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24-Volt Dehumidistat Wiring - Whirlpool WGFD293 Installation Instructions Manual

93% and 95% 2-stage variable speed gas furnace
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Thermostat Wiring Diagram—Single-Stage Thermostat
Application
Y
Y
C
A. Thermostat—single-stage heating
and single-stage cooling
B. Furnace integrated control module
NOTE: To apply a single-stage heating thermostat, the
thermostat selector switch on the integrated control module must
be set on single-stage.
Thermostat Wiring Diagram—2-Stage Heating with
Single-Stage Cooling
Y
Y
C
D
A. Thermostat—2-stage heating and
single-stage cooling
B. Furnace integrated control module
Thermostat Wiring Diagram—2-Stage Heating with
2-Stage Cooling
Y2
Y2
Y2
A. Thermostat—2-stage heating and
2-stage cooling
B. Furnace integrated control module
A
R
R
B
NEU
C
D
C. Dehumidistat (optional)
D. Remote condensing unit
(single-stage cooling)
A
R
R
B
NEU
C
C. Dehumidistat (optional)
D. Remote condensing unit
(single-stage cooling)
A
W2
W1
W1
W2
B
NEU
C
D
C. Dehumidistat (optional)
D. Remote condensing unit
(2-stage cooling)
A single-stage thermostat with only one heating stage may be
used to control this furnace. The application of a single-stage
thermostat does not offer true thermostat-driven 2-stage
operation, but provides a timed transition from low to high fire.
The furnace will run on low stage for a fixed period of time before
stepping up to high stage to satisfy the thermostat's call for heat.
The delay period prior to stepping up can be set at either a fixed
5-minute transition time or a load based variable time between
1 and 12 minutes (Auto transition). If the Auto transition mode is
selected, the control averages the cycle times of the previous
3 cycles and uses the average to determine the time to transition
from low stage to high stage.
To use a single-stage thermostat:
1. Turn off power to the furnace.
2. Move the thermostat selection DIP switch to the Off
(single-stage) position.
3. Set the desired transition time by setting the Stage Delay DIP
switch to On for Auto transition, or Off for 5-minute transition
time.
4. Turn on power. Refer to the following illustration.
Heat OFF Delay
DIP Switches

24-Volt Dehumidistat Wiring

The optional usage of a dehumidistat allows the furnace's
circulator blower to operate at a slightly lower speed (82% of
desired speed) during a combined thermostat call for cooling and
dehumidistat call for dehumidification. This can be done through
an independent dehumidistat or through a thermostat's DEHUM
terminal (if available). This lower blower speed enhances
dehumidification of the conditioned air as it passes through the
AC coil. For proper function, a dehumidistat applied to this
furnace must operate on 24 VAC and utilize a switch which opens
on humidity rise.
To install/connect a dehumidistat:
1. Turn off power to furnace.
2. Secure the dehumidistat neutral wire (typically the white lead)
to the terminal marked DEHUM on the furnace integrated
control module.
3. Secure the dehumidistat hot wire (typically the black lead) to
the terminal marked R on the furnace integrated control
module.
4. Secure the dehumidistat ground wire (typically the green lead)
to the ground screw on the furnace junction box.
NOTE: Ground wire may not be present on all dehumidistats.
5. Turn on power to furnace.
To enable the dehumidify function on the integrated control
module, set the dehumidification DEHUM DIP switch from Off to
On.
Once the switch is set, the dehumidify function is enabled during
a combination call for cooling (T-Stat) and dehumidification
(DEHUM-Stat).
ON
9
10
ON
OFF
3
Thermostat
4
Stage Delay
S1
OFF
DEHUM
Unused
S5
25

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