Service Manual - NDE554, NDE654

INTRODUCTION NDE554 & NDE654To the owner or user: The service manual you are The ice making section is equipped with thereading is intended to provide you, and the following features: electronic controls for bin levelmaintenance or service technician with the and low water; thermostatic expansion valve; frontinformation needed to install, start up, clean, service for most components; and R-404A (HP62)maintain, and service this ice maker-dispenser. refrigerant. The ice dispensing section is a seamless plastic storage bin, with a stainless steelThis machine is a combination nugget ice maker rotating vane to sweep the ice into the dispensingand countertop dispenser, with the option of wall chute.mounting.Table of ContentsFOR THE INSTALLER: Specifications · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 2FOR THE INSTALLER: Environmental Limitations · · · · · · · · · · · · · · · · · · · · · · · · Page 3FOR THE INSTALLER · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 4FOR THE INSTALLER: Wall Mount Kit · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 5FOR THE PLUMBER · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 6FOR THE ELECTRICIAN · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 7FOR THE INSTALLER: Final Check List · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 8INITIAL START UP · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 9COMPONENT DESCRIPTION · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 10COMPONENT DESCRIPTION · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 11COMPONENT DESCRIPTION: Control Box · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 12ELECTRICAL SEQUENCE · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 13OPERATION: Water · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 14OPERATION: Refrigeration · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 15OPERATION: Ice Vending · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 16CLEANING and SANITIZING · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 17SENSOR MAINTENANCE · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 18BEARING MAINTENANCE · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 19AUGER MAINTENANCE · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 20SERVICE DIAGNOSIS: · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 21SERVICE DIAGNOSIS · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 22CONTROL SYSTEM DIAGNOSTICS · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 23REMOVAL AND REPLACEMENT · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 24REMOVAL AND REPLACEMENT: Bearing And Breaker · · · · · · · · · · · · · · · · · · · · Page 25REMOVAL AND REPLACEMENT · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 26REMOVAL AND REPLACEMENT: Water Seal · · · · · · · · · · · · · · · · · · · · · · · · · · Page 27REMOVAL AND REPLACEMENT · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 28TO REMOVE AND REPAIR THE GEARMOTOR ASSEMBLY · · · · · · · · · · · · · · · · · · Page 29REFRIGERATION SERVICE · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 30 Note this symbol when it appears. It marks a possible hazard.March 2000 Page 1

NDE554 & NDE654FOR THE INSTALLER: SpecificationsThis ice maker-dispenser is designed to be Before beginning the installation, check that all themounted on a machine stand, or a countertop, or materials and kits required are available at theusing wall mounting kit KWB3, hung from a wall. installation location.The sink may be retained, or removed and theoptional longer splash panel (KSP1B) installed inplace of the original. Instructions for each kit areincluded in this manual.20.5\" 3.54\" ELECTRICAL JUNCTION BOX 4.5\" NAMEPLATE on side panel 14.06\" 2.56\" 3/8\" FPT 1.88\"dia Condenser Water Inlet (Water Cooled) 3/8\" Flare Potable Water Inlet 5.12\" Optional for water and drain lines 1/2\" FPT 12.27\" 3.12\" 6.43\" Cond. Drain 1.12\"22.5\" Serial Number Plate (Water Cooled) inside on upper base 3/4\" FPT DrainSPECIFICATIONS Condenser Basic Electrical Min. Circ. Max Ref. Charge Type Ampacity Fuse R-404A (oz)Model Number Dimensions Size w\" x d\" x h\" 19.1 25 24 17.9 20 18NDE554AS-1A 26 x 22 12 x 41 Air 115/60/1 24NDE554WS-1A same Water same 19.3 25 18NDE554AS-6A same Air 230/50/1 17.8 20 24NDE554WS-6A same Water same 18NDE654AS-1A 26 x 22 12 x 48 Air 115/60/1 24NDE654WS-1A same Water same 18NDE654AS-6A same Air 230/50/1NDE654WS-6A same Water same March 2000 Page 2

NDE554 & NDE654FOR THE INSTALLER: Environmental LimitationsInstallation LimitationsThis ice system is designed to be installed indoors, Service Limitationsin a controlled environment. Do not install in a location where the top of the machine is within 6\" of a fixed ceiling. Do not installAir Temp Minimum Maximum air cooled models in a location where there is lessWater Temp 500F. 1000F. than 6\" clearance to the left and right of the 400F. 1000F. cabinet.Water Pressure 20 PSI 80 PSIVoltage (115v) 104 126Voltage (240v) 207 253Operating the machine outside of the abovelimitations, or outdoors, is potentially damaging tothe machine; also it is misuse of the machine,which may void the warranty.Scotsman Ice Systems are designed andmanufactured with the highest regard for safety CEILINGand performance. They meet or exceed the CUT AWAYstandards of UL, NSF, and CUL.Scotsman assumes no liability or responsibility ofany kind for products manufactured by Scotsman SPACE ABOVEthat have been altered in any way, including the WALL FORuse of any part and/or other components not SERVICEspecifically approved by Scotsman. CUT AWAYScotsman reserves the right to make designchanges and/or improvements at any time.Specifications and design are subject to changewithout notice.Water Limitations 6\" SPACE FOR AIRAn ice machine is a food manufacturing plant; ittakes a raw material, water, and turns it into a food (A/C)product, ice. The purity of the water is veryimportant in obtaining pure ice and in maximizing Airflowproduct life. This section is not intended as acomplete resource for water questions, but it does SPACEoffer these general recommendations: FOR1. Filter the water used to produce ice. That is the UTILITIESwater going to the “potable” water connection. 6\" SPACEWater filters vary greatly in ability and function. FOR AIRInstall one that filters out suspended solids to adimension of 5 microns or smaller. The finer thefilter the better, but finer filters will clog sooner thancourse ones. It may be necessary to add a coursefilter ahead of the fine filter to prolong filter life.2. Check with a water treatment specialist for awater test, and recommendations regarding filtersand treatment. March 2000 Page 3

NDE554 & NDE654 SEAL THE UNIT TOFOR THE INSTALLER THELocation COUNTERAfter uncrating and inspection, the unit is ready for OR STANDinstallation. It is important that the machine beinstalled in a location where it has enough spaceabove and behind it for service. Air cooled modelsrequire a minimum of 6 inches to the left and rightof the machine for air circulation.Machine Stand InstallationTip the stand on its back and install the legs, returnthe stand to the upright position. Adjust leg levelersso that the stand does not “rock”.Counter Top or Machine Stand InstallationThe base of the icemaker-dispenser must besealed to the object it rests upon. Food gradesilastic sealant such as Scotsman part number19-0529-01 is recommended.Place a bead of the sealant on the machine standor counter top to match the outside edge of thecabinet base and sink.The icemaker-dispenser is heavy: use of amechanical hoist is recommended to lift it to theheight required to install it.Follow the instructions packed with the machinestand for proper connection to the dispenser. Thedispenser must be bolted to the machine standfrom inside the stand.In both counter top and machine standinstallations, wipe off and neatly smooth anyexcess sealant. Level the machine stand andcabinet.Unpack and install the sink brackets.The hardware for the sink brackets is packed withthe sink. Screw one bolt into all four holes to tapthem BEFORE attaching the brackets. Attach thebrackets and place the sink assembly onto the twosink brackets. Push down at the back to seat thesink onto the brackets.Press the sink onto the bead of sealant. Wipe offand neatly smooth any excess sealant from underthe sink edge. March 2000 Page 4

NDE554 & NDE654FOR THE INSTALLER: Wall Mount Kit CAUTION BASE SIDE HOLE ROUTINGIt is recommended that the wall mountinginstallation be done by an experienced contractor.The weight of the machine when in use mayexceed 350 pounds. The unit should be mountedon a solid, rigid wall with proper fasteners for thattype of wall and of adequate strength to supportthe weight of the machine when in use.Clearance between the wall and the icemaker is a 1\" CLEARANCEmaximum of 1 inch. Check utility connections first.The electrical junction box will have to be removed,and the electrical connections made inside thecabinet in compliance with local codes. Theplumbing connections may be made through thebase, or at either side through the pre-punchedholes, using standard plumbing practices.Interior plumbing lines must be disconnected fromthe original connections and plugged when routing X\"through the side or base.1. Remove machine top. Attach bracket “A” to 7.58machine using (3) nuts, (3) flat washers, (3) lockwashers, and (3) 5/16-18 bolts received with thekit. 16\" X = 30\" for NDE554 16\" X = 38.6\" for NDE654 DO NOT LIFT ON SINK A 2. Mount brackets “B” and “C” to the wall at the dimensions shown for the unit. (hardware for this is not included).B Use fasteners and wall of sufficient strength to carry the use and weight of the icemaker-dispenser. 12\" 3. Lift unit up and hook bracket “A” over bracket 12\" “B”. Slide unit until the two remaining holes are aligned and secure with the remaining (2) 1/4-20 bolts, flat washers and lock washers.C March 2000 Page 5

NDE554 & NDE654FOR THE PLUMBER CONFORM TO ALL APPLICABLE CODESWater InletAir Cooled Models: Connect a potable, cold watersupply to the 3/8\" male flare at the back of thecabinet. Install a hand valve near the machine tocontrol the water supply. 3/8\" O.D. copper tubing isrecommended.Water Treatment: In most areas, a water filter of WATER INLETsome type will be useful. In areas where the wateris highly concentrated with minerals the watershould be tested by a water treatment specialist, CABINETand the recommendations of the specialist DRAINregarding filtration and/or treatment should befollowed. OPTIONAL WATERWater Cooled Models: Connect a separate 3/8\" FILTERO.D. copper line with a separate hand valve tocontrol it to the 3/8\" FPT condenser inlet at theback of the cabinet. The water pressure to all linesmust always be above 20 psig, and below 80 psig.Drains WATER INLET SHUT OFFAir Cooled Models: There is one ¾ \" FPT drain at VALVEthe back of the cabinet, the drain line is of thegravity type, and ¼ inch per foot fall is an VENTEDacceptable pitch for the drain tubing. There should DRAIN TUBEbe a vent at the highest point of the drain line, andthe ideal drain receptacle would be a trapped and FLOOR DRAINvented floor drain. Use only ¾ \" rigid tubing.Water Cooled Models: In addition to the abovementioned drain, a separate condenser drain mustbe installed. Connect it to the ½ \" condenser drainconnection at the back of the cabinet. WATER COOLED DETAIL CONDENSER WATER INLET POTABLE CABINET WATER INLET DRAIN March 2000 CONDENSER Page 6 DRAIN

NDE554 & NDE654FOR THE ELECTRICIANCONFORM TO ALL APPLICABLE CODESConnect the electrical power to the unit ELECTRICALto the power leads in the junction box at POWERthe rear of the machine.Check the nameplate (located on theback panel) for the voltagerequirements, and for the minimumcircuit ampacity. The machine requiresa solid chassis to earth ground wire.The ice maker should be connected toits own electrical circuit so it would beindividually fused. Voltage variationmust remain within design limitations,even under starting conditions.All external wiring must conform tonational, state, and local electricalcodes. The use of a licensedelectrician is required to perform theelectrical installation. JUNCTION BOX March 2000 Page 7

NDE554 & NDE654FOR THE INSTALLER: Final Check List1. Is the icemaker-dispenser installed indoors, in a BACK VIEW OF COMPLETED INSTALLATIONlocation where the air and water temperatures are ELECTRICAL?controlled, and where they do not go beyonddesign limitations?2. Is there an electrical service disconnect within LEVELED?sight of the installed machine? Is the machine on aseparate circuit? Has the voltage been checkedand compared to nameplate requirements?3. Have all of the plumbing connections beenmade and checked for leaks?4. Has the machine been leveled? ICEMAKER DISPENSER5. Is there a minimum of 6 inches of clearance atthe left and right sides of an air cooled machine? PLUMBING?6. Is there a minimum of 6 inches of clearance atthe top and back of the machine for service andutility connections?Wall mounted only: Is the machine properlyinstalled and secured to the wall?7. Is there a water shut off valve installed near themachine?8. Have all of the shipping blocks been removed? MACHINE STAND March 2000 Page 8

NDE554 & NDE654INITIAL START UPPre Start Inspection1. Remove the two front panels.2. Check that all shipping blocks have beenremoved.3. Remove any and all packing tape (check insidethe storage bin).4. Inspect the interior of the machine for loosescrews or wires. Check that no refrigerant lines arerubbing each other. Check that the fan blade on aircooled models turns freely.5. Check that the machine is installed correctlyaccording to the final check list.Start Up 8. Switch off the icemaker-dispenser, remove the1. Go through the pre start inspection. top panel and the top of the ice storage bin. Sanitize the interior of the ice storage bin with a2. Open the water hand valve, observe that water locally approved sanitizer. A possible sanitizer is aenters the water reservoir, fills the tube from the mixture of 1 ounce of household bleach to 2reservoir to the evaporator and then shuts off. gallons of water. Wash the interior of the bin withCheck for leaks. the sanitizer. Replace all covers and panels. Switch the icemaker-dispenser back on.3. Switch the master switch on. The electrical startup sequence is automatic: 9. Give the owner/user the service manual,A. There will be a short (15 second) delay before instruct him/her in the operation and maintenancethe gearmotor starts. requirements of the unit. Make sure they know whoB. After the gearmotor starts, the compressor will to call for service.start. 10. Fill out the Customer Evaluation and Warranty4. On air cooled models, warm air will begin to flow Registration form, and mail it in to Scotsman.from the condenser. Water cooled models willbegin to discharge warm water down the drain.5. The unit should soon be making ice. If desired,the low side pressure may be checked: it should be38 PSIG + or - 2 PSIG.The air cooled discharge pressure will dependupon air and water temperatures, but should bebetween 240 PSIG and 340 PSIG.Water cooled discharge pressure should be about245 PSIG. If needed, adjust the water regulatingvalve.The above numbers are for new, clean machines.Field values may be somewhat higher or lower.6. There are no adjustments to make, so replacethe panels.7. Check ice dispensing by pushing in on the glassfiller lever. March 2000 Page 9

NDE554 & NDE654COMPONENT DESCRIPTIONControl Box: Contains the electrical controls that Glass Filler Lever: Pushing in on this leveroperate the machine. causes the ice dispensing cycle to occur.High Pressure Cut Out Switch: An automatic Low Pressure Cut Out Switch: An automaticreset switch sensing the high side refrigeration reset control that shuts off the ice machine whenpressure. It is set to shut the machine off if the the low side pressure drops below a preset point,discharge pressure should ever exceed 450 psig. 15 psig.Evaporator: A vertical stainless steel tube,refrigerated, and water filled. In it there is astainless steel auger.Reservoir: Float operated, it maintains the waterlevel in the evaporator at a constant level, it alsocontains the water level sensor.Water Level Sensor: Senses if there is water inthe reservoir to make ice out of. Will shut themachine off it there is none.Ice Level Sensor: Anelectronic “eye”, it senses thepresence of ice in the bottom ofthe ice discharge chute. ICE LEVEL SENSORSOperates to turn the ice WATER LEVELmachine on and off SENSORautomatically as the level of icein the bin changes. EVAPORATORDrain Tube: When uncapped RESERVOIRand lowered, drains theevaporator.Condenser: Air or watercooled, where the heatremoved in ice making isdischarged.Ice Storage Bin Assembly: Aplastic lined, insulated cylinderthat receives, stores anddispenses the ice. Fresh iceenters at the top, and when the CONTROLbin is full enough the ice will be BOXbetween the ice level sensors,and the ice making will stop. Iceis dispensed through a chute at DRAIN TUBEthe bottom front when the binvane sweeps the ice over the HIGH PRESSUREchute. CUT OUT CONDENSER ICE STORAGE BIN GLASS FILLER LEVER LOW PRESSURE CUT OUT March 2000 Page 10

COMPONENT DESCRIPTION NDE554 & NDE654Evaporator: A refrigerated vertical tube filled with Motor: A split phase motor that drives the gearwater and containing a water seal and auger. reducer. Thrust Bearing: As the ice is pushed up theAuger: A solid stainless steel double spiral auger, evaporator, the auger is thrust down, and pressureit pushes the ice crystals up to the top of the from the auger thrust is taken up by this bearing.evaporator. ICE SWEEPWater Seal: A two part “face” seal, the top halfrotating with the auger, the bottom half stationary,the sealing action being where the two seal “faces”meet.Ice Sweep: A plastic cap with “fingers”. It revolveswith the auger to “sweep” the ice into the ice chute.Breaker: Where the ice is compressed and muchof the extra water is squeezed out of it before it isdischarged into the bin. BEARING BREAKER MOTOREVAPORATOR AUGER WATER SEAL March 2000 Page 11

NDE554 & NDE654 COMPONENT DESCRIPTION: Control Box Contactor: A definite purpose contactor connecting the compressor to the power supply. Control 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. Mode Switch: Manual control for the machine. Potential Relay: The compressor start relay. Control BoardWater OK Light Power Light Service Light Freeze LightBin Full LightLED1 Compressor Auger Relay Relay LED3 March 2000 Page 12

NDE554 & NDE654ELECTRICAL SEQUENCEThere 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 power and is functional. clearing out ice in the evaporator, and then ·Service. Red. Normally Off. ·The auger motor relay opens, LED3 goes out ·Freeze. Red. Normally glowing when making and the auger motor stops. ice. The compressor will not restart until 2 minutes or more have passed after the last shut down. ·Bin Full. Red. Normally Off when making ice. If the path between the ice level sensors remains ·LED1. White. Located next to the board’s clear for more than 10 seconds the ice machine will restart. Compressor Relay. Normally Glowing when making ice. Control Board Protection Devices ·LED3. White. Located next to the board’s Auger ·When the water level in the reservoir falls Motor Relay. Normally Glowing when making below the water level sensor’s tip, the WTR-OK ice. light goes out and the machine shuts down.If the machine is switched off at the mode switch, When water refills the reservoir the WTR-OKbut is otherwise ready to go, switching the mode light glows and the machine starts up again.switch to ON does the following: ·If the auger drive motor current becomes ·The PWR-OK light glows. excessive the compressor and auger drive ·If there is water in the reservoir the WTR-OK motor will be switched Off and the Service light will blink. The control board will restart the auger light glows. drive motor in 4 minutes. If during the first 60 seconds after restart the auger motor current ·After 10 seconds the Freeze, LED1 and LED3 stays within limits, the compressor is restarted and the machine returns to normal operation. If lights glow and the machine starts up. the auger motor’s current is excessive within 60Start Up: seconds after the restart, the process will be repeated once more. If during that try the ·The compressor relay and auger motor relay current is still excessive the machine shuts down and must be manually reset. The service become energized, connecting power to the light will then be glowing continuously. windings of the auger motor and contactor coil. ·The contactor is energized, connecting power to the compressor, and the compressor starts.·As ice is made it passes between the ice level To Reset: Disconnect and reconnect electrical power to the machine. sensors but because it is not a continuous stream it only interrupts the sensor’s infrared Other Protection Devices: beam momentarily. The bin full light remains off and the machine stays on until ice builds up in ·If the high pressure cut out switch opens the the bin and blocks the path between the sensors for 6 seconds or longer. When that machine will stop immediately. It will occurs the bin full light glows and the machine automatically reset when the pressure falls shuts down. below its cut in pont. ·If the low pressure cut out switch opens the machine will stop immediately. It will automatically reset when the pressure rises above its cut in point. ·The mode (on - off) switch is the manual control for the complete machine, but it is not a service disconnect. March 2000 Page 13

NDE554 & NDE654 Note: The correct water level is determined when the machine is operating. Check the water level andOPERATION: Water compare it to the line molded into the side of theWater enters the machine through the 3/8\" male reservoir. The water level should be between 18 “flare at the rear of the cabinet, goes to the waterreservoir which it enters through the float valve. above and 14\" below the line.The water then goes out the bottom of thereservoir tank to the bottom of the evaporator. If needed, adjust the water level by bending the float arm.Reservoir overflow, evaporator condensation, bindrainage and water from the sink are all routed to acommon drain. Water cooled models have aseparate water circuit for the cooling water: itenters the fitting at the rear, goes to the waterregulating valve, then to the water cooledcondenser and down the drain.There is also an additional water circuit to anelectric valve. When the water station glass fillerlever is pushed, a switch closes a circuit to theelectric water valve, and water is dispensed.WATER RESERVOIR WATER LEVELWATER INLETWATER DRAIN WATER LINE FOR WATER STATION March 2000 Page 14

OPERATION: Refrigeration NDE554 & NDE654Beginning at the compressor, the refrigerant is At the evaporator, the refrigerant enters an area ofcompressed 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 heatthe condenser (air or water cooled) the gas is from the evaporator and whatever is in contact withcooled by either air or water and it then condenses it (such as the water inside it). After the evaporator,into a liquid. This high pressure liquid then goes the refrigerant, now a low pressure vapor, goesthrough the liquid line to the expansion valve. through the suction line back to compressor, where the cycle is repeated.The thermostatic expansion valve meters liquidrefrigerant into the evaporator, the volume of liquidrefrigerant depending upon the temperature of theevaporator; warmer evaporators get morerefrigerant and colder evaporators get less.LIQUID LINE REFRIGERATION SUCTION LINE SCHEMATIC EVAPORATOR DISCHARGE LINE COMPRESSOR THERMOSTATIC EXPANSION VALVECONDENSER March 2000 Page 15

NDE554 & NDE654OPERATION: Ice VendingWhen the ice dispensing glass fillerlever is pushed, an electrical circuitis made the dispense drive motorwhich turns, rotating thedispensing vane.When the dispensing vane sweepsthe ice over the ice dispensingchute ice is released from the bin.Ice will continue to discharge outthis chute as long as the vane isturning. It stops when thedispensing vane stops. ICE CHUTE Ice DispensingVEND SWITCH Vane BIN BOTTOM DRIVE MOTORGLASS FILLER LEVERSINK March 2000 Page 16

NDE554 & NDE654CLEANING and SANITIZINGA Scotsman Ice System represents a sizable investment of time and money in any company’s business. Inorder 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 alwayspreferable, 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 failure. The following isa list of recommended maintenance that will help keep the machine running with a minimum ofproblems.Maintenance and Cleaning should be scheduled at a minimum of twice per year.Sanitizing of the ice storage bin should be scheduled for a minimum of 4 times a year.Electrical power will be ON when doing in place 9. As the ice maker begins to use water from thecleaning. reservoir, continue to add more cleaning solution to maintain a full reservoir.ICEMAKING SYSTEM: In place cleaning 10. After all of the cleaning solution has been added to the reservoir, and the reservoir is nearly1. Check and clean any water treatment devices, if empty, switch the master switch to OFF.any are installed. 11. After draining the reservoir, as in step 6, wash and rinse the water reservoir.2. Remove screws and remove the upper front To Sanitize:panel. Repeat steps 8-11, only use an approved sanitizing solution in place of the cleaning solution.3. Move the ON-OFF switch to OFF. A possible sanitizing solution to use could be 1 ounce of household bleach mixed with 2 gallons of4. Remove the cover to the ice storage bin, and warm (95oF. - 115oF.) water.remove the ice. 12. Remove the block from the float in the water reservoir.5. Remove the cover to the water reservoir and 13. Switch the master switch to ONblock the float up. 14. Continue ice making for at least 15 minutes, to flush out any cleaning solution. Check ice for acid6. Drain the water reservoir and freezer assembly taste - continue icemaking until ice tastes sweet.using the drain tube attached to the freezer waterinlet. Return the drain tube to its normal upright DO NOT USE any ice produced from theposition and replace the end cap. cleaning solution. Be sure no ice remains in the bin.7. Prepare the cleaning solution: Mix eight ouncesof Scotsman Ice Machine Cleaner with three quarts 15. Remove all ice from the storage bin.of hot water. The water should be between 90-115 16. Add warm water to the ice storage bin anddegrees F. thoroughly wash and rinse all surfaces within the bin. Scotsman Ice Machine 17. Sanitize the bin cover, dispensing vane, bin Cleaner contains acids. bottom, and interior with an approved sanitizer using the directions for that sanitizer. These compounds may 18. Replace the ice storage bin cover, and the front cause burns. If swallowed, panel. DO NOT induce vomiting. Give large amounts of water or milk. Call Physician immediately. In case of external contact, flush with water. Keep out of the reach of children.8. Slowly pour the cleaning solution into the waterreservoir until it is full. Wait 15 minutes, thenswitch the master switch to ON. March 2000 Page 17

NDE554 & NDE654 2. The ice machine senses water level by a probe located in the water reservoir. At least twice a year,SENSOR MAINTENANCE the probe should be removed from the reservoir, and the tip wiped clean of mineral build-up. Moving Parts Hazard. Disconnect electrical power to the icemaker - dispenser before beginning.1. The bin control uses devices that sense light,therefore they must be kept clean enough so thatthey can “see”. At least twice a year, remove thebin control sensors from the grommets in the icechute, and wipe them clean.BIN CONTROL BIN CONTROL SENSOR SENSOR BIN TOP Clean the Probe's Tip with ice machine cleaner and a clean, soft cloth. 3. Air Cooled Models: Check the air cooled condenser for lint, dirt or grease build-up. Clean with vacuum or soft brush until light can be seen thru the fins. March 2000 Page 18

BEARING MAINTENANCE NDE554 & NDE654The bearing in the breaker should also be checked ·unscrewing the auger studat least two times per year.A. Check the bearing by: Auger Stud ·removing the ice chute cover Chute Cover Cap Screw·unscrewing the ice sweep Inspect the bearing. There should be plenty of grease in sight. If grease is needed the bearing Ice Sweep 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 allen head cap screws and pull the breaker off the auger and evaporator. If the bearing only needs grease, inject grease into the bearing using Scotsman grease needle pn 02-3559-01 and Scotsman bearing grease cartridge, pn A36808-001. Be sure to inject grease evenly and thoroughly. Bearing Needle, pn 02-3559-01·removing the water shed & unscrewing the breaker cover (left hand threads). Breaker CoverOff See Removal and Replacement section to replace bearing or seals. Reverse to reassemble. March 2000 Page 19

NDE554 & NDE654 ALLEN HEADAUGER MAINTENANCE SCREWSIn some areas, the water supply to the ice maker BREAKERwill contain a high concentration of minerals, and AND AUGERthat will result in an evaporator and auger ASSEMBLYbecoming coated with these minerals, requiring amore frequent removal than twice per year. If indoubt about the condition of the evaporator andauger, the auger can be removed so the parts canbe inspected.Note: Water filters can filter out suspended solids,but not dissolved solids. “Soft” water may not bethe complete answer. Check with a watertreatment specialist regarding water treatment.For more information on removal of theseparts, see REMOVAL AND REPLACEMENT.1. To remove the auger, remove the front and toppanels.2. Push bail clamp off of cover and remove cover.3. Unscrew and remove ice sweep.4. Remove ice chute from evaporator.5. Remove 4 allen screws holding breaker toevaporator.6. Pull up to remove auger.After the auger has been removed, allow the augerto dry: if the auger is not bright and shiny, it mustbe cleaned.Clean the auger and evaporator as required. DONOT HONE THE EVAPORATOR.7. Replace the water seal.8. Reverse to reassemble.March 2000 Page 20

NDE554 & NDE654SERVICE DIAGNOSIS:Symptom Possible Cause Probable CorrectionNo ice is made, nothing operates Unit off due to no power Restore PowerNo ice, auger motor is turning Unit off due to master switch in OFF Switch master switch to ON. position. Unit off due to low water level. Check water supply, filter, strainer, float valve. Correct water supply. Unit off due to ice level sensors Check/clean ice level sensors. (photo-electric eyes) blocked. Unit off due to scale on water level Clean water level sensor. sensor. Unit off due to high pressure control Check for water interruption (water open. cooled) or fan motor failure (air cooled). Auger motor hums but does not Auger can’t turn. Circuit board has turn. not yet shut unit down. Unit is shut down Circuit board has shut ice machine down due to high auger motor amp draw. Check for cause of high amp draw, including bearings, gearmotor condition and scale on auger and in evaporator. Low pressure control open Auger not turning due to: motor failure; auger relay failure on circuit board; or gears stripped. Check drive train. TXV restricted or not metering. Check bulb temperature. Lack of refrigerant. Check for leak. Check for a restricted system No power to circuit board. Check harness Low or hi pressure cut outs open Circuit Board gear motor relay will Check, replace board not close Water level or ice level sensor Check, replace sensor failed. Compressor contactor coil is open Check/replace contactor Compressor will not start Check start capacitor. Check start relay Check compressor windings Circuit board compressor relay will Check, replace board not close. March 2000 Page 21

NDE554 & NDE654SERVICE DIAGNOSISSymptom Possible Cause Probable CorrectionWater Leak Drain plugged up Clean out drain Tubing cracked Replace tubingExcessive water use Condensation on drain tubing Insulate tubing Hose off Reattach hoseExcessive ice meltage Reservoir cover off Return cover to reservoirMachine makes too much noise Reservoir cracked Replace reservoirDoes not dispense Evaporator water seal leaks Check base of evaporator & drip pan. If the seal leaks, shut off the Water cooled model, water water, remove the auger, replace regulating valve not adjusted the water seal. Check gear motor properly. for water infiltration. Reservoir float valve leaks thru Adjust to 245 PSIG discharge Water cooled model, overcharged pressure with refrigerant Water cooled model, condenser Replace float valve or seat coated with minerals Recover and weigh refrigerant. Bin drain clogged Weigh in correct charge. Improper installation of drains, they Acid clean water cooled condenser. are connected. Poor fit between bin door and door Clean out bin drain. frame Drains must be separate. Evaporator coated internally with minerals Adjust or replace Motor bearings dry Vend switch does not close Clean with Scotsman Ice Machine No ice in bin Cleaner Oil or replace motor Ice not flowing out of bin Check / replace switch Check bin, check ice machine section Check vane for proper rotation Check inner bin bottom Bin walls have scale on them, remove scale March 2000 Page 22

NDE554 & NDE654CONTROL SYSTEM DIAGNOSTICSThe control system consists of: If it is on, the ice sensors may be blocked. Remove them and check for mineral scale. Scotsman's test ·Control Board box can also be used to determine if the ice sensors or board are defective. ·Water Sensor Using the tester: ·Ice Sensors A. Disconnect the ice sensors at the connection by ·High Pressure Cut Out the ice chute. Connect the LED and PHOTO TRANS wires to the control board's wires. ·Low Pressure Cut Out B. With the On - Off (mode) switch in eitherIf the unit is OFF, check the control board: position, move the Bin Full switch on the tester to Bin Full - the tester's light will blink and after a few1. Is the Power OK light on? If not check power to seconds the bin full light on the control board willthe unit. If it has power, and the Power OK light is come on. If not, replace the board.NOT on, check the high pressure and low pressurecut outs. If they are both closed, replace the board. Move the Bin switch on the tester to Bin Empty.If the Power OK light is ON, go to the next step. The light on the tester will go out, and after a few seconds the Bin Full light on the board will go out.2. Is the Water OK light on? If it is, go to the next If master switch is ON, the unit should start.step. If not, check the water level in the reservoir. Ifthere is water in the reservoir, check that the water 4. High pressure cut out check.sensor is plugged in. To check the water sensor: Disconnect electrical power.A. Unplug water sensor. Pull the wires off the high pressure cut out.B. Pull water sensor from reservoir. Use an ohmmeter to determine if the switch isC. Place one ohmmeter lead on the sensor's plug OPEN, If it is, check the discharge pressure. If theand the other on the sensor's tip. The meter should discharge pressure is less than 300 PSIG, replaceshow nearly zero resistance. If it reads infinite the high pressure cut out.resistance, check the tip for corrosion. If it is cleanand still reads open, replace the sensor. If the high pressure cut out is open and the system has high discharge pressure, check for the cause.OR connect a copper wire to the wire where thewater sensor plugs into and place the other end in 5. Low pressure cut out check.the water. The water OK light should go ON. If itdoes not, replace the control board. Disconnect electrical power.3. Ice sensor check. Is the Bin Full light Off? If it is Pull the wires off the low pressure cut out.OFF and the Service light is Off, and the unit is notrunning, replace the control board. Use an ohmmeter to determine if the switch is OPEN, If it is, check the suction pressure. If theIf it is OFF and the auger motor is running but the suction pressure is greater than 35 PSIG, replacecompressor is not, check the compressor contactor the low pressure cut out.coil. If the low pressure cut out is open and the system has low suction pressure, check for the cause.March 2000 Page 23

NDE554 & NDE654 FLOAT Water ASSEMBLY SensorREMOVAL AND REPLACEMENTWATER RESERVOIR1. Shut off the water supply to the icemaker.2. Remove front panel and reservoir cover.3. Disconnect inlet water line from valve.4. To remove just the float, push the locking tab atthe back of the valve mounting block in and lift thevalve and block up and out of the reservoir tank.Note: inside the valve, there is a plunger whichmay be replaced separately, if desired.5. To remove reservoir, remove drain hose fromreservoir.6. Remove evaporator inlet hose from reservoir.7. Remove mounting screws from reservoirbracket, and remove reservoir from icemaker.8. Reverse to reassemble. BIN CONTROLS LOCKINGGROMMETS TABS BIN CONTROLS (Ice Level Sensors) 1. Disconnect electrical power. 2. Remove front panel. 3. Remove control box cover. 4. Locate bin top, in front of and behind it are two rubber bin control grommets. 5. Pull each bin control out, and in the control box, disconnect the electrical leads connecting the bin control to the circuit board. 6. Reverse to reassemble, be certain that the bin controls are aligned so that the ice level sensors are visible (centered) through the holes in the ice chute. BIN TOP March 2000 Page 24

NDE554 & NDE654REMOVAL AND REPLACEMENT: Bearing And BreakerNote: Removal of the auger, water seal, evaporator d. Lift up, and remove breaker/bearing assemblyand gearmotor must begin at the top of the from auger & evaporator.assembly. 6. Service the bearing. Check for rust, rough spots and damage. Moving Parts Hazard. a. The bearing is pressed into the breaker, to remove the bearing and replace it an arbor press is Disconnect electrical needed. power to the icemaker - b. Replace lower seals before installing new dispenser before bearing in breaker. beginning. Note: seals must be pressed in with a tool pushing against the outer edge only, they will not install byTo Remove the Breaker Bearing Assembly: hand. Replace parts as required. Re-grease bearing with1. Remove panels and disconnect electrical power. Scotsman part number A36808-001 bearing grease. Replace top seal, and check the o-rings,2. Move bail clamp back and remove ice chute replace if cut or torn.cover. 7. Reverse to reassemble: specific tools and materials are required to install properly.3. Unscrew and remove ice sweep. a. Add food grade grease such as Scotsman part number 19-0569-01 to the seal area before4. Remove insulation halves from outside of ice installing on the auger.chute, lift up and remove ice chute. b. Check the seal to shaft areas for cuts, or rough spots: none are permitted.5. The breaker may be removed from the augerand evaporator without disturbing the auger. Steps 5c - 6a. Unscrew breaker cover from breaker (left handthreads)b. Unscrew auger stud from top of auger.c. Unscrew 4 allen head cap screws holdingbreaker to evaporator.Steps 3 - 5a Step 5 b ICE BEARING SWEEP BREAKER AUGER STUD BREAKER March 2000 Page 25

NDE554 & NDE654 e. If the auger is stuck use a slide hammer type puller to pull on the auger at the threaded hole.REMOVAL AND REPLACEMENT The size of that hole is 5/8\"-18. Inspect the auger, the critical areas of the augerTo Remove the Auger: are:Turn off the water to the machine, and unclip the 1. The auger body. It should be clean andevaporator drain hose, pull it down and drain the shining. Sometimes an auger will appear cleanevaporator into the bin or a container. when wet, but after it is dry it will be seen to be stained. Scrub the auger with ice machine cleaner Moving Parts Hazard. and hot water. Disconnect electrical power to the icemaker - Ice machine cleaner is an acid. Handle it with dispenser before extreme care, keep out of the reach of children. beginning. 2. The water seal area. Because the auger has1. The top panel must be removed. been removed, the water seal will have to be2. Remove ice chute cover. replaced. Remove the water seal top half from the3. Unscrew ice sweep. auger, and inspect the auger for minerals clean as4. Remove ice chute body. required.5. The auger and breaker/bearing may now beremoved as an assembly. SLIDE HAMMERa. Unscrew 4 allen head cap screws holding PULLERbreaker to evaporator.b. Lift up on breaker and remove auger fromevaporator.Note: If the auger is stuck, the breaker must beremoved from the auger.The breaker may be removed from the auger andevaporator without disturbing the auger.a. Unscrew breaker cover from breaker (left handthreads)b. Unscrew auger stud from top of auger.c. Unscrew 4 allen head cap screws holdingbreaker to evaporator.d. Lift up & remove breaker from evaporator. BREAKER AND AUGER ASSEMBLYMarch 2000 Page 26

NDE554 & NDE654REMOVAL AND REPLACEMENT: Water SealTo Remove the Water Seal: 19-0529-01) on the area of the auger where the water seal is to be mounted.(Assuming all steps to remove the auger have 5. Carefully push the water seal (rubber sidebeen performed.) against the auger shoulder and the silastic.)1. The gearmotor/evaporator assembly will have to Do not get any silastic onto the face of the seal.be exposed. (See illustration - next page) 6. Allow the auger and seal to air dry until the2. Remove the 4 hex head cap screws holding the silastic is dry on the surface.evaporator to the gearmotor assembly. Lift theevaporator up and off of the gearmotor.3. Remove the snap ring or wire retainer from thegrove under the water seal.4. Pull or drive out the lower half of the water seal.To Replace the Water Seal:1. Lubricate the water seal with water, and pushthe water seal into the bottom of the evaporatorslightly past the grove for the snap ring. WATER FOOD GRADERETAINING SILASTIC SEALANT HERE 7. If the original water seal was leaking, it would be a good idea to inspect the interior of the gearmotor.2. Replace the snap ring and pull the water sealdown against it.3. The part of the water seal that rotates with theauger must also be replaced. Remove the old partfrom the auger and clean the mounting area.4. Place a small bead of food grade silastic sealant(such as 732 RTV or Scotsman part number March 2000 Page 27

NDE554 & NDE654 8. Install auger, breaker, breaker bearing assembly, and ice discharge chute in reverse orderREMOVAL AND REPLACEMENT of disassembly. To Reassemble the Evaporator and AugerTo Replace the Evaporator: 1. After the gearmotor has been inspected, fasten the evaporator to the gear motor, be sure that the(Assuming all the steps for removal of the thrust number of shims indicated on the gear case coverbearing, breaker, auger, and water seal have been is in place between the gearcase cover and theperformed.) drip pan gasket. Torque the bolts to 110 inch pounds.1. Discharge the refrigerant from the ice maker. 2. Lower the auger into the evaporator barrel, slightly turning it to match up with the drive end. Do2. Unsweat the refrigerant connections: Not Drop Into the Evaporator. 3. Complete the reassembly by reversing thea) At the thermostatic expansion valve outlet. disassembly for the breaker & thrust bearing assembly.Heat sink the TXV body when unsweating orresweating the adjacent tubing. MOVE THE GEARMOTOR -b) At the suction line at the joint about 3\" from the EVAPORATORevaporator.3. Remove the evaporator.4. Unsweat the drier from the liquid line.5. After installing a new water seal in the newevaporator (see “To Replace the Water Seal”)sweat in the new evaporator at the old tubingconnections.6. Install an new drier in the liquid line.7. Evacuate the system until dehydrated, thenweigh in the nameplate charge. Check for leaks.For Access to the Evaporator to CONTROLGearmotor bolts: BOX1. Remove upper front and top panels. SCREWS2. Remove screws holding control boxassembly to the cabinet, move the controlbox out of the way, temporarily secure tocabinet.3. Remove the upper half of the ice chute.4. Remove the ice sweep.5. Remove the lower half of the ice chute.6. Remove the 2 screws securing the frontportion of the gearmotor support to thecabinet7. Move the the gearmotor - evaporator tothe right: space is now available forremoval of the evaporator and gearmotorbolts. When reassembling, reverse theabove steps. March 2000 Page 28

NDE554 & NDE654TO REMOVE AND REPAIR THE GEARMOTOR ASSEMBLY(Assuming that the procedures through removal of If there is evidence of water in the oil (rustythe water seal have been performed.) bearings and gears; the oil having a creamy white appearance; oil level too high) carefully inspect the Electrical Shock Hazard. bearings and gears. If in doubt about the condition of a part, replace it. The oil quantity is 14 fluid Disconnect electrical ounces, do not overfill. power to the icemaker - Note: The gears and bearings are available only as dispenser before pressed together sets. beginning. D) After replacing parts as required, (if any) reassemble the gearcase. The two smaller gearsTo Check the Motor: and the oil should be in the lower case, the output gear will be with the cover. As you lower the cover1. Remove wires from terminals 1 and 2. onto the lower case, cover will have to be moved closer to the second gear after the output gear has2. Use an ohmmeter to check for continuity. If there cleared the second gear top bearing. E) After the case is together, and the locating pinsis none, replace the motor only. If there is are secure in both ends, replace all cap screws. 4. Bench test the gearmotor, check for oil leaks,continuity but the motor will not start, check the noise, and amp draw.motor's start switch. ROTOR BEARING3. Remove motor end bell or motor stator. FIRST GEAR &With ohmmeter wires attached to 1 and 2 BEARINGSmove centrifugal switch actuator up and GASKETdown to simulate motor rotation. If theohmmeter does not show any change,replace the switch or motor. If theohmmeter shows an open circuit, replacethe switch or motor. GEARCASETo Replace: COVER1. Remove the electrical wires from thegear drive motor.2. Unscrew the 4 cap screws holding thegearmotor to the gearmotor plate.3. Remove the gearmotor from theicemaker.To Inspect the gearmotor.A) Remove the cap screws holding thegearmotor case halves together and pry thetwo cases apart.B) To lift off the cover, lift up until you canfeel internal contact, then pull the covertowards the output gear end, and then liftthe cover (with drive motor attached) upand away from the gear motor case.Note: The case cover output gear,bearings, and shaft are one pressedtogether assembly. Replace as a unit.C) Inspect the oil, gears, and bearings. Ifthe oil level and condition is acceptable,quickly check the gears and bearings. Theyare likely to be fine if the oil is. March 2000 Page 29

NDE554 & NDE654REFRIGERATION SERVICEGeneral: This ice machine uses R-404A refrigerant Instructions for Liquid Charging R-404Aand polyolester oil. Do NOT use mineral oil in this In preparation for charging, the low side hoserefrigeration system. should have a sight glass, and/or a restricting device (such as a “Charge Faster”) installed in it for ·When the system is serviced, a special liquid metering liquid into the low side of the system. line drier is required. It is included with 1. After a thorough evacuation shut off the manifold replacement compressors. valves and switch off the vacuum pump. ·R-404A is not compatible with mineral oil so 2. Place a drum of R-404A onto an electronic scale. these ice machines use Polyolester oil. Polyolester oil absorbs water very easily. A 3. Attach the charging hose to the drum. system opened for service must be re-sealed as soon as possible (15 minutes maximum). 4. Open the valve on the drum and purge the charging hose. ·Special leak detection equipment is required to 5. Zero out the scale. locate small refrigerant leaks. Usually a leak detector capable of detecting a Halongenated 6. Shut the low side access valve at the ice refrigerant or HFC-134a will work. Check with machine. the leak detector manufacturer if in doubt. 7. Open the discharge manifold valve full open. ·Evacuate to 300 microns. 8. Watch the scale, when the correct charge is ·Liquid charge the system shown, shut the manifold valve. Note: If all of the charge will not “go in” theAccess Valves: To use the discharge side:access valves: A. Shut the discharge access valve at the ice·Remove the cap from the machine. stem, use a 3/16\" allen B. Switch the machine on. wrench to check that the valve is CLOSED. The C. Open the low side access valve at the ice remove the core cap. Torque stem machine.·Close the valve and w to 6-8 ft.-lb., caps to 7-12 D. Open the low side manifold valve and observe replace the caps the sight glass to be certain that only gas is flowing hen done. ft.-lb. into the system. The valve E. When the proper charge is indicated on the scale, shut off the manifold valve(s). 9. Shut off the valve on the refrigerant drum. 10. Re-open the manifold valves until all liquid has R-404A flowed out of the hoses. Tank Must 11. Shut the low side access valve on the ice Be in Liquid machine.Sight Glass Dispensing 12. Remove hoses from ice machine and replace Position - all caps. Check Tank! SCALEHose Connection Schematic for Liquid Charging March 2000 Page 30