Integrated Gas Control (Igc) Board - Carrier 48/50PG Series Controls, Start-Up, Operation, Service And Troubleshooting Instructions

Integrated Gas Control (IGC) Board

The IGC is provided on gas heat units. (See Fig. 47 and Table 25.)
The IGC controls the direct spark ignition system and monitors the
rollout switch, limit switch, and induced-draft motor Hall Effect
switch.
TERMINAL
LABEL
RT, C Input power from TRAN 1
SS Speed sensor
FS, T1 Flame sensor
W Heat stage 1
RS Rollout switch
LS Limit switch
CS Centrifugal switch (not used)
L1, CM Induced draft combustion motor
IFO Indoor fan request
GV (W1) Gas valve (heat stage 1)
GV (W2) Gas Valve (heat stage 2, from MBB)
RED LED-STATUS
Fig. 47 - - Integrated Gas Control (IGC) Board
Table 25 – IGC Connections
POINT DESCRIPTION
The IGC is equipped with an LED (light-emitting diode) for
diagnostics. See the Troubleshooting section for more information.
SENSOR LOCATION
INPUTS
control box
gas section
gas section
MBB
gas section
gas section
OUTPUTS
gas section
control box
gas section
gas section
79
CONNECTION
TYPE OF I/O
PIN NUMBER
24 VAC
analog input J1, 1--- 3
switch input
24 VAC J2, 2
switch input J2, 5--- 6
switch input J2, 7--- 8
switch input J2, 9--- 10
line VAC
relay J2, 1
relay J2, 12
Not on IGC
C07028