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Filters-Read This Section Before Installing The Return Air Ductwork; Start-Up Procedure And Adjustment; Heat Anticipator Setting; Furnace Operation - Whirlpool WGFD28 Installation Instructions Manual

80% 2-stage variable speed gas furnace gold models
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Filters—Read this Section Before Installing the Return Air Ductwork
Filters must be used with this furnace. Discuss filter maintenance
with the building owner. Filters are not ship with this furnace, but
must be provided by the installer. Filters must comply with UL900
or CAN/ULCS111 standards. If the furnace is installed without
filters, the warranty will be voided.
NOTE: An undersized opening will cause reduced airflow. The
bottom return is set up as a knockout.
Upright Installations
Depending on the installation and/or customer preference,
differing filter arrangements can be applied. Filters can be
installed in the central return register, in a side panel external filter
rack kit (upflows) or in the ductwork above a downflow furnace.
As an alternative, a media air filter or electronic air cleaner can be
used as the primary filter.
Circulation Air Filters
One of the most common causes of a problem in a forced air
heating system is a blocked or dirty filter. Circulating air filters
must be inspected monthly for dirt accumulation and replaced if
necessary. Failure to maintain clean filters can cause premature
heat exchanger failure.


This furnace must have a 115 VAC power supply properly
connected and grounded. Proper polarity must be maintained for
correct operation. In addition to the following start-up and
adjustment items, refer to further information in "Operational

Heat Anticipator Setting

The heat anticipator in the room thermostat must be correctly
adjusted to obtain the proper number of cycles per hour and to
avoid "overshooting" of the setting. Set the heat anticipator
setting to 0.7 amps. Follow the thermostat manufacturer's
instructions on how to adjust the heat anticipator setting.

Furnace Operation

1. Purge the gas lines of air prior to start-up.
NOTE: Be sure not purge lines into an enclosed burner
2. Check for leaks using an approved chloride-free soap and
water solution, an electronic combustible gas detector or
other approved method.
3. Verify that all required kits (propane gas, high altitude, etc.)
have been appropriately installed.

Furnace Start-Up

1. Close the manual gas shutoff valve external to the furnace.
2. Turn off the electrical power to the furnace.
3. Set the room thermostat to the lowest possible setting.
4. Remove the burner compartment door.
A new home may require more frequent replacement until all
construction dust and dirt is removed. Circulating air filters are to
be installed in the return air duct external to the furnace cabinet.
Minimum Filter Sizes for Disposable Filters—Disposable
Nominal 300 F.M. Face Velocity
Furnace Input
Horizontal Installations
Filters must be installed in either the central return register or in
the return air ductwork.
NOTE: This furnace is equipped with an ignition device which
automatically lights the burner. Do not try to light the burner by hand.
5. Move the furnace gas control valve manual control to the Off
6. Wait 5 minutes, and then check for a gas odor.
NOTE: Check near the floor since some types of gas are heavier than
7. If a gas odor is detected, follow the instructions in "Gas
Furnace Safety Precautions" in this manual.
8. If no gas odor is detected, move the furnace gas control valve
manual control to the On position.
9. Replace the burner compartment door.
10. Open the manual gas shutoff valve external to the furnace.
11. Turn on the electrical power to the furnace.
12. Adjust the thermostat to a setting above room temperature.
13. After the burners are lit, set the thermostat to the desired

Furnace Shutdown

1. Set the thermostat to the lowest setting.
The integrated control will close the gas control valve and
extinguish the flame. Following a 15-second delay, the
induced draft blower will be de-energized. After a 120-, 150-,
180- or 210-second delay period (field-selectable delay Off
[90, 120, 150, 180] plus a 30-second ramp down), the
circulator blower de-energizes.
2. Remove the burner compartment door and move the furnace
gas control valve manual control to the Off position.
3. Close the manual gas shutoff valve external to the furnace.
4. Replace the burner compartment door.
Filter Size (sq. in.)



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