Table Of Contents - State Water Heaters GP650 HTPDT Service Handbook

INTRODUCTION ............................................................ 2
Qualifications ............................................................ 2
Service Warning ....................................................... 2
Important Service Reminder ..................................... 2
Instruction Manual .................................................... 3
Tools Required.......................................................... 3
INSTALLATION CONSIDERATIONS ............................. 4
Closed Water Systems ............................................. 4
Thermal Expansion................................................... 4
Air Requirements ...................................................... 5
Contaminated Air ...................................................... 5
Venting...................................................................... 6
Electrical Requirements............................................ 8
OPERATION & SERVICE............................................... 9
How it works ............................................................. 9
Blower..................................................................... 10
Burner......................................................................11
Venturi .................................................................... 14
Gas Valve ............................................................... 15
Gas Pressure Testing ............................................. 16
Air Pressure Switches ............................................ 18
Air Pressure Switch Operation ............................... 20
Air Pressure Switch Testing.................................... 21
Flame Sensing Test ................................................ 24
Igniter Current Test ................................................. 25
CONTROL SYSTEM..................................................... 26
Introduction............................................................. 26
UIM ......................................................................... 27
Discreet Menu - Contact Information ............... 28
Operating Set Point Adjustment ............................. 32
Control System Menus ........................................... 33
CCB ........................................................................ 35
Socket Identification ......................................... 36
Wiring Diagram....................................................... 39
Sequence of Operation........................................... 40
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TABLE OF CONTENTS

TROUBLESHOOTING...................................................41
Rough Start - Rough Operation ............13 and 41
Heater Status Menu ..........................................33
Things to Check Before Servicing ....................41
Reset Procedure...............................................41
Control System Unresponsive.................................42
Blank Display ....................................................42
UIM Inoperable .................................................42
Fault Messages.......................................................43
AC Reversed ....................................................43
Upper Probe Open............................................43
Upper Probe Short............................................44
Flame Probe Short............................................44
Flame Detect Error ...........................................45
Energy Cut Out (ECO)......................................45
Blocked Inlet .....................................................46
Blocked Exhaust Vent.......................................47
Blower Prover Failure .......................................47
Blower Prover Open - Blower Not Running ......48
Blower Prover Open - Blower Is Running .........48
Low Igniter Current ...........................................49
Ignition Failure ..................................................50
Gas Valve Failure .............................................52
Communication Failure.....................................52