WP440L-Series Reverse Osmosis System
Installation Instructions and User Manual
Page | - 13 -
The RO pump connects to L1 and L2 RO pump terminals of P1. This output can operate 120/240VAC motors up to 1HP
directly. For motors larger than 1HP or for 3 phase motors, this output is used to operate a contactor.
The inlet and flush valves must operate at the same voltage as supplied to the board. These outputs can supply 5A
maximum and are not designed to operate pump motors directly. If these outputs are to be used to operate a boost or
flush pump, the output should be used to operate a motor contactor. The inlet valve connects to L1 and L2 inlet terminals.
The flush valve connects to L1 and L2 flush terminals of P1.
The cell is connected with 5 wires to terminal strip P10. Each colored wire will be connected to the terminal labeled with
the same color
.
CAUTION: Applying voltage to these terminals will damage the controller.
Switch inputs are connected to P9. 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. The switches can be either normally open or normally
closed in any combination. The switch connected to an input that is configured as normally open must be open for the unit
to run.
The switch connected to an input that is configured as normally closed must be closed for the unit to run. The Switch Select
Set-point allows each input to be configured as normally open or normally closed. The Switch Select Set-point is defaulted
to 0 which programs all inputs as normally open. This means that all switch inputs must be open for the unit to run.
A feed pressure switch is connected to the pressure fault input of P9. 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.
In systems with pretreatment, a pretreat lockout switch can be connected to the pretreat input of P9. This switch should
operate when the pretreatment device is out of service.
Note: The output from the pre-treatment device must be a dry contact and must not supply voltage
.
Tank Full Switch
In systems with a single tank level switch for controlling the RO pump, the level switch connects to the tank full high input
of P9. If dual level switches are used for controlling the RO pump, the upper-level switch connects to the tank full high input
of P9 and the lower-level switch connects to the tank full low input of P9.
Inlet and Flush Valve Wiring
TDS Cell Installation and Wiring
Switch Inputs
Pressure Fault Switch
Pretreat Switch
