Heat Controller Water Source Heat Pump 5.4Troubleshooting Loop Controller, Meter, WattMaster WHP

The Loop Controller must be pow- ered for these tests.

WattMaster WHP Section 4

5.4Troubleshooting Loop Controller

5.4.1Checking the Loop Controller Analog Inputs

Diagram

Overview

SET METER TO

READ DC VOLTS

+

- +

-

ALL READINGS ARE TAKEN

WITH THE (-) LEAD OF THE

METER ON THE GND

TERMINAL

Measurements

Meter

AIN1

Return Water Temp

AIN2

Supply Water Temp

AIN3

Proof of Flow

	The analog input wiring can be checked at the
	Loop Controller by checking voltages on the
	Analog Input Connector.
	If any of the RWT, SWT, OAT inputs read
	greater than 5.0 volts then it is OPEN (no
12V	sensor is connected), an input that reads less
	than 0.1 volts is SHORTED. Check for wiring
AIN1
AIN2	problems before proceeding.
AIN3
AIN4
AIN5	The Loop Pressure, Manual Reset, Phase
GND
GND	Loss, Fire Alarm and Request to Run inputs
AOUT1	should read greater than 5.0 volts if the at-
AOUT2
AIN7	tached contact is OPEN and less than 0.5 volts
GND
	if the contact is CLOSED (contacts CLOSE
	between the input and GND). The Fire Alarm
	and Request to Run contacts are located on
	the Analog Input Expansion Board.

Ignore readings for NoteanyAcceptableconnectionsRangewhich are not used in the equipment.

1.9 volts (100°F) - 3.6 volts (40°F) Typical is 2.5 volts @ 77°F

1.9 volts (100°F) - 3.6 volts (40°F) Typical is 2.5 volts @ 77°F

When used with the Low Pressure Switch option:

If the input is OPEN, the voltage will be greater than 5.0 volts

If the input is CLOSED, the voltage will be less than 0.5 volts

When used with 0-50 PSI Loop Pressure Sensor option:

5.1 VDC = 50 PSI – 0.0 VDC = 0 PSI

Start-Up and Troubleshooting 4-35