SCE275: CM Technical Training Under-the-counter
Transcript of SCE275: CM Technical Training Under-the-counter
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Technical TrainingTechnical TrainingSCE275: CM3
Under-the-counter
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SCE275 Cube Ice Machine SCE275 Cube Ice Machine
• Individual Cubes• CM3 Controls• SCE170-type cabinet
– Two piece– Rust-free
• R-404A• Air or Water Cooled
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39”
30”1
430 ”
SCE275 Cabinet SizeSCE275 Cabinet Size
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Air Flows In and Out the FrontAir Flows In and Out the Front
Installation: LocationInstallation: Location
• May be Built In– Top– Both Sides
• Must use legs or casters– Better draining– Bottom not smooth
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Remove Shipping MaterialsRemove Shipping Materials
Installation: SetupInstallation: Setup
• Unpack– Remove shipping
materials– Locate Manual
• Follow Installation Instructions!
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Vent The DrainVent The Drain
Installation: UtilitiesInstallation: Utilities
• Unit is supplied with a power cord
• Water inlet and drain in recessed box on back– 3/8” male flare inlet– 3/4 ” FPT Drain– Install New Tubing
• Do Not Reuse Old
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InstallationInstallation
• Use a water filter– Keeps sediment out of the
inlet water valve– Filters with treatment
systems reduce scale formation
• If there is an existing filter - CHANGE THE CARTRIDGE!
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Installation: SetupInstallation: Setup
• Move the unit to its final location
• Level the unit, check at the reservoir– Storage bin drain is at
the front, do not tilt the machine to the back!
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Remove ScrewsRemove Screws
Push Grill Down Push Grill Down & Tilt Out& Tilt Out Locate Controller & Locate Controller &
Push FreezePush Freeze
Installation: Initial Start UpInstallation: Initial Start Up
Note: 2003 Controller Location Moved to Left Chassis WallNote: 2003 Controller Location Moved to Left Chassis Wall
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OperationOperation
• The initial freeze cycle begins– Water flows in– Must fill reservoir before
pump or compressor will start
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Float Stem
Water LevelSensor
Float
Pump and Water Sensor SystemPump and Water Sensor System
OperationOperation
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Water Temperature SensorWater Temperature Sensor
Reservoir Overflow StandpipeReservoir Overflow Standpipe
OperationOperation
• Water Temperature– Used to confirm system
operation– Used for diagnostics
• Standpipe– Rinse water overfills and
drains out thru standpipe– Height critical
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Freeze CycleFreeze Cycle
• 3 minutes into freeze– Discharge temperature measured– If less than 150oF., the fans cycle on and off every 30
seconds
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Freeze CycleFreeze Cycle
• Reservoir water must cool to a preset point in 5 minutes– Controller checks water and discharge temps– Check to confirm that refrigeration system is
functioning– And that the inlet water valve is not leaking thru
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Freeze CycleFreeze Cycle
• The first 3 cycles after any restart have a water temperature check– If less than the preset limit, the pump switches OFF for
30 seconds– Water refills the reservoir after the pump restarts
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Freeze CycleFreeze Cycle
• Water Re-fill– The water valve will open two times in the freeze cycle
to refill the reservoir– This makes the System Controller for the SCE275
different from the CM3
– Controllers are NOT interchangeable between this self-contained machine and CM3 modular machines
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Freeze CycleFreeze Cycle
• End of freeze determined by the water level– Fans switch off just before harvest to build up heat
• Fan off time varies by discharge temperature– If low, more fan off time is used– Varies between 0 and 60 seconds
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Cube SizeCube Size
Water FullWater Full
SlotSlot
Water Level SensorWater Level Sensor
• Sensor Module– Two photo-electric eyes– Bottom one senses water
fill– Top one senses water fall
• reservoir refills • full cubes • end of freeze
– Slot size determines cube size - NOT ADJUSTABLE
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InletInletSuctionSuction
OperationOperation
• Two 5 row x 10 column evaporators
• In Series– Inlet at bottom of each
• Same ice making area as CME256
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Harvest CycleHarvest Cycle
• Fans shut off before the end of freeze– Builds up heat
• Water pump shuts off at the beginning of harvest– On again in 40 seconds
• Hot gas valve opens• Water inlet valve opens
– Until reservoir is full + percentage of fill time
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Ice LevelSensors
Harvest CycleHarvest Cycle
• Ice Level Sensors– Between the evaporator
plates– Two photo-electric eyes– Sense ice harvesting– Sense bin full when ice fills
up to block the infrared light
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Harvest CycleHarvest Cycle
• SCE275 harvest time adapts to changing conditions– Bin control sensors “see” ice falling– The first harvest cycle will be 5 minutes long to
establish a baseline– The controller then adjusts the harvest cycle time to
match the requirements for an efficient harvest
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Harvest BeginsHarvest Begins Harvest EndsHarvest Ends
Harvest Harvest BeganBegan HarvestHarvest
EndedEnded
Total Current Harvest Cycle TimeTotal Current Harvest Cycle Time(prior cycle actual + a % of actual)(prior cycle actual + a % of actual)
Actual Time to Release IceActual Time to Release Ice(prior cycle)(prior cycle)
Percent of ActualPercent of Actual
Last Cube Last Cube FellFell
Harvest Cycle TimingHarvest Cycle Timing
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Harvest CycleHarvest Cycle
• Pump is off for 40 seconds• Fans are off• Water valve opens
– Shuts off when reservoir is full + overflow• Pump off after 6 minutes of harvest• Pump off when bin is full• Last harvest 5 minutes long
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Water FillWater Fill
• Fill rate calculated every cycle– Time from water valve open to water sensor
satisfaction• Overflow time adjusted every cycle
– Percent of fill time is used for overflow• Amount of overflow rinse adjustable
– Percent manually adjustable• Water has limited time to fill reservoir
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Number of GreenNumber of GreenLights = Rinse SettingLights = Rinse Setting
Water RinseWater Rinse
• There are 5 levels of rinse to adjust to– Maximum– Heavy– Standard - Factory setting– Moderate– Minimum
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End of HarvestEnd of Harvest
• Harvest time expired– Returns to freeze OR if Bin is full– Shuts down when ice level controls are blocked for 20
seconds or more• If maximum harvest time occurred
– Will try one more cycle– Will shut down if it happens again
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Ice Level Control SystemIce Level Control System
• When the light receiver no longer senses light for 20 seconds or more– Bin full light on controller glows– Machine shuts down at the end of the next harvest
cycle– Cannot restart for 4 minutes
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Restarts: Power InterruptionRestarts: Power Interruption
• Automatic Restart– Open hot gas valve– Open water valve to reservoir– Start pump– Start compressor, freeze for 30 seconds– Harvest for 4 minutes
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Restarts: Water InterruptionRestarts: Water Interruption
• Automatic restart– Shuts off when can’t refill reservoir fast enough– Attempts a restart every 20 minutes
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MaintenanceMaintenance
• Air Filter– Remove left grill– Pull filter out thru slot in
base– Filter between fans and
condenser– Cleanable filter– Now also used on
• AFE400• SCE170
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Nylon ScrewNylon Screw
Left Ice Level ControlLeft Ice Level Control
Cleaning & SanitationCleaning & Sanitation
• The ice level controls must be cleaned– Place them in the reservoir
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Cleaning & SanitationCleaning & Sanitation
• Locate the “Clean” button on the controller
• Push and release the “Clean” button to start the cleaning process– Pour in cleaner when
pump restarts
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Soak Cube Deflector in Soak Cube Deflector in Cleaning SolutionCleaning Solution
Cleaning & SanitationCleaning & Sanitation
• Circulate cleaner for 10 minutes– Push Clean again to rinse
system• After 20 minutes
– Push Off & reassemble unit
– Push Freeze to restart
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Cleaning & SanitationCleaning & Sanitation
• Water Distributors must be clean
• Slots at the top of the evaporators must be clean
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Cleaning & SanitationCleaning & Sanitation
• Proper assembly– Ice Level Controls
Behind Water Trough Flanges
– Water Troughs Marked Front and Back - do not reverse
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ServiceService
• Component Access– Cabinet may be
removed while machine is built in and installed
– Begin by removing fasteners holding hood to bin
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ServiceService
• Component Access– Then slide hood off bin
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ServiceService
• Component Access– Then remove all grills– Remove two fasteners
holding bin to chassis
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ServiceService
• Component Access– Disconnect bin drain hose
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ServiceService
• Component Access– Rotate the bin up and
remove it from the chassis
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ServiceService
• Air Cooled Chassis– Blow-thru condenser– Two fans– R-404A refrigerant– Access valves in front– Controller in front
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Tecumseh CompressorTecumseh Compressorfor both Air and Water Cooledfor both Air and Water Cooled
ServiceService
• Water Cooled Chassis
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Water Valve Mounted to Water Valve Mounted to Recessed Utility BoxRecessed Utility Box
Top of Box May be RemovedTop of Box May be Removedto Disconnect Water Inlet Lineto Disconnect Water Inlet Line
Service: Water ValveService: Water Valve
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Service: High Voltage BoxService: High Voltage Box
• Compressor Relay• Capacitors• Transformer• Contactor• Box may be moved up
for better access
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Service & DiagnosticsService & Diagnostics
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The Recipe for IceThe Recipe for Ice
Water70%
Refrigeration10%
Electrical20%
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Diagnostic LightsDiagnostic Lights
• Unit shuts down & light glows– Restarts automatically after 50 minutes
• Shuts down again if another malfunction occurs• Shuts down and needs manual restart if another (the
third consecutive) occurs– Will auto-restart indefinitely if shut down for lack of
water– Two consecutive maximum harvest cycles will cause a
shut-down
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Service DiagnosticsService Diagnostics
• Water Diagnostic Light Blinks Once and Repeats– Check Water Pump &
Hose
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Service DiagnosticsService Diagnostics
• Water Diagnostic Light Blinks Twice and Repeats– Check For Slow/No Water
Fill• Dirty Water Filter• No/Low Pressure• Standpipe too low
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Standpipe HeightStandpipe Heightis Criticalis CriticalMust be 3 & 27/32Must be 3 & 27/32””From Top of From Top of Standpipe To Standpipe To Nearest LedgeNearest Ledge
ServiceService
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Service DiagnosticsService Diagnostics
• Water Diagnostic Light is ON all the time - Does NOT blink– Check for water valve
leaking thru rapidly
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Service DiagnosticsService Diagnostics
• Refrigeration Diagnostic Light Blinks Once and Repeats– Indicates Maximum
Harvest Time Needed to Release Ice
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Service DiagnosticsService Diagnostics
• Refrigeration Diagnostic Light Blinks Twice and Repeats– Indicates That NO Ice Was
Harvested– May be an Ice Level
Control Problem
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Service DiagnosticsService Diagnostics
• Check Ice Level Controls– Leave Hood ON– Block Ice Level Controls and Check
Bin Full Light• Light should be ON• If not, unplug #4 on the controller &
jump the pins together– Light should blink– If it does, the controller is OK, but
the ice level controls must be replaced
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Service DiagnosticsService Diagnostics
• Refrigeration Diagnostic Light Blinks 3 Times and Repeats– Indicates High Discharge
Temperature
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Service DiagnosticsService Diagnostics
• Refrigeration Diagnostic Light Is ON all the Time, Does NOT Blink– Indicates Either a
Maximum Length Freeze Cycle or
– Low Discharge Temperature
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Service DiagnosticsService Diagnostics
• Both Diagnostic Lights are On– Indicates Thermisitors are
unplugged or not working
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Refrigeration ServiceRefrigeration Service
• Air Cooled– One fan not working causes low capacity– Dirty air filter can result in refrigeration diagnostic light
on steady• Compressor
– Overheating compressor can result in refrigeration diagnostic light on steady
• Most likely from dirty air filter
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Refrigeration ServiceRefrigeration Service
• Water Cooled– Water interruption causes compressor to shut off -
automatic reset HPC– Control system keeps going– When water is restored, compressor re-starts
• But maximum freeze time may have been exceeded
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Refrigeration Service Refrigeration Service
• Hot Gas Valve– If it leaks thru, will be hot on both sides during freeze– If it will not open, frost will be on evaporator tubing
during harvest• TXV
– Restricted valve = high superheat– No metering = low superheat
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Refrigeration ServiceRefrigeration Service
• Low Side Pressure– End of Freeze 24 - 29 PSIG– Peak in Harvest 90 - 130 PSIG
• Discharge Pressure– End of Freeze 235 - 300 PSIG– Harvest 240 - 270 PSIG
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Liquid ChargeLiquid Charge
Weigh In ChargeWeigh In ChargeEvacuate to 300 micronsEvacuate to 300 microns Use Nitrogen PurgeUse Nitrogen Purge
Use HFC Leak DetectorsUse HFC Leak Detectors
RR--404A404A
Refrigeration ServiceRefrigeration Service
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SCE275 SummarySCE275 Summary
• CM3 technology under-the-counter– No altitude or seasonal adjustments
• SCE serviceability– Cabinet removable while unit is installed– Cabinet is non-rusting polyethylene
• Air flow in and out the front– May be built-in at the top and sides