User manual SCOTSMAN NME1850

[. . . ] NME1850 & FME2400 INTRODUCTION To the owner or user: The service manual you are reading is intended to provide you, and the maintenance or service technician, with the information needed to install, start up, clean, maintain, and service this ice system. This product contains 2 separate ice making systems in one cabinet. TABLE OF CONTENTS Installation For the Installer Specifications . 5 For the Plumber Final Check List Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Maintenance and Cleaning Removal and Replacement Service Diagnosis . [. . . ] Do NOT use a wire brush. FAN MOTOR ASSEMBLY Disconnect electrical power before beginning. A. Pull fan motor assembly off of locating pins and out of the unit. B. Remove two screws, and unplug the fan motors. CAP SCREW LOCATING PINS UNPLUG LEADS D. Clean the condenser; reassemble by placing the fan motor assembly onto the locating pins, replacing the mounting screws, plugging the fan motors back in, and replacing the top panel. Reconnect power. January 1994 Page 18 NME1850 & FME2400 MAINTENANCE AND CLEANING: Auger In some areas the water supply to the ice maker will have a great deal of minerals in it, and that will result in an evaporator and auger becoming coated with these minerals, requiring a more frequent removal than twice per year. If in doubt about the condition of the evaporator and auger, the auger can be removed so the parts can be /////////////WARNING/////////////// inspected. The auger has sharp Note: Water filters can filter out suspended solids, edges, handle with care. ``Soft'' water may not be //////////////////////////////////////////// the complete answer. For more information on removal of these parts, see REMOVAL AND REPLACEMENT. ALLEN SCREWS BREAKER & BEARING & AUGER ASSEMBLY Disconnect electrical power before beginning. 1. Push back bail clamp holding ice chute cover to ice chute, and remove cover. Loosen band clamp under ice chute, and remove ice chute from evaporator. 5. Drain the evaporator by pulling down and uncapping the evaporator drain tube. After the auger has been removed, allow the auger to dry: if the auger is not bright and shiny, it must be cleaned. Reverse to reassemble. January 1994 Page 19 NME1850 & FME2400 SERVICE DIAGNOSIS: Condition - No Ice Being Produced STATUS: NOTHING OPERATES A. Check: The 2 reset switches , (high and low pressure): depress and release each switch. If the still does not start, check: the spout switch; the high and the low side pressures. Check the low pressure cut out, if closed, go to E; if it is open, it could be due to: ·Low refrigerant charge ·The auger not turning ·Restricted system ·TXV not opening 1. Check the low side pressure, the low pressure cut out opens at pressure below 4 psig. Check if the auger is turning, if it is not, remove the gearbox and: Check for internal damage, repair and replace in the machine. Check for low charge, add some refrigerant, if the unit will operate, (normal low side pressure being about 32 psig) stop and look for a leak, recover, repair, replace the drier, evacuate, and weigh in the nameplate charge. If, with added charge, the unit does not operate: Check for a restricted system, replace the drier, evacuate, and weigh in a nameplate charge. Check for a Thermostatic Expansion Valve that does not open, if defective, replace it. [. . . ] To reassemble: Place the fan motor assembly lower flange holes over the two allen head cap screws in the base, and reinstall the hex head bolts at the top of the assembly. Plug the fan motors back in, and replace the top panel. January 1994 Page 30 NME1850 & FME2400 Removal and Replacement: Refrigeration System This ice machine uses R-404A refrigerant and polyolester oil. ·R-404A is a "Near Azeotrope" so liquid charging is required: included with replacement compressors. Pressure-Temperature Chart for HP62 ·When the system is serviced, a special liquid line drier is required. It is ·HP62 is not compatible with mineral oil, so these ice machines use Polyolester oil. [. . . ]