Servicemanual AC 46-56-86

SERVICE MANUAL

AC 46AC 56AC 86

Cuberswith storage

MS 1000.86 REV. 02/2006

INDICE2357

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Table of contents pageSpecifications AC 46Specifications AC 56Specifications AC 86

GENERAL INFORMATION AND INSTALLATION

IntroductionUnpacking and InspectionLocation and levellingElectrical connectionsWater supply and drain connectionsFinal check listInstallation practice

OPERATING INSTRUCTIONS

Start upOperational checks

OPERATING PRINCIPLES (How it works)

Freezing cycleHarvest cycleElectrical sequenceComponents description

ADJUSTMENT, REMOVAL AND REPLACEMENT PROCEDURES

Adjustment of the cube sizeWiring diagramService diagnosis

MAINTENANCE AND CLEANING INSTRUCTIONSGeneralIcemakerClean - Replace of air condenser filterCleaning instructions of water system

181920

Important operating requirements:

Air temperatureWater temperatureWater pressureElectr. voltage variationsfrom voltage ratingspecifiedon nameplate

MIN.10°C 5°C1 bar

-10%

°C°F

SPECIFICATIONS

CUBER MODEL AC 46

NOTE. With the unit in "built-in" conditions, the ice production is gradually reduced in respect to thelevels shown in the graf, up to a maximum of 10% at room temperatures higher than 32°C.The daily ice-making capacity is directly related to the condenser air inlet temperature, watertemperature conditions of the condenser air filter and age of the machine.To keep your SCOTSMAN CUBER at peak performance levels, periodic maintenance checks mustbe carried out as indicated on Maintenance and Cleaning section of this manual.

MAX.40°C35°C5 bar

+10%

ice making capacity

25

24

23

22

21

20

19

18

17

16

Kg.

32 27 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

. 10

21

32

38

WATER COOLED MODELS

°Co

°Co

25

24

23

22

21

20

19

18

17

16

Kg.

32 27 21 15 10

10

21

32

38

°Co

°Co

WATER TEMPERATURE

AM

BIE

NT

TE

MP

ER

AT

UR

E

ICE

PR

OD

UC

ED

PE

R 2

4 H

RS

.

AC 46 AS 6 AirAC 46 WS 6 Water Stainless steel 1/4 9 Kg.

Start . Electric power cons.Amps Kwh per 24 Hr

Model Cond. unit Finish Comp. HP

SPECIFICATIONS

Basic electr. Amps Watts Nr. of wires Amps fuse

230/50/1 2.1 12 400 3 x 1.5 mm2 108

6

AC 46 - CUBERmachine specifications

Cubes per harvest: 18 medium* A 15°C water temperature

Dimensions:

HEIGHT 645 mm.WIDTH 386 mm.DEPTH 600 mm.WEIGHT 42 Kgs.

77*350*

Bin Water req. Capacity lt/24 HR

MIN.10°C 5°C1 bar

-10%



SPECIFICATIONS

CUBER MODEL AC 56

MAX.40°C35°C5 bar

+10%

ice making capacity


32

30

28

26

24

22

20

18

Kg.

32 27 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

.

1021

32

38

WATER COOLED MODELS

°Co

°Co

33

32

31

30

29

28

27

26

25

24

23

Kg.

10

2132

38

°Co

AM

BIE

NT

TE

MP

ER

AT

UR

E

ICE

PR

OD

UC

ED

PE

R 2

4 H

RS

.

32 27 21 15 10

WATER TEMPERATURE

°Co

AC 56 AS 6 AirAC 56 WS 6 Water

Stainless steel 1/4 12.5 Kg.



SPECIFICATIONS


230/50/1 2.1 12 400 3 x 1.5 mm2 10

0 90 **270*



Dimensions:

HEIGHT 695 mm.WIDTH 386 mm.DEPTH 600 mm.WEIGHT 45 Kgs.

7.6

7


MIN.10°C 5°C1 bar

-10%



SPECIFICATIONS

CUBER MODEL AC 86

MAX.40°C35°C5 bar

+10%

ice making capacity


38

37

36

35

34

33

32

31

30

29

28

27

26

25

24

Kg.

32 27 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

.

10

21

32

38

WATER COOLED MODELS

°Co

°Co

39

38

37

36

35

34

33

32

31

30

29

Kg.

10

21

3238

°Co

AM

BIE

NT

TE

MP

ER

AT

UR

E

ICE

PR

OD

UC

ED

PE

R 2

4 H

RS

.

32 27 21 15 10

WATER TEMPERATURE

°Co

Stainless steel 3/8 19 Kg.



SPECIFICATIONS


230/50/1 3.3 18 480 3 x 1.5 mm2 10

0143 **500*



Dimensions:

HEIGHT (without legs) 795 mm.HEIGHT (with legs) 915 mm.WIDTH 530 mm.DEPTH 600 mm.WEIGHT 45 Kgs.

8.9

8.4


AC 86 AS 6 AirAC 8 6 WS 6 Water

8. Use clean damp cloth to wipe the surfacesinside the storage bin and the outside of thecabinet.

9. See data plate on the rear side of the unitand check that local main voltage correspondswith the voltage specified on it.

CAUTION. Incorrect voltage supplied tothe icemaker will void your partsreplacement program.

10. Remove the manufacturer’s registrationcard from the inside of the User Manual and fill-in all parts including: Model and Serial Numbertaken from the data plate.Forward the completed self-addressedregistration card to Frimont factory.

11. If necessary, on model AC 56, replace thefour standard legs with the taller ones supplied inthe machine and adjust them to level the unit.

C. LOCATION AND LEVELLING

WARNING. This Ice Cuber is designed forindoor installation only. Extended periodsof operation at temperatures exceedingthe following limitations will constitutemisuse under the terms of the SCOTSMANManufacturer’s Limited Warranty resultingin LOSS of warranty coverage.

1. Position the unit in the selected permanentlocation.Criteria for selection of location include:

a) Minimum room temperature 10°C (50°F)and maximum room temperature 40°C (100°F).

b) Water inlet temperatures: minimum 5°C(40°F) and maximum 35°C (90°F).

c) Well ventilated location for air cooledmodels.

d) Service access: adequate space mustbe left for all service connections through the rearof the ice maker. A minimum clearance of 15 cm(6") must be left at the sides of the unit for routingcooling air drawn into and exhausted out of thecompartment to maintain proper condensingoperation of air cooled models.

2. Level the unit in both the left to right andfront to rear directions.

D. ELECTRICAL CONNECTIONS

See data plate for current requirements todetermine wire size to be used for electricalconnections. All SCOTSMAN icemakers requirea solid earth wire.

A. INTRODUCTION

This manual provides the specifications and thestep-by-step procedures for the installation, start-up and operation, maintenance and cleaning forthe SCOTSMAN AC series icemakers.These Cubers are quality designed, engineeredand manufactured.Their ice making systems are thoroughly testedproviding the utmost in flexibility to fit the needsof a particular user.These icemakers have been engineered to ourown rigid safety and performance standards.

NOTE. To retain the safety and performancebuilt into this icemaker, it is important thatinstallation and maintenance be conductedin the manner outlined in this manual.

B. UNPACKING AND INSPECTION

1. Call your authorized SCOTSMAN Distributoror Dealer for proper installation.

2. Visually inspect the exterior of the packingand skid. Any severe damage noted should bereported to the delivering carrier and a concealeddamage claim form filled in subjet to inspection ofthe contents with the carrier’s representative present.

3. a) Cut and remove the plastic strip securingthe carton box to the skid.

b) Cut open the top of the carton and removethe polystyre protection sheet.

c) Pull out the polystyre posts from thecorners and then remove the carton.

4. Remove the front panel of the unit andinspect for any concealed damage. Notify carrierof your claim for the concealed damage as stetedin step 2 above.

5. Check that refrigerant lines do not rubagainst or touch other lines or surfaces, and thatthe fan blade moves freely.

6. Check that the compressor fits snugly ontoall its mounting pads.

7. Remove all internal support packing andmasking tape.

GENERAL INFORMATION AND INSTALLATION

All SCOTSMAN ice machines are supplied fromthe factory completely pre-wired and require onlyelectrical power connections to the wire cordprovided at rear of the unit.Make sure that the ice machine is connected toits own circuit and individually fused (see dataplate for fuse size).The maximum allowable voltage variation shouldnot exceed -10% and + 10% of the data platerating. Low voltage can cause faulty functioningand may be responsible for serious damage tothe overload switch and motor windings.

NOTE. All external wiring should conform tonational, state and local standards andregulations.

Check voltage on the line and the ice maker’sdata plate before connecting the unit.

E. WATER SUPPLY AND DRAINCONNECTIONS

GENERAL

When choosing the water supply for the ice cuberconsideration should be given to:

a) Length of runb) Water clarity and purityc) Adequate water supply pressure

Since water is the most important single ingredientin producting ice you cannot emphasize toomuch the three items listed above.Low water pressure, below 1 bar may causemalfunction of the ice maker unit.Water containing excessive minerals will tend toproduce cloudy coloured ice cubes, plus scalebuild-up on parts of the water system.

WATER SUPPLY

Air Cooled VersionsConnect the 3/4" male fitting of the solenoidwater inlet valve, using the flexible tube supplied,to the cold water supply line with regular plumbingfitting and a shut-off valve installed in anaccessible position between the water supplyline and the unit.If water contains a high level of impurities, it isadvisable to consider the use an appropriatewater filter or conditioner.

Water Cooled VersionsOn Water Cooled version the water inlet solenoidvalve has two separate outlets one for thecondenser and the second for the production ofice.

WATER DRAIN

The recommended drain tube is a plastic orflexible tube with 18 mm (3/4") I.D. which runs toan open trapped and vented drain.

WATER DRAIN - WATER COOLED MODELS

Connect the 3/4" male fitting of the condenserwater drain, utilizing a second flexible hose, tothe open trapped and vented drain.

NOTE. The water supply and the water drainmust be installed to conform with the localcode. In some case a licensed plumber and/or a plumbing permit is required.

F. FINAL CHECK LIST

1. Is the unit in a room where ambienttemperatures are within a minimum of 10°C(50°F) even in winter months?

2. Is there at least a 15 cm (6") clearancearound the unit for proper air circulation?

3. Is the unit level? (IMPORTANT)

4. Have all the electrical and plumbingconnections been made, and is the watersupply shut-off valve open?

5. Has the voltage been tested and checkedagainst the data plate rating?

6. Has the water supply pressure beenchecked to ensure a water pressure of atleast 1 bar (14 psi).

7. Check all refrigerant lines and conduitlines to guard against vibrations and possiblefailure.

8. Have the bolts holding the compressor downbeen checked to ensure that the compressor issnugly fitted onto the mounting pads?

9. Have the bin liner and cabinet been wipedclean?

10. Has the owner/user been given the UserManual and been instructed on the importance ofperiodic maintenance checks?

11. Has the Manufacturer’s registration cardbeen filled in properly? Check for correct modeland serial number against the serial plate andmail the registration card to the factory.

12. Has the owner been given the name and thephone number of the authorized SCOTSMANService Agency serving him?

G. INSTALLATION PRACTICE

1. Hand shut-off valve

2. Water filter

3. Water supply line (flexible hose)

4. 3/4" male fitting

5. Vented drain

6. Open trapped vented drain

7. Drain fitting

8. Main switch

9. Power line

WARNING. This icemaker is not designed for outdoor installation and will not function inambient temperatures below 10 °C (50°F) or above 40 °C (100°F).This icemaker will malfunction with water temperatures below 5 °C (40°F) or above 35 °C(90°F).

1

2 3

45

6

7

8

9

OPERATING INSTRUCTIONS

START UP

After having correctly installed the ice maker andcompleted the plumbing and electricalconnections, perform the following “Start-up” pro-cedure.

A. Withdraw the condenser air filter thenremove the unit front panel and locate the cleaningswitch on the control box.

B. Set the cleaning switch in the cleaningposition. This will close the electrical circuit to thewater inlet valve and to the hot gas valve

C. Switch ON the power line disconnect switchand push the green button switch. Unit will startup in charging cycle mode. During this cycle thecomponents energized are:

WATER INLET SOLENOID VALVE

HOT GAS SOLENOID VALVE

The Water pump and the Fan motor in the aircooled versions, are also in operation.

D. Let unit stay in charging cycle for aboutthree/four minutes till water is coming out fromthe drain hose, then move the cleaning switch tothe operation position.

NOTE. During the charging cycle, the waterinlet solenoid valve is energized. The waterflows through the valve to the back side of theevaporator platen and then down to fill up theicemaker sump for the next freezing cycle.

OPERATIONAL CHECKS

E. The unit now starts its first freezing cyclewith the following components in operation:

COMPRESSOR

WATER PUMPFAN MOTOR in air cooled version

F. Check to see through the ice dischargeopening that the spray system is correctly seatedand that the water jets uniformely reach theinterior of the inverted cup molds; also make surethat the plastic curtain is hanging freely and thereis not excessive water spilling through it.

G. The ice making process takes placethereby, with the water sprayed into the moldsthat gets gradually refrigerated by the heatexchanged with the refrigerant flowing into theevaporator serpentine.

H. When the evaporator temperature reachesa preset value the evaporator thermostat or cubesize control changes its contacts; the freezingcycle ends and starts the defrost or harvestcycle.Freezing time will range between 20 and 22minutes in a 21°C ambient temperature. Longertime for temperature above, shorter when below.Average complete cycle range is about 23 to 25minutes.

I. Check, during the first defrost/harvestcycle, that the incoming water flows correctlyinto the sump in order to re-fill it and the surplusoverflows through the overflow drain tube.

J. Check the texture of ice cubes justreleased. Right size must have a small depression(about 5-6 mm) in their crown.If not, wait for the second defrost/harvest cyclebefore performing any adjustment.

K. If required, the length of the freezing cyclecan be modified by turning the knob of the cubesize control or evaporator thermostat located infront of the control box until the desired size isachieved.If the ice cubes are shallow and cloudy, it ispossible that the ice maker runs short of waterduring the end of the freezing cycle or, the qualityof the supplied water requires the use of anappropriate water filter or conditioner.

L. During the defrost or harvest cycle hold ahandful of ice cubes against the bulb of thestorage bin thermostat; the icemaker switch OFFin about one-two minutes.Take out the ice from the storage bin thermostat.The ice maker should restart automatically inthree-four minutes.

NOTE. The bin thermostat is factory set at1°C (35°F) OUT and 4°C (39°F) IN.

M. Re-fit the unit front panel then instruct theowner/user on the general operation of the icemachine and about the cleaning and care itrequires.

Page 13

COMPONENTS DESCRIPTION

A. WATER PUMP

The water pump operates continually throughoutthe freezing cycle.The pump primes the water from the sump to thespray system and through the spray nozzlessprays it into the inverted cup molds to be frozeninto crystal clear ice cubes.

B. WATER INLET SOLENOID VALVE -3/4 MALE FITTING

The water inlet solenoid valve is energized onlyduring the defrost cycle.When energized it allows a metered amount ofincoming water to flow over the evaporator cavityto assist the hot gas in defrosting the ice cubes.The water running over the evaporator cavitydrops by gravity, through the dribbler holes of theplaten, into the sump.On water cooled versions the water inlet solenoidvalve has one inlet and two outlets with twoseparate solenoids energized the first (iceproductioon) by the contacts 3-2 of the evaporatorthermostat and the second (water cooledcondenser) by a specific hi pressure control.

C. HOT GAS SOLENOID VALVE

The hot gas solenoid valve consists basically intwo parts: the valve body and the valve coil.Located on the hot gas line, this valve is energizedby the contacts 3-2 of the evaporator thermostatduring the defrost cycle.During the defrost cycle the hot gas valve coil isactivated so to attract the hot gas valve piston inorder to give way to the hot gas discharged fromcompressor to flow directly into the evaporatorserpentine to defrost the formed ice cubes.

D. BIN THERMOSTAT

The bin thermostat control body is located in thefront of control box behind the front louveredpanel.The thermostat sensing tube is located into abulb holder on the side wall of the ice storage binwhere it automatically shuts the icemaker OFFwhen in contact with the ice and re-starts theicemaker when the ice is removed. Factorysettings are 1°C (35°F) OUT and 4°C (39°F) IN.

E. CUBE SIZE CONTROL (EVAPORATORTHERMOSTAT)

The cube size control (evaporator thermostat)body is located in the front of control box behindthe front louvered panel; it’s basically a reverseacting temperature control which closes thecontacts 3-2 when its temperature decreasesand closes the opposite contacts 3-4 when thetemperature rises.

OPERATION - ELECTRICAL SEQUENCEThe following charts illustrate which switchesand components are ON or OFF during the twophases of the icemaking cycle.Refer to the wiring diagram for reference.

FREEZING CYCLE

Electrical components ON OFF

Compressor ............................................ •Water Pump ........................................... •Fan Motor (Air cooled only) .................... •Hot Gas Valve ........................................ •Inlet Water Valve .................................... •Electrical Controls CLOSE OPEN

Evaporator Thermostat (contacts 3-4) ... •Evaporator Thermostat (contacts 3-2) ... •Bin Thermostat ....................................... •

HARVEST CYCLE

Electrical components ON OFF

Compressor ............................................ •Water Pump ........................................... •Fan Motor (Air cooled only) .................... •Hot Gas Valve ........................................ •Inlet Water Valve .................................... •

Electrical Controls CLOSE OPEN

Evaporator Thermostat (contacts 3-4) ... •Evaporator Thermostat (contacts 3-2) ... •Bin Thermostat ....................................... •

Freeze Cycle

Average Discharge PressureA/C: 7 ÷ 11 bars (100÷155 psig)

Average Discharge PressureW/C: 8.5 ÷ 10 bars (120÷140 psig)

Suction PressureEnd Freeze Cycle: 0 ÷ 0.1 bar (0 ÷ 1.5 psig)

REFRIGERANT METERING DEVICE:capillary tube

REFRIGERANT CHARGE (R 134 A)

Model Air cooled Water cooled

AC 46 260 gr ( 9.5 oz.) 250 gr (9.0 oz.)AC 56 260 gr ( 9.5 oz.) 250 gr (9.0 oz.)AC 86 280 gr (10.0 oz.) 250 gr (9.0 oz.)

The thermostat sensing bulb is located into aplastic tube (bulb holder) secured by two clipsdirectly to the evaporator serpentine.This control determines the length of the freezingcycle and correspondingly the size of the cubes.A lower setting will produce a larger cube(oversize) while a higher setting a smaller cuber(shallow size).When closed on contacts 3-2 it activates thedefrost or harvest cycle components.The cube size control is set up in the factory(knob in the black dot position) and doesn'trequire any adjustment when the ambienttemperature remains between 15 and 30°C(60 and 90°F).

F. FAN MOTOR (Air cooled version)

The fan motor is electrically connected in parallelto the water pump and it operates continuouslyonly during the freezing cycle keeping the properhead pressure by circulating air through thecondenser fins.

G. COMPRESSOR

The hermetic compressor is the heart of therefrigerant system and it is used to circulate andretrieve the refrigerant throughout the entiresystem. It compresses the low pressurerefrigerant vapor causing its temperature to riseand become high pressure hot vapor (hot gas)which is then released through the dischargevalve.

H. WATER SPRAY SYSTEM

Through its nozzles it sprays the water in eachindividual cup to be frozen into ice.

I. CLEANING SWITCH

Located on the bottom side of the control box isused to energize the water inlet and the hot gasvalves so to charge the water into the sump of themachine when neaded.

J. HI PRESSURE CONTROL (Water cooledversion)

Used only on the water cooled versions it operatesto keep between 8.5 and 10 bars (120 ÷ 140 psig)the hi-side or discharge pressure of the refrigerantsystem by energizing the coil of the water inletsolenoid valve that control the cooling water flowto the condenser.

K. GREEN MASTER SWITCH PUSHBUTTON

Located in the front of the machine it’s used toswitch ON and OFF the unit by pushing its greenpush button. When ON, its green light is ON aswell.

L. RED ALARM/RE-SET PUSH BUTTON

Located in the front of the machine (just besidethe Master Switch) it works in conjuction with theCleaning Remind Board and it’s activated when:• Consensing temperature is higher then 70°C

(air cooled version) - ON steady with machinein OFF mode

• Condensing temperature is higher then 60°C(water cooled version) - ON steady withmachine in OFF mode

• Condenser sensor out of order - Blinkingtwice and repeat with machine in OFF mode

• Condenser air filter need to be cleaned - ONsteady with machine in ON mode

• Water system need to be cleaned - Slowblinking with machine in ON mode.

On the first two cases it’s possible to Re-Set theoperation of the machine pushing and hold theRed Alarm Re-Set Button by 5" till the Red Lightis OFF.

On the third case, it’s necessary first to replacethe condenser sensor then, push and hold for 5"the Red Re-Set Button.

M. CLEANING REMIND PC BOARD

Located on the front left side of the machine, itworks in conjuction with the condenser sensorand the Red Alarm Re-Set Push Button.

It consists of a Printed Circuit Board with a stepdown transformer (230V - 12V), a relay, a DipSwitch with two keys, a Jumper for the set up ofthe Cut OFF/Alarm condensing temperature(70°C - jumper OUT - for air cooled version and60°C - jumper IN - for water cooled version), agreen four contacts connector for power IN andOUT, a Red socket for the Water Level Sensor(future use on EC series only), a Black socket forthe Condenser Sensor and a White socket for theRed Alarm Re-Set Push Button.

The main function of this PC Board is to switchOFF the machine when the condensing tempe-rature is higher of its setting value or signal outthe need for the cleaning of the condenser airfilter (air cooled only) or of the water system.

The time between the signal out for the cleaningof the water system can be modified according tothe setting of the two Dip Switches as below:

TIME 1 2

1 MONTH ON ON

3 MONTHS OFF ON

6 MONTHS ON OFF

1 YEAR OFF OFF

Once cleaned the water system, it’s necessary tocancel the time stored into the PC Board by

pushing and hold for more then 20" the RedAlarm Re-Set Button till it starts to blink.

N. CONDENSER AIR FILTER(Air cooled version)

Located in front of the air cooled condenser canbe removed by withdrawing it through the openingof the front panel for cleaning or replacing.A lower plastic guide, installed inside the unit, isused for the correct sliding and location of the airfilter.

O. CONDENSER SENSOR

The condenser temperature sensor probe,located within the condenser fins (air cooledversion) or in contact with the tube coil (watercooled version) detects the condenser tempe-rature variations and signals them by supplyingcurrent, at low voltage, to the P.C. BOARD.In case the condenser temperature rises andreaches 70°C (160°F) - on air cooled models - or60°C (140°F) - on water cooled models - thecurrent arriving to the micro processor is such tocause an immediate and total stop of the machineoperation.

WIRING DIAGRAM

AC 46 - AC 56 - AC 86 / AIR AND WATER COOLED 230/50-60/1The unit is shown on freezing cycle

ONLY FOR WATER COOLED VERSION

ONLY FOR AIR COOLED VERSION

SYMPTON POSSIBLE CAUSE SUGGESTED CORRECTION

Unit will not run Blown fuse Replace fuse & check for cause ofblown fuse.

Main switch in OFF position Turn switch to ON position

Bin thermostat set improperly Adjust rotating its setting screw

Loose electrical connections Check wiring

Red Alarm light ON Too Hi Condensing Temperature Reset the machine (Push & holdthe Reset Buttom for 5") and checkfor reason why

Red Alarm light Blinking Twice Condenser sensor out of order Replace itand repeat

Compressor cycles intermittently Low voltage Check circuit for overloadingCheck voltage at the supply to thebuilding. If low, contact the powercompany

Non-condensable gas in system Purge the system

Dirty condenser Clean with vacuun cleaner, air orstiff brush. (DO NOT use wire brush).

Air circulation blocked Allow sufficient air space allaround unit.

Compressor starting device with Check for loose wires in startingloose wires device.

Cubes too small Cube size control set improperly Check and adjust for properoperation.

Capillary tube partially restricted Blow charge, add new gas & drier,after evacuating system withvacuum pump.

Moisture in the system Same as above.

Shortage of water See remedies for shortage of water.

Shortage of refrigerant Check for leaks & recharge.

Cloudy cubes Shortage of water See remedies for shortage of water.

Dirty water supply Use water softner or water filter.

Accumulated impurities Use SCOTSMAN Ice Machinecleaner.

Shortage of water Water spilling out through curtain Check or replace curtain.

Water solenoid valve not opening Replace valve.

Water leak in sump area Locate and repair.

Water flow control plugged Remove and clean.

SERVICE DIAGNOSIS

SYMPTON POSSIBLE CAUSE SUGGESTED CORRECTION

Irregular cubes size & Some jets plugged Remove jet cover and clean.some cloudy

Shortage of water See shortage of water.

Unit not levelled Level as required.

Poor pumping Check and/or replace the water pump.

Cubes too large Cube size control set improperly Check and adjust for proper operation.

Decreased ice capacity Inefficient compressor Replace.

Leaky water valve Repair or replace.

Non-condensable gas in system Purge the system.

Poor air circulation or excessive Relocate the unit or provide forhot location more ventilation.

Overcharge of refrigerant Correct the charge. Purge off slowly.

Capillary tube partially restricted Blow charge, add new gas & drier,after evacuating system withvacuum pump.

Undercharge of refrigerant Charge to data plate indication.

Discharge head pressure too high See incorrect discharge pressure.

Clogged air filter Clean or replace.

Poor harvest Restriction in incoming water line Check water valve strainer and flowcontrol. If necessary enlarge theflow control orifice.

Too short defrost time Check temperature control.Replace if necessary.

Cube size control set for too large Re-set cube size control.cubes

Water inlet valve not opening Valve coil with open winding.Replace valve.

Hot gas valve orifice restricted Replace hot gas valve assy.

Air vented holes in mold cups plugged Clean out holes.

Discharge head pressure too low See incorrect discharge pressure

Unit won't harvest Inoperative cube size control Replace cube size control

Hot gas valve not opening Valve coil with open winding.Replace valve.

Water solenoid valve not opening Valve coil with open winding.Replace valve.

Incorrect discharge pressure Dirty air filter Clean or replace.

Inoperative hi press control Replace.(Water cooled)

Water inlet valve to condenser Clean or replace.partially clogged

Excessive water in unit base Water tubing leaking Check. Tighten or replace.

SERVICE DIAGNOSIS

MAINTENANCE AND CLEANING INSTRUCTIONS

A. GENERAL

The periods and the procedures for maintenanceand cleaning are given as guides and are not tobe construed as absolute or invariable.Cleaning, especially, will vary depending uponlocal water and ambient conditions and the icevolume produced; and, each icemaker must bemaintened individually, in accordance with itsparticular location requirements.

B. ICEMAKER

The following maintenance should be scheduledat least two times per year on these icemakers.

1. Check and clean the water line strainer.

2. Check that the icemaker is levelled in sideto side and in front to rear directions.

3. Check for water leaks and tighten drain lineconnections. Pour water down bin drain line to besure that drain line is open and clear.

4. Check size, condition and texture of icecubes. Perform adjustment of cube size controlas required.

5. Check the bin thermostat to test shut-off.Put a showelfull of ice cubes in contact with thebin thermostat bulb for at least one minute.This should cause the ice maker to shut off.

Within few seconds after the removal of theahowelfull of ice from bin thermostat bulb, theicemaker restarts.

NOTE. Within minutes after the ice is removedfrom the bulb holder tube, the sensing bulbinside the tube will warm up and cause theicemaker to restart. This control is factory setand should not be reset until testing isperformed.

6. Check for refrigerant leaks.

NOTE. The new AC 46 & AC 56 series, in theair cooled version, are standard equippedwith an air condenser filter as well as aCleaning Reminder Board to remind to theend user the need for the cleaning of the airfilter or of the water system (Red Alarm LightON Steady or Blinking rispectively withmachine in operation).

C. CLEAN - REPLACE OF AIRCONDENSER FILTER

1. Withdraw the air filter from the front throughthe opening of the front panel.

2. Blow pressurised air on the opposite directionof the condenser air flow so to remove thedust accumulated.

3. If pressurised air is not available, use tapwater always in the counter flow air diretcion.Once cleaned shake it so to remove most ofthe accumulated water, then dry it using anhair dryer.

NOTE. In case the air filter strainer is damagedreplace it with a new one.

4. Install it again by pushing it through the frontpanel opening.

D. CLEANING INSTRUCTIONS OFWATER SYSTEM

1. Remove the front and top panels to gainaccess either to the control box and to theevaporator.

2. Make sure that all ice cubes have beenreleased from their cups, then switch OFF themachine at front master button switch.

3. Scoop out all the ice cubes stored into thebin in order to prevent them from beingcontaminated with the cleaning solution.

7. Using a bottle, poor fresh water into thebottom of the sump/freezing chamber to cleanout most of scale deposit.

8. Install again the spray platen, the curtain aswell as the bottom plastic cup.

9. Prepare the cleaning solution by diluting ina plastic container two liters of warm water (45°-50°C) with 0,2 liters of Ice Machine Cleaner.

WARNING. The SCOTSMAN Ice MachineCleaner contains Phosphoric andHydroxyacetic acids.These compounds are corrosive and maycause burns if swallowed, DO NOT indu-ce vomiting. Give large amounts of wateror milk. Call Physician immediately.In case of external contact flush withwater. KEEP OUT OF THE REACH OFCHILDREN.

10. Remove the evaporator cover then slowlypour onto the evaporator platen the cleaningsolution. With the help of a brush dissolve themost resistant and remote scale deposits in theplaten.

11. Switch ON again the machine at front masterbutton switch to start the icemaking process.Allow the ice maker to operate for about 20minutes. Then turn the cleaning switch to the"cleaning" position (II) till the release of the icecubes from their cups.

NOTE. The amount of Cleaner and the timeneeded for the cleaning of water systemdepends of the water conditions.

12. Switch OFF the ice maker at master buttonswitch then flush out the cleaning solution fromthe sump reservoir by taking off the sump plasticcup. Once flushed out install again the sumpplastic cup.

13. Pour onto the evaporator cavity two orthree liters of clean potable water to rinse themold cups and the platen.

14. Switch ON again the machine. The waterpump is again in operation to circulate the waterin order to rinse the entire water system.

4. Remove the plastic cup located on the bottomof sump/freezing chamber to drain out all waterand scale deposits.

5. Unloose the two thumb scews and removethe curtain.

6. Lift up the entire spray platen from its bottomseat and take it out to clean it separately.

Do the operation as per steps 12 and 13 twice soto be sure no more traces of descaling solutionremains into the sump.

15. With machine in OFF mode pour on theupper side of the evaporator platen fresh waterwith a capfull of sanitizing solution then turnagain the machine in normal operating mode soto sanitize all the water system for approx. 10minutes.

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

16. Switch OFF the machine and flush out thesanitizing solution from the sump reservoir thenwith the switch in "cleaning" position (II), switch itON again.When water starts overflowing through thedrain line, set the switch to "operation" (I)position. The unit is now ready to resumenormal operation.

17. Place again the evaporator cover and theunit service panels.

18. At completion of the freezing and harvestcycle make sure of proper texture and clearnessof the ice cubes and that, they do not have anyacid taste.

ATTENTION. In case the ice cubes arecloudy-white and have an acid taste, meltthem immediately by pouring on themsome warm water. This to prevent thatsomebody could use them.

19. Wipe clean and rinse the inner surfaces ofthe storage bin.

REMEMBER. To prevent the accumulationof undesirable bacteria it is necessary tosanitize every week the interior of the storagebin.

Servicemanual AC 46-56-86

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Transcript of Servicemanual AC 46-56-86