Wiring Guide Part 2

ICM2805 WIRING DIAGRAM
For 80+ and 90+ Model Furnaces
LAPP47-1
FAULT CONDITION STATUS RED LIGHT
Power ON ON
Limit circuit open 1 FLASH
Pressure switch stuck open 2 FLASHES
Pressure switch stuck Closed 3 FLASHES
Ignition failure (check ground) 4 FLASHES
115 VAC & neutral reversed or no ground 5 FLASHES
Continuous
Power OFF OFF
FAULT CONDITION FLAME YELLOW LIGHT
Flame present ON
False flame or gas relay shorted
Low flame sensor signal Continuous flash
NOTE:
If any of the original wire as supplied with
the furnace must be replaced, it must be
replaced with wiring material having a
temperature rating of at least 105 C.
Use copper conductors only.
LEGEND
• Field Wiring
Factory Wiring:
• Low Voltage
• High Voltage
120/240V
NEUTRALS
ORANGE
WHITE
BLUE
RED
BLACK
BLACK
BLACK
24V
COM
TWIN
3 AMP FUSE
HUM
1 4
2 5
3 6
1 4 7
2 5 8
3 6 9
LI
XFMR
EAC
COOL
HEAT
M3 M2 M1
HUM
EAC
INDUCER
GAS
VALVE
IGNITOR
BLACK
BLACK
BLACK
BLACK
L
ML
MH
H
C
3 OR 4 SPEED
MOTOR
ORANGE
WHITE
BLUE
RED
BLACK
6
5
4
3
2
1
MOTOR PLUG
YELLOW
RED
BROWN
WHITE
WHITE
WHITE W/ BLACK STRIPES
24V
BLACK W/ WHITE STRIPES
BLACK
TRANSFORMER
WHITE
VENT SAFETY
SWITCH (SELECT
MODELS Only)
BLACK
WGYCR
W
G
Y
R
ROOM
THERMOSTAT
Y
C
AIR CONDITIONER
CONDENSING UNIT
FLAME SENSOR
WHITEBLACK
FLAME ROLL-OUT
SWITCH (SELECT
MODELS ONLY)
VENT SAFETY
SWITCH (SELECT
MODELS ONLY)
VENT PRESSURE
SWITCH
(93+ MODELS ONLY)
PRESSURE
SWITCH
BLOWER DECK
SWITCH (SELECT
MODELS ONLY)
AIR SUPPLY
LIMIT SWITCH
(ALL MODELS)
FLAME ROLL-OUT
SWITCH
(ALL MODELS)
ORANGE
ORANGE
BLUE
BLUE
These wires are not present on all models.
JUNCTION BOX
BLOWER
DOOR
SWITCH
FLAME
STATUS
BLOWER OFF
60
90
120
180
120/240 INPUT
VOLTAGE
GROUND