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[4] Parts Inspection and Replacement Intervals
The table below shows the recommended inspection and replacement intervals. Replacement interval is a
recommended replacement period and not the warranty period. Note that the replacement interval depends
on usage environment. Check the unit components periodically and replace them as necessary before
problems arise to prevent adverse effects on other parts.
Parts Inspection and Replacement Intervals
Parts Check item
Inspection
interval (times
per year)
Replace-
ment
interval
Refrigerant
circuit
Compressor High and low pressures, vibrations,
abnormal noises, insulation
resistance, loose terminals
2 40,000
hours
Air-side HEX High and low pressures, dirty fins 2 10 years
Water-side HEX High and low pressures, water
pressure loss
2 10 years
Solenoid valves Operation, leakage, clogging 2 7 years
4-way valves Operation, leakage, clogging 2 7 years
Check valves Operation, leakage, clogging 1 10 years
Electric expansion
valves
Operation 2 7 years
Strainers Difference between the outlet and inlet
temperatures
1 When major
maintenance
is performed
Refrigerant tank Difference between the outlet and inlet
temperatures
1 10 years
Capillary tubes Contact abrasion, vibrations 1 10 years
Pipes Contact abrasion, vibrations 1 10 years
Electrical
circuit
Solenoid valves, 4-way
valve coils
Insulation resistance 2 7 years
Electric heater
(compressor case)
Insulation resistance 2 20,000
hours
Fuses External appearance 2 8 years
Electronic substrates External appearance 2 8 years
Pressure switches and
sensors
Contact resistance at the contact,
friction wear on the capillaries
2 7–10 years
Terminal blocks Loose terminals 2 8 years
Wires and connectors Breakage, looseness, deterioration,
friction
2 10 years
Smoothing capacitor Water leakage, deformation 2 10 years
Heatsink cooling fan Insulation resistance, abnormal
sounds
2 10 years
Ventilation
system
Fans Balance 2 10 years
Motors Insulation resistance, abnormal
sounds, vibrations
2 6–10 years
[5] Safety, Ventilation, and Fire-Extinguishing Devices
Read their respective manuals and understand how to use them correctly. Perform regular inspection and
maintenance to keep them in good conditions.
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