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–76–

MILD SYSTEM CONTAMINATION CLEANUP

Procedure

1. Replace any failed components.

2. If the compressor is good, change the oil.

3. Replace the liquid line drier.

NOTE: If the contamination is from moisture, use heat

lamps during evacuation. Position them at the

compressor, condenser and evaporator prior to

evacuation. Do not position heat lamps too close to

plastic components, or they may melt or warp.

Follow the normal evacuation procedure, except

replace the evacuation step with the following:

A. Pull vacuum to 1000 microns. Break the vacuum

with dry nitrogen and sweep the system. Pressurize

to a minimum of .35 bar.

B. Pull vacuum to 500 microns. Break the vacuum

with dry nitrogen and sweep the system. Pressurize

to a minimum of .35 bar.

C. Change the vacuum pump oil.

D. Pull vacuum to 500 microns. Run the vacuum pump

for 1/2 hour on self-contained models, 1 hour on

remotes.

NOTE: Perform a pressure test to be sure there are no

leaks.

Charge the system with the proper refrigerant to the

nameplate charge.

Operate the ice machine.

Important

Dry nitrogen is recommended for this procedure.

This will prevent CFC release.

Manitowoc UG040A Technician's Handbook

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