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 | |