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Refrigeration System Section 7
7-20
Part No. 80-1214-3
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 psi.
B. Pull vacuum to 500 microns. Break the vacuum
with dry nitrogen and sweep the system.
Pressurize to a minimum of 5 psi.
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 is no leak.
5. Charge the system with the proper refrigerant to the
nameplate charge.
6. Operate the ice machine.
Severe System Contamination Cleanup Procedure
1. Remove the refrigerant charge.
2. Remove the compressor.
3. If burnout deposits are found inside the suction or
discharge lines at the compressor.
4. Wipe away any burnout deposits from suction and
discharge lines at compressor.
5. Sweep through the open system with dry nitrogen.
6. Install a new compressor and new start
components.
7. Install a suction line filter-drier in front of
compressor. (Remote Models replace suction filter
with an acid removal suction filter/drier). Install
access valves to allow pressure drop readings to be
taken across the suction filter, when needed.
8. Install a new liquid line drier.
Continued on next page …
Important
Dry nitrogen is recommended for this procedure.
This will prevent CFC release.
Important
Refrigerant sweeps are not recommended, as they
release CFC’s into the atmosphere.
Revised 8/2003