MC16-46 - IceParts

Page 1

Page 1

SERVICE MANUAL

MC 16

MC 46

Electronic modular cubers

MS 1002.02 REV. 01/2007

Page 2

TABLE OF

CONTENTS

Table of contents

Specifications MC 16

Specifications MC 46

GENERAL INFORMATION AND INSTALLATION

Introduction

Unpacking and Inspection - Ice maker

Unpacking and Inspection - Storage bin

Location and levelling

Stacking installation

Electrical connections

Water supply and drain connections

Final check list

Installation practice

OPERATING INSTRUCTIONS

Start up

Operatiobnal checks

OPERATING PRINCIPLES (How it works)

Freezing cycle

Harvest cycle

Control sequence

Component description

ADJUSTMENT, REMOVAL AND REPLACEMENT PROCEDURES

Adjustment of the cube size

Wiring diagram

Service diagnosis

MAINTENANCE AND CLEANING INSTRUCTIONS

General

Icemaker

Cleaning instructions of water system

Page 2

11

12

16

18

19

20

9

10

8

9

10

7

7

7

7

2

3

5

24

25

29

31

31

32

Page 3

Page 3

SPECIFICATIONS

ELECTRONIC MODULAR CUBER MODEL MC 16

Important operating requirements:

Air temperature

Water temperature

Water pressure

Electr. voltage variations from voltage rating specified on nameplate

MIN.

10

°

C (50

°

F)

5

°

C (40

°

C)

1 bar (14 psi)

-10%

MAX.

40

°

C (100

°

F)

35

°

C (90

°

F)

5 bars (70 psi)

+10%

ice making capacity

140

130

120

110

100

90

80

32

MODÈLES REFROIDIS PAR AIR

AIR COOLED MODELS

K g .

180

°

C

170 10

21

160

150

27 21 15

32

38

10

°

C

140

130

120

110

100

90

80

32

MODÈLES REFROIDIS PAR EAU

WATER COOLED MODELS

K g .

180

°

C

170

160

10

21

32

38

150

27 21 15 10

°

C

NOTE. The daily ice-making capacity is directly related to the condenser air inlet temperature, water temperature and age of the machine.

To keep your SCOTSMAN MODULAR CUBER at peak performance levels, periodic maintenance checks must be carried out as indicated on maintenance section of this manual.

Production charts shown are indicating the production of MCM and MCL models. For MCS models ice production is approx. 10% lower.

Page 4

SPECIFICATIONS

Page 4

ACCESSORIES

KSC 11: Cube stacking kit

DIMENSIONS:

HEIGHT

WIDTH

DEPTH

WEIGHT

513 mm.

1074 mm.

534 mm.

117 Kgs.

Model

MC 16 AS 6B

MC 16 WS 6B

MC 16 - MACHINE SPECIFICATIONS

Comp. HP Cond. unit

Air

Water

Finish

Stainless steel

Stainless steel

1.5

Water req. - lt/24 HR

300

1700*

Basic electr.

Amps

Starts amps.

32

Watts

Electric power cons.

Kwh x 24 HR

230/50/1 N

400/50/3 N

5.5

7 1250 25.7

Cubes per harvest: MCL-16 72 large - MCM-16 102 medium - MCS 16 198 small

* At 15

°

C (60

°

F) water temperature

N. of wires Amps. fuse

3 x 1.5 m/m 2

5 x 1.5 m/m 2

20

10

3 x

Page 5

SPECIFICATIONS

ELECTRONIC CUBER MODEL MC 46

Page 5

Important operating requirements:

Air temperature

Water temperature

Water pressure

Electr. voltage variations from voltage rating specified on nameplate

MIN.

10

°

C (50

°

F)

5

°

C (40

°

C)

1 bar (14 psi)

-10%

MAX.

40

°

C (100

°

F)

35

°

C (90

°

F)

5 bars (70 psi)

+10%

ice making capacity

MODÈLES REFROIDIS PAR AIR

AIR COOLED MODELS

K g .

310 °

C

10

300

21

290

240

230

220

280

270

260

250

32

210

200

190

180

32 27 21 15

38

10

°

C

240

230

220

280

270

260

250

MODÈLES REFROIDIS PAR EAU

K g .

WATER COOLED MODELS

310 °

C

300

10

290

21

32

38

210

200

190

180

32 27 21 15 10

°

C

NOTE. The daily ice-making capacity is directly related to the condenser air inlet temperature, water temperature and age of the machine.

To keep your SCOTSMAN MODULAR CUBER at peak performance levels, periodic maintenance checks must be carried out as indicated on maintenance section of this manual.

Production charts shown are indicating the production of MCM and MCL models. For MCS models ice production is approx. 10% lower.

Page 6

SPECIFICATIONS

Page 6

ACCESSORIES

KSC 11: Cube stacking kit

DIMENSIONS:

HEIGHT

WIDTH

DEPTH

WEIGHT

874 mm.

1074 mm.

534 mm.

185 Kgs.

Model

MC 46 AS 6B

MC 46 WS 6B

MC 46 - MACHINE SPECIFICATIONS

Comp. HP Cond. unit

Air

Water

Finish

Stainless steel

Stainless steel

2.5

Water req. - lt/24 HR

660

2800*

Basic electr.

230/50/1 N

400/50/3 N

Amps

10

5.5

Starts amps.

66

14

Watts

2400

Electric power cons.

Kwh x 24 HR

50

Cubes per harvest: MCL-46 144 large - MCM-46 204 medium - MCS 46 396 small

* At 15

°

C (60

°

F) water temperature

N. of wires Amps. fuse

3 x 1.5 m/m 2

5 x 1.5 m/m 2

20

10

3 x

Page 7

Page 7

GENERAL INFORMATION AND INSTALLATION

A.

INTRODUCTION

This manual provides the specifications and the step-by-step procedures for the installation, startup and operation, maintenance and cleaning for the SCOTSMAN MODULAR CUBERS.

The Electronic Modular Cubers are quality designed, engineered and manufactured.

Their ice making systems are thoroughly tested providing the utmost in flexibility to fit the needs of a particular user.

These icemakers have been engineered to our own rigid safety and performence standards.

NOTE. To retain the safety and performance built into this icemaker, it is important that installation and maintenance be conducted in the manner outlined in this manual.

Storage Bin

Since the MC series Modular Cubers do not have their own attached ice storage bins, it is necessary to use an auxiliary bin such as the Bin

B 350 or B 550.

7.

Check that refrigerant lines do not rub against or touch other lines or surfaces, and that the fan blade moveS freely.

8.

Check that the compressor fits snugly onto all its mounting pads.

9.

See data plate on the rear side of the unit and check that local main voltage corresponds with the voltage specified on it.

CAUTION. Incorrect voltage supplied to

the icemaker will void your parts replacement program.

10. Remove the manufacturer’s registration card from the inside of the User Manual and fillin all parts including: Model and Serial Number taken from the data plate.

Forward the completed self-addressed registration card to Frimont/Scotsman Europe factory.

B.

UNPACKING AND INSPECTION

Modular Cuber

1.

Call your authorized SCOTSMAN Distributor or Dealer for proper installation.

2.

Visually inspect the exterior of the packing and skid. Any severe damage noted should be reported to the delivering carrier and a concealed damage claim form filled in subjet to inspection of the contents with the carrier’s representative present.

3.

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

b) Remove the packing nails securing the carton box to the skid.

c) Cut open the top of the carton and remove the polystyre protection sheet.

d) Pull out the polystyre posts from the corners and then remove the carton.

4.

Remove top and sides panels of the unit and inspect for any concealed damage. Notify carrier of your claim for the concealed damage as stated in step 2 above.

5.

Loose two nuts on left and rights side of the unit base and remove it from the skid. Save the two bolts and nuts to mount the machine on storage bin or on top of another Modular Cuber.

6.

Remove all internal support packing and masking tape and the hardware package.

Storage bin

1.

Follow the steps 1, 2 and 3 above to unpack the storage bin.

2.

Unloose the two bolts and remove the protection plate from the drain fitting.

3.

Carefully lay it down on its rear side and fit the four legs into their sockets.

4.

Remove all internal support packing and masking tape as well as the plastic ice cube deflector.

5.

Remove the manufacturer’s registration card from the inside of the User Manual and fillin all parts including: Model and Serial Number taken from the data plate.

Forward the completed self-addressed registration card to Frimont/Scotsman Europe factory.

C.

LOCATION AND LEVELLING

WARNING. This Ice Cuber is designed for indoor installation only. Extended periods of operation at temperature exceeding the following limitations will constitute misuse under the terms of the SCOTSMAN

Manufacturer’s Limited Warranty resulting in LOSS of warranty coverage.

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Page 8

1.

Position the Bin in the selected permanent location. 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 cooled models.

d) Service access: adequate space must be left for all service connections through the rear of the ice maker. A minimum clearance of 15 cm

(6") must be left at the sides of the unit for routing cooling air drawn into and exhausted out of the compartment to maintain proper condensing operation of air cooled models.

2.

Level the Storage Bin Assy in both the left to right and front to rear directions by means of the adjustable legs.

3.

Inspect the Storage Bin top mounting gasket which should be flat with no wrinkles, to provide a good sealing when the Modular Cuber is installed on top of it.

4.

Place the Modular Cuber on top of Storage bin using care not to wrinkle or tear the gasket.

5.

Lift a little bit the Modular Cuber right side in order to be able to mount the ice level control bracket taking care to align the hole located on unit base to mate with the one on the top of the

Bin.

6.

Remove the PVC plastic plug closing the round hole located on the right side of the ice chute opening.

7.

Trace the ice level control assy, secured for the transport on top of the evaporator of the

Modular Cuber, and direct it down through the round hole into the Storage Bin.

8.

Fasten the ice level control assy on its bracket by means of the two screws found in the hardware package supplied with the unit.

9.

Make a cut (shear) in the PVC plastic plug that goes from its edge to the center; insert the ice level control cable in the center of the plastic plug so to prevent it from any sort of contact with the unit frame, then place again the PVC plug in the round hole keeping the cable exceeding portion inside the unit.

10. Install the plastic ice cube deflector by hooking it on the flange of the ice chute opening in unit base (see illustration).

11. Secure the Modular Cuber on the top of the

Storage Bin using the two bolts and diber washer found in the hardware package supplied with the unit.

D.

ISTACKING INSTALLATION

A Stacking Kit KSC 11 is available as an accessory on request to allow the installation of two Modular Cubers one on top of the other.

The Stacking Kit is consisting of: a) a plastic reinforced Ice Chute Connection b) an Interface P.C. Board enabling to cover any stacking installation combination as: a) MC 16-46 on top of MC 15-45.

b) MC 16-46 on top of MC 16-46.

1.

Unloose the four screws and remove the top panel of bottom machine.

2.

Remove the two plastic plugs from the upper edges of the two side frames of the bottom unit.

3.

Install the MC 16/46 cuber on top of the

MC 15/45 or MC 16/46 placing the four rubber corner plates between the two machines.

4.

Secure them by bolts and nuts supplied with the machine.

5.

Remove the ice chute from both the unit and insert, through the ice discharge opening of the upper unit, the plastic reinforced Ice Chute

Connection.

6.

In case of installation over an MC 45/46 install the additional ice chute connection supplied in the kit.

ATTENTION. The PC Boards installed on the two machines as well as the interface

PC Board supplied in the KSC 11 Kit must be of the same supplier (Syen or

Pro.EI.Ind.).

If not the unit with the different one remains OFF at storage bin full.

7.

Disconnect the ice level control terminal plug from the P.C. Board of the upper Modular

Cuber (now colled secondary).

8.

Secure the interface P.C. Board to the contactor metal bracket of the lower unit (now called primary) by means of the supplied plastic clamp.

9.

Disconnect the ice level control terminal plug from the P.C. Board of the primary unit and connect it to the INLET socket of the interface

P.C. Board (shorter wire).

10. Connect the primary OUTLET terminal plug of the Interface P.C. Board (wire of medium lenght) to the P.C. Board socket of the primary unit.

11. Connect the secondary OUTLET plug

(longer wire) of the interface P.C. Board to the

P.C. Board socket of the secondary unit (see drawing).

Page 9

Page 9

12. Turn the TRIMMER setting screw (located on the front center of P.C. Board) of the ice level control of the secondary unit clockwise to its maximum power (Only on Syen type).

13. The interface P.C. Board is now ready to stop simultaneously the operation of the two units when the infrared beam of the ice level control is interrupted by the stored ice cubes.

E.

ATTENTION. After removal of the ice cubes both units resume their operation starting from the beginning of freezing cycle.

During the first freezing cycle it could be posible that the ice cubes produced by one of the two ice makers be not of correct shape (cloudy and shallow) due to an insufficient water level in its sump tank.

This minor problem will desappear in the next batch because in the harvest cycle the sump tank will be properly filled-up.

14. Place again in their position the two ice chutes and finally re-fit the service panels previously removed.

ELECTRICAL CONNECTIONS

See data plate for current requirements to determine wire size to be used for electrical connections. All SCOTSMAN icemakers require a solid earth wire.

All SCOTSMAN ice machines are supplied from the factory completely pre-wired and require only electrical power connections to the wire cord provided at the rear of the unit.

Make sure that the ice machine is connected to its own circuit and individually fused (see data plate for fuse size).

The maximum allowable voltage variation should not exceed -10% and +10% of the data plate rating. Low voltage can cause faulty functioning and may be responsible for serious damage to the overload switch and motor windings.

NOTE. All external wiring should conform to national, state and local standards and regulations.

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

E.

WATER SUPPLY AND DRAIN

CONNECTIONS

General

When choosing the water supply for the ice flaker consideration should be given to: a) Length of run b) Water clarity and purity c) Adequate water supply pressure

Since water is the most important single ingredient in producting ice you cannot emphasize too much the three items listed above.

Low water pressure, below 1 bar may cause malfunction of the ice maker unit.

Water containing excessive minerals will tend to produce cloudy coloured ice cubes, plus scale build-up on parts of the water system.

Water supply

Connect the 3/4" GAS male fitting of the solenoid water inlet valve, using flexible tubing or a 3/8"

O.D. copper pipe, to the cold water supply line with regular plumbing fitting and a shut-off valve installed in an accessible position between the water supply line and the unit.

Water supply - Water cooled models

The water cooled versions of SCOTSMAN Ice

Makers require two separate inlet water supplies, one for the water sprayed for making the ice cubes and the other for the water cooled condenser.

Connect the 3/4" GAS male fitting of the water inlet, using the flexible tubing or a 3/8" O.D.

copper pipe, to the cold water supply line with regular plumbing fitting and a shut-off valve installed in an accessible position between the water supply line and the unit.

Water drain

The recommended drain tube is a plastic or flexible tube with 18 mm (3/4") I.D. which runs to an open trapped and vented drain. When the drain is a long run, allow 3 cm pitch per meter

(1/4" pitch per foot).

A vent at the unit drain connection is also required for proper sump drainage.

Water drain - Water cooled models

Connect the 3/4" GAS male fitting of the condenser water drain, utilizing a second flexible tubing or a 3/8" O.D. copper tubing, to the open trapped and vented drain.

Page 10

Page 10

NOTE. The water supply and the water drain must be installed to conform with the local code. 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 ambient temperatures are within a minimum of 10

°

C

(50

°

F) even in winter months?

2.

Is there at least a 15 cm (6") clearance around the unit for proper air circulation?

3.

Is the unit level? (IMPORTANT)

4.

Have all the electrical and plumbing connections been made, and is the water supply shut-off valve open?

5.

Has the voltage been tested and checked against the data plate rating?

6.

Has the water supply pressure been checked to ensure a water pressure of at least 1 bar (14 psi).

7.

Have the bolts holding the compressor down been checked to ensure that the compressor is snugly fitted onto the mounting pads?

8.

Check all refrigerant lines and conduit lines to guard against vibrations and possible failure.

9.

Have the bin liner and cabinet been wiped clean?

10. Has the owner/user been given the User

Manual and been instructed on the importance of periodic maintenance checks?

11. Has the Manufacturer’s registration card been filled in properly? Check for correct model and serial number against the serial plate and mail the registration card to the factory.

12. Has the owner been given the name and the phone number of the authorized SCOTSMAN

Service Agency serving him?

G. INSTALLATION PRACTICE

1. Hand shut-off valve

2. Water filter

3. Water supply line (flexible hose)

4. 3/4" gas male fitting

5. Power line

6. Main switch

7/9. Drain fitting

8/10. Vented drain line

11. Open trapped vented drain

WARNING. This icemaker is not designed for outdoor installation and will not function in ambient 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).

Page 11

Page 11

OPERATING INSTRUCTIONS

START UP

After having correctly installed the ice maker and completed the plumbing and electrical connections, perform the following “Start-up” procedure.

A.

Give power to the unit to start it up by switching "ON" the power line main disconnect switch.

NOTE.

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

B.

During the water filling operation, check to see that the incoming water dribbles, through the evaporator platen dribbler holes, down into the sump reservoir to fill it up and also that the incoming surplus of water flows out through the overflow pipe into the drain line.

During the water filling phase the components energized are:

THE WATER INLET SOLENOID VALVE

THE HOT GAS SOLENOID VALVE

THE WATER DRAIN SOLENOID VALVE/S

for the first 30 seconds.

NOTE

. If in the 5 minutes length of the water filling phase the machine sump reservoir does not get filled with water up to the rim of the overflow pipe, it is advisable to check:

1.The water pressure of the water supply line that must be at least 1 bar (14 psig) Minimum

(Max 5 bar-70 psig).

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

3. Any clogging situation in the water circuit like the inlet water strainer and/or the flow control.

C.

At completion of the water filling phase (5 minutes) the unit passes automatically into the

FIG. 1

- EVAPORATOR

16

- CONDENSER

15

- AMBIENT

14

Rx Tx

L

N

13

1

2

ELECTR.

TIMER

TRANSF.

DIP

SWITCH

RELAYS

TRIAC

RELAY

3

4

5

6

7

8

9

10

11

12

WATER DRAIN VALVE

WATER IN VALVE

HOT GAS VALVE

CONTACTOR COIL

FAN MOTOR

WATER PUMP

ELECTRONIC CARD

Page 12

Page 12 freezing cycle with the start up of:

COMPRESSOR

WATER PUMP

FAN MOTOR/S (in air cooled version) controlled by the condensing temperature sensor located within the condenser fins (Fig.2).

In case of condenser clogging such to prevent the proper flow of the cooling air or, in case the fan motor is out of operation or shortage of water in the water cooled condenser, the condenser temperature rises and when it reaches 70

°

C (160

°

F) - for air cooled version

- or 60

°

C (140

°

F) - for water cooled version the condenser temperature sensor shuts-off the ice maker with the consequent light-up of the RED WARNING LED (Fig.3).

OPERATIONAL CHECKS

D.

If necessary install the refrigerant service gauges on both the high side and low side

Schräder valves to check the compressor head and suction pressures.

NOTE.

On air cooled models the condenser temperature sensor, which is located within the condenser fins, keep the head

(condensing) pressure between 16 and 18 bars (225-250 psig).

In the water cooled models the discharge pressure is kept constant at the value of 17 bars (240 psig) by means of a water regulating valve located on the water supply line to the condenser.

After having diagnosed the reason of the rise of temperature and removed its cause, it is necessary to unplug (wait few seconds) and plug in again the unit, thus to put the machine in condition to initiate a new freezing cycle.

The machine restarts with the usual 5 minutes water filling phase in order to provide enough water into the sump tank.

E.

Check to see through the ice discharge opening that the self propeller spray bar is correctly rotating and that the water jets uniformely reach the interior of the inverted mold cups and there is not excessive water spilling through it.

FIG. 2

- EVAPORATOR

16

- CONDENSER

15

- AMBIENT

14

Rx Tx

L

N

13

1

2

ELECTR.

TIMER

TRANSF.

DIP

SWITCH

RELAYS

TRIAC

RELAY

3

4

5

6

7

8

9

10

11

12

WATER DRAIN VALVE

WATER IN VALVE

HOT GAS VALVE

CONTACTOR COIL

FAN MOTOR

WATER PUMP

ELECTRONIC CARD

Page 13

Page 13

F.

The ice making process takes place thereby, with the water sprayed into the molds that gets gradually refrigerated by the heat exchange with the refrigerant flowing into the evaporator serpentine.

During the freezing process, when the evaporator temperature falls below an established value, to

FIG. 3

the evaporator temperature sensor supplies a low voltage power signal to the electronic control device (P.C.BOARD) in order to activate an electronic timer.

This one takes over the control of the freezing cycle up to the complete formation of the ice cubes (Fig.4).

WATER DRAIN VALVE

WATER IN VALVE

- EVAPORATOR

16

- CONDENSER

15

- AMBIENT

14

Rx Tx

L

N

13

1

2

ELECTR.

TIMER

TRANSF.

DIP

SWITCH

RELAYS

TRIAC

RELAY

3

4

5

6

7

8

9

10

11

12

HOT GAS VALVE

CONTACTOR COIL

FAN MOTOR

WATER PUMP

ELECTRONIC CARD

FIG. 4

- EVAPORATOR

16

- CONDENSER

15

- AMBIENT

14

Rx Tx

L

N

13

1

2

ELECTR.

TIMER

TRANSF.

DIP

SWITCH

RELAYS

TRIAC

RELAY

7

8

9

10

3

4

5

6

11

12

WATER DRAIN VALVE

WATER IN VALVE

HOT GAS VALVE

CONTACTOR COIL

FAN MOTOR

WATER PUMP

ELECTRONIC CARD

Page 14

Page 14

NOTE.

The length of the entire freezing cycle is governed by the evaporator temperature sensor which has its brobe placed in contact with the evaporator serpentine (Non adjustable) in combination with the electronic timer (Adjustable) incorporated in the P.C.

BOARD).

The timer adjustment is factory set in consideration of the ice maker model, cooling version and ice cube size (Small, Medium,

Large).

It is possible, however, to modify the timed length of the freezing cycle, by changing the

DIP SWITCH keys setting.

In Table B of PRINCIPLE OF OPERATION are shown the various time extensions of the freezing cycle second phase, in relation with the different DIP SWITCH keys settings.

The electrical components in operation are:

COMPRESSOR

WATER PUMP

WATER INLET SOLENOID VALVE

HOT GAS VALVE

WATER DRAIN SOLENOID VALVE/S

for the first 30 seconds.

NOTE. The length of the defrost cycle is related to the length of the second phase of freezing cycle T2. (Time to drop the evaporating temperature from 0

°

C (32

°

F) small Red LED blinking-to-15

°

C (5

°

F) small

Red LED ON steady.

It is possible to extend the length of the defrost cycle by changing the setting of DIP SWITCH

7 and 8 as shown on table at page 24.

G.

After about 17-20 minutes from the beginning of the freezing cycle, in an hypothetic ambient temperature of 21

°

C , the defrost cycle takes place with the hot gas and the water inlet valves being simoultaneously activated (Fig.5).

H.

Check, during the defrost cycle, that the incoming water flows correctly into sump reservoir in order to refill it and that the surplus overflows through the overflow drain tube.

FIG. 5

- EVAPORATOR

16

- CONDENSER

15

- AMBIENT

14

Rx Tx

L

N

13

1

2

ELECTR.

TIMER

TRANSF.

DIP

SWITCH

RELAYS

TRIAC

RELAY

7

8

9

10

3

4

5

6

11

12

WATER DRAIN VALVE

WATER IN VALVE

HOT GAS VALVE

CONTACTOR COIL

FAN MOTOR

WATER PUMP

ELECTRONIC CARD

Page 15

Page 15

I.

Check the texture of ice cubes just released.

They have to be in the right shape with a small depression of about 5-6 mm in their crown.

If not, wait for the completion of the second cycle before performing any adjustment.

If required, the length of the timed freezing cycle can be modified by changing the DIP SWITCH keys setting as illustrated in OPERATING

PRINCIPLE.

If the ice cubes are shallow and cloudy, it is possible that the ice maker runs short of water during the freezing cycle second phase or, the quality of the supplied water requires the use of an appropriate water filter or conditioner.

J.

To be sure of the correct operation of ice level control device, place one hand between its sensing “eyes” to interrupt the light beam.

The Bin Full YELLOW LED starts to blink, and after 60 seconds, the unit stops with the simultaneous glowing of the same LED to monitor the BIN FULL situation (Fig.6).

Take the hand out from the ice level control sensors to allow the resumption of the light beam.

The BIN FULL YELLOW LED blinks fast and after approximately 6 seconds the ice maker resume its operation with the immediate glowing of the FIRST YELLOW LED indicating UNIT IN

OPERATION and the extinguishing of the “BIN

FULL” YELLOW LED.

NOTE.

The ICE LEVEL CONTROL

(INFRARED SYSTEM) is independent of the temperature however, the reliability of its detection can be affected by external light

radiations or by any sort of dirt and scale sediment which may deposit directly on the light source and on the receiver.

To prevent any possible ice maker malfunction, due to negative affection of the light detertor, it is advisable to locate the unit where it is not reached by any direct light beam or light radiation, also it is recommended to keep the bin door constantly closed and to follow the instructions for the periodical cleaning of the light sensor elements as detailed in the MAINTENANCE AND

CLEANING PROCEDURES.

K.

Remove, if previously installed, the refrigerant service gauges and re-fit the unit service panels previously removed.

L.

Instruct the owner/user on the general operation of the ice machine and about the cleaning and care it requires.

FIG. 6

- EVAPORATOR

16

- CONDENSER

15

- AMBIENT

14

Rx Tx

L

N

13

1

2

ELECTR.

TIMER

TRANSF.

DIP

SWITCH

RELAYS

TRIAC

RELAY

3

4

5

6

7

8

9

10

11

12

WATER DRAIN VALVE

WATER IN VALVE

HOT GAS VALVE

CONTACTOR COIL

FAN MOTOR

WATER PUMP

ELECTRONIC CARD

Page 16

Page 16

PRINCIPLE OF OPERATION

How it works

In the SCOTSMAN Modular Cubers the water used to make the ice is kept constantly in circulation by an electric water pump which primes it to the self propeller spray bar nozzles from where it is diverted into the inverted mold cups of the evaporator (Fig. B).

A small quantity of the sprayed water freezes into ice; the rest of it cascades by gravity into the sump assembly below for recirculation.

FREEZING CYCLE (Fig. A)

The hot gas refrigerant discharged out from the compressor reaches the condenser where, being cooled down, condenses into liquid. Flowing into the liquid line it passes through the drier filter, then it goes all the way through the capillary tube where, due to the heat exchanging action, it looses some of its heat content so that its pressure and temperature are lowered as well.

Next the refrigerant enters into the evaporator serpentine (which has a larger I.D. then the capillary) and starts to boil off; this reaction is emphasized by the heat transferred by the sprayed water.

The refrigerant then increases in volume and changes entirely into vapor.

The vapor refrigerant then passes through the suction accumulator (used to prevent that any small amount of liquid refrigerant may reach the compressor) and through the suction line. In both the accumulator and the suction line it exchanges heat with the refrigerant flowing into the capillary tube (warmer), before to be sucked in the compressor and to be recirculated as hot compressed refrigerant gas.

The freezing cycle is controlled by the evaporator temperature sensor (which has its probe in contact with the evaporator serpentine) that determines the length of its first portion of the cycle.

When the temperature of the evaporator serpentine drops to a pre-set value, the evaporator sensor probe changes its electrical resistance allowing a low voltage current (12 volts) to flow to the P.C. BOARD which in turn activates an electronic timer.

The timer, which is built-in the P.C. BOARD, takes over from the evaporator temperature sensor, the control of the freezing cycle up to its completion.

NOTE.

The change of the electric potential of the evaporator sensor with the consequent activation of the timer (Time mode) is signalled by the glowing-up of the RED LED located beside the FREEZING yellow one in the front of the P.C. BOARD.

ATTENTION. In case, after 15 minutes from the beginning of the freezing cycle, the temperature of the evaporator sensor probe is higher then 0

°

C (32

°

F) (shortage of refrigerant, inoperative hot gas valve, etc.) the P.C. BOARD switch OFF immediately the unit with the simultaneous blinking of the WARNING

RED LED.

The length of this second portion of the freezing cycle is pre-fixed and related to the setting of the first four DIP SWITCH keys.

The DIP SWITCH keys setting is made in consideration of the type of condenser used.

In Table B are indicated the various lengths of the second portion of freezing cycle (Time mode) in relation to the different combinations of the DIP

SWITCH KEYS.

In Table A herebelow are illustrated the DIP

SWITCH key combinations for the three different factory.

TAB. A

DIP SWITCH FACTORY SETTING COMBINATIONS PER MODEL AND VERSION

DIP SWITCH

MCS 16-46 A

MCS 16-46 W

MCM 16 A

MCM 16 W

MCM 46-1210 A

MCM 46-1210 W

MCL 16-46-1210 A

MCL 16-46-1210 W

MCXL 46 W

1

ON

ON

OFF

ON

ON

OFF

ON

ON

OFF

FREEZING CYCLE

2

OFF

OFF

ON

ON

ON

ON

ON

ON

ON

3

ON

ON

OFF

OFF

OFF

OFF

ON

ON

OFF

4

ON

ON

ON

ON

ON

ON

OFF

OFF

OFF

DEFROST CYCLE

5

ON

ON

ON

ON

ON

ON

ON

ON

OFF

6

OFF

OFF

OFF

OFF

OFF

OFF

OFF

OFF

ON

DEFR. CYCLE

ADD. TIME

7

8

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

OFF

15/30

°

9

ON

ON

ON

ON

ON

ON

ON

ON

ON

AIR

WATER

10

ON

OFF

ON

OFF

OFF

ON

OFF

ON

OFF

Page 17

Page 17

Page 18

Page 18

The electrical components in operation during the freezing cycle are:

COMPRESSOR

FAN MOTOR (in air cooled version)

WATER PUMP

CONTACTOR COIL

and during the second phase of freezing cycle

(Time mode) they are joined by the

ELECTRONIC TIMER

The refrigerant head pressure, in the course of the freezing cycle, ranges between 18 and 16 bars (250-225 psig) being controlled by the temperature sensor probe located within the condenser fins (air cooled version) or, on the condenser tube coil (water cooled version).

On the air cooled version, the condenser temperature sensor, when senses a rising of the condenser temperature beyond the pre-fixed limit, changes its electrical resistance and send a low voltage power flow to the Micro Processor of

P.C. BOARD which in turn energizes, through a

TRIAC, the FAN MOTOR.

When the opposite situation occures, i.e. the condenser temperature gets below the pre-fixed limit, the temperature sensor changes again its electrical resistance reducing therefore the current flow to the P.C. BOARD to cause the fan motor temporary cut-off.

NOTE. On this model the condenser sensors are used just to switch off the unit in case the condensing temperature rise up to more then

70

°

C (for air cooled version) or more then

62

°

C (for water cooled version) for one of the following abnormal reasons:

CLOGGED CONDENSER (Air cooled version)

FAN MOTOR OUT OF OPERATION (Air cooled version)

INSUFFICIENT FLOW OF COOLING

WATER (Water cooled version)

AMBIENT TEMPERATURE HIGHER THEN

40

°

C (100

°

F)

it causes the total and immediate SHUT-OFF of the machine in order to prevent the unit from operating in abnormal and dangerous conditions.

When the ice maker stops on account of this protective device, there is a simultaneous glowing of the RED LED, warning the user of the Hi Temperature situation.

After having efiminated the source of the condenser hi-temperature, to restart the machine just switching OFF and ON the unit at main line switch.

The ice machine resumes its normal operation by going through the 5 minutes water filling phase.

At the start of the freezing cycle the refrigerant suction or lo-pressure lowers rapidly to 2.5 bars-

35 psig then it declines gradually - in relation with the growing of the ice thickness - to reach, at the end of the cycle, approx. 1.6

÷

1.7 bar - 22

÷

24

psig with the cubes fully formed in the cup molds.

The total length of the freezing cycle ranges f rom

20 to 25 minutes.

DEFROST OR HARVEST CYCLE (Fig. D)

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

ATTENTION. In case the unit be able to reach 0

°

C (32

°

F) evaporating temperature within 15 minutes, but after 45 minutes from the beginning of the freezing cycle it has not yet reached the evaporator temperature of -15

°

C (5

°

F) the machine goes straight into the defrost cycle omitting the timed portion of the freezing cycle relied to the setting of the first four DIP

SWITCHES.

NOTE. The length of the defrost cycle is related to the length of the second phase of freezing cycle T2. (Time to drop the evaporating temperature from 0

°

C (32

°

F) small Red LED blinking-to-15

°

C (5

°

F) small

Red LED ON steady.

It is possible to extend the length of the defrost cycle by changing the setting of DIP SWITCH

7 and 8 as shown on table at page 24.

The electrical components in operation during this phase are:

COMPRESSOR

CONTACTOR COIL

WATER INLET VALVE

HOT GAS VALVE

WATER DRAIN VALVE

and the

WATER PUMP

on the first 30 seconds.

The incoming water, passing through the water inlet valve and the flow control, runs over the evaporator platen and then flows by gravity through the dribbler holes down into the sump/ reservoir (Fig. D).

The water filling the sump/reservoir forces part of the surplus water from the previous freezing cycle to go out to the waste through the overflow pipe. This overflow limits the level of the sump water which will be used to produce the next batch of ice cubes.

Page 19

Page 19

Meanwhile, the refrigerant as hot gas, discharged from the compressor, flows through the hot gas valve directly into the evaporator serpentine bypassing the condenser.

The hot gas circulating into the serpentine of the evaporator warms up the copper molds causing the defrost of the ice cubes. The ice cubes, released from the cups, drop by gravity onto a slanted cube chute, then through a curtained opening they fall into the storage bin.

At the end of the defrost cycle, both the hot gas and the water inlet valves close and the machine starts again a new freezing cycle.

OPERATION - CONTROL SEQUENCE

At the start of freezing cycle, the evaporator temperature sensor controls the length of the first part of the freezing cycle. As it reaches a predetermined temperature, it supplies a low voltage current to the P.C. BOARD in order to activate the electronic timer which, takes over the control of the freezing cycle for a pre-fixed time, according to the DIP SWITCH keys setting

(see Tab. B).

NOTE. The evaporator temperature sensor, factory pre-set, is the same for all the models and is not adjustable.

Once completed the freezing cycle 2nd phase the system goes automatically into the defrost cycle which also has a pre-fixed length. At completion of the defrost cycle the P.C. BOARD commands the unit to start again a new freezing cycle.

OPERATION - ELECTRICAL SEQUENCE

The following charts illustrate which switches and which components are ON or OFF during a partÌcular phase of the icemaking cycle.

TIMED FREEZE

Electrical components (Loads) .

ON OFF

Compressor ..................................

Fan Motor (Air cooled only) and TRIAC

Hot Gas Valve ..............................

Inlet Water Valve ..........................

P.C. Board Relay 1 Coil ...............

• •

P.C. Board Relay 2 & 3 Coil .........

Water Pump .................................

Contactor Coil ..............................

Electronic Timer ...........................

Electronic Controls & Sensors . ON OFF

Evaporator Sensor .......................

Condenser Sensor .......................

Ice Level Control ..........................

• •

HARVEST (Drain portion - first 30 sec.)

Electrical components (Loads) .

ON OFF

Compressor ..................................

Fan Motor (Air cooled only) and TRIAC .

Hot Gas Valve ..............................

Water Inlet Valve ..........................

Water Drain Valve ........................

P.C. Board Relay 1 & 2 Coil .........

P.C. Board Relay 3 Coil ...............

Water Pump .................................

Contactor Coil ..............................

P.C.B. Timer .................................

BEGINNIING FREEZE

Electrical components (Loads) .

ON OFF

Compressor ..................................

Fan Motor (Air cooled only) and TRIAC

Hot Gas Valve ..............................

Inlet Water Valve ..........................

P.C. Board Relay 1 Coil ...............

P.C. Board Relay 2 & 3 Coil .........

Water Pump .................................

Contactor Coil ..............................

Electronic Timer ...........................

Electronic Controls & Sensors ..

ON OFF

Evaporator Sensor .......................

Condenser Sensor .......................

Ice Level Control ..........................

HARVEST (Water filling portion)

Electrical components (Loads) .

ON OFF

Compressor ..................................

Fan Motor (Air cooled only) and TRIAC .

Hot Gas Valve ..............................

Water Inlet Valve ..........................

Water Drain Valve ........................

P.C. Board Relay 1 & 2 Coil .........

P.C. Board Relay 3 Coil ...............

Water Pump .................................

Contactor Coil ..............................

P.C. Board Timer .........................

Electronic Controls & Sensors .

ON OFF

Evaporator Sensor .......................

Condenser Sensor .......................

Ice Level Control ..........................

Page 20

Page 20

Freeze Cycle

Average Discharge

Pressure A/C: 16

÷

18 bars (225

÷

250 psig)

Average Discharge

Pressure W/C: 17 bars (240 psig)

Suction Pressure End

Freeze Cycle: 1.6

÷

1.7 bar (22

÷

24 psig)

The activation of the electronic timer (-15

°

C -

5

°

F) is monitored by the lighting up of the RED

LED placed in the front of the P.C. BOARD.

This lighting up occures usually in the mid period of the freezing cycle and signals the switching from the first to the second phase of the freezing cycle.

NOTE. Whenever, after 15 minutes from the beginning of the freezing cycle, the evaporating temperature have not yet reached the value of 0

°

C (32

°

F), the P.C.

BOARD switches OFF the machine with the

BLINKING of RED LED.

REFRIGERANT CHARGE (R 404 A)

MC 16

Air Cooled

640 gr

MC 46

1300 gr

MC 46 (60 Hz) 1040 gr

Water Cooled

500 gr

700 gr

560 gr

NOTE. Before charging the refrigerant system always check the type of refrigerant and quantity as specified on the individual ice machine dataplate.

The refrigerant charges indicated are related to average operating conditions.

WARNING. As R 404 a is a band of different types of refrigerants it is imperative to charge the system only in liquid phase in order to avoid to alter their mix-up percentage.

B.

CONDENSER TEMPERATURE SENSOR

The condenser temperature sensor probe, located within the condenser fins (air cooled version) or in contact with the tube coil (water cooled version) detects the condenser temperature variations and signals them by supplying current, at low voltage, to the P.C. BOARD.

In the air cooled versions, in relation to the different current received, the micro processor of the P.C. BOARD supplies, through a TRIAC, the power at high voltage to the fan motor so to cool the condenser and to reduce its temperature.

In case the condenser temperature rises and reaches 70

°

C (1 60

°

F) - on air cooled models - or

62

°

C (145

°

F) - on water cooled models - the current arriving to the micro processor is such to cause an immediate and total stop of the machine operation.

COMPONENTS DESCRIPTION

A.

EVAPORATOR TEMPERATURE

SENSOR

The evaporator temperature sensor probe, located in contact with the evaporator serpentine, detects the dropping of the evaporator temperature during the freezing cycle and signals it by supplying a current flow to the micro processor of

P.C. BOARD.

According to the current received, the evaporator sensor supplies power to the P.C. BOARD first, when it reachs 0

°

C (32

°

F), second at -15

°

C (5

°

F); in this second case it supply power to the electronic timer built into the P.C. BOARD so that it may take control of the fength of the 2nd phase of freezing cycle.

The length of the timed phase is pre-f ixed by the setting of the keys 1, 2, 3 and 4 of the DIP

SWITCH.

C.

ICE BIN LEVEL LIGHT CONTROL

The electronic ice bin level control, located into the storage bin, has the function to stop the operation of the ice machine when the light beam between the light source and the sensor is interrupted by the ice cubes stored into the bin.

When the light beam is interrupted the Bin Full

YELLOW LED starts to blink; in case the light beam is constantly interrupted for more than 60 seconds, the ice machine stops with the glowingup of the Bin Full YELLOW LED to monitor the situation of ice bin full.

The 60 seconds of delay prevent that an ice scoop movement or the ice dropping through the ice chute (interrupting for a while the light beam) can stop the operation of the unit.

Six seconds after the scoop out of the ice (with the resumption of the light beam between the two infrared sensor of ice level control - YELLOW

LED blinks fast) the ice machine restarts again with the extinguishing of the YELLOW LED.

Page 21

Page 21

D.

P.C. BOARD (Data processor)

The P.C. BOARD, fitted in its plastic box located in the front of the unit, consists of two separated printed circuits one at high and the other at low voltage integrated with two fuses one on power in

(32mA) and one on power out (6.3 A), of four aligned LEDS monitoring the operation of the machine, of one extra monitoring RED LED

(blink 0

°

C - steady - 15

°

C), of one DIP SWITCH with ten keys, of one push button, of input terminals for the leads of the sensor probes and input and output terminals for the leads of the ice maker electrical wires.

The P.C. BOARD is the brain of the system and it elaborates, through its micro processor, the signals received from the three sensors in order to control the operation of the different electrical components of the ice maker (compressor, water pump, solenoid valves, etc.).

0

°

C-BLINKING

-13

°

C-STEADY

RESET PUSH BUTTON

MICROPROCESSOR

FREEZING

WATER PUMP

RELAY

COMPRESSOR

I/R ADJUSTER

EVAPORATOR

SENSOR SOCKET

CONDENSER

SENSOR SOCKET

OPTICAL ICE LEVEL

CONTROLSENSOR

TERMINAL

BOARD

HOT GAS, WATER

INLET AND PURGE

E.

PUSH BUTTON OPERATION

DURING WATER FILLING PHASE

• Push for more then 2” but less then 5” the machine enters in Cleaning Mode

• Push for more then 5” the machine by-pass the Water Filling Phase

DURING FREEZING/HARVEST CYCLE

• Push for more then 5” during the Freezing cycle the machine goes immediately into Harvest

• Push for more then 5” during the Harvest cycle the machine enters immediately in the Freezing cycle

The length of Harvest is equal to:

• 35” if Push Button is activated before -15

°

C evaporating temperature LED activation

• As per Harvest cycle chart, if Push Button is activated after -15

°

C evaporating temperature LED activation (Red LED inside

PC Board ON steady)

FREEZING CYCLE

TOO HI COND TEMP

TOO HI EVAP TEMP

BIN FULL

POWER

PUSH

BUTTON

F.

LED MEANING

GREEN LED ON

Unit under power

YELLOW BIN FULL LED ON

Unit shut-OFF at storage bin full

YELLOW BIN FULL LED BLINKING SLOW

Infrared beam break out

YELLOW BIN FULL LED BLINKING FAST

Infrared beam in again

Page 22

Page 22

RED ALARM LED ON

Too hi condensing temperature

RED ALARM LED BLINKING

Too hi evaporating temperature

YELLOW FREEZING CYCLE ON

Unit in freezing cycle mode

YELLOW FREEZING OR BIN FULL AND RED

ALARM LED ON

Condenser sensor out of order

YELLOW FREEZING OR BIN FULL AND RED

ALARM LED BLINKING

Evaporator sensor out of order

G.

DIP SWITCH

The P.C.BOARD which controls the entire operation of the ice maker, has a DIP SWITCH

with ten switching keys which allow to set up the micro processor program in order to extend or to shorten the length of freezing cycle in relation to the different model and versions of ice machines.

The DIP SWITCH first four keys setting

determines the length of the 2nd phase of freezing cycle (controlled by the electronic timer) as detailed in the table B.

The DIP SWITCH keys 5 & 6 setting determines the length of the defrost cycle according to the size of the cubes (Large or Medium) as per the following setting:

ON ON : PROGRAM A

ON OFF : PROGRAM B

OFF OFF : PROGRAM C

OFF ON : PROGRAM D

LENGTH OF HARVEST CYCLE

ACCORDING TO THE TIME TO DROP THE

EVAP. TEMPERATURE FROM 0

°

C TO -15

°

C

LENGTH

HARVEST

CYCLE A

180”

Up to 6’30”

165”

150”

135”

6’30”-7’

7’-8’

8’-9’

B

***

Up to 3’

3’-3’15’

3’15”-3’30”

PROGRAMS

C

Up to 9’30”

9’30”-10’

10’-11’

11’-12’

120”

9’-10’30”

3’30”-4’30” 12’-13’30”

105”

10’30”-12’

4’30”-6’ 13’30”-15’

90”

>12’

>6’ >15’

D

xxxx xxxx xxxx xxxx

< 3'

3' - 4'

> 4'

TAB. B

The DIP SWITCH N

°

7 and 8 allow the extention of the length of the harvest/defrost cycle according to their combination as per following chart:

DIP SWITCH ADDITIONAL DEFROST TIME

7

ON

OFF

ON

OFF

8

ON

ON

OFF

OFF

0

30"

60"

90"

The 9th key is used to supply power to the water pump 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-OUT condensing temperature from 70

°

C (160

°

F) for the air cooled versions - ON position - to 60 versions.

°

C

(140

°

F) - OFF position - for the water cooled

H.

WATER SPRAY SYSTEM

Through its nozzles, the water pumped, is sprayed in each individual cup to be frozen into ice.

It consists of one spray tube wheve are located several spray nozzles.

I.

WATER PUMP

The water pump operates continually throughout the freezing cycle and on the first 15 or 30 seconds of the defrost cycle so to such the remaining water from the sump tank (reach in mineral salts) and drain it out.

During the freezing cycle the pump primes the water from the sump to the spray system and through the spray nozzles sprays it into the inverted cup molds to be frozen into crystal clear ice cubes.

It is recommended that the pump motor bearings be checked at least every six months.

LENGTH OF TIMED PORTION OF FREEZING CYCLE ACCORDING TO THE

DIP SWITCH SETTING COMBINATIONS

Page 23

Page 23

J.

WATER INLET SOLENOID VALVE -

3/4 GAS MALE FITTING

The water inlet solenoid valve is activated by the micro processor of the P.C. BOARD during the first 5 minutes of water filling phase and as well during the defrost cycle.

When energized it allows a metered amount of incoming water to flow overt he evaporator cavity to assist the hot gas in defrosting the ice cubes.

The water running over the evaporator cavity drops by gravity, through the dribbler holes of the platen, into the sump reservoir where it will be sucked by the water pump and primed to the spray system.

K.

HOT GAS SOLENOID VALVE

The hot gas solenoid valve consists basically in two parts: the valve body and the valve coil.

Located on the hot gas line, this valve is energized through the micro processor of P.C. BOARD during the defrost cycle and as well during the water filling phase.

During the defrost cycle the hot gas valve coil is activated so to attract the hot gas valve piston in order to give way to the hot gas discharged from the compressor to flow directly into the evaporator serpentine to defrost the formed ice cubes.

M.

COMPRESSOR

The hermetic compressor is the heart of the refrigerant system and it is used to circulate and retrieve the refrigerant throughout the entire system. It compresses the low pressure refrigerant vapor causing its temperature to rise and become high pressure hot vapor which is then released through the discharge valve.

N.

WATER REGULATING VALVE

(Water cooled version)

This valve controls the head pressure in the refrigerant system by regulating the flow of water going to the condenser.

As pressure increases, the water regulating valve opens to increase the flow of cooling water.

O.

CONTACTOR

Placed outside of the control box it is controlled by the P.C. BOARD in order to close or open the electrical circuit to the compressor.

L. FAN MOTOR (Alir cooled version)

The fan motor is controlled through the P.C.

BOARD and the TRIAC by the condenser temperature sensor. Normally it operates only during the freezing cycle to draw cooling air through the condenser fins.

In the second part of the freezing cycle, the fan motor can run at intermittance as the condenser pressure must be kept between two corresponding head pressure values (16

÷

18 bars-

225

÷

250 psig).

P.

WATER DRAIN SOLENOID VALVE

The water drain solenoid valve, electrically connected in parallel to the water inlet and to the hot gas solenoid valves, is energized for all the length of the defrost cycle.

By means of the water pump, that remains energized for 30 seconds at the beginning of the defrost cycle, it allows the drain out of all remaining water (rich of minerals deposited during the previous freezing cycle) from the sump tank.

By doing so it allows to the ice maker to make every new freezing cycle with new fresh water, avoiding thereby the accumulation of sediments and scales, which soon or later will cause the partial or total clogging of the water system on the unit.

Page 24

Page 24

ADJUSTMENT, REMOVAL AND REPLACEMENT

PROCEDURES

A.

ADJUSTMENT OF THE CUBE SIZE

CAUTION. Before performing actual adjustment of the cube size, check other possible causes for cube size problems, refer to the Service Diagnosis Section for problem review and analysis.

Do not perform any adjustment till the icemaking system has progressed through severaÏ complete freezing and harvest cycle, to observe size and quality of ice cubes and whether or not the cube size problem exists.

I.

lf the cubes are shallow size (Indentation is too deep) probably the length of the second phase of the freezing cycle is too short so, to extend such length you have to:

1.

Locate the DIP SWITCH on the front of the

P.C. Board.

2.

Take note of thecombination of the first four

DIP SWITCH KEYS and check the corrisponding length of freezing cycle 2nd phase on Table B.

3.

Change the same DIP SWITCH KEYS setting so that it will correspond to the combination on table B pre-ceding the one remarked at step 2.

This will allow an extension of the freezing cycle of two more minutes.

4.

Observe the ice cubes in the next two harvests and eventually repeat steps 2 and 3 above until proper ice cubes size is achieved.

See figure.

SMALL

IDENTATION

NORMAL SIZE-SHAPE

LITTLE OR NO

ICE IN CENTER

OF CUBES

SHALLOW SIZE

II.

lf the cubes are oversize size (Indentation is too full) probably the length of the second phase of the freezing cycle is too long.

To shorten such length you have to:

1 .

Locate the DIP SWITCH on the front of the

P.C. Board.

2.

Take note of the combination of the first four

DIP SWITCH KEYS and check the corrisponding length of freezing cycle 2nd phase on Table B.

3.

Change the same DIP SWITCH KEYS setting so that it will correspond to the combination on table B coming next to the one remarked at step 2.

This will reduce an the freezing cycle length of two minutes.

THICK BULGE

SOLID ICE

OVER SIZE

4.

Observe the ice cubes in the next two harvests and eventually repeat steps 2 and 3 above until proper ice cubes size is achieved.

See figure.

Page 25

Page 25

WIRING DIAGRAM

MC-16 A-W

230/50/1 - 240/50/1 - 115/60/1

B - WHITE

G - GREY

N - BLACK

A - BLUE

M - BROWN

GV - YELLOW GREEN

Page 26

Page 26

WIRING DIAGRAM

MC-16 A-W

220/50-60/3 - 400/50/3 + N

B - WHITE

G - GREY

N - BLACK

A - BLUE

M - BROWN

GV - YELLOW GREEN

Page 27

Page 27

WIRING DIAGRAM

MC-46 A-W

230/50/1 - 240/50/1

B - WHITE

G - GREY

N - BLACK

A - BLUE

M - BROWN

GV - YELLOW GREEN

Page 28

Page 28

WIRING DIAGRAM

MC-46 A-W

220/50-60/3 - 400/50/3 + N

B - WHITE

G - GREY

N - BLACK

A - BLUE

M - BROWN

GV - YELLOW GREEN

Page 29

Page 29

SERVICE DIAGNOSIS

SYMPTOM

Unit will not run

(No warning LEDS glows)

(Green LED-Power ON glows)

(Bin full LED glows)

(Red-alarm LED glows)

(Red-alarm LED blinks)

POSSIBLE CAUSE SUGGESTED CORRECTION

Blown power in fuse in P.C.Board

Replace fuse & check for cause of blown fuse

Main switch in OFF position

Inoperative P.C.Board

Loose electrical connections

Turn switch to ON position

Replace P.C.Board

Check wiring

Blown power out fuse in P.C. Board Replace fuse & check for cause of blown fuse

Inoperative ice level control

Inoperative P.C.Board

Clean or replace ice level control

Replace P.C.Board

High head pressure

High evaporating temperature after 15 mins. beginning freeze

Condenser sensor out of order

Dirty condenser. Clean

Inoperative fan motor. Replace

Shortage of water (WC)

Hot gas valve leak - Replace it.

Water inlet valve leak - Replace it.

Short of refrigerant.

Compressor cycles intermittently

Replace it (Freezing or Bin Full LED +

Red-alarm LED glow)

(Freezing or Bin Full LED +

Red-alarm LED blink)

Evaporator sensor out of order

Compressor cycles intermittently Low voltage

Contactor with burnt contacts

Non-condensable gas in system

Compressor starting device with loose wires

Mechanical problem

Replace it

Check circuit for overloading

Check voltage at the supply to the building. If low, contact the power company

Replace it

Purge the system

Check for loose wires in starting device

Replace compressor

Cubes too small

Cloudy cubes

Shortage of water

Freezing cycle too short

Capillary tube partially restricted

Moisture in the system

Shortage of refrigerant

Review setting of DIP SWITCH keys

Blow charge, add new gas & drier, after evacuating systemwithvacuum pump

Same as above

Check for leaks & recharge

Shortage of water

Dirty water supply

Accumulated impurities

Water spilling out through curtain

Water solenoid valve not opening

Water leak in sump area

Water flow control plugged

Leak of water drain valve

See remedies for shortage of water

Use water softner or water filter

Use SCOTSMAN Ice Machine cleaner

Check or replace curtain

Replace valve

Locate and repair

Replace water inlet valve

Replace valve

Page 30

SERVICE DIAGNOSIS

SYMPTON

Irregular cubes size & some cloudy

Cubes too large

Decreased ice capacity

Poor harvest

Unit won’t harvest

Incorrect discharge pressure

Excessive water in unit base

Page 30

POSSIBLE CAUSE

Some jets plugged

Shortage of water

Unit not level

Spray bar not rotating

SUGGESTED CORRECTION

Remove spray bar & jet bearing and clean them

See shortage of water

Level as required

Remove spray bar & jet bearing and clean them

Review setting of DIP SWITCH keys

Replace sensor

Freezing cycle too long

Inoperative evaporator sensor

Inefficient compressor

Leaky water valve

Overcharge of refrigerant

Capillary tube partially restricted

Replace

Repair or replace

Non-condensable gas in system Purge the system

Poor air circulation or excessive Relocate the unit or provide for hot location (Red-alarm LED glows) more ventilation

Correct the charge. Purge off slowly

Blow charge, add new gas & drier, after evacuating system with vacuum pump

Hot gas solenoid valve leaking

Short of refrigerant

Replace valve

Charge to data plate indication

Discharge head pressure too high See incorrect discharge pressure

Restriction in incoming water line

Water inlet valve not opening

Check water valve strainer and flow control. If necessary enlarge the flow control orifice

Valve coil with open winding

Replace valve

Replace hot gas valve assy Hot gas valve orifice restricted

Clogged air vented holes in mold cups Clean out holes plugged

Discharge head pressure too low See incorrect discharge pressure

Inoperative P.C.Board

Hot gas valve not opening

Water solenoid valve not opening

Replace P.C.Board

Valve coil with open winding

Replace valve

Valve coil with open winding

Replace valve

Inoperative condenser sensor Replace sensor

Inoperative P.C.Board

Replace P.C.Board

Water regulating valve misadjusted Adjust its setting stem

Water tubing leaking Check. Tighten or replace

Page 31

Page 31

MAINTENANCE AND CLEANING INSTRUCTIONS

A.

GENERAL

The periods and the procedures for maintenance and cleaning are given as guides and are not to be construed as absolute or invariable.

Cleaning, especially, will vary depending upon local water and ambient conditions and the ice volume produced; and, each icemaker must be maintened individually, in accordance with its particular location requirements.

B. ICEMAKER

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

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.

Clean the water system, evaporators, bin and spray bar/s using a solution of SCOTSMAN

Ice Machine Cleaner.

Refer to procedure C cleaning instructions and after cleaning will indicate frequency and procedure to be followed in local areas.

4.

Reach the water spray bar from the inside of the freezing chamber lifting it from its seat with its bottom race washer.

NOTE. Cleaning requirements vary according to the local water conditions and individual user operation. Continuous check of the clarity of ice cubes and visual inspection of the water spraying parts before and after cleaning will indicate frequency and procedure to be followed in local areas.

5.

With the ice machine and fan motor OFF on air cooled models, clean condenser using vacuum cleaner, whisk broom or non metallic brush taking care to do not damage both the condenser and ambient temperature sensor probes.

6.

Check for water leaks and tighten drain line connections. Pour water down through the storage bin drain line to be sure that drain line is open and clear.

7.

Check size, condition and texture of ice cubes. Perform adjustment of DIP SWITCH keys as required.

8.

Check the ice level control sensor to test shut-off. Put some ice cubes between the light source and the receiver so to cut off the light beam for at least one minutes.

This should cause the ice maker to shut off and the light-up of the 2nd LED (yellow light).

IMPORTANT. Perform the above check only at the end of harvest cycle or at the beginning of freezing cycle in order to do not cause to the unit to make a double freezing cycle.

NOTE. Within few seconds after the removal of the ice cubes from the Infrared sensing light the icemaker restarts in freezing cycle.

The ice level control uses devices that sense light, therefore they must be kept clean enough so they can "see".

Every month clean/wipe the sensing "eyes" with a clean soft cloth.

Dip it into a tray filled with cleaning solution then rinse it under a tap water stream.

With a pick clean the orifice of the water stream jet that propells the spray bar.

9. Check for refrigerant leaks.

Page 32

Page 32

C.

CLEANING INSTRUCTIONS OF

WATER SYSTEM

1.

Remove left, center and right front panels to gain access either to the control box and to the evaporator.

2.

Wait till the end of defrost cycle then turn the unit OFF by the main switch (disconnect power supply).

3.

Prepare for each freezing chamber the cleaning solution by diluting in a plastic container two or three liters of warm water (45

°

-50

°

C) with a 0,2-0,3 liters of SCOTSMAN Ice Machine

Cleaner.

WARNING. The SCOTSMAN Ice Machine

Cleaner contains Phosphoric and

Hydroxyacetic acids. These compounds are corrosive and may cause burns if swallowed, DO NOT induce vomiting.

Give large amounts of water or milk. Call

Physician immediatelly. In case of external contact flush with water. KEEP

OUT OF THE REACH OF CHILDREN

4.

Scoop out all the ice cubes stored into the bin in order to prevent them from being contaminated with the cleaning solution then flush out the water from the sump reservoir by bending down the vertical sump drain hose.

5.

Remove the evaporator cover then slowly pour onto the evaporator piaten the cleaning solution- With the help of a brush dissolve the most resistant and remote scale deposits in the platen.

Perform the same for all the four evaporators.

6.

Give power to the unit by the main switch.

7.

During the Water Filling Phase push RESET

BUTTON for more then 2” but less then 5” the machine enter in Cleaning Mode (Fig.7)

FIG. 7

- EVAPORATOR

16

- CONDENSER

15

- AMBIENT

14

Rx Tx

L

N

13

1

2

ELECTR.

TIMER

TRANSF.

DIP

SWITCH

RELAYS

TRIAC

RELAY

7

8

9

10

3

4

5

6

11

12

WATER DRAIN VALVE

WATER IN VALVE

HOT GAS VALVE

CONTACTOR COIL

FAN MOTOR

WATER PUMP

ELECTRONIC CARD

Page 33

Page 33

8.

With the system in Cleaning mode the water pump is the only component in operation to circulate the cleaning solution in the entire water system

9.

Let the unit remain in the cleaning mode for about 20 minutes then turn the main switch to

OFF (disconnect unit from POWER)

10. Flush out the cleaning solution from the sump reservoirs then pour onto each evaporator cavity two or three liters of clean potable water with a capfull of antibacteria solution to rinse and sanitize the mold cups and the platen.

If necessary remove the water spry bar to clean it separately as per steps 3 and 4 of paragraph B.

11. Give power to the unit by the main switch

12. During the Water Filling Phase push RESET

BUTTON for more then 2” but less then 5” the machine enter in Rinsing Mode (Fig.7)

13. Let the unit remain in the RINSING MODE mode for about 10 minutes then turn the main switch to OFF (disconnect unit from POWER)

14. Flush out the rinsing solution from the sump reservoirs

15. Place again the evaporator cover and the unit service panels.

16. Give POWER to the unit.

17. At completion of the freezing and harvest cycle make sure of proper texture and clearness of the ice cubes and that, they do not have any acid taste.

ATTENTION. in case the ice cubes are cloudy, white and have an acid taste, melt them immediatelly by pouring on them some warm water. This to prevent that somebody could use them.

18. Wipe clean and rinse the inner surfaces of the storage bin.

REMEMBER. To prevent the accumulation of undesirable bacteria it is necessary to sanitize the interior of the storage bin with an anti-algae disinfectant solution every week.

- EVAPORATOR

16

- CONDENSER

15

- AMBIENT

14

Rx Tx

L

N

13

1

2

ELECTR.

TIMER

TRANSF.

DIP

SWITCH

RELAYS

TRIAC

RELAY

5

6

11

12

7

8

9

10

3

4

WATER DRAIN VALVE

WATER IN VALVE

HOT GAS VALVE

CONTACTOR COIL

FAN MOTOR

WATER PUMP

ELECTRONIC CARD

Page 34

Page 34

Sanitation

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

19. Prepare in a plastic container the sanitation solution as per manufacturer dilution using warm water (45-50

°

C).

NOTE. Never mix the cleaning with the

sanitising solution.

20. Follow the procedures as per cleaning (from item 10 to item 13) just shorting the operation of the water pump to 10 minutes.

21. Place again the evaporator cover and the unit service panels.

22. At completion of the freezing and harvest cycle make sure of proper texture and clearness of the ice cubes and that, they do not have any acid taste.

ATTENTION. In case the ice cubes are cloudy-white and have an acid taste, melt them immediately by pouring on them some warm water. This to prevent that somebody could use them.

23. Wipe clean and rinse the inner surfaces of the storage bin.

REMEMBER.

To prevent the accumulation of undesirable bacteria it is necessary to sanitize every week the interior of the storage bin.

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