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4.3 Return Air Panel Configuration
REMOVE BOTTOM
COIL PANEL OFF PLATE
Figure 8
Different return air configuration
Bottom Return Conversion:
Divert the return air from the factory standard front return to a bottom return.
Remove the cross brace when converting cabinet to bottom return.
Bosch BWA Series Air Handler - BTC 761703105 A (03.2023)
5 Electrical wiring
Field wiring must comply with the National Electric Code (C.E.C. in Canada) and
any applicable local ordinances.
INSTALL
FRONT
5.1 Power Wiring
COIL PANEL
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.
f If required, install a branch circuit disconnect of adequate size, located
within sight, and readily accessible from the unit.
W hen the Electric Heater is installed, units may be equipped with one 60
amp. circuit breaker. 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.
f Supply circuit power wiring must be 167°F minimum copper conductors
only. See Electrical Data In this section for ampacity, wire size and circuit
protector requirements. Supply circuit protection devices may be either
fuses or "HACR" type circuit breakers.
f High voltage wiring may be run through knockout holes on the right, left or
top of the unit.
f Two 7/8" dia. concentric knockouts are provided for running high voltage
wiring to the unit. Refer to Figure 2 for High Voltage knock out locations.
f High voltage wiring must be connected to the red and black wiring in the
control section of the air handler.
WARNING: ELECTRICAL SHOCK
Disconnect all power to unit before installing or servicing. More
than one disconnect switch may be required to deenergize the
equipment. Hazardous voltage can cause severe personal injury or
death.
Installation Instructions
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