User manual SCOTSMAN FME800

[. . . ] NME650 & FME800 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 is a modular ice system that fits a variety of Scotsman ice 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 FOR THE INSTALLER . 26 REMOVAL AND REPLACEMENT: Water Seal REMOVAL AND REPLACEMENT: Evaporator . [. . . ] Step 1: Remove the top panel. February 1997 Page 18 NME650 & FME800 MAINTENANCE AND CLEANING: Auger After the auger has been removed, allow the auger to dry: if the auger is not bright and shiny, it must be cleaned. Disconnect electrical power before beginning. FME Components In some areas, the water supply to the ice maker Shown, NME similar. will contain a high concentration of minerals, 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. For more information on removal of these parts, see REMOVAL AND REPLACEMENT. Bail Clamp ALLEN SCREWS BREAKER & BEARING & AUGER ASSEMBLY Chute Cover NME Components Shown, FME similar. Assembled Chute and Evaporator Breaker Cover 3. Pull up to remove auger. February 1997 Page 19 NME650 & FME800 SERVICE DIAGNOSIS: Condition - No Ice Being Produced STATUS: NOTHING OPERATES A. Check: The reset switches, ( high and low pressure): depress and release each switch. Check the low pressure cut out, if closed, go to E; if 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 32-34 psig) stop and look for a leak, 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. Check the high pressure cut out, if closed go to F; if open check: 1. Check the high side pressure, reset the control, and observe: on water cooled, that water soon begins to flow from the condenser drain; or, on air cooled, that the fan is forcing air through the condenser. If the unit trips out on pressures below 450 psig, replace the control. If the pressures rise above the trip out point, and the unit shuts down: a. Check for adequate water flow on water cooled, if adequate, clean the interior of the condenser. If the pressures are still too high replace the water regulating valve. 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. [. . . ] ·Refrain from checking refrigeration Access Valves: To use the access valves: pressures without reason. Visual inspection Remove the cap from the stem, use a 3/16" allen of the water system, observation of the ice wrench to check that the valve is CLOSED. Close the valve and replace the caps when the Scotsman also recommends that, at the time of job is finished. ·If gauges must be used, don't always check the high side pressure. [. . . ]