Inspection And Maintenance - Mitsubishi Electric PURY-(E)P-YLM-A (-BS) Installation Manual

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 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.
<Reference> Inspection and maintenance cycles of major components
Major component
Compressor
Fan motor
Electronic board
Heat exchanger
Expansion valve
Valve (e.g., Linear expansion valve, 4-way valve)
Sensor (e.g., Thermistor, Pressure sensor)
・Only the major components are listed in the table. Check with the maintenance contract for details.
・"Maintenance cycle" is not a warranty period.
・"Maintenance cycle" indicates the estimated cycle period in which each component should be replaced or
repaired. Use these values when making maintenance plans (such as estimating the cost for inspection and
maintenance). Depending on the contents of the maintenance contract, the actual inspection and maintenance
cycles may be shorter than the cycles in the table.
・The cycle periods in the table above are estimated under the following conditions.
- The outdoor unit is not turned on or off frequently. (The normal number of times a unit is turned on/off in an
hour is considered to be six or less, although this varies depending on the unit model.)
- The operation time of the outdoor unit is assumed to be 10 hours a day and 2,500 hours a year.
・Under the following conditions, inspection and maintenance needs to be performed sooner than the cycle
periods in the table above.
- The unit is used in a place where the temperature or humidity is high or changes significantly.
- The unit is used in a place where power voltage, frequency, or waveform changes significantly.
- The unit is used in a place where excessive vibration or impact occurs.
- The unit is used in a place where dust, salt, harmful gas such as sulphurous acid gas or hydrogen sulphide, or
oil mist is present.
- The unit is turned on or off frequently, or the unit is operated for a long time, such as 24 hours a day.
WT07282X01
Inspection Maintenance cycle
cycle (replacement or repairs)
20,000 hours
20,000 hours
25,000 hours
1 year 5 years
20,000 hours
20,000 hours
5 years
GB-56