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2
Mini VRF SYSTEM
Outdoor Unit Repair Procedures
Condition of
refrigeration cycle
Recover the refrigerant in the outdoor unit following the procedures in “3. Recovering Refrigerant.” Remove the
compressor and discharge the oil in it. Refer to “7. Compressor” for detailed procedures.
2-1. Checking the Oil
Acceptance/rejection criteria for the oil
* 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
OdorColor
Judgment criteria for changing oil*
HueTotal acid value
0.02 or less 3.5 or less
4.0 or over0.06 or over
Smells some what
(not as strong as below)
Pungent / burnt odor
Brownish
Brownish /
blackish
Motor burnout
Abnormal overheat-
operation
Normal
Changing the oil and system cleaning
with dry-cores are necessary.
Changing the oil and system cleaning
with dry-cores are necessary.
Yellowish None
2. Discharging Oil in Compressor
SM830195-04_Mini VRF SYS.indb 4 15/01/08 18:35:45
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