Operation and Maintenance Manual for

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)
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