Panasonic U-8MF2E8 Service Manual page 64

2. Discharging Compressor Oil
2-2. Discharging Oil in Compressor
Recover the refrigerant in the outdoor unit following the procedures in "4. Recovering Refrigerant." Remove the
compressor and discharge the oil in it. Refer to "9. Compressor" for detailed procedures.
2-3. Checking the Oil
Acceptance/rejection criteria for the oil
Condition of
refrigeration cycle
Normal
Abnormal overheat-
operation
Motor burnout
2
* It is difficult to measure the total acid value in the field, therefore oil hue and odor are the rule of thumb.
Checking for carbon deposits and abrasive metal powder can additionally be used to assess the system condition.
Condition of oil
Color
Yellowish
Smells somewhat
Brownish
(not as strong as below)
Brownish /
Pungent / burnt odor
blackish
Judgment criteria for changing oil*
Odor Total acid value
None 0.02 or less
over 0.06
Changing the oil and system cleaning
with dry-cores are necessary.
Changing the oil and system cleaning
with dry-cores are necessary.
2 - 4
3WAY SYSTEM
Outdoor Unit Repair Procedures
Hue
3.5 or less
over 4.0