14
MAINTENANCE AND INSPECTION GUIDELINE OF MAIN PARTS OF HYDRO MODULE UNIT AND OUTDOOR UNIT
This table indicates the details of regular inspection items and their intervals
(inspection interval), and the timing of parts replacement under a normal
use condition. If the equipment falls into a certain category specified
by the laws and regulations of each country, conduct the maintenance
and inspection according to the specified rules too. As to the preventive
maintenance, the regular inspection interval is indicated as the “inspection
interval,” and the predicted interval of the “implementation of cleaning and
adjustment” or “implementation of parts replacement and repair” according
to the result of the regular inspection is indicated as the “maintenance
interval.” As to the cleaning and adjustment, the timing is set to prevent the
deterioration of parts and the degradation of performance. As to the parts
replacement and repair after the inspection, the timing is set by estimating
the operation time or use time, when the wear-out failure period is reached.
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.
[Mainly
indoor
parts and built-in components]
*The distinction between the indoor and outdoor assumes the air conditioner for a store and a multiple-air conditioner including hydro module unit for a building. This may vary depending on the configuration of the unit.
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
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15
Structural
component
Decorative panel
(design part)
- Check of dirt and scratch
Visual inspection
- There should be no extreme dirt, scratches, or
deformation
- Cleaning with neutral detergent, paintwork by repair
coating
Every year
Before
the air-
conditioning
season
8 years
Cleaning object item
Frame, bottom
plate, etc.
- Check of rust and peeling o
ff
of the heat insulation
material
- Check of peeling o
ff
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 o
ff
, 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
Drain system
parts
Drain pan
- Check the clogging of foreign matters and the
fl
ow
of drain water
- Check of peeling o
ff
and
fl
oating of paint coating
Visual inspection
- There should be no drainage clogging
- There should be no abnormal rust generation and
hole opening
- Cleaning of drain pan, inclination check
- Repair coating or replace the drain pan depending
on the problem level
8 years
Cleaning object item
Refrigerant
system parts
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/o
ff
(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
Electric and
electronic
parts
Electric component
box
- Circuit insulation resistance check
- Terminal part, connector looseness check
500 V mega
Driver, visual inspection
- The resistance value should be 1 M
Ω
or more
- There should be no looseness at the connecting part
- There should be no deposited foreign matter
- There should be no abnormal display
- Clean with a brush in case of extreme dust adhesion
- Replace it if the resistance value is 1 M
Ω
or less
- Retighten or reinsert it if there is looseness
25,000 Hr
Transformer
- Output voltage measurement
Tester
- Output voltage should be within a speci
fi
ed value
- Replace it if there is voltage abnormality
10 years
Temperature sensor
- Open, short circuit, earth, appearance check
Tester, visual inspection - Should be of a speci
fi
ed resistance value
- There should be no cracking or discoloration
- Replace it in case of disconnection and short circuit
5 years
Remote control
switch
- Check the controllability by the operation
Visual inspection
- LCD should display as operated
- Replace it in case of failure of the following capability
of control and the display
25,000 Hr
Water system
parts
Thermal insulation
- Check of deterioration and hardening of thermal
insulation
Visual and audible
inspection
- Thermal insulation function should not be impaired - Replace it when deteriorated or hardened
10 years
Pump
- Sound audibility check
Audible inspection
- There should be no abnormal sound generation
- When abnormal sound is loud, replace the pump
20,000 Hr
Flow switch
- Operation check
Tester
- ON-OFF should operate normally
- Replace it in case of malfunction
20,000 Hr
Heat exchanger
- Water leakage
Visiual inspection
- There should be no leakage.
- Repair or replace it when gas and/or water leakage
is detected
5 years
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
MCD012A001_01_EN.indd 14
MCD012A001_01_EN.indd 14
2022/8/3 16:46:09
2022/8/3 16:46:09
