NU130 Nugget Ice Machine - | Scotsman Ice Systems Training/NU130 Service.pdf · No Ice – Ice...
Transcript of NU130 Nugget Ice Machine - | Scotsman Ice Systems Training/NU130 Service.pdf · No Ice – Ice...
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NU130Nugget Ice Machine
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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
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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– No Freeze or
Harvest Cycles
•But it does have:– Continuous flow,
steady state system
– Auger– Gear reducer– Float valve
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In the Bin
Ice Outlet Chute
Bin 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.
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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
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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 (A39462-021)
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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
•Back flow prevention is by air gap at the float valve
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Drain
•Gravity– Connect to hose
inside cabinet– 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
– Conversion kit available
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Control Panel
Status Light
Check Water Light
Time-to-Clean Indictor Light
Clean-Reset
On/Off
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Initial Start Up
•Connect power– Panel lights blink
and go out
•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 Ice Making 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– Vertical stainless steel,
refrigerated tube– Refrigeration coil wrapped
on outside of tube– 12 internal grooves
• Guide ice vertically
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Ice Making Components
•Auger– Double-spiral, 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 into
hollow output shaft• Square Drive
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Top of Gear Reducer
•Hollow shaft– Water shed
rotates with shaft
•Condensation relief slots
– Mounting shelf acts as drain pan
•No vent Water Shed
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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
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Control Box
12 v Transformer
Bin Control Transducer
Bin Control Connection
12 v Power SupplyConnection
High Voltage Connection
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
Valve Lever
Valve
Float Bulb
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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
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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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Components Assembled
Mounting Shelf
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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– 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
• Ice machine scale remover
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Scale Removal
•Begin– Shut machine off– Remove ice– 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 Blue 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
– 19-0664-01Or– Mix Scotsman Clear 1 Scale
remover with water• Ratio: 2.5 ounces to 32 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
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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
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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
• 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 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
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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
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No Ice – No Water Light is ON
•Water Sensor Check– Unplug sensor at J7– Short center and
right pins 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– Locate J2 (bin stat)– Short pins together
• 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 (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
– Compressor off – may have overheated if fan not turning. 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 -10 PSIG
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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– 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 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
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Removal and Replacement
• Ice making components
– Begin with the ice sweep
– Rotate CCW to remove
Ice Sweep
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Removal and Replacement
•Remove back panel of bin
•Lift ice chute up and off evaporator
Ice Chute
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Removal and Replacement
•Remove 4 allenhead bolts and lift breaker off evaporator
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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
Breaker w/out bearing
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Removal and Replacement
•Lift auger out of evaporator
•Disconnect drain hose from evaporator
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Removing Stuck Auger5/16-18 Hex cap screw
Flat Washer
Shim with hex nuts
Shim breaker, tighten cap screw to lift auger
Spacer
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Removal and Replacement
•Separate Evaporator from Gear Reducer
– Disconnect electrical harness from auger motor
– Remove 4 phillipsscrews 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 allenhead screws holding evaporator to adapter
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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• Adapter will push seal to
proper depth (as shown)
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Removal and Replacement
• IF replacing gear reducer, be sure not to overtightenmounting 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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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– Tip cabinet forward– Support with 11 inch prop
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Compressor
Support Prop
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Summary
•NU130 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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