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Caution for Insulation Resistance
If total unit insulation resistance is lower than 1 megohm, the compressor insulation resistance may
be low due to retained refrigerant in the compressor. This may occur if the unit has not been used
for long periods.
1. Disconnect the cables to the compressor and measure the insulation resistance of the
compressor itself. If the resistance value is over 1 megohm, then insulation failure has occurred
of other electrical parts.
2. If the insulation resistance is less than 1 megohm, disconnect the compressor cable from the
inverter PCB. Then, turn on the main power to apply current to the crankcase heater.
After applying current for more than 3 hours, measure insulation resistance again. (Depending on
the air conditions, pipe length or refrigerant conditions, it may be necessary to apply the current
for a longer period of time.) Check the insulation resistance and reconnect the compressor.
If the leakage breaker is activated, check the recommended size shown in Table 6.1.
1. Confirm that field-supplied electrical components (main switch fuse, fuse-free breaker, earthleakage
breakers, wires, conduit connectors and wire terminals) have been properly selected according to the
electrical data given in the Technical Catalog I of the unit and ensure that the components comply with
national and local codes.
2. Use shielded wires (≥0.75mm
shall be less then 1000m, and size of shielded wire shall comply with local codes.)
3. Check to ensure that the terminal for power source wiring (terminals "L1" to "L1" and "N" to "N" of each
terminal board: AC380-415V, terminals "R" to "L1" and "T" to "L2" of each terminal board: AC220V) and
intermediate wiring (Operating Line: terminals "1" to "1" and "2" to "2" of each terminal board: DC5V)
between the indoor unit and the outdoor unit coincide correctly. If not, some component will be
damaged.
NOTE
2
) for field wiring to protect noise obstacle. (Total length of shielded wire
27
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