service manual ac-ec 47 ac-ec 57 ac-ec 87 ac-ec 107 ac … · 177** ac-ec 127 - cuber machine...

Scotsman Ice SrlVia Lainate, 31 - 20010 Pogliano M.se - Milano - ItalyTel. +39-02-93960.1 (Aut. Sel.)- Telefax +39-02-93550500Direct Line to Service & Parts:Phone +39-02-93960350 - Fax +39-02-93540449Website: www.scotsman-ice.itE-Mail: [email protected]

ISO 9001 - Cert. n. 0080

AC-EC 47AC-EC 57AC-EC 87

AC-EC 107AC-EC 127AC-EC 177

R 290 version

Electronic cubers with storagePC Board version

REV. 10/2018

SERVICE MANUAL

INDICE2369

121517

19191919202021

Table of contents pageSpecifications AC-EC 47Specifications AC-EC 57Specifications AC-EC 87Specifications AC-EC 107Specifications AC-EC 127Specifications AC-EC 177

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 diagram AC-EC 47-57-87-107-177Service diagnosis

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

394042

2223

28303134

45454546

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-EC 47

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

24.5

24

23.5

23

22.5

22

21.5

21

20.5

20

19.5

19

18.5

18

17.5

17

16.5

16

15.5

15

14.5

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

°Co

°Co

AC 47 AS 6 AirAC 47 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

NYA

AC 47 - CUBERmachine specifications

Cubes per harvest: 18 medium* At 32/21 °C amb.-water

96**NYA

Bin Water req. Capacity lt/24 HR

Stainless steel 1/4 9 Kg.



SPECIFICATIONS


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

NYA


96**NYA


EC 47 AS 6 AirEC 47 WS 6 Water

EC 47 - CUBERmachine specifications

643

MIN.10°C 5°C1 bar

-10%



SPECIFICATIONS


MAX.40°C35°C5 bar

+10%

ice making capacity


34

33

32

31

30

29

28

27

26

25

24

23

22

21

20

19

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

.

10

21

32

38

°Co

°Co

AC 57 AS 6 AirAC 57 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 96* **NYA



7.6

NYA


Stainless steel 1/4 12.5 Kg.



SPECIFICATIONS


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

0 96* **NYA



7.6

NYA



MIN.10°C 5°C1 bar

-10%



SPECIFICATIONS


MAX.40°C35°C5 bar

+10%

ice making capacity


44

43

42

41

40

39

38

37

36

35

34

33

32

31

30

29

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

°Co

°Co





SPECIFICATIONS


230/50/1 3.2 20 570 3 x 1.5 mm2 10

0143**NYA



10.8

NYA


MIN.10°C 5°C1 bar

-10%



SPECIFICATIONS

ELECTRONIC CUBER MODEL AC-EC 107

MAX.40°C35°C5 bar

+10%

ice making capacity


53

52

51

50

49

48

47

46

45

44

43

42

41

40

39

38

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

°Co

°Co





SPECIFICATIONS


230/50/1 3.2 20 580 3 x 1.5 mm2 10

0125**NYA

AC 107 - CUBER (R290 version)machine specifications


10.7

NYA





SPECIFICATIONS


230/50/1 3.2 20 580 3 x 1.5 mm2 10

0125**NYA

EC 107 - CUBER (R290 version)machine specifications


10.7

NYA



MIN.10°C 5°C1 bar

-10%



SPECIFICATIONS


MAX.40°C35°C5 bar

+10%

ice making capacity


76

74

72

70

68

66

64

62

60

58

56

54

52

50

48

46

Kg.

32 27 21 15 10

AIR COOLED MODELS

WATER TEMPERATURE

AM

BIE

NT

TEM

PE

RAT

UR

E

ICE

PRO

DUCE

D PE

R 24

HRS

.

1021

32

38

°Co

°Co

AC-EC 127 AS 6 AirAC-EC 127 WS 6 Water




SPECIFICATIONS


230/50/1 4.5 20.5 670 3 x 1.5 mm2 10

177**

AC-EC 127 - CUBERmachine specifications

Cubes per harvest: 56 medium* At 21°C water temperature

Dimensions:

HEIGHT (without legs) 920 mm.HEIGHT (with legs) 1009 mm.WIDTH 680 mm.DEPTH 600 mm.WEIGHT 70 Kgs.

12.9.0


920

MIN.10°C 5°C1 bar

-10%



SPECIFICATIONS


MAX.40°C35°C5 bar

+10%

ice making capacity


97969594939291908988878685848382818079787776757473727170696867

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

°Co

°Co

Stainless steel 3/4 48 Kg.AC-EC 177 AS 6 AirAC-EC 177 WS 6 Water



SPECIFICATIONS


230/50/1 4 22 1000 3 x 1.5 mm2 16

150**

AC-EC 177 - CUBERmachine specifications

Cubes per harvest: 56 medium* At 21°C water temperature

Dimensions:

HEIGHT (without legs) 990 mm.HEIGHT (with legs) 1079 mm.WIDTH 680 mm.DEPTH 600 mm.WEIGHT 70 Kgs.

17.4.0


Forward the completed self-addressedregistration card to Frimont factory.

11. If necessary, replace the four standard legswith the taller ones supplied in the machine andadjust 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.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.

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-EC 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 SCOTSMANDistributor or 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 representativepresent.

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

b) Cut open the top of the carton andremove the 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.

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.

GENERAL INFORMATION AND INSTALLATION

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

E. WATER SUPPLY AND DRAINCONNECTIONS

GENERALWhen 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 ofimpurities, it is advisable to consider the use anappropriate water filter or conditioner.

Water supply - Water cooled models

The water cooled versions of SCOTSMAN IceMakers require two separate inlet water supplies,one for the water sprayed for making the ice cubesand the other for the water cooled condenser.Connect the 3/4" GAS male fitting of the waterinlet, using the flexible tubing or a 3/8" O.D.copper pipe, to the cold water supply line withregular plumbing fitting and a shut-off valveinstalled in an accessible position between thewater supply line and the unit.

WATER DRAINThe 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 MODELSConnect 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.

WATER DRAIN - EC version

The water can be pumped out up to 1.5 m riseor

to 30 m on horizontal length.

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?

POWER

WATER INLET

WATER DRAIN

HAND DISCONNECT

SWITCH

WATER

FILTER

WATER

VALVE

POWER

WATER INLET

WATER DRAIN

HAND DISCONNECT

SWITCH

WATER

FILTER

WATER

VALVE

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

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

11. Has the Manufacturer’s registration cardbeen filled in properly? Check for correct model

and serial number against the serial plate andmail the registration card to the factory.

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

START UP

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

A. Turn the unit ON by the main switch. Unitwill start up in charging cycle mode.

NOTE. Every time the unit returns underpower, after having been switched off, thewater inlet valve, the hot gas valve and thewater drain valve get energized for a periodof 5 minutes, thus to admit new water to themachine sump reservoir to fill it up and,eventually, to wash-off any dirt that can havedeposited in it during the unit off period(Fig.1).

B. During the water filling operation, check tosee that the incoming water dribbles, through theevaporator platen dribbler holes, down into thesump reservoir to fill it up and also that the

OPERATING INSTRUCTIONS

incoming surplus of water flows out through theoverflow pipe into the drain line.

During the water filling phase the componentsenergized are:

THE WATER INLET SOLENOID VALVETHE HOT GAS SOLENOID VALVETHE WATER DRAIN SOLENOID VALVE (ONLYAC/EC 127-177).

NOTE. If in the 5 minutes lenght of the waterfilling phase the machine sump reservoirdoes not get filled with water up to the rim ofthe overflow pipe, it is advisable to check:

1.The water pressure of the water supply linethat must be at least 1 bar (14 psig) Minimum(Max 5 bar-70 psig).

2.The filtering device installed in the waterline that may reduce the water pressurebelow the Minimum value of 1 bar (14 psig).

3. Any clogging situation in the water circuitlike the inlet water strainer and/or the flowcontrol.

FIG. 1

16

15

13

2

1

7

8

9

10

3

4

5

6

11

12

Rx Tx

WATER IN VALVE

HOT GAS VALVE

COMPRESSOR

FAN MOTOR

WATER PUMP

- EVAPORATOR

- CONDENSER

TEM

PERA

TURE

SEN

SORS

BIN

TRANSF.

DATA

PROC

ESSO

R

ELECTR.TIMER

DIPSWITCH

ELECTRONIC CARD

L

N

RELAYS

RELAY

TRIAC

WATER DRAIN VALVE

In case of air condenser filter clogged such toprevent the proper flow of the cooling air or,in case the fan motor is out of operation orshortage of water in the water cooledcondenser, the condenser temperature risesand when it reaches 70°C (160°F) - for aircooled version - or 60°C (140°F) - for watercooled version - the condenser temperaturesensor shuts-off the ice maker with theconsequent light-up of the RED WARNINGLED (Fig.3) as well as the Red Alarm Light(ON Steady).

After having diagnosed the reason of the riseof temperature and removed its cause, it isnecessary to Switch OFF (wait few seconds)and Switch ON the unit, thus to put themachine in condition to initiate a new freezingcycle.

The machine restarts with the usual 5 minuteswater filling phase in order to provide enoughwater into the sump tank.

C. At completion of the water filling phase(5 minutes) the unit passes automatically into thefreezing cycle with the start up of:

COMPRESSOR

WATER PUMP

FAN MOTOR (in air cooled version) controlled bythe condensing temperature sensor located withinthe condenser fins (Fig.2).

OPERATIONAL CHECKS

D. Install, if required, the refrigerant servicegauges on both the high side and low sideScraeder valves to check the compressor headand suction pressures.

NOTE. On air cooled models, the condensertemperature sensor, which is located withinthe condenser fins, keep the head(condensing) pressure between values asper discharge pressure details at pag. 31.

FIG. 2

16

15

13

2

1

7

8

9

10

3

4

5

6

11

12

Rx Tx

WATER IN VALVE

HOT GAS VALVE

COMPRESSOR

FAN MOTOR

WATER PUMP

- EVAPORATOR

- CONDENSER

TEM

PERA

TURE

SEN

SORS

BIN

TRANSF.

DATA

PROC

ESSO

R

ELECTR.TIMER

DIPSWITCH

ELECTRONIC CARD

L

N

RELAYS

RELAY

TRIAC

WATER DRAIN VALVE

E. Check to see through the ice dischargeopening that the spray system is correctly seatedand that the water jets uniformely reach the

interior of the inverted mold cups; also make surethat the plastic curtain is hanging freely andthere is not excessive water spilling through it.

FIG. 3

FIG. 4

16

15

13

2

1

7

8

9

10

3

4

5

6

11

12

Rx Tx

WATER IN VALVE

HOT GAS VALVE

COMPRESSOR

FAN MOTOR

WATER PUMP

- EVAPORATOR

- CONDENSER

TEM

PERA

TURE

SEN

SORS

BIN

TRANSF.

DATA

PROC

ESSO

R

ELECTR.TIMER

DIPSWITCH

ELECTRONIC CARD

L

N

RELAYS

RELAY

TRIAC

WATER DRAIN VALVE

61

51

31

2

1

7

8

9

01

3

4

5

6

11

21

xTxR

EVLAVNIRETAW

EVLAVSAGTOH

ROSSERPMOC

ROTOMNAF

PMUPRETAW

ROTAROPAVE-

RESNEDNOC-

TEM

PERA

TURE

SEN

SORS

BIN

.FSNART

DATA

PROC

ESSO

R

.RTCELEREMIT

PIDHCTIWS

DRACCINORTCELE

L

N

SYALER

YALER

CAIRT

EVLAVNIARDRETAW

F. The ice making process takes place thereby,with the water sprayed into the molds that getsgradually refrigerated by the heat exchange withthe refrigerant flowing into the evaporatorserpentine. During the freezing process, theevaporator temperature falls to 0°C (Red Ledblinking as per Fig. 4) and then to -15°C (Red LedON steady as per Fig. 4a). When it reaches-15°C the evaporator temperature sensorsupplies a low voltage power signal to theelectronic control device (P.C.BOARD) in orderto activate an electronic timer. This one takesover the control of the freezing cycle up to thecomplete formation of the ice cubes.

NOTE. The lenght of the entire freezingcycle is governed by the evaporator tempe-rature sensor which has its probe placed incontact with the evaporator serpentine (Nonadjustable) in combination with the electronictimer (Adjustable) incorporated in theP.C.BOARD. The timer adjustment is factoryset in consideration of the ice maker type,cooling version and ice cube size (Small,Medium, Large). It is possible, however, tomodify the timed lenght of the freezing cycle,by changing the DIP SWITCH keys setting.In Table B of PRINCIPLE OF OPERATIONare shown the various time extensions of thefreezing cycle second phase, in relation withthe different DIP SWITCH keys setting.

G. After about 17÷20 minutes from the begin-ning of the freezing cycle, in an hypotheticambient temperature of 21°C, the defrost cycletakes place with the hot gas, the water inlet

and the water drain valves simoultaneouslyactivated (Fig. 5).The electrical components in operation on modelsare:COMPRESSORWATER INLET VALVEHOT GAS VALVEWATER DRAIN VALVE only AC/EC 127-177WATER PUMPon the first 15 seconds on models only AC/EC127-177.

NOTE. The lenght of the defrost cycle isautomatically determinated by the micro-processor of the P.C. BOARD in relation ofthe time necessary for the unit to reduce theevaporator temperature from 0°C (32°F) smallRed LED blinking to -15°C (5°F) small RedLED ON steady - TIME T2.It is possible to extend the length of the defrostcycle by changing the setting of DIP SWITCH7 and 8 as shown on table at page 37.

H. Check, during the defrost cycle, that theincoming water flows correctly into the sumpreservoir in order to refill it and that the surplusoverflows through the overflow drain tube.

I. Check the texture of ice cubes just released.They have to be in the right shape with a smalldepression of about 5-6 mm in their crown.If not, wait for the completion of the second cyclebefore performing any adjustment.

FIG. 4a

16

15

13

2

1

7

8

9

10

3

4

5

6

11

12

Rx Tx

WATER IN VALVE

HOT GAS VALVE

COMPRESSOR

FAN MOTOR

WATER PUMP

- EVAPORATOR

- CONDENSER

TEM

PERA

TURE

SEN

SORS

BIN

TRANSF.

DATA

PROC

ESSO

R

ELECTR.TIMER

DIPSWITCH

ELECTRONIC CARD

L

N

RELAYS

RELAY

TRIAC

WATER DRAIN VALVE

• Optical level sensor (IR) ; place some icecubes between IR optical sensing eyes. TheBin Full YELLOW LED starts blinking (Fig. 6),and when defrost cycle is over, the unit stopswith the simultaneous glowing of the same LEDto monitor the BIN FULL situation (Fig. 6a).

• Whenever necessary, pcb can be "calibrated"to assure the best comunication between thesame and ice level device just by turn the Mainswitch OFF an ON again.

Take the hand out from the ice level controlsensors to allow the resumption of the light beam.After approximately 6 seconds the ice makerresume its operation with the immediate glowingof the FIRST YELLOW LED indicating UNIT INOPERATION and the extinguishing of the “BINFULL” YELLOW LED.

NOTE. The ICE LEVEL CONTROL(INFRARED SYSTEM) is independent ofthe temperature however, the reliability of itsdetection can be affected by external lightradiations or by any sort of dirt and scalesediment which may deposit directly on thelight source and on the receiver.To preventany possible ice maker malfunction, due tonegative affection of the light detector, it isadvisable to locate the unit where it is notreached by any direct light beam or lightradiation, also it is recommended to keep thebin door constantly closed and to follow theinstructions for the periodical cleaning ofthe light sensor elements as detailed in theMAINTENANCE AND CLEANING PRO-CEDURES.This ice maker is equipped by an I/R self-calibration PC Board every time ice maker isturned OFF and ON by the main switch.

FIG. 5

16

15

13

2

1

7

8

9

10

3

4

5

6

11

12

Rx Tx

WATER IN VALVE

HOT GAS VALVE

COMPRESSOR

FAN MOTOR

WATER PUMP

- EVAPORATOR

- CONDENSER

TEM

PERA

TURE

SEN

SORS

BIN

TRANSF.

DATA

PROC

ESSO

R

ELECTR.TIMER

DIPSWITCH

ELECTRONIC CARD

L

N

RELAYS

RELAY

TRIAC

WATER DRAIN VALVE

If the ice cubes are shallow and cloudy, it ispossible that the ice maker runs short of waterduring the freezing cycle second phase or, thequality of the supplied water requires the use ofan appropriate water filter or conditioner. Only ECversion as soon as the water into the Sealed WaterReservoir reaches the maximum level, the two metalpins close the electrical contact through the water,transmitting a low voltage current to the PC Board.

The PC Board activates the Water Drain Pumpfor 8 seconds pumping out most of the watercontained into the Sealed Water Reservoir.

J. Upon the model, these icemakers rangeshall operate either by IR control device whichoperates by sensing eyes or Thermal sensor .Thermal sensor can detecting both the low tem-perature of the ice also the mass of the ice nearits sensing bulb.

For testing devices:• Storage bin thermal sensor ; place some ice

cubes in contact with the bulb, icemaker turnOFF at the end of harvest cycle. Remove ice from thebulb, ice maker restart from new freezing cycle.

FIG. 6

16

15

13

2

1

7

8

9

10

3

4

5

6

11

12

Rx Tx

WATER IN VALVE

HOT GAS VALVE

COMPRESSOR

FAN MOTOR

WATER PUMP

- EVAPORATOR

- CONDENSER

TEM

PERA

TURE

SEN

SORS

BIN

TRANSF.

DATA

PROC

ESSO

R

ELECTR.TIMER

DIPSWITCH

ELECTRONIC CARD

L

N

RELAYS

RELAY

TRIAC

WATER DRAIN VALVE

FIG. 6a

16

15

13

2

1

7

8

9

10

3

4

5

6

11

12

Rx Tx

WATER IN VALVE

HOT GAS VALVE

COMPRESSOR

FAN MOTOR

WATER PUMP

- EVAPORATOR

- CONDENSER

TEM

PERA

TURE

SEN

SORS

BIN

TRANSF.

DATA

PROC

ESSO

R

ELECTR.TIMER

DIPSWITCH

ELECTRONIC CARD

L

N

RELAYS

RELAY

TRIAC

WATER DRAIN VALVE

K. Remove, if fitted, the refrigerant servicegauges and re-fit the unit service panelspreviously removed.

L. Instruct the owner/user on the generaloperation of the ice machine and about thecleaning and care it requires.

PRINCIPLE OF OPERATIONHow it works

In the SCOTSMAN cube ice makers the waterused to make the ice is kept constantly incirculation by an electric water pump which primesit to the spray system nozzles from where it isdiverted into the inverted mold cups of theevaporator. A small quantity of the sprayedwater freezes into ice; the rest of it cascades bygravity into the sump assembly below forrecirculation.

FREEZING CYCLE (Fig. A and B)

The hot gas refrigerant discharged out from thecompressor reaches the condenser where, beingcooled down, condenses into liquid.Flowing into the liquid line it passes through thedrier filter, then it goes all the way through thecapillary tube where, due to the heat exchangingaction, it looses some of its heat content so thatits pressure and temperature are lowered aswell.Next the refrigerant enters into the evaporatorserpentine (which has a larger I.D. then thecapillary) and starts to boil off; this reaction isemphasized by the heat transferred by thesprayed water.The refrigerant then increases in volume andchanges entirely into vapor.The vapor refrigerant then passes through thesuction accumulator (used to prevent that anysmall amount of liquid refrigerant may reach thecompressor) and through the suction line. In boththe accumulator and the suction line it exchangesheat with the refrigerant flowing into the capillarytube (warmer), before to be sucked in thecompressor and to be recirculated as hotcompressed refrigerant gas.

The freezing cycle is controlled by the evaporatortemperature sensor (which has its probe incontact with the evaporator serpentine) thatdetermines the length of its first portion of thecycle.When the temperature of the evaporatorserpentine drops to a pre-set value (small RedLED ON steady) the evaporator sensor probechanges its electrical resistance allowing a lowvoltage current (15 volts) to flow to the P.C.BOARD which in turn activates an electronictimer.The timer, which is built-in the P.C. BOARD,takes over from the evaporator temperaturesensor, the control of the freezing cycle up to itscompletion.

NOTE. The change of the electric potential ofthe evaporator sensor with the consequentactivation of the timer (Time mode) is signalledby the glowing-up of the RED LED located inthe front of the P.C. BOARD.

ATTENTION. In case, after 15 minutesfrom the beginning of the freezing cycle,the temperature of the evaporator sensorprobe is higher then 0 ° C (32°F) - smallRed LED still OFF - (shortage of refrigerant,inoperative hot gas valve, etc.) the P.C.BOARD switch OFF immediately the unitwith the simultaneous blinking of theWARNING RED LED.

The length of this timed portion of the freezingcycle is pre-fixed and related to the setting of thefirst four DIP SWITCH keys. The DIP SWITCHkeys setting is made in consideration of the typeof condenser used and size of ice cubes.

AC-EC M 47 AAC-EC M 47 WAC-EC M 57 AAC-EC M 57 WAC-EC M 87 AAC-EC M 87 WAC-EC M 107 AAC-EC M 107 WAC-EC M 127 AAC-EC M 127 WAC-EC M 177 AAC-EC M 177 W

OFF

OFF

ON

OFF

ON

TAB. A

1 2 3 4 5 6 7 8 9 10

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

ON

ON

ON

ON

OFF

OFF

OFF

OFF

OFF

OFF

OFF

OFF

ON

OFF

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

OFF

OFF

OFF

OFF

OFF

ON

ON

ON

ON

ON

DIP SWITCH FACTORY SETTING COMBINATIONS (PER MODEL AND VERSION)

DIP SWITCH

FREEZING CYCLE DEFROST CYCLE 15/30" AIR/WATERDEFROST CYCLEADD. TIME

FIG. BFIG. A

FIG. DFIG. C

the ice maker model with the growing of the icethickness with the cubes fully formed in the cupmolds. The total length of the freezing cycleranges from 20 to 25 minutes.

DEFROST OR HARVEST CYCLE (Fig.C and D)

As the electronic timer has carried the systemthroughout the second phase of freezing cycle,the defrost cycle starts.

ATTENTION. In case the unit is able toreach 0 °C (32°F) evaporating temperaturewithin 15 minutes, but after 45 minutesfrom the beginning of the freezing cycle ithas not yet reached the evaporator tem-perature of -15 °C (5°F) the machine goesstraight into the defrost cycle omitting thetimed portion of the freezing cycle relied tothe setting of the first four DIP SWITCHES.

NOTE. The length of the defrost cycle isrelated to the length of the second phase offreezing cycle T2. (Time to drop theevaporating temperature from 0°C (32°F) -small Red LED blinking - to -15°C (5°F) smallRed LED ON steady.It is possible to extend the length of the defrostcycle by changing the setting of DIP SWITCH7 and 8 as shown on table at page 34.

The electrical components in operation duringthis phase are:COMPRESSORWATER INLET VALVEHOT GAS VALVEWATER DRAIN VALVE (ONLY AC/EC 127-177)and the

WATER PUMPon the first 15 seconds.

The incoming water, passing through the waterinlet valve and the flow control, runs over theevaporator platen and then flows by gravitythrough the dribbler holes down into the sump/reservoir. (Fig. D )The water filling the sump/reservoir forces part ofthe surplus water from the previous freezingcycle to go out to the waste through the overflowpipe. This overflow limits the level of the sumpwater which will be used to produce the nextbatch of ice cubes. Meanwhile, the refrigerant ashot gas, discharged from the compressor, flowsthrough the hot gas valve directly into theevaporator serpentine by-passing the condenser.The hot gas circulating into the serpentine of theevaporator warms up the copper molds causingthe defrost of the ice cubes. The ice cubes,released from the cups, drop by gravity onto aslanted cube chute, then through a curtainedopening they fall into the storage bin. At the endof the defrost cycle, the hot gas valve, the waterinlet valve and the water drain valve close and themachine starts again a new freezing cycle.

In Table B are indicated the various lengths of thetimed portion of freezing cycle in relation to thedifferent combinations of the DIP SWITCH KEYS.In Table A are illustrated the DIP SWITCH keyscombinations for the different models and versionsas they are set in the factory. The electrical componentsin operation during the freezing cycle are:COMPRESSORFAN MOTOR (in air cooled version)WATER PUMPand during the second phase of freezing cycle(Time mode) they are joined by the

ELECTRONIC TIMERThe refrigerant head pressure, at avarage 21 °Camb. temp., in the course of the freezing cycle,ranges between 15,5 - 10 bar according to themodel in the air cooled version, being controlledby the temperature sensor probe located withinthe condenser fins.On the air cooled version, the condenser tempe-rature sensor, when senses a rising of thecondenser temperature beyond the pre-fixedlimit, changes its electrical resistance andtransmits a low voltage power flow to the MicroProcessor of P.C. BOARD which in turn energizes,through a TRIAC, the FAN MOTOR.When the opposite situation occures, i.e. thecondenser temperature gets below the pre-fixedlimit, the temperature sensor changes again itselectrical resistance reducing therefore the currentflow to the P.C. BOARD to cause the fan motortemporary cut-off.

NOTE. In case the condenser temperatureprobe senses that the condenser temperatu-re has rised to 70°C (160°F) - on air cooledversions - or 60°C (140°F) - on water cooledversions - for one of the following reasons:CLOGGED CONDENSER (Air cooled version)INSUFFICIENT FLOW OF COOLINGWATER (Water cooled version)FAN MOTOR OUT OF OPERATION (Aircooled version)AMBIENT TEMPERATURE HIGHER THEN40°C (100°F)it causes the total and immediate SHUT-OFFof the machine in order to prevent the unitfrom operating in abnormal and dangerousconditions. When the ice maker stops onaccount of this protective device, there is asimultaneous glowing of the RED LED andRED LIGHT (STEADY), warning the user ofthe Hi Temperature situation. After havingeliminated the source of the condenser hi-temperature, to restart the machine it isnecessary to switch OFF (wait few seconds)and switch ON again the unit. The ice machineresumes its normal operation by going throughthe 5 minutes water filling phase.

At the start of the freezing cycle the refrigerantsuction or lo-pressure starts from 3,8 - 7,7 barand it declines gradually to 1,8 - 0,6 according to

HARVEST (Drain portion - first 15 sec.)

Electrical components (Loads) ON OFFCompressor ............................................ •Fan Motor (Air cooled only)and TRIAC ......... •Hot Gas Valve ........................................ •Water Inlet Valve .................................... •Water Drain valve (only AC/EC 127-177) •P.C.Board Relay 1 & 2 Coil .................... •P.C.Board Relay 3 Coil ............................... •Water Pump ........................................... •P.C.B. Timer ........................................... •Electronic Controls & Sensors ON OFFEvaporator Sensor ................................. •Condenser Sensor ................................. •Ice Level Control .................................... •

HARVEST (Water filling portion)

Electrical components (Loads) ON OFFCompressor ............................................ •Fan Motor (Air cooled only)and TRIAC ......... •Hot Gas Valve ........................................ •Water Inlet Valve .................................... •Water Drain valve (only AC/EC 127-177) •P.C.Board Relay 1 & 2 Coil .................... •P.C.Board Relay 3 Coil ............................... •Water Pump ........................................... •P.C. Board Timer ................................... •Electronic Controls & Sensors ON OFFEvaporator Sensor ................................. •Condenser Sensor ................................. •Ice Level Control .................................... •

OPERATING CHARACTERISTICS

OPERATING PRESSURE (bar) at 21°C amb. Temp.

AC 47 AC 57 AC 87 AC 107 AC 127 AC 177

SUCTION PRESSURE beg./end freezing

2,8/0,8 3,5/1,1 2,8/1,8 2,8/0,6 2,7/1,1 3,2/0,7

DISCHARGE PRESSURE

12/10,5 12,5/11 12/10,5 13/10 12/10,5 15,5/10,5

REFRIGERANT METERING DEVICE:capillary tube

REFRIGERANT CHARGE (R 290) grs:

Air cooled Water cooled

AC/EC 47 100AC/EC 57 100AC/EC 87 100AC/EC 107 120AC/EC 127 130AC/EC 177 170

AC 177 110 gr (3.88 oz.)

OPERATION - CONTROL SEQUENCE

At the start of freezing cycle the evaporator tem-perature sensor controls the length of the first partof the freezing cycle. As it reaches a predeter-mined temperature it supplies a low voltage currentto the P.C. BOARD in order to activate theelectronic timer which takes over the control ofthe freezing cycle for a pre-fixed time according tothe DIP SWITCH keys setting (see Tab. B).

NOTE. The evaporator temperature sensor,factory pre-set, is the same for all the modelsand is not adjustable in the field.

Once completed the timed portion of the freezingcycle the system goes automatically into thedefrost cycle which has also a pre-fixed length. Atcompletion of the defrost cycle the P.C. BOARDcommand the unit to start again a new freezingcycle.

OPERATION - ELECTRICAL SEQUENCEThe following charts illustrate which switches andwhich components are ON or OFF during aparticular phase of the icemaking cycle.Refer to the wiring diagram for a reference.

BEGINNING FREEZE

Electrical components (Loads) ON OFFCompressor ........................................... •Fan Motor (Air cooled only) and TRIAC ........ •Hot Gas Valve ........................................ •Water Inlet Valve .................................... •Water Drain Valve (only AC/EC 127-177) •P.C.Board Relay 1 Coil .......................... •P.C.Board Relay 2 & 3 Coil .................... •Water Pump ........................................... •P.C.B. Timer........................................... •Elctronic Controls & Sensors ON OFFEvaporator Sensor ................................. •Condenser Sensor ................................. •Ice Level Control .................................... •

TIMED FREEZE

Electrical components (Loads) ON OFFCompressor............................................ •Fan Motor (Air cooled only) and TRIAC ........ • •Hot Gas Valve ........................................ •Water Inlet Valve .................................... •Water Drain Valve (only AC/EC 127-177) •P.C.Board Relay 1 Coil .......................... •P.C.Board Relay 2 & 3 Coil .................... •Water Pump ........................................... •P.C.B. Timer........................................... •Electronic Controls & Sensors ON OFFEvaporator Sensor ................................. •Condenser Sensor ................................. • •Ice Level Control .................................... •

COMPONENTS

The components of the Pump Out Water DrainSystem are

• Sealed water tank• PC Board & Sensor• Sealed Water Pump• Check Valve

OPERATION

All water coming from the overflow, and from themelted ice is collected inside the Sealed WaterReservoir.

As soon as the water into the Sealed WaterReservoir reaches the maximum level, the twometal pins close the electrical contact throughthe water, transmitting a low voltage current tothe PC Board.

The PC Board activates the Water DrainPump for 8 seconds pumping out most ofthe water contained into the Sealed WaterReservoir.

PWD SYSTEM (EC version only) The water can be pumped out up to 1.5 m riseor

to 30 m on horizontal length.

POWER

WATER INLET

WATER DRAIN

HAND DISCONNECT

SWITCH

WATER

FILTER

WATER

VALVE

POWER

WATER INLET

WATER DRAIN

HAND DISCONNECT

SWITCH

WATER

FILTER

WATER

VALVE

A Check Valve, located on the water drain hose,prevents the coming back of the dischargedwater.

SCHEMATIC SYSTEM

Storage bin

Overflow draintube

Storage bindrain tube

Water tankinlet fitting

Sealedwatertank

Waterpump

Checkvalve

Vented tubeWater

levelsensors

Drain out

Drain fitting

COMPONENTS DESCRIPTION

A. EVAPORATOR TEMPERATURESENSOR

The evaporator temperature sensor probe,located in contact with the evaporator serpentine,detects the dropping of the evaporator tempera-ture during the freezing cycle and signals it bysupplying a current flow to the micro processor ofP.C. BOARD.According to the current received is energizedthe small Red LED of the PC Board (blink orsteady).When steady, the micro processor supplies powerto the electronic timer built into the P.C. BOARDso that it takes control of the last portion offreezing cycle.The length of the timed phase is pre-fixed by thesetting of the keys 1, 2, 3 and 4 of the DIPSWITCH.

NOTE. Whenever, after 15 minutes from thebeginning of the freezing cycle, theevaporating temperature have not yet reachedthe value of 0°C (32°F) - small Red LED OFF- the P.C.Board switches OFF the machinewith the BLINKING of WARNING RED LED.

B. CONDENSER TEMPERATURESENSOR

The condenser temperature sensor probe,located within the condenser fins (air cooledversion) or in contact with the tube coil(water cooled version) detects the condensertemperature variations and signals them bysupplying current, at low voltage, to the P.C.BOARD.In the air cooled versions, in relation to thedifferent current received, the micro processorof the P.C. BOARD supplies, through a TRIAC,the power at high voltage to the fan motor so tocool the condenser and to reduce its tempera-ture.In case the condenser temperature rises andreaches 70°C (160°F) - on air cooled models - or60°C (140°F) - on water cooled models - the

current arriving to the micro processor is such tocause an immediate and total stop of the machineoperation.

C. ICE LEVEL THERMAL PROBE

It operayes in detecting both the low tempera-ture of the ice and the mass near the binsensing bulb.

D. ICE BIN LEVEL LIGHT CONTROL

The electronic ice bin level control, located intothe storage bin, has the function to stop theoperation of the ice machine only at the end ofthe harvest cycle when the light beam betweenthe light source and the sensor is interrupted bythe ice cubes stored into the bin.When the light beam is interrupted the Bin FullYELLOW LED starts to blink; the ice machinestops with the glowing-up of the Bin Full YELLOWLED to monitor the situation of ice bin full at theend of the harvest cycle.Six seconds after the scoop out of the ice (withthe resumption of the light beam between the twoinfrared sensor of ice level control) the ice machinerestarts again with the extinguishing of theYELLOW LED.

E. P.C. BOARD(Data processor)

The P.C. BOARD , fitted in its plastic box locatedin the front of the unit, consists of two separatedprinted circuits one at high and the other at lowvoltage integrated with fuse on power out(6.3 A), of four aligned LEDS monitoring theoperation of the machine, of one extramonitoring RED LED (blink 0°C - steady -15°C), of one DIP SWITCH with ten keys, ofone push button, of input terminals for theleads of the sensor probes and input andoutput terminals for the leads of the ice makerelectrical wires.

The P.C. BOARD is the brain of the system andit elaborates, through its micro processor, thesignals received from the three sensors in order

6-12MONTHS

EC SERIES 0 OR 60 MINUTESDELAY

TEST

ON STEADY

BLINKING0-12

MONTHS

to control the operation of the different electricalcomponents of the ice maker (compressor, waterpump, solenoid valves, etc.).

At restart, from any tripping OFF at Bin Full, thenew PC Board assures 45 seconds water fillingphase so to refill the water sump up to themaximum level.In case of malfunction of the Optical Ice LevelControl, thenew PC Board switch ON alternativeltthe Yellow and Red Led continuously.

On the PC Board there are four jumpers toselect:• 0 or 12 months remind time for the water

system cleaning• Operation of the Purge Out Water Pump

(Jump IN on EC series)• "no delay" or 60 minutes delay time at first start

up• TEST

In case the TEST contacts are closed with theJumper, at the Start Up of the machine the PCBoard energizes all the electrical components formaximum 3 minutes time.

At the end of the 3 minutes the PC Board switchOFF the entire machine with the blinking of all theLED's as shown on the bottom drawing.

F. PUSH BUTTON OPERATION

DURING WATER FILLING PHASE• Push for more then 2” but less then 5” themachine enters in Cleaning Mode• Push for more then 5” the machine by-passthe Water Filling Phase

DURING FREEZING/HARVEST CYCLE• Push for more then 5” during the Freezingcycle the machine goes immediately intoHarvest• Push for more then 5” during the Harvest cyclethe machine enters immediately in the Freezingcycle

The length of Harvest is equal to:

•35” if Push Button is activated before -15°C evaporating temperature LEDactivation

•As per Harvest cycle chart, if Push Buttonis activated after -15°C evaporatingtemperature LED activation (Red LED insidePC Board ON steady)

• Push more then 20” to restore remind cleaningtimer.

G. LED MEANING

GREEN LED ONUnit under power

YELLOW BIN FULL LED ONUnit shut-OFF at storage bin fullYELLOW BIN FULL LED BLINKINGInfrared beam break out

RED ALARM LED ONToo hi condensing temperatureRED ALARM LED BLINKINGToo hi evaporating temperature

YELLOW FREEZING CYCLE ONUnit in freezing cycle mode

YELLOW FREEZING LED AND RED ALARMLED ONCondenser sensor out of orderYELLOW FREEZING LED AND RED ALARMLED BLINKINGEvaporator sensor out of order

FREEZING CYCLE

BIN FULL

POWER

TOO HI EVAP TEMP

TOO HI COND TEMP

PUSHBUTTON

PUSHBUTTON

LED STATUS REASON WHY

ON STEADY UNIT UNDER POWER

ON STEADY FREEZING CYCLE

BLINKING60 MINUTES DELAY AT START UPJUMPER J3 OUT

ON STEADYTOO HI DISCHARGEPRESSURE/TEMP

BLINKINGTOO HI EVAP. TEMP. (> 0C°)AFTER 15’ FROM START UP

ON STEADY UNIT OFF AT BIN FULL

BLINKINGSLOW I/R BEAM CUTTED

I/R ON AFTER TRIP OFF ATBIN FULL

BLINKINGFAST

ON STEADY I/R CALIBRATION DONE

BLINKINGUNIT IN CLEANING MODE OR TRIPPINGOFF AFTER TEST - JUMPER TEST IN

ON STEADYCONDENSER SENSOR OUTOF ORDER

BLINKINGEVAPORATOR SENSOR OUTOF ORDER

BLINKINGALTERNATIVELY I/R SENSOR OUT OF ORDER

PUSH

PUSH > 5” DURING WATER FILLING TOMOVE THE UNIT INTO FREEZING

PUSH > 5” DURING FREEZINGTO MOVE THE UNIT INTO DEFROST

PUSH > 5” DURING DEFROSTTO MOVE THE UNIT INTO FREEZING

PUSH 2” > 5” DURING WATER FILLINGTO MOVE THE UNIT INTO CLEANINGPUSH DURING THE 60 MIN START UP

DELAY TIME TO BY-PASS IT

H. DIP SWITCH

The P.C.BOARD which controls the entireoperation of the ice maker, has a DIP SWITCHwith ten switching keys which allow to set upthe micro processor program in order to extend orto shorten the length of freezing cycle in relation tothe different model and versions of ice machines.

The DIP SWITCH first four keys settingdetermines the length of the 2nd phase offreezing cycle (controlled by the electronictimer) as detailed in the table B.

The DIP SWITCH keys 5 & 6 setting determinesthe length of the defrost cycle according to the

LENGTH OF TIMED PORTION OF FREEZING CYCLE ACCORDING TO THEDIP SWITCH SETTING COMBINATIONS

TAB. B

size of the cubes (Large or Medium) as per thefollowing setting:ON ON : PROGRAM AON OFF : PROGRAM BOFF OFF : PROGRAM COFF ON : PROGRAM D

LENGTH OF HARVEST CYCLEACCORDING TO THE TIME TO DROP THE

EVAP. TEMPERATURE FROM 0°C TO -15°C

LENGTH PROGRAMSHARVEST

CYCLE A B C D180” Up to 6’30” *** Up to 9’30” xxxx165” 6’30”-7’ Up to 3’ 9’30”-10’ xxxx150” 7’-8’ 3’-3’15’ 10’-11’ xxxx135” 8’-9’ 3’15”-3’30” 11’-12’ xxxx120” 9’-10’30” 3’30”-4’30” 12’-13’30” < 3'105” 10’30”-12’ 4’30”-6’ 13’30”-15’ 3' - 4'90” >12’ >6’ >15’ > 4'

The DIP SWITCH N° 7 and 8 allow the extentionof the length of the harvest/defrost cycle accordingto their combination as per following chart:

DIP SWITCH ADDITIONAL DEFROST TIME

7 8

ON ON 0

OFF ON 30"

ON OFF 60"

With both DIP SWITCH 7 & 8 in OFF position, WaterPump is OFF during the Harvest Cycle with no additionaltime.

The 9th key is used to supply power to the waterpump for the first 15 seconds of the defrost cycle- position OFF - or for the first 30 seconds -position ON .

The 10th key is used to modify the CUT-OUTcondensing temperature from 70 °C (160°F) forthe air cooled versions - ON position - to 60°C(140°F) - OFF position - for the water cooledversions.

I. 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. Alower plastic guide, installed inside the unit, isused for the correct sliding and location of the airfilter.

L. WATER SPRAY SYSTEM

Through its nozzles, the water pumped, is sprayedin each individual cup to be frozen into ice.It consists of one spray tube wheve are locatedseveral spray nozzles.

M. WATER PUMP

The water pump operates continually throughoutthe freezing cycle and on the first 15 or 30seconds of the defrost cycle so to such theremaining water from the sump tank (reach inmineral salts) and drain it out. During the freezingcycle the pump primes the water from the sumpto the spray system and through the spray nozzlessprays it into the inverted cup molds to be frozeninto crystal clear ice cubes. It is recommendedthat the pump motor bearings be checked atleast every six months.

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

The water inlet solenoid valve is activated by themicro processor of the P.C. BOARD during thefirst 5 minutes of water filling phase as well asduring the defrost cycle. When energized it allowsa metered amount of incoming water to flow overthe evaporator cavity to assist the hot gas indefrosting the ice cubes. The water running overthe evaporator cavity drops by gravity, throughthe dribbler holes of the platen, into the sumpreservoir where it will be sucked by the waterpump and primed to the spray system.

O. WATER INLET SOLENOID VALVE -3/4 MALE FITTING(AC/EC 47-57-87-107 only)

A second water inlet solenoid valve is used onwater cooled version. An automatic hi pressurecontrol activates the coil of the water inlet solenoidvalve so to supply a metered amount of water tothe condenser and drop down its temperatureand pressure.

P. 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 energizedthrough the micro processor of P.C. BOARDduring the defrost cycle as well as during thewater filling phase. During the defrost cycle thehot gas valve coil is activated so to attract the hotgas valve piston in order to give way to the hotgas discharged from compressor to flow directlyinto the evaporator serpentine to defrost theformed ice cubes.

Q. FAN MOTOR (Air cooled version)

The fan motor is controlled through the P.C.BOARD and the TRIAC by the condenser tempe-rature sensor. Normally it operates only duringthe freezing cycle to draw cooling air through thecondenser fins. In the second part of the freezingcycle, the fan motor can run at intermittance asthe condenser pressure must be kept betweentwo corresponding head pressure values.

R. 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 rise

and become high pressure hot vapor which isthen released through the discharge valve.

S. HI PRESSURE CONTROL(AC/EC 47-57-87-107 only)

Used only on the water cooled versions it operatesto keep between 9.5 and 10.5 bars (135 ÷ 150psig) the hi-side or discharge pressure of therefrigerant system by energizing the coil of thewater inlet solenoid valve that control the coolingwater flow to the condenser.

T. WATER REGULATING VALVE(AC/EC 127-177 only)

This valve controls the head pressure in therefrigerant system by regulating the flow of watergoing to the condenser.As pressure increases, the water regulating val-ve opens to increase the flow of cooling water.

U. WATER DRAIN SOLENOID VALVE(AC/EC 127-177 only)

The water drain solenoid valve, electricallyconnected in parallel to the water inlet and to thehot gas solenoid valves, is energized for all thelength of the defrost cycle. By means of the waterpump, that remains energized for 15 seconds atthe beginning of the defrost cycle, it allows thedrain out of all remaining water (rich of mineralsdeposited during the previous freezing cycle)from the sump tank. By doing so it allows to theice maker to make every new freezing cycle withnew fresh water, avoiding thereby theaccumulation of sediments and scales, whichsoon or later will cause the partial or total cloggingof the water system on the unit.

SMALLIDENTATION

LITTLE OR NOICE IN CENTEROF CUBES

THICK BULGESOLID ICE

ADJUSTMENT PROCEDURES

A. ADJUSTMENT OF THE CUBE SIZE

CAUTION. Before performing actualadjustment of the cube size , check otherpossible causes for cube size problems,refer to the Service Diagnosis Section forproblem review and analysis.Do not perform any adjustment till theicemaking system has progressedthrough several complete freezing andharvest cycle, to observe size and qualityof ice cubes and whether or not the cubesize problem exists.

I. If the cubes are shallow size (Indentation istoo deep) probably the length of the secondphase of the freezing cycle is too short so, toextend such length you have to:

1. Locate the DIP SWITCH on the front of theP.C.Board.

2. Take note of the combination of the first fourDIP SWITCH KEYS and check the corrispondinglength of freezing cycle 2nd phase on Table B.

3. Set the same DIP SWITCH KEYS tocorrespond to the prior combination shown onTable B which allow an extention of two moreminutes of the length of the freezing cycle.

4. Observe the ice cubes in the next twoharvests and eventually repeat steps 2 and 3above until proper ice cubes size is achieved.See figure.

II. If the cubes are oversize size (Indentation istoo full) probably the length of the second phaseof the freezing cycle is too long.To shorten such length you have to:

1. Locate the DIP SWITCH on the front of theP.C.Board.

2. Take note of the combination of the first fourDIP SWITCH KEYS and check the corrispondinglength of freezing cycle 2nd phase on Table B.

3. Set the same DIP SWITCH KEYS tocorrespond to the next combination shown onTable B which allow a reduction of two minutes ofthe length of the freezing cycle.

4. Observe the ice cubes in the next twoharvests and eventually repeat steps 2 and 3above until proper ice cubes size is achieved.See figure.

WIRING DIAGRAMAC-EC 47-57-87-107-177 AIR AND WATER COOLED 230/50-60/1

The unit is shown on freezing cycle

SERVICE DIAGNOSIS

SYMPTOM POSSIBLE CAUSE SUGGESTED CORRECTION

Unit will not run Blown power in fuse in P.C.Board Replace fuse & check for cause of(No warning LEDS glows) blown fuse

Main switch in OFF position Turn switch to ON position

Inoperative P.C.Board Replace P.C.Board

Loose electrical connections Check wiring

(Green LED-Power ON glows) Blown power out fuse in P.C. Board Replace fuse & check for cause ofblown fuse

(Bin full LED glows) Inoperative ice level control Clean or replace ice level control


(Red-alarm LED-LIGHT glows) High head pressure Inoperative fan motor. ReplaceShortage of water (WC)

(Red-alarm LED blinks) High evaporating temperature Hot gas valve leak - Replace it.after 15 mins. beginning freeze Water inlet valve leak - Replace it.

Short of refrigerant.Compressor cycles intermittently

(Freezing LED + Red-alarm LED glows) Condenser sensor out of order Replace itand Red-alarm Light blinks twiceand repeat

(Freezing LED + Red-alarm LED blinks) Evaporator sensor out of order Replace it

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

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

Mechanical problem Replace compressor

Cubes too small Freezing cycle too short Review setting of DIP SWITCH keys

Capillary tube partially restricted Blow charge, add new gas & drier,after evacuating systemwithvacuumpump

Moisture in the system Same as above

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

SYMPTON POSSIBLE CAUSE SUGGESTED CORRECTION

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 Replace water inlet valve

Leak of water drain valve Replace valve

Irregular cubes size & some Some jets plugged Remove jet cover and cleancloudy

Shortage of water See shortage of water

Unit not level Level as required

Cubes too large Freezing cycle too long Review setting of DIP SWITCH keys

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 (Red-alarm LED glows) 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

Hot gas solenoid valve leaking Replace valve

Short of refrigerant Charge to data plate indication

Discharge head pressure too high See incorrect discharge pressure

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

Water inlet valve not opening Valve coil with open windingReplace valve

Hot gas valve orifice restricted Replace hot gas valve assy

Clogged air vented holes in mold cups Clean out holes plugged

Discharge head pressure too low See incorrect discharge pressure

SERVICE DIAGNOSIS

SYMPTON POSSIBLE CAUSE SUGGESTED CORRECTION

Unit won’t harvest Inoperative P.C.Board Replace P.C.Board

Hot gas valve not opening Valve coil with open windingReplace valve

Water solenoid valve not opening Valve coil with open windingReplace valve

Incorrect discharge pressure Inoperative condenser sensor Replace sensor


Water regulating valve misadjusted Adjust its setting stem

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. CLEAN - REPLACE OF AIRCONDENSER FILTER

NOTE. The new AC series, in the air cooledversion, are standard equipped with an aircondenser filter as well as a CleaningReminder Board to remind to the end userthe need for the cleaning of the air filter or ofthe water system (Red Alarm Light ON Steadyor Blinking rispectively with machine inoperation).

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, usetap water always in the counter flow airdiretcion.Once cleaned shake it so to remove most ofthe accumulated water, then dry it using anhair dryer.

NOTE. In case the air filter strainer isdamaged replace it with a new one.

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

A. ICEMAKER

The fol lowing maintenance should bescheduled at least two times per year on theseicemakers.

1. Check and clean the water line strainer.

2. Check that the icemaker is levelled in side

to side and in front to rear directions.

3. Check for water leaks and tighten drain lineconnections.Pour water down bin drain line to be sure thatdrain line is open and clear.

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

5. Check the ice level control sensor to testshut-off. Put your hand between the light sourceand the receiver so to cut off the light beam for atleast one minutes.This should cause the ice maker to shut off andthe light up of the 2nd LED (yellow light) a the endof defrost cycle.

NOTE. Within few seconds after the removalof the hand from the Infrared sensing light theicemaker restarts in freezing cycle. The icelevel control uses devices that sense light,therefore they must be kept clean enough sothey can "see". Every month clean/wipe thesensing "eyes" with a clean soft cloth.

6. Check for refrigerant leaks.

B. CLEANING/SANITISING INSTRUCTIONSOF WATER SYSTEM

Clean-sanitise the water system, evaporator, binand spray jets using a solution of SCOTSMANIce Machine Cleaner/Sanitizer.

NOTE. Cleaning requirements vary accordingto the local water conditions and individualuser operation.Continuous check of the clarity of ice cubesand visual inspection of the water sprayingparts before and after cleaning will indicatefrequency and procedure to be followed inlocal areas.

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.

4. Remove the plastic cup located on thebottom of sump/freezing chamber to drain out allwater and scale deposits.

5. Lift up and remove the curtain.

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

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.

Cleaning9. 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 frontmaster button switch then push the PC BOARD

FIG. 8

16

15

13

2

1

7

8

9

10

3

4

5

6

11

Rx Tx

WATER IN VALVE

HOT GAS VALVE

FAN MOTOR

WATER PUMP

- EVAPORATOR

- CONDENSER

TEM

PERA

TURE

SEN

SORS

BIN

TRANSF.

DATA

PROC

ESSO

R

ELECTR.TIMER

DIPSWITCH

ELECTRONIC CARD

L

N

RELAYS

RELAY

TRIAC

WATER DRAIN VALVE

COMPRESSOR

12

PUSH BUTTON for more then 2" and less of 5"to put the machine in cleaning mode.

NOTE. With the system in CLEANING/RINSING mode the water pump is the onlycomponent in operation to circulate thecleaning solution in the entire water systemwhile the three leds of the PC Board areblinking (Fig. 8).

12. Let the unit to remain in the CLEANINGmode for about 20 minutes then unplug again themachine.

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

13. 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.

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

15. Switch ON again the machine. The waterpump is again in operation to circulate the waterin order to rinse the entire water system.Do the operation as per steps 13 and 14 twice soto be sure no more traces of descaling solutionremains into the sump.

REMEMBER. To prevent the accumulationof undesirable bacteria it is necessary tosanitize the interior of the storage bin withan anti-algae disinfectant solution everyweek.

Sanitation

NOTE. Sanitation of the water system isrecommended to be done once a month.

1. Prepare in a plastic container the sanitationsolution as per manufacturer dilution using warmwater (45-50 °C).

NOTE. Never mix the cleaning with thesanitising solution.

16

15

14

13

2

1

7

8

9

10

3

4

5

6

11

Rx Tx

WATER IN VALVE

HOT GAS VALVE

FAN MOTOR

WATER PUMP

- EVAPORATOR

- AMBIENT

- CONDENSER

TEM

PERA

TURE

SEN

SORS

BIN

COM

PRES

SOR TRANSF.

DATA

PROC

ESSO

R

ELECTR.TIMER

DIPSWITCH

ELECTRONIC CARD

L

N

RELAYS

RELAY

TRIAC

WATER DRAIN VALVE

CONTACTOR COIL

12

FIG. 8

2. Follow the procedures as per cleaning waterpump operation, only by keeping pushed Resetbutton between 2 ÷ 5" during water filling. Justshorting the operation of the water pump to 10minutes.

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

4. 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.

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

REMEMBER. To prevent the accumulation ofundesirable bacteria it is necessary to sanitizeevery week the interior of the storage bin.

service manual ac-ec 47 ac-ec 57 ac-ec 87 ac-ec 107 ac … · 177** ac-ec 127 - cuber machine...

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