Troubleshooting Guide -
Tranquility
®
Digital (DXM2) Packaged Units
Rev.: 01/15/14
36
Geothermal Heat Pump Systems
Verifying DC Voltage on DXM2 Board
for Modulating Valve Check
A-X
Off On
A
OVR
Acc1
Relay
Acc2
Relay
H
COM
NC1
NO1
COM
NC2
NO2
P3
R
R
S1
Factory Use
COH
COM
AO2
P11
Gnd
T1 T2 T
A0-
Off On
S3
1 2 3 4
1 2 3 4 5 6 7 8
You should see 3.3-10 Volts A/C D/C when valve is
functioning properly.
The voltage relates to the valve position:
Valve 0% Open = 3.30 VDC
Valve 50% Open = 5.00 VDC
Valve 100% Open = 10.00 VDC
Valve gets 24 AC volts here.
Note: This check is the output
to the valve from the DXM2.
Red
Black
White
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