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ELEctRIcAL coNNEctIoNS
WARNING:
ELEctRIcAL SHocK, FIRE oR EXPLoSIoN
HAZARD
Failure to follow safety warnings exactly could
result in serious injury or property damage.
Improper servicing could result in dangerous
operation, serious injury, death or property
damage.
• Before servicing, disconnect all electrical power
to the air handler.
• When servicing controls, label all wires prior
to disconnecting. Reconnect wires correctly.
• Verify proper operation after servicing.
Electrical connections must be in compliance with all
applicable local codes and ordinances, and with the
current revision of the National Electric Code (ANSI/NFPA
70). For Canadian installations, the electrical connections
and grounding shall comply with the current Canadian
Electrical Code (CSA C22.1 and/or local codes).
Pre-Electrical checklist
√ Verify the voltage, frequency, and phase of the supply
source match the specifications on the unit rating plate.
√ Verify that the service provided by the utility is sufficient
to handle the additional load imposed by this equipment.
See the unit wiring label or Table 7 (page 17) for proper
high and low voltage wiring.
√ Verify factory wiring is in accordance with the unit
wiring diagrams (Figures 15-18, pages 20-23). Verify no
connections came loose during shipping or installation.
Line Voltage
• An electrical disconnect must be located within sight
of and readily accessible to the unit. This switch shall
be capable of electrically de-energizing the outdoor unit.
See unit data label for proper incoming field wiring. Any
other wiring methods must be acceptable to authority
having jurisdiction.
• It is recommended that the line voltage to the unit be
supplied from a dedicated branch circuit containing the
correct fuse or circuit breaker for the unit.
• The installer should become familiar with the wiring
diagram/schematic before making any electrical
connections to the unit. See the unit wiring label or
(Figures 15-18, pages 20-23).
• Use only copper wire for the line voltage power supply
to this unit. Use proper code agency listed conduit and
a conduit connector for connecting the supply wires to
the unit. Aluminum supply wire may be used if a heater
kit is installed.
• Provide power supply for the unit in accordance with the
unit wiring diagram, and the unit rating plate. Use UL
8
listed conduit and conduit connectors for connecting the
supply wires to the unit and for proper grounding. Field
supplied bushings for the power supply cables must be
added to support and protect the power supply cables.
• If replacing any of the original wires supplied with the
unit, the replacement wire must be copper wire consisting
of the same gauge and temperature rating.
• Circuit breakers installed in the B6BV series air handler
are for short-circuit protection of the internal wiring
and to serve as a unit disconnect. They do not provide
over-current protection of the supply wiring. Overcurrent
protection must be provided at the branch circuit
distribution panel and sized as shown on the unit rating
label and according to applicable local codes. See the
unit rating plate and Table 8 (page 15) for maximum
circuit ampacity and maximum overcurrent protection
limits.
• All 208/230 Volt units are shipped from the factory wired
for 240 volt operation. For 208V operation, remove the
lead from the transformer terminal marked 240V and
connect it to the terminal marked 208V.
Single Circuit Adaptor Kit
If a single circuit adaptor kit is used, it may need to be re-
configured for some applications. Remove the single circuit
adaptor kit cover and verify that the lugs are configured
correctly for the application. If the lugs are not configured
for the application, refer to the instructions included with
the kit and modify the configuration.
Install the single circuit adaptor kit (if used) in the line
side ("on" end) of the circuit breakers. Tighten the lugs
securely (45 in-lbs recommended). Connect the supply
wiring to the circuit breakers, single circuit adaptor kit, or
terminal block. Tighten the lugs securely.
Dual Supply Circuits
When using dual supply circuits verify that the supply
sized for circuit "A" is connected to the circuit breaker
that is connected to the top element assembly. Replace
metal circuit breaker line cover. Refer to Figure 10 (page
15) for thermostat wiring examples.
control Board
The control board in the air handler controls the timing
sequence of the elements. The board is equipped with a
3 second blower ON delay and a 15 second blower OFF
delay in heating and a 40 second blower OFF delay in
cooling. See Figures 11 or 12 (page16).
Twinning
B6BM air handlers are not supplied with a built in twinning
capability. To connect two air handlers to a common
single stage AC condensing unit or heat pump, a twinning
kit is available for field installation. Please follow the
instructions supplied with the kit.
NotE: Variable speed air handlers cannot be twinned.
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