Service manual

Section 8 Refrigeration
8-5
MILD SYSTEM CONTAMINATION
CLEAN-UP 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.
IMPORTANT
Dry nitrogen is recommended for this procedure.
This will prevent CFC release.
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 250 microns. Run the vacuum
pump for ½ hour on self-contained models, 1
hour on remotes.
NOTE: You may perform a standing vacuum test to
make 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 Reach-In unit.
SEVERE SYSTEM CONTAMINATION
CLEAN-UP PROCEDURE
1. Remove the refrigerant charge.
2. Remove the compressor.
3. Remove the liquid line drier.
4. Replace the TXV.
5. Wipe away any burnout deposits from suction
and discharge lines at compressor.
6. Sweep through the open system with dry
nitrogen.
IMPORTANT
Refrigerant sweeps are not recommended, as they
release CFC’s into the atmosphere.
7. Install a new compressor and new start
components.
8. Install a suction line filter-drier (with acid and
moisture removal capability) of adequate size.
Place the filter drier as close to the compressor
as possible.
9. Install inlet and outlet access valves.
10. Install a new liquid line drier.
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