Bosch BGH96M060B3B Installation Instructions Manual page 42

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