Mitsubishi Heavy Industries FD Series User Manual Download

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Part Name

Regular Inspection

Preventive Maintenance*

Remarks

Part Name

Details of Inspection

Inspection Method

Criteria <Standard>

Details of Maintenance

Inspection

Interval

Maintenance Interval

(Used Hours/Duration)

Elapsed Years

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 rubber

Visual 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

- 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 required

Audible 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

- 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 generation

20,000 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 values

25,000 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.