ICE MACHINES Q-Model Service Manual

Refrigeration System Section 7Self-Contained Charging ProceduresImportantThe charge is critical on all Manitowoc icemachines. Use a scale or a charging cylinder toensure the proper charge is installed.1. Be sure the toggle switch is in the OFF position.LOW SIDESERVICEVALVECLOSEDFRONTSEATEDCHARGINGCYLINDEROPENMANIFOLD SETOPENBACKSEATEDHIGH SIDESERVICEVALVECLOSEDFigure 7-15. Charging ConnectionsVACUUM PUMP/RECOVERY UNITSV1404B2. Close the vacuum pump valve, the low side servicevalve, and the low side manifold gauge valve.3. Open the high side manifold gauge valve, andbackseat the high side service valve.4. Open the charging cylinder and add the properrefrigerant charge (shown on nameplate) throughthe discharge service valve.5. Let the system “settle” for 2 to 3 minutes.6. Place the toggle switch in the ICE position.7. Close the high side on the manifold gauge set. Addany remaining vapor charge through the suctionservice valve (if necessary).NOTE: Manifold gauges must be removed properly toensure that no refrigerant contamination or loss occurs.8. Make sure that all of the vapor in the charging hosesis drawn into the ice machine before disconnectingthe charging hoses.A. Run the ice machine in freeze cycle.B. Close the high side service valve at the icemachine.C. Open the low side service valve at the icemachine.D. Open the high and low side valves on themanifold gauge set. Any refrigerant in the lineswill be pulled into the low side of the system.E. Allow the pressures to equalize while the icemachine is in the freeze cycle.F. Close the low side service valve at the icemachine.Remove the hoses from the ice machine and install thecaps.7-48 Part No. 80-1100-3