2
IMPORTANT SAFETY INFORMATION .......................3
REQUIREMENTS AND CODES ..................................4
Combustion Air Quality .............................................4
Operation of Furnace During Construction ...............4
Installation in a Garage ............................................4
Clearances to Combustible Materials .......................5
Heating
Load
............................................................5
COMBUSTION AIR & VENTING REQUIREMENTS ....6
General
Information
.................................................7
Installation in a Confi ned Space ...............................7
Air From Inside ...................................................7
Outdoor Air from a Crawl Space or
Vented
Attic
........................................................7
Outdoor Air Using Vertical Ducts ........................8
Outdoor Air Using Horizontal Ducts ...................8
Air Directly Through an Exterior Wall .................8
Alternate Method of Providing Air from
Outside
...............................................................9
Installation in an Unconfi ned Space .........................9
Category
I
Venting
....................................................9
Horizontal
Venting
.................................................. 10
Flexible
Vent
Systems
............................................ 10
CIRCULATING AIR REQUIREMENTS ......................11
Plenums & Air Ducts ..............................................11
Supply Air Connections ..........................................11
Upfl ow / Horizontal Furnaces ...........................11
Downfl
ow
Furnaces
..........................................11
Return Air Connections ..........................................11
Upfl ow / Horizontal Furnaces ...........................11
Side Return Installations .............................11
Bottom Return Installations ........................12
Downfl
ow
Furnaces
..........................................12
Acoustical
Treatments
............................................12
FURNACE INSTALLATION ....................................... 12
General
Requirements
........................................... 12
Upfl
ow
Installation
.................................................. 12
Side Return Air Inlet ......................................... 12
Bottom Return Air Inlet ..................................... 12
Downfl
ow
Installation
.............................................. 12
Installation on a Concrete Slab ........................ 13
Horizontal
Installation
............................................. 13
Pressure
Switches
................................................. 14
Bottom Panel Removal ........................................... 14
Alternate Bottom Panel Removal ..................... 14
GAS SUPPLY & PIPING ............................................15
Leak Check ...........................................................15
High-Altitude
Application
........................................16
Conversion to LP / Propane ...................................18
ELECTRICAL WIRING ...............................................18
Line Voltage Wiring ................................................19
Grounding
..............................................................19
Thermostat / Low Voltage Connections .................19
Single Stage AC & Single Stage Heat
Thermostat
.......................................................20
Single Stage AC & Two - Stage Heat
Thermostat
.......................................................20
Two - Stage AC & Two - Stage Heat
Thermostat
.......................................................20
Autostaging for Single Stage Thermostats .............20
Autostaging for Two-Stage Thermostats ................21
Heat
Anticipator
......................................................21
Dehumidifi
cation
Options
.......................................21
Blower Speed Confi guration ...................................21
Fixed Speed Blowers ........................................21
Variable Speed Blowers ....................................21
START-UP & ADJUSTMENTS ...................................22
Pre-Start
Checklist
.................................................22
Start-Up
Procedures
..............................................22
Verifying & Adjusting Input Rate ............................22
Verifying & Adjusting Temperature Rise .................23
Verifying Burner Operation ....................................23
Verify Operation of the Supply Air Limit Switch ......23
OPERATING SEQUENCE .........................................23
Heating
Cycle
.........................................................23
Cooling
Cycle
.........................................................24
Fan
Mode
...............................................................24
MAINTENANCE .........................................................24
Air Filters ................................................................25
Blower
Compartment
.............................................25
Cleaning of Burners ...............................................25
Cleaning of Flue Passages ....................................25
Heat Exchanger & Burner Maintenance .................26
Lubrication ..............................................................26
Vent
System
...........................................................26
DESCRIPTION OF COMPONENTS ..........................26
TROUBLESHOOTING ...............................................27
TABLE OF CONTENTS
