80% SINGLE-STAGE MULTISPEED GAS FURNACE
INSTALLATION INSTRUCTIONS
Table of Contents
GAS FURNACE SAFETY................................................................2
INSTALLATION REQUIREMENTS ................................................4
Tools and Parts ............................................................................4
Electrostatic Discharge (ESD) ......................................................4
Location Requirements ................................................................4
Installation Configurations ...........................................................7
Ductwork Requirements ..............................................................8
Electrical Requirements ...............................................................8
Gas Supply Requirements ...........................................................9
Venting Requirements..................................................................9
INSTALLATION INSTRUCTIONS ................................................10
Inspect Shipment .......................................................................10
Plan Vent System .......................................................................10
Install Ductwork..........................................................................14
Filter Specifications....................................................................15
Make Electrical Connections .....................................................16
115-Volt Line Connection of Accessories—
Electronic Air Cleaner.................................................................18
Make Gas Connections..............................................................18
Start-Up Procedure and Adjustment .........................................22
Complete Installation..................................................................26
Furnace Shutdown .....................................................................26
SEQUENCE OF OPERATION ......................................................27
Power Up....................................................................................27
Heating Mode—Mode DIP Switch Set to 1 STG Position.........27
Heating Mode—Mode DIP Switch Set to 2 STG Position.........27
Cooling Mode .............................................................................27
Fan Only Mode ...........................................................................27
OPERATIONAL CHECKS.............................................................28
Burner Flame ..............................................................................28
Auxiliary Limit Control ................................................................28
Circulator Blower Speed ............................................................28
MAINTENANCE ............................................................................31
Annual Inspection.......................................................................31
Filters ..........................................................................................31
TROUBLESHOOTING ..................................................................32
Resetting from Lockout..............................................................34
ASSISTANCE OR SERVICE .........................................................36
Accessories ................................................................................36
WPIO-359B
Whirlpool
®
Home Cooling and Heating
14610 Breakers Drive
Jacksonville, Florida 32258
Whirlpool
®
Model
WFM18, WFD18
ATTENTION INSTALLATION PERSONNEL
As a professional installer, you have an obligation to know the product better than the customer. This includes all
safety precautions and related items. Prior to actual installation, thoroughly familiarize yourself with this instruction
manual. Pay special attention to all safety warnings. Often during installation or repair, it is possible to place
yourself in a position which is more hazardous than when the unit is in operations.
Remember, it is your responsibility to install the product safely and to know it well enough to be able to instruct a
customer in its safe use. Safety is a matter of common sense...a matter of thinking before acting. Most dealers have
a list of specific good safety practices...follow them.
The precautions listed in this installation manual are intended as supplemental to existing practices. However, if
there is a direct conflict between existing practices and the content of this manual, the precautions listed here take
precedence.
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