NME1850 & FME2400 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 product contains 2 separate ice making systems in one cabinet. TABLE OF CONTENTS Installation For the Installer Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Storage Bin . . . . . . . . . . . . . . . . . . . . . .
NME1850 & FME2400 FOR THE INSTALLER BACK VIEW The FME2400 and the NME1850 are designed to fit the following Scotsman storage Condenser Inlet (W/C): 3/8" FPT bins: B90 and extensions (with bin top KBT18) BH800 no bin top required. 9.5" 5.25" BH900 using bin top KBT14. BH1360, no bin top required.
NME1850 & FME2400 FOR THE INSTALLER: Environmental Limitations Installation Limitations: This ice system is designed to be installed indoors, in a controlled environment: Min Max 0 Air Temperature 50 F 1000F Water Temperature 400F 1000F Water Pressure 20 PSI 80 PSI Voltage -5% +10% (Compared to the nameplate) Operating the machine outside of the limitations is misuse and can void the warranty.
NME1850 & FME2400 FOR THE INSTALLER Location: Typical Storage Bin with Extension and Bin Top After uncrating and inspection, the unit is ready for installation. It is important that the machine be installed in a location where it has enough space around it to be accessible for service, and minimum of 6" be allowed at the back for air circulation on air cooled models. Try to avoid hot, dirty and crowded locations. Be sure that the location for the machine is within the limitations described on page 3.
NME1850 & FME2400 FOR THE INSTALLER: Location ALLOW ROOM FOR AIR CIRCULATION AND SERVICE ACCESS DO NOT STACK ANYTHING IN FRONT OF THE MACHINE(S) January 1994 Page 5
NME1850 & FME2400 FOR THE PLUMBER CONFORM TO ALL APPLICABLE CODES Water Inlet Drains Air Cooled Models: The recommended water supply is clean, cold water. Use 3/8" O.D. copper tubing, and connect to the single 3/8" male flare at the back of the cabinet. This connection supplies water to both ice making systems. Install a hand valve near the machine to control the water supply. Water Treatment: In most areas, a water filter of some type will be useful.
NME1850 & FME2400 FOR THE ELECTRICIAN CONFORM TO ALL APPLICABLE CODES The electrical power to the unit is supplied through the junction box at the rear of the machine. Check the nameplate (located on the back panel) for the voltage requirements, and for the minimum circuit ampacity. The machine requires a solid chassis to earth ground wire. The ice maker should be connected to its own electrical circuit so it would be individually fused.
NME1850 & FME2400 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? 5. Is there a minimum of 6" clearance at the back of the machine for proper service access and air circulation? 6. Is the water pressure a minimum of 20 psig? 2.
NME1850 & FME2400 START UP Pre-Start Inspection 1. Remove the front and side service panels. 2. Check that the styrofoam shipping blocks have been removed. 3. Inspect the interior of the machine for loose screws or wires. Check that no refrigerant lines are rubbing each other. Check that the fan blade turns freely (air cooled). 4. Check that the unit is installed correctly according to the final check list (page 8). The following procedure applies to each of the two separate ice making systems.
NME1850 & FME2400 COMPONENT DESCRIPTION Control Box: Contains the electrical controls that operate the machine. High Pressure Cut Out Switch : A manual reset switch sensing the high side refrigeration pressure. It is set to shut the machine off if the discharge pressure should ever exceed 450 psig. Evaporator: A vertical stainless steel tube, refrigerated, and water filled. In it there is a stainless steel auger. Compressor: The refrigerant vapor pump.
NME1850 & FME2400 COMPONENT DESCRIPTION: Control Box Contactor: A definite purpose contactor connecting the compressor and the remote condenser fan motor to the power supply. Circuit Board: Controlling the ice machine through sensors and relays. The sensors are for ice level and water level. The relays are for the gear motor (with a built in time delay to clear the evaporator of ice when the unit turns off) and for the compressor contactor. Transformer: Supplies low voltage to the circuit board.
NME1850 & FME2400 COMPONENT DESCRIPTION Evaporator : A refrigerated vertical tube filled with water and containing a water seal and auger. Auger: A solid stainless steel double spiral auger, it pushes the ice crystals up to the top of the evaporator. Water Seal: A two part "face" seal, the top half rotating with the auger, the bottom half stationary, the sealing action being where the two seal "faces" meet. Ice Sweep : A plastic cap with "fingers".
NME1850 & FME2400 ELECTRICAL SEQUENCE Refer the wiring diagram as needed. The following description applies to either one of the two ice making systems. They operate independently of each other. If the machine is switched off at the master switch, but is otherwise ready to go, switching the master switch to on does the following: • The bin empty light on the circuit board goes on • There is a 15 second delay • If there is enough water in the reservoir, the circuit board will allow the machine to start up.
NME1850 & FME2400 OPERATION: Water Water enters the machine through the 3/8" male flare at the rear of the cabinet, splits into two separate lines, flows to a strainer at each reservoir and then to each water reservoir which it enters through the float valve. The water then goes out the bottom of the reservoir tanks to the bottom of each evaporator. Reservoir overflow or evaporator condensation is routed to the drain.
NME1850 & FME2400 OPERATION: Refrigeration The following description applies to each of the two separate ice making systems. Beginning at the compressor, the refrigerant is compressed into a high temperature gas. The discharge line directs this gas to the condenser. At the condenser (air or water cooled) the gas is cooled by either air or water and it then condenses into a liquid. This high pressure liquid then goes through the liquid line to the expansion valve.
NME1850 & FME2400 MAINTENANCE AND CLEANING To properly clean and maintain this product, these steps must be followed for both systems. 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.
NME1850 & FME2400 MAINTENANCE AND CLEANING These steps must be followed for both systems. ICE LEVEL SENSORS: SLIDE TO REMOVE Disconnect electrical power before beginning. 1. The bin control uses devices that sense light, therefore they must be kept clean enough so that they can ‘‘see’’. At least twice a year, remove the bin control sensors from the base of the ice chute, and wipe the inside clean, as illustrated. 2. The ice machine senses water level by a probe located in the water reservoir.
NME1850 & FME2400 MAINTENANCE: Air Cooled 5. Clean each air cooled condenser. Use a vacuum cleaner or coil cleaner if needed. Do NOT use a wire brush. FAN MOTOR ASSEMBLY Disconnect electrical power before beginning. A. Remove top panel. TOP PANEL C. Pull fan motor assembly off of locating pins and out of the unit. B. Remove two screws, and unplug the fan motors. CAP SCREW LOCATING PINS UNPLUG LEADS D.
NME1850 & FME2400 MAINTENANCE AND CLEANING: Auger 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 /////////////WARNING/////////////// inspected.
NME1850 & FME2400 SERVICE DIAGNOSIS: Condition - No Ice Being Produced STATUS: NOTHING OPERATES A. Check: Voltage to the unit, restore it if there is none. Compare to the nameplate. B. Check: The master switch , switch ON if off. C. Check: The 2 reset switches , (high and low pressure): depress and release each switch. If the still does not start, check: the spout switch; the high and the low side pressures. D.
NME1850 & FME2400 SERVICE DIAGNOSIS: Condition - No Ice Being Produced STATUS: NOTHING OPERATES G. Check: The gear motor , if it will not run, the compressor will not run. If no power to it: Check: The indicator lights on the circuit board, the bin empty light should be ON, the no water light should be OFF . 1. If the bin empty and no water lights are off, check the transformer . a. Transformer ‘‘load’’ side should have 12 to 15 volts. If not, check the ‘‘line’’ side.
NME1850 & FME2400 SERVICE DIAGNOSIS: Condition - No Ice Produced STATUS: GEAR MOTOR OPERATES, COMPRESSOR DOES NOT A. Check the compressor relay. The relay is on the circuit board, if it does not supply power to the contactor coil, the compressor will not run. 1. Check for power at the contactor coil, if none: a. Check for power at the compressor relay at the circuit board. If there is power at the relay, but none at the contactor coil, Check for an open wire between the relay and the contactor. 2.
NME1850 & FME2400 SERVICE DIAGNOSIS: Condition - Low Ice Production STATUS: EVERYTHING IS OPERATING A. Check the air cooled condenser for dirt. Clean as required. Check the head pressure on water cooled. Adjust as required. If the head pressure is very high: 1. Air cooled. Check for high air temperatures, or restrictive air flow. Correct as needed. 2. Water cooled. Check for high water temperatures, or low water pressure. Correct as needed. 3.
NME1850 & FME2400 REMOVAL AND REPLACEMENT: Water Reservoir & Bin Controls WATER RESERVOIR 1. Shut off water supply. 2. Remove front panel. 3. Remove reservoir cover. 4. Disconnect water inlet tube from reservoir inlet fitting. 5. To remove float valve, push in on "locking tab" as shown and pull valve up. Note: The plunger/seat is available as a separate part. 6. To remove reservoir, pull up and remove water sensor. 7. Disconnect water outlet tubes. 8. Remove the two screws holding reservoir to bracket. 9.
NME1850 & FME2400 REMOVAL AND REPLACEMENT: Bearing And Breaker Note: Removal of the auger, water seal, evaporator and gear motor must begin at the top of the assembly. To Remove the Breaker Bearing Assembly: Disconnect electrical power before beginning. 1. Remove panels and disconnect electrical power. 2. Push bail clamp back and remove ice chute cover. 3. Unscrew and remove ice sweep. 4. Remove insulation halves from outside of ice chute, loosen band clamp under ice chute, lift up and remove ice chute.
NME1850 & FME2400 REMOVAL AND REPLACEMENT: Auger To Remove the Auger: Turn off the water to the machine, and unclip the evaporator drain hose, pull it down and drain the evaporator into the bin or a container. 1. The top panel must be removed. Disconnect electrical power before beginning Use care when removing the auger, it has very sharp edges. 2. Remove ice chute cover. 3. Unscrew ice sweep. 4. Loosen band clamp and remove ice chute body. 5.
NME1850 & FME2400 REMOVAL AND REPLACEMENT: Water Seal To Remove the Water Seal: (Assuming all steps to remove the auger have been performed.) 1. The gear motor/evaporator assembly will have to be exposed. 2. Remove the 4 hex head cap screws holding the evaporator to the gear motor assembly. Lift the evaporator up and off of the gear motor. 3. Remove the snap ring or wire retainer from the grove under the water seal. 4. Pull or drive out the lower half of the water seal.
NME1850 & FME2400 REMOVAL AND REPLACEMENT: Evaporator To Replace the Evaporator: (Assuming all the steps for removal of the thrust bearing, breaker, auger, and water seal have been performed.) Disconnect electrical power before beginning. 1. Discharge the refrigerant from the ice maker. 2. Unsweat the refrigerant connections: a) At the thermostatic expansion valve outlet. CAUTION Heat sink the TXV body when unsweating or resweating the adjacent tubing. 6. Install an new drier in the liquid line. 7.
NME1850 & FME2400 REMOVAL AND REPLACEMENT: Gearmotor Disconnect electrical power before beginning. CENTRIFUGAL SWITCH WATER SHED SEAL AUGER DRIVE MOTOR COVER & OUTPUT GEAR ASSEMBLY ROTOR BEARING SEAL Note: There are two gear motors in each unit. To Remove and Repair the Gearmotor Assembly: (Assuming that the procedures through removal of the water seal have been performed.) 1. Remove the electrical wires from the gear drive motor. 2.
NME1850 & FME2400 REMOVAL AND REPLACEMENT Removing Condenser Fan Motor Assembly FAN MOTOR ASSEMBLY Disconnect electrical power before beginning. CAP SCREWS LOCATING PINS FAN MOTOR WIRE 1. Remove the top panel. 2. Unplug the two fan motor wire leads from the fan motors. 3. Remove two hex head bolts from top end of fan motor assembly, (see the illustration). 4. Lift up, and pull out the fan motor assembly. 5. Repair as needed. 6.
NME1850 & FME2400 Removal and Replacement: Refrigeration System This ice machine uses R-404A refrigerant and polyolester oil. Do NOT use mineral oil in this refrigeration system. • R-404A is a "Near Azeotrope" so liquid charging is required: • When the system is serviced, a special liquid line drier is required. It is included with replacement compressors. • HP62 is not compatible with mineral oil, so these ice machines use Polyolester oil. Polyolester oil absorbs water very easily.
NME1850 & FME2400 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. Make all connections to the circuit board with the ELECTRICAL POWER OFF. INSTRUCTIONS FOR USING TESTER, (Optional, order part no.
