Integrated Gas Control (Igc) Board - Carrier 48HC 04-28 Controls, Start-Up, Operation And Troubleshooting

Integrated Gas Control (IGC) Board

The IGC is provided on gas heat units. (See Fig. 34 and Table 31.)
The IGC controls the direct spark ignition system and monitors
TERMINAL LABEL
INPUTS
RT, C Power for IDR on 575v units
C Input power common
SS Speed sensor
FS, T1 Flame sensor
W Heat stage 1 Call
G Indoor Fan Call
R Input power from TRAN 1
RS Rollout switch
LS Limit switch
CS Centrifugal switch (not used)
OUTPUTS
L1, CM Induced draft combustion motor or relay
IFO Indoor fan request
GV (W1) Gas valve (heat stage 1)
GV (W2) Gas Valve (heat stage 2, from CTB)
RED LED-STATUS
Fig. 34 — Integrated Gas Control (IGC) Board
Table 31 — Integrated Gas Control (IGC) Board Connections
POINT DESCRIPTION
the rollout switch, limit switch, and induced-draft motor Hall Ef-
fect switch.
SENSOR LOCATION
control box
gas section
gas section
MBB to CTB to IGC
CTB to IGC
CTB to IGC
gas section
gas section
gas section
control box
gas section
gas section
80
CONNECTION PIN
TYPE OF I/O
NUMBER
24 VAC Spade
Spade
analog input J1, 1- 3
switch input Spade
24 VAC
24 VAC
24 VAC
switch input J2, 5-6
switch input J2, 7-8
switch input J2, 9-10
line VAC
relay
relay
Not on IGC
J2, 2
J2, 3
J2, 4
J2, 1
J2, 12