66
Integrated Gas Control (IGC) Board
The IGC is provided on gas heat units. (See Fig. 32 and Table 22.)
The IGC controls the direct spark ignition system and monitors the
rollout switch, limit switch, and induced-draft motor Hall Effect
switch.
RED LED-STATUS
C07028
Fig. 32 -- Integrated Gas Control (IGC) Board
Table 22 – Integrated Gas Control (IGC) Board Connections
TERMINAL
LABEL
POINT DESCRIPTION SENSOR LOCATION TYPE OF I/O
CONNECTION
PIN NUMBER
INPUTS
RT, C Power for IDR on 575v units control box 24 VAC Spade
C Input power common Spade
SS Speed sensor gas section analog input J 1 , 1 --- 3
FS, T1 Flame sensor gas section switch input Spade
W Heat stage 1 Call MBB to CTB to IGC 24 VAC J2, 2
G Indoor Fan Call CTB to IGC 24 VAC J2, 3
R Input power from TRAN 1 CTB to IGC 24 VAC J2, 4
RS Rollout switch gas section switch input J 2 , 5 --- 6
LS Limit switch gas section switch input J 2 , 7 --- 8
CS Centrifugal switch (not used) switch input J 2 , 9 --- 1 0
OUTPUTS
L1, CM Induced draft combustion motor or relay gas section line VAC
IFO Indoor fan request control box relay J2, 1
GV (W1) Gas valve (heat stage 1) gas section relay J2, 12
GV (W2) Gas Valve (heat stage 2, from CTB) gas section Not on IGC
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