Midea Mini C Series Service Manual page 83

Mini C Series VRF 50/60Hz
Step 3: Check oil in other compressors in the system
 If the oil drained from the faulty compressor is clean, go to Step 6.
 If the oil drained from the faulty compressor is spoiled (lightly or heavily), go to Step 4.
Step 4: Replace oil separator and accumulator
 If the oil from a compressor is spoiled (lightly or heavily), drain the oil from the oil separator and accumulator in that
unit and then replace them.
Step 5: Check filters(s)
 If the oil from a compressor is spoiled (lightly or heavily), check the filter between the gas stop valve and the 4-way
valve in that unit. If it is blocked, clean with nitrogen or replace.
Step 6: Replace the faulty compressor and re-fit the other compressors
 Replace the faulty compressor.
 If the oil had been spoiled and was drained from the non-faulty compressor
in Step 3, use clean oil to clean them before re-fitting it into the unit. To clean,
add oil into the compressor through the discharge pipe using a funnel, shake
the compressor, and then drain the oil. Repeat several times and then re-fit
the compressors into the units. (The discharge pipe is connected to the oil
pool of the compressor by the inner oil balance pipe.)
Step 7: Add compressor oil
 Add oil to each of the compressors from which oil was drained in Step 3.
 Only use RB75EA oil. Different compressors require different types of oil.
Using the wrong type of oil leads to various problems.
 Add oil to the accumulator from which oil was drained in Step 4.
Step 8: Vacuum drying and refrigerant charging
 Once all the compressors and other components have been fully connected, vacuum dry the system and recharge
refrigerant.
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Figure 6-2.6: Compressor piping
Discharge pipe
Suction pipe