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ULTRA HIGH EFFICIENCY
POWER VENT/POWER DIRECT VENT
SERVICE MANUAL
Technical Literature Department ©2008
TABLE OF CONTENTS
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
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