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Tf:IERMOSTAT...............................................................................................................57
Heat Anticipator Settings .. .. .. . . . . .. .. . .. . .. .. .. .. .. .. . .. . . . . ... .. ... .. .. .. .. .. .... .. .... ..... . .. .. .. . . ..... .. .. . .. 57
ISOLATION RELAY .........................................................................................................58
FURNACE START UP PROCEDURES ....................................................................... 58
To Start the Furnace..................................................................................................58
To Shut Down the Furnace........................................................................................58
Sequence of Operation .. ... .. ...... .. .. .. .. .. ... .. . .. .. ... .. .. . ... .. .... . .. .. .. . .. .. .. . .. . .. . .. .. .. .. .. .. .. .. . . .. . .. 58
Setting Gas Pressure.................................................................................................59
AIR FLOW.......................................................................................................................61
Blower Wiring Connections....................................................................................... 62
Setting the Blower Off Timings.................................................................................. 62
Field Installed Accessory Connections ...................................................................... 63
High Altitude Kits ................................,....................................................................... 63
Electrical Checks........................................................................................................64
FURNACE TWINNING ....................................................................................................66
Honeywell Twinning Instructions .. . ..... . . .. . . ..... .... .. . ....... .... .. .. ............ ..... ... .. .. .............. 66
UTEC Twinning Instructions .......... ..... . . . .. . . .... ....... ....... ........ ..... ... . ........ ... .. .. ............ .. 66
Johnson Controls Twinning Instructions.................................................................... 66
Twinned Furnace Operation...................................................................................... 67
FOSSIL FUEL KITS.........................................................................................................68
Fossil Fuel Kit (RXPF • F01) .......... ....................... ................ ............................... ...... 68
Location and Wiring ...................................................................................................68
Thermostat Operations ............. ............................... ... .. . . . ... . . . .. . . . .. ... . ... .. . .. .. . . . . .. . .. ... . . . 68
Fossil Fuel Kit (RXPF • F02) .... .. ...... ..... ....... ..... ....... ........... ..... .. ... ... ........ .......... ........ 69
MAINTENANCE
Filters.......................................................................................................................... 70
Lubrication..................................................................................................................72
Heat Exchanger.........................................................................................................72
Flame Sensor .............................................................................................................72
Replacement Parts ....................................................................................................72
SERVICE AND TROUBLESHOOTING
INTRODUCTION.............................................................................................................73
TEST EQUIPMENT .........................................................................................................73
INSTALLATION AND SERVICE CHECK LIST ............................................................... 74
Main Power "J" Box....................................................................................................75
Blower Door Switch....................................................................................................75
CONTROL DESCRIPTIONS AND TROUBLESHOOTING
Integrated Furnace Controls with Hot Surface Ignition.............................................. 76
UTEC 1012-920 and Honeywell S9201 E2001 Controls........................................... 76
UTEC 1012-925 Controls .............................. ... .. ............. ............ .... ... ....................... 78
Integrated Furnace Controls with Direct Spark Ignition ............................................. 79
UTEC 1028-927 and JCI G961DAJ-2401 Controls ................................................... 79
IFC Ignition Transformer............................................................................................80
Control Reactions.......................................................................................................81
CONTROLS.....................................................................................................................88
Negative Pressure Switches ......................................................................................88
Induced Draft Blower Negative Pressure Switch.......................................................
88
Drain Pressure Switch ...............................................................................................88
High Altitude Pressure Switch ...................................................................................88
High Limit Control.......................................................................................................89
Heat Assisted Limit Control........................................................................................91
OverTemperatureSwitch ..........................................................................................91
Transformer................................................................................................................ 92
Blower Motor ..............................................................................................................93
Induced Draft Blower Assembly.................................................................................93
Gas Valve...................................................................................................................94
Checking Furnace Input.............................................................................................95
Hot Surface lgniters ...................................................................................................95
Direct Spark lgniters ...................................................................................................96
Remote Flame Sensing Rod ......................................................................................97
Reasons for Burner Lock Out ................. ............ ............... ...... ..................... .... ......... 98
AirFlow......................................................................................................................98
CO and CO2 Levels in the Flue Gases...................................................................... 98
Flue Gas Temperature Range ...................................................................................99
WIRING DIAGRAMS .............................................................................................................100
SERVICE ANALYZER CHARTS ..........................................................................................114
REVIEW QUESTIONS ..........................................................................................................119
INDEX....................................................................................................................................121
INDEX OF FIGURES ............................................................................................................122
INDEX OF TABLES ..............................................................................................................124
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