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Whirlpool WFM18 Installation Instructions Manual page 35

80% single-stage multispeed gas furnace

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WFM18, WFD18 Wiring Diagram
Disconnect ALL power before servicing.
Multiple power sources may be present.
Failure to do so may cause property damage, personal injury or death.
Steady On = Normal Operation
Off = Control Failure
1 Flash = System Lockout (Retries/Recycles Exceeded)
2 Flashes = Pressure Switch Stuck Open
3 Flashes = Pressure Switch Stuck Open
4 Flashes = Open High Limit Switch
5 Flashes = Flame Sensed With Gas Control Valve De-energized
6 Flashes = Open Rollout Switch or Open Fuse
7 Flashes = Low Flame Signal
8 Flashes = Check Igniter or Improper Ground
Continuous Flashes = 115 VAC Polarity Reversed/Verify GND
Equipment GND
Field GND
Field Splice
Switch (Temp.)
Igniter
Pressure Switch
Overcurrent
Prot. Device
Low Voltage (24V)
Low Voltage Field
High Voltage (115V)
High Voltage Field
Junction
Terminal
Internal To
Integrated Control
Plug Connection
Color
Symbol
Gray
GY
White
W
Black
BK
Red
R
Blue
BU
Orange
OR
Yellow
Y
Green
G
Pink
PK
Azure
A
Violet
V
Brown
BR
Check codes for proper wiring and circuit protection before
installation.
NOTES:
1. Set heat anticipator on room thermostat at 0.7 amps.
2. Manufacturer's specified replacement parts must be used
when servicing.
3. If any of the original wire supplied with the furnace must be
replaced, it must be replaced with wiring material having a
temperature rating of at least 105ºC. Use copper conductors
only.
WARNING
HIGH VOLTAGE!
24 VAC
Humidifier
O
G
R
W
Y
Auto
5 Min 2
1 Stg
2 Stg Mode
150 Sec
100 Sec Heat Off Delay
10 11 12
8
7
9
5 6
4
Fuse
1
2 3
See Note 6
Integrated
Control Module
FS
R R
BU
R
PR
2
OR
Y
1
Y
XFMR-H
LINE-H EAC-H
W
PR
BK
24V
115V
XFMR
W
BK
G
W
BK
Door Switch
Located In Blower Compartment
On Some Models
R
W
W
Primary Limit Switch
R
Y
Y
BR
PM
C
HI
1
2
3
Hot
Surface
2-Stage
Igniter
Gas Control Valve
PR
PR
PR
Rollout Limit Switches
Single Control On Some Models
C
G
nd
Stg Delay
Y
W
W
BU
R
Auxiliary
BR
Limits
BR
PARK
BK
BR
BU
BR
BR
W
Circulator
Blower
Capacitor
15-Pin Plug
On Some Models
Blower Compartment
Burner Compartment
24 VAC
Humidifier
NO
C
OR
R
Y
Pressure Switch
Y
W
BK
BU
W
BK
Junction
Box
W
Induced Draft
To 115 VAC/1/60Hz Power Supply With
Blower
Overcurrent Protection Device
Flame
Sensor
4. Blower speeds should be adjusted by the installer to match
the installation requirements to provide the correct heating
temperature rise and the correct cooling CFM. See the
specification sheet for the airflow chart.
5. Unit must be permanently grounded and conform to NEC and
local codes.
6. To recall the last 5 faults, most recent to least recent, depress
the switch for more than 2 seconds while in the standby
mode (no thermostat inputs).
Integrated
Humidifier
Control Module
XFMR (6)
GND
GND (8)
Gas
MVC (9)
Control
MVH (12)
Valve
MVL (2)
Induced
Draft Blower
Auxiliary
Pressure
Limit Controls
Switch
NO
PS (10)
C
PS O (4)
To
HL I (7)
Micro
HL O (1)
Auto Reset
Primary
RO 2 (11)
Limit Control
RO 1 (5)
Manual Reset Rollout
Limit Control(s)
(Single Control On Some Models)
XFMR (3)
24 VAC
40 VA
Transformer
XFMR-N
XFMR-H
115 VAC
Flame Sensor
FP
Hot Surface Igniter
IGN
IGN-N
Induced
Draft
IND
Blower
IND-N
COOL-H
Circulator
Blower
CIR-N
Electronic
Air Cleaner
EAC-H
EAC-N
LINE-H
LINE-N
Junction Box
Door
Switch
Disconnect
L
GND
N
To 115 VAC/1/60Hz Power Supply With
Overcurrent Protection Device
LINE-N
GND
LINE-H
35

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