USF RO ManualOMRX_6.pdf

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RX Manual 04/04 Rev. 6 TROUBLESHOOTING 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 200 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. 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. NOTE: Contact your local USFilter representative for assistance when the RO system requires cleaning. 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. USFilter 5-2
RX Manual 04/04 Rev. 6 TROUBLESHOOTING 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 the 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.) 5.9 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 250 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. NOTE: Contact your local USFilter representative for assistance when the RO system requires cleaning. 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
Page 1 and 2: USFilter 10 Technology Drive Lowell
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Page 5 and 6: TABLE OF CONTENTS SECTION DESCRIPTI
Page 7 and 8: For Product and Service Information
Page 9 and 10: RX Manual 04/04 Rev. 6 INTRODUCTION
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