Fujitsu AUYG18LVLB Design & Technical Manual page 218

WARNING
• Do not start operation until the refrigerant is charged completely. The compressor will fail if it is
operated before the refrigerant piping charging is complete.
• Transmission cable between indoor unit and outdoor unit is 230 V.
• Be sure not to remove thermistor sensor etc. from power wiring and connection wiring. Com-
pressor may fail if operated while removed.
• Start wiring work after closing branch switch and over current breaker.
• Use an earth leakage breaker that is capable of handing high frequencies. Because the outdoor
unit is inverter controlled, a high-frequency earth leakage breaker is necessary to prevent a mal-
function of the breaker itself.
• When using an earth leakage breaker that has been designed solely for ground fault protection,
be sure to install a fuse-equipped switch or circuit breaker.
• Do not connect the AC power supply to the transmission line terminal board. Improper wiring
can damage the entire system.
• Do not use crossover power supply wiring for the outdoor unit.
• If the temperature surrounding the breaker is too high, the amperage at which the breaker cuts
out may decrease.
4-1. Precaution for electrical wiring
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4. Wiring design