Table of Contents
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SAFETY INFORMATION .............................................5
REQUIREMENTS AND CODES ..................................5
GENERAL INSTRUCTIONS ........................................6
Combustion Air Quality ............................................6
Operation of Furnace During Construction ..............6
Installation in a Garage ............................................7
Heating Load ...........................................................7
Clearances to Combustible Materials ......................7
COMBUSTION AIR REQUIREMENTS ........................7
General Information .................................................7
Conventional Furnaces - Confi ned Spaces .............8
Outdoor Air Using Vertical Ducts ........................8
Outdoor Air Using Horizontal Ducts ....................8
Vented Attic .........................................................8
Air Directly Through an Exterior Wall .................8
Outside ...............................................................9
Air From Inside ....................................................9
Direct Vent Furnaces .............................................10
VENTING REQUIREMENTS ......................................11
Vent Pipe Material .................................................11
Vent Pipe Length and Diameter .............................11
Vent Pipe Installation .............................................12
Outdoor Terminations - Horizontal Venting ............12
Outdoor Terminations - Vertical Venting .................12
Vent Freezing Protection .......................................13
Condensate Disposal ............................................13
Existing Installations ..............................................14
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FURNACE INSTALLATION .......................................14
General Requirements ..........................................14
Vent and Inducer Assembly Options .....................14
Inducer Assembly Rotation ...................................14
Pressure Switch Relocation ..................................15
Furnaces ..........................................................15
Condensate Drain Lines ........................................16
Direct Vent (2 - Pipe) Applications ........................16
Upfl ow Installation .................................................16
Side Return Air Inlet ........................................16
Bottom Return Air Inlet ....................................16
Horizontal Installation ...........................................16
Bottom Panel Removal ....................................17
Downfl ow Installation ............................................17
Installation on a Concrete Slab ..........................18
CIRCULATING AIR REQUIREMENTS ......................18
Plenums and Air Ducts ..........................................18
Supply Air Connections ........................................19
Upfl ow/Horizontal Furnaces ............................19
Downfl ow Furnaces .........................................19
Return Air Connections ........................................19
Upfl ow/Horizontal Furnaces ..............................19
Downfl ow Furnaces ...........................................19
Acoustical Treatments............................................19
GAS SUPPLY AND PIPING .......................................20
Leak Check .........................................................20
High-Altitude Application ......................................20
Conversion to LP/Propane ...................................21
Side Return Installations ..............................19
Bottom Return Installations ..........................19
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