Part NameRegular InspectionPreventive Maintenance*
Remarks
Part NameDetails of InspectionInspection MethodCriteria <Standard>Details of Maintenance
Inspection
Interval
Maintenance Interval
(Used Hours/Duration)
Elapsed Years
123456789101112131415
Structural
component
Guard, etc.
- Check of peeling off and fl oating of paint coating
- Check of fractures and cracks of plastic parts
Visual inspection- There should be no extreme rust generation,
cracks, fracture, etc.
- Paintwork by repair coating
- Replace it if there is any damage, such as cracks
and fracture.
Every year
Before
the air-
conditioning
season
8 years
Cleaning object item
Frame, bottom plate, etc.
- Check of rust and peeling off of the heat insulation
material
- Check of peeling off and fl oating of paint coating
Visual inspection- There should be no extreme rust or damage of heat
insulation material
- If the heat insulation material is peeled off, repair
and stick it
- Paintwork by repair coating
8 years
Cleaning object item
Vibration-proof rubber
- Check of deterioration and hardening of rubberVisual and audible
inspection
- Vibration insulation function should not be
impaired
- Replace it when deteriorated or hardened
10 years
Ventilation
system
parts
Fan
Fan casing
- Visual check of vibration and balance
- Check of dust adhesion and appearance
Visual inspection
Visual inspection
- Should not be in an extremely vibrating condition
- There should be no extreme rust or deformation
- Replace it in case of vibration and extreme
unbalance
- Clean with a brush or wash with water in case of
extreme dust adhesion
10 years
Fan motor
- Sound audibility check
- Insulation resistance measurement
Audible inspection
500 V mega
- There should be no abnormal sound generation
- The resistance value should be 1 M or more
- When a bearing sound is loud, replace the bearing
- When the resistance value is 1 M or less, replace
the motor
20,000 Hr
Bearing
- Regular lubrication is requiredAudible inspection- There should be no abnormal sound generation- Replace parts regularly
15,000 Hr
Consumable
components
Refrigerant
system
parts
Compressor
- Sound audibility and vibration at the start-up,
operation, and stop
- Insulation resistance measurement (after
energizing the manufacturer designated time)
- Looseness of terminals and contact of wiring
Visual, audible, and
tactile inspection
500 V mega
Driver, visual inspection
- There should be no abnormal sound or vibration
- The resistance value should be 1 M or more
- There should be no looseness or contact
- Replace it if abnormal
- Replace it if the resistance value is 1 M or less
- Retighten. Correction of wiring path
20,000 Hr
Air heat exchanger
- Check the clogging and damage due to foreign
objects
- Gas leakage
Visual inspection
Gas detector
- There should be no clogging or damage
- No leakage should be detected
- Wash the air infl ow side in case of clogging
- Repair or replace it when gas leakage is detected
5 years
Cleaning object item
Due to atmospheric
dirt
Piping in the unit
- Sympathetic vibration, contact, and corrosion of
the piping in the unit
- Sympathetic vibration and contact of capillary tube
Visual inspection
Visual inspection
- There should be no abnormal sympathetic
vibration, sound, or corrosion
- There should be no abnormal sympathetic vibration
or contact wear
- Replace it or readjust the piping when extremely
corroded
- Replace it or readjust the piping when extremely
worn
20,000 Hr
Electronic expansion valve
- Operation check
- Operation sound by power on/off (pressure check)
Tactile inspection
Audible and tactile
inspection
- Circulation of refrigerant should be felt
- There should be driving sound and temperature
change
- Replace it when locking occurs
20,000 Hr
Electromagnetic valve, four
way switching valve, etc.
- Operation and insulation performances of
electromagnetic valve, four way switching valve, etc.
- Corrosion, abnormal sound
500 V mega
Visual and audible
inspection
- The resistance value should be 1 M or more
- There should be no abnormal sound or corrosion
- Replace it if the resistance value is 1 M or less
20,000 Hr
Container, etc.- Corrosion of accumulator, oil separator, etc.Visual inspection- There should be no abnormal corrosion- Repair coating in case of corrosion generation20,000 Hr
Protection
device
(security
parts)
Pressure
shutoff device
- Operation pressure, gas leakage, insulation
resistance
Pressure gauge, etc.- Operate it at a setting value
- Observe the rules specifi ed by the laws and
regulations
- Replace it if it does not operate within the
permissible range of setting values25,000 Hr
Fusible plug
- Appearance check (swelling of fusible alloy)Visual inspection- The fusible alloy should be in a normal position- Replace the device if fusible alloy is swelling out of
the normal position
15,000 Hr
[Mainly outdoor parts and built-in components]
*The distinction between the indoor and outdoor assumes the air conditioner for a store and a multiple-air conditioner for a building. This may vary depending on the configuration of the unit, such as equipment air conditioner.
Explanation of symbols
: Conduct the cleaning and adjustment according to the inspection result
: In case of abnormality after inspection, replace or repair the corresponding part.
: Conduct the periodic replacement (consumable components)
: Random failure
: Wear-out failure
Note 1) Random fault is an unexpected failure which occurs before
the wear is progressed, within the service life of the parts and
equipment. It is difficult to establish a technological measure
against the random fault. At the moment, statistical handling is the
only measure against the random fault.
Note 2) The elapsed year marked with * assumes the operating time
as 10 hours/day and 2500 hours/year in a normal operating
condition without frequent start/stop. This may vary according to
the operating condition. Please check the calculation basis of the
elapsed year when making a maintenance contract.
Note 3)
illustrates the estimated timing when the wear-out
failure starts and how the failure rate increases as the time passes.
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