8
Condensate
Drain
Figure 6. condensate drain location
• See the unit wiring label for proper high and low voltage
wiring. Make all electrical connections in accordance with
all applicable codes and ordinances.
• 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 for maximum circuit ampacity and
maximum overcurrent protection limits.
• Check all factory wiring to the wiring diagrams. Verify none
of the connections loosened during shipping or installation.
• A wiring diagram/schematic is located on the inside cover
of the electrical box of the outdoor unit. The installer should
become familiar with the wiring diagram/schematic before
making any electrical connections to the outdoor unit. See
• Provide power supply for the unit in accordance with the
unit wiring diagram, and the unit rating plate.
caution:
label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation. verify proper
operation after servicing.
• Units are shipped from the factory wired for 240 volt
transformer operation. For 208V operation, remove the
lead from the transformer terminal marked 240V and
connect it to the terminal marked 208V.
• Internally mounted circuit breakers are available as field
installed options. These circuit breakers can be used as
an electrical disconnect.
• Connect the line-voltage leads to the terminals on the
contactor inside the control compartment.
grounding
Warning:
the unit cabinet must have an uninterrupted or
unbroken electrical ground to minimize personal
injury if an electrical fault should occur. do not
use gas piping as an electrical ground!
This unit must be electrically grounded in accordance with
local codes or, in the absence of local codes, with the National
Electrical Code (ANSI/NFPA 70) or the CSA C22.1 Electrical
Code. Use the grounding lug provided in the control box for
grounding the unit.
unbalanced 3-Phase Supply voltage
Voltage unbalance occurs when the voltages of all phases
of a 3-phase power supply are no longer equal. This
unbalance reduces motor efficiency and performance. Some
underlying causes of voltage unbalance may include: Lack
of symmetry in transmission lines, large single-phase loads,
and unbalanced or overloaded transformers. A motor should
never be operated when a phase imbalance in supply is
greater than 2%.
Perform the following steps to determine the percentage of
voltage imbalance:
electrical Wiring
Warning:
Shut off all electrical power to the unit before
performing any maintenance or service on the
system. Failure to comply may result in personal
injury or death.
• 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 that 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.
refer to the unit wiring label for proper high and low voltage
wiring.
√
Verify factory wiring is in accordance with the unit wiring
diagram. See
. Inspect for loose connections.
√
Phase balance on 3 phase units must always be checked.
See Unbalanced 3-Phase Supply Voltage section (
).
line voltage
• 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.
•
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.
• Use only copper wire for the line voltage power supply to
). Use proper code agency
listed conduit and a conduit connector for connecting
the supply wires to the unit. Use of rain tight conduit is
recommended.
