40
Fig. 51 — Typical IGC Wiring Diagram
Table 15 — IGC Connections
TERMINAL LABEL POINT DESCRIPTION SENSOR LOCATION TYPE OF I/O
CONNECTION
PIN NUMBER
INPUTS
RT, C Input power from TRAN 1 control box 24 vac —
SS Speed sensor gas section analog input J1, 1-3
FS, T1 Flame sensor gas section switch input —
W Heat stage 1 LCTB 24 vac J2, 2
RS Rollout switch gas section switch input J2, 5-6
LS Limit switch fan section switch input J2, 7-8
CS Centrifugal switch (not used) — switch input J2, 9-10
OUTPUTS
L1, CM
Induced draft combustion
motor
gas section line VAC —
IFO Indoor fan control box relay J2, 1
GV Gas valve (heat stage 1) gas section relay J2, 11-12
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