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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
indoor
[Mainly
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
Part Name
Details of Inspection
Decorative panel
- Check of dirt and scratch
(design part)
- Check of rust and peeling off of the heat insulation
Structural
Frame, bottom
material
component
plate, etc.
- Check of peeling off and fl oating of paint coating
Vibration-proof
- Check of deterioration and hardening of rubber
rubber
- Check the clogging of foreign matters and the fl ow
Drain system
of drain water
Drain pan
parts
- Check of peeling off and fl oating of paint coating
- Sympathetic vibration, contact, and corrosion of
the piping in the unit
Piping in the unit
- Sympathetic vibration and contact of capillary tube
Refrigerant
system parts
- Operation check
Electronic
- Operation sound by power on/off (pressure check)
expansion valve
- Circuit insulation resistance check
Electric component
- Terminal part, connector looseness check
box
Electric and
Transformer
- Output voltage measurement
electronic
parts
- Open, short circuit, earth, appearance check
Temperature sensor
Remote control
- Check the controllability by the operation
switch
- Check of deterioration and hardening of thermal
Thermal insulation
insulation
Pump
- Sound audibility check
Water system
parts
Flow switch
- Operation check
- Water leakage
Heat exchanger
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.
14
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.
Regular Inspection
Inspection Method
Criteria <Standard>
Visual inspection
- There should be no extreme dirt, scratches, or
deformation
Visual inspection
- There should be no extreme rust or damage of
heat insulation material
Visual and audible
- Vibration insulation function should not be
inspection
impaired
Visual inspection
- There should be no drainage clogging
- There should be no abnormal rust generation and
hole opening
Visual inspection
- There should be no abnormal sympathetic
vibration, sound, or corrosion
Visual inspection
- There should be no abnormal sympathetic
vibration or contact wear
Tactile inspection
- Circulation of refrigerant should be felt
Audible and tactile
- There should be driving sound and temperature
inspection
change
500 V mega
- The resistance value should be 1 MΩ or more
Driver, visual inspection
- There should be no looseness at the connecting part
- There should be no deposited foreign matter
- There should be no abnormal display
Tester
- Output voltage should be within a specifi ed value
Tester, visual inspection - Should be of a specifi ed resistance value
- There should be no cracking or discoloration
Visual inspection
- LCD should display as operated
Visual and audible
- Thermal insulation function should not be impaired - Replace it when deteriorated or hardened
inspection
Audible inspection
- There should be no abnormal sound generation
Tester
- ON-OFF should operate normally
Visiual inspection
- There should be no leakage.
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.
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)
Preventive Maintenance*
Inspection
Maintenance Interval
Details of Maintenance
Interval
(Used Hours/Duration)
- Cleaning with neutral detergent, paintwork by repair
coating
- If the heat insulation material is peeled off , repair
and stick it
- Paintwork by repair coating
- Replace it when deteriorated or hardened
10 years
- Cleaning of drain pan, inclination check
- Repair coating or replace the drain pan depending
on the problem level
- Replace it or readjust the piping when extremely
corroded
20,000 Hr
- Replace it or readjust the piping when extremely
worn
Every year
- Replace it when locking occurs
Before
20,000 Hr
the air-
conditioning
- Clean with a brush in case of extreme dust adhesion
season
- Replace it if the resistance value is 1 MΩ or less
25,000 Hr
- Retighten or reinsert it if there is looseness
- Replace it if there is voltage abnormality
10 years
- Replace it in case of disconnection and short circuit
- Replace it in case of failure of the following capability
25,000 Hr
of control and the display
10 years
- When abnormal sound is loud, replace the pump
20,000 Hr
- Replace it in case of malfunction
20,000 Hr
- Repair or replace it when gas and/or water leakage
is detected
Note 3)
illustrates the estimated timing when the wear-out
failure starts and how the failure rate increases as the time passes.
: Random failure
: Wear-out failure
Elapsed Years
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15
8 years
8 years
8 years
5 years
5 years
Remarks
Cleaning object item
Cleaning object item
Cleaning object item
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