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Installation & Operation Manual
10 Electrical Wiring
Field wiring must comply with the National Electric Code (NEC) and any
applicable local ordinance.
WARNING: ELECTRICAL SHOCK
Disconnect all power to unit before installing or
servicing. More than one disconnect switch may be
required to de-energize the equipment. Hazardous
voltage can cause severe personal injury or death.
10.1 Power Wiring
1.
It is important that proper electrical power is available for
connection to the unit being installed. See the unit nameplate,
wiring diagram, and electrical data in the installation instructions
for more detailed requirements. Voltage tolerance should not be
over 10% from rating voltage.
2.
If any of the wiring must be replaced, replacement wiring must be
the same type as shown in nameplate, wiring diagram and electrical
data sheet.
3.
Install a branch circuit disconnect of adequate size to handle
starting current, located within sight, and readily accessible to the
unit.
E lectric Heater: If the optional Electric Heat Kit is installed, unit
4.
should be equipped with 30~60 amp circuit breakers or fuse.
These breaker(s) protect the internal wiring in the event of a short
circuit and serve as a disconnect. Circuit breakers installed within
the unit do not provide over-current protection of the supply
wiring and therefore may be sized larger than the branch circuit
protection.
Supply circuit power wiring must be 221 °F minimum
copper conductors only. See Table 8 for ampacity, wire
size and circuit protector requirements. Supply circuit
protective devices may be either fuses or "HACR" type
circuit breakers.1-3/8" knockouts inside the cabinet are
provided for connection of power wiring to electric heater.
Power wiring is connected to the power terminal block in
unit electric cabinet. See Electric Heater Kit Installation
Instructions for details.
5.
See wiring diagram located on inside of blower access panel for
proper wiring instructions.
10.2 Grounding
WARNING: ELECTRICAL SHOCK
The unit must be permanently grounded. Failure to
do so can result in electrical shock causing personal
injury or death.
The unit must be electrically grounded in accordance with local
codes or the national electric code.
Grounding may be accomplished by attaching ground wire(s) to
ground lug(s) provided in the unit wiring compartment.
BTC 761701105 A | 03.2019
Bosch Inverter Ducted Packaged Heat Pump | 17
10.3 Control Wiring
L ow voltage control wiring should not be run in conduit with high
voltage wiring. Keep distance between the two conduits per local
codes.
18 AWG. color-coded low voltage wire should be used for
lengths less than 100ft. For wire lengths longer than 100 ft.,
16 AWG. wire should be used.
7/8" knockout hole should be used to route control wires into
the unit.
After installation, ensure separation of low voltage and high
voltage wiring is maintained.
Refer to Figures 16 and 17 for thermostat wiring connections.
Indoor Control
Board
L1 L2
R
High voltage power supply
Figure 16
C
Y1 Y2
G
B
W1 W2 DH NC NC
Control wiring
Data subject to change
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