Installation and Service Manual – L Series Reverse Osmosis System
Systems and Components
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Switch Inputs
Switch inputs are connected to P2. The connections for these inputs are not polarity sensitive and can be connected to
either terminal. The switch inputs should be dry contact closures only. CAUTION: Applying voltage to these terminals will
damage the controller. The switches can be either normally open or normally closed, but all switches must be the same. If
the controller is set for normally open switches, all switches must be open for the unit to run. If the controller is set for
normally closed switches, all switches must be closed for the unit to run. NOTE: J10 selects normally open or normally
closed operation. When J10 is in the A position, the unit is configured for normally open switches. When J10 is in the B
position, the unit is configured for normally closed switches.
Pressure Fault Switch
On systems where a low feed pressure shut down is required, a feed pressure switch can be connected to the pressure
fault input of P2. If a high pump pressure shut down is required, a high pressure switch can be connected to this input. If
both low feed pressure and high pump pressure shut down are required, both switches can be connected to this input.
Both switches must be either normally open or normally closed to operate properly.
Pretreat Switch
In systems with pretreatment, a pretreat lockout switch can be connected to the pretreat input of P2. This switch should
operate when the pretreatment device is out of service. NOTE: The output from the pretreatment device must be a dry
contact and must not supply voltage.
Tank Full Switch
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.
