REPAIR OR REPLACEMENT - continued - TM-9-4120-423-14-P0436

TM9-4120-423-14&P

You must clean the entire refrigeration system after a burnout 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 R-22 gas and compressor oil to cause repeated

burnouts.

Remove the filter-drier, and blow down each leg of the refrigeration system. To do this, connect

a cylinder of dry-nitrogen to each filter-drier connection, in turn, and open the cylinder shutoff

valve for at least 30 seconds at 50 psig (3.5 kg/square centimeter) pressure.

Connect the two filter-drier fittings with a jumper, locally manufactured from refrigerant tubing

and fittings.

Clean system by back flushing with liquid R-11 from pressurized cylinder or circulating pump

and reservoir with pressure of at least 100 psig.

If pump is used, connect the discharge line of the Refrigerant R-22 system to the discharge side

of pump.

Connect a line containing a filter to the suction line in the unit.

NOTE

An unused filter-drier or other suitable medium may be used as the filter.

The other end of the temporary suction line should be connected to a small drum or suitable

reservoir.

A line should be run from the bottom of the reservoir to the inlet of the pump.

WARNING

If compressor burnout is suspected, use care when handling compressor to avoid touching

compressor sludge. Acid in sludge can cause burns. Avoid inhaling fumes and burns

from any acid formed by burnout of oil and Refrigerant R-22. Wear gas mask if area is

not thoroughly ventilated. Wear protective goggles or glasses to protect eyes. Wear

rubber gloves to protect hands. Use care to avoid spilling compressor burnout sludge. If

sludge is spilled, clean area thoroughly.

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 at least 15 minutes.

Reverse the pump connections, replace the filter with a new filtering medium, and back flush the

system for an additional 15 minutes.

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