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WattMaster WHP Section 4
Start-Up and Troubleshooting 4-11
3.2.3 Binary Output
R1 – Compressor Enable – Energizes the first stage of cooling.
R2 – Main Pump – Energizes the lead water pump.
R3 – Standby Pump – Energizes the standby pump if the main pump fails to
start.
R4 – Alarm Indicator – Energizes when an alarm occurs on the Loop Controller.
R5 – Not Used – This output is not used.
COM 1-3 - Common – 24 VAC from the AHU is connected to this terminal and
is the common for inputs 1 through 3.
COM 4-5 - Common – 24 VAC from the AHU is connected to this terminal and
is the common for inputs 4 and 5.
3.2.4 Relay Expansion Board - Outputs
This connector carries the output relay dry contact open/closed signal.
Relays 1-4 - Heat Addition/Rejection Stages - Can be configured to be used for
either stages of heating or cooling of water when required.
Relays 5-8 - Heat Addition/Rejection Stages – Same as above, can be used for
heating or cooling of the water.
3.2.5 Analog Input Expansion Board
The following inputs use dry contact open/closed signals.
AIN1 – Fire Alarm Contact - Used to shut down all equipment in case of a
smoke or fire condition.
AIN2 - Request to Run - Used to initiate system start when a water source heat
pump controller other than the WattMaster WHP Controller is used.
Warning: Fire Alarm Contact input must be connected to the AIN1- GND
terminal if it is not used, a jumper must be connected between AIN1
and GND, since this is a normally closed contact input. If this is not
done the system will not operate.