Scotsman MAR 78, MAR 128, MAR 108, MAR 208, MAR 308 Service Manual

Page 1

09014400

Scotsman Ice Srl Via Lainate, 31 - 20010 Pogliano M.se - Milano - Italy Tel. +39-02-93960.1 (Aut. Sel.)- Telefax +39-02-93550500 Direct Line to Service & Parts: Phone +39-02-93960350 - Fax +39-02-93540449 Website: www.scotsman-ice.it E-Mail: scotsman.europe@scotsman.it

ISO 9001 - Cert. n. 0080

SERVICE MANUAL

MAR 78 MAR 108 MAR 128 MAR 208 MAR 308

SPLIT

090144 00 - REV. 03/2016

Page 2

FOREWORD

SCOTSMAN MAR SPLIT UNITS are available in five basic models MAR 78, MAR 108, MAR 128, MAR 208 and MAR 308 operating by fresh water. MAR 78, MAR 128 and MAR 308 only are available, upon request, presetted to operate by sea water.

They come complete with a stainless steel cabinet, with a drive motor at V. 230/50/3 or 400/50/3-N Volt, with expansion valve, heat exchanger, float reservoir, time delay switch, bin thermostat, water pump, ice spout switch, liquid solenoid valve, water pressure control evaporator pressure ctl. valve.

The refrigerating and electrical system must be completed by the purchaser as per the instructions given in this service manual who has to provide for the complete condensing unit, its controls and refrigerant tubings.

We suggest to take time now to read this manual which contains a lot of valuable informations on the MAR Split System.

For any further queries regarding the care or operation of the machine, please contact:

ICE SYSTEMS

SCOTSMAN - EUROPE - FRIMONT SPA Via Puccini, 22 - 20010 Bettolino di Pogliano (Milano) Italy Tel. +39-02-93960.1 (Aut. Sel.)- Telefax +39-02-93550500 Direct Line to Service & Parts: Phone +39-0331-589305 - Fax +39-0331-584306 Website: www.scotsman-ice.com E-Mail: scotsman.europe@frimont.inet.it

Page 3

TABLE OF

CONTENTS

Foreword page 2 Table of contents 3 Specifications 4-9

Section I GENERAL INFORMATION

General 10 Application area 10 Condensing unit 10 Control devices 11 Location considerations 12 Refrigerant lines 12 Hydraulic circuit 12 Ice storage room 12-14 Unit layout 15

Section II INSTALLATION

Unpacking and inspection 16 Location and levelling 16 Refrigerant piping connections 16 Water piping connections 17 Water and refrigerant circuit 17 Electrical connections 18 Installation practice 19 Mar Split in multiple installation 20 Typical non-code commercial installation 20

Section III TESTING

Complete system leak test 21 Complete system evacuation 21 Complete system charging 21 Start-up & Check-out 21 Operational check-out 21-23

Section IV PRINCIPLE OF OPERATION - HOW IT WORKS

ICE maker 24 MAR Split electrical/refrigeration 25-26

Section V ADJUSTMENT & REMOVAL & REPLACEMENT

PROCEDURES

MAR Split 27-28

Section VI MAINTENANCE & CLEANING INSTRUCTIONS 29-32

Section VII SERVICE DIAGNOSIS 33-34

Section VIII WIRING DIAGRAMS 35

Page 4

SPECIFICATIONS

MAR 78 - 108 - 128 - 208 - 308

Ø 1

Ø 2

Ø 3

Ø 4

(*) "THICK ICE" SETTING - AT 10°/10°C (ambient/water temp.)

TECHNICAL SPECIFICATION

SPLIT MODEL

Basic

Electricals

Ice Production (*)

Kg/24 Hr.

Drive Motor

Finish

Shipping

Weight

Sea water Fresh W. Kcal/Hr Hp Amp

MAR 78

400/50/3 - N

230/50/3

510

3200 1/2

MAR 108

400/50/3 - N

230/50/3

670 4800 1/2

1.2

2.1

MAR 128

400/50/3 - N

230/50/3

1000 6000 1/2

1.2

2.1

MAR 208

400/50/3 - N

230/50/3

1650 8250 1/2

1.2

2.1

MAR 308

400/50/3 - N

230/50/3

2200 9700 1/2

1.2

2.1

131 131

131

223 223

**** ****

850

****

Cooling req.ts

1800

Evap.T.°C

-18

-24

-20

-30

1.2

2.1

A B C Ø1Ø2Ø3Ø4

MAR 78 621 876 520 3/4" gas 3/8" gas 3/4" gas 21 mm MAR 108 621 876 520 3/4" gas 3/8" gas 3/4" gas 21 mm MAR 128 621 876 520 3/4" gas 3/8" gas 3/4" gas 21 mm MAR 208 661 1297 520 3/4" gas 1/2" gas 28 mm 21 mm MAR 308 661 1297 520 3/4" gas 1/2" gas 28 mm 21 mm

Ø1

= GAS LINE CONNECTION (SUCTION)

Ø3

= WATER INLET FITTING

Ø2

= LIQUID LINE CONNECTION

Ø4

= WATER OUTLET CONNECTION

Page 5

MAR 78 SPLIT

Set for Fresh water Operation

ICE MAKING CAPACITY

IMPORTANT OPERATING REQUIREMENTS:

WATER LEVEL IN DRUM RESERVOIR 115-120 mm WITH WATER PUMP / SPRAY BAR

DRUM ROTATING SPEED 1.1 RPM (thick ice) CONDENSING CAPACITY 4900 Kcal/hr (TD 10 ÷ 15 °C)

HEAD PRESSURE SETTING 15 ÷ 17 Bar on air cooled units

17 Bar on water cooled unit

LOW PRESSURE SETTING 2.2 Bar on air cooled units

1.8 Bar on water cooled units

HI-PRESSURE CONTROL SETTING 34 ± 2 Bar A/C

30 ± 2 Bar W/C LO-PRESSURE CONTROL SETTING 0.2 Bar WATER PRESSURE CONTROL SETTING 0.8 Bar MAX. WATER TEMPERATURE 35 °C MIN. WATER TEMPERATURE 5 °C MIN. WATER PRESSURE 1 atm. MAX. WATER PRESSURE 5 atm. MIN. AMBIENT TEMPERATURE 5 °C MAX. AMBIENT TEMPERATURE 40 °C MAX. VOLTAGE VARIATION ± 10%

NOTE. The production diagrams herebelow represented can be used as reference, since the data indicated have been obtained with a air/water cooled condensing unit equipped with a hermetic compressor type U.H. TFH 2480Z providing - 3200 Kcal/hr at -18 °C Refrigerating capacity.

520

500

480

460

440

420

400

380

360

340

Kg./24 h

°C

32 27

°C

AIR COOLED MODELS

WA TER TEMPERATURE

AMBIENT TEMPERATURE

ICE PRODUCED PER 24 HRS.

Thicker scale ice

Page 6

MAR 108 SPLIT

Set for Fresh water Operation

ICE MAKING CAPACITY

IMPORTANT OPERATING REQUIREMENTS:

WATER LEVEL IN DRUM RESERVOIR 115-120 mm WITH WATER PUMP / SPRAY BAR

DRUM ROTATING SPEED 1.5 RPM (thick ice)

2.3 RPM (thin ice) CONDENSING CAPACITY 7500 Kcal/hr (TD 10 ÷ 15 °C) HEAD PRESSURE SETTING 15 Bar on air cooled units

15 Bar on water cooled unit LOW PRESSURE SETTING 1.6 Bar on air cooled units HI-PRESSURE CONTROL SETTING 36 Bar LO-PRESSURE CONTROL SETTING 0.2 Bar WATER PRESSURE CONTROL SETTING 0.8 Bar MAX. WATER TEMPERATURE 35 °C MIN. WATER TEMPERATURE 5 °C MIN. WATER PRESSURE 1 atm. MAX. WATER PRESSURE 5 atm. MIN. AMBIENT TEMPERATURE 5 °C MAX. AMBIENT TEMPERATURE 40 °C MAX. VOLTAGE VARIATION ± 10%

NOTE. The production diagrams herebelow represented can be used as reference, since the data indicated have been obtained with a air/water cooled condensing unit equipped with a hermetic compressor type U.H. TAG 2516Z providing - 4800 Kcal/hr at -24 °C Refrigerating capacity.

750

700

650

600

550

500

450

Kg./24 h

°C

32 27

°C

AIR COOLED MODELS

WA TER TEMPERATURE

AMBIENT TEMPERATURE

ICE PRODUCED PER 24 HRS.

Thicker scale ice

Page 7

MAR 128 SPLIT

Set for Fresh water Operation

ICE MAKING CAPACITY

NOTE. The production diagrams herebelow represented can be used as reference, since the data

indicated have been obtained with a air/water cooled condensing unit equipped with a hermetic compressor type U.H. TAG 2522Z providing - 6000 Kcal/hr at -24°C Refrigerating capacity.

IMPORTANT OPERATING REQUIREMENTS:

WATER LEVEL IN DRUM RESERVOIR 115-120 mm WITH WATER PUMP / SPRAY BAR

DRUM ROTATING SPEED 2.4 RPM (thick ice) CONDENSING CAPACITY 9750 Kcal/hr (TD 10 ÷ 15 °C) HEAD PRESSURE SETTING 14 ÷ 16 Bar on air cooled units LOW PRESSURE SETTING 1.6 Bar on air cooled units HI-PRESSURE CONTROL SETTING 36 Bar LO-PRESSURE CONTROL SETTING 0.2 Bar WATER PRESSURE CONTROL SETTING 0.8 Bar MAX. WATER TEMPERATURE 35 °C MIN. WATER TEMPERATURE 5 °C MIN. WATER PRESSURE 1 atm. MAX. WATER PRESSURE 5 atm. MIN. AMBIENT TEMPERATURE 5 °C MAX. AMBIENT TEMPERATURE 40 °C MAX. VOLTAGE VARIATION ± 10%

1000

950

900

850

800

750

700

650

600

°C

32 27

AIR COOLED UNITS

WA TER TEMPERATURE

AMBIENT TEMPERATURE

ICE PRODUCED PER 24 HRS.

10 5

Thicker scale ice

Page 8

MAR 208 SPLIT

Set for Fresh water Operation

ICE MAKING CAPACITY

NOTE. The production diagrams herebelow represented can be used as reference, since the data

indicated have been obtained with a air/water cooled condensing unit equipped with a hermetic compressor type DORIN K500 CS providing - 8250 Kcal/hr at -20 °C Refrigerating capacity.

IMPORTANT OPERATING REQUIREMENTS:

WATER LEVEL IN DRUM RESERVOIR 90-95 mm WITH WATER PUMP / SPRAY BAR

DRUM ROTATING SPEED 1.05 RPM (thick ice)

1.60 RPM (thin ice) CONDENSING CAPACITY 11000 Kcal/hr (TD 10 ÷ 15 °C) HEAD PRESSURE SETTING 16 ÷ 18 Bar on air cooled units

16 ÷ 17 Bar on water cooled unit LOW PRESSURE SETTING 1.9 Bar HI-PRESSURE CONTROL SETTING 36 Bar LO-PRESSURE CONTROL SETTING 0.2 Bar WATER PRESSURE CONTROL SETTING 0.8 Bar MAX. WATER TEMPERATURE 35 °C MIN. WATER TEMPERATURE 5 °C MIN. WATER PRESSURE 1 atm. MAX. WATER PRESSURE 5 atm. MIN. AMBIENT TEMPERATURE 5 °C MAX. AMBIENT TEMPERATURE 40 °C MAX. VOLTAGE VARIATION ± 10%

1700

1600

1500

1400

1300

1200

1100

Kg.

°C

32 27

°C

32 38

AIR COOLED UNITS

WA TER TEMPERATURE

AMBIENT TEMPERATURE

ICE PRODUCED PER 24 HRS.

WATER COOLED UNITS

10 5

10 21

1900

1800

1700

1600

1500

1400

1300

Kg.

°C

32 27

°C

DE 10 A' 38

WA TER TEMPERATURE

AMBIENT TEMPERATURE

ICE PRODUCED PER 24 HRS.

10 5

Thicker scale ice

Thiner scale ice

Page 9

MAR 308 SPLIT

Set for Fresh water Operation

ICE MAKING CAPACITY

NOTE. The production diagrams herebelow represented can be used as reference, since the data

indicated have been obtained with a air/water cooled condensing unit equipped with a semihermetic compressor type DORIN K1000 CS providing - 9700 Kcal/hr at -30 °C Refrigerating capacity.

IMPORTANT OPERATING REQUIREMENTS:

WATER LEVEL IN DRUM RESERVOIR 90 mm WITH WATER PUMP / SPRAY BAR

DRUM ROTATING SPEED 1.6 RPM (thick ice - air cooled)

1.8 RPM (thick ice - water cooled)

2.9 RPM (thin ice) CONDENSING CAPACITY 16200 Kcal/hr (TD 10 ÷ 15 °C) HEAD PRESSURE SETTING 15 Bar on air cooled units

14 Bar on water cooled unit

LOW PRESSURE SETTING 1 Bar on air cooled units

0.75 Bar on water cooled unit HI-PRESSURE CONTROL SETTING 34 ± 2 A/C Bar

30 ± 2 W/C Bar LO-PRESSURE CONTROL SETTING 0.2 Bar WATER PRESSURE CONTROL SETTING 0.8 Bar MAX. WATER TEMPERATURE 35 °C MIN. WATER TEMPERATURE 5 °C MIN. WATER PRESSURE 1 atm. MAX. WATER PRESSURE 5 atm. MIN. AMBIENT TEMPERATURE 5 °C MAX. AMBIENT TEMPERATURE 40 °C MAX. VOLTAGE VARIATION ± 10%

2600

2400

2200

2000

1800

1600

1400

Kg.

°C

32 27

°C

AIR COOLED UNITS

WA TER TEMPERATURE

AMBIENT TEMPERATURE

ICE PRODUCED PER 24 HRS.

32 38

WATER COOLED UNITS

10 5

10 21

2800

2600

2400

2200

2000

1800

1600

Kg.

°C

32 27

°C

DE 10 A' 38

WA TER TEMPERATURE

AMBIENT TEMPERATURE

ICE PRODUCED PER 24 HRS.

10 5

10 21

Thicker scale ice

Thiner scale ice

Page 10

SECTION I

GENERAL INFORMATION

GENERAL

The MAR SPLIT UNITS are pratically the "Evaporating Unit Section" complete with driving mechanism and control devices, all encased in their stainless steel cabinets, for making complete scale-ice maker system The MAR SPLIT UNITS must be remotely connected to a corresponding size "Condensing Unit" to become a MAR scale-ice maker plant, it is therefore of primary importance first, the selection of the right type and size of all the components to be used to complete the refrigerant system and secondly - but not least - the skillness of the refrigeration engineers that will proceed in completing the system by making the refrigerant, hydraulic and electrical connections.

APPLICATION AREA

The scale-ice maker system using the MAR Split Units, applies to different sort of market situations where scale-ice is needed. Most specific areas are:

a) Fishing Vessels b) Fish Markets and Fish Processing Plants c) Supermarkets d) Meat packaging plants Basically they can go in any place where there is

a limited space situation or where the condensing unit (compressor/condenser) must be located in a room where noise and heat is not objectionable. MAR Split can be set to produce "THICK ICE" generally used in the fishing industry or "THIN ICE" generally used in the meat processing industry. Standard versions are set for "THICK ICE" production (about 2 mm thickness) and for fresh water operation. Different conditions should be specified when ordering the Units. Modular combinations are possible to increase output ice production.

COMPLETE SYSTEM INSTALLATION - How it is made

The complete scale-ice making system can be divided in three major groups, that are:

a) the compressor and condenser unit with their

own components with their own refrigerant and water lines fittings and electric wires terminal block.

b) the evaporator drum unit (MAR Split Unit

supplied by Frimont) complete with drive mechanism, drive motor, refrigerant and water lines fittings, refrigerants expansion valve and electric wire junction box.

c) console panel and control box with compressor

ON/OFF switch, relay, timer, warning lights, pressure gauges and electrical wire terminal block.

For installation on board of fishing vessels where the electrical power available is not sufficient or adequate to run the compressor, a mechanical or hydraulic drive transmission must be used. These drive systems will not be covered in details in this manual as it is assumed that their fundamentals have been already mastered to the installator engineer by more specific publications.

CONDENSING UNIT

The compressor is truly the heart of the system, when it becomes inoperative refrigeration immediately ceases. Therefore the selection of proper type and size of compressor together with the proper type and size of condenser, their components and controls, deserve the most of attention by the refrigeration engineer. For our MAR ice making system, the compressor to take is consideration are ot two basic types:

a) the accessible Semi-Hermetic-Motor-

Compressor for installation on sites where the electrical power supply is available in adequate quantity and quality.

b) the Open Type Compressor for automative

installations (Fishing Vessels) with mechanical pneumatic or hydraulic drive system through a magnetic clutch.

Whatever is the type of compressor being used, it is recommended, for its selection, to observe the refrigerant capacity on the following table:

MAR 78 3200 Kcal/h -18°C Evap. Temp. MAR 108 4800 Kcal/h -24°C Evap. Temp. MAR 128 6000 Kcal/h -24°C Evap. Temp. MAR 208 8250 Kcal/h -20°C Evap. Temp. MAR 308 9700 Kcal/h -30°C Evap. Temp.

Page 11

The approximate heat transfer capacity for the

condenser selection is shown on the herebelow

table

The condenser is basically a heat exchanger where the heat absorded by the refrigerant during the evaporating process is given to the condensing medium which could be the air or the water.

When using marine type condenser a marine type, water regulating valve is requested as well to modulate the cooling water flow within condenser.

Recommendend valve is the pressure actuated "PENN".

The Liquid receiver is a storage tank for liquid refrigerant that can be useful on refrigeration split installation to make the quantity of refrigerant in the system less critical.

It is normally provided with two service valves and occasionally can be built-in the bottom of condenser. It is a common component used in refrigeration plant and should be large enough to hold all the refrigerant in the system.

The Oil separator should be filled with oil during installation until the float valve just begins to open. This oil quantity always remains in the separator and would otherwise be taken from the compressor.

It is well known that when the compressor operates, small amount of oil is pumped out along with the hot compressed vapor and to prevent it from going any further in the system, the oil separator traps it to return, upon opening of its float valve, to the crankcase of the compressor.

CONTROL DEVICES

The scale-ice maker system must be completed with all the necessary safety devices and controls in order to fully protect it and to minimize operational checks and functions, however any

excess in using automatic controls and protections may complicate the situation at the point that some of the controls be eliminated later, by the user. In order to help the installator engineer to decide with which controls he has to equip a given system, we cover all the necessary ones mentioning for each of them the positive factors and eventually the negative ones.

High Pressure Control

Very important - No negative factors Set to values shown on techn. spech. Not supplied.

Water Pressure Control

Very important - No negative factors Set to 0.8 atm-cut-in - 0.5 atm cut-out. Supplied.

Lo Pressure Control

Very important because in case of refrigerant leaks at the evaporator, it prevents to draw in the system some water from the drum reservoir. It also prevents to draw air through the compressor crank-shaft seal. This may occure during vacuum operations of the system. However, it may inopportunely trip-off at the system start-up and if suction operating pressure, on account of the excessive rotating speed of compressor or excessive compressor capacity, is very close and gets below its setting value, which is 0.2 atm. Not supplied.

MAR 78 MAR 108 MAR 128 MAR 208 MAR 308

300 lt/hr 450 lt/hr 84*****h 1200 lt/hr 1600 lt/hr

Particular care must be deserved to the selection of the water cooled condenser expecially the marine type for fishing vessels installation.

They can be marine type (cupro-nickel) tube

within a tube condenser with plasticized heads.

With water inlet temperature of +20°C and outlet of +30°C at condensing temperature of 32°C the water consumption should be:

MAR 78 MAR 108 MAR 128 MAR 208 MAR 308

4900 Kcal/h 7500 Kcal/h 9750 Kcal/h 11000 Kcal/h 16200 Kcal/h

Page 12

LOCATION CONSIDERATION

WARNING - The MAR SCALE ICE MAKERS are not designed for outdoors installations where air temperature falls below 5°C (40°F) and may exceed 40°C (100°F)

Operating a machine with an unacceptable configuration will void the refrigeration system warranty.

For installation on board of fishing vessels, the location for the condensing unit is generally the engine room, while the evaporator unit can be permanently placed in some area of the deckhouse or if it is not too cold (not below 5°C), inside the fish and ice hold. In case a stand is going to be made and used plan for adequately fastening the MAR SPLIT UNIT. The stand must be steady made to do not cause excessive vibrations and must have the possibility to be securely fastened to the wall or to the floor. In relation to evaporator position and situation a certain kind of ice chute is required. Make sure to have it available for the start-up of the system.

REFRIGERANT LINES

Inner diameter of refrigerant lines going from condensing unit to evaporator unit and back, must be of adequate size in relation to tubing lenght. The table below show the recommended sizes of refrigerant lines:

MODELL Lenght of tubes Suction line Liquid line

MAR 78 5 to 15 mt 18 mm 12 mm MAR 108 5 to 15 mt 18 mm 12 mm MAR 128 5 to 15 mt 18 mm 12 mm MAR 208 5 to 15 mt 28 mm 12 mm MAR 308 5 to 15 mt 42 mm 12 mm

2. Insulate lines that will be exposed to outside temperature that will be below freezing for extended period of time.

3. Follow straight line routing, when possible, however give to the suction line a certain pitch (2 cm per meter). On liquid line be sure to do not have restrictions. Bends and fittings should be the minimum necessary as they can increase the resistance to the fluid flow.

4. To prevent any condensing unit vibration travelling into the lines, vibration absirbers may be installed in the suction and the liquid lines near the condensing unit. Because the appearence of an installation is important, the piping should be put-in as neathly as possible. For best sound absorb-tion, it is best to put-in two absorbers in each line, one vertically and one horizontally.

For evacuation and charging operations two service valves must be provided. One on the liquid line and one on the suction line.

5. A drier and a sight glass should be installed in the liquid line at the condensing unit.

HYDRAULIC CIRCUIT

Another item that requires a preliminarly attenzion for the MAR SPLIT installation is the water supply to the ice making section and to the condensing unit case a water cooled condenser is being used. Separate water linea are recommended with hand shut-off valve and water filter on individual line.

Remember: – Maximum Water Temperature 35°C

– Minimum Water Temperature 5°C – Minimum Water Pressure 1 atm – Maximum Water Pressure 5 atm

The Ice Making Section (MAR SPLIT UNIT) generally requires:

– 21 lt/hr MAR 78 – 29 lt/hr MAR 108 – 42 lt/hr MAR 128 – 70 lt/hr MAR 208 – 91 lt/hr MAR 308

of constant water supply. The water consumption of the water cooled

condenser (in case of water cooled condensing unit) to be taken on account, with water inlet temperature at 15°C is:

– 300 lt/hr MAR 78 – 480 lt/hr MAR 108 – 1200 lt/hr MAR 128 – 1500 lt/hr MAR 208 – 1600 lt/hr MAR 308

For installation on fishing vessels, using seawater, to carry sea water from sea chest to the condensing unit and to evaporating unit through appropriate strainers, you may use aluminium brass pipes or PHE plastic pipes to avoid corrosion problems.

Never use copper tubes.

ICE STORAGE ROOM

Ice storage situations are of two kinds: a) Short terms storage

b) Extended terms storage Being, as stated scale ice made by MAR

machines flat, dry and subcooled, therefore with the tendency to stick toghether, particular attention is required for proper ice storage conditions for better ice handling. An insulated ice storage bin or room is always required, then

according to ice end use application, this can be refrigerated or non-refrigerated.

Page 13

Also a weight volume ratio of 2.1 cm. mt. per ton, must be taken into consideration for correct ice storage.

a) Non-refrigerated room for short term

storage

The scale ice is produced continuously for 24 Hours per day, whereas the use period is generally for no longer than 8 hours per day. Therefore storage facilities should be provided to accomodate a minimum of 16 hours of production, this means that every MAR ice machine must be installed with a properly insulated storage room which should have a minimum capacity of 2/3 the daily ice production. With a well insulated room and duly subcooled scale ice, the limited losses of heat through the walls of a properly designed room with adequate arrangements, are largely offset, and excess melting will not occur. In most situations where whole quantity of ice produced

is being used on a daily basis, it is not necessary to provide cooling for the ice storage room.

b) Refrigerated room for extended storage

and long distance conveying

When scale ice is to be transported at a considerable distance, such as aboard fishing vessels, or in locations with normal ambient temperatures conditions, or when used in industrial plants where demand is intermittent, its subcooling power must be preserved absolutely in the storage bin by a proper cooling system keeping air temperature at a pre-established and constant value. The ideal ice storage room is the type with mechanically refrigerated jacket space surrounding the ice bin. Good practice calls for an ice storage capacity of about two times the daily ice machines production with an inside temperature of -6°C minimum (20°F).

Page 14

NON REFRIGERATED ICE STORAGE ROOM

1 Condensing unit 2 Liquid line 3 Evaporator drum unit 4 Suction line 5 Power supply line 6 Hand disconnect switch 7 Water supply line 8 Hand shut-off valve 9 Water filter 10 Condenser water inlet 11 Condenser water outlet 12 Evaporator water supply 13 Water drain line 14 Liquid line service valve 15 Suction line service valve

REFRIGERATED ICE STORAGE ROOM

(Jacket system)

14 Refrigerant coil 15 Insulated panel 16 Air gap 17 Ice bulkhead

Page 15

MAR 78-108-128 MAR 208-308

mm (inch) mm (inch)

A 621 (24.45) 661 (26.02) B 876 (34.48) 1296 (51.03) C 520 (20.38) 520 (20.38) D 813 (32) 853 (33.58) E 231 (9.09) 440 (17.32) F 3/4" GAS 28 mm G 3/8" GAS 1/2"

UNIT LAYOUT AND OVERALL DIMENSIONS

Page 16

SECTION II

INSTALLATION

MAR SPLIT UNIT - UNPACKING AND INSPECTION

1. Visually inspect the exterior of the shipping container and skid and any severe demage noted should be reported to the delivery carrier; and a concealed damage claim filled subject to internal inspection with carrier representative present.

2. Remove the packing and remove the side panels to unloose the shipping bolts securing the unit to the skid.

3. Remove screw and all panels from cabinet and inspect for any concealed damage. Notify carrier of any concealed damage claims as stated in step 1 above.

4. Remove all internal packing from unit compartment.

5. Check that refrigerant lines do not rub or touch lines or surfaces and that all wires are securely fastened to their terminals.

6. Use clean damp cloth or disposable paper wiper to wipe clean the exterior surface of the cabinet.

7. See DATA PLATE on the cabinet base and check that the location source voltage corresponds with the voltage specified on the dataplate.

CAUTION - Unproper voltage supplied to the icemaker will void your parts replacement programm.

MAR SPLIT UNIT - LOCATION AND LEVELLING

1. Position the MAR SPLIT UNIT in the selected permanent location which could be on top of ice storage cabinets, on the side of cold storage room supported by special pre-set stands or, in case of fishing vessel installation, inside or on top of the fish hold.

2. After having placed the unit on the support stand, level the cabinet on both the left to righ and front to rear directions, by inserting between the unit base and a support stand few rubber pads. Fit in unit base holes in the cabinet, appropriate bolts to fasten unit to stand. Make sure to leave enough space around the unit to allow access to internal components for inspection and servicing and also for the fitting of the ice chute if needed.

3. Proceed to position the condensing unit in its location and to mount it firmly to avoid a sudden shift that would endager the refrigerant lines. Precautions to be observed vary with the kind of situation in which the unit is to be placed. The area should be well ventilated to permit escape of refrigerants in case unit develops a leak.

MAR SPLIT UNIT - REFRIGERANT PIPING CONNECTION

Fitting sizes:

Liquid Line Suction Line

MAR 78-108-128 3/8" Gas 3/4" Gas MAR 208 1/2" Gas Ø 28 mm MAR 308 1/2" Gas Ø 42 mm

Take extreme care to keep refrigeration tubing clean and dry prior to installation. Following procedure should be followed:

a) Do not leave dehydrated compressor or filter-

drier open to the atmosphere any longer than it is absolutely necessary. (One or two minutes maximum suggested).

b) Use only refrigeration grade copper-tubing,

properly sealed against contamination.

c) Permanent suction lines filters and liquid line

filter-driers are recommended in all filled installed system.

d) When brazing refrigerant lines, an inert gas

should be passed through the line at low pressure to prevent scaling and oxidation inside the tubing. Dry nitrogen is preferred.

e) Line connection to vibration eliminators be

made with silver solder alloy.

Arrange that refrigerant lines run along the walls and cellings and be supported at intervals frequent enough to keep tubing atraight and firmly in place. In all cases the tubing should be run horizontally and vertically with neat looking bends of as perfect radius as possible. The liquid line presents no difficulties as to its sland and position, but you must install the suction line so the tubing will drain toward the compressor. During preparation of liquid line take the necessary measure to install after evacuation of system, the filter-drier of suitable size for constant operation. You may as well consider to install on suction line a suction tube filter, specially if the required cleaness cannot be guaranteed. After all lines are connected, the entire system must be leak tested. The complete system should be pressurized to no-more than 12-13 atm. with refrigerant and dry nitrogen or dry CO2 for being leak tested by means of an electronic type leak detector.

Page 17

For pressurizing, evacuating and charging the system, two service valves are necessary; one should be in the Suction Line at the inlet side of suction filter and one should be in the Liquid Line at the outlet side of filter dryer. The two Service Valves, if properly capped can be left permanently in the system. Connection should be 3/8" or 1/2" size.

MAR SPLIT UNIT - WATER PIPING CONNECTIONS (PLUMBINGS)

MAR SPLIT UNIT is supplied with float valve in position to maintain the water level in drum reservoir at the height required for fresh water operation or if required, for sea water operation.

Water inlet line must go directly to float valve line fitting of 3/4" gas, (copper tube is not recommended for sea water supply) also make sure to fit on this same a hand shut-off valve close enough to MAR unit and a proper kind and size of filter strainer. Incoming water geoes through the float reservoir first and then to drum basin. Outlet water line should be shaped adequately to drain by gravity any water passing through it. Water outlet fitting from float reservoir requires a 20 m/m I.D. water hose. All plumbing connections should be made in accordance with local plumbing codes.

WATER AND REFRIGERANT CIRCUIT - SPLIT UNITS

1. Liquid line

2. Heat exchanger

3. Automatic expansion valve

4. Suction line

5. Water inlet

6. Float valve

7. Water basin

8. Evaporation drum

9. Scraping blade

10. Water pump

11. Spray bar

12. Water tube - Pump / spray bar

13. Liquid line valve

Page 18

MAR SPLIT UNIT - ELECTRICAL CONNECTION

The supply power, voltage frequency and phase must coincide with unit nameplate. MAR Split units are internally wired and ready for field wiring connections which must be made in accordance with any local codes that may apply. Wires should be of adequate size to handle the connected load, individually fused (see specifications at page 5) and provided with ground line. The maximum allowable voltage variation, should not exceed ten percent of the nameplate rating, even under starting conditions. Low voltages can cause erratic operation and may be responsible for serious damages to the overload switch and motor windings. Make the necessary steps so that the MAR Split

Unit be electrically connected to the condensing unit control box contactor as illustrated on the following wiring diagrams representing three different electric supply line situation which are respectively. 230/50/3 or 400/50/3-N.

WARNING - Correct Drum rotation - The evaporator drum drive motor being a threephase motor wired for 380 V. It is of estreme importance to check immediately upon unit start-up that motor rotates CLOCKWISE in order that gear motor pulley rotates in the direction of the ARROW on it indicated. Should the motor turn counterclockwise, it is necessary to instantly switch-off the unit and interchange one polarity at terminal block connection at main electric cord.

Page 19

INSTALLATION PRACTICE SPLIT UNIT ASHORE

INSTALLATION PRACTICE SPLIT UNIT ON OFFSHORE FISHING VESSEL

1 Deck house 2 Control panel & main switch 3 Ice chute 4 Evaporator drum unit 5 Ice hold 6 Fishing room 7 Réfrigérant lines 8 Condensing unit 9 Engine room

Page 20

MAR SPLIT IN MULTIPLE INSTALLATION

In multiple installation various types of commercial refrigerating equipment are connected to the same condensing unit, which is normally located in the machine room, as often occurs in supermarkets. MAR SPLIT can be one of the refrigerant units connected to a multiple use condensing unit. In this kind of installation it will be best to replace the standard AEV refrigerant control with a corresponding size AMXV control, which, in relation to the multiple installation situations (great evaporating temperature difference) could be of two temperature type. Also a manifold with hand shut-off valves on both liquid and suction line is recommended for these installations. In many multiple installations check valves are put in the suction line of the coldest evaporator to prevent that warmer higher pressure low-side vapor moves into colder evaporator during the off periods. Also a pressure control valve is installed on

MAR SPLIT suction line to maintain constant pressure on evaporator drum. Therefore, for the MAR SPLIT multiple installation you may need:

1. Automatic Expansion valve The automatic expansion valve is the leading multiple evaporator system refrigerant control as it does not regulate the low side pressure, but, rather control the filling of the evaporator with refrigerant, it is important to use a valve for the correct capacity.

2. Solenoid valve Two-ways type to be connected in series with any MAR SPLIT protecting and starting device.

3. Pressure Control valve On the MAR SPLIT suction line. It will mantain constant pressure on MAR SPLIT evaporator drum.

4. Manifold with hand shut-off valve One to be placed on the liquid line and the other on suction line to isolate MAR SPLIT unit when necessary.

Installation of MAR SPLIT in multiple system should be done in the following order.

1. Put MAR SPLIT unit in place. See Sec. II Location & Levelling.

2. Install valves and controls.

3. Install tubings. See Sec. II Refrigerant piping connections.

4. Make water piping connections. See Sec. II Plumbing.

5. Make electrical connections See Sec. II Electrical connections.

6. Check for leaks. See Sec. II Leak Test.

7. Dehydrate installation. See Sec. III Evacuation / Charging.

8. Start unit. See Sec. III Operazional Check-out.

TYPICAL NON-CODE COMMERCIAL INSTALLATION

1. Power line

2. Main switch

3. Relay / Starter

4. Suction line shutoff valves

5. Liquid line shutoff valves

MAR SPLIT ICE MAKER

DISPLAY CASE

MEET ROOM

CONDENSING UNIT

Page 21

SECTION III

TESTING

COMPLETE SYSTEM LEAK TESTS

During pressure testing for leaks, keep the compressor suction service valve and discharge service valve closed to prevent air and moisture from entering the compressor. All other valves in the system must be open. Sufficient liquid refrigerant shall be charged into the system to raise the pressure to 2.5 atm. and dry nitrogen added to obtain the desired test pressure (20.5 atm is sufficient). Leak testing shall be performed with an electronic leak detector, unless the use of a halide torch is specifically authorized by the owner. Refrigeration piping will not be acceptable unless it is gas tight. If any leaks are found, isolate the defective area, discharge the gas and repair the leaks and then repeat the test. When testing has been completed release all pressure freely to atmosphere.

COMPLETE SYSTEM EVACUATION

The system shall be evacuated with a vacuum pump specifically manufactured for vacuum duty, having a capacity of pulling a vacuum of 50 microns or less. Evacuation of the system must never be done by the use of the refrigerant compressor. The pump should be connected to both the low and high side evacuation valves with vacuum hoses. The compressor service valves should remain closed. A high vacuum gauge capable of registering pressure in microns should be attached to the system pressure readings. Never put the compressor in operation. To check system pressure, a hand valve must be provided between the pressure gauge and the vacuum pump which can be closed to isolate the system and check the pressure. Evacuate the system to an absolute pressure not exceeding 1,500 microns. Creak the vacuum to excess pressure of 0,15 atm (1 psig) with the refrigerant to be used in the system. Repeat the evacuation process again breaking the vacuum with refrigerant. Install a definitive drier of the required size in the liquid, open the compressor suction and discharge valves and evacuate to an absolute pressure not exceeding 500 microns. Leave the vacuum pump running for not less than two hours without interruption. Raise the system pressure to 0,15 atm (1 psig) with refrigerant and remove the vacuum pump.

COMPLETE SYSTEM - CHARGING

Refrigerant shall be charged directly from original drums through a combination filter drier. Charge the system by means of a charging fitting in the liquid line.

Wheigh the refrigerant drum before charging so that an accurate record can be kept of the weight of refrigerant put in the system. It refrigerant is added to the system through the suction side on the compressor, charge in vapor form only. The process used most often to determine correct refrigerant charge is to observe the refrigerant flow in the sight glass in the liquid line. As steady supply of liquid is necessary for proper functioning of expansion valves; it can be assumed that the system has been correctly charged when a clear flow of liquid refrigerant is visible. Bubbles or foam usually indicate insufficient refrigerant, even if there could be other reason for the bubbles or foam to appear in the sight glass. So, the practice to relay on the sight glass only to determine whether the systems is correctly charged is certainly good but not fully positive. After the final leak test, refrigerant lines exposed high ambient conditions should be insulated to reduce heat pick-up and prevent the formation of flash gas in the liquid lines. Suction line should be insulated if exposed, to prevent condensation.

START-UP - CHECK-OUT

Compressor and condensing unit will normally be delivered to the job with sufficient oil for average installation. Check compressor for proper oil level and, if necessary, add sufficient oil to bring the level to the center of the cranckase sight glass. Use only refrigeration oil recommended by the compressor manufacturer. Remove or loosen shipping retainers under motor-compressor. Make sure hold down nuts on spring mounted compressor are not touching the compressor feet. Check electrical connections. Be sure they are all tight. Check high and low pressure control, water valves, pressure regulating valves, safety controls and adjust if necessary.

OPERATION CHECK-OUT

After system has been charged and checked-out make sure to correctly position, attached to the unit ice spout, the require chute (not supplied).

Perform a through re-check of entire system as per following steps.

1. Make sure to open the water supply line shutoff valve and that water flows freely from float valve into float reservoir and from this to the drum basin.

Page 22

2. Provide power to the unit.

3. Observe the water filling operations. a) Water flows into the float reservoir first. b) Water is filling the freezing drum basin. c) Float moves up as water level rises in water

reservoir.

d) Float stops water flow when water reaches

suitable operation level. Now, water surrounds bottom half of freezing drum.

4. Move the manual ON-OFF toggle of main disconnect switch to ON position. The green light on console panel will glow.

5. MAR uses an electrical "three phases monitoring relay" which alerts installer in case of wrong wiring by keeping green LED ON only. In this case change phase connection wiring.

6. Correct wiring is shown by both LEDs Green and Orange steady ON together.

7. Observe immediately that evaporator drum rotates in the right direction, namely toward the scraping blade.

8. Meanwhile unit is under power KT1 relay compressor device is energized as well in

order to delay compressor start up by 18' (KT1 orange LED blinks during this delay). On normal operation - compressor ON - KT1 LEDs (orange and green) are steady ON together.

NOTE. In case on any temporally Ice maker trip OFF (not alarm) due to NO/LOW water pressure, bin full, ice spout switch activation

unit stops by only keeping drive motor operating

for 18' in order to clear evaporator by ice. KT2 delay relay LEDs steady ON (orange and green) during this delay.

WARNING - Drum drive motor is three phases type. At unit start up, correct wiring is assured by 3 phases monitoring relay at power in. In addition proper drum rotation speed is monitored by a Hall Effect sensor. In case the drum is not rotating at all or it rotates too slow (less then 1/4 turn every 30 seconds) a special Electronic Control trips the unit OFF so to avoid that compressor can operate with the drum OFF (in case of fiber keys, drive motor or gear reducer breakage). In case of any field drive motor replacement, care must be taken to its wiring, checking the correct evaporator drum rotation that must be toward ice blade. In case of wrong evaporator drum rotation, turn the unit OFF and exchange two phases connection at drive motor control box.

Page 23

9. Check compressor head and suction

pressure. If not within system design limits, determine why and take corrective action.

10. For water cooled condensing unit check the

water flowing out of the condenser to see if it drains properly.

11. Observe if ice skin tends to cover entire drum

surface and is being scraped-off correctly by the blade.

12. Check liquid line sight glass and expansion

valve operation. If there are indications that more refrigerant is required leak test all connections before adding refrigerant.

13. Observe oil level in compressor crankcase

sight glass and add oil as necessary to bring level to center of the sight glass.

Indicative Operating Pressure - With Fresh Water Supply - Water Cooled System

MAR 78 MAR 108 MAR 128 MAR 208 MAR 308

Head Pressure (bar) 17 15 16 16 14 Suction 1.8 1.6 1.6 1.9 0.75 Drum R.P.M. (thick ice) 1.1 1.5 2.4 1.05 1.8

Indicative Operating Pressure - With Sea Water Supply - Water Cooled System

MAR 121 MAR 301

Head Pressure (bar) Suction Drum R.P.M. (thick ice) 1.52 1.82

14. Let the system operate for at least two hours, then check one by one the operation of each individual control and protective device for proper setting.

15. Eliminate any excessive vibration or noise and pulleys misalignement.

16. Observe that evaporator drum is frosted all over from end to end. If this is not the case setting of refrigerant expansion valve may be necessary. For proper adjustement of this valve turn the valve setting stem of one eight of a turn counter-clockwise to allow more refrigerant to flow until the evaporator drum surface is evenly frosted from end to end. In case there is an excessive frost back on the suction line and frost start to form on compressor suction service valve, slightly turn clockwise the expansion valve setting stem until the frost back on the compressor service valve melts over.

17. Observe that ice slides through spout opening with no difficulties. Clearence between the blade and drum surface must be 0,10 mm. Transparent plastic chute must be flat.

18. When the system is performing satisfactorily go over with the owner/user to all significant specifications, the start-up and operations. Answer alla questions about the care and attention to give to the ice making system.

Page 24

SECTION IV

PRINCIPLES OF OPERATIONS - HOW IT WORKS

1. ICE MAKER

The revolving drum which may be of two different sizes depending on the ice maker capacity, is basically made of a cylinder skeleton covered by a stainless steel jacket. There is a channel, about 15 m/m deep and 15 m/m wide on the surface of the cylinder skeleton which, in a spiral pattern, goes from one end to the other of cylinder. Both the ends of the channel communicate with a bore made in the left cylinder journal. The head manifold on the left side is for either liquid refrigerant inlet and vapor refrigerant outlet. When a cylinder stainless steel jacket is forced and sealed on the drum, the spiral pattern channel made for the refrigerant flow becomes virtually the evaporator serpentine. The metered refrigerant that reaches the evaporator serpentine by passing throught the head manifold in the left side cylinder journal, boils and evaporatores as it comes into contact with the drum metal jacket. About one third of the cylinder drum is constantly submerged in water this will allow the cylinder metal jacket to draw a film of water that, as soon as it comes afloat, freezes almost instantly due to the heat absorption created by the boiling refrigerant circulating in the inner serpentine and scrubbing with the jacket inner surface.

2. PRINCIPLES OF OPERATION - HOW IT WORKS

On fresh water installation a combination of water pump and water distributor tube provides a constant flow of cold water to the upper side of the evaporator drum so to have an extended metal jacket surface covered by water and a thicker ice layer. Then the ice layer of the emerged cylinder sector has a fraction of time to solidify, dry and eventually subcool before contacting the edge of the horizontal scraping blade. The scraping blade, of heavy duty metal, cause the peel off of the ice sheet formed on the drum jacket by racking it while it advances on the revolving drum. The ice sheet is so dry that, when it gets in contact with the scraping blade, it cracks in a form of irregular shaped chips. The refrigerant leaves the evaporator serpentine to return to the compressor via suction line through the inner bore of the left side cylinder journal. The refrigerant sealing in inlet/outlet head manifold is assured by specially designed sealing device, the cylinder is driven by separate drive motor and gear reducer located on the right basin frame. The gear reducer, the driving belt with its pulley, the revolving drum with the rotating part of the sealing devices and the water pump on fresh water installation are the mechanical parts in motion.

1. Water drawing area

2. Water sprayed freezing cooling area

3. Sub-cooling area

4. Float valve

5. Water feeding line

6. Scraping blade

7. Water pump

8. Water basin

9. Revolving drum

10. Water distributor tube

Page 25

3. MAR SPLIT - ELECTRICAL / REFRIGERATION

The electrical circuit consists of drive motor, water pump, water pressure switch, spout switch and time delay safety device.

A. Drive motor

The evaporator drum drive motor is a three phase motor of 1/2 HP wired for 380/220 Volts 50/60 Hz - 1,2/2,1 Amps - 1400 R.P.M. with inherent thermal protector. IMPORTANT - When this motor is disconnected or the entire unit is disconnected, it is necessary - when resuming the electrical

connection to immediately make sure that drive motor rotates clockwise facing the unit front.

Failure to this, may result in wrong rotation of evaporator drum with the risk of major damages to the system.

B. Water failure Switch

This switch used as safety device when low or interrupted supply water conditions are encountered. Operates on pressure between supply line and feed line to water reservoir. Range is 0,8 bar (10 psi) off and 1,2 bar (17 psi). Cuts off complete unit and Resets automatically.

C. Ice Spout Safety Switch

Located on top of the Ice Spout, the Safety Switch is operated by a plate on top of the ice chute by the ice backing up in the spout. The switch will shut-off entire ice making mechanism.

D. Liquid valve Delay timer

Delays belay 18' refrigerant liquid valve opening at every start up of the ice maker.

Supplied.

E. Drum rotation delay timer

Delays drum STOP by 18' at every trip OFF of the ice maker. Supplied.

F. 3 - phases monitoring relay

On the power IN, it checks and assures correct rotation of the drive motor - evaporator drum.

Supplied.

G. Drum rotation control

It operates using the Hall effect sensor/ principle. In case the drum is not rotating at all (or it rotates too slow - less then 1/4 turn every 30") such relay trips the unit OFF so to avoid that in case of fiber keys breakage, the drive motor - gear reducer and compressor can operate with the drum OFF. Supplied.

H. Automatic Expansion Valve (A.E.V.)

The automatic expansion valve controls the refrigerant when passing from the liquid line to the evaporator. As the pressure decreases on the low side, the expansion Valve open and refrigerant escapes into the evaporator drum channel where it absorbs heat from water while evaporating. The valve maintains a constant pressure in the evaporator coil when the system is running indipendently of the amount of refrigerant in the system. This valve has an adjustment which may be manually regulated to give the evaporator coil the desired amount of refrigerant. Turning the adjustment to the left, counterclockwise, will increase the rate of flow which is controlled by the pressure in the evaporator. When the compressor is not running the valve remains closed as the low side pressure will be high enough to close the expansion valve.

- MAR Split 78-108-128 - is equipped with an expansion valve having an orifice of 2,5 m/m

- MAR Split 208-308 - is equipped with an expansion valve having an orifice of 4,5 m/m.

I. Evaporator Drum

Refrigerant inlet/outlet takes place on left side journal. The drum body is covered by a jacket in special stainless steel resistant to the water corrosion. The front edge of the scraping blade must have a clearance of minimum 0.10 m/m from cylinder metal jacket.

L. Refrigerant Seal System

Housed in the refrigerant inlet/outlet manifold located on the evaporator drum left side journal, is a leakproof joint. This joint is made with seals that are carefully designed and installed. The seals use two rubbing surfaces. One surface tourns with the cylinder journal and is sealed on it with on O ring of synthetic material. The other surface is stationary and fitted in its housing with leak-proof O rings. The rubbing surfaces (optically flats) are made of two different material that are: hardenend steel for the rotating ring and graphite for the stationary ring.

The rotating parts are: a) the spring collar b) the compression spring c) the stainless steel seal ring with O ring.

The stationary parts are: a) the graphitic ring with O ring b) the stainless steel housing ring with gasket

and O rings.

M. Heat Exchanger

MAR Split 78, 108, 128, 208 and 308 have a heat exchanger mounted in the suction and

Page 26

liquid line to reduce flash gas in the liquid line, to reduce liquid refrigerant in the suctionand to subcool the liquid refrigerant thereby increasing the operating efficiency.

N. Strainer Filter

All MAR Splits mount on liquid line a wiremesh type of filter to prevent that screen of filter of the expansion valve could becopme clogged from dirt thereby stopping the refrigerant flow. connections.

O. Motor Shaft Pulley

MAR Split units are generally equipped with "Step pulley" and by changing the belt from one groove to the other the speed of drum can be changed. MAR Machines are factory delivered with V belt on smaller dia V groove of step pulley to rotate the evaporator drum at the lowest possible R.P.M. to obtain "THICK" (2 m/m gauge) scale ice. Normal drum R.P.M. for "THICK" ice production are: MAR 78 - 1.1 RPM MAR 108 - 1.5 RPM MAR 128 - 2.4 RPM MAR 208 - 1.05 RPM MAR 308 - 1.6 RPM

P. V Belt

V belts used on motor shaft pulley and gear box are type:

MAR MAR MAR MAR MAR 78 108 128 208 308

X PZ 750 X PZ 900 X PZ 937

When changing the V belt from one groove to another, be careful to adjust it for proper tension and alignement. It should be snug not tight. A way to roughly check belt tension is to apply a firm hand pressure in the middle of the longest belt span. If the belt is correctly tensioned, you should be able to depress it about 5 m/m out of line.

Q. Gear Reducer

The gear reducer is mounted on the right side frame of evaporator drum basin to which it is firmaly secured with four nuts. The gear reducer bore in which passes the drum shaft to be driven, has a keyway. Two fiber keys are used to engage the gear reducer to the drum shaft, they are in series in the gear reducer bore, and shaft keyways. Should the driving strain be excessive, the two fiber keys will shear. MAR 78, 108 and 128 are equipped with a gear reducer having a ratio of 1/570. MAR 208 and 308 have a gear reducer with a ratio of 1/525.

The gear reducers are greased for life, therefore they do not require any maintenance.

R. Water pump / spay bar

Used only on FRESH WATER version the water pump is mounted on the rear left side of evaporator drum basin. It supplies water under gentle pressure to the spray bar located on top of evaporator drum.

S. Ice Level Control

Could not be necessary - It is subject to corrosion in marine application. Supplied.

T. ON/OFF switch

The manual start-up or switching of the entire system requires the attention of the operator who may instantly keep control of the situation, therefore it is preferable to any timed switch. Supplied.

U. Warning Lights

Monitoring unit performance and interventions of safety controls. Supplied.

V. Master Relay or Contactor

With electric coil connected in series with safety controls for operation in safe conditions of condensing and evaporating unit. Supplied.

W.Time Delay Relay

Mar Split series are equipped by two time relay delay (KT1 and KT2) which control operating condition of drive motor - gear reducer and liquid solenoid valve opening.

On each ice maker start up, at first, drive motor-gear reducer operates and KT1 liquid solenoid valve delay by 18' its opening, afterward opens and refrigerant pass through the same (KT1 Yellow LED steady).

In case of any ice maker devices trip OFF, KT2 relay keeps drive motor operating farther for 18' in order to clean up the evaporator from ice thus to assure easier/freely torque forcing of the same on next start up (KT2 Yellow LED blinks).

X. Daily timer

Could not be necessary - Can be used in place of the ice level control and of the ON/ OFF switch. Upon request.

Y. Liquid Line - Solenoid Valve

Necessary to stop refrigerant flow when not desired. To be located on the liquid line past the drier is electrically connected to compressor contactor or relay to stop flooding the evaporator and suction side during compressor off periods. Supplied.

Z. Hi and Lo Pressure indicating gauges

Could not be necessary - They are subject to setting alternations. Not supplied.

Page 27

The procedures provided in this section are arranged in order to make specific adjustment and removal and replacement information easy to locate.

Read the instructions throughly before performing any adjustment or removal or replacement procedures.

1. ADJUSTMENT OF THE AUTOMATIC

EXPANSION VALVE

The end to end frost on evaporator drum is the result of the correct expansion valve setting. This valve may be manually regulated by means of the adjusting stem. Turning the adjustment to the left counterclockwise, will increase the rate if refrigerant flow. Turning the adjustment to the right clockwise, the refrigerant flow to the evaporator is reduced. Use hex head wrench for manual adjusting operations.

WARNING - Be sure the electrical power supply and water supply are OFF, before starting any of the following REMOVAL AND REPLACEMENT procedures as a precaution to prevent possible personal injury or damage to equipment.

SECTION V

MAR SPLIT

ADJUSTMENT & REMOVAL & REPLACEMENT PROCEDURES

2. REMOVE AND REPLACEMENT OF EVAPORATOR DRUM REFRIGERANT SEALING DEVICES

1. Before removing the refrigerant manifold it is necessary - at first - to close the valve on liquid line. Upon low pressure switch cut-off, the main switch must be put in "OFF" position, then it is necessary to purge the refrigerant system. After these operations, the flare fitting at the inlet of refrigerant manifold can be disconnected as shown.

2. Remove the 4 allen screws of refrigerant outlet fitting to manifold.

Unloose and remove the 6 nuts with respective washers that secure the refrigerant manifold (1).

4. When removed the refrigerant manifold unloose and remove one of the three screws (11) securing the seal mechanism ring to the drum shaft journal.

5. Fit in place of it the screw of 4 MA supplied in the kit then tighten its nut.

6. Gradually unloose the two remaining screws and the nut till release the spring of seal mechanism.

7. Unloose the last screw to remove the seal mechanism ring as well as the seal mechanism S.S. ring and its spring.

8. Withdraw entirely the stainless steel ring (6)

that houses the graphitic seal ring.

Page 28

9. Check to see the surface conditions of cylinder shaft journal. It is of extreme importance that this surface be clean, smooth and polished. In case of scored surface it is necessary to stroke on it a very fine sand paper stripe. Check to see that washer (5) be properly clean and positioned with keyway to match the key.

10. If necessary replace the 0 rings of the S.S. ring that houses the graphitic ring.

11. Proceed attentively to examine the graphitic sulface of the seal ring. If this surface is no more perfect and optically flat, proceed to replace the seal ring in the following way. Lubricate the outer surface of the new seal ring with compressor oil and place it at the inferior of the housing ring.

12. Place on drum shaft the steel ring housing the graphite ring.

13. Mount on drum shaft journal the remaining portion of seal mechanism (S.S. ring and spring) (9) then the seal mechanism ring (10).

14. Fit the screw of 4 MA with its nut in one of the three threaded holes then screw down the nut in order to compress the spring.

15. When the seal mechanism spring has been partially compressed fit the other two screws and full compress the spring by screwing down gradually the three tightening point.

16. After have tightened the screws unloose the tie rod screw and replace it with the third one.

17. Clean carefully the inner surface of refrigerant manifold. Check to see the good condition of the seal ring (8) and fit it in its seat inside the refrigerant manifold. Fit on shaft end the washer (12) which keeps in place the seal ring (13) inside the refrigerant manifold and fit inside the manifold the gasket.

18. Position the manifold on the six monting studs, fit the six mounting nuts and washers and tighten all them down by means of a 10 mm. wrench.

19. Connect the outlet refrigerant line to the corresponding port of the manifold and tighten it with the four head necessed screw.

20. Connect the refrigerant inlet line on its manifold fitting and tighten the fitting flarenut.

3 REMOVAL AND REPLACEMENT OF

THE DRIVE MOTOR

A. To remove the drive motor assembly:

1) Remove screws and front, top and right side panels.

2) Slid-off V belt from motor pulley.

3) Unloose and remove hex head screw securing the pulley to motor shaft.

4) Disconnect wire leads to motor.

5) Remove two hex head bolts, lockwashers and washer, and nut which attach the sleigh support plate of motor to the side frame of evaporator drum basin.

6) Lift the sleigh plate with the drive motor out of the Chassis.

7) Unloose and remove 4 Nuts securing the motor to the sleigh plate.

B. To replace the Drive Motor Assembly reverse

the removal procedure.

4. REMOVAL AND REPLACEMENT OF GEAR BOX

A. Remove screws and front, top and right side

panels.

1) Slid-odd V Belt from gear box pulley.

2) Remove screw securing pulley on gear box input shaft.

3) Remove four nuts and washers which secure the gear box to the evaporator basin side frame.

4) With a mallet hit a bit the gear box to create some looseness.

5) With the help to two screw driver inserted between basin wall and flanged end of gear box, force the gear box to clear away from basin wall if you encounter an excessive resistance in this. If better to use a 2-jaws Puller.

6) When gear box is cleared away from the wall where it is mounted, pull it out from cylinder shaft.

A. To install the Gear Box Assembly reverse

the removal procedure taking care to center keyway of gear box bore to keys on cylinder shaft.

5. REPLACEMENT OF FIBER KEYS

A. The replacement of fiber keys is necessary

only when the keys are broken, so that they do not engage the gear motor with the evaporator drum drive shaft. In practical terms, the gear box does not drive the evaporator drum.

B. To reach the fiber keys to be replaced it is

necessary to remove the complete gear box. For this operation perform all steps at point

12.

Page 29

SECTION VI

MAINTENANCE & CLEANING INSTRUCTIONS

1. GENERAL

The periods and procedure 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 conditions and the ice volume produced and each ice maker must be maintained individually in accordance with is own particolar location requirements.

2. ICEMAKER/CONDENSING UNIT

THE FOLLOWING MAINTENANCE MUST BE SCHEDULED AT LEAST TWO TIMES PER YEAR ON THIS ICE MAKER. CALL YOUR AUTHORIZED SCOTSMAN SERVICE AGENCY.

1. Check and clean water line Strainer.

2. Remove top panel and depress the float to ensure that a full stream of water enters both Float & Drum Reservoirs.

3. Check that the ice maker cabinet is level in side-to-side and front-to-rear directions.

4. Check that the water level in the Drum basin is high enough to surround the wanted portion of revolving drum.

5. Clean the water reservoir and exterior of the drum assembly using a solution of SCOTSMAN Ice Machine Cleaner. Refer to procedure VI-3, CLEANING ICE MAKER.

NOTE. Cleaning requirements vary according local water conditions and individual user operation.

6. When doubtful about refrigeration charge, check gauge for compressor head pressure according to model technical specification.

7. Check gauge for Suction Line Pressure which varies depending upon models, inlet water temperature and ambient temperature.

8. Check drive motor operation. Normal operating temperatures are about 60°C (160°C) which is hot to touch. Check with amperometer Amps drawn.

9. Check V belt for concealed signs of wear and that has the correct tension. Check pulleys alignements and also that drive motor and gear box hold down bolts are tight enough.

10. Make sure that water lines in water cooled condenser are free from any excess of water minerals: otherwise arrange to clean the tubes with a power driven wire brush or running through it a weak acid solution made with 20 percent of hydrocloric acid.

11. Check for refrigerant leaks and for proper frost line, which should frost out of accumulator at least half way to the compressor and in some areas, back to service valve. Check for dryness of system through moisture indicator if any.

12. Check for water leaks. Tighten drain line connections. Pour water down drain to be sure that drain line is open and clear.

13. Check the quality of ice. Ice flakers should be dry and have a thickness gauge of about 2 m/m.

14. Check compressor oil level through sight glass. Stop unit operation and after two/three minutes see that oil level is 2/3 millimeters above center line of sight glass.

15. Be sure of proper position and condition of plexiglass chute on spout opening.

3A.CLEANING INSTRUCTION

(MAR 78-108-128)

1. Disconnect power front the unit.

2. Remove screws and top panel

3. Remove evaporator cover panel

4. Close water inlet valve located at evaporator side onto water inlet line.

5. Press water hose clamp in order to release it

Page 30

6. Lift the water pump up to release it from sliding holding screw

7. Carefully push little bit water sump bracket

in ordet to release it

8. Lift the water reservoir up for a while and bend it in order to dump contained liquid

9. Push water hose quick fitting ring

......to release the nylon tube

......and remove water sump from evaporator basin

10. By the help of flat screwdriver easily open little bit float valve holding arms and remove it from holders

11. Check nozzle orifice condition. In case of obstruction clean it by pin

12. Prepare a solution in a bucket by mixing for 1/2 liter of SCOTSMAN CLEANER with 5 liters of warm (40-50°C) water.

WARNING: When using any chemical, wear hands protection (gloves). SCOTSMAN Ice Machines Cleaner contains phosphoric and Hydroxiacetic acid. These compound are corrosive and may cause burns if swallowed. DO NOT induce vomiting. Give large amount of water or milk. Call Physician immediately. In case of external contact, flush with fresh water. KEEP OUT OF THE REACH O CHILDREN.

Page 31

13. Dip the water reservoir removed at #7 into the cleaning solution and clean it by sponge and/ or suitable brush.

14. Once reservoir is duly cleaned, dump float valve in the solution and remove any kind of scale or mineral deposit then rinse the same by fresh water.

15. Place again float valve into its bracket

16. Reinstall water sump with float valve.

17. Reinstall water pump removed at #6.

18. Reconnect water inlet hose removed at #5.

19. Slowly pour the solution mixed at #12 in the water reservoir till to 2 cm (7,87") below top edge.

20. Plug IN the ice maker and let the unit in operation for about 10 minutes.

21. Disconnect again unit from power.

22. Repeat again from #5 to #9 thus to dump reservoir from chemical solution and later rinse all parts by fresh water.

23. Reinstall all removed part from #9 to #5.

24. Prepare as per #12 using SCOTSMAN sanitizer rather then cleaner. Possible sanitizing solution could be by mixing 1,5 cl (5 oz) of sanitizer with 5 lt (1 gallon)

NEVER MIX CLEANING WITH SANITIZING SOLUTION

25. Pour sanitizing solution in the water reservoir.

26. Plug IN again the unit and let the sanitizing solution re-circulating for about 5 minutes.

27. Repeat #5 to #8.

28. Lift the water sump up for a while in order to dump sanitizing solution stored in the same then relocate the same.

29. Reinstall water pump and connect water inlet hose.

30.

Open water inlet valve previously closed at #4.

31. Ice produced during the first 5 minutes must be thrown away in order to avoid any possible chemical contamination.

CAUTION - NEVER use ice produced from any chemical solution. Be sure none falls into storage bin.

3B.CLEANING INSTRUCTION

(MAR 208-308)

1. Disconnect power front the unit.

2. Remove screws and top panel

3. Remove evaporator cover panel

4. Close water inlet valve located at evaporator side onto water inlet line.

Page 32

5. Bend down the plastic hose and drain out rthe water from the water sump than move it up again.

6. Prepare a solution in a bucket by mixing

1 liter of SCOTSMAN CLEANER with 10 liters of warm (40-50°C) water.

7. Slowly pour the solution mixed at #6 in the water reservoir.

8. Plug IN the ice maker and let the unit in operation for about 10 minutes.

9. Disconnect again unit from power.

10. Repeat again #5 to dump reservoir from chemical solution and later rinse all parts by fresh water.

11. Prepare as per #6 using SCOTSMAN sanitizer rather then cleaner. Possible sanitizing solution could be by mixing 3 cl (10 oz) of sanitizer with 10 lt (2 gallons) of warm potable water.

NEVER MIX CLEANING WITH SANITIZING SOLUTION

12. Pour sanitizing solution in the water reservoir.

13. Plug IN again the unit and let the sanitizing solution re-circulating for about 5 minutes.

14.Repeat as per #5 to dump sanitizing solution stored in the same then relocate the same.

15.

Open water inlet valve previously closed at #4.

16. Ice produced during the first 5 minutes must be thrown away in order to avoid any possible chemical contamination.

CAUTION - NEVER use ice produced from any chemical solution. Be sure none falls into storage bin.

Page 33

SECTION VII

SERVICE DIAGNOSIS

The Service Diagnosis Section is for use in aiding the servicemen in diagnosing a particular problem for pin-pointing the area in which the problems lines, thus an ever available reference for proper corrective action.

The following chart lists corrective actions for the causes of known symptoms of certain problems that can occur in the ice making refrigerarion system.

SYMPTON POSSYBLE CAUSE CORRECTION

Lo-refrigerant press. Incorrect refrigerant Add refrigerant to raise suction

suction pressure. pressure.

Raise head press. Control setting.

Moisture in system. Check moisture indicator and Overcharge of oil in system. remove charge and drier.

Replace & recharge the system.

Not enough refrigerant. Check for refrigerant leak.

Lo-water level. Intermittent water supply Water shut-off valve closed.

or too low water pressure. Check and clean water strainer.

The compressor runs but the Drive motor gear reducer Check. Repair or replace. unit does not make ice. inoperative.

V-belt loose or broken Check. Repair or replace. Key may sheared. Check. Repair or replace.

Gear reducer with one Check. Repair or replace. gear stripped-gff. Pulley loose on motor shaft.

Water not entering reservoir. Check and clean. Water float

valve to be cleaned.

Excessive Hi-pressure control cut-off Check cooling water at Hi-pressure unit operation. condenser. Condenser tube

clogged-up. Water regulating valve to be re-adjusted.

1. ICE MAKING - REFRIGERATION SYSTEM

Page 34

SYMPTON POSSYBLE CAUSE CORRECTION

Unit will not run. Blown fuse. Replace fuse and check for

cause of blow fuse. Loose electrical connection. Check wiring. Switch in OFF position. Turn switch to ON. Inoperative master switch. Replace switch. Spout switch cut-out. Check ice chute arrangement.

Excessive noise. Misaligned V-belt. Aligne V-belt.

Gear reducer loose on frame. Tighten. Drive motor end-play or worm Repair or replace.

bearings.

Excessive vibration. Ice formation underneath Remove blade amd melt-up

blade-frictioning against ice formation. rotating drum. Lower water level to correct

value.

Making wet ice Surrounging air temperature Correct or move unit to cooled

above 40°C (100°F) location. Under-or-over-charge of refrigerant.

Re-charge with proper amount. Closed AEV. Adjust valve for correct refrigerant

flow. Faulty compressor valve plate. Repair or replace.

Low ice production. Loss of refrigerant, under Check and recharge with

or overcharge of refrigerant. proper amount of refrigerant. Plugged condenser water tubes. Clean condensor. Low water level in the reservoir. Check float valve operation. Overcharge of oil in system. Check at oil sight glass.

Lower to 1/2 sight glass. Water pump out of operation. Replace water pump. Spray bar clogged. Clean spray bar.

Page 35

SECTION VIII

WIRING DIAGRAMS (MACHINE OPERATING)

This section is provided as an aid in understanding the electrical circuit of the MAR Split Unit.

WARNING - When conducting a continuity check of the MAR Unit:

1. Disconnect the main power source.

2. DO NOT use an incandescent lamp or jumper wire, conduct all tests with a voltohm-meter.

B - WHITE G - GREY M - BROWN

A - BLUE

N - BLACK

G-V - YELLOW-GREEN

MAR SPLIT

Scotsman MAR 78, MAR 128, MAR 108, MAR 208, MAR 308 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual