Residential Packaged
DIGITAL Geothermal
Heat Pumps
97B0601N01
Rev.: 01/15/14
Tranquility
®
Digital (DXM2)
Troubleshooting Guide
Table of Contents
Introduction 2
Troubleshooting Flow Chart 3-9
Flow Chart Reference Symbols and Diagrams 10
Contactor Chart 11
Verifying Pump Feedback Signal 11
Removing Powerhead on Modulating Valve 12-13
Checking Compressors 14-15
Reversing Valve Touch Test Chart 16
Performance Troubleshooting 17-18
Functional Troubleshooting 19-21
Commissioning Worksheet: 22-23
Typical Water Source Refrigeration Circuit 24
(Heating Cycle)
Basic Refrigeration Summary 25
Refrigeration Troubleshooting 26-27
Auxiliary Heat Check 28
Checking Pump Output 28
Compressor Contactor Voltage Check 29
Check CCH for 24 Volts 29
Verifying Contactor 29
Verifying Capacitor 30
Checking Pump Power Cord 30
Replacing Variable-Speed Pump Power Head 31
Verifying Power at Molded Plug 31
for Compressor
Verifying Antifreeze 32
Second Stage Verifi cation 33
Verifying 24V at Reversing Valve 34
Checking Reversing Valve at DXM2 34
A0-2 Jumper 35
Checking for Power at DXM2 35
Verifying DC Voltage on DXM2 Board 36
for Modulating Valve Check
TXV Bulb Test 37
Verifying Dipswitch Position 38
Replacing High Pressure Water Switch 38
Verifying a Thermistor 39-40
Turning Breaker on in Panel 41
or Aux Heat Control
Static Pressure Check 41
Locating Tstat Version and DXM2 Version 42
UltraCheck EZ
™
Motor Diagnostic Tool 42
Checking Dipswitches on DXM2 43
Magnet Test to Shift Reversing Valve 43
Checking Blower Line Voltage 44
Modulating Valve Loses Confi guration 44
Hard Reset at Thermostat 45
Defi nitions of Conditions 46-47
DXM2 Board Layout and Dipswitches 48
DXM2 Controls 49-52
Wiring Diagrams 53-54
ATC Thermostat Screens and Set Up 55-61
Revision History 62
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