Midea PD Series Manual page 33

copper tubing. (Do not use regular hoses.)
10. Evacuate system to maximum absolute holding pressure of 200 microns or less. NOTE:
This process can be speeded up by use of heat lamps, or by breaking the vacuum with
refrigerant or dry nitrogen at 5,000 microns. Pressure system to 5 PSIG and leave in system
a minimum of 10 minutes. Recover refrigerant, and proceed with evacuation of a pressure of
200 microns or a minimum of 10%.
11. Break vacuum by charging system from the high side with the correct amount of refrigerant specified.
This will prevent boiling the oil out of the crankcase.
NOTE: If the entire charge will not enter the high side, allow the remainder to enter the low
side in small increments while operating the unit.
12. Restart unit several times after allowing pressures to stabilize. Pinch off process tubes, cut and solder
the ends. Remove pinch off tool, and leak check the process tube ends
9.2.4 Special procedure in the case of compressor motor burnout
1. Recover all refrigerant and oil from the system.
2. Remove compressor, capillary tube and filter drier from the system.
3. Flush evaporator condenser and all connecting tubing with dry nitrogen or equivalent, to
remove all contamination from system. Inspect suction and discharge line for carbon deposits.
Remove and clean if necessary.
4. Reassemble the system, including new drier strainer and capillary tube.
5. Proceed with processing as outlined under hermetic component replacement.
9.2.5 Rotary compressor special troubleshooting and service
Basically, troubleshooting and servicing rotary compressors is the same as on the reciprocating
compressor with only a few exceptions.
1. Because of the spinning motion of the rotary, the mounts are critical. If vibration is present,
check the mounts carefully.
2. The electrical terminals on the rotary are in a different order than the reciprocating
compressors. The terminal markings are on the cover gasket. Use your wiring diagram to
insure correct connections.
9.2.6 Refrigerant charge
1. The refrigerant charge is extremely critical. It must be measured charge carefully - as exact
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