56
Integrated Gas Control (IGC) Board
The IGC is provided on gas heat units. The IGC controls the direct
spark ignition system and monitors the rollout switch, limit switch,
and flue gas pressure switch.
a48---10376
Fig. 30 -- Integrated Gas Control (IGC) Board
Table 24 – Integrated Gas Control (IGC) Board Connections
TERMINAL
LABEL
POINT DESCRIPTION SENSOR LOCATION TYPE OF I/O
CONNECTION
PIN NUMBER
INPUTS
24VAC, C Power for IDR on 575v units control box 24 VAC Quick Connects
C Input power common TB4 to IGC 24 VAC P2, 1
R Input power from TRAN 1 TB4 to IGC 24 VAC P2, 6
L1 High voltage supply or 24vac control box 208/230v, 460v, or 24vac Quick Connect
FS Flame sensor gas section switch input Quick Connect
W Heat stage 1 Call MBB to IGC 24 VAC P2, 3
G Indoor Fan Call not used 24 VAC P2, 4
RS Rollout switch gas section switch input P 1 , 3 --- 4
LS Limit switch gas section switch input P1, 1 and 8
PS Pressure Differential switch gas section switch input P 1 , 6 --- 7
FOD Fan Off Delay jumper control box jumper P3
OUTPUTS
CM Induced draft combustion motor or IDR gas section line VAC or 24vac Quick Connect
T1 Ignition Spark gas section high voltage spark Quick Connect
IFO Indoor fan request control box relay P2, 5
C Common for Gas Valve gas section 24 VAC P1, 2
GV (W1) Gas valve (heat stage 1) gas section relay P1, 5
GV (W2) Gas Valve (heat stage 2, from MBB) gas section Not on IGC
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