Heat Controller Water Source Heat Pump manual 2.2.5RS-485Communications Connector

WattMaster WHP Section 4

OUT3 - Compressor or Heat 2 - This output enables the compressor if you have configured the WHP Controller for a compressor and reversing valve configura- tion. If the WHP Controller is configured for individual staging of heating and cooling (no reversing valve) then this output enables heating stage 2.

OUT4 - Heat Pump Reset or Cool 1 - This output can be used to reset a com- pressor that has gone off line. If the WHP Controller is configured for individual staging of heating and cooling (no reversing valve) then this output enables cool- ing stage 1.

OUT5 - Aux. Relay or Cool 2 - If you have configured the WHP Controller for a compressor and reversing valve configuration this output can be configured as follows:

1.) Stage 2 for cooling and/or heating mode.

2.) Auxiliary scheduling relay. In this mode it can be programmed to follow an externally broadcast schedule signal.

3.) Auxiliary relay. In this mode it can be used for any function requiring a man- ual user intervention.

4.) Isolation valve. May be used to initiate opening of an isolation valve in case of high loop water pressure even if the WHP Controller is satisfied or in an un- occupied mode. In occupied mode this relay operates in conjunction with the compressor.

If the WHP Controller is configured for individual staging of heating and cooling (no reversing valve) then this output enables cooling stage 2.

COM4-5 - Common 4 and 5. - This ties the common return of the last 2 outputs together. Jumper this terminal to COM1-3 if the unit does not have separate cooling and heating power supplies.

2.2.5RS-485 Communications Connector

This connector provides the connection point for the Local Loop RS-485 communications loop. The wiring consists of a twisted pair of wires with a shield.

T - RS-485 (+) Communications terminal

SHLD - Common return wire, this point is internally tied to GND on the WHP Controller.

R - RS-485(-)Communications terminal

Start-Up and Troubleshooting 4-7