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18. MAINTENANCE AND INSPECTION GUIDELINE OF MAIN PARTS OF PACKAGED AIR CONDITIONER
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.
Note 4) The inspection timing of filter is basically every week. However, the contamination
state varies depending on the type of filter and the use condition. Therefore,
conduct the inspection in arbitrary cycles according to the use condition.
[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 for a building. This may vary depending on the configuration of the unit, such as equipment air conditioner.
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
Intake/outlet grills
- Visual check of dirt and scratch
- Outlet grill louver operation check
Visual inspection
- There should be no extreme scratches or deformation
- Repair or replace it if deformed or damaged
- Replace the bearing, motor, etc. when malfunctioning
8 years
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
Filter
- Visual check of dirt and breakage
Visual inspection
- Filter material should be seen through
- There should be no breakage or deformation
- Clean it if it is dirty
- Replace it if it is broken
Every week
Note 4
5 years
Consumable
components
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
Every year
Before the air
conditioning
season
13 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
Ω
or more
- When a bearing sound is loud, replace the bearing
- When the resistance value is 1 M
Ω
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
Automatic louver
motor
- Insulation resistance, abnormal sound generation
500 V mega, audible
inspection
- The resistance value should be 1 M
Ω
or more, there
should be no abnormal sound
- Replace it if the resistance value is 1 M
Ω
or less
20,000 Hr
Drain system
parts
Drain pan
- Check the clogging of foreign matters and the
fl
ow of
drain water
- Check of peeling off 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
Drain pump
- Check the drainage condition
- Check the clogging and dirt of the water supply and
drainage outlet
- Insulation resistance
Visual inspection
Visual inspection
500 V mega
- Should be drained normally
- There should be no clogging or dirt
- The resistance value should be 1 M
Ω
or more
- Replace it in case of drain defect
- Clean it in case of clogging and dirt
- Replace it if the resistance value is 1 M
Ω
or less
20,000 Hr
Dewing preventing
heater
- Insulation resistance, appearance check
500 V mega, visual
inspection
- The resistance value should be 1 M
Ω
or more, there
should be no abnormality
- Replace it if the resistance value is 1 M
Ω
or less
20,000 Hr
Float switch
- Operation check
Tester
- ON-OFF should operate normally
- Replace it in case of malfunction
20,000 Hr
Refrigerant
system parts
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 in
fl
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
Ω
or more
- There should be no abnormal sound or corrosion
- Replace it if the resistance value is 1 M
Ω
or less
20,000 Hr
Electric and
electronic
parts
Electric component
box
(including inverter)
- 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
Switching power
source 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
Humidistat
- 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
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
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