Scotsman NU130 Manual
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Scotsman NU130 Manual

Scotsman NU130 Manual

Nugget ice machine
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NU130
Nugget Ice Machine

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Summary of Contents for Scotsman NU130

  • Page 1 NU130 Nugget Ice Machine...
  • Page 2 NU130 Cabinet • 15 inch wide cabinet • Air cooled only • Can be built in – air in and out the front • Service panel on side • Stainless Steel • Listed for outdoor use...
  • Page 3 Components • Compared to cube • But it does have: ice machines: – Continuous flow, steady state – No spray pump system – No spray jets – Auger – No hot gas valve – Gear reducer – No inlet water –...
  • Page 4 In the Bin Dataplate Bin Level Sensor Ice Outlet Chute...
  • Page 5 In the Bin Condensate Drain Hose Scoop Holder Drain...
  • Page 6 Cabinet • Air in and out the front • Front Service Panel • Kickplate – Access to condenser...
  • Page 7 Side Service Panel Provides access to bin drain, drain pump (when used), fan motor and compressor.
  • Page 8 Reverse Door Swing • Remove top pin – Lift door off bottom pin • Remove hole plugs • Switch hinges top to bottom & side to side • Install hole plugs • Reattach door...

  • Page 9: Installation

    Installation • Power – 115 volt model with power cord • Water – ¼” OD copper tube on back, compression fitting ships in attached bag • Drain – Gravity model – Pump model or kit (A39462-021)
  • Page 10 Electrical • 115 volt, 60 Hz power • Unit must be on separate 15 amp circuit • Outlet should be accessible or must use circuit breaker to shut off power during service • No extension cords permitted...
  • Page 11 Water Supply Connection • Connection on back • Compression fitting shipped with unit • 20 to 80 lb pressure • Coil inlet tubing to this fitting when unit built in • Back flow prevention is by air gap at the float valve...
  • Page 12 Drain • Gravity • Drain Pump – Connect to hose – Hose pre-connected inside cabinet – Route to drain – Drain tubing must not – Maintain code air trap water gaps – Vent and use rigid – Pump will activate tubing outside of when water backs cabinet...

  • Page 13: Control Panel

    Control Panel Check Water Light Clean- On/Off Reset Status Light Time-to-Clean Indictor Light...
  • Page 14 Initial Start Up • Connect power • Compressor, Fan Motor and Auger – Panel lights blink and go out Drive Motor operate • Turn on water • In about 10 minutes supply ice will begin to fall • Push On-Off button into the bin –...
  • Page 15 Control Panel – Ice Making Mode • Green Ice Making Light – Indicates ready to make ice – Does not indicate operation, bin full or empty...
  • Page 16 Control Panel – Check Water • Red Light – Indicates Lack of Water to Machine – No ice will be made while light is on – Restarts automatically when water restored...
  • Page 17 Control Panel – Time to Clean • Yellow Light – On after 6 months of power up time – Indicates the machine needs to be cleaned • Scale removed • Condenser cleaned • Unit sanitized...
  • Page 18 Ice Making Components • Evaporator – Vertical stainless steel, refrigerated tube – Refrigeration coil wrapped on outside of tube – 12 internal grooves • Guide ice vertically...
  • Page 19 Ice Making Components • Auger – Double-spiral, solid stainless steel auger Water Seal...
  • Page 20 Ice Making Components • Breaker Head – Combination extruding head and bearing retainer...
  • Page 21 Ice Making Components • Gear Reducer – Auger drive motor drives auger at 11 RPM CCW – Auger engaged by fitting into hollow output shaft • Square Drive...
  • Page 22 Top of Gear Reducer • Hollow shaft – Water shed rotates with shaft • Condensation relief slots – Mounting shelf acts as drain pan • No vent Water Shed...

  • Page 23: Control System

    Control System • Transformer - 12 volt secondary • Controller – Operates auger motor and compressor/fan motor – Connected to water and ice sensors • Control Panel – has lights and switches • Water Level Sensor – water conductivity • Ice Level Sensor - ultrasonic...

  • Page 24: Control Box

    Control Box Bin Control Bin Control High Voltage Transducer Connection Connection Water Level 12 v Transformer 12 v Power Supply Control Panel Sensor Connection Connection Connection...

  • Page 25: Bin Sensor

    Bin Sensor • Ultrasonic System – Emits high frequency sound – Controller measures time to return signal – Time tells controller the distance from sensor to ice • More time = lower ice level • Either on or off, not adjustable...

  • Page 26: Water Reservoir

    Water Reservoir Valve Water Level Sensor Float Bulb Valve Lever...

  • Page 27: Refrigeration System

    Refrigeration System • R-134a – 4.5 oz charge • Cap tube metering device • Steady-state operation – System pressures steady while making ice – No access valves, do not attach long hoses...
  • Page 28 How It Works – Refrigeration Schematic Suction Line / Heat Exchanger Condenser Evaporator Compressor Liquid Line Gear Reducer Capillary Tube...
  • Page 29 How it Works – Water Schematic Water Level Sensor Water Inlet Water Level Outlet to Evaporator Drain...
  • Page 30 Components Assembled Mounting Shelf...
  • Page 31 Evaporator to Gear Reducer Adapter Evaporator to Gear Reducer Fasteners Condensation Relief Slot Gear Reducer...
  • Page 32 Output Shaft Area Water Shed Output Shaft...
  • Page 33 Auger Engagement Adapter Shown without adapter...
  • Page 34 Normal Full Bin Ice Level...

  • Page 35: Maintenance

    Maintenance • Air cooled condenser – Remove service panel – Remove kickplate – Vacuum condenser...
  • Page 36 Maintenance – Scale Removal • Hard water scale will form on the ice making surfaces – Reduces capacity – Increases loads – Increases noise • Scale is commonly limestone – Must be dissolved by food grade acid • Ice machine scale remover...

  • Page 37: Scale Removal

    Scale Removal • Begin – Shut machine off – Remove ice – Remove back panel of bin • Two thumbscrews...
  • Page 38 Scale Removal - 2 • Locate water reservoir • Push tab and remove cover...
  • Page 39 Scale Removal - 3 • Push Blue Float Valve On/Off Lever Up – Shuts water off...
  • Page 40 Scale Removal - 4 • Pull drain plug and drain water system • Return drain plug...
  • Page 41 • Prepare scale remover solution – Need 16 ounces of solution – Will need squirt bottle for built in situations – Squirt bottle available premixed – 19-0664-01 – Mix Scotsman Clear 1 Scale remover with water • Ratio: 2.5 ounces to 32 ounces water...
  • Page 42 Scale Removal - 6 • Add scale remover solution to water reservoir until it is full – About 8 ounces...
  • Page 43 Scale Removal - 7 • Push and Hold BOTH On/Off and Clean buttons for 5 seconds...
  • Page 44 Scale Removal - 8 • Only the Auger motor operates for 10 minutes • Compressor turns on, ice is made for 40 minutes – Must be present to add scale remover solution while unit is making ice – After all 16 ounces of solution is used up, push the Float Valve On/Off lever Down to switch the water back on...
  • Page 45 Scale Removal - Finish • After machine shuts off – Shut water off – Drain water system – Re-plug drain – Switch water back on – Rinse bin drain – Wipe up loose scale from gear reducer – Return bin back panel •...
  • Page 46 Top Bearing Check Check for Gap .015 Pin Gage Pin must not slide between auger shaft and inside of bearing.
  • Page 47 Diagnostics – Simple to Complex • No Ice – no response at control panel – Check power to transformer primary...
  • Page 48 No Power to Transformer • Power Disconnected • Pump model – open safety pressure switch – Water in bin, pump or drain failure – No water in bin, switch failure...
  • Page 49 No Ice – no control panel response • Power to transformer OK – Check secondary for 12 volts AC – If OK check control panel • Unplug ribbon cable at J6 and check switches • (Dot is pin 1), Pin 2-3 On/Off Switch;...
  • Page 50 No Ice – no control panel response • Control Panel OK • Check power to controller – 12 volts to connection – If OK, switch power on and off, if still no response, replace controller...
  • Page 51 No Ice – no water light is ON • Check water supply • Check float valve • Check water level sensor...
  • Page 52 No Ice – Water Check • Is float down and no water? – If yes and water is not flowing in, valve is plugged or not working – If no, is shut off lever up? – If float is up and shut off lever is down, valve is not working...
  • Page 53 No Ice – Water Check Check Water Light is On, but the reservoir has water – Water is too clean • Must be 10 microSiemens/cm or more of conductivity – Water sensor wire disconnected – Controller cannot read sensor...
  • Page 54 No Ice – No Water Light is ON • Water Sensor Check – Unplug sensor at J7 – Short center and right pins together – Light should go out...
  • Page 55 No Ice – Ice Making Light is ON • Two minute delay after power reset • Or in restart window – 60 second restart attempt time • Wait or reset controller to check – Press Off/On to stop and again to start –...
  • Page 56 No Ice – Ice Making Light is ON • Bin Control Check – Locate J2 (bin stat) – Short pins together • Unit should start • If yes, replace bin control sensor • If no, replace controller...
  • Page 57 No Ice – Ice Making Light is ON • Refrigeration System Check – Compressor and Fan motor both off but Auger motor is operating. Check for voltage (Bk/W) – at controller, controller’s compressor relay may have failed – Fan blade not turning – check for free action of fan blade, check motor windings –...
  • Page 58 No Ice – Ice Making Light is ON • Auger motor, Compressor and Fan are operating, ice sweep is turning, condenser is clean. – Possible refrigerant leak – Possible compressor valve failure • Add temporary access valve to process tube of compressor to check suction pressure –...
  • Page 59 No Ice – 3 Lights Blinking • Auger Motor Over 1 Amp – Normal is .5 to .6 amps – Lights will blink once every 2 seconds – 4 minutes to restart • Auger Motor Low or No Amp Draw –...

  • Page 60: Repair Procedures

    Repair Procedures • Top panel access is required for many components, including: – Gear reducer, auger, breaker, water seal, reservoir, controller, transformer, bin control – Shut off and Drain water from evaporator prior to service of any part of it...

  • Page 61: Removal And Replacement

    Removal and Replacement Ice Sweep • Ice making components – Begin with the ice sweep – Rotate CCW to remove...
  • Page 62 Removal and Replacement Ice Chute • Remove back panel of bin • Lift ice chute up and off evaporator...
  • Page 63 Removal and Replacement • Remove 4 allen head bolts and lift breaker off evaporator...
  • Page 64 Removal and Replacement • Breaker & Bearing Bearing – Bearing is non- metallic and does not require any lubrication – Bearing can be replaced by driving it out and pushing another in Breaker w/out bearing...
  • Page 65 Removal and Replacement • Lift auger out of evaporator • Disconnect drain hose from evaporator...
  • Page 66 Removing Stuck Auger 5/16-18 Hex cap screw Flat Washer Spacer Shim breaker, tighten cap screw to lift auger Shim with hex nuts...
  • Page 67 Removal and Replacement Suggest using 16” Screwdriver • Separate Evaporator from Gear Reducer – Disconnect electrical harness from auger motor – Remove 4 phillips screws holding gear reducer mounting plate to shelf...
  • Page 68 Removal and Replacement • CAREFULLY lift gear reducer & evaporator up • Rest on back wall • Remove 4 allen head screws holding evaporator to adapter...
  • Page 69 Removal and Replacement • Separate Evaporator from Gear Reducer • Remove water seal from evaporator Water Seal...
  • Page 70 Removal and Replacement Mating Sealing Surfaces • Water Seal Rotating Half Stationary Half...
  • Page 71 Removal and Replacement • Water Seal – Rotating Half on Auger – Remove seal ring – Clean auger – Add sealant to auger – Install new seal • Rubber side up • Wet rubber • Push onto auger • Do NOT touch mating surfaces...
  • Page 72 Removal and Replacement • Water Seal – Stationary Half – Wet outside edge – Push into evaporator tube – Stop when flush with end of tube • Adapter will push seal to proper depth (as shown)
  • Page 73 Removal and Replacement • IF replacing gear reducer, be sure not to overtighten mounting bolts...
  • Page 74 Removal and Replacement • Place evaporator tube onto gear reducer – Adapter will position water seal to correct depth – Secure with the original 4 allen head screws – Reattach assembly to shelf – Install auger into evaporator tube – Reattach breaker to top of evaporator...
  • Page 75 Removal and Replacement • Compressor Access – Remove side service panel, front service panel and kickplate. Remove back panel. – Remove screws under side service panel – Remove 2 screws at back bottom corners – Loosen 2 screws at front bottom corners –...
  • Page 76 Compressor Support Prop...
  • Page 77 Summary • NU130 is a continuous flow ice machine • Ice form is chewable Nugget • 15 inch cabinet • Air cooled • Pump or Gravity Drain • R-134a...

Table of Contents