2
TABLE OF CONTENTS
IMPORTANT SAFETY INFORMATION ..........................3
REQUIREMENTS & CODES ..........................................4
Combustion Air Quality ................................................5
Heating Load ................................................................5
Installation in a Garage ................................................6
Clearances to Combustible Materials ..........................6
Operation of Furnace During Construction ..................6
COMBUSTION AIR & VENTING REQUIREMENTS .......7
Direct Vent Furnaces ....................................................8
Conventional Vent Systems - Confined Spaces ..........8
Air From Inside .........................................................8
Outdoor Air from a Crawl Space or Vented Attic .......8
Outdoor Air Using Vertical Ducts ..............................8
Outdoor Air Using Horizontal Ducts ..........................9
Air Directly Through An Exterior Wall ........................9
Alternate Method of Providing Air from Outside .......10
Conventional Vent Systems - Unconfined Spaces ......10
Category IV Venting .....................................................10
Vent Pipe Material .....................................................11
Vent Pipe Length & Diameter ...................................11
Vent Pipe Installation ................................................11
Outdoor Terminations - Horizontal Venting ...............12
Outdoor Terminations - Vertical Venting ....................13
Vent Freezing Protection ...........................................13
Existing Installations .................................................13
Condensate Disposal ...................................................13
CIRCULATING AIR REQUIREMENTS ...........................14
Plenums & Air Ducts ....................................................14
Return Air Connections ................................................14
Upflow & Horizontal Furnaces ..................................14
Downflow Furnaces ..................................................15
Supply Air Connections ................................................15
Acoustical Treatments ..................................................15
FURNACE INSTALLATION ............................................15
General Requirements .................................................15
Upflow Furnaces ..........................................................15
Horizontal Furnaces .....................................................15
Special Instructions for GUH92A038A3XE
Furnaces ...................................................................16
Downflow Furnaces ......................................................16
Installation on a Concrete Slab .................................17
Inducer & Venting Options ...........................................17
Inducer Assembly Rotation .......................................18
Pressure Switch Tubing ............................................18
Alternate Pressure Switch Location ..........................18
Accessories ..................................................................19
Finish Flange ............................................................19
Rubber Grommets ....................................................19
PVC Components .....................................................20
Typical Orientation ................................................20
Alternate Orientation ............................................20
Optional PVC Pipe Installation ..................................20
Condensate Drain Lines ...........................................20
Bottom Panel Removal.................................................21
Alternate Bottom Panel Removal .................................21
GAS SUPPLY & PIPING .................................................22
Leak Check ..................................................................22
High Altitude Application (Natural Gas Only) ...............22
Converting from Natural Gas to LP / Propane .............23
ELECTRICAL WIRING ....................................................26
Line Voltage Wiring ......................................................26
Grounding .....................................................................26
Thermostat / Low Voltage Connections .......................26
Heat Anticipator ............................................................26
Twinning .......................................................................27
START-UP & ADJUSTMENTS ........................................28
Pre-Start Check List .....................................................28
Start-up Procedures .....................................................28
Verifying & Adjusting Input Rate ..................................29
Verifying & Adjusting Temperature Rise ......................29
Verifying Burner Operation ...........................................29
Verifying Operation of the Supply Air Limit Switch ......29
Configuring The ECM Blower .......................................30
Selecting the (Gas) Heating Speed ..........................30
Determining Nominal System Capacity ....................30
Selecting the Cooling/Heat Pump Speed .................30
System Operation ........................................................30
(Gas) Heating Mode .................................................30
Cooling or Heat Pump Mode ....................................30
Manual Fan ...............................................................30
Fault Conditions ...........................................................30
OPERATING SEQUENCE ..............................................30
Heating Cycle ...............................................................30
Cooling Cycle ...............................................................31
Fan Mode .....................................................................31
MAINTENANCE ..............................................................31
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