Heat Controller Water Source Heat Pump manual Communications Loops, WattMaster WHP, Section

WattMaster WHP Section 2

Communications Loops

The Communications Loop is two wire shielded RS-485. The loop is best connected in daisy chain configuration, meaning the loop is connected from one controller to another. It is not necessary to sequentially address the WHP Controllers in relation to their location on the loop. Cable must be Belden No. 82760 or equivalent.

Tip: Incorrect wiring of the communications loop is the most common mistake made during installation. Before beginning installation, write down the wire color used on each terminal connection and consistently maintain that color code. It is recommended that a continuous wire run be made between devices. Anytime a splice is made in the cable you increase your chance of problems.

Caution: Make sure when you are inserting wires into the terminal blocks that strands of wire do not stick out and touch the next terminal. This could cause a short or erratic operation.

Installation and Wiring 2-3