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Table of Contents
Furnace Specifi cations ................................................................................................................................. 3, 4
Safety Information ............................................................................................................................................. 4
Installation Requirements ................................................................................................................................. 4
Clearances to Combustible Materials .............................................................................................................. 5
Important Note - Commonwealth of Massachusetts .................................................................................. 4, 5
Location .............................................................................................................................................................. 6
Horizontal Installations ..................................................................................................................................... 6
Conversion of the iQ Drive Upfl ow Furnace for a Horizontal Right Installation .......................................... 6
Conversion of the iQ Drive Upfl ow Furnace for a Horizontal Left Installation ............................................. 7
Circulating Air Supply ....................................................................................................................................... 8
Return Air ................................................................................................................................................... 8
Determining Nominal AC System Capacity ................................................................................................ 8
Selecting the AC Cooling Airfl ow ................................................................................................................ 9
Selecting the Heating Airfl ow ..................................................................................................................... 9
Venting and Combustion Air Requirements ................................................................................................... 9
Air Requirements for One-Pipe Installation .............................................................................................. 10
Installation in An Unconfi ned Space......................................................................................................... 10
Installation in A Confi ned Space .............................................................................................................. 10
• Air From Inside ....................................................................................................................................... 10
• Air Directly Through An Exterior Wall ..................................................................................................... 10
• Outdoor Air Through Vertical Openings or Ducts ................................................................................... 10
• Outdoor Air Through Horizontal Openings or Ducts .............................................................................. 11
Venting Requirements ..................................................................................................................................... 11
Vent Pipe Material .................................................................................................................................... 13
Vent Pipe Length and Diameter ............................................................................................................... 15
Vent Pipe Installation ................................................................................................................................ 15
Pipe Routing & Support ............................................................................................................................ 15
Location of Outdoor Terminations ............................................................................................................ 18
Horizontal Venting ................................................................................................................................... 18
Vertical Venting ......................................................................................................................................... 19
Vent Freezing Protection .......................................................................................................................... 19
Concentric Vent Termination ..................................................................................................................... 20
Drainage of Condensate From Furnace ........................................................................................................ 20
Gas Supply and Piping ................................................................................................................................... 21
Leak Check ............................................................................................................................................. 21
Manifold Pressure Adjustment ................................................................................................................. 22
Conversion ............................................................................................................................................... 22
High Altitude Conversion ................................................................................................................................ 24
High Altitude Application .......................................................................................................................... 24
Pressure Switch Conversion for High Altitude Applications ..................................................................... 24
Natural Gas High Altitude Conversion ...................................................................................................... 24
LP/Propane Gas Sea Level and High Altitude Conversion ...................................................................... 24
Electrical Wiring ............................................................................................................................................... 25
Line Voltage Wiring ................................................................................................................................... 25
Low Voltage Wiring ................................................................................................................................... 25
Start-up and Adjustments............................................................................................................................... 26
Start-Up Procedures ................................................................................................................................ 27
Verifying and Adjusting Firing Rate .......................................................................................................... 27
Selecting the Cooling Airfl ow .................................................................................................................... 28
Verifying and Adjusting Temperature Rise ................................................................................................ 29
Verifying Burner Operation ....................................................................................................................... 29
Verifying Operation of the Supply Air Limit Switch ................................................................................... 29
Wiring Diagram......................................................................................................................................... 31
Description of Components ........................................................................................................................... 30
Maintenance ..................................................................................................................................................... 30
Combustion Air and Vent System ............................................................................................................. 32
Air Filter(s) ................................................................................................................................................ 32
Lubrication ................................................................................................................................................ 32
Location of Major Components ...................................................................................................................... 33
Condensate Drain Assembly .................................................................................................................... 32
Blower Compartment ............................................................................................................................... 32
Heat Exchanger and Burner Maintenance ............................................................................................... 32
System Operation Information ....................................................................................................................... 34
Sequence of Operation ............................................................................................................................ 34
Furnace Fails to Operate .......................................................................................................................... 35
Installation/Performance Checklist ................................................................................................................ 36
