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Whirlpool WGFD28 Installation Instructions Manual page 25

80% 2-stage variable speed gas furnace gold models
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3. Knowing the furnace model, locate the high-stage cooling
airflow charts in the Specification Sheet applicable to your
model. Look up the cooling airflow determined in Step 2 and
find the required cooling speed and adjustment setting.
Example: A WGFM28070V4BX furnace installed with a
2.5 ton air conditioning system. The airflow needed is
1,000 CFM. Looking at the cooling speed chart for
WGFM28070V4BX, find the airflow closest to 1,000 CFM. A
cooling airflow of 990 CFM can be attained by setting the
cooling speed to B and the adjustment to "+" (plus).
4. Continuous fan speed is 30% of the furnace's maximum
airflow capability.
Example: If the furnace's maximum airflow capability is
2,000 CFM, the continuous fan speed will be
0.30 x 2,000 CFM = 600 CFM.
5. Locate the blower speed selection DIP switches on the
integrated control module. Select the desired cooling speed
tap by positioning DIP switches 1 and 2 appropriately. Select
the desired adjust tap by positioning DIP switches 3 and
4 appropriately. Refer to the following charts for DIP switch
positions and their corresponding taps. Verify CFM by noting
the number displayed on the dual 7-segment LED display.
Speed Selection DIP Switches
Cool
Adjust
Selection
Selection
Switches
Switches
Tap
1
2
3
A
Off
Off
Off
B
On
Off
On
C
Off
On
Off
D
On
On
On
Switch Bank: S3
DIP Switch Number
Cooling Tap
1
A
Off
B
On
C
Off
D*
On
*Indicates factory setting
Speed Taps—Adjust
Switch Bank: S3
DIP Switch Number
Adjust Tap
3
Normal*
Off
+10% Adjust
On
-10% Adjust
Off
Normal
On
*Indicates factory setting
Profile
Heat
Selection
Selection
Switches
Switches
4
5
6
7
Off
Off
Off
Off
Off
On
Off
On
On
Off
On
Off
On
On
On
On
2
Off
Off
On
On
4
Off
Off
On
On
Comfort Mode Profiles
The multispeed circulator blower also offers several custom On/
Off ramping profiles. These profiles may be used to enhance the
cooling performance and increase the comfort level. The ramping
profiles are selected using DIP switches 5 and 6. See the "Profile"
illustrations for DIP switch positions and their corresponding
taps. Verify CFM by noting the number displayed on the dual 7-
segment LED display.
Ramping Profile Tap
A*
B
C
D
* Indicates factory setting
Profile A
Provides a 1 minute Off delay at 100% of the cooling demand
airflow.
100% CFM
Off
8
Off
Off
Profile B
Ramps up to 50% of the full cooling demand airflow for
On
30 seconds.
On
The motor then ramps to 100% of the required airflow.
Provides a 1 minute Off delay at 100% of the cooling demand
airflow.
Off
50% CFM
¹⁄₂ min
Cooling Demand
Profile C
Ramps up to 82% of the full cooling demand airflow for
approximately 7¹⁄₂ minutes.
The motor then ramps to 100% of the required airflow.
Provides a 1 minute Off delay at 100% of the cooling demand
airflow.
82% CFM
Off
7¹⁄₂ min
DIP Switch
Number
5
Off
On
Off
On
100% CFM
Cooling
1 min
Demand
100% CFM
100% CFM
Cooling Demand
6
Off
Off
On
On
Off
100% CFM
Off
1 min
100% CFM
Off
1 min
25

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