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TM077: 325 & 410 Series II Heat Pump Service Instructions
Rev 00: Issued April 2014
CONTENTS
INTRODUCTION ................................................................................................................. 3
SAFETY WARNING............................................................................................................. 3
POWER SUPPLY ................................................................................................................ 3
ENVIRONMENTAL .............................................................................................................. 3
HEAT PUMP WATER HEATER MODEL IDENTIFICATION ............................................... 4
HEAT PUMP WATER HEATER MODELS .......................................................................... 5
SPECIFICATIONS ............................................................................................................... 6
PREVENTATIVE MAINTENANCE ...................................................................................... 8
REFRIGERATION TERMS AND THEIR MEANING ............................................................ 9
COMPONENTS AND THEIR FUNCTION ........................................................................... 9
CONTROLLER .................................................................................................................. 11
Power and Tank Sensor Connections ........................................................................ 11
Sensors ...................................................................................................................... 11
Reset Button ............................................................................................................... 12
OPERATION ...................................................................................................................... 13
Refrigerant High Pressure Switch ............................................................................... 17
LED STATUS CODES ....................................................................................................... 18
OPERATIONAL SEQUENCES .......................................................................................... 20
System Start-Up and Standby Mode .......................................................................... 20
Faults .......................................................................................................................... 21
Heat Pump Mode ........................................................................................................ 22
Element Mode – Ambient ........................................................................................... 23
Element Mode – Fault ................................................................................................. 24
Fault 9 – Heating Disabled ......................................................................................... 25
WIRING DIAGRAM ............................................................................................................ 26
REFRIGERATION SYSTEM DIAGRAM ............................................................................ 27
COMMON COMPLAINTS .................................................................................................. 27
SERVICE TECHNICIAN‟S HEAT PUMP KIT ..................................................................... 29
FAULT FINDING ................................................................................................................ 31
Sensors ...................................................................................................................... 48
Refrigerant Charge ..................................................................................................... 54
Electrical Insulation Testing ........................................................................................ 55
COMPONENT REPLACEMENT PROCEDURES ............................................................. 56
Storage Tank .............................................................................................................. 56
Heat Pump Module ..................................................................................................... 62
Refrigeration System .................................................................................................. 66
DOCUMENT REVISION HISTORY ................................................................................... 76
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