Mitsubishi Electric CITY MULTI PUHY-P-YKB-A1 Manuel D'installation page 49

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12. Inspection and maintenance

Only qualified personnel must relocate or repair the unit. Do not attempt to disassemble or

alter the unit.

- Failure to do so will result in refrigerant leakage, water leakage, serious injury, electric shock, or

・While the unit is turned on, the compressor will remain energized even when it is stopped. Before inspecting the

inside of the control box, turn off the power, keep the unit off for at least 10 minutes, and confirm that the capacitor

voltage (inverter main circuit) has dropped to 20 VDC or less. (It takes about 10 minutes to discharge electricity

after the power supply is turned off.)

・Control boxes house high-voltage and high-temperature electrical parts. They may still remain energized or hot

after the power is turned off.

・Perform the service after disconnecting the fan board connector (CNINV) and the inverter board connector (CN1).

(To plug or unplug connectors, check that the outdoor unit fan is not rotating and that the voltage of capacitor in the

main circuit is 20 VDC or below. The capacitor may collect a charge and cause an electric shock when the outdoor

unit fan rotates in windy conditions. Refer to the wiring nameplate for details.)

Reconnect the connector (CNINV) back to the fan board and reconnect the connector (CN1) back to the inverter

board after servicing.

・Unit components may be damaged after long use of the unit, resulting in a performance drop or the unit becoming a

safety hazard. To use the unit safely and maximize its life, it is recommended that a maintenance contract with a

dealer or qualified personnel be signed. If the contract is signed, service technicians will periodically inspect the unit

to identify any damage at an early stage, and take appropriate measures.