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3. Discharging Compressor Oil
Discharged oil can be used for checking the condition of the system. Based on the appearance and color of the
discharged oil, a judgment can be made on whether the system is operating normally or not.
3-1. Discharging Oil from Oil Separator
Recover the refrigerant from the outdoor unit following the procedure given in "5. Recovering Refrigerant." Install
hoses as indicated on the equipment and feed nitrogen gas gradually to provide pressure to the system from the
low-pressure outlet and collect oil in a pan or container. (Fig. 6)
• The low-pressure outlet port is at the Lo side of the right side.
CAUTION
• A faulty outdoor unit may remain pressurized. The oil delivery port employs a
Packless valve or the like
Nitrogen gas
3-2. Discharging Oil in Compressor
Recover the refrigerant in the outdoor unit following the procedures in "5. Recovering Refrigerant." Remove the
compressor and discharge the oil in it. Refer to "10. Compressor" for detailed procedures.
3-3. Checking the Oil
Acceptance/rejection criteria for the oil
Condition of
refrigeration cycle
Normal
Abnormal
Brownish
overheat operation
Brownish /
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.
Schrader-type push-to-release valve. Be careful to avoid accidental oil release
when using the port.
Container
Manifold gauge
Lo
Hi
Condition of oil
Color
Odor
Yellowish
None
Smells somewhat
(not as strong as below)
Pungent / burnt odor
blackish
Oil delivery port
(For 1/4" (6.35mm)-dia.
connector)
Fig. 6
Judgment criteria for changing oil*
Total acid value
0.02 or less
0.06 or over
Changing the oil and system cleaning
with dry-cores are necessary.
Changing the oil and system cleaning
with dry-cores are necessary.
2 - 5
3-WAY ECO-i SYSTEM
Outdoor Unit Repair Procedures
Low-pressure outlet port
(For 5/16" (7.94mm)-dia.
connector)
Hue
3.5 or less
4.0 or over
2
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