
38
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.
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.
WGFD295090V5D
A
560
810
1,120
1,620
B
740
1,110
1,220
1,760
C
920
1,430
1,280
1,860
D
1,190
1,860
1,340
1,970
WGFM295045V3B
A
390
600
550
792
B
520
800
600
864
C
650
1,000
650
936
D
780
1,200
700
1,008
WGFM295070V4C
A
390
600
840
1,210
B
520
800
920
1,325
C
715
1,100
1,000
1,440
D
929
1,429
1,080
1,555
WGFM295090V5C
A
550
810
1,050
1,490
B
770
1,100
1,120
1,570
C
1,000
1,470
1,200
1,690
D
1,250
1,810
1,250
1,780
WGFM295090V5D
A
520
800
1,125
1,620
B
715
1,000
1,195
1,721
C
910
1,400
1,265
1,822
D
1,170
1,800
1,335
1,922
WGFM295115V5D
A
520
800
1,230
1,771
B
715
1,100
1,265
1,822
C
910
1,400
1,300
1,872
D
1,170
1,800
1,335
1,922
Switch Bank: S1
DIP Switch Number
Heat-Off Delay
1
2
90 seconds
Off
Off
120 seconds
On
Off
150 seconds*
Off
On
180 seconds
On
On
*Indicates factory setting
Model
Tap
Low-
Stage
Cool
High-
Stage
Cool
Low-
Stage
Heat
High-
Stage
Heat