Manitowoc

SEVERE SYSTEM CONTAMINATION CLEANUPPROCEDURE1. Remove the refrigerant charge.2. Remove the compressor.3. Disassemble the hot gas solenoid valve. If burnoutdeposits are found inside the valve, install a rebuild kit,and replace the TXV and head pressure control valve.4. Wipe away any burnout deposits from suction anddischarge lines at compressor.5. Sweep through the open system with dry nitrogen.ImportantRefrigerant swee ps are not re commended, asthey release CFCs into the atmosphere. Dry nitrogen is re commended for this procedure.This will prevent CFC release.6. Install a new compressor and new start components.7. Install suction line filter-drier in front of compressor.8. Install a new liquid line drier.9. Follow the normal evacuation procedure, except replacethe evacuation step with the following:A. Pull vacuum to 1000 microns. Break the vacuumwith 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 vacuumwith dry nitrogen and sweep the system.Pressurize to a minimum of 5 psig.D. Change the vacuum pump oil.E. Pull vacuum to 500 microns. Run the vacuumpump for 1 additional hour.10. Charge the system with the proper refrigerant to thenameplate charge.11. Operate the ice machine for one hour. Then, check thepressure drop across the suction line filter-drier.A. If the pressure drop is less than 2 psig, the filterdriershould be adequate for complete cleanup.B. If the pressure drop exceeds 2 psig, change thesuction line filter-drier and the liquid line drier.Repeat until the pressure drop is acceptable.12. Operate the ice machine for 48 – 72 hours. Replace thesuction line and liquid line drier if necessary.13. Follow normal evacuation procedures.Part Number 80-01111-9 7/10 193