Instruction manual

27
To Set Airflow
1. Select the model and desired high-stage cooling airflow.
2. Determine the corresponding tap (A, B, C, or D).
3. Set DIP switches 1 and 2 to the appropriate On/Off positions.
4. Select the model and desired high-stage heating airflow.
5. Determine the corresponding tap (A, B, C, or D).
6. Set DIP switches 7 and 8 to the appropriate On/Off positions.
7. Select the airflow adjustment factor taps (A and D are 1; Tap
B is +10; Tap C -10).
8. Set DIP switches 3 and 4 to the appropriate On/Off positions.
To Set Comfort Mode
1. Select desired comfort mode profile. See Comfort Mode
Profile chart.
2. Set DIP switches 5 and 6 to the appropriate On/Off positions.
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.
Model Tap
Low-
Stage
Cool
High-
Stage
Cool
Low-
Stage
Heat
High-
Stage
Heat
WGFD28070V3BX A 390 600 735 1,050
B 520 800 805 1,150
C 650 1,000 875 1,250
D 780 1,200 935 1,350
WGFD28090V5CX A 520 800 945 1,350
B 715 1,100 1,015 1,450
C 910 1,400 1,085 1,550
D 1,170 1,800 1,155 1,650
WGFD28115V5CX A 553 850 1,085 1,550
B 748 1,150 1,155 1,650
C 943 1,450 1,225 1,750
D 1,203 1,850 1,260 1,800
WGFM28070V4BX A 390 600 875 1,250
B 520 800 945 1,350
C 715 1,100 1,015 1,450
D 910 1,400 1,085 1,550
WGFM28090V5CX A 520 800 1,050 1,500
B 715 1,100 1,120 1,600
C 910 1,400 1,190 1,700
D 1,170 1,800 1,260 1,800
WGFM28115V5CX A 520 800 1,210 1,725
B 715 1,100 1,225 1,750
C 910 1,400 1,245 1,775
D 1,170 1,800 1,260 1,800
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