Bosch BGH96M080C4B - Page 42

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Installation Instructions
Bosch 96% AFUE Condensing Gas Furnace - BTC 770503101 J (06.2023)
Figure 36
Fault LED Last error buttonThermostat connections Fuse
Blower
connections
EAC
Blower power input
Unit power input
(115V/60HZ)
Transformer
Humidifier
Neutral terminals
Furnace Control
Figure 37
115V FIELD-
SUPPLIED
DISCONNECT
J-BOX
24V
TERMINAL
BLOCK
FOUR-WIRE
HEATING-ONLY
NOTE 1
NOTE 2
FIELD-SUPPLIED
DISCONNECT
CONDENSING
UNIT
THREE
WIRE
FURNACE
C
O
N
T
R
O
L
R
G
C
GND
GND
FIELD 24V WIRING
FIELD 115V, 208/230V, WIRING
FACTORY 24V WIRING
FACTORY 115V WIRING
208/230V
THREE
PHASE
208/230V
SINGLE
PHASE
BLOWER DOOR
SWITCH
WHT
BLK
WHT
BLK
NOTES:
Connect Y1, Y / Y 2 -terminal in furnace as shown for proper blower operation.
Some thermostats require a "C" terminal connection as shown.
If any of the original w ire, as supplied, must be replaced, use
same type or equivalent wire.
GND
(two stage cooling system thermostat)
TERMINALS
1.
2.
3.
R
G
Y/Y2
C
Y1
W1
W/W1
Y1
W2
W2
NOTE 3
Y1 connect two-stage cooling thermostat Y1(first stage cool) terminal.
4.
Y/Y2 connect two-stage cooling thermostat Y2(second stage cool)
terminal.
Y/Y2 connect single stage cooling system thermostat Y terminal.
NOTE 4
5.
NOTE 5
Please connect W/W1 with single stage heat system thermostat terminal
W,and W2 reserved.
6.
Y2
Heating and Cooling Application Wiring Diagram with 2-Stage Thermostat