User manual SCOTSMAN NM1250

[. . . ] NM1250 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 informtion needed to install, start up, clean, maintain, and service this ice system. The NM1250 is a modular ice system that produces up to 1000 lbs. It features: front service for the evaporator, gearmotor, control box, water reservoir and bincontrol; stackability by use of kit KSTACK30; electronic circuitry for monitoring ice and water level; a thermostatic expansion valve; and R502 as the refrigerant. TABLE OF CONTENTS For the Installer Specifications . 6 For the Electrician Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] The ice machine senses water level by a probe located in the water reservoir. At least twice a year, the probe should be removed from the reservoir, and the tip wiped clean of mineral buildup. The bearing in the breaker should also be checked at least two times per year. Check the bearing by: · removing the ice chute cover · unscrewing the ice sweep · removing the water shed · using a spanner wrench and unscrewing the breaker cover · unscrewing the auger stud SPANNER WRENCH BREAKER COVER BREAKER February, 1989 Page 17 NM1250 MAINTENANCE: Auger ///////////////////////////WARNING//////////////////////////// Disconnect electrical power before begining. Handle auger with care, it has sharp edges. ///////////////////////////////////////////////////////////////////////// In some installations the water supply to the icemaker will be so concentrated with dissolved minerals, (such as calcium carbonate) that as ice is made, the evaporator and auger become coated with the minerals, requiring a more frequent cleaning 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 of these parts, see REMOVAL AND REPLACEMENT. To remove the auger, remove front and top panel. If top panel cannot be removed, or if there is less than 6" clearance over the top of the machine, the gearmotor/evaporator may be slid out for service access. Remove 3 hex studs holding ice chute cover to ice chute, and remove cover. Unscrew and remove ice sweep. ALLEN HEAD SCREWS BREAKER & BEARING & AUGER ASSEMBLY 4. Loosen band clamp under ice chute, and remove ice chute from evaporator. Remove 4 allen head screws holding breaker to evaporator. Allow the auger to dry, the stainless steel of the auger and evaporator must be clean and bright. Clean the auger and evaporator as required. Reverse to reassemble. February, 1989 Page 18 NM1250 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. [. . . ] If there were no shims on the new parts, do not use any shims. Bench test the gearmotor, check for oil leaks, noise, and amp draw. February, 1989 Page 28 NM1250 REMOVAL AND REPLACEMENT: Gearmotor WATER SHED SEAL CENTRIFUGAL SWITCH DRIVE MOTOR GEARCASE COVER, BEARINGS, OUTPUT GEAR, OUTPUT SHAFT BEARING 2ND GEAR AND BEARINGS 1ST GEAR AND BEARINGS SEAL GASKET GEARCASE February, 1989 Page 29 NM1250 CIRCUIT BOARD TESTING ///////////////////////////////////////////////////////////////////////WARNING////////////////////////////////////////////////////////////////// These procedures require the machine to be connected to the power supply. The voltages of the electronic circuit are very low, but HIGHER VOLTAGES ARE PRESENT IN THE UNIT. Do not touch anything but the tester while the unit is being checked out. [. . . ]