2
TABLE OF CONTENTS
GAS FURNACE SAFETY PRECAUTIONS ....................................3
Electrostatic Discharge (ESD) Precautions..................................4
PRODUCT DESCRIPTION AND APPLICATION ..........................4
Shipping Inspection .....................................................................4
To The Installer.............................................................................4
Important Note to the Owner Regarding Product Warranty .......4
Component Identification.............................................................5
Product Application......................................................................5
LOCATION REQUIREMENTS AND CONSIDERATIONS ............6
Clearances and Accessibility .......................................................7
Furnace Suspension ....................................................................8
Existing Furnace Removal ...........................................................8
Thermostat Location ....................................................................8
COMBUSTION AND VENTILATION AIR REQUIREMENTS........8
INSTALLATION POSITIONS.......................................................11
HORIZONTAL APPLICATIONS AND CONSIDERATIONS........11
General .......................................................................................11
Drain Trap and Lines ..................................................................11
Leveling ......................................................................................11
Alternate Vent/Flue Connections ...............................................11
Alternate Electrical and Gas Line Connections .........................13
Drain Pan....................................................................................13
Freeze Protection .......................................................................13
Furnace Suspension ..................................................................13
PROPANE GAS/HIGH ALTITUDE INSTALLATIONS .................13
VENT/FLUE PIPE AND COMBUSTION AIR PIPE......................13
General .......................................................................................13
Dual Certification: Nondirect/Direct Vent...................................14
Materials and Joining Methods..................................................14
Proper Vent/Flue and Combustion Air Piping Practices ...........14
Termination Locations................................................................14
Canadian Venting Requirements ...............................................15
Standard Furnace Connections.................................................15
Vent/Flue Pipe ............................................................................15
Combustion Air Pipe—Direct Vent Installations ........................15
Combustion Air Pipe—Nondirect Vent Installations..................16
Alternate Furnace Connections .................................................16
Alternate Vent/Flue Location......................................................16
Nondirect Vent (Single Pipe) Piping...........................................18
Vent/Flue Pipe Lengths and Diameters .....................................18
Vent/Flue Pipe Terminations ......................................................18
Direct Vent (Dual Pipe) Piping ....................................................19
Vent/Flue and Combustion Air Pipe Lengths and Diameters....19
Vent/Flue and Combustion Air Pipe Terminations ....................20
Vent/Intake Terminations for Installation of Multiple
Direct Vent Furnaces..................................................................21
Concentric Vent Termination .....................................................22
Side Wall Vent Kit.......................................................................22
CONDENSATE DRAIN LINES AND DRAIN TRAP .....................22
Standard Right or Left Side Drain Hose Connections...............22
Upright Installations—Trap on Right Side .................................22
Upright Installations—Trap on Left Side....................................23
Upright Drain Trap Mounting—Left or Right Side Panel ...........24
Horizontal Installations—Right Side Down................................24
Horizontal Installations—Left Side Down ..................................24
Horizontal Drain Trap Mounting—Left or Right Side Panel.......25
ELECTRICAL CONNECTIONS ....................................................25
Wiring Harness ...........................................................................25
115-Volt Line Connections.........................................................25
Junction Box Relocation ............................................................26
24-Volt Thermostat Wiring .........................................................26
WFM19 Furnace with 2-Stage Condenser Field Wiring............26
115-Volt Line Connection of Accessories (Humidifier and
Electronic Air Cleaner)................................................................27
GAS SUPPLY AND PIPING ..........................................................28
High Altitude Derate ...................................................................28
Propane Gas Conversion ...........................................................28
Gas Control Valve.......................................................................28
Gas Piping Connections ............................................................28
Gas Piping Checks.....................................................................31
Propane Gas Tanks and Piping .................................................31
CIRCULATING AIR AND FILTERS ..............................................32
Ductwork—Airflow .....................................................................32
Checking Duct Static .................................................................33
Bottom Return Air Opening—Upflow Models] ..........................33
Filters—Read This Section Before Installing the Return Air
Ductwork ....................................................................................33
START-UP PROCEDURE AND ADJUSTMENT .........................35
Heat Anticipator Setting .............................................................35
Drain Trap Priming......................................................................35
Furnace Operation......................................................................35
Furnace Start-Up........................................................................35
Furnace Shutdown .....................................................................35
Gas Supply Pressure Measurement ..........................................35
Gas Manifold Pressure Measurement and Adjustment.............37
Gas Input Rate Measurement—Natural Gas Only.....................37
Temperature Rise .......................................................................37
Circulator Blower Speeds ..........................................................38
NORMAL SEQUENCE OF OPERATION .....................................38
Power Up....................................................................................38
Heating Mode—Mode DIP Switch Set to 1 STG Position.........38
Heating Mode—Mode DIP Switch Set to 2 STG Position.........39
Cooling Mode .............................................................................39
Fan Only Mode ...........................................................................39
Operational Checks....................................................................39
SAFETY CIRCUIT DESCRIPTION ...............................................40
General .......................................................................................40
Integrated Control Module .........................................................40
Primary Limit Control..................................................................40
Auxiliary Limit Control(s).............................................................40
Rollout Limit Control(s)...............................................................40
Pressure Switches......................................................................40
Flame Sensor..............................................................................40
MAINTENANCE ............................................................................40
Annual Inspection.......................................................................40
Filters ..........................................................................................40
Burners .......................................................................................41
Induced Draft and Circulator Blowers........................................41
Condensate Trap and Drain System (Qualified Servicer Only)..41
Flame Sensor (Qualified Servicer Only)......................................41
Igniter (Qualified Servicer Only)..................................................41
Flue Passages (Qualified Servicer Only) ....................................41
Before Leaving an Installation ....................................................42
Repair and Replacement Parts ..................................................42
TROUBLESHOOTING ..................................................................42
Electrostatic Discharge (ESD) Precautions................................42
Fault Recall .................................................................................42
Resetting from Lockout..............................................................42
Diagnostic Chart.........................................................................43
BLOWER PERFORMANCE DATA...............................................46
WIRING DIAGRAM—ALL WGFM195 EXCEPT
WGFM195090S5C.........................................................................49
WIRING DIAGRAM—ALL WFD195 AND WGFM195090S5C ....50
WIRING DIAGRAM—ALL WFM19...............................................51
ASSISTANCE OR SERVICE .........................................................52
