226 Part Number 80-1505-3 6/11
Severe System Contamination
1. Remove the refrigerant charge.
2. Remove the compressor.
3. Cut copper tubing at the outlet of the harvest
valve. If burnout deposits are found inside the
tubing, replace the harvest valve, TXV and head
pressure control valve.
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. Replace existing suction line filter.
8. Install a suction line filter-drier.
9. Install a new liquid line drier.
10. 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. Change the vacuum pump oil.
C. Pull vacuum to 500 microns. Break the
vacuum with dry nitrogen and sweep the
system. Pressurize to a minimum of 5 psig.
D. Change the vacuum pump oil.
E. Pull vacuum to 250 microns. Run the vacuum
pump for 1 hour additional.
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