Installation and Service Manual – L Series Reverse Osmosis System
Systems and Components
Membranes
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Filters
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Chemicals
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Pressure Fault
If the pressure fault input is active for 2 seconds, a pressure fault condition will occur. This will cause the controller to shut
down. PF will show on the water quality display and the status lamp will flash red. To clear the pressure fault, press the
power key twice.
PF Auto Reset/PF Retry
With J8 in the A position, the power must be cycled using the Power key to clear a pressure fault shut down. A PF auto
reset function is enabled by placing J8 in the B position. When a pressure fault occurs with the PF auto reset enabled, the
controller will automatically reset after a 60 minute delay and the controller will start. If the pressure fault has cleared, the
controller will continue to run. If the pressure fault condition is still active, the controller will again shut down for the
pressure fault condition and the auto reset cycle will repeat. During the auto reset delay, the water quality display will
show PF and the status lamp will be off.
A PF retry function is enabled by placing J8 in the C position. When a pressure fault occurs with the PF retry enabled, the
controller will shut down for 30 seconds and then attempt to restart. If the pressure fault is still active, the controller will
shut down for 5 minutes and then attempt to restart. If the pressure fault is still active, the controller will shut down for 30
minutes and attempt to restart. If the pressure fault is still active, the controller will lockout for the pressure fault. During
the retry delays, the water quality display will show PF and the status lamp will be a steady red. If during one of the retries,
the controller is able to start and run continuously for 10 seconds, the retry function is reset. If a pressure fault occurs, the
PF retry cycle will repeat from the beginning.
When J8 is in the D position, both the PF auto reset AND the PF retry functions are enabled. If a pressure fault condition
occurs, the PF retry function will operate as described above. If the retry function locks out, the PF auto reset function will
operate as described above. The PF retry and PF auto reset functions will continue in a 30 second, 5 minute, 30 minute
and 60 minute cycle until the pressure fault condition clears.
Tank Full
For 2 level switch operation, the upper switch is connected to the tank full input and the lower switch is connected to the
tank full low input. When both switches are clear, the RO unit will run. The RO unit will continue to run when the water
level rises and the lower switch becomes active. When the upper switch becomes active, after the 5 second delay, the RO
unit will shut down. FUL will show on the display. When the tank level drops and the upper level switch clears, the status
LED will began to flash and the RO unit will remain off. When the lower level switch clears, the LED will go off, and the
RO will restart.
Pretreat Lockout
If the pretreat lockout input is active for 2 seconds, the controller will shut down for a pretreat lockout condition. The water
quality display will show PL. When the pretreat lockout condition clears, the unit will restart.
Membrane Flush
A feed water flush takes place every time the system shuts down in a Tank Full condition. With the pump off, the inlet
valve opens for 5 minutes.
Water Quality Display
The water quality display shows the current water quality when the controller is operating normally and status messages
when the controller is shut down. The water quality display is 0 - 999PPM. If the water quality is above 999, the display
will show “^ ^ ^”. If the water quality is below the setpoint, the water quality lamp will be green. If the water quality is above
the setpoint, the water quality lamp will be red.
