User manual SCOTSMAN NME650R

[. . . ] NME650R 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. The NME650R is a remote condenser modular ice system that fits a variety of Scotsman storage bins. It features: front service for the freezer, gearmotor, control box, water reservoir, and bin control; an electronic circuit for monitoring ice and water level; a thermostatic expansion valve; and HP62 as the refrigerant. Table of Contents INTRODUCTION . 36 Parts Lists and Wiring Diagrams are located in the center of this manual, printed on yellow paper. This manual was printed on recycled paper. [. . . ] At least twice a year, the probe should be removed from the reservoir, and the tip wiped clean of mineral build-up. SLIDE UP TO REMOVE ICE LEVEL SENSORS SLIDE LEFT TO REMOVE Inspect the assembly, looking for wear 4. Check and tighten all bolts and screws. ICE SWEEP WATER LEVEL SENSOR ////////////////////////////////////// CAUTION: THE TIP IS MADE OF GLASS /////////////////////////////////////// BREAKER COVER 3. The top bearing in the breaker should also be checked at least two times per year. Check the breaker bearing by: · removing the ice chute cover · unscrewing the ice sweep · removing the water shed · unscrewing the breaker cover (left hand thread) · unscrewing the auger stud August 1993 Page 21 NME650R MAINTENANCE AND CLEANING In some areas the water supply to the icemaker 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 inspected. Note: Water filters can filter out suspended solids, but not dissolved solids. Check with a water treatment specialist regarding water treatment For more information on removal and replacement of these parts, see REMOVAL AND REPLACEMENT. Move bail clamp holding ice chute cover to ice chute, and remove cover. Bail Clamp 3. 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. ALLEN SCREWS BREAKER & BEARING & AUGER ASSEMBLY June 1994 Page 22 NME650R OPERATING CHARACTERISTICS Typical Low Side Pressure · 28 - 32 PSIG Typical Discharge Side Pressure · 240 PSIG, will vary bewteen 180 and 380 depending upon air and water temperatures · 208 ounces of R-404A ·8-9 · 3. 5 Refrigerant Charge Typical Compressor Amp Draw Typical Gearmotor Amp Draw to 3. 8 High Pressure Cut Out · 450 PSIG Pump Down Pressure Switch - after May 1995 production · Opens at 15 PSIG (was 2 PSIG) · Closes at 30 PSIG (was 17 PSIG) · RS58CiE-PAA-213 · Electric Eye at base of ice chute. · Thermistor in reservoir Compressor Bin Control Water Safety June 1995 Page 23 NME650R SERVICE DIAGNOSIS: Condition - No Ice Being Produced STATUS: NOTHING OPERATES A. Check: The reset switch (high pressure): depress and release the switch. Check the high side pressure, reset the switch and observe that the fan is forcing air through the condenser. If the pressures rise above the trip out point, and the unit shuts down: a. If the air flow is poor because of the installation, advise the user that the unit should be moved, or the air around it kept cooler. Check that the fan blades are clean, and the fan secure to the fan motor shaft. Check the head pressure control valve, it should be maintaining a head pressure above 180 psig. If the unit has the correct charge, and the condenser is clean, and the refrigerant lines are not kinked or twisted, and the condenser is not overheated by external heat loads, the head pressure should be under the trip out point of the head pressure control switch. If all of the above are found to be good, and the machine trips out on high head pressure, replace the head pressure control valve. E. If there is not enough water in the reservoir, the water level sensor will keep the machine from starting. a. If the machine does not start, see the next page. June 1994 Page 24 NME650R SERVICE DIAGNOSIS: Condition - No Ice Being Produced STATUS: NOTHING OPERATES F. Check: The gear motor, if it will not run, the compressor will not run. [. . . ] recharged with the correct amount of refrigerant as listed on the nameplate of the ice machine, or performance will suffer. Access Valves · Anytime the refrigeration system has been Note: There are no valve opened, the dryer should be replaced. Charging Procedures Extra care must be taken when recharging this remote system. DO NOT use the valves at the front of the unit for weighing in the charge. [. . . ]