Scotsman NME454 - Manual

FOR THE PLUMBER CONFORM TO ALL APPLICABLE CODES Water Inlet Air Cooled Models: Use 3 8 " O.D. copper tubing to connect cold potable water to the 3 8 " male flare fitting at the back of the cabinet. Install a handvalve near the machine to control the water supply. Water Treatment: In most are...

FOR THE ELECTRICIAN CONFORM TO ALL APPLICABLE CODES Connect the electrical power to the machine to thewires in the junction box at the rear of the machine.Check the nameplate (located on the back panel)for the voltage requirements, and for the minimumcircuit ampacity. The machine requires a solidcha...

FOR THE INSTALLER Final Check List 1. Is the ice system installed indoors in a location where the air and watertemperatures are controlled, and wherethey do not exceed the design limitations? 2. Is there an electrical service disconnect within sight of the installed machine? Hasthe voltage been chec...

INITIAL START UP Pre-Start Inspection 1. Remove the front and side service panels. 2. Check that any shipping blocks have beenremoved. 3. Inspect the interior of the machine for loosescrews or wires. Check that no refrigerant lines are rubbing each other. Check that the fan bladeturns freely (air co...

COMPONENT DESCRIPTION Control Box: Contains the electrical controls that operate the machine. High Pressure Cut Out Switch : An automatic reset switch sensing the high side refrigerationpressure. It is set to shut the machine off if thedischarge pressure should ever exceed 450 PSIG. Low Pressure Cut...

CONTROL BOX COMPONENTS Contactor: A definite purpose contactor connecting the compressor to the power supply. AutoSentry Ô Control Board The control board receives input signals fromseveral sensors and translates them to control theelectrical power supply to the various loads.The sensors include: · ...

OPERATION: Refrigeration Beginning at the compressor, the refrigerant iscompressed into a high temperature gas. Thedischarge line directs this gas to the condenser. Atthe condenser (air or water cooled) the gas iscooled by either air or water and it then condensesinto a liquid. This high pressure li...

NME454, 654 & FME504, 804 January 2007 Page 16 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 Dr...

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 i...

1. The bin control is a device that senses light,therefore it must be kept clean so it can “see”. Atleast twice a year, remove the bin control sensorsfrom the base of the ice chute, and wipe the insideclean, as illustrated . 2. The ice machine senses water level by a probelocated in the water reserv...

NME454, 654 & FME504, 804 January 2007 Page 19 Clean the air cooled condenser. The air flow on this model is from front to back, sothe inside of the machine will have to be availableto clean the air cooled condenser. Use a vacuumcleaner or coil cleaner if needed. Do NOT use awire brush.A. Discon...

The bearing in the breaker should also be checkedat least two times per year . A. Check the bearing by: · removing the ice chute cover · unscrewing the ice sweep · removing the water shed & unscrewing thebreaker cover (left hand threads). · unscrewing the auger stud Inspect the bearing. There sh...

AUGER MAINTENANCE In some areas, the water supply to the ice makerwill contain a high concentration of minerals, andthat will result in an evaporator and augerbecoming coated with these minerals, requiring amore frequent removal than twice per year. If indoubt about the condition of the evaporator a...

NME454, 654 & FME504, 804 January 2007 Page 22 SERVICE DIAGNOSIS Symptom Possible Cause Probable Correction No ice is made, nothing operates Unit off due to no power Restore Power Unit off due to master switch in OFFposition. Switch master switch to ON. Unit off due to low water level. Check wat...

NME454, 654 & FME504, 804 January 2007 Page 24 CONTROL SYSTEM DIAGNOSTICS The control system consists of: · Control Board · Water Sensor · Ice Sensors · High Pressure Cut Out · Low Pressure Cut Out If the unit is OFF, check the control board: 1. Is the Power OK light on? If not check power tothe...

BIN CONTROLS (Ice Level Sensors) 1. Disconnect electrical power.2. Remove front panel.3. Remove control box cover.4. Locate ice chute, at the base of the chute, infront of and behind it are two plastic bin controlmounts.5. Slide each bin control to the left, and in thecontrol box, disconnect the ele...

NME454, 654 & FME504, 804 January 2007 Page 26 REMOVAL AND REPLACEMENT: Bearing And Breaker Note: Removal of the auger, water seal,evaporator and gear reducer must begin at the topof the assembly. To Remove the Breaker Bearing Assembly: 1. Remove panels and disconnect electrical power.2. Pull th...

To Remove the Auger: Turn off the water to the machine, and unclip theevaporator drain hose, pull it down and drain theevaporator into the bin or a container.1. The top panel must be removed.2. Remove bail clip and remove ice chute cover.3. Unscrew ice sweep.4. Remove ice chute body.5. The auger and...

To Remove the Water Seal: (Assuming all steps to remove the auger havebeen performed.)1. The gearmotor/evaporator assembly will have tobe exposed.2. Remove the 4 hex head cap screws holding theevaporator to the gearmotor assembly. Lift theevaporator up and off of the gearmotor.3. Remove the snap rin...

To Replace the Evaporator: (Assuming all the steps for removal of the thrustbearing, breaker, auger, and water seal have beenperformed.)1. Recover the refrigerant from the ice maker.2. Unsweat the refrigerant connections: a) At the thermostatic expansion valve outlet. Heat sink the TXV body when uns...

To Check the Motor: 1. Remove wires from terminals 1 and 2.2. Use an ohmmeter to check for continuity. Ifthere is none, replace the motor only. If there iscontinuity, but the motor will not start, check themotor's start switch.3. Remove motor end bell or motor stator. Withohmmeter wires attached to ...

NME454, 654 & FME504, 804 January 2007 Page 31 REFRIGERATION SYSTEM SERVICE General: This ice machine uses R-404A refrigerantand polyolester oil. Do NOT use mineral oil in thisrefrigeration system. · When the system is serviced, a special liquidline drier is required. It is included withreplacem...

NME454, 654 & FME504, 804 January 2007 Page 32 WHAT TO DO BEFORE CALLING FOR SERVICE If the machine is off, not making ice: 1. Check the water supply to the icemachine. The machine is designed toshut off if there is no water to it. Checkthe filters if there are any. 2. Check the power supply to ...