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Installation Instructions
Bosch 18 SEER2 Series Inverter Ducted Packaged Heat Pump - BTC 761703103 A (11.2022)
Figure 18
THERMOSTAT
UNIT CONTROL BOARD
TERMINAL STRIP
R
C
Y1
Y2
G
W1
B
W2
R
C
Y
Y2
G
W/E
O/B
H/DH
Dh
GREEN
BLUE
WHITE
GRAY
PURPLE
YELLOW
BROWN
RED
R
C
Y1
Y2
G
W1
B
W2
R
C
Y
Y2
G
W/E
O/B
H/DH
Dh
W2
GREEN
BLUE
WHITE
WHITE/BLACK
GRAY
PURPLE
YELLOW
BROWN
RED
R
C
Y1
Y2
G
W1
B
W2
R
C
Y
G
W/E
O/B
H/DH
Dh
W2
GREEN
BLUE
WHITE
WHITE/BLACK
GRAY
YELLOW
BROWN
RED
R
C
Y1
Y2
G
W1
B
W2
R
C
Y
Y2
G
O/B
H/DH
Dh
GREEN
BLUE
GRAY
PURPLE
YELLOW
BROWN
RED
R
C
Y1
Y2
G
W1
B
W2
R
C
Y
G
O/B
H/DH
Dh
GREEN
BLUE
GRAY
YELLOW
BROWN
RED
R
C
Y1
Y2
G
W1
B
W2
R
C
Y
G
O/B
H/DH
Dh
W/E
GREEN
BLUE
WHITE
GRAY
YELLOW
BROWN
RED
Support 3H and 2C thermostat Support 4H and 2C thermostat
THERMOSTAT
UNIT CONTROL BOARD
TERMINAL STRIP
Support 3H and 1C thermostat
Support 2H and 2C thermostat
THERMOSTAT
UNIT CONTROL BOARD
TERMINAL STRIP
THERMOSTAT
UNIT CONTROL BOARD
TERMINAL STRIP
THERMOSTAT
UNIT CONTROL BOARD
TERMINAL STRIP
THERMOSTAT
UNIT CONTROL BOARD
TERMINAL STRIP
Support 1H and 1C thermostat Support 2H and 1C thermostat
Thermostat Wiring Diagrams
Dh wiring is optional and requires a thermostat with a
humidistat. Dh functions as Passive Dehumidication and will downstage
the indoor fan speed. System will operate according to normal sequence of
operations if Dh wiring is absent.
Y2 wiring is optional for 4 speed fan control. For 2 stage fan control Y2
wiring is required.
Dashed lines in the above thermostat wiring diagrams refer
to optional wiring (wiring for Passive Dehumidifi cation Function and/
OR Electric Heat, and 2 stage fan control). For thermostat wiring please
refer to the Owner’s Manual of the thermostat.
B wire must be used with heat pump system only, the reversing
valve energizes in heating.
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