Manitowoc FLAKE/CHIPLET QC0700 Service Manual

Also see for QC0700: Installation, use & care manual Building instructions Service manual Technician's handbook

Contents

Manitowoc FLAKE/CHIPLET QC0700 Service Manual Manual pdf 142 page image

Refrigeration System Section 77-20 Part No. 80-1214-3Mild System Contamination Cleanup Procedure1. 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 heatlamps during evacuation. Position them at thecompressor, condenser and evaporator prior toevacuation. Do not position heat lamps too close toplastic components, or they may melt or warp.4. Follow the normal evacuation procedure, exceptreplace the 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 psi.B. Pull vacuum to 500 microns. Break the vacuumwith 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 vacuumpump for 1/2 hour on self-contained models, 1hour on remotes.NOTE: You may perform a pressure test as a preliminaryleak check. You should use an electronic leak detectorafter system charging to be sure there is no leak.5. Charge the system with the proper refrigerant to thenameplate charge.6. Operate the ice machine.Severe System Contamination Cleanup Procedure1. Remove the refrigerant charge.2. Remove the compressor.3. If burnout deposits are found inside the suction ordischarge lines at the compressor.4. Wipe away any burnout deposits from suction anddischarge lines at compressor.5. Sweep through the open system with dry nitrogen.6. Install a new compressor and new startcomponents.7. Install a suction line filter-drier in front ofcompressor. (Remote Models replace suction filterwith an acid removal suction filter/drier). Installaccess valves to allow pressure drop readings to betaken across the suction filter, when needed.8. Install a new liquid line drier.Continued on next page …ImportantDry nitrogen is recommended for this procedure.This will prevent CFC release.ImportantRefrigerant sweeps are not recommended, as theyrelease CFC’s into the atmosphere.Revised 8/2003