Engineering Manual

General Information
WIRING CONNECTIONS
Power Wiring and Communications Cable Installation
For both Multi F and Multi F MAX systems, power is wired to the outdoor unit only. The outdoor unit will supply power to the branch distribu-
tion units (Multi F MAX systems only) and the indoor units through the power wiring / communications cable.
• All power (line voltage) wiring and communication cable installation must be performed by trained service providers working in accordance
with local, state, and National Electrical Code (NEC) / UL / ETL federal regulations related to electrical equipment and wiring, and follow-
ing the manufacturer product diagrams, requirements, and instructions in this manual. Electric shock can cause physical injury or death.
• Undersized wiring may lead to unacceptable voltage at the unit and may cause unit malfunction and be a fire hazard.
• Properly ground the Multi Zone outdoor, indoor units, and branch distribution units. Ground wiring must always be installed by a trained
technician. Ground wiring is required to prevent accidental electrical shock during current leakage.
•
Do not connect ground wire to refrigerant, gas, sewage, or water piping; to lightning rods; to telephone ground wiring; or to the building
plumbing system. Use clamps to prevent the wires from touching the piping. Failure to properly provide a National Electrical Code-approved
earth ground can result in explosion, HOHFWULFVKRFN¿UHSK\VLFDOLQMXU\RUGHDWK
• Verify that the branch switch and circuit breaker are set to OFF before installing the wiring system. Electric shock can cause physical injury or death.
• Install appropriately sized breakers / fuses / overcurrent protection switches and wiring in accordance with local, state, and National Electri-
cal Code regulations related to electrical equipment and wiring, and following the instructions in this manual. Using an oversized breaker
or fuse may result in electric shock, physical injury or death.
• Consider ambient conditions (temperature, direct sunlight, inclement weather, etc.) when selecting, installing, and connecting the power wiring.
• Properly ground the Multi Zone outdoor and indoor unit. Improperly grounded wire can cause communication problems from electrical
noise, and motor current leakage. Ground wiring must always be installed by a trained technician.
• If the system operates in reversed phase, it may damage the compressors and other components.
• 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.
•
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 National Electrical Code-approved earth ground can result in property damage and equipment malfunction.
• Install appropriately sized breakers / fuses / overcurrent protection switches and wiring in accordance with local, state, and National Electri-
cal Code regulations related to electrical equipment and wiring, and following the instructions in this manual. Using an oversized breaker
or fuse may result in equipment malfunction and property damage.
• For power to the outdoor unit, use only copper wiring that is solid or stranded and complies with all local and national electrical codes.
•
Do not use a multi-conductor cable with more than five (5) wires in one (1) core.
• Power wiring and communications cable sizes must comply with applicable federal UL / ETL, state, and local codes.
•
Do not operate the air conditioning system until the refrigerant piping installation is complete. Operating the system before refrigerant
piping is finalized may damage the compressor.
• Install a ground wire for the outdoor units, indoor units, and branch distribution units.
• Install a main shutoff switch or circuit breaker that interrupts all power sources simultaneously (circuit breaker should be resistant to elec-
tromagnetic currents).
• Use ring terminals to attach the wiring. Verify that all power wiring and communications cable terminals are securely attached. Ensure
enough slack is included in the wiring and cables to avoid damaging the connections.
• Use a conduit to protect the power wiring.
Power Supply / Power Wiring Specifications
• Multi F and Multi F MAX systems operate at 1Ø, 208-230V, 60Hz. Power supply, wire type and size should be selected based on National
Electrical Code and local codes. Maximum allowable voltage fluctuation ±10% or nameplate rated value.
• Properly ground the outdoor units per National Electrical Code and local codes.
• For power to the outdoor units, use field-supplied copper wiring that is solid or stranded, and shielded with the wires separately insulated.
• Ground wire should be longer than the common power / communication wires.
• Connect the wiring firmly so the wires cannot be easily pulled out.
• Refer to the inside of the chassis cover for circuit and terminal block diagrams for your model unit. Always match color codes of each wire and
follow wiring diagram.Outdoor unit wiring can be found on the inside of the outdoor unit control cover.
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210 | WIRING CONNECTIONS
Multi F and Multi F MAX Indoor Unit Engineering Manual
MULTI
F
MAX
MULTI
F