

A. Direct the product water to a convenient drain. 

B. Ensure a steady feed water supply, turn on the system pump and let the system 

run for four hours. This will flush residual bisulfite solution and any particulate 

impurities from the membranes, housings and plumbing of the system. 

C. Product quality will increase slowly for 1 hour. Monitor the inlet quality vs. the 

product quality by observing the conductivity meter outputs. 

NOTE: The system should have better than 90% rejection within 2 hours as the 

membranes equilibrate. If the product quality does not improve, refer to 

section 5.0 Troubleshooting. 

D. After flushing product to drain for a minimum four hours, turn off the system and 

reconnect the product line. The system is now ready to be put into a normal 

operating mode. Refer to the Product Description/Equipment Specifications in 

the Appendix for design flowrates and pressures. 

3.4 NORMAL OPERATIONS 

The following procedure is for operating a USFilter Reverse Osmosis System that has 

been installed and initial flushing has been completed. Refer to the MC10 Controller 

manual in the Appendix for detailed instructions. 

Use this section for daily startup or to restart the system after a short-term shutdown. 

A. BEFORE starting the RO unit, verify that the following conditions exist: 

DEVICE CONDITION 

Pump discharge throttling valve 1/4 to ½ OPEN 

Reject throttling valve ¼ to ½ open 

Reject recirc throttling valve 1/8 to 1/4 OPEN 

Any valves in the reject to drain line OPEN 

Any valves in the process supply line OPEN 

Pre treatment equipment ready for use 

3-2 USFilter


Storage tank (if applicable) ready for use 

IF ALL THE ABOVE CONDITIONS EXIST, THE SYSTEM IS READY TO 

START. IF ONE OF THE SETTINGS IS INCORRECT, CORRECT THE 

SETTING PRIOR TO PROCEEDING. 

B. Verify the Controller is set to the proper operating mode, either TANK FEED or 

DIRECT FEED as described in the MC10 RO Controller manual in the Appendix. 

C. Press the SYSTEM START button on the Controller. This will start the system. 

The inlet solenoid valve will open then the pump will start after a 15 second 

delay. 

D. Verify that the product, reject, and reject recirculation flows are correct. If not, 

adjust the pump discharge throttling valve and the reject and reject recirculation 

valves. Refer to the Product Description/Equipment Specifications in the 

Appendix for design flowrates and pressures. Adjustment procedure: 

First, adjust the unit to make the correct amount of RO product water by 

adjusting the system pressure. This can be accomplished by regulating the 

pump discharge throttling valve. Further open the valve to increase the system 

operating pressure and productivity, further close the valve to reduce the system 

operating pressure and productivity. 

Second, adjust the unit to make the correct amount of reject to drain flow by 

adjusting the reject throttling valve. Open the valve to obtain a higher flow rate or 

close the valve to reduce the flow rate. 

Third, adjust the unit to make the correct amount of reject recirculation flow by 

adjusting the reject recirculation throttling valve. Further open the valve to obtain 

a higher flow rate or close the valve to reduce the flow rate. 

NOTE: This is somewhat of a "balancing act", in that as you close the reject valves, the 

product flow increases and the reject flow decreases. As you open the pump 

discharge-throttling valve, the product and the reject flows increase. You may 

have to adjust the pump discharge-throttling valve to reestablish the operating 

pressure to obtain the correct product flow as established in the first step. 

E. Once the RO unit is operating at the parameters outlined in this manual, record 

the operating parameters on the “RO Data Collection Form” as described in 

Section 4.4, and found in the Appendix. It is imperative to record the operating 

parameters daily, since RO trouble shooting may require a trended analysis of 

the RO operating parameters. 

NOTE: If the RO will not start, or can not achieve the correct flows, go to the trouble 

shooting section for more information. 

USFilter 3-3

OPERATING INSTRUCTIONS LC Manual 11/02 Rev. 3 

3.5 SHUTDOWN (LESS THAN 4 DAYS) 

CAUTION 

If the shutdown is due to a malfunction, be sure to disconnect the 

electrical power and turn off the water supply before making repairs or 

replacements. 

If the system is not to be operated for up to 4 days, the system should be placed in the 

STANDBY mode. When in this mode the RO system cycles on and off continuously for 

a user settable duration at a user settable interval until the mode of operation is changed 

again. This mode will allow the system to return to normal (TANK or DIRECT FEED 

mode) operation at any time with no adverse affects on the water quality or RO 

membranes. 

3.6 LONG TERM SHUTDOWN PROCEDURE 

CAUTION 

CAUTION 

If the system is to be down for a period longer than 4 days, it is recommended that a 

biocide be pumped into the membrane elements to prevent biological growth. 

Failure to store the membranes in a biocide for long term shutdown 

can cause irreversible damage to the membranes due to bacterial 

growth. 

The solution USFilter recommends is a 0.5 to 1.0% solution of sodium bisulfite. For 

conditions where freezing may be a problem, the solution should also contain up to 18% 

(by weight) glycerin or propylene glycol. Refer to RO membrane data sheet in Appendix 

for further information. 

The following equipment and materials are needed: 

CIP Cleaning Skid 

RO Product Water or DI Water 

Sodium Bisulfite (food grade) 

Propylene Glycol or Glycerin (if required) 

Safety Equipment 

A. Fill the tank on the cleaning skid with the appropriate quantity of RO product 

water or DI water. 

Do not use a solution of greater than 1.0% bisulfite. The pressure 

vessel endcaps will be damaged otherwise. 

B. Add the correct amount of sodium bisulfite powder to the cleaning tank using the 

following proportions: 

0.5% solution sodium bisulfite - .042 lbs. per gallon 

1.0% solution sodium bisulfite - .084 lbs. per gallon 

If applicable, add the appropriate amount of freeze protection (glycerin or 

propylene glycol) to the solution at this point. 

3-4 USFilter


C. Once the bisulfite solution is thoroughly mixed, allow the solution to circulate 

through the RO unit for 30 minutes. 

D. Fully close the manual feed water isolation valve and install a Lock-Out device 

and a Lock Out Tag on the valve. 

E. If applicable, you may also have to fully close any process valves located in the 

RO unit product line down stream of the product line to prevent unwanted RO 

product water from passing this point, and install a Lock-Out device and a Lock 

Out Tag on the valve. 

F. Drain the pump and manifold piping. 

G. Seal all openings to prevent the membrane elements from drying out. 

H. Tag the RO unit with the date and type of solution the membranes are stored in 

so that it is properly flushed prior to being put back into service. 

The RO unit is now ready to be stored. Be sure to follow the Initial Startup in 

Section 3.2 when ready to put the unit back in service. 

USFilter 3-5

LC Manual 11/02 Rev. 3 SYSTEM MAINTENANCE 

4.1 GENERAL 

4.0 SYSTEM MAINTENANCE 

Routine customer maintenance procedures consist of daily checks of the system to 

record operating data, periodic replacement of the prefilter cartridge and sanitization and 

cleaning of the RO membranes. The prefilter cartridge should be changed monthly or 

when the differential pressure reaches 10-15 psig, whichever comes first. Sanitization is 

recommended every four to eight weeks or longer, depending on the application. The 

RO membranes should be cleaned when the normalized product flow rate drops by 

more than 15% or the salt rejection drops by more than 3%. In addition, the system's 

external surface should be kept clean by occasionally wiping down all surfaces with a 

dust-free cloth and visually checking for cracked glass on gauges, loose fittings, and 

broken or missing hardware. 

Whenever the prefilter cartridge or RO membranes are replaced, inspect the 

serviceability of the o-ring seals prior to assembly. Inspect o-rings for signs of 

deterioration or cracking, and replace as required. It helps to lubricate o-rings with 

glycerin before re-assembly. 

4.2 SANITIZING THE REVERSE OSMOSIS SYSTEM 

CAUTION 

Chlorine is not compatible with thin film composite RO 

membranes, and must not be used to sanitize them. 

Periodically, the RO System may require sanitization in order to maintain the 

performance of the RO membranes, and to ensure a low bacterial count in the product 

water. How frequently the system is sanitized depends on the quality of the water 

needed for your particular application. Monitor bacterial levels in the feed and permeate 

as needed. When bacterial levels increase above an acceptable level for the 

application, sanitize the system. 

The choice of the sanitizing agent depends on its compatibility with the polyamide thin 

film composite RO membranes and system components, and the agent’s effectiveness 

as a sanitant. The most commonly used sanitants are hydrogen peroxide and peracetic 

acid. Formaldehyde can also be used as a sanitant however it is rarely used due to 

stringent OSHA exposure limits. 

A. Different Sanitizing Agents 

1. Peracetic Acid (Preferred Method) 

Advantages of using peracetic acid are that it has no toxic vapors, is 

biodegradable, easily disposable, and has good biocidal activity. 

Because of these qualities, operators can be assured that they are not 

handling toxic materials. Peracetic acid decomposes into oxygen, water, 

and acetic acid, which do not harm the environment. Several peracetic 

acid solutions are commercially available, including; Minncare and 

Renalin Dialyzer Reprocessing Concentrate, both products of Minntech 

Corporation, and P3-Oxonia Active, a product of Henkel Corporation. For 

ordering information call the number provided on the cover of this manual. 

USFilter 4-1

SYSTEM MAINTENANCE LC Manual 11/02 Rev. 3 

2. Hydrogen Peroxide 

Advantages of using hydrogen peroxide are that it has no toxic vapors, is 

biodegradable, is easily disposable, has good biocidal activity, and breaks 

down into oxygen and water, which does not harm the environment. 

Because of these qualities, operators can be assured that they are not 

handling toxic materials. 

3. Formaldehyde 

Formaldehyde is one of the most effective agents used for sanitization. It 

is compatible with most materials, is highly active as a biocide over a 

relatively wide pH range, and easily penetrates the RO membrane, thus 

ensuring that the downstream side of the filter is sanitized. But, 

formaldehyde is difficult to flush from the system after sanitization, has an 

objectionable odor, and causes irritation to the eyes and nasal passages. 

In addition, formaldehyde is a suspected carcinogen. Formaldehyde, in 

solution, is purchased as formalin, which is a 37% solution of the 

formaldehyde gas stabilized with methanol. 

CAUTION When using formaldehyde to sanitize thin film composite RO 

membranes, the membranes must have been in use for 24 hours 

prior to sanitization, or a severe loss in flow rate may occur. 

B. Selecting a Sanitant 

Table 4-1 lists the type and concentration of sanitizing agent that should be used 

for polyamide thin film composite membranes, as well as the minimum contact 

time for sanitization. 

Table 4-1: Sanitization Times and Concentrations for Polyamide Thin Film Composite 

Membranes. 

Sanitant Sanitant Concentration Sanitant Contact Time 

Peracetic Acid * up to 400 ppm (0.04%) 60-120 minutes 

Hydrogen Peroxide * up to 2,000 ppm (0.2%) 60-120 minutes 

Formaldehyde ** 2-3% 30 minutes minimum 

* When using hydrogen peroxide or peracetic acid with thin film composite membranes, the 

temperature should not exceed 25° C (77° F). Also, the presence of iron or heavy metals 

can cause membrane degradation. Clean the membranes first if iron is present in the 

feed water. 

** When using formaldehyde to sanitize thin film composite membranes, the membranes 

must have been in use for 24 hours prior to sanitization. 

4-2 USFilter


C. Testing for Residual Sanitant 

After flushing the sanitant from the RO system, the product water should be 

checked for residual levels of sanitizing agent before the system is placed back 

on line. Use the following guidelines to determine if the system is clear of 

residual sanitizing agents. 

1. Peracetic Acid 

The product water should be analyzed with the Peracetic Acid Residual 

Test Strip or other peracetic acid test kit. For ordering information call the 

number provided on the cover of this manual. 

2. Hydrogen Peroxide 

The product water should be analyzed with a hydrogen peroxide test kit. 

3. Formaldehyde 

The product water should be analyzed with a formaldehyde test kit until 

detection limits are reached. 

D. Methods of Sanitization 

Sanitization is most effective when the RO system is operating at normal 

pressure and flows. This allows the maximum amount of sanitant to penetrate 

through the membrane, ensuring adequate sanitization of the product side of the 

system. In addition, sanitant should contact all wetted components of the RO 

system including prefilter housing, valves, flowmeters, and sample ports to 

ensure maximum effectiveness. Three methods of sanitization may be used: 

Recirculation, Continuous Injection and Static Soak. 

1. Recirculation Method 

This method requires an accessory tank and booster pump. A sanitant 

solution is prepared in the tank and fed to the RO system via the booster 

pump. The product and reject streams are diverted to the tank and the 

sanitant is recirculated through the system for a period of time. 

The advantages of the recirculation method of sanitization are minimal 

usage of chemical, and ease in obtaining the proper sanitant 

concentration. In addition, the accessory tank and booster pump may 

also be used for system cleaning. 

The following steps provide a general guideline for the recirculation 

method of sanitization. 

a. A batch of sanitant, typically 10 to 20 gallons (40 to 80 liters) for 

the LC series RO systems is prepared in the tank by diluting the 

sanitization chemical with water. 

b. The product and reject lines are diverted to the tank. Do not use 

the cleaning ports on the RO system to make these connections. 

USFilter 4-3


It is important that the sanitization chemical contact all the piping 

within the RO system 

c. The outlet of the booster pump is connected to the feed of the RO 

system. This connection should be made prior to the prefilter 

housing. 

d. The booster pump is turned on and the RO is run in the normal 

operating mode for 30 to 60 minutes. 

CAUTION Monitor the solution temperature during recirculation. Do not 

allow the temperature to exceed 25° C (77° F). 

e. The booster pump and the RO system are shut down and the 

sanitant is allowed to sit in the system (optional). 

f. The RO is switched back to the normal feed source and run in the 

normal operating mode with the product diverted to drain until all 

residual sanitization chemicals are flushed from the system. 

g. The tank and booster pump are drained and flushed with clean 

water. 

h. A new prefilter is installed in the system prefilter housing. 

2. Continuous Injection Method 

In this method of sanitization, an accessory chemical feed system injects 

concentrated sanitant into the feed line while the RO is operating at 

normal flow and pressure. Both the product and reject streams are sent 

directly to drain. 

The continuous injection method is most typically used to sanitize with 

hydrogen peroxide. It may be used with peracetic acid if an appropriately 

sized chemical feed system is available for the typical 1:100 dilution ratio. 

It is not practical for formaldehyde sanitization because the dilution ratio 

used for formaldehyde (1:10 to 1:20) would require the use of a large 

chemical feed pump. The advantages of the continuous injection method 

are minimal chemical handling and minimal dead legs in the system 

piping. One disadvantage is the relatively high chemical consumption. 

The basic steps for continuous injection sanitization are as follows: 

a. An accessory chemical feed system is connected to the feed 

piping of the system, typically at the system inlet sample valve. 

b. Reject and product lines from the RO are diverted to drain. Do not 

use the cleaning ports on the RO system to make these 

connections. It is important that the sanitization chemical contact 

all the piping within the RO system. 

c. The system is operated at normal flow and pressure. 

4-4 USFilter


d. The chemical feed system is turned on to inject concentrated 

sanitant into the feed water. The sanitant is diluted by the feed 

water to the recommended concentration. 

e. The system is left running for 30 to 60 minutes. 

f. The chemical feed pump and the RO system are shut down, and 

the sanitant solution is allowed to sit in the system (optional). 

g. The chemical feed system is disconnected and the RO is operated 

with product diverted to drain until all residual sanitization 

chemicals are flushed from the system. 

h. A new prefilter is installed in the system prefilter housing. 

3. Static Soak Method 

This sanitization method may be used in combination with either 

recirculation or continuous injection sanitization for heavily bio-fouled 

systems. In this method, sanitant is introduced into the system and then 

the system is shut down. The membranes are allowed to soak in the 

sanitant solution for a period of time ranging from as little as 30 minutes 

up to several days (check with USFilter, Technical Support Department at 

the number provided on the cover of this manual for recommended 

maximum soak time). 

4.3 CLEANING THE RO MEMBRANES 

A. General Information 

This section includes general guidelines for developing a cleaning procedure for 

your particular application. When RO systems have adequate pretreatment and 

are properly operated, they do not require frequent cleaning. In time, however, 

the RO membranes can become fouled to a point where system performance is 

adversely affected, resulting in diminished product output or salt rejection. When 

the normalized product flow rate drops by 15% and/or the salt passage rises 

noticeably, this may indicate fouling of the RO membranes and a need for 

cleaning. However, other factors such as temperature decreases, or 

malfunctioning pretreatment systems, pressure controls and pumps may also 

cause these conditions. It is important to rule out these factors before cleaning 

the system. 

Clean the membranes if the system performance (based on flow rate or salt 

rejection) decreases because of membrane fouling. A 15% increase in the feed 

to reject differential pressure also indicates that cleaning is needed. 

Membrane foulants include colloidal materials such as aluminum and silica 

compounds precipitated metal hydroxides of iron and manganese, biological 

films, and calcium or magnesium carbonate scale. The type of cleaning solution 

(See Table 4-2) depends on the type of foulant present (organic compounds, 

metal hydroxides, Ca/Mg carbonates, etc.). The need for frequent cleaning 

(once a month or more), may indicate that pretreatment is inadequate. 

USFilter 4-5


B. Factors to Consider when Cleaning RO Membranes 

1. Cleaning skid required. 

An accessory cleaning skid consisting of a tank and recirculation pump is 

required to effectively clean the system. The tank and pump should be of 

materials compatible with the cleaning chemicals. Plastic tanks and sealless 

(magnetic drive) plastic pumps are recommended. A tank capacity 

of 10-20 gallons is sufficient for the LC series RO systems. 

2. Use RO product water for cleaning and rinse solutions. 

Use RO product water to prepare cleaning solutions, and as flush water 

between each cleaning step. If RO product water is not available, use 

softened filtered tap water. Completely flush the system between 

applications of different cleaning solutions. 

3. Increase flow rates and decrease pressure. 

During cleaning, reject flow rates should be as high as possible without 

exceeding the maximum design flow of the system. The flow rate should 

be 3 - 5 gpm per vessel for the LC series RO systems during cleaning. 

Pressure should be kept at a minimum during cleaning. Transmembrane 

pressure keeps foulants within or on the membrane surface during 

cleaning. The RO pump should be off during cleaning. 

4. Optimum temperature during cleaning: 

The RO membrane cleaning solutions should be maintained at an 

elevated temperature if possible. Cold water reduces the effectiveness of 

the cleaning solution. Do not exceed the following temperatures during 

cleaning: 

pH Range Maximum Cleaning Temperature 

2-10 50°C (122°F) 

1-11 35°C (95°F) 

1-12 30°C (86°F) 

4-6 USFilter


C. Cleaning Instructions 

CAUTION 

1. Connect the RO system cleaning port (CP) connections to the accessory 

cleaning skid. Flexible hose and tubing work best to connect the 

cleaning equipment with the system. The materials of construction of the 

valves and hose must be compatible with the cleaning solutions. Verify 

that all piping connections are secure. 

2. Mix the desired cleaning solution in the tank and warm to appropriate 

cleaning temperature. 

3. Pump the mixed cleaning solution into the RO system at low pressure at 

a flow rate of 3-5 gpm per vessel. The pressure should be low enough 

that essentially no permeate is produced. 

4. Recirculate the cleaning solution through the RO system for 10 – 15 

minutes. 

5. Turn off the cleaning pump and allow the RO membranes to soak in the 

cleaning solution. The soak period may range from 1 hour to overnight, 

depending on how severely fouled the membranes are. Turn on the 

cleaning pump periodically to circulate the cleaning solution. If the 

cleaning solution becomes highly discolored during recirculation, discard 

it and repeat the application. 

6. Recirculate the cleaning solution at 3-5 gpm per vessel for 30-60 minutes. 

This high flow rate flushes out foulants removed from the RO 

membranes. 

If the system temperature approaches the maximum recommended 

operation temperature during recirculation, shut down the system 

and allow it to cool off before continuing the recirculation. 

7. Disconnect the RO system from the cleaning skid. Divert the product and 

reject lines to drain. 

8. Flush the cleaning solution from the system, starting with a 10 to 15 

minute manual flush cycle. Then place the system in the normal 

operating mode, and for the first ten minutes, reduce the feed pressure to 

approximately half of the normal operating pressure by opening the reject 

and reject recycle throttle valves. This prevents residual foulants from 

being impacted into the membrane. After ten minutes, return the system 

to normal operating pressure, and continue flushing until the product 

water is clear of all residual cleaning agents. To test for residual cleaning 

agents when using an acid or base, the pH of the product water would be 

equal to, or nearly equal to, the pH of the feed water. For other 

chemicals, the conductivity of the product should be equal to, or less 

than, the conductivity of the product before cleaning. 

USFilter 4-7


Table 4-2: Cleaning Solutions for Polyamide Thin Film Composite Membranes. 

0.1% (W) 1 

NaOH and pH12, 30°C 

max. 

or 1.0% (W) Na4EDTA 

and pH12, 30°C max. 

0.1% (W) 1 

NaOH and pH12, 30°C 

max. 

or 0.025% (W) NaDSS 

and pH12, 30°C max. 

0.1% STP 

and 1.0% (W) 1 Na4EDTA 

or 1.0% TSP and 

pH12, 30°C max. 

Inorganic 

Salts 2 

Metal 

Oxides 

(Iron) 

0.2% (W) 1 HCl BEST 

0.5% (W) 1 H3PO4 OK GOOD 

2.0% (W) 1 Citric Acid OK 

1.0% (W) 1 Na2S2O4 

GOOD 

NOTES: 

1. (W) Denotes weight percent of active ingredient. 

Inorganic 

Colloids 

(Silt) 

Silica Biofilms Organics 

OK BEST OK 

GOOD GOOD GOOD 

GOOD GOOD 

2. Inorganic Salts: CaCO3=Calcium Carbonate; CaSO4=Calcium Sulfate; BaSO4=Barium 

Sulfate. 

3. Cleaning chemical symbols: NaOH=Sodium Hydroxide; Na4EDTA is the Tetrasodium Salt of 

Ethyl Diamine Tetraacetic acid; NaDSS is Sodium Salt of Dodecylsulfate; STP is Sodium 

Triphosphate (Na5P3O10); TSP is Trisodium Phosphate (Na3PO4·12H2O); HCl is Hydrochloric 

Acid; H3PO4 is Phosphoric Acid; C3H4(OH)(CO2H)3 is Citric Acid; Na2S2O4 is Sodium 

Hydrosulfite. 

4.4 MAINTENANCE SCHEDULE 

NOTE: The maintenance schedule for monitoring outlined is a minimum for the 

protection of the RO system. A more frequent monitoring schedule may be 

necessary. Consult your local U.S. Filter representative or call U.S. Filter, 

Technical Service Department at the number provided on the cover of this 

manual for assistance. 

Refer to the RO Data Collection Form in the Appendix. 

4-8 USFilter


A. Feed water 

1. Check pressure daily; record weekly. Adjust as necessary to maintain 15 

to 50 psig (minimum 25 psig recommended). 

2. Monitor feed and product conductivity and record weekly. 

3. If there is a possibility of the presence of chlorine in the feed water, 

measure free chlorine weekly. (It must be non-detectable or the 

membranes may be damaged). 

4. If there is a possibility of significant pH variations (i.e. the feed is pH 

controlled) monitor and record pH weekly by independent pH meter or 

litmus paper. 

5. Measure total hardness monthly. 

6. Measure total alkalinity monthly. 

B. Prefilter 

C. Pump 

1. Measure differential pressure daily; record weekly. 

2. Change prefilter cartridge when the differential pressure is greater than 

10 psi or every month, whichever occurs sooner. 

1. Check pressures daily; record weekly. 

2. If the pressures have fallen off, check product, reject and reject 

recirculation flow rates. 

D. Conductivity 

1. Observe feed and product conductivity daily; and record weekly. 

2. Record percent salt rejection weekly. 

Conductivity Feed - Conductivity Product 

100 X = % Rejection 

Conductivity Feed 

E. Flow Rates 

1. Check daily and record product and reject flow rate weekly. 

2. Calculate the percent recovery using the following formula: 

Product Flow Rate 

100 X = % Recovery 

Product Flow Rate + Reject Flow Rate 

The percent recovery should not exceed the design value shown on the 

Equipment Specifications sheet in the Appendix. If minimizing water usage is 

critical, the percent recovery should be maintained near, but not above the 

maximum value. Operating with too high a percent recovery will lead to 

premature fouling of the membrane. 

USFilter 4-9


F. Bacteria 

1. For critical applications, such as dialysis and pharmaceuticals, measure 

the number of bacteria in the product water weekly. Record the results as 

colony forming units per milliliter (CFU/ml). Sanitize as necessary. 

2. For non-critical applications, measure the number of bacteria in the 

product water monthly. Record the results as colony forming units per 

milliliter (CFU/ml). Sanitize as necessary. 

G. If the maintenance log shows steady deterioration in results (product flow, 

percent rejection, etc.) corrective action should be taken. (Described in Section 

5.0 Troubleshooting.) 

4-10 USFilter

LC Manual 11/02 Rev. 3 TROUBLESHOOTING 

5.1 SYSTEM INOPERATIVE 

5.0 TROUBLESHOOTING 

A. Check to see if power to the unit is turned on. 

B. Verify the controller indicates that the system is on, if not press the system start 

button. 

C. Verify that the motor starter relay is engaging, if not reset the overload relay. If 

the overload relay fails to reset, replace the overload relay or contact your 

USFilter representative for further assistance. 

D. Check the motor starter coil for proper operation and replace if necessary. 

E. With a voltmeter check that power is being supplied to the motor. If proper 

voltage is going to the motor but it does not run, replace the motor or contact 

your USFilter representative for further assistance. 

5.2 LOW SYSTEM PRESSURE 

A. If the feed pressure before the prefilter is too low, check for obstruction in 

equipment and piping between feed source and RO unit. 

B. If the feed pressure after the prefilter is below normal, check for high differential 

pressure across the prefilter (plugging), replace the filter cartridge. 

C. If the membrane feed pressure is below normal, verify that the pump is running. 

D. Verify that the reject, reject recycle and product flows are normal. If not, adjust to 

design flow rates using the Equipment Specifications located in the Appendix and 

recheck membrane feed pressure. 

E. If the flows cannot be adjusted to the above flow rates, slowly close the reject 

and reject recirculation valves to observe the maximum pressure to the 

membrane. Do this only briefly and do not completely close the valve. If this 

pressure does not exceed 150 psig, repair or replace the pump/motor. 

5.3 LOW PERCENT RECOVERY 

A. Check product, reject, reject recycle flow rates and feed pressures to be sure 

they are normal; adjust flows as necessary. 

B. If feed to membrane pressure exceeds normal by 10% and product flow is lower 

than normal at a given temperature, the RO membranes are beginning to fail. 

They should be cleaned or replaced. 

5.4 HIGH PERCENT RECOVERY 

A. Verify that the reject, reject recycle and product flows are normal. If not, adjust to 

design flow rates using the Equipment Specifications located in the Appendix. 

B. Set the membrane pressure to 150 psig. 

C. If the product flow is high after adjusting the pressures and flows, the RO 

membrane o-rings may be leaking. Check percent rejection. 

USFilter 5-1

TROUBLESHOOTING LC Manual 11/02 Rev. 3 

5.5 LOW SALT REJECTION 

A. Verify that the feed water temperature has not increased substantially from 

normal. High temperatures can affect percent rejection, as temperature 

increases, percent rejection decreases. 

B. Check product, reject, reject recycle flow rates and feed pressures per the 

Equipment Specifications in the Appendix, and adjust flows/pressures as 

necessary. 

C. Another possibility is high CO2 content in the inlet water. CO2 readily permeates 

the membrane. High CO2 content water will also have a pH of less than 6.0. 

D. RO membrane o-rings may not be seated correctly, check the percent rejection 

for each individual membrane housing. Remove membranes and verify o-rings 

are seated correctly on any that are below 90% rejection. 

E. If the above possibilities are eliminated, RO membranes are beginning to fail. 

They should be cleaned or replaced. 

5.6 SYSTEM KEEPS SHUTTING OFF 

A. Observe the controller indicators to see if they indicate the cause for system 

shutdown, if the controller is shutting the unit down refer to the RO controller 

section of this manual for further discussion. 

B. The motor is equipped with automatic thermal overload protection. If the motor 

gets too hot it will shut down. After it has cooled it will restart. Excessive amp 

draw can cause the motor to get too hot. 

C. If an optional sensor is being used (Tank Level switch(es), Pretreatment 

Interlock), check to verify the sensor is not shutting off the system. 

5.7 SYSTEM SHUTOFF, LOW PRESSURE 

A. Verify that the feed water pressure is above 15 psig. 

B. Check the differential pressure across prefilter(s). It should be less than 10 psig, 

if not replace the prefilter cartridge filter and recheck feed pressure. 

C. Check the pump suction pressure. It should be greater than 15 psig, if not check 

for obstruction in piping between the prefilter and pump suction. 

D. Verify the low pressure switch is operating properly. 

5.8 SYSTEM SHUTOFF, HIGH TEMPERATURE 

A. Check incoming water temperature. 

B. The high temperature shut down is user settable and should activate around 

35°C ± 3°C (95°F ± 5°F). 

C. The temperature thermistor (sensor) is combined in the feed conductivity probe 

circuitry. The probe may be replaced if it is giving an erroneous temperature 

indication. (Refer to the RO Controller manual in the Appendix for correct 

values.) 

5-2 USFilter

LC Manual 11/02 Rev. 3 TROUBLESHOOTING 

5.9 LOW PRODUCT FLOW RATE 

A. Low feed water temperature can substantially reduce the performance of the RO 

unit. 

B. Adjust the reject throttling valve to increase membrane feed pressure, this 

adjustment should increase the product flow rate. Do not exceed 225 psig. 

C. If adjusting the reject throttling valve does not improve product flow rate, the RO 

membranes are fouled and should be cleaned with an appropriate medium. 

Depending on the type of fouling suspected, various regeneration/cleaning 

solutions may be used. Consult your local USFilter representative or USFilter, 

Technical Support Department at the number provided on the cover of this 

manual. 

5.10 MOTOR OVERLOAD SHUTDOWN 

A. Motor overload shutdown is caused by excessive amp draw. An overload relay 

is wired directly to the motor starter and it will shut the system down if it runs 

above the full load amp rating of the motor. Reset the overload relay by pressing 

the “RESET” button on the starter enclosure. If the unit continues to trip the 

overload relay and shutdown contact your local USFilter representative or 

USFilter Technical Support Department at the number provided on the cover of 

this manual. 

B. If the overload is shutting the unit down due to damage or binding within the 

pump/motor, repair or replace the pump/motor or contact your local USFilter 

representative or USFilter Technical Support Department at the number provided 

on the cover of this manual. 

5.11 CONTROLLER MALFUNCTION 

Refer to the RO Controller manual in the Appendix for troubleshooting controller related 

malfunctions. 

USFilter 5-3

LC Manual 11/02 Rev. 3 WARRANTY 

6.1 GENERAL LIMITED WARRANTY 

6.0 WARRANTY 

USFilter warrants the products manufactured by it against defects in materials and 

workmanship when used in accordance with the applicable instructions for a period of one 

year from the date of shipment of the products. USFilter MAKES NO OTHER WARRANTY, 

EXPRESSED OR IMPLIED. THERE IS NO WARRANTY OF MERCHANTABILITY OR 

FITNESS FOR A PARTICULAR PURPOSE. The warranty provided herein and the data, 

specifications and descriptions of USFilter products appearing in USFilter’s published 

catalogs and product literature may not be altered except by express written agreement 

signed by an officer of USFilter. Representations, oral or written, which are inconsistent 

with this warranty or such publications are not authorized and if given, should not be relied 

upon. 

In the event of a breach of the foregoing warranty, USFilter’s sole obligation shall be to 

repair or replace, at its option, any product or part thereof that proves defective in materials 

or workmanship within the warranty period, provided the customer notifies USFilter promptly 

of any such defect. The exclusive remedy provided herein shall not be deemed to have 

failed of its essential purpose so long as USFilter is willing and able to repair or replace any 

nonconforming USFilter product or part. USFilter shall not be liable for consequential 

damages resulting from economic loss or property damages sustained by a customer from 

the use of its products. 

6.2 WATER SYSTEM LIMITED WARRANTY 

USFilter warrants the water systems manufactured by it, BUT EXCLUDING MEMBRANES 

AND CARTRIDGES, against defects in materials and workmanship when used in 

accordance with the applicable instructions and within the operating conditions specified for 

the systems for a period of one year from the earlier of: (i) the date of installation; or (ii) 120 

days following the date of shipment. USFilter MAKES NO OTHER WARRANTY, 

EXPRESSED OR IMPLIED. THERE IS NO WARRANTY OF MERCHANTABILITY OR 

FITNESS FOR A PARTICULAR PURPOSE. The warranty provided herein and the data, 

specifications and descriptions of USFilter systems appearing in USFilter’s published 

catalogs and product literature may not be altered except by express written agreement 

signed by an officer of USFilter. Representations, oral or written, which are inconsistent 

with this warranty or such publications are not authorized and if given, should not be relied 

upon. 

In the event of a breach of the foregoing warranty, USFilter’s sole obligation shall be to 

repair or replace, at its option, any product or part thereof that proves defective in materials 

or workmanship within the warranty period, provided the customer notifies USFilter promptly 

of any such defect. The exclusive remedy provided herein shall not be deemed to have 

failed of its essential purpose so long as USFilter is willing and able to repair or replace any 

nonconforming USFilter system or component part thereof. USFilter shall not be liable for 

consequential damages resulting from economic loss or property damages sustained by 

any customer from the use of its process systems. 

USFilter 6-1

WARRANTY LC Manual 11/02 Rev. 3 

Products or components manufactured by companies other than USFilter or its affiliates 

(“Non-USFilter Products”) are covered by the Warranty, if any, extended by the Product 

manufacturer. USFilter hereby assigns to the purchaser any such warranty: however, USF 

EXPRESSLY DISCLAIMS ANY WARRANTY, WHETHER EXPRESSED OR IMPLIED 

THAT THE NON-USF PRODUCTS ARE MERCHANTABLE OR FIT FOR A PARTICULAR 

PURPOSE. 

6-2 USFilter

APPENDIX LC Manual 11/02 Rev. 3 

7.1 GLOSSARY OF TERMS 

7.0 APPENDIX 

The terms commonly used in reverse osmosis are defined below: 

ANION - Negatively charged ion, such as CO3 -- , SO4 -- , HCO3 -- , Cl - , NO3 - , etc. 

CATION - Positively charged ion, such as Ca ++ , Mg ++ , Fe ++ , Na + , K + , etc. 

CONCENTRATE (REJECT) - Concentrated portion of the feed remaining outside the 

membrane which is discarded. 

CONDUCTIVITY - A measure of salt concentration due to the ability of dissolved solids (ions) to 

conduct electricity, usually expressed as micromhos/cm. 

FEED - The feedwater pumped into a permeator under high-pressure. 

OSMOSIS - Osmosis is the diffusion of a solvent (such as pure water) from a dilute saline 

solution into a more concentrated saline solution through a semipermeable membrane 

separating the two solutions. 

OSMOTIC HEAD - Osmotic head (pressure) is the change in head resulting from water 

transport through the semipermeable membrane separating two saline solutions of different 

concentrations. 

PASSAGE - Ratio of permeate to feed concentration of a particular dissolved material, 

expressed in percent. 

PERMEATE (PRODUCT) - The purified portion of the feed passing through the membrane. 

RECOVERY - Percent of feedwater converted into permeate. 

REVERSE OSMOSIS (RO) - The process by which incoming fluid (feed) is forced under highpressure 

through a reverse osmosis membrane. A portion of the fluid with concentrated ionic 

materials (concentrate) remains upstream of the membrane and is discarded (unless it is of 

interest in a particular application). The highly purified portion (permeate) which passed through 

the membrane would then be collected for use (as in a water purification application). 

REVERSE OSMOSIS (RO) MEMBRANE - An RO membrane is a semipermeable membrane 

generally in sheet or hollow fiber form which rejects not only dissolved materials, but also 

organics, submicron size colloidal materials and bacteria which may contaminate a high purity 

USFilter 7-1

LC Manual 11/02 Rev. 3 APPENDIX 

water system. The process is not absolute and therefore most reverse osmosis membranes are 

defined by their rejection characteristics. 

SOLUTE - Material (salts) dissolved by solvent (water). 

TOTAL DISSOLVED SOLIDS - Total dissolved inorganic salts present in the permeator stream 

7-2 USFilter


7.2 REPLACEMENT/SPARE PARTS LIST – LC MODEL (VROLC0XXX) 

PART NUMBER DESCRIPTION 

FCR0N0905 CARTRIDGE FILTER 5 MICRON 9-3/4” 

09/02027-01 CARTRIDGE FILTER HOUSING, 10” W/ MNT BRACKET 

B10012698 CARTRIDGE BOWL 

ZHA151021 CARTRIDGE O-RING 

15/03939-01 PRESSURE GAUGE 0-100 PSI BTM MNT 

15/03939-03 PRESSURE GAUGE 0-300 PSI PNL MNT 

15/03939-06 PRESSURE GAUGE 0-300 PSI BTM MNT 

49/S0201-120 PVC PUMP DISTRIBUTION BLOCK 

04/03932-01 PUMP 240GPH BRASS 1/2FPT 

ROSTW2540 RO MEMBRANE 

06/30707-02 PRESSURE VESSEL 2.5X40 PVC, 225 PSI 

P92828 ENDCAP 1-PORT (HYDROCOMPONENTS PRT# 2500.2-1) 

P92829 ENDCAP 2-PORT (HYDROCOMPONENTS PRT# 2500.2-2) 

P92830 U-PIN (HYDROCOMPONENTS PRT# 2500.2-4) 

P92831 O-RING 2.5” OD (HYDROCOMPONENTS PRT# 200-330) 

P92832 O-RING 3/4“ ID (HYDROCOMPONENTS PRT# 200-210) 

22/03976-01 LOW PRESSURE SWITCH 

22/03976-02 HIGH PRESSURE SWITCH 

03/03931-03 STARTER (60HZ) 

03/30565-03 STARTER (50HZ) 

03/30049-01 OVERLOAD RELAY FOR STARTER (60HZ) 

03/30558-01 OVERLOAD RELAY FOR STARTER (50HZ) 

05/03904-12 SOLENOID VALVE BRASS 3/4FPT 24V 

05/03904-06 SOLENOID VALVE BRASS 3/8FPT 24V (60HZ) 

05/31953-06 SOLENOID VALVE BRASS 3/8FPT 24V (50HZ) 

18/03951-01 CONDUCTIVITY SENSOR 3/4 MPT 

06/31020-20 BRINE SEAL 

P91141 SAMPLE VALVE 

05/03891-04 NEEDLE VALVE BRASS ¼ FPT 

05/12961-01 CHECK VALVE, 1/2 NPT PVC 

05/03892-04 CHECK VALVE 1/4 MPT 

10/64045-06 NYLON TUBING 3/8 OD 

10/64045-08 NYLON TUBING 1/2 OD 

15/02472-01 PRESSURE REGULATOR 3/4 FPT 

21/03995-02 FLOWMETER 0.5-5 GPM 

21/03995-01 FLOWMETER 0.2-2 GPM 

26/10715-01 LEVELING PAD 

03/03929-01 MC10 CONTROLLER (Without MODEM ASSEMBLY) 

USFilter 7-3


03/03929-03 INTERNAL MODEM ASSEMBLY 

03/03929-04 AQUAGRAPH DATA LOGGING SOFTWARE 

P92833 75 VA TOROIDAL TRANSFORMER (RODI SYSTEMS PRT# 307) 

P92834 ALARM BEEPER (RODI PRT# 404) 

P92835 ALARM BEEPER GASKET (RODI PRT# 419) 

P92836 CONDUCTIVITY SENSOR FITTING, 3/4" NPT (RODI PRT# 249) 

P92837 USF MC10 OPERATING MANUAL (RODI PRT# 491) 

P92838 NETWORK AND EXPANSION PORT CAP (RODI PRT# 124) 

P92839 MULTI-GRIP CORD CONNECTOR (RODI PRT# 7) 

P92840 LOCKNUT FOR CORD CONNECTOR (RODI PRT# 9) 

P92841 MODEM MODULE (RODI PRT# 188) 

P92842 CPU AND I/O BOARDS (RODI PRT# 245) 

P92843 MODEM CARRIER BOARD (RODI PRT# 464) 

7-4 USFilter


7.3 RO DATA COLLECTION FORM 

SYSTEM IDENTIFICATION: ______________________________________ 

WEEK ENDING DATE: __________________________________________ 

See calculated values on next page. 

RO UNIT OPERATING PARAMETERS* S M T W T F S 

RO Cartridge Filter Outlet Pressure (PSI) 

RO Cartridge Filter Inlet Pressure (PSI) 

RO Cartridge Filter Pressure Drop (PSI) 1 

Product Flow Rate (GPM) 

Reject Flow Rate (GPM) 

Feed Flow Rate (GPM) 2 

Reject Recirculation Flow Rate (GPM) 

Product Recovery (%) 3 

Feed Water Temperature ( o F) 

Feed Water pH (0-14) 

Feed Water Chlorine Concentration (PPM) 

Feed Water Total Hardness (PPM as CaCO3) 

Feed Water SiO2 (PPM as SiO2) 

Feed Water Conductivity (µS/cm) 

RO Product Conductivity (µS/cm) 

RO Final Reject Conductivity (µS/cm) 

RO Percent Rejection (%) 4 

RO Pump Discharge Pressure (PSI) 

RO Membrane Feed Pressure (PSI) 

RO Product Pressure (PSI) 

RO Final Reject Operating Pressure (PSI) 

RO Normalized Productivity (GPM) 5 

* If Applicable 

COMMENTS: 

DATA TAKEN BY: 

USFilter 7-5


Calculated Values: 

1: RO FILTER PRESSURE DROP is equal to filter inlet pressure MINUS filter outlet 

pressure. 

2: RO FEED FLOW rate is equal to RO product flow PLUS the RO reject flow. 

3: RO PRODUCT RECOVERY is equal to the RO product flow rate DIVIDED by the RO 

feed flow rate, MULTIPLIED by 100. 

EXAMPLE: Product flow = 3 GPM 

Feed flow = 4 GPM 

(3 ÷ 4) x 100 = 75% recovery 

4: RO PERCENT REJECTION* is equal to the RO feed conductivity MINUS the RO 

product conductivity, DIVIDED by the feed conductivity, TIMES 100. 

EXAMPLE: Feed conductivity = 380 µS/cm 

Product conductivity = 5 µS/cm 

{(380-5) ÷ 380} x 100 = 98.6% rejection 

* The RO Quality monitor is set up at the factory to display this value. 

5: NORMALIZED PRODUCTIVITY is a true indication of membrane performance. It is 

calculated as follows: 

NPF = MPF X TCF X (125÷MFP) 

Where: 

NPF = NORMALIZED PRODUCT FLOW 

MPF = MEASURED PRODUCT FLOW 

TCF = TEMPERATURE CORRECTION FACTOR (See table next page) 

MFP = MEASURED MEMBRANE FEED PRESSURE 

EXAMPLE: MPF = 3.5 GPM 

FEED WATER TEMP = 60 o F, THEN TCF = 1.44 

MFP = 150 PSIG 

NPF = 3.5 x 1.44 x (125÷150) 

NPF = 3.5 x 1.44 x 0.833 

NPF = 4.2 GPM 

7-6 USFilter


RO FEED WATER TEMPERATURE CORRECTION FACTOR 

TEMP o F TCF TEMP o F TCF 

34 3.64 70 1.12 

36 3.18 72 1.08 

38 2.93 74 1.05 

40 2.68 76 1.02 

42 2.47 78 0.97 

44 2.29 80 0.93 

46 2.14 82 0.90 

48 2.01 84 0.88 

50 1.88 86 0.86 

52 1.77 88 0.82 

54 1.68 90 0.79 

56 1.59 92 0.77 

58 1.51 94 0.75 

60 1.44 96 0.73 

62 1.36 98 0.70 

64 1.30 100 0.68 

66 1.24 102 0.65 

68 1.17 104 0.63 

USFilter 7-7


7.4 QA DATA REPORT 

See QA Data Report that follows this page. 

7-8 USFilter


7.5 DRAWINGS 

Only the drawings checked below that apply to your system will be included in this section. 

Dwg/Doc # Model Description 

SV301-LC.doc All LC-Models Product Description/Equipment Specifications – LC Model 

SV301-001 VROLC01XX P&ID, 1 Vessel – LC Model 




SV301-210 VROLC01XX General Arrangement Drawing, 1 Vessel – LC Model 




SV301-050 VROLCXXAX Electrical Schematic, 120/240V/1Ph/60Hz, LC Model 

SV301-051 VROLCXXBX Electrical Schematic, 208V/3Ph/60Hz, LC Model 

SV301-052 VROLCXXCX Electrical Schematic, 230V/3Ph/60Hz, LC Model 

SV301-053 VROLCXXDX Electrical Schematic, 460V/3Ph/60Hz, LC Model 

SV301-054 VROLCXXEX Electrical Schematic, 380V/3Ph/50Hz, LC Model 

SV301-055 VROLCXXFX Electrical Schematic, 575V/3Ph/60Hz, LC Model 

SV301-056 VROLCXXGX Electrical Schematic, 220V/3Ph/50Hz, LC Model 

USFilter 7-9


7.6 COMPONENT MANUFACTURER LITERATURE 

Only the literature checked below that applies to your system will be included in this section. 

Component Manufacturer Model Number Vantage Model 

Pump Procon 104E240F11XX All LC-Models 

Membrane Filmtec TW30-2540 All LC-Models 

Controller RODI Systems MC10 All LC-Models 

Software RODI Systems Aquagraph VROLCXXXM 

7-10 USFilter

Product Description/Equipment Specifications 

Vantage Series Reverse Osmosis Units 

Model LC 

Process Water Systems 

General Description 

USFilter’s Vantage Series model LC Reverse Osmosis units are designed and 

manufactured for commercial applications. Each LC model consists of a single 

stage centrifugal pump and tap water low pressure membranes. They are preengineered, 

pre-assembled units that minimize installation and start-up costs. 

They are fully tested at the factory and only require simple utility connections 

(feed water inlet, product water outlet, drains and power). They arrive with 

membranes installed and are ready for immediate on-line service with minimal 

set up and adjustments. Their simple designs maximize reliability of the Reverse 

Osmosis unit. An optional modem is available for remote operation and 

monitoring to tailor the Vantage Series Reverse Osmosis equipment for specific 

customer requirements. 

Each unit is a single pass RO system mounted on a polyurethane coated 

structural steel frame. The RO unit includes a high pressure feed pump, PVC 

end entry pressure vessels, and spiral wound thin film composite RO 

membranes. Each RO unit also includes PVC low pressure piping, high pressure 

brass fittings and nylon tube and fittings, polyethylene tube and fittings for low 

pressure reject, reject recycle and product piping, and a system controller. 

Mechanical Description 

The major components are supported by the frame and designed in such a way 

to provide easy access for servicing, maintenance, and monitoring system 

performance. The frame is an open style full frame configuration designed to 

provide maximum support and protection for the RO unit’s components and allow 

access for maintenance and operation. 

The feed piping is schedule 80 PVC. The low pressure reject, product and low 

pressure reject recycle is Polyethylene tubing. The high pressure manifold is 

constructed of threaded brass fittings and Nylon tubing and fittings. The inlet 

piping connection is female pipe thread PVC fittings. The product outlet, reject 

and autoflush connections are quick connect tube style. All high pressure valves, 

reject throttling and reject recycle throttling needle valves are brass. Sample 

valves are provided for the RO unit’s feed and product lines. An individual 

sample valve is also located on the product line of each pressure vessel for 

analyzing individual vessel performance. Cleaning connections are provided to 

clean the RO membranes and pressure vessels. All of the cleaning connections 

are quick connect tube fittings. 

SV301-LC_rev2.doc Page 1 Rev. 2, 10 Oct 2001


Electrical Description 

To control the operational sequences of the Reverse Osmosis unit, a highly 

reliable solid-state programmable controller is employed that monitors and 

protects the system from damage to itself or nearby equipment, systems and/or 

personnel. The motor starter and controller are housed in moisture and corrosion 

resistant NEMA 4X enclosures. A single power drop to the starter enclosure is 

utilized to power the unit. 

Operational Description 

Vantage Series LC model Reverse Osmosis units offers three modes of 

operation; Tank Feed, Direct Feed and Standby. While in Tank Feed mode, the 

filtered water is delivered to a downstream storage device until the water level 

has reached a setpoint value at which point the Reverse Osmosis unit shuts 

down. While in Direct Feed mode, the Reverse Osmosis unit delivers filtered 

water on a continuous basis and only shuts down if there is an alarm condition 

internal to the unit itself. While in Standby mode, the Reverse Osmosis unit will 

be rinsed at the service flow rate for up to 6 minutes at a user settable interval to 

reduce the possibility of biological fouling. 

Product Offering Overview 

Part Number Product Flow Rate** 

LC01 0.4 GPM 

LC02 0.8 GPM 

LC03 1.2 GPM 

LC04 1.6 GPM 

**Product flow rates are based on 22 GFD flux rates for well water. These 

product flow rates may not be appropriate for other feed waters. Warmer or 

colder water or use of different membrane elements may require a different 

pump. An Applications Specialist can re-rate the units for other feed water 

conditions. 

Design Parameters 

Configuration Multi-Stage, Single Pass 

Inlet Pressure Requirements 25-50 PSIG 

Feed Water Temperature 25°C (77°F) 

Feed Water Source Well or Softened 

Prefiltration Requirements 5 µ nominal 

Feed Water Fouling Index Silt Density Index (SDI) < 3 

System Recovery (Nominal) 50% 

Product Pressure Available 25 PSIG 

Membrane Salt Rejection 99% nominal 

(based on 2000ppm NaCl @ 225 PSI, 77 

degrees F, pH 8, and 15% recovery) 

Performance Basis A specific computer projection must be run for 

each individual application 



General Specifications 

Frame: 

Materials Welded structural carbon steel and clamp type strut 

Paint Polyurethane coated, textured finish 

Color USF White 

Pump: 

Manufacturer Procon 

Model 104E240F11XX 

Materials Brass 

Connection Type FNPT 

Pump Motor: 

Type ODP, close coupled 

RPM@60Hz 1750 RPM 

Membranes: 

Manufacturer Filmtec 

Model TW30-2540 

Materials Thin Film Composite (TFC) 

Type Spiral Wound 

Pressure Vessels: 

Manufacturer Hydrocomponents 

Model 2540.2 

Materials PVC 

Rating 225 PSIG Non-ASME code stamped 

Process Connections End entry, feed/concentrate FNPT 

Piping Systems: 

Low Pressure Feed, Schedule 80 PVC and polyethylene tube 

Reject and Recycle 

Product Polyethylene tube 

High Pressure Reject Brass 

and Recycle 

Automatic Process 

Valves: 

1.5” and smaller Solenoid, spring assist closed 

Manual Valves: 

Feedwater Sample ¼” PVC ball valve 

Product Water Sample ¼” PVC ball valve 

Reject throttling Manual, needle type, brass, 

Recycle throttling Manual, needle type, brass 



Instrumentation Specifications 

Pressure: 

Membrane feed 2” dial, liquid filled, brass 

Filter inlet 2” dial, liquid filled, brass 

Filter discharge 2” dial, liquid filled, brass 

Reject 2” dial, liquid filled, brass 

Low Feed Pressure United Electric, 4-50psi, Brass, ¼” MNPT, 24VDC 

Switch 

High Pump Discharge 

Switch 

United Electric, 30-600psi, Brass, ¼” MNPT, 24VDC 

Conductivity: 

Feed Sensor RODI, 1.0 constant, ¾” MNPT, Epoxy, temperature 

compensated 

Product Sensor RODI, 1.0 constant, ¾” MNPT, Epoxy, temperature 

compensated 

Monitor RODI, built into microprocessor/controller 

Flow: 

Product Flow Indicator Blue White 400N series, PVC/acrylic construction,1/2” 

FPT connections 

Reject Flow Indicator Blue White 400N series, PVC/acrylic construction,1/2” 


Recycle Flow Indicator Blue White 400N series, PVC/acrylic construction,1/2” 


Controls Specifications 

Motor starter NEMA 4X 

Controller RODI Systems; Microprocessor-Controlled, UL/CUL 

Listed 

input/output Discrete 12 point (8 input and 4 output) 

Warning alarms Low product quality 

High Pressure Pump Discharge 

Low feed pressure 

High feed/product water temperature 

Shutdown alarms Low product quality 




Pretreatment out of service 

Chemical Feed out of service 

Motor Overload 

Storage Tank Full (non-alarming start and stop 

condition) 

Status indicator lights Low product quality 






Pretreatment out of service 

Chemical Feed out of service 

Motor Overload 

Storage Tank Full 

Miscellaneous controls Elapsed run time indicator 

Audible Alarm 

Serial data port 

Optional modem 

Auxiliary contacts – two sets (1 amp maximum) 

Interface Communication Specifications 

Pretreatment system - 

out of service 

24VAC discrete input - Note: Activation of this signal 

confirms that the pretreatment equipment is available 

to deliver water to the RO unit. (Dry contacts) 

Call-for-water signal 24VAC discrete input - Note: Activation of this signal 

confirms that the Chemical Feed equipment is 

available to deliver water to the RO unit. (Dry 

contacts) 

Operating Parameters* 

Temperature: 

Maximum Feed Temperature 113°F 

Minimum Feed Temperature* 50°F 

*Lower temperature may require larger booster pump 

Pressure: 

Maximum System Inlet Pressure 50 PSIG 

Minimum System Inlet Pressure 15 PSIG 

Design Membrane Feed Pressure (@77°F) 150 PSIG (Nominal) 

*If any of the operating conditions are not within the limits given, consult the 

factory for application assistance. 

Feed Water Requirements* 

Parameter: 

Maximum SDI Rating 3 

Maximum Turbidity 1 NTU 

Maximum Free Chlorine and/or chloramine


Regulations and Standards 

Quality System ISO 9001 certified by the British Standards Institute (BSI) 

Frame Welding Plant standard 

Electrical National Electrical Code (NEC), NEMA 

Seismic Rating None 

Piping Unit is fully tested for normal operation and conditions 

Documentation Package 

Documents Installation procedures, start-up procedures, operation 

procedures, functional description, flow rate chart, 

specifications, Spare parts list, Technical Service and 

Support services 

Drawings Process and Instrumentation (P&ID), General Arrangement 

Quality 

Documents 

(GA) and electrical schematics 

Quality Assurance data reports 

System Production Flow Rate Specifications, gpm 

Model Number LC01 LC02 LC03 LC04 

Feed 0.8 1.6 2.4 3.2 

Product (maximum) 0.4 0.8 1.2 1.6 

Reject 0.4 0.8 1.2 1.6 

Reject Recycle 3.1 2.3 1.5 0.7 

Skid Process Connection Specifications 


Feed Inlet ¾” FNPT ¾” FNPT ¾” FNPT ¾” FNPT 

Product Outlet ½” tube ½” tube ½” tube ½” tube 

Reject to Drain 

Outlet 

3/8” tube 3/8” tube 3/8” tube 3/8” tube 

Unit Configuration Specifications 


Vessel array staging 1 1:1 1:1:1 1:1:1:1 

Membranes / vessel 1 1 1 1 

Membrane quantity 1 2 3 4 

Vessel quantity 1 2 3 4 

Pump model 112E240F11 112E240F11 112E240F11 112E240F11 



Skid Cleaning Connection Specifications 


Feed ¾” FNPT ¾” FNPT ¾” FNPT ¾” FNPT 

Reject 3/8” tube 3/8” tube 3/8” tube 3/8” tube 

Product 3/8” tube 3/8” tube 3/8” tube 3/8” tube 

Skid Utility Requirements 


High voltage service 115VAC 115VAC 115VAC 115VAC 

High voltage amp 

draw 

10.6 10.6 10.6 10.6 

Motor HP (ref.) ¾ ¾ ¾ ¾ 

Waste drain – max. 0.8 1.6 2.4 3.2 

gpm 

Floor Drain A floor drain (in addition to a waste drain) should be supplied for 

general maintenance 

Skid Physical Dimension Specifications, inches 


Length* 26 26 26 26 

Width* 17 17 17 17 

Height* 62 62 62 62 

Shipping weight 

(lbs.) 

80 90 100 110 

*Does not include operating space requirements. 

Standard Pre-Engineered Options 

Ordering 

Description of Option: 

Information: 

Modem This option provides a modem and necessary communication 

port to allow for remote operation, monitoring and linking 

multiple Reverse Osmosis units together; each individual unit 

must be fitted with a RODI systems controller. The 

components for this option are internal to the RODI Systems 

controller. This option is only available on the LC, VC, VS and 

HZ models. 

Motor voltages This option provides a standard model Reverse Osmosis unit 

with voltage specific wiring and electrical components 

designed to work with the electrical service available. Please 

note, when ordering the 380VAC 50Hz voltage option, due to 

motor RPM reduction, RO performance is slightly de-rated 

from the other standard models. 


Standard Product Ordering Information: 

Vantage RO Part Number Matrix 

VANTAGE MODEL 

WL WALL commercial RO wall mount or portable 

LO L w/o controller commercial RO 

LC L w/ controller commercial RO 

VS Vertical w/ controller commercial RO submersible pump 

VC Vertical w/ controller commercial RO centrifugal pump 

HZ Horizontal w/ controller commercial RO centrifugal pump 

VESSEL QUANTITY DESIGNATION 

01 WL, LO, LC, VS and VC models 

02 WL, LO, LC, VS and VC models 

03 WL, LO, LC, VS, VC and HZ models 

04 WL, LO, LC, VS, VC and HZ models 

05 VS, VC and HZ models 

06 VS, VC and HZ models 

08 VS and VC models 

WL/LO OPTION DESIGNATIONS 

AC 120VAC 1PH 60HZ WITH CONDUCTIVITY MONITOR 

AX 120VAC 1PH 60HZ WITHOUT CONDUCTIVITY MONITOR 

LC OPTION DESIGNATIONS 

AM 120/240VAC 1PH 60 HZ WITH MODEM 

AX 120/240VAC 1PH 60 HZ WITHOUT MODEM 

BM 208VAC 3PH 60HZ WITH MODEM 

BX 208VAC 3PH 60HZ WITHOUT MODEM 

CM 230VAC 3PH 60HZ WITH MODEM 

CX 230VAC 3PH 60HZ WITHOUT MODEM 

DM 460VAC 3PH 50HZ WITH MODEM 

DX 460VAC 3PH 50HZ WITHOUT MODEM 

EM 380VAC 3PH 50HZ WITH MODEM 

EX 380VAC 3PH 50HZ WITHOUT MODEM 

FM 575VAC 3PH 60HZ WITH MODEM 

FX 575VAC 3PH 60HZ WITHOUT MODEM 

VS, VC and HZ OPTION DESIGNATIONS 

AM 208VAC 3PH 60 HZ WITH MODEM 

AX 208VAC 3PH 60 HZ WITHOUT MODEM 

BM 230VAC 3PH 60HZ WITH MODEM 

BX 230VAC 3PH 60HZ WITHOUT MODEM 

CM 460VAC 3PH 60HZ WITH MODEM 

CX 460VAC 3PH 60HZ WITHOUT MODEM 

DM 380VAC 3PH 50HZ WITH MODEM 

DX 380VAC 3PH 50HZ WITHOUT MODEM 

EM 575VAC 3PH 60HZ WITH MODEM 

EX 575VAC 3PH 60HZ WITHOUT MODEM 


VRO WL 04 AX 


Series 1, 2 & 3 Pumps Page 1 of 2 

[ Home ] [ Table of Contents ] [ Site Map ] [ Contact PROCON ] [ Pre-Order Form ] [ UPS Tracking ] 

Form 105 10-97 

Series 1 Brass Series 2 Brass Series 3 Stainless Steel 

General Information Standard Specifications 

PROCON Series 1, 2 , & 3 pumps 

are of the positive displacement 

Capacity 15 1 125 GPH 

rotary-vane type with capacities to 

Nominal Speed 

125 gallons per gour and discharge 

1725 RPM 

pressures up to 250 PSI. 

Typical Horsepower .25 to .50 HP 

They are ideally suited for handling Required 

many cleaning fluids. 

Maximum Discharge 

Pressure 

250 PSI 

The have the unique ability to 

handle many liquids with low 

lubricating characteristics. 

Special internal materials and 

unique design eliminate metal-tometal 

contact and make PROCON 

pumps low in starting torque. 

PROCON vane pumps are selfpriming. 

PROCON pumps are quiet and 

have low vibration and pulsation 

characteristics. 

Flow remains constant over the 

entire pressure range. 

You can mount PROCON vane 

Rotation (viewd from 

nameplate end) 

Clockwise 

Dry Weight Approx. 2.5 lbs. 

Dimensions 3.56"x3.49"x3.86" 

Self-Priming 

(water) 

6 ft. Maximum Lift 

Port size 3/8 NPT Inlet & 

Outlet 

Options 

PROCON Series 1 pumps have the protection of 

an integral strainer to trap particles that can 

http://www.proconpumps.com/Form105.htm 1/17/02

Series 1, 2 & 3 Pumps Page 2 of 2 

You can mount PROCON vane 

pumps on NEMA 56C frame motors 

for a coupling drive or attach them 

to NEMA 48YZ motors with a Vband 

clamp. 

PROCON vane pumps do not have 

to be lubricated and are virtually 

maintenace-free throughout their 

entire life except for cleaning the 

strainer. 

PROCON provides a quick and low 

cost factory rebuild service. 

NSF International listed pumps are 

available. 

an integral strainer to trap particles that can 

cause serious damage to the pump. 

Most PROCON pumps are available with or 

without a built-in relief valve. The relief valve 

temporarily protects against dangerous 

overpressure. All relief valves are preset at the 

factory to your specifications (30-250 PSI 

range). At the specified setting, the flow will 

fully by-pass from the outlet to the inlet through 

the relief valve chamber. 

PROCON offers a wide range of options, so we 

can tailor-make a pump for most systems. Some 

of the options we can offer include special seals, 

mounting flanges, rotations, and clearances. 

Click image to view larger graph. 

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this page. 

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[ Pre-Order Form ] [ Search Our Site ] [ Isometric View of Pumps ] 

Copyright © 1999 - 2002 PROCON® Products. All rights reserved. 

Revised: October 19, 2000. 

http://www.proconpumps.com/Form105.htm 1/17/02

Product Information 

FILMTEC Membranes 

FILMTEC ® 2.5" Tapwater RO Elements 

Product Specifications 

Product 

Product Water Flow Rate 

(gpd) (m 

Minimum Salt Stabilized Salt 

3/d) (l/h) Rejection CI - (%) Rejection CI - (%) 

TW30-2514 175 0.66 28 98.0 99.0 

TW30-2521 300 1.14 47 98.0 99.0 

TW30-2527 475 1.80 75 98.0 99.0 

TW30HP-2527 600 2.27 95 98.0 99.0 

TW30-2540 650 2.46 104 98.0 99.0 

TW30HP-2540 1000 3.80 150 98.0 99.0 

1. Permeate flow and salt rejection based on the following test conditions: 2000 ppm NaCI, 225 psi 

(1.6 MPa), 77°F (25°C), pH 8, and recovery as indicated below. 

2. Flow rates for individual elements may vary -15%/+25% for TW30-2514, TW30-2521, TW30-2527 

and TW30-2540 and -15%/NUL (NUL: No Upper Limit) for TW30HP-2527 and TW30HP-2540. 

3. Sales specification may vary slightly as design revisions take place. 

C DIA 

Feed 

B 

Operating Limits 

Membrane Type.............................................................................Thin-Film Composite 

Maximum Operating Pressure............................................................300 psi (2.1 MPa) 

Maximum Feed Flow Rate...................................................................6 gpm (1.4 m 3/h) 

pH Range, Continuous.........................................................................................2 to 11 

pH Range, Cleaning Cycle (30 min.) ...................................................................1 to 12 

Maximum Operating Temperature ...........................................................113° F (45 °C) 

Maximum Feed Turbidity......................................................................................1 NTU 

Maximum Feed Silt Density Index .........................................................................SDI 5 

Free Chlorine Tolerance ..................................................................................

Important Operating Information 

1. Keep elements moist at all times 

after initial wetting. 

2. If operating specifications given in 

this Product Information bulletin 

are not strictly followed, the limited 

warranty will be null and void. 

3. Permeate obtained from first hour 

of operation should be discarded. 

4. To prevent biological growth during 

storage, shipping, or system 

shutdowns it is recommended that 

elements be immersed in a 

protective solution. The standard 

storage solution contains 1.5 

percent (by weight) sodium 

metabisulfite (food grade). 

5. Elements must be in use for 

at least six hours before 

formaldehyde is used as a biocide. 

If the elements are exposed to 

formaldehyde before being in use 

for this period of time, a loss in flux 

may result. 

6. The membrane shows some 

resistance to short-term attack by 

chlorine (hypochlorite). Continuous 

exposure, however, may damage 

the membrane and should be 

avoided. 

7. The customer is fully responsible 

for the effects of incompatible 

chemicals on elements. Their 

use will void the element limited 

warranty. 

*Trademark of The Dow Chemical Company 

FILMTEC Membranes 

For more information about FILMTEC membranes, 

call Dow Liquid Separations: 

North America . . . . . . . . . . .1-800-447-4369 

Latin America . . . . . . . . . . .(+55) 11-5188-9345 

Europe . . . . . . . . . . . . . . . .(+31) 20-691-6268 

Japan . . . . . . . . . . . . . . . . .(+81) 3-5460-2100 

Australia . . . . . . . . . . . . . . .(+61) 2-9776-3226 

http://www.dow.com/liquidseps 

Notice: The use of this product in and of itself does not necessarily guarantee the removal of cysts and pathogens from water. 

Effective cyst and pathogen reduction is dependent on the complete system design and on the operation and maintenance of the system. 

Notice: No freedom from any patent owned by Seller or others is to be inferred. Because use conditions and applicable laws may differ from one 

location to another and may change with time, Customer is responsible for determining whether products and the information in this document are 

appropriate for Customer’s use and for ensuring that Customer’s workplace and disposal practices are in compliance with applicable laws and 

other governmental enactments. Seller assumes no obligation or liability for the information in this document. NO WARRANTIES ARE GIVEN; 

ALL IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY EXCLUDED. 

Published March 1998. 

Form No. 609-09030-398XQRP 

CH 172-033-E-398R

USFilter USFilter USFilter USFilter 


Lowell, Massachusetts 01851 

Tel: (800) 875-7873 • Fax: (978) 441-6025 

Model MC10 

RO Controller 

Installation and 

Operating Manual

Manual Revisions i 

Model MC10 RO Monitoring 

and Control System 

Installation and Operating Manual 

Issue Date Effective Pages Description of Changes 

Prototype 05/2000 - Original Issue 

Rev A 07/2000 - Prototype Modifications 

Rev B 01/2001 - Symbols 

Rev C 03/2001 - Wiring Terminals 

Rev D 03/2001 - 

Changes to Menu 

Diagram 

Rev E 05/2001 - General Modifications 

Rev F 05/2001 - General Modifications 

Rev G 09/2001 3-3, 3-4, 3-5 Data Logger Interval 

Rev H 10/2001 - Validation Modifications 

Rev I 12/2001 1-4, 1-5, 3-2, Menu Level Switch Operation

Conventions and Symbols ii 

Special characters, listed and described below, are used in this documentation to emphasize certain 

information. 

! 

Note: Emphasizes additional information pertinent to the subject matter. 

Warning: Emphasizes information about actions which may result in personal injury. 

Caution: Emphasizes information about actions which may result in equipment 

damage. 

The following electrical symbols may be used in this documentation. 

Symbol Meaning 

Direct current. 

Alternating current. 

Both direct and alternating current. 

Earth (ground) terminal. 

Frame or chassis terminal.

General Limited Warranty iii 

Warranty 

United States Filter Corporation ("USFilter") warrants the products manufactured by it 

against defects in materials and workmanship when used in accordance with the 

applicable instructions for a period of one year from the date of shipment of the 

products. USFilter MAKES NO OTHER WARRANTY, EXPRESSED OR IMPLIED. 

THERE IS NO WARRANTY OF MERCHANTABILITY OR FITNESS FOR A 

PARTICULAR PURPOSE. The warranty provided herein and the data, specifications 

and descriptions of USFilter products appearing in USFilter’s published catalogs and 

product literature may not be altered except by express written agreement signed by 

an officer of USFilter. Representations, oral or written, which are inconsistent with 

this warranty or such publications are not authorized and if given, should not be 

relied upon. 

In the event of a breach of the foregoing warranty, USFilter’s sole obligation shall be 

to repair or replace, at its option, any product or part thereof that proves defective in 

materials or workmanship within the warranty period, provided the customer notifies 

USFilter promptly of any such defect. The exclusive remedy provided herein shall 

not be deemed to have failed of its essential purpose so long as USFilter is willing 

and able to repair or replace any nonconforming USFilter product or part. USFilter 

shall not be liable for consequential damages resulting from economic loss or 

property damages sustained by a customer from the use of its products. 

Failure to follow the instructions presented in this manual may compromise the 

safety features built into this product. 

For Product and Service Information 

USFilter 


Lowell, MA 01851 

Telephone: (978) 934-9349 

FAX: (978) 441-6025 

For Technical Support – Call 

(800) 875-7873 Extension 5000

Table of Contents iv 

MC10 Overview 1-1 

Introduction 1-1 

Features 1-1 

Specifications 1-2 

Outputs 1-2 

Inputs 1-3 

Mode 1-4 

Controls 1-5 

Expansion Port 1-5 

Serial Port 1-5 

Data Logging 1-5 

Installation 2-1 

Environmental 2-1 

Mounting 2-1 

Ground 2-2 

Connections 2-2 

Power 2-2 

I/O 2-3 

Outputs 2-3 

Inputs 2-3 

Conductivity 2-4 

Modem 2-4 

Operation 3-1 

Controls 3-1 

Keypad 3-1 

LED Indicators 3-2 

Sequence 3-3 

Screens 3-3 

Main Menu 3-3 

Status Screen 3-3 

Quality Screen 3-3 

Alarm Log 3-3 

Settings Screen 3-3 

Settings Table 3-4 

Sanitization Lock 3-6 

Time Delays 3-7 

Calibration 4-1 

Introduction 4-1 

Conductivity Calibration 4-1 

Troubleshooting 4-2 

Temperature Calibration 4-2 



Appendix 

Menu Diagram

MC 10 Overview 1 

Introduction The MC10 Reverse Osmosis Controller is designed to control and monitor the 

operating parameters of a single pump reverse osmosis water purification system. 

Information is displayed on a back-lit liquid crystal display, and on individual lightemitting 

diodes (LED). Functions and controls are operated through switches on the 

keypad. 

Main Menu 

Mode=Direct Feed 

Hrs Since Start=000 

System On 

1 2 3 

Features The MC10 incorporates the following features: 

4 

CLR 

5 6 

7 8 9 

0 

ENT 

Main 

Menu 

LOW QUALITY 

HIGH TEMP 

TANK FULL 

CHEM PUMP FAIL 

HIGH PRESSURE 

LOW PRESSURE 

PRETREATMENT OUT 

OVERLOAD 

SYSTEM START 

SYSTEM STOP 

ALARM RESET 

ALARM SILENCE 

Front View of Model MC10 

RO System Controller 

• Temperature Compensated Conductivity Monitor with Percent Rejection and 

Adjustable Alarm Setpoint 

• Water Temperature Monitor with Adjustable High Temperature Shutdown 

• Three Modes of Operation: Stand-by, Tank Feed, and Direct Feed 

• Pretreatment Interlock 

• High Tank Level Shutdown 

• Low Tank Level Restart 

• Inlet Valve Control 

• Chemical Feed Pump Control* 

• Pump Control 

• Low Feed Pressure Sensing with Automatic Reset 

• High Pressure Sensing 

• Autoflush with Adjustable Flush Interval and Duration 

• Permeate Diversion Valve Output 

• Alarm Output 

• Sanitization Password Lockout 

• Data Logging 

• Ports for Expansion and Serial Communication* 

• Modem for remote monitoring (Optional)* 

* For use with non-medical VANTAGE RO systems only. 

(NOT for use with Med-RO systems.)

Specifications The MC10 incorporates the following specifications: 

Power Requirements: The controller can operate with a power source of 110, 

208, or 230 VAC single phase, 50 or 60 Hz. Depending upon the 

voltage being used, the power must be wired to the proper position on 

the power terminal strip near the transformer. 

Environment: The controller can operate at a temperature from 0° to 55° C (32° 

to 131° F). Relative humidity must not exceed 95 percent. 

Conductivity Monitor: The conductivity monitor measures the feed and product 

water quality and displays this information in uS/cm. The display is 

temperature compensated to 25° C (77° F). The controller calculates 

and displays the percent rejection of the system, and has an adjustable 

alarm setpoint. 

Outputs The MC10 is equipped with the following outputs: 

Inlet Solenoid: A 24 VAC output is provided to power the inlet solenoid valve. 

This output always energizes 15 seconds before the pump turns on, 

and de-energizes 15 seconds after the pump turns off. All water 

systems equipped with this controller are also equipped with a 

compatible inlet solenoid valve. If the valve must be replaced it must 

function on 24 VAC and have a current load less than one ampere. 

AutoFlush Valve: A 24 VAC output is provided to power the reject (Autoflush) 

solenoid valve. This output will energize during the flush cycle thus opening 

the valve and allowing flow to bypass the reject control valve. If the valve 

must be replaced it must function on 24 VAC and have a current load less 

than one ampere. 

Chemical Injection Pump*: A 24 VAC output is provided to control a chemical 

injection system. This output energizes before the main pump starts and deenergizes 

before the main pump shuts down. This output is intended to 

power a relay or some other low current device. 


(NOT for use with Med-RO systems.) 

Motor Starter: A 24 VAC output is included to provide controlled pump 

operation. This output powers the coil of the magnetic starter relay. 

This output is energized depending on other operating parameters. 

This output also has a maximum current rating of one ampere. 

Permeate Diversion Valve: This is also a 24 VAC output. When the percent rejection 

of the system is below the setpoint, this output will be energized. This valve 

is not included with the system. This output is intended to power a relay or 

some other low current device. The maximum current available is one 

ampere. 

Alarm: This consists of a 108 db alarm horn mounted inside the MC10 enclosure. 

The horn is energized when the following conditions are present: 

1-2

• Low Pressure Shutdown 

• High Pressure Shutdown 

• High Temperature Shutdown 

• When Percent Rejection is Below Setpoint 

All outputs are protected by positive temperature coefficient resistors (polyfuses). 

The polyfuses interrupt the current to the MC10 outputs should an overload condition 

occur on an output. The polyfuses will reset when power is turned off to the MC10 

and the fuse is allowed to cool. This eliminates the need for replaceable fuses and 

prevents damage caused by the incorrect fuse being installed. Both the primary and 

secondary sides of the transformer in the MC10 are also protected by polyfuses. 

Inputs The MC10 is equipped with the following inputs: 

1-3 

Conductivity Sensors: There are four inputs for each conductivity sensor, two for the 

temperature detector (RTD) and two for the electrodes in the conductivity 

cell. Inputs are available for both the feed and product sensors. Using a 

sensor with a cell constant of 1.0 provides a detection range of 10-1000 

uS/cm. Using a sensor with a cell constant of 0.1 provides a detection range 

of 1-100 uS/cm. Only sensors with a 1000 ohm RTD will work with this 

controller. 

Low Pressure Switch: This is a dry contact that signals the system to shut down if the 

pump suction pressure falls below the desired value. This is a normally open 

contact. When a circuit is not complete between the two terminals, the 

system will operate. If contact is made between the two terminals, the 

system will shut down. An LED will indicate when the system is in a state of 

low pressure shut down. If the contacts open (pressure returns) within 30 

seconds of a shutdown, the system will attempt to restart. The system will 

make up to five attempts at restarting. The system must be able to run 

continuously for thirty seconds without sensing low pressure. If the controller 

senses low pressure after the fifth restart, it will lock out and the alarm reset 

button must be pressed to resume operation. 

High Pressure Switch: This is a dry contact that signals the system to shut down if 

the pump discharge or membrane pressure exceeds the desired value. This 

is a normally open contact. When an open circuit condition exists between 

the two terminals, the system will operate. If contact is made between the 

two terminals, the system will shut down. An LED will indicate when the 

system is in a state of high pressure shut down. The alarm reset button must 

be pressed to resume operation after a shutdown due to high pressure. 

Tank Level: The controller has two inputs that accept the dry contacts for the high 

level and low tank level switches. If the controller is in the “Tank Feed” mode 

(see the “Settings menu” section of this manual for further discussion), these 

switches read the water level in the RO product storage tank and turn the 

pump ON or OFF depending on the level. Each switch should be installed in 

the tank so that the contacts close when the water level falls below that 

particular switch. An LED will indicate when the system is in a state of high 

tank level “Tank Full”, the pump will turn off and the “Tank Full” LED will 

begin to blink. The pump will remain off and the “Tank Full” LED will 

continue blinking until the water level drops below the low tank level switch (2 

level switch operation).

! 

The MC10 may be configured to use only one tank level (high tank level) switch. 

Again the system must be operated in the “Tank Feed” mode (see the “Settings 

menu” section of this manual for further discussion). When this configuration is being 

used, the “Tank Full” LED will indicate when the system is in a state of high tank level 

(level switch open). The system starts and stops based only upon high tank level 

and the “High Tank Startup Delay” setpoint. When the level drops (the switch closes), 

the system will re-start after the “High Tank Startup Delay” (see “Settings Menu” 

section of this manual for further discussion). The “Tank Full” LED will blink while the 

“High Tank Startup Delay” timer is timing. 

Pretreatment Interlock: This is a dry contact that signals the system to shut 

down when a pretreatment device is not functioning or regenerating. 

This could be used on a water softener, multimedia filter, chemical feed 

pump, pressure differential switch on prefilters, etc. This contact is 

normally closed. When a circuit is complete between the two terminals 

the system will operate. If contact is broken the system will shut down. 

An LED will indicate when the system is shut down due to pretreatment 

interlock. The system will restart itself when the contact is closed. 

Chemical Pump Failure*: This is a dry contact that signals the failure of the 

chemical injection system. This input differs from the “Pretreatment 

Interlock” in that it does not allow the system to restart. 



All input connections on the MC10 provide a supply voltage and are designed for dry 

contacts. Do not apply voltage to the inputs as permanent damage may result. 

Mode The MC10 is designed to operate in one of three modes. The mode of operation is 

selected from the Settings menu. 

The stand-by mode is intended to place the system in a temporary nonoperational 

mode. When the system is placed in this mode, it will 

perform a flush as scheduled by the amount of time entered for “Flush 

Interval” in the Settings data entry screen (See “Settings” section of this 

manual). The Flush Interval is the number of minutes between flushes. 

The Flush Duration is the total time in seconds that unit flushes. During 

a flush, both the inlet solenoid and autoflush solenoid valves are open 

and the high pressure RO pump and chemical pump (if applicable) are 

both running. The Permeate Diversion function and % Salt Rejection 

alarm are not activated during a flush. If the Flush Duration is set for 

zero the system will flush for one minute. When the flush is complete, 

the pump will turn off and the inlet and flush valves will close. The 

system will repeat this cycle based upon the time entered in the Flush 

Interval. When the system is flushing, the amount of time remaining in 

the flush cycle will be indicated on the third line of the display. When 

the system is idle, the amount of time remaining until the next flush will 

be indicated. 

The tank feed mode is intended to place the system in an operational mode 

when feeding a storage tank. When in this mode the system will shut 

down when the high tank level switch (not provided) has an open 

contact. The system will restart when the low level switch closes or 

after the High Tank Startup Delay interval if the system is not equipped 

1-4

with a low level tank switch (See “Settings” section of this manual). 

The flush cycle is also enabled in this mode. The controller will activate 

a flush only when the system starts. The Flush Duration is entered in 

the Settings menu (See “Settings” section of this manual). When the 

system is autoflushing, the amount of time remaining in the flush will be 

indicated on the third line of the display. 

The direct feed mode is intended to place the system in an operational mode 

when the system is feeding a distribution loop or another piece of 

equipment. In this mode the system will not flush and the tank level 

switch(es) is/are disregarded. When the system is in this mode, the 

total number of hours the system has been operated will be indicated 

on the last line of the display. 

All three modes of operation are controlled by the System Start and System 

Stop keys. For example, if the system is put in standby mode and the 

System Start key is not pressed, the RO unit will not operate the flush 

cycles. This is the same for tank feed and direct feed modes, if the 

System Start key is not pressed, the RO unit will not operate. The 

system automatically stops the RO unit whenever a change between 

tank feed/direct feed and standby modes is made, requiring the 

operator to restart the RO unit. “SYSTEM STOP” key must be pressed 

prior to changing between tank feed and direct feed operation. 

Controls The MC10 is equipped with the following controls and indicators on the front panel of 

the controller. 

• 4 x 20 LCD with LED Backlight 

• Eight LED Indicators for Alarms and Status 

• 20 Tactile Keys for Control and Data Entry 

Expansion Port* The MC10 is equipped with one RS-485 expansion port which allows it to be 

equipped with additional input modules for pressure and flow. The expansion port 

also allows data from the MC10 to be networked into a larger water treatment 

monitoring system. The RS-485 expansion port is the 6 pin, watertight connector 

located in the upper right hand corner of the left hand side of the MC10 enclosure. 

Use of the expansion port may require a software upgrade to the MC10. 

Serial Port* The MC10 is equipped with one RS-232 serial port which allows it to be equipped 

with an optional internal modem module for remote monitoring and downloading of 

data (program updates, default set points, etc.). The RS-232 serial port is also 

connected to the 5 pin, watertight connector located directly below the RS-485 

expansion port on the left hand side of the MC10 enclosure. Connecting to the serial 

port on the side of the enclosure will automatically disconnect the internal modem. 

Data Logging* The MC10 is designed to log data from the RO system. This data may be retrieved 

locally through the serial port connection or remotely if the MC10 unit is equipped 

with the optional modem. Remote communication and retrieval of logged data 

requires the use of AquaGraph PC software. 



1-5

Installation 2 

Environmental The MC10 is equipped with a NEMA 4X enclosure for use in industrial environments 

subject to occasional exposure to water sprays and other wet conditions. The MC10 

should not be used in explosive environments. General environmental specifications 

are listed below. 

Specification 

Environmental Specifications 

Rating 

Storage Temperature -20 to 70 Deg C 

Ambient Operating Temperature 0 to 55 Deg C 

Ambient Humidity 30% to 95 % Relative Humidity (Non-Condensing) 

Mounting The MC10 is designed to be mounted in a horizontal position on a flat surface by 

means of four mounting holes. Opening the front cover of the enclosure allows 

access to the mounting holes, access to the bottom holes requires temporary 

removal of the hinge assemblies. When mounting the MC10, sufficient room should 

be allowed on the side and bottom of the device for access to the I/O and serial port 

connections. Mounting dimensions are shown below. 

Mounting Hole Distance 6.469" 

Alarm Beeper 

Overall Depth 5.250" 

Serial Port 

Connector 

Expansion Port 

Connector 

Overall Height 7.313" 

Main Menu 



System On 

1 2 3 

4 5 6 

7 8 9 

CLR 0 ENT 

Overall Length 10.875" 

Main 

Menu 

LOW QUALITY 

HIGH TEMP 

TANK FULL 


Cord Seals for 

I/O Connections 

Mounting Hole Distance 10.000" 

HIGH PRESSURE 

LOW PRESSURE 


OVERLOAD 

SYSTEM START 

SYSTEM STOP 

ALARM RESET 

ALARM SILENCE 

7/8" Diameter Hole for 

Conduit or Cord Grip

Ground A good common ground reference (earth ground) is essential for proper operation of 

the MC10. A good earth ground or power circuit ground should be connected to the 

threaded stud just to the left of the power connection terminal on the enclosure 

backpanel. 

Connections Screw terminals are provided for making connections for sensor inputs and power. 

Sensor and I/O terminals are located on the inside of the door of the MC10 

enclosure. The terminals are numbered in ascending order from left to right. Power 

terminals are on the backpanel of the enclosure. Power should always be 

disconnected from the MC10 before making or changing any connections on these 

terminals. 

01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 

Power The incoming power is connected on the terminal blocks just below the transformer 

on the backpanel of the enclosure. The triple tap transformer will accept either 120, 

208, or 230 volts AC (50 or 60 Hz). Depending upon the voltage being used, the 

power is connected to one of three 

terminals as illustrated. If 460 VAC is the 

only power source available, it will be 

necessary to use a separate step-down 

transformer to lower the voltage to 230 

VAC. 

The triple tap transformer is equipped with 

an internal thermal fuse on the primary 

winding. This prevents damage from 

overloads should they occur. 

Always replace the transformer cover 

after making the power connection. 

Terminal Blocks for I/O 

and Sensor Connections 

Connect Ground Here 

0 VAC 

0 

Connect AC Neutral Here 

Terminal Blocks for 

Power Connections 

120 VAC 

120 

If 120 VAC, Connect Here 

208 VAC 

208 


230 VAC 

230 


2-2

I/O The wiring diagram for the input and output connections is shown below. 

Feed Cond (Black) 

Feed Conductivity Sensor 

Feed Cond (Shield) 

Feed Cond (White) 

Black 

Green 

Shield 

Red 

White 

Perm Cond (Black) 

Permeate Conductivity Sensor 

Perm Cond (Shield) 

Perm Cond (White) 

Black 

Green 

Shield 

Red 

White 

Feed Temp (Green) 

Feed Temp (Red) 

Perm Temp (Green) 

Perm Temp (Red) 

24 VAC 

Low Pressure Switch Input 

24 VAC 

High Pressure Switch Input 

24 VAC 

Mid Tank Level Switch Input 

24 VAC 

High Tank Level Switch Input 

24 VAC 

Pretreatment Interlock Input 

24 VAC 

Chem Pump Failure Input * 

Outputs All outputs (with the exception of the external alarm) are 24 VAC, one amp maximum. 

Any device connected to an output should be rated for less than one amp at 24 VAC. 

An overload on any output will cause current to be interrupted to the output and an 

alarm condition will occur. If the transformer supplying the controller becomes 

overloaded, the controller will reboot. If the overload still exists after the controller 

reboots, the controller will shut down the system and log an overload alarm. 

The external alarm output is 12 VDC, 100 mA maximum. This output is designed to 

drive small loads such as indicator lights or small alarm horns. 

Avoid using excessively large wire (larger than 18 AWG) to wire the outputs since it 

may prevent the enclosure door from closing properly. All wires from the outputs 

must pass through the rubber grommet in the cord seal. Any unused openings in the 

grommet must be sealed with plugs to maintain the watertight characteristics of the 

enclosure. 

Inputs All inputs should be dry contacts rated for 24 VAC. Do not apply voltage to the 

inputs. Input voltage to the contacts is supplied by the MC10. 

! 

Avoid using excessively large wire (larger than 18 AWG) to wire the inputs since it 

may prevent the enclosure door from closing properly. All wires from the inputs must 

pass through the rubber grommet in the cord seal. Any unused openings in the 

grommet must be sealed with plugs to maintain the watertight characteristics of the 

enclosure. 

DC Negative 

Alarm Output 12 VDC 

AC Neutral 

Inlet Valve Output 24 VAC 

AC Neutral 

Auto Flush Valve Output 24 VAC 

AC Neutral 

Chem Pump Output 24 VAC * 

AC Neutral 

Motor Starter Output 24 VAC 

AC Neutral 

Permeate Diversion Valve Output 24 VAC 

01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 



2-3 

AC Neutral 

From Transformer 

Ground 

From Backpanel 

24 VAC 

From Transformer

Pretreatment Interlock: This input is designed to be normally closed. If a 

pretreatment interlock input is not being connected, a wire jumper must 

be installed between the two terminals at Input 5. Since the input is 

normally closed, multiple devices may wired to this input in series. 

Pretreatment Failure: This input is designed to be normally closed. If a 

pretreatment failure input is not being connected, a wire jumper must 

be installed between the two terminals at Input 6. Since the input is 

normally closed, multiple devices may wired to this input in series. 

Tank Level Switches: The MC10 is designed to be used with one or two tank 

level switches. Switches should be wired in the normally closed 

position (the switch contacts close when the water level drops below 

the switch). When using two switches, a low-level tank switch starts 

the system (in Tank Feed mode) and a high-level switch stops the 

system. When using one switch, the switch connected must be a highlevel 

switch. The switch will stop the system at high level. When the 

level drops (the switch closes), the system will re-start after the “High 

Tank Startup Delay”, in minutes (See “Settings” section of this manual) 

that has been configured into the Settings data entry screen. The 

controller must be configured for one or two switch operation in the 

Settings menu (See “Settings” section of this manual). 

Conductivity The MC10 is designed to monitor conductivity by means of a standard two electrode 

conductivity cell. Cells with constants of 1.0 must be used. When using a 1.0 cell, 

the conductivity range will be 0-1000 uS/cm. The cells should be equipped with a 

two-wire, 1000 ohm Platinum RTD. 

Conductivity cells should be connected by means of Belden cable no. 8724 or 

equivalent. When routing the conductivity cables, stay clear of AC cables, motors, or 

other sources of electrical interference. Never run sensor cables in the same conduit 

with AC cables. 

Modem* The optional modem for the MC10 is housed inside the MC10. The modem is 

connected by plugging the ribbon cable connector onto the dual row connector 

located on the I/O board under the I/O cover plate. The modem is equipped with a 

! 

standard RJ connector for connection to an analog phone line. Do not connect the 

MC10 modem to an intra-office digital phone line. Damage to the modem can 

occur. Once connected to a modem, the MC10 can be accessed by means of 

Windows-based AquaGraph software for remote monitoring or data retrieval. 



2-4

Operation 3 

Controls The MC10 is housed in a NEMA 4X enclosure with a membrane keypad. Indicators 

include a 4 line x 20 character LCD with LED backlight and eight high intensity LED 

indicators for alarm conditions. The control features of the MC10 are illustrated 

below. 

Main Menu 



System On 

1 2 3 

4 

CLR 

5 6 

7 8 9 

0 

ENT 

Main 

Menu 

LCD Display with Backlight 

LOW QUALITY 

HIGH TEMP 

TANK FULL 


HIGH PRESSURE 

LOW PRESSURE 


OVERLOAD 

SYSTEM START 

SYSTEM STOP 

ALARM RESET 

ALARM SILENCE 

LED Alarm and Status Indicators 

Keys Used for Data Entry and Configuration 

Keypad The membrane keypad contains 20 tactile keys which are used for a number of 

control and data entry functions. 

System Start: Pressing this key starts the system. If the Direct Feed mode has 

been chosen, pressing the System Start key immediately initiates the 

startup sequence. If the Tank Feed mode has been chosen, pressing 

this key will not initiate the startup sequence unless the tank is below 

high-level. Pressing this key in Stand-By mode will initiate the flush 

sequence of flush cycles. 

System Stop: Pressing this key stops the system and essentially turns all 

functions off. 

Keys Used for System Control 

Alarm Reset: Pressing this key resets the system after an alarm shut down for 

low pressure, high pressure, low quality, high temperature, overload, or 

chemical injection failure (VANTAGE RO systems only).

Alarm Silence: Pressing this key silences the alarm horn. The system will still 

shut down if the alarm condition does not correct itself before the 

shutdown delay expires (See “Settings” section of this manual). 

Up Arrow, Down Arrow, Right Arrow: These keys are used to move through the 

display screens and for data entry purposes. 

ENT: This key is used to confirm (ENTER) the various setting values. 

CLR: This key is used to clear an erroneous data entry. The data must be 

cleared before pressing the ENT key. 

Numbers 0-9: These keys are used for data entry as well as for accessing 

various screens directly or for making other selections. 

LED Indicators The eight LED indicators are used to indicate various status and alarm conditions. 

Chem Pump Failure*: Indicates when the system is experiencing failure of the 

chemical injection system. The system will shut down after the chem 

pump failure time delay expires. 



Pretreatment Interlock: Indicates when the system is shut down due to external 

pretreatment equipment. 

Tank Full: LED Solid - Indicates when the storage tank is full. LED Blinking – 

The tank level is transitioning between the High and Low Tank levels. 

The system will only shut down when in the Tank Feed mode. 

Low Quality: Indicates that the percent rejection is below the alarm setpoint. 

Low Pressure: Indicates that the system has experienced low pump feed 

pressure. The system will shut down after the low pressure time delay 

expires. The system will automatically restart up to five times after a 

low pressure shutdown. After which, the “ALARM RESET” key must 

be pressed before restarting. 

High Pressure: Indicates that the system has experienced high pump or 

membrane pressure. The system will shut down after the high pressure 

time delay expires. 

High Temperature: Indicates that the system has experienced high feed or 

product water temperature. The system will shut down after the high 

temperature shutdown time delay expires. 

Overload Condition: Indicates that the system has experienced an overload 

condition on one of the outputs. It will also indicate if the controller 

transformer has been overloaded due to excessive loads on multiple 

outputs. The system will shut down after the overload time delay 

expires. In the case of a transformer overload, the system will shut 

down and the indicator will illuminate if the controller “reboots” due to 

an overloaded condition. 

3-2

Sequence The normal startup and shut down sequence for the system is listed below. In Direct 

Feed mode, this sequence is initiated when the System Start key is pressed. While 

in Direct Feed mode, the system will not shut down unless the System Stop key is 

pressed or an alarm occurs. In Tank Feed mode, this sequence will be initiated 

every time the system starts and stops as controlled by tank level. When in Tank 

Feed mode, this sequence will also be used for the autoflush cycles with the addition 

of the activation of the autoflush solenoid valve. When in Stand-By mode, this 

sequence is used for the autoflush cycles with the addition of the activation of the 

autoflush solenoid valve. 

Startup Shutdown 

Open Inlet Valve Stop Pump 

Open Autoflush Valve (during autoflush sequence only) Fifteen Second Delay 

Start Chemical Feed (VANTAGE RO systems only) Close Inlet Valve 

Ten Second Delay Close Autoflush Valve (if open) 

Start Pump 

The autoflush sequence is activated only in the Tank Feed and Stand-By modes of 

operation. Autoflush interval and duration are controlled by the interval and duration 

presets configured into the MC10 in the Settings menu. 

Screens The MC10 displays data and operating status by means of a number of screens 

displayed on the LCD. Specialized screens are also used for configuring the system 

and for entering setpoints, time delays, deadbands, etc. The next page illustrates the 

screens displayed by the MC10. 

Main Menu The Main Menu consists of two screens which are accessed using the up and down 

arrow keys. The Main Menu screen displays the current operating mode, run status, 

and either hours since start (Direct Feed mode) or autoflush information (Standby 

mode). Only current operating mode and run status will be indicated while in Tank 

Feed mode. The Main Menu screen also allows the user to access other screens. 

Status Screen Status screen is accessed by pressing the number 2 on the keypad from the second 

Main Menu screen. The Status screen displays the total run time (RT) in 100 hours 

indicated as tenths of 1000 hours (As an example 0.0257 is the same as 257 hours) 

along with the time remaining until the next service, which is indicated in 1000 hour 

increments. When service is due, the words “Call for Service” will flash at the bottom 

of the Main Menu screen. 

Quality Screen Quality screen is accessed by pressing the number 3 on the keypad from the second 

Main Menu screen. The Quality screen displays the feed conductivity (FCnd), 

permeate conductivity (PCnd), feed temperature (in degrees C), and percent 

rejection (%SR). 

Alarm Log Alarm Log screen is accessed by pressing the number 4 on the keypad from the 

second Main Menu screen. The user may tab through the alarm log by using the up 

and down arrow keys. The Alarm Log will hold up to 256 alarms along with the time 

and date of the alarm. In the event that Alarm Log needs to be cleared, press the 

right arrow key on the keypad. The user is prompted for the access code to clear the 

Alarm Log (factory default access code = 12345). 

Settings Screen Settings screen is accessed by pressing the number 5 on the keypad from the 

second Main Menu screen. The Settings screen itself has six selections. The first 

selection, number 0 on the keypad, allows the user to set the time (hours, minutes 

3-3

and seconds), date (day, date, month and year) access (factory default access code 

= 12345) and sanitize lockout (factory default sanitize lockout code = 12345) codes. 

The MC10 maintains time on a 24 hour clock (i.e., military style). The hours, 

minutes, and seconds are changed on separate screens by entering the appropriate 

number and pressing “ENTER”. Date, month, and year are entered in the same 

fashion. The MC10 also requires that the day of the week be entered (Sunday = 1, 

Saturday = 7). 

The second selection from the Settings Screen, number 1 key, allows the user to 

change the operating mode of the MC10; Sanitize, Standby or Tank/Direct Feed 

modes. The third selection, number 2 key, allows access to the Settings data entry 

screens. The user is prompted for the access code to enter sub menu 0 (Clock) or 2 

(Settings) of the Settings screen (factory default access code = 12345). 

The fourth selection, number 3 key, automatically initializes the modem. This only 

needs to be done one time after a modem is installed in the controller. The fifth 

selection, number 4 key, allows the user to select the data log interval. The sixth 

selection, number 5 key, erases the data currently in the data logger. 

Upon entering the Settings data entry screens (by pressing “2” from the main 

Settings screen), the user will have the option of entering an index number for a 

particular setting. This enables the user to go directly to a particular setting without 

scrolling through the entire list of settings. Alternatively, the user may scroll through 

the settings with the up and down arrow keys. 

Settings Table The table below lists the index number of all of the Settings data entry screens, the 

abbreviation used on the screen, the full name of the setting, and any other pertinent 

information on that particular setting. 

Settings Table 

NOTE: Where required, the right arrow key is used to enter the decimal point. 

MC10 Settings 

Index Screen Name Full Name Range Format 

0 Feed 

1 Low Salt Rjct SP % 

2 Low Salt Rjct DB % 

3 Low Salt Rjct TDsec 

4 Low Salt Rjct SDsec 

5 Perm Divert SP % 

6 Perm Divert DB % 

Tank or Direct 

Feed 

Low Salt 

Rejection 

Setpoint 

Low Salt 

Rejection 

Deadband 

Low Salt 

Rejection 

Time Delay 

Low Salt 

Rejection Shut 

Down Delay 

Permeate 

Diversion 

Setpoint 

Permeate 

Diversion 


0 or 1 0 1 

80-100 00.0 90 

0-20 00.0 0.5 

1-255 000 1 

1-255 000 1 

80-100 00.0 80 

0-20 0.0 1.0 

Default 

Setting 

Details 

Allows the user to choose between tank 

feed or direct feed operation. Enter 0 for 

tank feed or 1 for direct feed. 

Setpoint (in %) which activates the alarm 

for low salt rejection. 

Deadband (in %) through which the salt 

rejection value must increase to release 

the low salt rejection alarm. 

Delay (in seconds) before the low salt 

rejection alarm is activated once the 

current value falls below the setpoint. 

Delay (in seconds) before the system 

shuts down after the low salt rejection 

alarm is activated. 

Permeate conductivity setpoint (in %) 

which activates the permeate diversion 

valve. 

3-4 

Deadband (in %) through which the 

permeate conductivity value must 

increase before the permeate diversion 

valve is released.

7 Perm Divert TD Sec 

8 High Temp SP DegC 

9 

High Temp DB 

DegC 

10 High Temp TD Sec 

11 

12 

High Temp Shtdwn 

Sec 

High Tank Lvl TD 

Sec 

13 Low Tank Swtch EN 

14 Hi Tnk Startup Sec 

15 

16 

17 

Low Tank Lvl TD 

Sec 

High Pressure TD 

Sec 

Low Pressure TD 

Sec 

18 Overload TD Sec 

19 Pretrt Intlk TD Sec 

20* Chem Pump TD Sec 

21 Flush Interval Min 

22 Flush Duration Sec 

23 Feed CND Standard 

24 Perm CND Standard 

25 Feed Temp Zero 

Permeate 

Diversion 

Time Delay 

High 

Temperature 

Setpoint 

High 

Temperature 


High 

Temperature 

Time Delay 

High 

Temperature 

Shut Down 

Delay 

High Tank 

Level Time 

Delay 

Low Tank 

Switch Enable 

High Tank 

Level Restart 

Time Delay 

Low Tank 

Level Time 

Delay 

High Pressure 

Time Delay 

Low Pressure 

Time Delay 

Overload 

Time Delay 

Pretreatment 

Interlock Time 

Delay 

Chemical 

Pump Failure 

Time Delay 

Auto Flush 

Interval 

Auto Flush 

Duration 

Feed 

Conductivity 

Standard 

Permeate 

Conductivity 

Standard 

Feed 

Temperature 

Zero 

Calibration 



1-255 000 15 

0-45 00 32 

0.1-10 0.0 3 

1-255 000 20 

1-255 000 10 

1-255 000 5 

0 or 1 0 1 

1-1000 000 30 

1-255 000 5 

1-255 000 5 

0-255 000 5 

1-255 000 2 

1-255 000 2 

0-100 000 2 

1-90 000 60 

1-360 000 180 

10-3000 0000 NA 

0-1000 00.0 NA 

1-1500 000 NA 

Delay (in seconds) before the permeate 

diversion valve is activated once the 

current value falls below the setpoint. 

Temperature setpoint (in deg C) which 

activates the high temperature alarm. 

Deadband (in deg C) through which the 

temperature value must pass before the 

high temperature alarm is released. 

Delay (in seconds) before the high 

temperature alarm is activated once the 

current value rises above the setpoint. 


shuts down after the high temperature 

alarm is activated. 


shuts down for high tank level. 

Allows the system to be configured with 

or without a low tank level switch. Enter 

“1” to enable (low tank level switch 

present) or “0” to disable (low tank level 

not being used) this feature. 

Delay (in seconds) before the system will 

restart after the tank level drops below 

the high tank level switch. This feature is 

only used when the system is configured 

for operation without a low tank level 

switch. 


restarts (in Tank Feed mode) when the 

level drops below the low tank level 

switch. 


shuts down for high pressure. 


shuts down for low pressure. 


shuts down for output overload. 


shuts down for pretreatment interlock. 


shuts down for failure of the chemical 

injection pump. 

3-5 

Interval (in minutes) between autoflush 

cycles. 

Duration (in seconds) of each autoflush 

cycles. 

With these settings, the user can 

calibrate the conductivity inputs to a 

standard solution. See Calibration 

section for more information. 

This setting allows the temperature 

sensor in the feed conductivity cell to be 

calibrated to zero degrees C. Only 

qualified users following the procedures 

documented in the Calibration section of 

this manual should adjust this setting.

26 

Feed Temp Span 

DegC 

27 Perm Temp Zero 

28 

Perm Temp Span 

DegC 

Feed 

Temperature 

Span 

Calibration 

Permeate 

Temperature 

Zero 

Calibration 

Permeate 

Temperature 

Span 

Calibration 

1-60 00.0 NA 

1-1500 000 NA 

1-60 00.0 NA 


sensor in the feed conductivity cell to be 

calibrated to a known temperature at 

span value. Only qualified users 

following the procedures documented in 

the Calibration section of this manual 

should adjust this setting. 


sensor in the permeate conductivity cell 

to be calibrated to zero degrees C. Only 

qualified users following the procedures 

documented in the Calibration section of 

this manual should adjust this setting. 


sensor in the permeate conductivity cell 

to be calibrated to a known temperature 

at span value. Only qualified users 

following the procedures documented in 

the Calibration section of this manual 

should adjust this setting. 

Sanitization Lock From the Operating Mode screen, the user may select “Sanitization Lock”; Main 

Menu screen, select keypad number 5 (Settings), select keypad number 1 

(Mode), select keypad number 1 (San lock). Following this the RO unit will be placed 

in the Sanitization lockout mode. If the RO is currently operating, the RO unit will 

immediately shutoff, the controller display will indicate MODE=Sntz Lock and MIN 

(minutes) since Lock. If the RO unit is not currently running, regardless of mode of 

operation, all operation sequencing will immediately cease, the RO unit will placed in 

a controls level lockout condition and the controller display will indicate MODE=Sntz 

Lock and MIN (minutes) since Lock. This prevents the system from operating from a 

controls standpoint while sanitizing agents are present. 

3-6 

The controller must be powered up (display illuminated) for the sanitization feature to 

operate properly, in the event that power is interupted during a sanitization 

procedure, the controller will remain locked out of service. 

Following the sanitization process, pressing any of the arrow keys or the green 

“MAIN MENU” key on the keypad will prompt the operator to enter the unit 

sanitization lockout code, “LOCKOUT RESTART”, “Enter Access Code” will be 

displayed. The operator must enter the five digit sanitization lockout code to exit the 

sanitization lockout mode. Following this RO unit may once again be operated in any 

of the three available normal operating modes. 

Refer to the RO unit Operation and Maintenance manual accompanying the unit for 

proper sanitization precautions, proper materials and procedures.

Time Delays Time delays and deadbands are used to control the action of the MC10 alarms. 

These are described below. 

Process Value 

Time 

Delay 

Time 

Alarm is Released When Rising Process Value 

Exceeds Setpoint Plus Deadband 


Low Alarm Setpoint 

Alarm Activates at End of Time Delay 

The illustration above shows the action of a low alarm setpoint on a falling value. 

The high setpoint works in the same manner except the deadband is below the 

setpoint. 

Process Value 

Time 

Delay 

Time 

Alarm Activates at End of Time Delay 

High Alarm Setpoint 


3-7 

Alarm is Released When Rising Process Value 

Drops Below Setpoint Minus Deadband

Calibration 4 

Introduction A number of parameters monitored by the MC10 must be periodically calibrated for 

optimum performance and accuracy. These are outlined below. 

MC10 Calibration 

Parameter Method of Calibration 

Feed Conductivity 

Permeate 

Conductivity 

Feed Temperature 

Zero 

Feed Temperature 

Span 

Permeate 

Temperature Zero 

Permeate 

Temperature 

Calibration with Conductivity 

Standard Solution 

Calibration with Conductivity 

Standard Solution 

Settings 

Index 

Number 

23 

24 

Calibration to Zero Degrees C 25 

Calibration to Known 

Temperature 

26 

Calibration to Zero Degrees C 27 

Calibration to Known 

Temperature 

28 

Recommended 

Calibration 

Frequency 

One to Three 

Months Depending 

Upon Sample 

Condition 

Six Months 

Conductivity The conductivity inputs of the MC10 should be calibrated using a known standard 

solution. Value of the standard should be in the upper area of the range of the 

conductivity being measured by the MC10. 

In cases of low conductivity (< 50 uS/cm) it may be necessary to calibrate the sensor 

and its associated input channel in situ. This is done by following the same general 

procedure as outlined below for calibration to a standard solution with one exception. 

In situ calibration requires that the sensor be left mounted in the process line. 

Instead of using a standard solution, a sample from the process line is tested with a 

calibrated meter. This measured conductivity value of the process fluid is used in lieu 

of a standard solution value. 

The following procedure should be used for calibrating the MC10 to a solution of 

known conductivity. 

Step One – Rinse or soak the sensor in deionized water. Dry the sensor and place it 

in a solution of known conductivity. This may be a standard solution provided a 

laboratory supply company or a water sample which has been measured by a 

calibrated conductivity meter. Make sure that the conductivity value of the calibration 

solution is within the upper range of the MC10 conductivity channel. Allow the 

sensor to equalize to the solution temperature for a few minutes before proceeding 

with the next step.

Important Please note: 

• Temperature and conductivity are combined in one sensor. 

• If temperature and conductivity are both being calibrated, always calibrate the 

temperature first. 

• Be careful not to damage (avoid excessive twisting, bending, etc.) the sensor 

leads when removing the sensor from the pipe fitting. 

• Never reuse standard solutions. Always dispense the solution from its container 

and dispose of the solution after using it. 

• Use clean containers (triple rinsed with deionized water) for holding the 

calibration solution. 

Step Two – Go to the appropriate Settings data entry screen (23 or 24). Enter the 

value of the calibration solution via the keypad. Press ENTER. A new measured 

value will appear on the screen. 

If the value displayed on the screen does not match the value entered for the 

calibration solution, let the sensor equalize for a few more minutes and repeat Step 

Two. 

Troubleshooting If problems occur during calibration, please check the following: 

• Ensure that the Settings screen corresponds to the sensor being calibrated. 

• Check the condition of the sensor. Make sure that the electrode surfaces are not 

damaged, corroded, or fouled. 

• Make sure that the sensor is suitable for use with the MC10. Verify that the cell 

constant is in the correct range and that the sensor is equipped with the proper 

temperature element (1000-Ohm Platinum RTD). 

• Check the condition of the sensor wiring and that the sensor leads are properly 

connected to the MC10 terminals. 

• Verify that the calibration solution is the correct conductivity value and that the 

value is within the range of the conductivity input being calibrated. 

• Refer to the Troubleshooting Section of the manual for more information. 

Temperature The temperature elements in the conductivity sensors are calibrated in a similar 

fashion as the conductivity sensors. Follow these steps for temperature calibration. 

Important Please note: 

Settings Screen 

Index Number 

Standard Value (uS) Previously 

Used for Calibration 

SETTINGS 

>26< FCnd=XXX 

Feed CND Standard 

OLD=1000 New=? 

Step One – Place the conductivity sensor in an ice bath. Allow the sensor to 

equalize for a few minutes. 

• Temperature and conductivity are combined in one sensor. 

• If temperature and conductivity are both being calibrated, always calibrate the 

temperature first. 

4-2 

Conductivity Being Measured by Sensor 

(Updates Only When "ENTER" is Pressed) 

Enter Value of Calibration 

Solution (uS) Via Keypad

• Be careful not to damage (avoid excessive twisting, bending, etc.) the sensor 

leads when removing the sensor from the pipe fitting. 

• The conductivity standard solution may be used for temperature calibration when 

combining the temperature and conductivity calibrations. 

Step Two – Go to the appropriate Settings data entry screen (25 or 27). The 

following screen will appear: 


Index Number 

Raw Value Previously 


The screen will display the raw analog value being measure from the temperature 

sensor. Enter this value from the keypad and press ENTER. The value shown near 

the top of the screen should match the value entered. If not, wait a minute longer 

and re-enter the number. 

Step Three – Place the conductivity sensor in a water sample at approximately the 

same temperature as that being monitored in the process. Measure the temperature 

with a laboratory grade thermometer. Allow the sensor to equalize to the solution 

temperature for a few minutes before proceeding with the next step. 

Step Four – Go to the appropriate Settings data entry screen (26 or 28). Enter the 

temperature of the calibration solution via the keypad. Press ENTER. A new 

measured value will appear on the screen. 


Index Number 

Calibration Value (Deg C) Previously 


SETTINGS 

>25< FdZero=XXX 

Feed Temp Zero 

OLD=819 New=? 

SETTINGS [>]=[.] 

>28< FTmp=XXX 

FTemp Calibration 

OLD=20 New=? 

If the value displayed on the screen does not match the value entered for the 

calibration solution, let the sensor equalize for a few more minutes and repeat Step 

Two. 

Troubleshooting If problems occur during calibration, please check the following: 

Raw Value Being Measured by Sensor 


Enter Raw Value Being 

Measured 

Temperature Being Measured by Sensor 


Enter Temperature of Calibration 

Solution (Deg C) Via Keypad 

• Ensure that the Settings screen corresponds to the sensor being calibrated. 

• Check the condition of the sensor. Make sure that the electrode surfaces are not 

damaged, corroded, or fouled. 

• Make sure that the sensor is suitable for use with the MC10. Verify that the 

sensor is equipped with the proper temperature element (1000-Ohm Pt RTD). 

• Check the condition of the sensor wiring and that the sensor leads are properly 

connected to the MC10 terminals. 

• Refer to the Troubleshooting Section of the manual for more information. 

4-3

Troubleshooting 5 

The MC10 Reverse Osmosis Controller is designed for ease of maintenance and 

minimum service. Since the highest quality of electronic semiconductor components 

are used in this design, it is not likely that circuit malfunctions or failures will occur. It 

is our recommendation that service be limited to identifying malfunctions at the board 

level and that component level troubleshooting be referred to USFilter’s Technical 

Support Department (see the phone number listed on the cover of this manual.) 

It is our experience that field failures which most frequently occur are: 

• Improper or broken wiring connections 

• Incorrect wiring of magnetic starter 

• Improper grounding 

• Cable run is too long 

• Water in connectors 

• Dirty cell electrodes 

• Defective conductivity/temperature probes 

Troubleshooting 

Type of Problem Possible Cause or Solution 

1. Motor draws too much current and 

trips magnetic starter. 

2. Controller shuts down on low 

pressure, but pressure in line is 

okay. 

1. Motor overloaded, pump not 

rotating freely. 

2. Bearing defective. 

3. Power distribution not even, 

check voltages and current 

draw on each leg. 

4. Check pin connectors. 

5. Current imbalance (3-phase 

only) 

6. Loss of power on 1 leg (3phase 

only) 

1. Check setting of pressure 

switch. 

2. Check pressure switch wiring, 

must be wired normally closed. 

3. Defective switch, contacts can


be corroded or diaphragm 

could be defective. 

4. Make sure wiring from 

controller to pressure switch 

are shielded wires. Also route 

wire away from any AC lines or 

motor windings. 

5. Inlet to pressure switch is 

obstructed. 

3. Motor starter trips repeatedly. 1. Verify wiring to and from coil 

and controller. 

4. Controller display shows “System 

On” but system does not run. 

5. RO Controller shuts off, does not 

restart, and no alarm indication is 

present. 

6. RO Controller shuts down on high 

temperature even though the 

temperature is below setpoint. 

2. Verify that the overload relay is 

set according to rating 

specified on motor nameplate. 

3. Check the secondary voltage 

on the transformer (should be 

24 VAC ± 2 volts). 

1. Verify wiring. 

2. Check motor starter for 

overload. 

3. Controller is in Tank Mode and 

tank is full. 

4. Controller is in Stand-By Mode 

and system is between auto 

flush cycles. 

1. Possible brown out, or power 

outage reset the controller to 

“System Off”. 

1. Calibrate temperature sensor. 

2. Check sensor wiring. 

5-1 5-2


9. Conductivity monitor shows reading 

to be higher than known solution. 

10. Conductivity monitor does not 

respond to known solution. 

11. Conductivity monitor shows low 

reading for known conductivity 

changes. 

1. Check calibration of each cell. 

2. Sensor electrode not fully 

immersed. 

3. Air bubbles in sensing area. 

4. Fouled sensor. 

5. Defective sensor wiring. 

6. Relocate sensor. 

7. Clean sensor electrode. 

8. Check sensor wiring. 

1. Calibrate sensors. 

2. Check/replace sensors. 

3. Check/replace leads to 

sensors. 

1. Sensor electrode obstructed. 

2. Inadequate solution circulation. 

3. Clean or relocate sensor. 

12. Conductivity reading is erratic. 1. Faulty sensor. 

2. Faulty sensor wiring. 

3. Moisture in cables. 

5-3

Main Menu 



System On 00:00:00 

MENU DIAGRAM 

Press Press 

Press 4 

Press 2 Press 3 

Main Menu 

2)Status 3)Quality 

4)Alarms 5)SettingS 

02/01/00 00:00:00 

ALARM LOG 

Low %SR 

00:00:00 02/01/00 

Press [->] to Clear 

QUALITY 

FCnd[uS/cm]=000 

PCnd[uS/cm]=00 

T[C]=00 %SR=00.0 

STATUS 

RT(1000 Hrs)=0.0000 

Hrs To Srvc=0000 

02/01/00 00:00:00 

Press 5 

Press and to scroll 

up and down logged alarms. 

SETTINGS 

0)Clock 1)Mode 

2)Settings 3)Modem 

4)DLogger 5)Erase DL 

Press 3 Press 4 Press 5 

Press 2 

Press 1 

Press 0 

DATA LOGGER INTERVAL 

[Up]/[Down]=Interval 

[->] to select 

>>10 minutes

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