Heat Controller Water Source Heat Pump 3.2.6Comm Connector - Communications, 3.2.7Power Terminal

WattMaster WHP Section 4

3.2.6Comm Connector - Communications

RS-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

3.2.7Power Terminal

This connector provides power to the Loop Controller

24 VAC - Connect to the “HOT” side of the control transformer.

GND - The grounded side of the control transformer. If the secondary of the con- trol transformer is not grounded, you must still observe polarity if the trans- former powers any other device!

Warning: Connect only the GND terminal to the grounded side of a transformer

Failure to properly observe polarity will result in damage to the system. Observe polarity at all points in the system.

4-12 Start-Up and Troubleshooting