Heat Controller Water Source Heat Pump 3.2.3Binary Output, 3.2.4Relay Expansion Board - Outputs

WattMaster WHP Section 4

3.2.3Binary 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.

3.2.4Relay 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.

3.2.5Analog 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.

Start-Up and Troubleshooting 4-11