Periodic Checks - Mitsubishi PFD-P250500VM-A Operation Manual

15. Periodic Checks

Table 1 Maintenance and Checks
Unit Parts Check frequency
Fan motor
Bearing
6 months
Fan belt
Air filter 3 months
Drain pan
6 months
Drain hose
Linear
expansion
valve 1 year
Heat
exchanger
Float switch 6 months
Display
1 year
lamp
Compres-
sor
6 months
Fan motor
Linear
expansion
valve
Heat
exchanger
1 year
Pressure
switch
Cooling fan
for inverter
s s s s s Relocating or scrapping the unit.
• Specialist skills are required for relocation of the unit. Please contact your retailer or a consultant specified by the manufacturer.
• The coolant must be recovered before the unit is scrapped. Please contact your retailer or a consultant specified by the manufacturer.
Checks
• Check operating noise.
• Measure insulation resistance.
• Check operating noise.
• Check belt tension.
• Visually check for wear and damage.
• Check operating noise.
• Visually check for contamination and
damage.
• Clean
• Check for contamination and blockage
of drain.
• Check for loose mounting screws.
• Check for deterioration.
• Check sealing of hose (inject water into
hose).
• Check for contamination and blockage
of drain.
• Check for deterioration.
• Check action using operation data.
• Check for blockage, contamination, and
damage.
• Check appearance.
• Check for adhesion of foreign matter.
• Check lighting of lamp.
• Check operating noise.
• Measure insulation resistance.
• Visually check for loose terminals.
• Check operating noise.
• Measure insulation resistance.
• Check action using operation data.
• Check for blockage, contamination, and
damage.
• Check for broken wiring, deterioration,
and unconnected connectors.
• Measure insulation resistance.
• Check operating noise.
• Measure insulation resistance.
• Check fault history.
Evaluation criteria
• No abnormal noises.
• Insulation resistance 1 MΩ or more.
• No abnormal noises.
• Deflection load of 3 - 4kg per belt. Opti-
mum deflection of 5mm.
• Maximum stretch in belt circumference
of 2% in comparison to initial circumfer-
ence.
• No wear or damage.
• No abnormal noises.
• No contamination or damage.
• No contamination or blockage.
• No loose screws.
• No significant deterioration.
• No contamination or blockage.
• No significant deterioration.
• Appropriate temperature change in re-
lation to change in control opening.
• No blockage, contamination or damage.
• No deterioration or broken wiring.
• No foreign matter.
• Lit at output ON.
• No abnormal noises.
• Insulation resistance 1 MΩ or more.
• No loose terminals.
• No abnormal noises.
• Insulation resistance 1 MΩ or more.
• Appropriate temperature change in re-
lation to change in control opening.
• No blockage, contamination or damage.
• No broken wiring, deterioration, or un-
connected connectors.
• Insulation resistance 1 MΩ or more.
• No abnormal noises.
• Insulation resistance 1 MΩ or more.
• No heat-sink heating protection (4230,
4330) in fault history.
Maintenance
Replace if insulation has deteriorated.
Replace if abnormal noises continue de-
spite replenishing oil.
Replenish oil annually.
Adjust tension.
Replace if stretch in belt circumference
is 2% or more, or if belt has been in use
for 8000 hours or more.
Replace if belt is worn or damaged.
Clean
Replace if filter is significantly contami-
nated or damaged.
Clean if contaminated or blocked.
Tighten screws.
Replace if deterioration is significant.
Clean if contaminated or blocked.
Replace if deterioration is significant.
Replace if the valve itself is the cause of
problems in operation.
Clean
Replace if wiring is broken or deteriora-
tion is significant.
Clean if foreign matter present.
Replace lamp if not lit at output ON.
Replace if insulation has deteriorated
while coolant has been circulating.
Tighten terminals if loose.
Replace if insulation has deteriorated.
Replace if the valve itself is the cause of
problems in operation.
Clean
Replace if wiring is broken, shorted, or
has significantly deteriorated, or if insu-
lation has deteriorated.
Replace in case of abnormal noises, if
insulation has deteriorated, or if a fault
has occurred.
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