Mitsubishi Electric CITY MULTI PURY-HP-TNU-A1 Manuel D'installation page 44

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 fire.
・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 check that the voltage across pins 1 and 5 of connector RYPN 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 connector (RYFAN1 and RYFAN2).
(To plug or unplug connectors, check that the outdoor unit fan is not rotating and that the voltage across pins 1 and 5 of connector RYPN has
dropped to 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 (RYFAN1 and RYFAN2) 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.
・When the outdoor unit is installed on the waterproof sheet, the sheet may become dirty due to the copper component seeped out from the unit. In
this case, installing a drain pan for centralized drainage is recommended.
12-1. Guideline for preventive maintenance
The following maintenance intervals indicate the estimated intervals of parts replacement and repair to be required as a result of periodic
inspections. They do not necessarily mean that replacement is required at the maintenance intervals.
The maintenance intervals do not indicate the warranty period.
Unit Parts
Compressor
Fan motor
Electronic expansion valve
Outdoor unit
Valve
Heat exchanger
Sensor
WT10508X02
Inspection Maintenance
interval interval
20,000 hours
1 year
5 years
20,000 hours
GB-42
Daily Maintenance
inspection inspection
O
O
O
O
O
O
Remarks