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ELECTRICAL INFORMATION
WARNING
•
All power wiring and communication cable installation must
be performed by authorized service providers working in
accordance with local, state, and National Electrical Code
(NEC) regulations related to electrical equipment and
wiring, and following the instructions in this manual. Failure
to do so will lead to electric shock and bodily injury or
death.
•
Be sure that main power to the unit is completely off before
proceeding. Follow all safety and warning information
outlined at the beginning of this manual. Failure to do so
will cause electric shock and bodily injury.
•
Familiarize yourself with the location of the circuit breaker.
Be sure that a circuit breaker or some other emergency
power cutoff device is in place before any power wiring is
done to the system. Failure to do so will cause bodily injury
or death.
•
Never touch any power lines or live cables before all
power is cutoff to the system. To do so, will cause bodily
injury or death.
•
Undersized wiring will lead to unacceptable voltage at the
unit and will cause a fire, which will cause bodily injury or
death.
•
Properly ground all outdoor units and DOAS units. Ground
wiring must always be installed by a qualified technician.
Ground wiring is required to prevent accidental electrical
shock during current leakage, which will cause bodily injury
or death.
•
Install appropriately sized breakers / fuses / overcurrent
protection switches and wiring in accordance with local,
state, and NEC regulations related to electrical equipment
and wiring, and following the instructions in this manual.
Generated overcurrent could include some amount of direct
current. Using an oversized breaker or fuse will result in
electric shock, physical injury or death. There is, also,
equipment malfunction and property damage.
•
Do not connect ground wire to refrigerant, gas, or water
piping; to lightning rods; to telephone ground wiring; or to
the building plumbing system. Failure to properly provide a
NEC-approved earth ground can result in electric shock,
physical injury or death. There is, also, equipment
malfunction and property damage.
•
Consider ambient conditions (temperature, direct sunlight,
inclement weather, etc.) when selecting, installing, and
connecting the power wiring.
•
If there is a possibility of reversed phase, phase loss,
momentary blackout, or the power goes on and off while
the system is operating, install a field-supplied phase loss
protection circuit. If the system operates in reversed phase,
etc., it will damage the compressors and other components.
•
Verify the power imbalance is no greater than 2% between
phases at each outdoor unit frame. Power imbalances will
damage the components.
Field Wiring
Wires should be purchased separately for installation of
the product.
Determine the Size of the Main Power Line
The unit’s nameplate states the voltage unit’s MCA. The
main power lines to the unit should be sized accordingly.
The nameplate is located on the outside of the unit on
the control panel side
Power Wiring / Communication Cable
Connection
Unit can be connected 208/230V or 460V. Be sure that
proper internal connection should be followed as below.
If jobsite has a 208/230V power supply, follow wiring
guide of ‘Case 2’, ‘Case 1’ is the Factory default setting.
Figure 12: Power connection guide (460V or 208/230V)
Best practice dictates using solderless ring or fork
terminals at all power wiring and communication cable
terminations. Use copper bearing ring or fork terminals;
Do not use galvanized or nickel plate over steel. Use
appropriate crimping tool to attach the ring or fork
terminals at all power wiring and control cable
terminations. To install:
•
Firmly attach the wire; secure in a way to prevent external
forces from being imparted to the terminal block.
•
Use an appropriately sized screwdriver for tightening the
terminals
.
•
Do not over tighten the connections; over tightening will
damage the terminal
