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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
the rollout switch, limit switch, and induced-draft motor Hall Ef-
fect switch.
Fig. 34 — Integrated Gas Control (IGC) Board
Table 31 — 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
J1, 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
J2, 5-6
LS
Limit switch
gas section
switch input
J2, 7-8
CS
Centrifugal switch (not used)
switch input
J2, 9-10
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
RED LED-
S
TATU
S
Summary of Contents for /50HC 04-28
Page 69: ...69 Fig 24 Typical Control Diagram for 48HC 04 14 Units 48HC 08 09 shown ...
Page 70: ...70 Fig 25 Typical Power Diagram for 48HC 04 14 Units 48HC 08 09 shown ...
Page 71: ...71 Fig 26 Typical Control Diagram for 50HC 04 14 Units 50HC 14 shown ...
Page 72: ...72 Fig 27 Typical Power Diagram for 50HC 04 14 Units 50HC 14 Non Humidi MiZer shown ...
Page 73: ...73 Fig 28 Typical Control Diagram 48HC 17 28 Units ...
Page 74: ...74 Fig 29 Typical Control Diagram 50HC 17 28 Units ...
Page 75: ...75 Fig 30 Typical Humid MiZer Power Diagram and Component Arrangement 48 50HC 17 28 Units ...
Page 76: ...76 Fig 31 Typical Non Humid MiZer Power Diagram and Component Arrangement 48 50HC 17 28 Units ...
Page 89: ...89 Fig 42 Modulating ERV Wiring Schematic ...
Page 90: ...90 Fig 43 EnergyX ERV Control Box Component Layouts ...
Page 101: ...101 Fig 59 Exhaust Fan Assembly Removal Exhaust Fan Assembly ...
Page 141: ......