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SCN60 Residential Nugget Ice Machine
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SCN60 Nugget Ice
• Nugget Ice– What it isn’t: Ice frozen in a mold– What it is: A chewable ice, formed continuously by forcing soft ice thru tapered holes.
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Components
• Compared to cube ice machines:– No spray pump– No spray jets– No hot gas valve– No inlet water solenoid valve
• But it does have:– Auger– Gear reducer– Float valve
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SCN60 Cabinet
• 15 inch wide cabinet• Can be built in – air in and out the front
• Service panel on side• Finishes
– Unfinished door• For decorator door
– Stainless door
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In the Bin
Ice Outlet Chute
LightBin Level Sensor
Dataplate
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In the Bin
Drain
Condensate Drain Hose
Scoop Holder
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Cabinet
• Air in and out the front
• Front Service Panel
• Kickplate– Access to condenser
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Side Service Panel
Provides access to bin drain, drain pump (when used), fan motor and compressor.
Side access panel now on ALL SC Models!!
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Reverse Door Swing
• Remove hinge covers• Loosen the screw on the keyhole slot, remove the other
• Pull door from unit• Switch hinges on door
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Reverse Door Swing• Remove top panel• Remove and replace top bracket
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Reverse Door Swing• Remove and replace lower door bracket– New brackets shipped loose inside the bin
– Hardware package includes opposite door hinge covers, 90 degree door stop pin & leveling leg caps
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Door Panel• Unfinished units are shipped without door covers– Use White, Black or Stainless Scotsman panel kits
• Panel kits include hole covers
– Make and attach a
Hole Cover
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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
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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
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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
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Drain
• Gravity– Connect to hose inside cabinet‐field supplied
– Drain tubing must not trap water
– Vent and use rigid tubing outside of cabinet
– Route and slope to drain
– Maintain code air gap
• Drain Pump– Hose pre‐connected– Route to drain– Maintain code air gaps– Pump will activate when water backs up into inlet hose
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Control Panel
Status Light-Green
Check Water Light-Red
Time-to-Clean Indictor Light-
Yellow
Clean-Reset
On/Off
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Initial Start Up• Connect power
– Panel lights blink• Turn on water supply
• Push On‐Off button– Ice making light switches ON
• Compressor, Fan Motor and Auger Drive Motor operate
• In about 10 minutes ice will begin to fall into the bin
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Control Panel –Ice Making Mode
• Green Light– Indicates ready to make ice– Does not indicate operation, bin full or empty
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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
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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
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Ice Making Components
• Evaporator– Stainless steel refrigerated tube with vertical riflings
– Refrigeration coil wrapped on outside of tube & foamed
Water inlet
Refrigeration inlet
Refrigeration outlet
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Ice Making Components
• Auger– Double‐flighted, solid stainless steel auger
Water Seal
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Ice Making Components
• Breaker Head– Combination extruding head and bearing retainer
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Ice Making Components
• Gear Reducer– Auger drive motor drives auger at 11 RPM CCW
– Auger engaged by fitting in hollow output shaft
• Square Drive
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Control System• Transformer ‐ 12 volt secondary• Controller
– Operates auger motor and compressor/fan motor
– Connected to door switch, water and ice sensors
– Operates door light• Control Panel – has lights and switches• Water Level Sensor – water conductivity • Ice Level Sensor ‐ ultrasonic
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Control Box
12 v Transformer
Bin Control Transducer
Bin Control Connection
12 v Power SupplyConnection
High Voltage Connection
Door SwitchConnection
Water LevelSensor Connection Control Panel
Connection
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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
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Water Reservoir
Water LevelSensor
On/Off Lever (used in cleaning process)
Mechanical Valve
Float Bulb
Normal Water levelOverflow
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Refrigeration System• R‐134a
–4.5 oz charge• Compressor, condenser same as SCC30• Cap tube metering device• Steady‐state operation
– System pressures steady while making ice
–No access valves, do not attach long hoses
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How It Works –Refrigeration Schematic
Condenser
Compressor
Capillary Tube
Evaporator
GearReducer
Liquid Line
Suction Line / Heat Exchanger
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How it Works –Water Schematic
Water Level
Water Inlet
Outlet to Evaporator
Drain
Water Level Sensor
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Machine Compartment
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Evaporator to Gear Reducer
Adapter
Gear Reducer
Evaporator toGear Reducer
Fasteners
CondensationRelief
Slot
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Output Shaft Area
Water Shed
Output Shaft
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Auger Engagement
Shown without adapter
Adapter
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Normal Full Bin Ice Level
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Maintenance
• Air cooled condenser –service frequently when pets are in the house– Remove service panel
– Remove kickplate– Vacuum condenser
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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
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Scale Removal
• Begin– Shut machine off– Remove back panel of bin
• Two thumbscrews
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Scale Removal ‐ 2
• Locate water reservoir
• Push tab and remove cover
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Scale Removal ‐ 3
• Push Float Valve On/Off Lever Up– Shuts water off
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Scale Removal ‐ 4
• Pull drain plug and drain water system
• Return drain plug
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Scale Removal ‐ 5• Prepare scale remover solution– Need 16 ounces of solution– Will need squirt bottle for built in situations
– Squirt bottle available premixed –19‐0664‐01
Or– Mix Scotsman Clear 1 Scale remover with water
• Ratio: 1.25 ounces to 16 ounces water
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Scale Removal ‐ 6
• Add scale remover solution to water reservoir until it is full– About 8 ounces
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Scale Removal ‐ 7
• Push and Hold BOTH On/Off and Clean buttons for 5 seconds‐Time to clean light will begin blinking
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Scale Removal ‐ 8
• Auger motor (only) 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
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Scale Removal ‐ Finish• After machine shuts off
– Shut water off– Drain water system– Re‐plug drain– Switch water back on– Replace float cover– Rinse bin drain– Wipe up loose scale from gear reducer– Return bin back panel
• Push in at bottom to snap in
– Switch unit back on
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Top Bearing Check
Check for Gap
.015 Pin Gage
Pin must not slidebetween auger shaft and
inside of bearing.
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Diagnostics – Simple to Complex• No Ice – no response at control panel– Check power to transformer primary
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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
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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; Pin 4‐3 Clean Reset Switch
– About 10 ohms when activating a button, and Open when not pressing a button
Pin 1
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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
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No Ice – no water light is ON• Check water supply• Check float valve• Check water level sensor
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No Ice – Water Check
• Is float down and no water?– If float is up and shut off lever is down, valve is not working
– If yes and water is not flowing in, valve is plugged or not working
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No Ice – Water Check
• No 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
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No Ice – No Water Light is ON
• Water Sensor Check– Unplug sensor at J7– Short pins 1 & 2 together
– Light should go out
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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
– If does not start, check bin control
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No Ice – Ice Making Light is ON
• Bin Control Check– Unplug connector at J9– Short the middle 2 pins together (green & white wires)
• Unit should start• If yes, replace bin control sensor
• If no, replace controller
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No Ice – Ice Making Light is ON
• Refrigeration System Check– Compressor and Fan motor both off but Auger motor is operating. Check for voltage – controller relay may have failed
– Fan blade not turning – check for free action of fan blade, check motor windings
– Compressor off – check starting components and compressor windings
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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 – MUST use short hose (6”) or charge will be affected.
• Suction pressure should be about 8 PSIG
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No Ice – 3 Lights Blinking• Auger Motor Over Amp
– Lights will blink once every 2 seconds– 4 minutes to restart
• Auger Motor Low or No Amps– Lights will blink twice every 2 seconds– 20 minutes to restart – motor cool down time
• Controller Failure– Lights will blink once every 10 seconds
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Repair Procedures• Top panel & machine compartment panel removal 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
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Removal and Replacement
• Ice making components– Begin with the ice sweep
– Rotate CCW to remove
Ice Sweep
![Page 65: SCN60 Residential Nugget Ice Machine Training/scn.pdf · the Float Valve On/Off lever Down to switch the water back on ... – 20 minutes to restart – motor cool down time ... •](https://reader034.vdocument.in/reader034/viewer/2022052001/601387af670c6726f7596c10/html5/thumbnails/65.jpg)
Removal and Replacement
• Lift ice chute up and off evaporator
Ice Chute
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Removal and Replacement
• Remove 4 allen head bolts and lift breaker off evaporator
![Page 67: SCN60 Residential Nugget Ice Machine Training/scn.pdf · the Float Valve On/Off lever Down to switch the water back on ... – 20 minutes to restart – motor cool down time ... •](https://reader034.vdocument.in/reader034/viewer/2022052001/601387af670c6726f7596c10/html5/thumbnails/67.jpg)
Removal and Replacement
• Breaker & Bearing– Bearing is non‐metallic and does not require any lubrication
– Bearing can be replaced by driving it out and pushing another in
Bearing
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Removal and Replacement
• Lift auger out of evaporator‐Be Careful extremely sharp edges!
• Disconnect drain hose from evaporator
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Removal and Replacement
• Separate Evaporator from Gear Reducer– Disconnect electrical harness from auger motor
– Remove 4 phillips screws holding gear reducer mounting plate to shelf
Suggest using 16” Screwdriver
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Removal and Replacement
• CAREFULLY lift gear reducer & evaporator up
• Rest on back wall• Remove 4 allen head screws holding evaporator to adapter
![Page 71: SCN60 Residential Nugget Ice Machine Training/scn.pdf · the Float Valve On/Off lever Down to switch the water back on ... – 20 minutes to restart – motor cool down time ... •](https://reader034.vdocument.in/reader034/viewer/2022052001/601387af670c6726f7596c10/html5/thumbnails/71.jpg)
Removal and Replacement
• Separate Evaporator from Gear Reducer
• Remove water seal from evaporator
Water Seal
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Removal and Replacement
• Water Seal
Stationary HalfRotating Half
Mating Sealing Surfaces
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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
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Removal and Replacement
• Water Seal –Stationary Half– Wet outside edge– Push into evaporator tube
– Stop when flush with end of tube
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Removal and Replacement
• IF replacing gear reducer, be sure not to overtighten mounting bolts
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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
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Summary
• SCN60 is a continuous flow ice machine
• Ice form is chewable Nugget• 15 inch cabinet• Air cooled• Pump or Gravity Drain• R‐134a
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