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NME454, 654 & FME504, 804
INTRODUCTION
To the owner or user: The service manual you are Its features include: front service for the freezer,
reading is intended to provide you, and the gearmotor, control box, water reservoir, and bin
maintenance or service technician, with the control; an electronic control (AutoSentry) for
information needed to install, start up, clean, monitoring ice level, water level and drive motor
maintain, and service this ice system. current; a thermostatic expansion va
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NME454, 654 & FME504, 804 FOR THE INSTALLER These machines fit the following Scotsman Installation Limitations: products, check sales literature for other possible This ice system is designed to be installed indoors, combinations: in a controlled environment: SB480 and extensions (with bin top KBT18) Min. Max. 0 0 B530 using bin top KBT14 or KBT20 Air Temperature 50 F 100 F 0 0 Water Temperature 40 F 100 F B842 using bin top KBT28 Water Pressure 20 PSI 80 PSI B948 using bin top KBT24 Voltage
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NME454, 654 & FME504, 804 SAMPLE BIN AND MACHINE COMBINATIONS FME804 ON BH550* NME654 ON BH801* The Nameplate is located on the back of the machine. A Serial Number Plate is located inside the cabinet, behind the front panel. *Bin Top Kit Required January 2007 Page 3
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NME454, 654 & FME504, 804 FOR THE INSTALLER Location: Water Limitations: Install the machine be installed in a location where it has enough space around it to be accessible for An ice machine is a food manufacturing plant: it service. A minimum of 6" must be allowed at the takes a raw material, water, and transforms it into a food product, ice. The purity of the water is very back and sides for air circulation on air cooled important in obtaining pure ice and in maximizing models. Try to avoid h
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NME454, 654 & FME504, 804 FOR THE INSTALLER: Location ALLOW AIR SPACE ON BOTH SIDES TWO UNITS ON ONE BIN ALLOW ROOM FOR AIR CIRCULATION AND SERVICE ACCESS Airflow Notice: Airflow changed in 2006. Prior model's air flow was in the front and out the back. Current model's (shown) air flow is in the sides and out the back. March 2006 Page 5
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NME454, 654 & FME504, 804 FOR THE PLUMBER CONFORM TO ALL APPLICABLE CODES Water Inlet Drains 3 Air Cooled Models: Use " O.D. copper tubing to Air Cooled Models: Connect a drain tube to the 8 3 connect cold potable water to the " male flare ¾" FPT drain at the back of the cabinet, the drain 8 fitting at the back of the cabinet. Install a hand line is of the gravity type, and ¼ inch per foot fall valve near the machine to control the water supply. is an acceptable pitch for the drain tubing. There
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NME454, 654 & FME504, 804 FOR THE ELECTRICIAN CONFORM TO ALL APPLICABLE CODES Connect the electrical power to the machine to the The ice machine should be connected to its own wires in the junction box at the rear of the machine. electrical circuit so it would be individually fused. Voltage variation must remain within design Check the nameplate (located on the back panel) limitations, even under starting conditions. for the voltage requirements, and for the minimum circuit ampacity. The machine
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NME454, 654 & FME504, 804 FOR THE INSTALLER Final Check List 1. Is the ice system installed indoors in a location where the air and water temperatures are controlled, and where they do not exceed the design limitations? 2. Is there an electrical service disconnect within sight of the installed machine? Has the voltage been checked, and compared to nameplate requirements? 3. Have all the plumbing connections been made and checked for leaks? 4. Has the machine and bin been leveled? 5. Is there a m
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NME454, 654 & FME504, 804 INITIAL START UP Pre-Start Inspection 1. Remove the front and side service panels. are rubbing each other. Check that the fan blade turns freely (air cooled). 2. Check that any shipping blocks have been removed. 4. Check that the unit is installed correctly according to the final check list (page 8). 3. Inspect the interior of the machine for loose screws or wires. Check that no refrigerant lines Start Up 1. Go through the prestart inspection. The air cooled discharge
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NME454, 654 & FME504, 804 COMPONENT DESCRIPTION Control Box: Contains the electrical controls that automatically as the level of ice in the bin changes. operate the machine. Gear Motor: An oil filled, speed reduction High Pressure Cut Out Switch: An automatic gearbox, driving the auger. reset switch sensing the high side refrigeration Condenser: Air or water cooled, where the heat pressure. It is set to shut the machine off if the removed in ice making is discharged. discharge pressure should ev
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NME454, 654 & FME504, 804 COMPONENT DESCRIPTION Evaporator: A refrigerated vertical tube filled with Breaker: Where the ice is compressed and much water and containing a water seal and auger. of the extra water is squeezed out of it before it is discharged into the bin. Auger: A solid stainless steel double spiral auger, it pushes the ice crystals up to the top of the Motor: The motor that drives the gear reducer evaporator. and auger. Water Seal: A two part “face” seal, the top half Thrust Bear
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NME454, 654 & FME504, 804 CONTROL BOX COMPONENTS Contactor: A definite purpose contactor The loads include: connecting the compressor to the power supply. Compressor contactor AutoSentry Control Board Auger drive motor The control board receives input signals from The control board also includes several indicator several sensors and translates them to control the lights. electrical power supply to the various loads. Potential Relay: The compressor start relay. The sensors include: On/Off (mod
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NME454, 654 & FME504, 804 ELECTRICAL SEQUENCE: There are 7 indicator lights on the control board: Shut Down: WTR-OK (Water OK). Green. Normal = The compressor relay opens, LED1 goes out. Glowing. Glows when there is water in the The compressor contactor opens reservoir. The compressor stops PWR-OK (Power OK). Green. Normal = The auger motor stays on for 1 more minute, Glowing. Glows when the control board has clearing out ice in the evaporator, and then power and is functional. The auger
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NME454, 654 & FME504, 804 OPERATION: Water Water enters the machine through the 3/8" male flare at the rear of the cabinet, goes to the water reservoir which it enters through the float valve. The water then goes out the bottom of the Water Level: The correct water level should be reservoir tank to the bottom of the evaporator. checked when the machine is making ice. Check the Reservoir overflow or evaporator condensation is water level in the reservoir and compare it to the routed to the drain.
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NME454, 654 & FME504, 804 OPERATION: Refrigeration Beginning at the compressor, the refrigerant is At the evaporator, the refrigerant enters an area of compressed into a high temperature gas. The relatively low pressure, where it can easily “boil off” discharge line directs this gas to the condenser. At or evaporate. As it evaporates, it absorbs heat the condenser (air or water cooled) the gas is from the evaporator and whatever is in contact with cooled by either air or water and it then conden
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NME454, 654 & FME504, 804 OPERATION: Performance Typical Low Side Pressure Air Cooled: 34 - 38 PSIG Water Cooled: 32 PSIG Typical Discharge Pressure Air Cooled: 220 - 300 PSIG Water Cooled: 245 PSIG Typical Compressor Amp Draw 8-9 Typical Auger Drive Motor Amp Draw (115 volt) 3.1 to 3.5 - Emerson 4to4.5-GE Superheat 5 - 7 degrees High Pressure Cut Out - automatic reset 450 PSIG Low Pressure Cut Out - automatic reset 15 PSIG Fan Motor Watts 35 Watt January 2007 Page 16
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NME454, 654 & FME504, 804 CLEANING & SANITIZING A Scotsman Ice System represents a sizable investment of time and money in any company’s business. In order to receive the best return for that investment, it MUST receive periodic maintenance. It is the USER’S RESPONSIBILITY to see that the unit is properly maintained. It is always preferable, and less costly in the long run, to avoid possible down time by keeping it clean; adjusting it as needed; and by replacing worn parts before they can cause
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NME454, 654 & FME504, 804 SENSOR MAINTENANCE 1. The bin control is a device that senses light, 2. The ice machine senses water level by a probe therefore it must be kept clean so it can “see”. At located in the water reservoir. At least twice a year, least twice a year, remove the bin control sensors the probe should be removed from the reservoir, from the base of the ice chute, and wipe the inside and the tip wiped clean of mineral build-up. clean, as illustrated. ICE LEVEL SENSORS SLIDE TO REM
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NME454, 654 & FME504, 804 AIR COOLED MAINTENANCE Hazardous Moving Parts. Moving fan blade can cause personal injury. Disconnect electrical power before beginning. Clean the air cooled condenser. The air flow on this model is from front to back, so the inside of the machine will have to be available to clean the air cooled condenser. Use a vacuum cleaner or coil cleaner if needed. Do NOT use a wire brush. A. Disconnect electrical power, and remove the filter. The filter may be cleaned or replaced
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NME454, 654 & FME504, 804 BEARING MAINTENANCE The bearing in the breaker should also be checked unscrewing the auger stud at least two times per year. A. Check the bearing by: Auger Stud removing the ice chute cover Chute Cover Cap Screw Inspect the bearing. There should be plenty of grease in sight. If grease is needed the bearing and breaker should be removed to check the action of the bearing. It should rotate smoothly. To remove the breaker remove the lower ice chute then take out all four
