3 - 5
2WAY SYSTEM
Outdoor Unit Repair Procedures
3
2. Discharging Compressor Oil
Nitrogen gas
Manifold gauge
Lo Hi
Packless valve or the like Container
Oil balance tube service port
(For 7.94mm-dia. connector)
Low-pressure outlet port
(for ø7.94mm-dia connector)
Liquid tube service port
(for ø7.94mm-dia connector)
High-pressure outlet port
(for ø7.94mm-dia connector)
Gas tube service port
(for ø7.94mm-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
Condition of oil Judgment criteria for changing oil*
Color Odor Total acid value Hue
Normal Light chestnut None 0.02 or less 3.5 or less
Abnormal overheat-
operation
Brownish
Smells somewhat
(not as strong as below)
over 0.06 over 4.0
Changing the oil and system cleaning
with dry-cores are necessary.
Motor burnout
Brownish /
blackish
Pungent / burnt odor
Changing the oil and system cleaning
with dry-cores are necessary.
* 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.
Fig. 2-d
Type 18HP / 20HP
SM830253-00_欧州2way7_SM-TRSM.indb 5 16/08/26 19:25:02
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