2
Table of Contents
GAS FURNACE SAFETY PRECAUTIONS ....................................3
Additional Safety Considerations.................................................4
PRODUCT DESCRIPTION AND APPLICATION ..........................4
Shipping Inspection .....................................................................4
Electrostatic Discharge (ESD) Precautions..................................4
To The Installer.............................................................................5
Important Note to the Owner Regarding Product Warranty .......5
Product Application......................................................................5
LOCATION REQUIREMENTS AND CONSIDERATIONS ............6
Clearances and Accessibility .......................................................7
Furnace Suspension ....................................................................7
Existing Furnace Removal ...........................................................7
Thermostat Location ....................................................................8
COMBUSTION AND VENTILATION AIR REQUIREMENTS........8
Category I Venting—Vertical Venting...........................................8
Category I Furnaces Only—Exterior Masonry Chimneys............9
ELECTRICAL CONNECTIONS ....................................................13
Wiring Harness ...........................................................................13
115-Volt Line Connections.........................................................13
Junction Box Relocation ............................................................13
24-Volt Thermostat Wiring .........................................................14
24-Volt Dehumidistat Wiring ......................................................15
Fossil Fuel Applications .............................................................15
115-Volt Line Connection of Accessories (Humidifier and
Electronic Air Cleaner)................................................................16
GAS SUPPLY AND PIPING..........................................................16
High Altitude Derate ...................................................................17
Propane Gas Conversion...........................................................17
Gas Piping Connections ............................................................17
Propane Gas Tanks and Piping .................................................19
CIRCULATING AIR AND FILTERS..............................................20
Ductwork—Airflow .....................................................................20
Filters—Read this Section Before Installing the Return Air
Ductwork ....................................................................................20
START-UP PROCEDURE AND ADJUSTMENT .........................21
Heat Anticipator Setting.............................................................21
Furnace Operation .....................................................................21
Furnace Start-Up .......................................................................21
Furnace Shutdown .....................................................................21
Gas Supply Pressure Measurement ..........................................21
Gas Manifold Pressure Measurement and Adjustment.............23
Gas Input Rate Measurement—Natural Gas Only.....................23
Temperature Rise .......................................................................24
Circulator Blower Speeds ..........................................................24
Blower Heat Off Delay Timings ..................................................27
NORMAL SEQUENCE OF OPERATION .....................................27
Power Up....................................................................................27
Heating Mode.............................................................................27
Cooling Mode .............................................................................27
Fan Only Mode ...........................................................................28
Operational Checks....................................................................28
SAFETY CIRCUIT DESCRIPTION ...............................................28
Integrated Control Module .........................................................28
Primary Limit Control..................................................................28
Auxiliary Limit Controls...............................................................28
Rollout Limit Controls.................................................................28
Pressure Switches......................................................................28
Flame Sensor..............................................................................28
MAINTENANCE ............................................................................29
Annual Inspection.......................................................................29
Filters ..........................................................................................29
Burners .......................................................................................29
Induced Draft and Circulator Blowers........................................29
Condensate Trap and Drain System (Qualified Servicer Only)..29
Flame Sensor (Qualified Servicer Only)......................................29
Flue Passages (Qualified Servicer Only) ....................................30
Before Leaving an Installation ....................................................30
Repair and Replacement Parts ..................................................30
TROUBLESHOOTING ..................................................................30
Electrostatic Discharge (ESD) Precautions................................30
Fault Recall .................................................................................30
Resetting from Lockout..............................................................30
Status Codes..............................................................................31
Diagnostic Chart.........................................................................31
WIRING DIAGRAM .......................................................................38
ASSISTANCE OR SERVICE .........................................................39
