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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
123456789101112131415
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 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
Automatic louver
motor
- Insulation resistance, abnormal sound generation 500 V mega, audible
inspection
- The resistance value should be 1 M or more,
there should be no abnormal sound
- Replace it if the resistance value is 1 M 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 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 or less
20,000 Hr
Dewing preventing
heater
- Insulation resistance, appearance check 500 V mega, visual
inspection
- The resistance value should be 1 M or more,
there should be no abnormality
- Replace it if the resistance value is 1 M 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 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
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 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 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 specifi 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 specifi 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