Operating instructions

TM 11574A-OI
3-17
(d) Compressor cleanup after mild burnout.
WARNING
Observe all safety precautions while working on system. Avoid contact with refrigerant/oil
mixture since acid burns may result. Wear safety glasses and work gloves.
NOTE
There are two types of burnout cleanup covered in the following section; Mild Burnout
and Severe Burnout. Mild burnout is a non-running motor burn with the motor
contaminants confined to the compressor. Severe burnout is a running motor burn where
the contaminants are pumped through the system. This type of failure accounts for 3 to
5% of all motor burnouts.
1
Shut off power, then remove refrigerant charge from compressor using suitable
refrigerant recovery device. Do not blow charge to the atmosphere.
2
Remove compressor leaving service valves.
3
Replace compressor.
4
Replace liquid line filter with one size larger in capacity than the unit being worked
on.
5
Triple evacuate down to 29 inches of mercury, breaking twice with refrigerant. Pull a
deep vacuum of 500 microns before recharging.
6
Recharge unit compensating for larger liquid line filter.
7
Run a minimum of one hour and replace liquid line filter.
8
Acid check oil. If acid is present, change oil.
(e) Compressor cleanup after severe burnout.
WARNING
Observe all safety precautions while working on system. Avoid contact with refrigerant/oil
mixture since acid burns may result. Wear safety glasses and work gloves.
NOTE
There are two types of burnout cleanup covered in the following section; Mild Burnout
and Severe Burnout. Mild burnout is a non-running motor burn with the motor
contaminants confined to the compressor. Severe burnout is a running motor burn where
the contaminants are pumped through the system. This type of failure accounts for 3 to
5% of all motor burnouts.
1
Shut off power, then remove refrigerant charge from compressor using suitable
refrigerant recovery device. Do not blow charge to the atmosphere.
2
Remove compressor leaving service valves.
3
Replace compressor.