Heat Controller Water Source Heat Pump AcceptableRange, WattMaster WHP, Section, Diagram, Action

These tests assume that the CommLink II is connected and powered, and that all MiniLinks which are connected are also powered.

WattMaster WHP Section 4

5.3.4Checking the MiniLink Network Loop

Diagram

Meter Set To Read DC Volts

The indicated readings are typical of a normally operating system. Actual readings may vary slightly due to the number of units installed and other factors. Any significant devia- tion from these values generally indicates a problem.

Note:Overview

Proper loop voltages are essential for reliable communications. It is normal to see fluctua- tions on an operating communications loop. The average value should be close to the ac- ceptable range described below. Values will vary upon initial powerup for about 15-30 seconds as normal communications occur.

Measurements

LOCALT - G (SHLD)LOOP	2.9 - 3.1 Volts DC	AcceptableRange
R - G (SHLD)	1.9 - 2.1 Volts DC
Action
Readings near ZeroConditionVolts			Check for shortedActionwiring.
If voltages are too high or too low on either			1.	One or more devices connected to this
side				loop may have damaged Comm driver
				chips.
			2.	Wiring errors. Check for multiple loops
				“cross connected”, short circuits, etc.

Start-Up and Troubleshooting 4-27