Manitowoc EC18, Technician'S Handbook

Page: 95 / 184

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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.