Panasonic U-8ME2E8 Service Manual & Test Run Service Manual page 81

2. Discharging Compressor Oil
Low-pressure outlet port
(for ø7.94mm-dia connector)
Manifold gauge
Lo
Nitrogen gas
Liquid tube service port
(for ø7.94mm-dia connector)
Packless valve or the like
Oil balance tube service port
(For 7.94mm-dia. connector)
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. See the section "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
* 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.
Hi
Container
Condition of oil
Color
Light chestnut
Smells somewhat
Brownish
(not as strong as below)
Brownish /
Pungent / burnt odor
blackish
Type 18HP / 20HP
Fig. 2-d
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.
3 - 5
2WAY SYSTEM
Outdoor Unit Repair Procedures
High-pressure outlet port
(for ø7.94mm-dia connector)
Gas tube service port
(for ø7.94mm-dia connector)
Hue
3.5 or less
over 4.0
3