Electrical Wiring; Power Wiring; Grounding; Control Wiring - Bosch IDP Premium 18 SEER2 Series Installation Instructions 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, the unit should
4.
be equipped with suitable circuit breakers or fuse. Refer to Table 11 and
12 for more information. 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. Refer to Table 11 and 12 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 control board 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
and the National Electric Code (NEC).

Grounding may be accomplished by attaching ground wire(s) to ground
lug(s) provided in the unit wiring compartment.
Bosch 18 SEER2 Series Inverter Ducted Packaged Heat Pump - BTC 761703103 A (11.2022)

10.3 Control Wiring

WARNING: FIRE HAZARD

Low 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 100 ft. 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 Figure 18 for thermostat wiring diagrams.
L1 L2
High voltage power supply
Figure 17
Installation Instructions
Indoor Control
Board
C R Y1 Y2 B/O DH W2 W1
G
Control wiring
| 17