Compressor Replacement Procedure; Inspect Oil From Faulty Compressor; Check Oil In Other Compressors In The System; Replace Oil Separator(S) And Accumulator(S) - Midea V6-i Series Service Manual

V6-i VRF 50/60Hz
2.13.12

Compressor replacement procedure

Step 1: Remove faulty compressor and remove oil
 Remove the faulty compressor from the outdoor unit.
 Before removing the oil, shake the compressor so as to not allow
impurities to remain settled at the bottom.
 Drain the oil out of the compressor and retain it for inspection.
Normally the oil can be drained out from the compressor discharge
pipe.
Step 2: Inspect oil from faulty compressor
 The oil should be clear and transparent. Slightly yellow oil is not an indication of any problems. However, if the oil is
dark, black or contains impurities, the system has problems and the oil needs to be changed. Refer to Figure 5-4.16
for further details regarding inspecting compressor oil. (If the compressor oil has been spoiled, the compressor will
not be being lubricated effectively. The scroll plate, crankshaft and bearings will wear. Abrasion will lead to a larger
load and higher current. More electric energy will get dissipated as heat and the temperature of the motor will
become increasingly high. Finally, compressor damage or burnout will result.)
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 only lightly spoiled, go to Step 4.
 If the oil drained from the faulty compressor is heavily spoiled, check the oil in the other compressors in the system.
Drain the oil from any compressors where the oil has been spoiled. Go to Step 4.
Step 4: Replace oil separator(s) and accumulator(s)
 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 compressors
in Step 3, use clean oil to clean them before re-fitting them into the units. 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 1.2L of oil to the new compressor through the discharge pipe, using a
funnel.
 Add 1.2L of oil to each of the compressors from which oil was drained in Step 3.
 Only use FV68H oil. Different compressors require different types of oil. Using the wrong type of oil leads to various
problems.
 Add additional oil to the accumulators such that the total amount of oil is 5L in 8-12HP units, 6L in 14-16HP units 7L in
18-22HP units, 9L in 24-28HP units and 10L in 30-32HP units.
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Figure 6-2.8: Draining oil from a compressor
Figure 6-2.9: Compressor piping
Discharge pipe
Inner oil
balance
pipe