S – 150 Controller User Manual
MKTF – 429-A 10 08/16
Pretreat Switch
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 pretreatment 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.
I/O Expander Board
If the optional I/O expander board is installed, two additional relay outputs and one 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.
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. 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.
Relay 2 outputs can be selected to operate as an auxiliary pump output, a divert output or an alarm
output by programming the Expander Mode Setpoint. Table 2 shows the values used to program the
relay outputs.
TABLE 2. Expander Mode Programming
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