Mitsubishi Electric PFD-P250VM-E Service Manual page 39

Details of Maintenance/Inspection
Inspection
Unit Parts
Cycle
Fan motor
Bearing
6
months
Fan belt
Air filter
3
months
Drain pan
6
Drain hose
months
Linear
expansion valve
1
year
Heat exchanger
Float switch
6
months
Display lamp
1
year
Compressor
6
months
Fan motor
Linear
expansion valve
4-way valve
Heat exchanger
1
year
Pressure switch
Inverter cooling
fan
Check points
· Check for unusual noise
· Measure the insulation
resistance
· Check for unusual noise
· Check for excessive slack
· Check for wear and tear
· Check for unusual noise
· Check for clogging and tear
· Clean the filter
· Check for clogging of the
drainage system
· Check for loosened bolts
· Check for corrosion
· Make sure the loop of the hose
has water to prevent air from
traveling through the hose
(Fill the hose with water)
· Check for clogging of the
drainage system
· Perform an operation check
using the operation data
· Check for clogging, dirt, and
damage
· Check the outer appearance
· Make sure its free of foreign
objects
· Make sure the lamp comes on
· Check for unusual noise
· Check insulation resistance
· Check for loosened terminals
· Check for unusual noise
· Measure insulation resistance
· Perform an operation check
using the operation data
· Perform an operation check
using the operation data
· Check for clogging, dirt, and
damage
· Check for torn wire, fraying,
and unplugged connectors
· Check insulation resistance
· Check for unusual sound
· Measure insulation resistance
· Look for abnormal history
Assessment
· Free of unusual noise
· Insulation resistance over 1MΩ
· Free of unusual noise
· Resistance (3-4kg/belt)
· Adequate amount of slack=5mm
· Belt length=no longer than
102% of the original length
· Free of wear and tear
· Free of unusual noise
· Clean, free of damage
· Clean, free of clogging
· Free of loose screws
· No major disintegration
· Clean, free of clogging
· Free of wear and tear
· Adequately controls the air
temperature
(Check temperature change on
the centralized controller)
· Clean, free of clogging or
damage
· Free of frayed or cut wires
· Free of foreign objects
· Comes on when the output is
on
· Free of unusual sound
· Insulation resistance over 1MΩ
· Free of loosened terminals
· Free of unusual sound
· Insulation resistance over 1MΩ
· Adequately controls the air
temperature
(Check temperature change on
the centralized controller)
· Adequately controls the air
temperature
· Clean, free of clogging or
damage
· No frayed or cut wires or
unplugged connectors
· Insulation resistance over 1MΩ
· Free of unusual sound
· Insulation resistance over 1MΩ
· No heatsink overheat protection
(4230,4330) on the report
37
What to do
Replace when insulation
resistance is under 1MΩ
If the noise doesn't stop after
lubrication, change the oil.
Add lubricant once a year.
Adjust the belt
Replace if the belt length
exceeds 2% of the original
length, worn, or used over 8000
hours
Clean the filter
Replace if extremely dirty or
damaged
Clean if dirty or clogged
Tighten bolts
Replace if extremely worn
Clean if dirty or clogged
Replace if extremely worm
Replace if malfunctioning
Clean
Replace if damaged or
extremely worn
Remove foreign objects
Replace if the light does not
come on when the power is on
Replace if insulation resistance
goes below 1MΩ (under the
condition that the refrigerant
is not liquefied)
Tighten loosened bolts
Replace if insulation resistance
goes below 1MΩ
Replace if malfunctioning
Replace if malfunctioning
Clean
Replace when cut or shorted,
when the insulation resistance
goes below 1MΩ, or if there is a
history of abnormal operation
Replace when producing unusual
sounds, when insulation resistance
goes under 1MΩ, or if there is a
history of abnormal operation.