mv 300 mv 450 mv 600 mv 1000 - blazekgastro.cz€¦ · page 4 page 4 mv 300 - as air 240 mv 300 -...

SERVICE MANUAL

MV 300MV 450MV 600

MV 1000R 404 A VERSION

Electronicmodular cubers

MS 1000.24 MS 1000.77 - REV. 07/03

TABLE OFCONTENTS

Table of contents 2Specifications 3-4-5-6-7-8-9-10

FOR THE INSTALLERIntroduction 11Storage bin 11Standard legs 11Important operating requirements 11Select location 12Storage bin 12Ice machine 12Stacking instructions 12Final check list 14

FOR THE PLUMBERConform to all applicable codesWater inlet 13Drains 13For the electricianElectrical connections 13

START-UPStart-up cycle 15Freezing cycle 15Harvest cycle 15

OPERATIONRefrigeration during freeze 17Water system 18Refrigeration system during harvest 19Water system 19Control sequence 19Alarm conditions 20PC Board set up 20

SERVICE SPECIFICATIONSComponent 22Operating characteristics 22

COMPONENT DESCRIPTIONComponent description 23

WIRING DIAGRAMMV 250-450-600-1000 air/water cooled 26MV 1000 air/water cooled 27

SERVICE DIAGNOSISService diagnosis 28

MAINTENANCE & CLEANING INSTRUCTIONIcemaker 29Ice storage bin 29Cabinet erxterior 29Cleaning (Icemaker) 29-30

SPECIFICATIONS

MODULAR CUBER MV 300

NOTE. To keep your Modular cuber performing at its maximum capacity, it is necessary to performperiodic maintenance as outlined on page 29 of this manual.

ice making capacity

ICE

PR

OD

UC

ED

PE

R 2

4 H

RS

ICE

PR

OD

UC

ED

PE

R 2

4 H

RS

130

120

110

100

90

K g .

32 °C27 15 10

AIR COOLED MODELS

WATER TEMPERATURE

AM

BIE

NT

TE

MP

ER

AT

UR

E

°C

10

21

32

38

WATER COOLED MODELS

AM

BIE

NT

TE

MP

ER

AT

UR

E

K g .

°C27 21 15 10

°C10

21

32

38

21

WATER TEMPERATURE

140

130

110

90

70

32

MV 300 - AS Air 240MV 300 - WS Water 2000

SPECIFICATIONS (CONT'D)

AccessoiresKSC 300 - Cube stacking kit

Dimensions:HEIGHT 575 mm. (22" 1/2)WIDTH 560 mm. (22")DEPTH 620 mm. (24" 1/2)WEIGHT 55 Kgs.

Model Cond. unit Finish Comp. HP

MV 300 - MACHINE SPECIFICATIONS

Water req.lt/24 HR

ModelBasicelectr. amps

Startamps watts Electric power cons.

Kwhx24 HR.N. of wires

AmpsFuse

220-240/50/1MV 300 - ASMV 300 - WS 3x1,5 mm2 10

Cubes per harvest: 132 Full - 264 Half* With water at 15°C

Stainless Steel 3/4

3,83,3

18 780650

18.715.6

AIR COOLED

CORD SET

3/4” GAS WATER INLET

WATER OUTLET

WATER COOLED

3/4” WATER INLET WATER COOLED ONLY

3/4” WATER DRAIN WATER COOLED ONLY

SPECIFICATIONS



ice making capacity

220

200

180

160

140

120

K g .

32 °C27 21 15 10

AIR COOLED MODELS

WATER TEMPERATURE

AM

BIE

NT

TE

MP

ER

AT

UR

E

ICE

PR

OD

UC

ED

PE

R 2

4 H

RS

.

°C

10

21

32

38

WATER COOLED MODELS

WATER TEMPERATURE

AM

BIE

NT

TE

MP

ER

AT

UR

E

ICE

PR

OD

UC

ED

PE

R 2

4 H

RS

.

220

200

180

160

140

120

K g .

32 °C27 21 15 10

°C

1021

32

38




Water req.lt/24 HR




AmpsFuse

220-240/50/1MV 450 - ASMV 450 - WS 3x1,5 mm2 16


Stainless Steel 7/8MV 450 - AS Air 380MV 450 - WS Water 1800

65

29 1000 900

24.021.6



AIR COOLED

CORD SET


WATER OUTLET

WATER COOLED



SPECIFICATIONS



ice making capacity

320

290

260

230

200

170

K g .

32 °C27 21 15 10

AIR COOLED MODELS

WATER TEMPERATURE

AM

BIE

NT

TE

MP

ER

AT

UR

E

ICE

PR

OD

UC

ED

PE

R 2

4 H

RS

.

°C

10

21

32

38

WATER COOLED MODELS

WATER TEMPERATURE

AM

BIE

NT

TE

MP

ER

AT

UR

E

ICE

PR

OD

UC

ED

PE

R 2

4 H

RS

.

300

280

260

240

220

200

K g .

32 °C27 21 15 10

°C

1021

32

38




Water req.lt/24 HR




AmpsFuse

220-240/50/1MV 600 - ASMV 600 - WS

3x1,5 mm2 16



Stainless Steel 1 1/2

107.5

31 16001300

38.431.2



AIR COOLED

CORD SET


WATER OUTLET

WATER COOLED



SPECIFICATIONS



ice making capacity

500

450

400

350

300

K g .

32 °C27 21 15 10

AIR COOLED MODELS

WATER TEMPERATURE

AM

BIE

NT

TE

MP

ER

AT

UR

E

ICE

PR

OD

UC

ED

PE

R 2

4 H

RS

.

°C

10

21

32

38

WATER COOLED MODELS

500

450

400

350

300

K g .

32 °C27 21 15 10

WATER TEMPERATURE

AM

BIE

NT

TE

MP

ER

AT

UR

E

ICE

PR

OD

UC

ED

PE

R 2

4 H

RS

.

°C

10213238




Water req.lt/24 HR




AmpsFuse

MV 1000 - ASMV 1000 - WS

5x1,5 mm2 10


Stainless Steel 2.5

5.5 14 25002100

60.050.4



CORD SET


WATER OUTLET

AIR COOLED

WATER COOLED




380-400/50/3

FOR THE INSTALLER

INTRODUCTION

These instructions provide the specifications andthe step-by-step procedures for the installation,start up and operation for the SCOTSMANModel MV 300-450-600-1000 Modular Cubers.The Models MV 300-450-600-1000 ModularCubers are quality designed, engineering andconstructed, and are thoroughly tested icemakingsystems, providing the utmost in flexibility to fitthe needs of a particular user.

INSTALLATION NOTE: Allow 15 cm.minimum space at sides and back forventilation and utility connections.

STORAGE BIN

The MV 300 stack on top of Scotsman bin modelB 193; the MV 450-600-1000 stack ontoSCOTSMAN bin model B 393.

Refrigerant R 404 ACharge per nameplate rating.

STANDARD LEGS: Furnished with storage bin.Four legs screw into mounting sockets on cabinetbase. Provide 18.5 cm. (7’’) minimum heightincluding adjustable leveling foot.Optional Kit Casters for B 393 (KRB 550) areavailable on request.

IMPORTANT OPERATING REQUIREMENTS

MINIMUM MAXIMUM

Air Temperature 10°C (50°F) 40°C (100°F)

Water Temperature 5°C (40°F) 35°C (90°F)0

Water Pressures 1 bar gauge 5 bar gauge

Electrical VoltageVariations Voltagerating specifiedon nameplate -10% +10%

Extended periods of operation exceeding theselimitations constitues misuse under the terms ofManufacturer’s Limited Warranty, resulting in aloss of warranty coverage.

SELECT LOCATIONThe first step in installing the equipment is toselect the location. The purchaser of the unit willhave a desired spot in mind, check out that spotto insure that it is:- indoors, in an environment that does not exceed

the air and water temperature limitations for theequipment.

- that the necessary utilities are available includingthe correct voltage electrical power.

- that there be space around the installed machinefor service, 15 cm. minimum left, right, and rearfor air-cooled models.

STORAGE BINThe Scotsman bins for these units are the B 193and B 393.Other bins may be available with bin tops to varythe storage capacity. Lay the bin on its back,using cardboard from the carton to support it,screw in the legs.Stand the bin upright, and correct any possiblesmall tears in the machine mounting gasket withfood grade silicone sealant.

ICE MACHINEThe use of a mechanical lift is recommended forlifting the uncrated icemaker onto the bin.Remove front, top and sides panels.Place the unit directly onto the bin, align it withthe back of the bin. Locate the hardware package,take out two mounting screws, and use them tosecure the Icemaker to the two sides of the bin.See illustration below.

Remove all shipping material as well as themasking tapes from the ice deflector/evaporatorcover.

Remove first the ice deflector/evaporator coverthen the masking tape from the ice thicknesssensor.

AIR BAFFLEInstall on the back side of the machine the airbaffle as per instruction provided with it.

STACKING INSTALLATIONTo stack a second MV onto the present one, firstremove the top panel from the lower machine.Add a bead of food grade silicone sealant to thetop edges of the lower units freezing compart-ment. Lift the top machine onto the bottom

When choosing the water supply for the MVCuber, consideration should be given to:

A. Length of run.

B. Water clarity and purity.

C. Adequate water supply pressures.

Since water is the most important single ingredientin producing ice you cannot over emphasize thethree items listed above. Low water pressure,below 1 bar may cause malfunction, of theicemaker unit. Water containing excessiveminerals will tend to produce cloudy colored icecubes, plus scale build-up on parts in the watersystem.Heavily chlorinated water can be controlled usingcharcoal or carbon filters.

DRAINS

AIR-COOLED MODELS: There is one 20 mm.dia sump drain fitting at the back of the cabinet.Insulations in high humidity areas is recom-mended. The ideal drain receptacle would be atrapped and vented floor drain.WATER-COOLED MODELS: Besides the abovedrain, a separate condenser drain must be run.Connect it to the - 3/4'’ gas - condenser drainconnection at the back of the cabinet.STORAGE BIN: A separate gravity type drainneeds to be run, similar to the air-cooled sumpdrain. Insulation of this drain line is recom-mended.

FOR THE ELECTRICIANELECTRICAL CONNECTIONS

The unit come equipped with an electrical cordfor power supply. The lead wires must beconnected to an electrical plug that correspondsto the local electrical codes and requirements orto a separate two poles disconnect box withopening to the contacts of about 3 millimeters.The disconnect box shoulds be placed close tothe selected ice maker location to be easily andprompt reached.Undersized wiring or unproperly installedelectrical circuit will result in major problems andmalfunctions.Voltage variations shoud not exceed ten percent.

IMPORTANT - All plumbing and electricalconnections must be made by licensedplumbers and electricians, this one mustfollow the electrical specifications printedon the ice maker nameplate.

NOTE: All SCOTSMAN Cubers require aneutral wire and a solid earth ground wire toprevent possible severe Electrical ShockInjury to individuals or extensive damage toequipments.

machine, (the use of a mechanical lift isrecommended for this step). Align the twomachines cabinets, and using the 2 screw fromthe top units, hardware package, fasten the twounits together at the side cabinets.Then make use of the Stacking Kit KSC 300, KSC450 and KSC 1000, to be mounted as per fittinginstructions included in their package, respectivelyon MV 300, MV 450-600 and MV 1000 located inthe bottom for proper conveying, of the ice cubesmade by the top unit, into the storage bin.With food grade silicone perfectly seal the edgebetween the freezing compartment of the uppermachine and of the bottom machine so to avoidany possible leak of water through the clearencein between.

FOR THE PLUMBER

CONFORM TO ALL APPLICABLE CODES

WATER INLET

AIR-COOLED MODELS: The recommendedwater supply is cold water connected tothe - 3/4'’ gas - male fitting at the back of thecabinet. Install a hand valve near the machine tocontrol the water supply.

1) Switch 2) Plug receptacle 3) Electrical plug 4) Water inlet 5) Shut-off valve 6) Water filter 7) Water outlet line 8) Bin water outlet line 9) Open vented water drain10) Water outlet from the condenser:

water cooled version only.

FINAL CHECK LIST

1. Is the cabinet/bin level?

2. Is the cuber in a location where ambienttemperatures are a minimum of 10°C (50-de-grees F.) all year around and to not exceed amaximum of 40°C. (100°F.).

3. Is there at least a 15 cm. clearance behindand around the cabinet for all connections and forproper air circulation?

4. Have all electrical and piping connectionsbeen made?

5. Has the electrical power supply wiring beenproperly connected and the voltage tested andchecked against the nameplate rating? Has theunit properly grounded.

6. Is the water supply line shutoff valve installedand opened and has the inlet water supplypressure been checked to insure a minimum of1 bar without exceeding a maximum of 5 bar.

7. Have the compressor holddown bolts beenchecked to be sure the compressor is snug onthe mounting pads.

8. Check all refrigerant lines and conduit linesto gard against vibration and possible failure.

9. Has the cuber and the bin been wiped cleanwith clean damp cloths?

10. Has the owner/user been given the UserManual and instructed on how to operate theicemaker and the importance of periodicmaintenance?

11. Has the owner/user been given the nameand telephone number of the AuthorizedSCOTSMAN Distributor or Service Agencyserving him?

12. Has the Manufacturer’s Registration Cardbeen properly filled out?Check for correct Model and Serial Numbersfrom nameplate, then mail the completed card tothe Manufactured.

TYPICAL STACKING INSTALLATION

KIT STACKING KSC 300: TO STACK 2 MV 300'sKIT STACKING KSC 450: TO STACK 2 MV 450-600'sKIT STACKING KSC 1000: TO STACK 2 MV 1000's

START-UP

START-UP CYCLE1. Open the water tap/valve and switch ON thepower on the electrical supply line.2. The models MV 300 - 450 - 600 enter in theStart Up mode with the PC Board energized as wellas the Green LED of the machine under powerwhile the model MV 1000 enters in 2 hours delaytime controlled by a special Start-up Delay PC Board.

The Green LED of machine in operation isenergized too, blinking fast for 40 seconds .

NOTE: The model MV 1000 is equipped witha compressor crankcase heater and a Startup Delay PC Board set up at 2 hours.During the first 2 hours only the compressorcrankcase heater is energized warning upthe compressor.

3. During the Start Up cycle the components inoperation are:• Hot gas valve• Water Drain Valve• Water Pump

FREEZING CYCLE1. After the Start Up cycle the machine entersdirectly into the Freezing cycle with the followingcomponents energized:• Water Inlet valve• Compressor• Fan motor (in continuous operation for the first3 minutes).

2. The LED energized are:• Machine under power• Machine in operation (steady)

3. Water is coming into the water through theWater Inlet Solenoid Valve till the water reservoirif filled up to the maximum level controlled by aWater Level Sensor.

4. 30 seconds later, the Water Pump starts up.

5. After 3 minutes from the start up of thefreezing cycle, the Water Inlet Solenoid Valve isactivated again for few seconds till the waterreaches the maximum level so to reduce anypossibility of slush ice formation.

6. In the meantime the condenser sensor startsto transmit the current to the PC Board keepingin operation the Fan Motor in ON-OFF mode orcontinuously according to the condenser tempe-rature.

NOTE: Do not remove the evaporatordeflector cover as it will cause the switchingoff of the machine at "STORAGE BIN FULL".

7. The machine remains in the freezing cyclewith the ice that become thicker till the two metalplates of the Ice Thickness Sensor are coveredby the water cascading through the front surfaceof the ice plate.

8. When the Power is transmitted back to thePC Board continuously through the metal platesof the Ice Thickness Sensor for more then 6", themachine enters in the Pre-Harvest or directly intothe Harvest Cycle mode according to:

• FAN MOTOR IN ON-OFF MODE DURINGTHE PREVIOUS FREEZING CYCLERISE UP THE CUT IN TEMPERATURE OFTHE CONDENSER SENSOR TO 38°C (FANMOTOR OFF) AND EXTEND THE LENGTHOF FREEZING CYCLE BY 30" MORE THENGO INTO HARVEST CYCLE

• FAN MOTOR ALWAYS IN OPERATIONDURING THE PREVIOUS FREEZING CYCLEGO STRAIGHT TO THE HARVEST CYCLE

9. First freezing time will range between 15and 20 minutes.Longer time for temperature above 25°C andshorter time required when temperature are below25°C.Average complete cycle time is about 22 min.

HARVEST CYCLE

1. During the harvest cycle the components inoperation are:• Hot Gas valve• Water Drain/Purge Valve• Water Pump for the first 40"• Compressor

POWER OPER.BIN

FULL ALARM

ALARMHI

PRESS.RE-SET

NOTE: This type of machine produce an "ICEPLATE" that breaks when falls down into thestorage bin. Setting the ice thickness sensorin order to have single ice cubes maycause malfunction of the machine.

6. Observe second and third cube harvest.Check if size and shape combination is correct.In areas where extreme problem water conditionsexist, filtering or purifyng equipment isrecommended.

NOTE: If water used is too soft,"demineralized" the ice thickness sensormight not be able to sense the water on itsreeds, there by it will not switch the unit onharvest cycle.A safety system built in the P.C. Boardswitches the unit on harvest cycle wheneverthe freezing period gets longer then 30' or 40'.

NOTE: To assure a correct operation of themachine the water must have a minimumelectrical conductivity of 20 us.

7. Check operation of magnetic switchcontrolling it by keeping open the bottom end ofplastic deflector for more than 30 seconds. Themachine must switch off at storage bin full.Release the plastic deflector. The machine shouldrestart in the freezing cycle mode within fewseconds going through a 3' delay time.

8. Place again all cabinet panels and screwspreviously removed.

9. Thoroughly explain to owner/user the significantspecifications of the ice maker start-up, reset andoperation, going through the procedures in theoperating instructions.Answer all questions about the ice maker by theowner and inform the owner himseft of the nameand telephone number of the authorized serviceagency serving him.

and both

• Machine Under Power• Machine in Operation

2. 30 seconds after the beginning of the HarvestCycle, the Water Inlet Solenoid Valve is energizedfor 10 seconds only in order to have a short flushof fresh water into the sump while the WaterPump is still in operation.

3. The Fan Motor remains in OFF mode unlessthe Condenser Sensor probe rise up to morethen 38°C (same set up as per end of freezingcycle).

4. When the ice plate is falling down from theevaporator, the magnetic switch is activated for awhile providing the signal to the PC Board torestart a new freezing cycle.

5. Observe first ice cube harvest and checksize of ice cubes; if an adjustment is requiredthread down or out screw N. 1 as shown on belowillustration.

This screw position determines the distancebetween the sensor reeds and the egg-crateevaporator thus keeping the ice cube at a properthickness.

REFRIGERATION DURING FREEZE:

This ice machine employes either air or water asa condensing media, the refrigeration system foreither one is a follows:At the hermetic compressor, Refrigerant iscompressed into a high temperature, highpressure gas.The gas moves through the discharge line intothe condenser , air or water-cooled. If air-cooled,the discharge pressure will change with the heatload and the ambient air temperature.If water-cooled, the discharge pressure iscontrolled by the amount of water flowing throughthe condenser - which is determined by thewater regulating valve.After the gas is cooled in the condenser, givingup much of its heat, the gas condenses into ahigh pressure liquid. This liquid travels throughthe liquid line to the metering device, athermostatic expansion valve .The thermostatic expansion valve meters howmuch liquid refrigerant is to be allowed into theevaporator section of the refrigeration system.

This is determined by the temperature of the TXVsensing bulb, located on the suction linemanifold, at the outlet of the evaporator .If the bulb senses a warm suction line, morerefrigerant is allowed into the evaporator, (commonat the beginning of the freeze cycle) and when thetemperature begins to fall, less refrigerant is allowedthrough.This is why the suction side gauge pressure willdecline throughout the freeze cycle. At theevaporator, the liquid refrigerant released fromhigh pressure, boils off in the low pressureenvironment and absorbs heat, thus cooling theevaporator surface and anything near it, such aswater.The low pressure refrigerant vapor then isforced through the heat exchanger where anyexcess liquid refrigerant boils-off, allowing onlyrefrigerant vapor to enter the compressorsuction tube, where it is recompressed intohigh pressure, high temperature gas againand the cycle repeats.

OPERATIONFREEZE CYCLE

REFRIGERATION SYSTEM SCHEMATIC

FREEZE CYCLE

water tube and then cascades down theevaporator surface by gravity. As it flows accrossthe refrigerated evaporator, some of the waterwill be chilled enough to change form, turn to ice,and stay frozen onto the evaporator cells. Most ofthe water returns to the reservoir, to be suckedback into the pump, and repumped over theevaporator.

WATER SYSTEM

A combination of a solenoid water inlet valve witha water level sensor is used to control the level ofthe water into the reservoir/sump.A pump, running continuously, after the first 30"of freezing cycle, forces the water to the top of theevaporator, where it is distributed through a

WATER DISTRIBUTOR TUBEEVAPORATOR

WATER DRAIN VALVE

WATER INLET VALVE

WATER LEVEL SENSOR

WATER PUMP

WATER RESERVOIR

HARVEST (DEFROST) CYCLE

REFRIGERATION SYSTEM SCHEMATIC

REFRIGERATION SYSTEM DURINGHARVEST

The refrigeration system performs the harvest ofice by use of a hot gas bypass valve. When thetime comes to de-ice the evaporators, the hotgas valve is energized, and the high temperatu-re, high pressure gas bypasses the condenser,and is allowed directly into the evaporator. Thehigh pressure gas is cooled by the cold evaporatorso it condenses into a liquid, giving up its heat asit does so. This heat warms the evaporator andthe ice frozen onto the evaporator surface melts,releasing the frozen cubes. Ice then falls bygravity into the storage bin.The liquid refrigerant goes through the suctionline into the heat exchanger where it boils-off sothat only refrigerant vapor is drawn into thesuction tube of the compressor.

WATER SYSTEM

During the harvest cycle, the electric waterdrain valve is energized thereby opening thedrain line.

All water remained in the reservoir at the end offreezing cycle is pumped-out, to the waste,through the water solenoid and drain line duringthe first 40 seconds of the defrost cycle eliminatingany possible build-up and accumulation ofminerals concentration and impurities in the waterreservoir.The water inlet valve is energized during the last10" of the operation of the water pump so to rinsethe water tank with new fresh water.When the released ice cubes drop into the bin,they open-up for a fraction of a seconds thebottom end of plastic deflector.This deflector swinging motion is enough to resetthe contact of the magnetic switch which - viaelectronic control board - deenergizes the waterdrain valve allowing the unit to initiate a newfreezing cycle.The harvest cycle lasts about 1.5÷2 minutes.

CONTROL SEQUENCE

At the start of the freezing cycle, the contacts ofthe magnetic switch mechanically operated by

the actuator plate of the deflector cover areclosed, thereby - via electronic control board -closing the circuit to the main contactor coil andconsequently to the compressor and fan motorsand 30" later, to the water pump motors.Then, as the ice thickness reaches the value thatcorresponds to the full cube size, the film of waterthat constantly cascades over the slab of iceformed on the evaporator, arrives to establish acontact between the two fingers (energised atlow voltage) of the ice sensor control, located onthe front upper right side of the evaporator. If thecontact between the two fingers of the ice sensorremains established - by the film of water - formore than 10 seconds, a small relay of theelectronic board, get energized, controlling -simultaneously both the hot gas valve and thewater drain valve.

NOTE: in case of failure of ice level sensor,the P.C. Board turns - on automatically theunit into the defrost cycle when the freezingcycle reaches 30 or 40 minutes according tothe operation of the fan motor during thefreezing cycle.

At this point, the unit initiates the defrost cycle.The hot gas circulating into the evaporatorserpentine causes a slight melting of ice cubeswhich get released from their molds. Once entirelyreleased the ice cubes drop simultaneously intothe ice storage bin below; by doing so they moveapart from the evaporator bottom end the plasticdeflector. This plastic deflector has on its side amagnetic switch that on account of the deflectorswinging motion, caused by the ice while droppingin the bin, opens and closes their contacts. Thiswill, in turn, disactivate the relay contacts thatcontrols the hot gas and water drain valve whichget deenergized allowing the unit to start a newfreezing cycle.

When the ice bin is full of ice, the last batch of icecubes released from the evaporator accumulatesto keep the bottom end of the plastic deflector inopen position; with the magnetic switch contactsopen for longer than 30'’ the entire unit stops withthe glowing of the corresponding LED.The machine will restart when the ice deflector willbe back in its normal vertical position providedthat 3' are elapsed from unit stop. If not themachine will delay its restart till 3' are elapsed withthe blinking of the green LED.

ALARM CONDITIONS

Both the last two Red LED are ON STEADY:Condenser Sensor OUT OF ORDER.

POWER OPER.BIN

FULL ALARM

ALARMHI

PRESS.RE-SET

Page 20POWER OPER.

BINFULL ALARM

ALARMHI

PRESS.RE-SET

POWER OPER.BIN

FULL ALARM

ALARMHI

PRESS.RE-SET

POWER OPER.BIN

FULL ALARM

ALARMHI

PRESS.RE-SET

Both the last two Red LED are BLINKING SLOW:WATER ERROR

Water level inside the water sump too low after 3'from the activation of the Water Inlet Valve.

Both the last two Red LED are BLINKING FAST:RESET MODE: Charging water through the Waterinlet Solenoid Valve after the tripping OFF onWATER ERROR

The fourth Red LED is ON STEADY: HarvestCycle longer then 3' 30"

The fourth Red LED is BLINKING SLOW: TOOHI CONDENSING TEMPERATURE. Thecondenser sensor detected a temperature > 65°CThe fourth Red LED is BLINKING FAST:RESET MODE: Condenser Sensor < 50°C Fanmotor in operation for 3' then back on Start UpCycle Mode

The fifth Red LED is ON STEADY: TOO HIDISCHARGE PRESSURE > 33 bar 460 PSI

The fifth Red LED is BLINKING FAST:RESET MODE: After pushing the ResetButton of the Pressure Control first the fanmotor starts up for 3' then back on the StartUp Cycle Mode.

The PC Board is also checking the maximumtime of the freezing cycle that changes accordingto the operation of the fan motor during thefreezing cycle (room temperature):

• Fan motor in Max. freezing cycle length ON-OFF mode: equal to 30'

• Fan motor ON Max. freezing cycle length All the time: equal to 40'

Whenever the machine remains in the FreezingCycle for the Maximum time (30 or 40 minutes),the PC Board moves the unit directly into theHarvest Cycle.

AUTOMATIC RESET MODE

The Automatic Reset Mode is activated only forthe following ALARM CONDITIONS:

• WATER ERROR

• TOO HIGH CONDENSING TEMPERATURE

• TOO LONG HARVEST CYCLE

WATER ERROR

The machine remains in OFF mode for 30' then ittries to re-fill water:

YES: Machine remains in operation

NO: Machine again in OFF mode for additio- nal 30'

TOO HI CONDENSING TEMPERATURE:

As soon as the temperature of the CondenserSensor is < 50°C, the PC Board starts up first thefan motor for 3' then the entire machine throughthe Start-Up Cycle Mode.

TOO LONG HARVEST CYCLE:

After the 3' 30" of the Harvest Cycle, the PC Boardmove back the machine into a new FreezingCycle.

PC BOARD SET UP

The PC Board can be set up for:

• Manual Reset Mode (Jump IN)

• Automatic Reset Mode (Jump OUT)

MANUAL RESET MODETo Restart the machine it is necessary to Pushthe RESET BUTTON

➚

Disch. Disch. Hi Suction Suction Amps AmpsPressure Pressure Pressure Pressure Pressure Compressor CompressorFreeze Freeze CUT Beginning end Beginning endmax min OUT Freeze Freeze Freeze Freeze

MV 300 A 17,5 bar 14,0 bar 30 bar 4,3 bar 2,3 bar 15' 3,8 3,2

MV 300 W 16,5 bar 16,5 bar 30 bar 4,3 bar 2,4 bar 16' 3,6 3,1





MV 1000 A 18,0 bar 15,5 bar 33 bar 3,2 bar 1,7 bar 12,5' 4,0 3,1


FreezingtimeMODEL

Refrigerant charge R 404 A

MODEL MV 300 MV 450 MV 600 MV 1000

Air cooled 500 700 850 1600

Water cooled 400 500 550 1200

Refrigerant metering device

Thermostatic expansion valve.

SERVICE SPECIFICATION

In servicing a machine, it is often, useful tocompare that individual units operatingcharacteristics to those of a normally operatingmachine. The data that follows gives thosecharacteristics; however, be aware that thesevalues are for NEW, CLEAN machine operatingat 21 °C ambient and 15 °C water. USE THESENUMBERS AS A GUIDELINE ONLY.

COMPONENT

Reservoir levelMV 300-450-600 .........................80 ÷ 85 mmMV 1000 ....................................100 ÷ 105 mm

Cube Size Control Ice Sensor - distance fromevaporator .........................................3 ÷ 5 mm

High Pressure Safety Switch.MV 300: Cut IN 19 bar - Cut OUT 30 barMV 450-600-1000: Cut IN 23 bar - Cut OUT 33 bar

OPERATING CHARACTERISTICS

On air-cooled models during the freezing cycle,the discharge pressure is maintained betweentwo preset values by means of fan control(condenser sensor); and at the same time, thesuction pressure will also decline reaching it’slowest point just before harvest. Compressoramps experience a similar drop.On water-cooled, the discharge pressure isconstantly, maintained during the freeze cycle bythe water regulating valve. However, suctionpressure and compressor amps, will still declineas the machine freezes ice.

NOTE: Always check nameplate on individualicemachine for special refrigerant chargebefore charging the refrigeration system.Such refrigerant charge is the average chargefor the MV Modular Cubers. However it isimportant to check nameplate for eachmachine.

COMPONENT DESCRIPTION1. Front Console Panel

Equipped with five LED plus a push button thatwhen glow or blink are monitoring:LED Nr. 1Electrical power supply.LED Nr. 2Operation.LED Nr. 3Bin full./Washing.LED Nr. 4Alarm.

2. P.C. BoardLocated in the control box, this board is the brainof the system as it governs the ice machinecyclematic through sensors, relays and switch.It consists of two separated printed circuits one athigh and the other at low voltage integrated witha fuse, of four connectors for the sensors/switches(condenser sensor - BLACK -, magnetic switch- GREEN - ice thickness sensor - RED - waterlevel sensor - BLUE), of two jumpers (one J1 forfactory use only - and the second J2 for theselection between manual or automatic resetmode), of one outlet connector (front LED display- black) one serial port connector (black) and offour plug in terminals for input and output power.With J2 closed the P.C. Board is set up forManual reset mode. When J2 is open on

Automatic Reset mode.The P.C. Board is equipped by an electronicsafety timer that turns-on automatically the unitto defrost cycle when freezing cycle is longerthen 30 or 40 minutes and trips-off completelyunit when defrost cycle is longer then 3,5 minutes(4th Red LED ON).A trimmer, located close to the transformer, canchange the current received back from the IceTickness Sensor according to the ElectricalConductivity of the water.

3. Compressor Contactor

Located in the control box, the compressorcontactor functions to carry the compressor linecurrent. The contactor is wired to receive powerfrom the P.C. Board.

LED Nr. 5Alarm high pressure.BUTTON BReset/Washing.

J2

J1

CONDENSERSENSOR

MAGNETICSWITCH

ICE THICKNESSSENSOR

DISPLAYCONNECTOR

FUSE

POWER INAND SAFETYPRESSURECONTROLS

FANMOTORS

WATERPUMP

COMPRESSOR, HOT GAS, WATERINLET AND DRAIN VALVES

WATERSENSITIVITY

ADJUSTMENT

N.O. - JUMP OUTAUTOMATIC

N.C. - JUMP INMANUAL

-- ++

WATER LEVELSENSOR

SERIALCONNECTOR

FORFACTORYUSE ONLY

MV SERIES

PC BOARD

rear side of the machine and a monitoring light onthe Front Console Panel.

9. Water Regulating Valve(Water Cooled Models)

The Water Regulating Valve functions maintaina constant Compressor head pressure, byregulating the amount of incoming water flowthrough the Condenser, on water-cooled models.The valve operate through the refrigerant systemhigh side pressure. Rotating the adjusting screwlocated on top of the valve, can INCREASE orDECREASE the water flow through the water-cooled Condenser, which in turn, will DECREASEor INREASE the Compressor operating headpressure.

10. Water Distribution SystemThe Water Distribution System function to eventysupply water to all cells of the evaporator plate.The water pump pumps water from the sump tothe tee. From there water is channeled throughthe vertical tygon tube to the water distributors,above the evaporator plate, and from the holes inthe distributor tube water flows to the cells on oneside of the evaporator plate.Gravity flow returns the unfrozen excess portionof water to the sump reservoir for recirculation.

11. Water Drain Solenoid ValveThe Water Outlet Solenoid Valve functions inconjunction with the water pump to flush-out thesump assembly at the beginning (first 40") ofevery harvest cycle. This action cleans-up andrinses the sump during each harvest cycle pre-venting dangerous water minerales concentration.

12. Thermostatic Expansion Valve

The Thermostatic Expansion Valve regulatesthe flow of refrigerant to the evaporator andreduces pressure of liquid refrigerant fromcondensing pressure to evaporating pressure.

13. Water pump

The water pump primes the water from the sumpto the water distributor tube and through thedistributing holes it cascades down onto theevaporator cells by gravity so to be frozen intoclear ice cubes. The water pump remains offduring the first 30" seconds of the freezing cycle(to avoid any cavitation problem) while it's keptrunning during the first 40" of defrost/harvestcycle to drain out (purge) the remaining waterfrom the sump (reach in mineral salts).

14. Water inlet solenoid valve - 3/4" malefitting

The Water Inlet Solenoid valve is energised bythe P.C. Board during the beginning of the freezingcycle till the water reaches the maximum levelinto the sump (controlled by the Water LevelSensor).After 3 minutes, from the start up of the freezingcycle, the Water Inlet Valve is energised again fora short period to re-fill the sump with water till

4. Ice Thickness SensorLocated in the front upper right side off theevaporator, the sensor is made with two metalreeds in which passes power at low voltage. Thetwo metal reeds, which are individually insulated,are set, through a setting screw, to maintaina minimum clearence from the evaporator(3÷5 mm). Once ice is formed into each mold andis thick enough to fill-up that minimum clearanceexisting between the two sensor reeds and theevaporator, the water that cascades over the icehas gradually approached to make contactbetween the two sensor reeds.It is enough that this contact remains there forabout 10 seconds that the P.C. Board receivesthe signals to put the ice machine on defrost.

5. Magnetic SwitchLocated in the front of the evaporator plasticcurtain, this switch sends a pulse to the P.C.Board which switches the machine back in thefreezing cycle.

6. Hot Gas Solenoid ValveThe Hot Gas Solenoid Valve functions only duringthe Harvest Cycle, to divert the hot discharge gasfrom the Compressor, bypassing the Condenden-ser and thermostatic expansion valve, for directflow to the Evaporator Platen Assembly to releaseice cubes from the ice cube molds.The Hot Gas Solenoid Valve is comprised of twoparts, the Body & Plunger and the Coil assembles.Installed in the discharge line of the Compressor,the energized solenoid coil lifts the valve stemwithin the valve body to cause the hot discargegas to be diverted when the ice Thickness sensorhas signalled to the P.C. Board to start theHarvest Cycle.

7. Condenser temperature sensorThe condenser temperature sensor probe(located in contact with the condenser tube coil)detects the condenser temperature variationsand signals them by supplying current, at lowvoltage, to the P.C. BOARD.In the air cooled versions, in relation to thedifferent current received, the micro processor ofthe P.C. BOARD supplies, through a TRIAC, thepower at high voltage to the fan motor so to coolthe condenser and to reduce its temperature.In case the condenser temperature rises andreaches 65°C (150°F) the current arriving to themicro processor is such to cause an immediateand total stop of the machine operation with theblinking of the Red LED.

8. High Pressure ControlThe high Pressure Control, a safety control, isfactory set to cut-out, at 30 bar and cut-in at 22bar. The control, functions as a precautionarydevice to shut OFF electrical power to Icemaker,should a loss of water occur to the water cooledCondenser or a burnt out of the fan motor on aircooled versions. The high Pressure Control ismanual reset with reset button located on the

again to the max. level so to minimise anypossibility of slush ice formationA flow control, fitted into its outlet port, reducesthe pressure of the water flow.

15. Water level sensorThe Water Level Sensor, located on the upperright side of the water sump, works in conjunctionwith the P.C. Board in order to control the waterlevel at beginning of the freezing cycle by receivinga low power current passing through the water.When the current reaches the PC Board, thewater inlet solenoid valve is de-energised.In case the PC Board doesn’t receive any signal(current) from the Water Level Sensor within thefirst 3 minutes of the freezing cycle, the PC Boardtrips OFF the operation of the machine with theswitching ON of the Water Error LEDs.

16. Start up delay PC BoardLocated in the back side of the unit it delays thestart up of the entire machine by 2 hours so toavoid that compressor can start up w/out bepre-heated.

17. Start up delay PC Board by-pass switchLocated in the back side of the machine allows toby-pass the delay time controlled by the delayPC Board.

WARNING. It is IMPERATIVE to by-passthe delay time only when sure of properwarm up of compressor.

MV 300/450/600/1000 - WIRING DIAGRAM220 V. 50 Hz. 1 ph.

A - Input terminal boardB - Compressor contactorC - CompressorD - Ice sensorE - End defrosting switchF - Water level sensorG - Condenser temperature probeH - Led cardI - PC BoardJ - Hi pressure switch

K - Manual/Automatic reset jumperL - Water pumpM - Water inlet valveN - Water drain/purge valveO - Hot gas valveP - Fan Motor (only AIR cooled unit)Q - Fan Motor (only WATER cooled unit)RC - Compressor relayCS - Start capacitorCM- Run capacitor

m = brownbc = light bluegv = yellow greenb = whiten = blackr = reda = orange

MV 1000 - WIRING DIAGRAM400 V. 50 Hz. 3 ph.

A - Input terminal boardB - Compressor remote control switchC - CompressorD - Ice sensorE - End defrosting switchF - Water level sensorG - Condenser temperature probeH - Led cardI - Electronic cardJ - Max pressure switch

K - Automatic reset switchL - Water pumpM - Water inlet valveN - Water discharge valveO - Hot gas valveP1- Fan Motor 1 (only AIR cooled unit)P2- Fan Motor 2 (only AIR cooled unit)R - Cranckase heaterS - Delay by pass switchT - Start delay electronic board

m = brownbc = light bluegv = yellow greenb = whiten = blackr = reda = orangev = purple

SYMPTOM POSSIBLE CAUSE CORRECTION

Warning Red LED ON See page 20 See page 20

No warning LED/LIGHT ON P.C. Board inoperative. Remove board and check.

No power to unit. Check electrical source.

Bin full Yellow LED ON Bin Full of ice. Nome.

Magnetic switch inoperative. Check and replace.

Machine runs, compressor P.C. Board compressor Test and replace.does not. relay open.

Compressor contactor open. Test and replace.

Compressor relay open. Test and replace.

Compressor winding open. Test and replace.

Machine runs, makes ice, Ice thickness control open. Check sensor fingersdoes not try to harvest. if are not covered

with scale sediment.

Too soft water. Water electrical conductivitymust be higher then 20 µS.Machine can't run withdemineralized water.

Built-in relay on Check and replace P.C. Board.P.C. Board open.

Machine runs, makes Low refrigerant charge. Check system for correct refr. charge.and harvests ice Check for leak weight in charge.but very slowly.

Low ice capacity. High discharge pressure Evacuate and weighdue to not-condensable in charge.or overcharge.

Inefficient compressor. Replace.

Condenser dirty. Clean.

Low water flow Check and repair.(Water-cooled).

High air temperature Check temperature of air(air-cooled). entering condenser.

Machine makes irregular ice. Plugged water distributor. Clean water distributor.

TXV supertheat wrong. Adjust or replace.

Refrigerant charge low. Adjust-check for leak.recharge.

SERVICE DIAGNOSISThe table below is intended as a quick referenceto aid the Service Agent in determining the causeof a particular type of malfunction, as well as therecommended repair. It is not intended to be anexclusive list.

Reference to other portions of this manual,inclusing wiring diagrams, installation, andoperation are recommended to better determinethe cause of a problem.

MAINTENANCE & CLEANING & SANITATION INSTRUCTIONS

A SCOTSMAN Ice System represent a sizableinvestment of time and money in any company’sbusiness. In order to receive the best return forthat investment, in MUST receive periodicmaintenance.It is the USER’S RESPONSIBILITY to see thatpreferable, and less costly in the long run, toavoid possible down time by keeping it clean,adjusting it as needed and by replacing wornparts before they can cause failure. The followingis a list of recommended maintenance that willhelp keep your machine running with a minimumof problems.Maintenance and Cleaning should be scheduledat MINIMUM twice per year while sanitation onceper month.

ICEMAKER

THE FOLLOWING MAINTENANCE SHOULDBE SCHEDULED AT LEAST TWO TIMES PERYEAR ON THIS ICEMAKER. CALL YOURAUTHORIZED SCOTSMAN SERVICEAGENCY.

1. Check and clean or service any optionalwater treatment devices, if any installed.

2. Clean water strainer.

3. Check that the cabinet is level, in the side-to-side and front-to-back directions.

4. Clean/Sanitise the water system, evaporatorplate and sump assembly, using a solution ot IceMachine Cleaner/Sanitiser. Refer to CLEANING -Icemaker.

NOTE: Cleaning/Sanitising requirementsvary according to local water conditions andindividual user operation.Continuous check of the clarity of ice cubesand visual inspection of the water systemparts, evaporator plates and the sumpassembly before and after cleaning will indi-cate frequency and procedure to be followedin local areas.

5. Check and tighten all bolts and screws.

6. Check for water leaks and make corrections.

7. Check the bin control to test shut-off.Holding the evaporator deflector in open Positionfor more that 30", shold cause the ice maker toshut-off.Once the evaporator deflector is released in itsclosed position, the ice maker will restart.

8. Check cube size, adjust if required throughsetting screw of ice thickness control sensor.

9. With unit out of operation, clean thecondenser using vacuum, cleaner, wisk broomor brush.Instruct customer to clean condenser frequentlyDO NOT USE A WIRE BRUSH.

ICE STORAGE BIN

The interior liner of the bin is in contact with a foodproduct, ice, and should be cleaned and sanitisedregularly. Once a week sanitise it with acommercial food grade sanitiser compling withthe manufacturer dilution.

CABINET EXTERIOR

Wipe clean unit and bin cabinet exterior with aclean cloth or disposable paper wipers, soakedin warm water with mild detergent solution.

CLEANING - Ice maker

WARNING - Ice Machine Cleaner containsPhosphoric and Hydroxyacetic acids.These compounds are corrosive and maycause burns. If swallowed, DO NOT indu-ce vomiting. Give large amounts of wateror milk. Call physician immediately. Incase of sxternal contact, flush with water.KEEP OUT OF THE REACH OF CHILDREN.

1. Empty bin of ice.

2. Remove front panel.

3. Wait till the end of the defrost/harvest cyclethen push the RESET BUTTON for 6-8 seconds.The machine should stop with the blinking of theYellow LED (slow blink).

4. Pour on- MV 300 150 cc- MV 450-600 250 cc- MV 1000 350 ccof Scotsman Ice Machine Clea-ner directly intothe reservoir then push again the RESETBUTTON for a while. The water pump starts tooperate with the fast blinking of the Yellow LEDwhile the water inlet valve will be energized till thefill up of the water sump.

5. After 15 minutes push the RESET BUTTONfor a while. The P.C. Board put the machine inautomatic rinsing mode with the special blinking(blink twice and repeat) of the Yellow LED.

NOTE: RINSING mode consists of:a) energize the water drain valve and the

water pump for 40 seconds to empty thereservoir

b) deenergize the water drain valve and thewater pump for 1 minute

c) energize the water inlet valve till the fill upof the water sump

d) energize the water pump for 1,5 minutes.The above sequence is repeted 7 times so tobe sure to have removed any possible traceof Ice Machine Cleaner.

6. At the end of the 7th Rinsing cycle the P.C.Board stops the operation of the machine withthe blinking (slow) of the Yellow LED.

7. Pushing the RESET BUTTON for 6-8seconds the machine restarts in the freezingcycle.

8. Replace the evaporator cover deflector andfront panel.

9. Check the next batch of cubes to be sure allthe cleaner is gone (no sour taste).

CAUTION - DO NOT use ice cubesproduced from the cleaning solution. Besure none remains in the bin.

10. Pour hot water into the storage bin melt thecubes, and to also clean the bin drain.

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