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Blower Heat Off Delay Timings; Normal Sequence Of Operation; Power Up; Heating Mode - Whirlpool WGFM29 Installation Instructions Manual

93% and 95% 2-stage variable-speed gas furnace
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WGFD295090V5D
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WGFM295045V3B
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WGFM295070V4C
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Blower Heat Off Delay Timings

The integrated control module provides a selectable heat-off
delay function. The heat off delay period may be set to 90, 120,
150 or 180 seconds using the DIP switches or jumper provided
on the control module. The delay is factory-shipped at
150 seconds, but may be changed to suit the installation
requirements and/or homeowner preference. Refer to the
following chart for DIP switch positions and corresponding delay
times.
Switch Bank: S1
DIP Switch Number
Heat-Off Delay
1
90 seconds
Off
120 seconds
On
150 seconds*
Off
180 seconds
On
*Indicates factory setting
38
Low-
High-
Low-
High-
Stage
Stage
Stage
Stage
Cool
Cool
Heat
Heat
560
810
1,120
1,620
740
1,110
1,220
1,760
920
1,430
1,280
1,860
1,190
1,860
1,340
1,970
390
600
550
792
520
800
600
864
650
1,000
650
936
780
1,200
700
1,008
390
600
840
1,210
520
800
920
1,325
715
1,100
1,000
1,440
929
1,429
1,080
1,555
550
810
1,050
1,490
770
1,100
1,120
1,570
1,000
1,470
1,200
1,690
1,250
1,810
1,250
1,780
520
800
1,125
1,620
715
1,000
1,195
1,721
910
1,400
1,265
1,822
1,170
1,800
1,335
1,922
520
800
1,230
1,771
715
1,100
1,265
1,822
910
1,400
1,300
1,872
1,170
1,800
1,335
1,922
2
Off
Off
On
On
NORMAL SEQUENCE
OF OPERATION

Power Up

The normal power up sequence is as follows:
115 VAC power applied to furnace.
Integrated control module performs internal checks.
Integrated control module displays "88" on the dual
7-segment LED display.
Integrated control module monitors safety circuits
continuously.
Furnace awaits call from thermostat. Displays "OP" on the
dual 7-segment LED display.

Heating Mode

The normal operational sequence in heating mode is as follows:
R and W1 (or R and W1/W2) thermostat contacts close,
initiating a call for heat.
Integrated control module performs safety circuit checks.
Induced draft blower is energized on high speed for a
15-second prepurge. Humidifier terminal is energized with
induced draft blower.
Induced draft blower steps to low speed following prepurge.
Low-stage pressure switch contacts are closed.
Igniter warm-up begins upon step to low speed and presence
of closed low-stage pressure switch contacts.
Gas control valve opens at the end of the igniter warm-up
period, delivering gas to the burners and establishing a flame.
Integrated control module monitors flame presence. Gas
control valve will remain open only if flame is detected.
If the thermostat call is for low heat, the gas control valve and
induced draft blower will continue on low stage. If the call is
for high heat, the gas control valve and induced draft blower
will change to high stage.
Circulator blower is energized on heat speed following a fixed
30-second blower-on delay. The circulator blower requires
30 seconds to ramp up to full speed. Electronic air cleaner
terminal is energized with circulator blower.
Furnace is now operating on the specified stage called for by
the 2-stage thermostat.
Furnace runs, integrated control module monitors safety
circuits continuously.
If the 2-stage thermostat changes the call from low heat to
high heat, the integrated control module will immediately
switch the induced draft blower, gas control valve and
circulator blower to their high-stage settings.
If the 2-stage thermostat changes the call from high heat to
low heat, the integrated control module will immediately
switch the induced draft blower and gas control valve to their
low-stage settings. The circulator blower will remain on
high-heating speed for 30 seconds before switching to the
low-heat circulating speed.

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