Multi F Engineering Manual
Table Of Contents
• 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 federal regulations related to electrical equipment and wiring, and following the
manufacturer product diagrams, requirements, and instructions in this manual. Electric shock can cause physical injury or death.
• Be sure that main power to the unit is completely off before installing. Follow all safety and warning information. Failure to do so will cause
electric shock, resulting in bodily injury or death.
• Install a main shutoff switch or circuit breaker that interrupts all power sources simultaneously (circuit breaker must be resistant to elec-
tromagnetic currents). Be sure that the 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.
• Power wiring and communication cable sizes must comply with all applicable federal, state, and local codes. Undersized wiring will lead to
unacceptable voltage at the unit and will cause a fire, which will cause bodily injury or death.
• Properly ground the outdoor unit, 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, which will cause bodily injury or death.
• 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 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 electric shock, causing physical injury or death.
•
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. Failure to properly provide an NEC-approved earth ground can result in electric shock, fire, resulting in physical injury or
death.
• Consider ambient conditions (temperature, direct sunlight, inclement weather, etc.) when selecting, installing, and connecting the power wiring.
• Properly ground the outdoor unit, indoor units, and branch distribution units. Ground wiring must always be installed by a trained technician.
Improperly grounded wire can cause communication problems from electrical noise, and motor current leakage.
NOTE
• 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.
• Do not operate the air conditioning system until the refrigerant piping installation is complete. Operating the system before refrigerant
piping is finalized will damage the compressor.
General Information
ELECTRICAL CONNECTIONS
• Multi F and Multi F MAX systems operate at 1Ø, 208-230V, 60Hz, and power is wired to
the outdoor unit only. The outdoor unit will supply power to the indoor units and the branch
distribution units (Multi F MAX systems only) through the communication / connection
(power) cable.
• Power supply to the outdoor unit must be selected based on NEC and local codes. Maxi-
mum allowable voltage fluctuation ±10% or nameplate rated value.
• Power wiring to the outdoor unit(s) must be solid or stranded, and must comply with all
local and national electrical codes.
• Properly ground the outdoor unit and indoor unit per NEC and local codes.
• Ground wire must 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 or control cover for circuit and terminal block diagrams.
• Always match color codes of each wire and follow wiring diagram.
•
Do not install power wiring to the outdoor unit and the communication / connection (power) cable to the indoor unit in the same conduit.
Use separate conduits.
Power Supply / Power Wiring Specifications
Figure 44: Multi F / Multi F MAX Outdoor Unit
Power Wiring.
7/16" ± 1/8"
13/16
"
GN/YL
Power Wiring, Ground
to Outdoor Unit
Always have a trained service provider properly ground the outdoor unit. If the outdoor unit is not properly grounded, there is a risk of electric shock,
physical injury, or death.
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ELECTRICAL CONNECTIONS | 55
Electrical Connections
MULTI
F
MAX
MULTI
F