Mitsubishi Electric PUHY-P250YNW-A Service Handbook page 277

[8-15 Maintenance/Inspection Schedule ]
3. Details of Maintenance/Inspection
Inspection
Unit Parts
Cycle
Fan motor
6
months
Bearing
6
months
Fan belt
6
months
Air filter
3
months
Drain pan
6
months
Drain hose
6
months
Linear
1
expansion valve
year
1
Heat exchanger
year
Float switch
6
months
Display lamp
1
year
(LED)
Compressor
6
months
Fan motor
6
months
Linear
expansion valve
1
year
4-way valve
1
year
Heat exchanger
1
year
Pressure switch
1
year
78
- chapter 8
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
. Check for clogging of the
drainage system
. Chec
k for corrosion
. Check the drainage of the drain
trap
. 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
Assessment
. Free of unusual noise
. Insulation resistance over 1M
. Free of unusual noise
. Resistance (30~40N/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
. Clean, free of clogging or
damage
. Free of frayed or cut wires
. Free of foreign objects
. Comes on when the output is
on
. Rapid drop in brightness
. Free of unusual sound
. Insulation resistance over 1M
. Free of loosened terminals
. Free of unusual sound
. Insulation resistance over 1M
. Adequately controls the air
temperature
. Adequately controls the refrigerant
temperature when the valve is switched
(Check temperature change when
cooling/heating is switched.)
. Clean, free of clogging or
damage
. No frayed or cut wires or
unplugged connectors
. Insulation resistance over 1M
What to do
Replace when insulation
resistance is under 1M
If the noise doesn't stop after
lubrication, change the oil.
Add lubr icant once a year.
Refer to the following page.
[5. Grease replenishing method]
Adjust the belt
Replace if the belt length
exceeds 2% of the original
length, worn, or used over 5000
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 e xtremely worm
Pour water into the drain trap
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 1M (under the
condition that the refrigerant
is not liquefied)
Tighten loosened bolts
Replace if insulation resistance
goes below 1M
Replace if malfunctioning
Replace if malfunctioning
Clean
Replace when cut or shorted,
when the insulation resistance
goes below 1M , or if there is a
history of abnormal operation
BS_08_C