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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.
•
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.
Note:
•
Consider ambient conditions (temperature, direct sunlight,
inclement weather, etc.) when selecting, installing, and
connecting the power wiring.
•
Properly ground all DOAS units. Ground wiring must always
be installed by a qualified technician. Improperly ground
wire can cause communication problems from electrical
noise, and motor current leakage.
•
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.
•
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 will include some amount of direct
current. Using an oversized breaker or fuse will result in
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 property damage
and equipment malfunction.
•
Verify the power imbalance is no greater than 2% between
phases at each outdoor unit frame. Power imbalances will
damage the components.
Separating Power Wiring and
Communication Cables
• Avoid running the power wiring and communication
cable alongside each other; there is a strong
likelihood of operation malfunction due to electrostatic
and electromagnetic interference. Do not run both in
the same conduit.
• If running the power wiring and communication cable
alongside each other cannot be avoided, see the
table below for minimum required distances
Table 21: Power Wire and Communication Cable Minimum
Required Separation Allowable Distance
Capacity of Power Supply Wiring(Current)
Minimum Distance
1,2
100V or more
10A
12 inches
50A
20 inches
100A
40 inches
Exceeding 100A
60 inches
1
The figures above are based on parallel lengths up to 328 feet long. For lengths in
excess of 328 feet, the distances will have to be recalculated in direct proportion to the
additional line lengths involved.
2
If the power supply waveform continues to exhibit some distortion, the space between
the power wiring and communication cable must be increased
.
Note:
•
Do not secure the power wiring and communication
cables together. It will result in equipment malfunction.
•
Do not run the power wiring and the communication
cable in the same conduit. It will result in equipment
malfunction
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