LIAF299-1
Molex Plug Pin Out
Pin 1 Limit switch input
Pin 2 24 VAC COM
Pin 3 Gas valve output
Pin 4 Limit switch output
Pin 5 Pressure switch input
Pin 6 Pressure switch output
Pin 7 MRLC (Manual Reset Limit Control) input
Pin 8 MRLC (Manual Reset Limit Control) output
Pin 9 Flame sense
7
9
8
4
6
5
2
1
3
Flashes Fault Condition
ON
Normal operation
OFF
No power or incorrect gas valve wiring
1
Flame loss or ignition failure lockout
2
Pressure switch stuck open or stuck closed
3
Limit switch open
4
Flame detected with gas valve closed
5
MRLC (Manual Reset Limit Control) open
6
Internal Error
Fault Codes
Connection Diagram
K5
K4
LS
MRLC
PS
C
W
R
24 VAC
T-Stat
1
4
7
8
5
6
3
2
9
ACC = Accessory
DI
= Draft inducer
FS
= Flame sensor
GND = Ground
GV
= Gas valve
K4,K5 = Internal relays
LS
= Limit switch
MRLS = Manual reset limit switch
PS
= Vent pressure switch
LEGEND
Wiring Diagram
G
Y
R
X
C
C
C
W
L2/C1
UNUSED
L1/R1
Induced
Draft
Motor
DI
HEAT
ACC
COOL
LED 1
COM
HI
MH
ML
LOW
MOV1
CAP
SE
Earth
Ground
Earth
Ground
GND
24 VAC
Secondary
208/230 VAC
Primary
3
6
9
1
4
7
2
5
8
ICM2909
Screw must
be grounded
to the frame
of the furnace
