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12 Wiring Diagrams
WARNING: ELECTRICAL SHOCK
Disconnect all power before servicing or installing this unit.
Multiple power sources may be present. Failure to do so may
cause property damage, personal injury or death.
DANGER: ELECTRICAL SHOCK
This unit must be properly grounded and protected by a circuit
breaker or fuse.
WARNING: ELECTRICAL SHOCK
These units must be wired and installed in accordance with all
National and Local Safety Codes.
f To avoid electrical shock, please ensure:
—
The heat pump is properly grounded
—
The main power plug to the heat pump has been joined with the
ground wiring (DO NOT ALTER THIS).
f Do not strain the power wiring.
Dashed lines in the following thermostat wiring diagrams refer to optional
wiring (wiring for Electric Heat). For thermostat wiring please refer to the
Owner's Manual of the thermostat.
Wiring for 3H and 1C thermostat
W2
W/E
Y
R
G
C
O/B
THERMOSTAT
For single-stage auxiliary heating
(supported by 2H thermostat), jump W1
and W2.
Figure 11
Thermostat wiring diagram for BOVA 15 with BWA
Bosch BWA Series Air Handler - BTC 761703105 A (03.2023)
Electric wiring gauge for H/P systems
Input Current Fuse
Table 9
C
G
R
W1
Y
INDOOR UNIT
Model(Btu/h)
Phase
Power
Voltage/frequency
Indoor unit (A)
Line Quantity
Indoor Unit
Power Line
Line Diameter (AWG)
Line Quantity
Outdoor Unit
Power Line
Line Diameter (AWG)
Line Quantity
Outdoor -Indoor
Signal Line
Line Diameter (AWG)
Line Quantity
Thermostat
Signal Line
Line Diameter (AWG)
W2
C
OUTDOOR UNIT
Installation Instructions
18
24
30
36
Single
208/230VAC, 60Hz
15A
15A
15A
15A
3
3
3
3
14
14
14
14
3
3
3
3
14
14
12
12
4
4
4
4
18
18
18
18
5
5
5
5
18
18
18
18
B
Y
W
| 19
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