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ARMY TM 9-4210-381-14
NAVY EE-000-CA-MMA-010/7053-AC
AIR FORCE TO 35E9-136-31
BURN OUT PROCEDURE
WARNING
Avoid skin contact or inhaling fumes from any acid formed by burnout of oil and refrigerant. Wear a
gas mask if area is not thoroughly ventilated. Wear protective goggles or glasses to protect eyes.
Wear rubber gloves to protect hands.
1.
After removal of a bad compressor from the refrigerant system, drain a sample of oil into a clear glass container.
2.
If the oil is clean and clear, and does not have a burnt acid smell, the compressor did not fail because of motor
burn out. If burnout is no, indicated, proceed to INSTALLATION of compressor.
3.
If the oil is black, contains sludge, and has burnt acid odor, the compressor failed because of motor burn out.
4.
You must clean the entire refrigeration system after burn out has occurred, since contaminants will have been
carried to many corners and restrictions in the piping and fittings. These contaminants will soon mix with new
refrigerant gas and compressor oil to cause repeated burn outs.
5.
Install new drier filter (para 5-26) and clean refrigerant strainer cartridge (para 5-27).
6.
Install replacement compressor (see INSTALLATION).
7.
Frontseat (clockwise) compressor discharge valve (para 5-33) and suction valve (para 5-34).
8.
Open manual valve (para 5-39) to bypass pressure regulator.
9.
Tag and disconnect solenoid L1 and L2 coil wires (para 4-88).
WARNING
External input power is used for this procedure. Voltages used can be deadly.
10.
Connect an external 120 V ac power source to L1 and L2 and apply power to coils to open solenoid valves.
11.
Purge refrigerant system (para 5-13) for at least 30 seconds at 50 psig (3.5 kg/cm2) pressure.
12.
Clean system by back flushing with liquid refrigerant, R-1 1, from pressurized cylinder or circulating pump and
reservoir with pressure of at least 100 psig (7 kg/cm2).
13.
If pump is used, connect the discharge line of the refrigerant system to the discharge side of the pump.
14.
Connect a line containing a filter to the suction line in the unit.
NOTE
An unused dehydrator or other suitable medium may be used as a filter.
15.
The other end of the temporary suction line should be connected to a small drum or suitable reservoir.
16.
A line should be run from the bottom of the reservoir to the inlet of the pump.
WARNING
Avoid skin contact or inhaling fumes from any acid formed by burnout of oil and refrigerant. Wear a
gas mask if area is not thoroughly ventilated. Wear protective goggles or glasses to protect eyes.
Wear rubber gloves to protect hands.
17.
Fill reservoir with fluorocarbon refrigerant, R-11, and start the pump. Continue filling the reservoir with
refrigerant, R-11, until it begins to pour out of the return line. Continue flushing for a least 15 minutes.
18.
Remove the pump, reservoir and filter. Purge refrigerant system (para 5-13). Blow dry nitrogen through the
system at 50 psig (3.5 kg/cm2) for at least 30 seconds.
5-107
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