Mild System Contamination Cleanup Procedure - Manitowoc MD0420A Technician's Handbook

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.
4. 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 5 psig.
B. Pull vacuum to 500 microns. Break the
vacuum with dry nitrogen and sweep the
system. Pressurize to a minimum of 5 psig.
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: You may perform a pressure test as a
preliminary leak check. You should use an electronic
leak detector after system charging to be sure there
are no leaks.
5. Charge the system with the proper refrigerant to
the nameplate charge.
6. Operate the ice machine.
112 Part Number 040005626 5/17