User manual SCOTSMAN NM952R

[. . . ] NM952R 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 NM952R 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 R-22 as the refrigerant. TABLE OF CONTENTS For the Installer Specifications . 8 For the Electrician . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Final Check List . [. . . ] Use a vacuum cleaner or coil cleaner if needed. Check and tighten all bolts and screws. ////////////////////////////////////// CAUTION: THE TIP IS MADE OF GLASS /////////////////////////////////////// ICE SWEEP 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 BREAKER COVER November 1992 Page 23 NM952R MAINTENANCE AND CLEANING 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 inspected. Note: Water filters can filter out suspended solids, but not dissolved solids. "Soft" water may not be the complete answer. Check with a water treatment specialist regarding water treatment For more information on removal and replacement of these parts, see REMOVAL AND REPLACEMENT. 1. To remove the auger, remove the front and top panels. Remove 3 hex studs holding ice chute cover to ice chute, and remove cover. Loosen band clamp under ice chute, and remove ice chute from evaporator. Remove 4 allen screws holding breaker to evaporator. After the auger has been removed, allow the auger to dry; if the auger is not bright and shiny, it must be cleaned. Clean the auger and evaporator as required. Reverse to reassemble. ALLEN SCREWS BREAKER & BEARING & AUGER ASSEMBLY November 1992 Page 24 NM952R SERVICE DIAGNOSIS: Condition - No Ice Being Produced STATUS: NOTHING OPERATES A. Check: Voltage to the unit, restore it if there is none. Check: The master switch, switch ON if off. Check: The 2 reset switches (spout switch and high pressure): depress and release each switch. If the unit still does not start, check the spout for too much ice, or high side pressure. Check the high pressure cut out switch. 1. Check the high side pressure, reset the switch and observe that the fan is forcing air through the condenser. If the switch opens at pressures below 400 psig, replace the switch. [. . . ] Bench test the gearmotor, check for oil leaks, noise, and amp draw. Charging Procedures Extra care must be taken when recharging this remote system. No liquid refrigerant may be placed in the system at the compressor. DO NOT use the access valves at the front of the unit for weighing in the charge. All liquid refrigerant must be weighed into the receiver through the "front seated" king valve". FRONT SEATED KING VALVE RECEIVER SERVICE PORT CHARGING CYLINDER November 1992 Page 35 NM952R CIRCUIT BOARD TESTING INSTRUCTIONS FOR USING TESTER MODEL FC1 (Optional, order part no. [. . . ]