Ac 46-56-86 Series-2nd Half

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AC 46-56-86AC 46-56-86

MAINTENANCEMAINTENANCEMAINTENANCE

AC 46-56-86AC 46-56-86

MAINTENANCEMAINTENANCE

The models AC 46, AC 56 & AC 86 are

equipped with a special PC Board that

operates like a

“Cleaning/Maintenance Reminder”.

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When condensingtemperature is morethen 60°C, thecondenser sensor senda signal to theCleaning/MaintenanceRemind Board to…….

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0

10

70

40

30

20

80

60

50

>60ºC


…..activate/energize

the RED Light with

machine still in

operation.

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This is the signal to

clean the air cooled

condenser filter by

taking it out from

the front panel.

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In case the RED

Light is blinking

slow (0,5” ON -

3” OFF) with

machine still in

operation….

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…. it’s the signal to

perform the

cleaning/de-scaling of

the water system.

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MAINTENANCEMAINTENANCEThe time between

cleaning/de-scaling

can be changed

according to the

quality of the water

used as per setting of

the two Dip Switches

of the PC Board....

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….as per attached

chart.

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DIP SW 1 DIP SW 2 TIME

ON ON 1 MONTH

OFF ON 3 MONTHS

ON OFF 6 MONTHS

OFF OFF 12 MONTHS

MAINTENANCEMAINTENANCEThe most important program on the maintenance of the cubers isthe cleaning/sanitizing to be done on regular base, as detailed herebelow:

• Sanitizing: Every month

• Cleaning: Every sixor when cleaning remind board signals it.

On next slides will be shown the procedure for cleaning andsanitizing.

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MAINTENANCEMAINTENANCETOOLS REQUIRED

• Medium PhillipsScrewdriver

• Medium Flat Screwdriver

• Pair of safety gloves

• Bucket

• Different types of brush

• Approved Cleaner/Sanitizer

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Remove the front…. ….and top panel.

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Wait till the end of

the defrost/harvest

cycle then Switch

OFF the machine

at Push Button

Master Switch.

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Scoop out all ice cubes storedinto the bin so to prevent itscontamination then...

….take out the S.S. spring holdingthe soft plastic plug to the bottomof the water sump ….

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….and remove

the soft plastic

plug by pulling

it down so to

drain out all

water from the

water sump.

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Unloose the two

thumb screws

holding the

curtain assy to

the

evaporator/sump

chamber and ….

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…. take out the

curtain with its

own plastic

bracket.

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MAINTENANCEMAINTENANCEGrasp the

spray platen

assy on the

center spray

jet and lift it

up so to have

access to the

water sump.

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Turn

counterclockwise

the spray platen

seat and …..

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… remove it

from its

bottom hole.

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Disconnect

the plastic

hose from the

water pump

outlet port.

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Prepare the cleaningsolution by diluting ina plastic bucket twoliters of lukewarmwater (max 40ºC) with200 cc ofSCOTSMAN IceMachine Cleaner.

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MAINTENANCEMAINTENANCEPrepare, in asuitable basin, asecond cleaningsolution by dilutingfour liters oflukewarm water(max 40ºC) with400 cc ofSCOTSMAN IceMachine Cleaner.

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MAINTENANCEMAINTENANCEPoor into thecleaning solutionall parts previouslyremoved from thewater system i.e.:

• Spray platen

• Curtain assy

• Spray platen seat

• Soft Plastic plug

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Leave them into

the cleaning

solution for about

10 minutes then,

with an help of a

plastic brush,

remove all scale

deposit then….

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….wash them under

tap water.

When finish, install

again all removed parts

following the

procedure on reverse.

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Remove the evaporator coverthen….

….slowly pour onto the evaporatorthe cleaning solution.

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With the help of

a brush dissolve

the most

resistant and

remote scale

deposits in the

plastic platen.

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Switch ON the

machine at Push

Button Master

Switch.

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MAINTENANCEMAINTENANCEWith the water pump in operation the cleaning solution in kept incirculation through the entire water system.

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Let the unit remain in

the freezing mode for

about 20 minutes then

move the Cleaning

Switch on the Cleaning

position (II) for about

four-five minutes

till…...

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MAINTENANCEMAINTENANCE……all the ice cubes produced with the cleaning solution arereleased down from the evaporator.

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BINTSTAT

COMPRESSOR

MOTORWATERHOT

GASVALVE

WATERINLETVALVE

BY-PASSSWITCH

EVAPORATORTHERMOSTAT

PUMPFAN

3

2

46

SWITCHMASTER

SAFETYREMINDBOARD

CONDENSER

& ALARM SWITCHRE-SET BUTTON

SENSOR


Flush out the cleaning solutionfrom the sump by removing thesoft plastic plug then….

…. pour onto the evaporator cavitythree liters of fresh water to rinsethe molds and the platen.

AC 46-56-86AC 46-56-86


Turn again the CleaningSwitch on Operatingposition (I) so to leavethe water pumpcirculating the freshwater and rinse thewater system

Do it twice so to be sure no more trace of descaling/cleaningsolution remains into the sump.

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Pour on the upper side of theevaporator 2 liters of freshwater with 10-15 drops ofScotsman Antialgae Solutionthen….

…. turn again the CleaningSwitch in Operating Position (I)so to have the water pumpcirculating the sanitationsolution for 10 minutes.

NOTE. Do not mix delimer with sanitizingsolution to avoid the generation of a veryaggressive acid.

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Flush out the sanitizing solution from thesump then….

…. turn the CleaningSwitch to CleaningPosition (II) for 2-3minutes….

…. and then again inOperating Position (I).

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Place again theevaporator cover andthe service panelspreviously removed.

At completion of the freezing and harvestcycle make sure of proper texture andclearness of the ice cubes and that they donot have any acid taste.

ATTENTION. In case the ice cubes are cloudy-white and have acid taste, melt them

immediately by pouring on them some warmwater so to prevent that anybody can use them.

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Wipe clean and rinse the inner surface of the storage bin.Wipe clean and rinse the inner surface of the storage bin.

REMEMBER. To prevent theaccumulation of undesirable

bacteria it is necessary to sanitizethe interior of the storage bin with a

sanitizing solution every week.

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SERVICEANALYSISSERVICESERVICE

ANALYSISANALYSIS

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SERVICE ANALYSISSERVICE ANALYSIS

This is a ScotsmanIce Cube.

It must be clear, solidwith a smalldepression on itsbottom rim of about3-4 mm.

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This ice cube is clear, solidbut it has a deep depressionon its bottom rim due to a tooshort freezing cycle.

It is necessary to extend thelength of the freezing cycleby turning the…..

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….. Evaporator

Thermostat a little bit

clockwise.

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This is a typical ice cubeclear on its upper left sideand white and corroded onits bottom right side.

The reason is that the waterdoesn’t reach in correctlythe inside of some of the tincooper molds.

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Probably one ormore of thespray jets of thespray platen ispartially lookedby scale/dirt andthe water is nolonger sprayedas a completeinverted watercone.

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SERVICE ANALYSISSERVICE ANALYSISTo overcamethe problem itis necessaryfirst to find outwhich of thesix spray jetsdoesn’t spraywater in thecorrect waythen removethe completespray platenfrom the sumpand ….

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….unloose the two

screws securing

the plastic spray

cover to clean it or

replace it with a

new one.

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When refit it onthe spray platenbe careful incorrectly installthe O ringbetween thespray cover andits bottom seat.

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This is a typical ice cube; clearon its upper side and white andcorroded on its bottom side.

The water is sprayed in thecorrect way and under the rightpressure only during the firstportion of the freezing cyclewhile on the second half the levelof the water in the sump is notenough to assure the proper sprayof the water pump (cavitation).

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SERVICE ANALYSISSERVICE ANALYSISAC 46-56-86AC 46-56-86


The reason is the too low water level into the sump during theharvest cycle that could be related to:

• Too low water inlet pressure• Clogged water filter

• Clogged water inlet strainer

• Clogged water flow control

• Water leak through the front curtain

• Water leak through the overflow stand pipe

AC 46-56-86AC 46-56-86


The reason is the too low water level into the sump during theharvest cycle that could be related to:• Too low water inlet pressure

• Clogged water filter• Clogged water inlet strainer




AC 46-56-86AC 46-56-86

SERVICE ANALYSISSERVICE ANALYSISThe reason is the too low water levelinto the sump during the harvest cyclethat could be related to:

• Too low water inlet pressure

• Clogged water filter

• Clogged water inlet strainer• Clogged water flow control


• Water leak through the overflow standpipe

AC 46-56-86AC 46-56-86


The reason is the too low water level into the sump during theharvest cycle that could be related to:• Too low water inlet pressure



• Clogged water flow control• Water leak through the front curtain


AC 46-56-86AC 46-56-86

SERVICE ANALYSISSERVICE ANALYSISThe reason is the too low water level into the sump during theharvest cycle that could be related to:

• Too low water inlet pressure




• Water leak through the frontcurtain• Water leak through the overflowstand pipe

AC 46-56-86AC 46-56-86

SERVICE ANALYSISSERVICE ANALYSISAC 46-56-86AC 46-56-86

• Too low water inletpressure• Clogged water filter• Clogged water inlet strainer• Clogged water flow control• Water leak through thefront curtain

• Water leak through thesoft plastic plug

The reason is the too low water level into the sump during theharvest cycle that could be related to:


This ice cube is clear, solidbut it is oversized.

It is necessary to reduce thelength of the freezing cycleby turning the EvaporatorThermostat Knob…..

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….. a little bit

counter-clockwise.

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These ice cubes areboth clear, solid butsome are oversizedand some other areundersized.

If so the possiblereason is an incorrectcharge of refrigerantin the system (toolow).

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SERVICE ANALYSISSERVICE ANALYSISLooking the upper side ofthe evaporator after 15-20minutes in the freeze theserpentine is properlyfrosted mainly on the firstportion of the same (inletof refrigerant) while on thesecond portion (outlet) thefrost is very thin (noexchange of heat betweenrefrigerant - already invapor state - and sprayedwater).

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SERVICE ANALYSISSERVICE ANALYSISCheck the operatingpressures of the refrigerantsystem connecting thegauges on hi and low servicevalve.

The operating pressures atthe end of the freezing cyclewith unit at 21ºC ambientmust be:

Hi pressure (air):Hi pressure (air): 8 bar8 bar(110 PSI)(110 PSI)

AC 46-56-86AC 46-56-86

SERVICE ANALYSISSERVICE ANALYSISCheck the operating pressuresof the refrigerant systemconnecting the gauges on hiand low service valve.

The operating pressures at theend of the freezing cycle withunit at 21ºC ambient must be:

Hi pressure (air): 8 bar(110 PSI)

Hi pressure (water): 8-9 barHi pressure (water): 8-9 bar(110-125 PSI)(110-125 PSI)

AC 46-56-86AC 46-56-86

SERVICE ANALYSISSERVICE ANALYSISCheck the operating pressuresof the refrigerant systemconnecting the gauges on hiand low service valve.

The operating pressures at theend of the freezing cycle withunit at 21ºC ambient must be:

Hi pressure (air): 8 bar(110 PSI)

Hi pressure (water): 8-9 bar(110-125 PSI)

Low pressure:Low pressure: 0-0,10-0,1bar (0-2 PSI)bar (0-2 PSI)

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The unit is OFF

with RED

LIGHT ON

steady.

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This means that

condensing

temperature rises

up to more then

70ºC.

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0

10

70

40

30

20

80

60

50

>70ºC


To restart the

operation of the

machine it is

necessary to

push and release

the reset RED

button.

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SERVICE ANALYSISSERVICE ANALYSISThe possible reasons are:

• Fan motor (air cooledversion) inoperative• No water to the water cooledcondenser (water cooledversion)

• Hi pressure control (watercooled version) inoperative

• Water inlet solenoid valve tocondenser inoperative

AC 46-56-86AC 46-56-86


• Fan motor (air cooled version)inoperative

• No water to the watercooled condenser (watercooled version)• Hi pressure control (watercooled version) inoperative

• Water inlet solenoid valve tocondenser inoperative

CLOSEDCLOSED

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• No water to the water cooledcondenser (water cooledversion)

• Hi pressure control (watercooled version) inoperative• Water inlet solenoid valve tocondenser inoperative

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• No water to the water cooledcondenser (water cooledversion)

• Hi pressure control (watercooled version) inoperative

• Water inlet solenoid valveto condenser inoperative

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A SCOTSMAN EUROPEA SCOTSMAN EUROPE presentation presentationAuthor: R. CerianiAuthor: R. Ceriani

AC 46-56-86AC 46-56-86

Ac 46-56-86 Series-2nd Half

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