
VRF-SVN33A-EN 25
Electrical Wiring
Power Wiring
• Multi-pole circuit breaker or disconnect is required to fully isolate the unit from all power.
• Install circuit breakers/disconnects in accordance with local and national codes.
• Select the power cable in accordance with relevant local and national regulations.
• Power cable specifications are based on an underground/ambient temperature of 86ºF (30ºC)
and single multi-conductor cables. If conditions are different from these, consult an electrical
installation expert and re-select the power cable. If the length of power cable exceeds 164.04 ft
(50 m), re-select the power cable considering the voltage drop.
• Do not use power cable that has exposed wire.
• Unbalanced power must be maintained within 10% of supply rating among all indoor units or
the unit will stop and an error code will be generated. (Significantly unbalanced power may
shorten the life of the system.)
• Use a power cable made out of incombustible material for the insulator (inner cover) and the
sheath (outer cover).
• Provide strain relief for power cables.
Follow this procedure:
1. Refer to Table 11 for power cable and circuit breaker specifications, and Table 12 for conduit
specifications.
WARNING
Avoid Risk of Fire or Explosion!
Do not let the power cable come into contact with the pipes inside the outdoor unit. If the
power supply cable touches the pipes, the vibration of the compressor will be transferred to
the pipes and can damage the power supply cables or pipes. The damage could result in fire or
explosion, causing death or serious injury.
Table 11. Circuit breaker and power cable specifications
Power RLA FLA
MCA MOPModel Hz V Fan1 Fan2
4TVH0036B100NB
60 208/230
16.9 0.6 0.6 23 40
4TVH0048B100NB 22.1 0.6 0.6 29 50
4TVH0053B100NB 26.0 0.6 0.6 34 55
Notes:
• RLA is based on AHRI 210/240 cooling standard condition (indoor temperature: 80°F (26.7°C) DB/67°F (19.46°C)
WB; outdoor temperature: 95°F (35°C) DB.
• Voltage tolerance is ± 10%.
• Maximum allowable voltage between phases is 2%.
• Abbreviations: RLA: Rated load ampere; FLA: Full load ampere; MCA: Minimum circuit amperes ; MOP: Maximum
overcurrent protective device (amperes).
Table 12. Cable conduit specifications
Name Temper grade Application conditions
Flexible PVC conduit PVC
If conduit is installed indoors and not exposed to outside
elements (embedded in concrete)
Class 1 flexible conduit Galvanized steel sheet
If conduit is installed indoors but exposed to outside
elements
Class 1 PVC-coated flexible
conduit
Galvanized steel sheet and
soft PVC compound
If conduit is installed outdoors and requires waterproofing
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