7
ELECTRICAL CONNECTIONS
WARNING:
To avoid electric shock, personal injury, or death,
turn off the electric power at the disconnect or the
main service panel before making any electrical
connections.
• 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.
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.
• Provide power supply for the unit in accordance with
the unit wiring diagram, and the unit rating plate.
• Connect the line-voltage leads to the terminals on the
contactor inside the control compartment. Extend leads
through power wiring hole (
). Connect
L1
&
L2
directly to the contactor.
• 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. Use of rain tight conduit is recommended.
• See the unit wiring label for proper high and low voltage
wiring. Make all electrical connections in accordance
with all applicable codes and ordinances.
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.
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.
Overcurrent Protection
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.
Generally, the best fuse or breaker for any heat pump
is the smallest size that will permit the equipment to run
under normal usage and provide maximum equipment
protection. Properly sized fuses and breakers also prevent
nuisance trips during unit startup.
If a fuse blows or a
breaker trips, always determine the reason.
Do not
arbitrarily install a larger fuse or breaker and do not,
in any case, exceed the maximum size listed on the
data label of the unit.
Figure 5. Power Entry
Low Voltage
High Voltage
