Bosch BGH96M060B3A Installation, Operation And Maintenance Manual page 42

4 2 | Bosch 96% AFUE Gas Furnace
Thermostat connections
Fuse
Figure 35
Furnace Control
FOUR-WIRE
HEATING-ONLY
BLOWER DOOR
SWITCH
BLK BLK
WHT WHT
GND
115V FIELD-
J-BOX
SUPPLIED
DISCONNECT
Figure 36 Heating and Cooling Application Wiring Diagram with 2-Stage Thermostat
Data subject to change
Last error button Fault LED
(two stage cooling system thermostat)
TERMINALS
W2 W1
R
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 Y1 Y2 NOTE 2
G
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.
Installation, Operation & Maintenance
Unused blower terminal
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
04.2019 | Bosch Thermotechnology Corp.