S – 150 Controller User Manual
MKTF – 429-A 11 08/16
Auxiliary Pump
If the Expander Mode Setpoint is programmed to zero or one, 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.
Boost Pump
If the Expander Mode Setpoint is programmed to three or four, 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.
Divert Output
If the Expander Mode Setpoint is programmed to zero or three, 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 Setpoint is programmed to two, 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.
Alarm Output
If the Expander Mode Setpoint is programmed to one, two or four, 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.
Tank Low Switch
A tank low switch input can be connected to the tank low input of P2 on the expander board. This input
will provide a tank low warning on the unit and if the expander is programmed to provide an auxiliary
pump output, will provide low tank level protection for this pump.
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