WP440L-Series Reverse Osmosis System
Installation Instructions and User Manual
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I/O Expander Board
With the I/O expansion board 2 additional relay outputs and 1 additional switch input are provided. Refer to figure 4 for the
location of terminal strips, jumpers and wiring for this board. AC power for the relays is connected to the L1 and L2 power
terminals of P1. Relay 1 is connected to this power input and will supply the same voltage. This relay is rated for
120/240VAC at 1HP maximum. Relay 1 can be configured to supply a dry contact by connecting a jumper wire between
the L1 and L2 power terminals of P1.
Jumpers J1-J4 are used to select the relay 2 output type. To output voltage, a wire jumper is installed between J1 and J4
and a second wire jumper is installed between J2 and J3. For a contact closure output, a single wire jumper is installed
between J3 and J4. The 2 relay outputs can be selected to operate as an auxiliary pump output, a divert output or an
alarm output by programming the Expander Mode Set-point.
Note: If Relay 1 is configured as a dry contact, Relay 2 must be configured as a dry contact also.
If Relay 1 is configured to supply voltage, Relay 2 can be selected to supply voltage, 120/240, 5A maximum,
or as a dry contact output.
Table 3 - Values to Program the Relay Outputs
Expander Mode
RELAY 1
RELAY 2
0
Auxiliary Pump
Divert
1
Auxiliary Pump
Alarm
2
Divert
Alarm
3
Boost
Divert
4
Boost
Alarm
If the Expander Mode Set-point is programmed to 0 or 1, relay 1 operates as an auxiliary pump output. This output is
energized when the tank low input is not active. This output will supply power, or a contact closure determined by the
connections L1 and L2 of the terminal strip P1.
If the Expander Mode Set-point is programmed to 3 or 4, relay 1 operates as a boost pump output. This output is
energized when the inlet solenoid output is active. This output will supply power, or a contact closure determined by the
connections L1 and L2 of the terminal strip P1.
If the Expander Mode Set-point is programmed to 0 or 3, relay 2 operates as a divert relay and will operate whenever the
unit is in the divert mode. This output will supply voltage or provide a contact closure based on the configuration of relay 1
and on the position of jumpers J1-J4.
If the Expander Mode Set-point is programmed to 2, relay 1 operates as a divert relay and will operate whenever the unit
is in the divert mode. This output will supply power, or a contact closure determined by the connections L1 and L2 of the
terminal strip P1.
If the Expander Mode Set-point is programmed to 1, 2 or 4, relay 2 operates as an alarm relay. When an alarm or warning
is active, this relay will supply voltage or provide a contact closure based on the configuration of relay 1 and the position of
jumpers J1-J4.
Auxiliary Pump
Boost Pump
Divert Output
Alarm Output
