Scotsman MAR 76 User manual

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Scotsman Ice Srl
Via Lainate, 31 - 20010 Pogliano M.se - Milano - Italy
Tel. [phone] (Aut. Sel.)- Telefax [phone]
Direct Line to Service & Parts:
Phone [phone] - Fax [phone]
Website: www.scotsman-ice.it
E-Mail: [email protected]
ISO 9001 - Cert. n. 0080
SERVICE MANUAL
MAR 56
MAR 76
MAR 106
MAR 126
MAR 206
MAR 306
Scale ice machines
MS 1000.66 - REV. 06/2018

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FOREWORD
The "MAR" ice makers make flake ice of "scale"
typewhichisflat,harddryandsub-cooled,giving
to it an exceptional staying power for multiple
chilling operations.
Thedesignsimplicityaccountsfortheconfidence
in MAR scale ice machines. Their ice making
systemhasonlyonesealedmovingpart,resulting
in a minimum of maintenance operations for
continuous reliable machine service.
Ice is discharges through a large opening on the
backofunitcabinet,whenmountedontopofthe
refrigerated room, ice is gravity fed to storage
area.
Rugged, solid, heavy duty, the stainless steel
MAR cabinet has removable panels that facilita-
te the accessibility to mechanical and electrical
parts. A console panel with lights monitoring
water flow pressure, and temperature operating
refrigerant pressure and motors overloading
forewornthesystemmalfunctionbeforebecoming
major trouble.
We suggest you to take time now to read this
manual which contains a lot of valuable
informations on the MAR ice making system.
Ifyouhaveanyfurtherqueriesregardingthecare
or operation of the machine, please contact:
NOTE: Whenever writing please state model no. and serial no. of the machine
ICE SYSTEMS
®
SCOTSMAN - EUROPE - FRIMONT SPA
Via Puccini, 22 - 20010 Bettolino di Pogliano (Milano) Italy
Tel. [phone] (Aut. Sel.)- Telefax [phone]
Direct Line to Service & Parts:
Phone [phone] - Fax [phone]
Website: www.scotsman-ice.com
E-Mail: [email protected]
®

TABLE OF
CONTENTS
Foreword page 2
Table of contents 3
Specifications - MAR 56 - 76 - 106 - 126 4-5-6
Specifications - MAR 206 - 306 7-8
Remote cond. 9
Section I GENERAL INFORMATIONS & INSTALLATIONS
Description 10
Unpacking & Inspection 10
Location & Levelling 11
Electrical connections 12
Water supply & Drain connections 12
Remote air cooled condenser installation 13
Ice level control 14
Ice chute 15
Final check list 15
Unit installation practice 15-16
Section II OPERATING INSTRUCTIONS
Start-up 17
Water & Refrigerant circuit 18-19
Section III PRINCIPLES OF OPERAZION - HOW IT WORKS
Ice maker 20
Electrical / Refrigeration 21-22-23
Refrigerant charge 24
Mechanicals 24
Section IV ADJUSTMENT & REMOVAL & REPLACEMENT
PROCEDURES
Water regulator assy 25
Automatic expansion valve 25
V Belt change on pulley 25
Compressor replacement 25
Water cooled condens. replacement 26
Water regulator replacement 26
Drier replacement 26
Drive motor replacement 27
Gear Box replacement 28
Fiber key replacement 28
Section V MAINTENANCE & CLEANING INSTRUCTIONS
General 29
Ice maker 29
Cleaning instruction 29-30-31-32
Section VI SERVICE DIAGNOSIS
Ice making - Refrigerant system 33-34
Section VII WIRING DIAGRAMS 35
MAR 56-76-106-126 - Wiring diagram 36÷38
MAR 206-306 - Wiring diagram Fig. 1 e 2 39÷42

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SPECIFICATIONS
NOTE. Daily ice capacity is directly related to condenser air water inlet temperature, water
temperature to make ice - and age of machine.
To keep your SCOTSMAN MAR performing at is maximum capacity, it is necessary to perform
periodic maintenance as outlined on page 29 of this manual.
MAR 56
AIR & WATER COOLED MODELS
THICK SCALE ICE
THIN SCALE ICE
ice making capacity
500
450
400
350
300
250
200
Kg./24 h
38 °C
32 27 21 15
°C
10
21
32
38
o
AIR COOLED MODELS
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
32
38
WATER COOLED MODELS
10 5
10
21
500
450
400
350
300
250
200
Kg./24 h
38 °C
32 27 21 15
°C
DE 10 A' 38
o
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
10 5
MAR 76
AIR & WATER COOLED MODELS
ice making capacity THICK SCALE ICE
THIN SCALE ICE
AIR COOLED MODELS
540
500
460
420
380
340
300
Kg./24 h
38 °C
32 27 21 15
°C
o
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
10 5
10
21
32
38

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SPECIFICATIONS
NOTE. Daily ice capacity is directly related to condenser air water inlet temperature, water
temperature to make ice - and age of machine.
To keep your SCOTSMAN MAR performing at is maximum capacity, it is necessary to perform
periodic maintenance as outlined on page 29 of this manual.
MAR 106
AIR & WATER COOLED MODELS
THICK SCALE ICE
THIN SCALE ICE
ice making capacity
MAR 126
AIR & WATER COOLED MODELS
ice making capacity THICK SCALE ICE
THIN SCALE ICE
AIR COOLED MODELS
750
700
650
600
550
500
450
Kg./24 h
38 °C
32 27 21 15
°C
o
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
10 5
10
21
32
38
WATER COOLED MODELS
800
750
700
650
600
550
500
Kg./24 h
38 °C
32 27 21 15
°C
DE 10 A' 38
o
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
10 5
AIR COOLED MODELS
1000
950
900
850
750
650
600
Kg./24 h
38 °C
32 27 21
°C
o
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
10
21
32
38

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MAR 56-76-106-126 - SPECIFICATIONS
BASIC ELECTRICALS: 400/50/3N
* at 21 °C amb. / 15 °C water temp.
Water req. (l/h) Total Amps.
MODELS Finish
* Cond. Prod. 400 V kg. lbs.
MAR 56 AS Air 2 16 2.2 5 x 1.5 2.7 Stainless 194 427
MAR 56 WS Water 2 225 16 2.2 5 x 1.5 2.7 Steel 174 383
MAR 76 AS Air 2.5 21 2.5 5 x 1.5 2.7 Stainless 204 450
MAR 76 WS Water 2.5 300 21 2.5 5 x 1.5 2.7 Steel 201 442
MAR 106 AS Air 4 30 3.5 5 x 1.5 5 Stainless 221 487
MAR 106 WS Water 4 480 30 3.5 5 x 1.5 5 Steel 217 417
MAR 126 AS Air 4.5 41 4.5 5 x 1.5 6.5 Stainless 226 497
MAR 126 WS Water 4.5 41 4.5 5 x 1.5 6.5 Steel 222 488
Cond. Compr. Power Minimum
Unit (HP) (KW) wire size (mm)
Shipping weight

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SPECIFICATIONS
NOTE. Daily ice capacity is directly related to condenser air water inlet temperature, water
temperature to make ice - and age of machine.
To keep your SCOTSMAN MAR performing at is maximum capacity, it is necessary to perform
periodic maintenance as outlined on page 29 of this manual.
MAR 206
AIR & WATER COOLED MODELS
ice making capacity THICK SCALE ICE
THIN SCALE ICE
1700
1600
1500
1400
1300
1200
1100
Kg./24 h
38 °C
32 27 21 15
°C
32
38
AIR COOLED MACHINES
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
32
38
WATER COOLED MACHINES
10 5
10
21
1900
1800
1700
1600
1500
1400
1300
Kg./24 h
38 °C
32 27 21 15
°C
DE 10 A' 38
o
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
10 5
10
21
MAR 306
AIR & WATER COOLED MODELS
ice making capacity
2600
2400
2200
2000
1800
1600
1400
Kg./24 h
38 °C
32 27 21 15
°C
32
38
AIR COOLED MACHINES
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
32
38
WATER COOLED MACHINES
10 5
10
21
2800
2600
2400
2200
2000
1800
1600
Kg./24 h
38 °C
32 27 21 15
°C
DE 10 A' 38
o
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
10 5
10
21
THICK SCALE ICE
THIN SCALE ICE

MAR 206-306 - SPECIFICATIONS
BASIC ELECTRICALS: 400/50/3N
* at 21 °C amb. / 15 °C water temp.
Water req. (l/h) Total Amps.
MODELS Finish
* Cond. Prod. 400 V kg. lbs.
MAR 206 AS Air 5 69 7 5 x 2.5 17 Stainless 374 824
MAR 206 WS Water 5 1200 72 7 5 x 2.5 10 Steel 369 813
MAR 306 AS Air 10 88 10 5 x 4 20 Stainless 383 844
MAR 306 WS Water 10 1600 94 10 5 x 4 20 Steel 413 910
Cond. Compr. Power Minimum
Unit (HP) (KW) wire size (mm)
Shipping weight
Page 8

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CONDENSER CAPACITY FAN MOTOR AIR FLOW
20 KW - 17200 Kcal/h 230/50/1 V - 0,8 A 4320 m3/h
MAR 306 REMOTE CONDENSER
TECHNICAL SPECIFICATIONS

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SECTION I
GENERAL INFORMATION & INSTALLATION
1. DESCRIPTION
An attractive compact cabinet of stainless steel
with control panel lights on the front. All panels
are removable to allow easy access to electrical
and mechanical components for cleaning and
maintenance.
Sealed Refrigeration System
To provide quite efficient operation of the ice
maker, the compressor is mounted on rubber
cushions.Thewatercooledmodels haveatube
within tube condenser with water regulation val-
ve for correct condensing water flow. The air
cooledmodels,excepttheMAR306haveabuilt
in condenser in copper and aluminium with the
fan motor controlled by pressure control. The
evaporator drum is powered by a separate drive
motorconnectedbyaV-beltandpulleysystemto
adoublegearbox.TherefrigerantusedisR404a
controlled by automatic expansion valve.
Storage Bin or Ice Room
Since the MAR Scale is a continuous flow type
ice maker and does not have its own attached
storagebin,itisnecessarytouseanauxiliarybin
or a pre-fabricated ice room for appropriate ice
storage.
Ice storage situations are of two kinds:
a) Short term storage
b) Extended terms storage
Being, as stated, scale ice made by MAR
machinesflat, dry andsubcooled, therefore with
the tendency to stick toghether, particular
attention is required for proper ice storage
conditions for better ice handling. An insulated
icestoragebinor roomsisalwaysrequired,then
according to ice end use application, this can be
refrigerated on non-refrigerated.
Also a weight volume ratio of 2,1 cu. mt. per
ton, must be taken into consideration for correct
ice storage.
a) Non-refrigerated room for short term
storage.
Thescaleiceisproduced continuouslyfor24
hours per day, whereas the use period is
generally for no longer than 8 hours per day.
Thereforestoragefacilitiesshouldbeprovided
to accomodate a minimum of 16 hours of
production, this means that every scale ice
machine must be installed with a properly
insulated storage room which should have a
minimum capacity of 2/3 the daily ice
production.
Withawellinsulatedroomanddulysubcooled
scale ice, the limited losses of heat throught
the walls of a properly designed room with
adequate arrangements, are largely offset,
and excess melting will not occur. In most
situationswherewholequantityoficeproduced
isbeingusedonadailybasis,itisnotnecessary
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
considerabledistance,suchasaboardfishing
vessels, or in locations with normal ambient
temperatures conditions, or when used in
industrialplantswheredemandisintermittent,
its subcooling power must be absolutely
preserved in the storage bin by a proper
cooling system keeping air temperature at a
pre-establishedandconstantvalue.Theideal
icestorageroomisthetypewithmechanically
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 tempera-
ture of -6°C minimum (20°F).
2. UNPACKING AND INSPECTION
1. Call your authorized SCOTSMAN Distributor
od Dealer for proper installation.
2. Visually inspect the exterior of the shipping
container and skid and any severe damage
noted should be reported to the delivering
carrier; and a concealed damage claim filled
subject to internal inspection, with carrier
representative present.
3. Removethepackingandremovetheshipping
bolts and the shipping base or skid.
4. When necessary, install the leg levellers in
the cabinet base sockets; then, raise the
cabinet to the upright position.
5. Remove screws and shipping tapes and all
doorsandservicepanelsfromthecabinetand
inspect for any concealed damage.
Notifycarrierofanyconcealeddamageclaims
as stated in step 2 above.
6. Remove all internal support packing, tape
and wires in machinery compartment.
7. Check that refrigerant lines do not rub or
touch lines or surfaces and that fan blades, if
any, moves freely.
8. Checkthatcompressorissnugonallmounting
pads.
9. Use clean damp cloth or disposable paper
wiperto wipe clean theexterior surface of the
cabinet.

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CONDENSING AIR FLOW SCHEMATIC
2. Erection - For elevations in excess of four
feet or in close quarters, chain falls of fork lift
truck should be used. For location under four
feet,theuseofskidboardsandrollersispractical.
3. MachineSite-Whenselectingthepermanent
location of air cooled machines, consideration
must be given to volume size of the room and to
ventilationfacilitiesforeasyheatremovalaround
the machine.
In doing this it worths to take on account that:
– MAR 56 AS - has a condenser heat rejection
of 3000 Kcal/hr and fan motor draws air for
1200 m3/h.
– MAR 76 AS - has a condenser heat rejection
of 4900 Kcal/hr and fan motor draws air for
1200 m3/h.
– MAR 106 AS - has a condenser heat rejection
of 7500 Kcal/hr and the two fan motors draw
air for 1200 m3/h each.
– MAR 126 AS - has a condenser heat rejection
of9750Kcal/hrandthetwofanmotorsdrawair
for 1200 m3/h each.
– MAR 206 AS - has a condenser heat rejection
of 11000 Kcal/hr and the two fan motors draw
air for 2000 m3/h each.
– MAR 306 AS - has a condenser heat rejection
of17200Kcal/hrandthetwofanmotordrawair
for 4320 m3/h in total.
4. Position the MAR in the selected permanent
locationlevel the cabinet on boththe left-to-right
and front-to-rear directions. The levelling legs
can be adjusted with an opened wrench.
(Seeunitlayoutanddimensionsatpage6and8).
10. See DATAPLATE 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 program.
11. RemovetheManufacturer'sregistrationCard
from its envelope and fill in all spaces
including:ModelNumberandserial Number
taken from the aluminium plate located on
the front of the Chassis base, with Front
Panel removed.
Forward the completed, self addressed,
registration card to the Scotsman Europe
Frimont Factory.
3. LOCATION AND LEVELLING
WARNING - The MAR Flakers are NOT
designed for outdoors installation where
air temperature are below 5°C (40°F) or
above 40°C (100°F) and the water tempe-
rature is below 5°C (40°F) or above 35°C
(95°F).
Extended periods of operation at
temperaturesexceedingtheselimitations
willconstitute misuse,underthetermsof
the SCOTSMAN Manufacturer's limited
warranty coverage.
1. Stands - A special stands should be built if
the machine is located beside the bin.
Care should be exercised in making the
stand strong enough to support the weight.
In designing the stand plan for the servicing
of the machine from front, top and sides.
It is also possible to locate the machine on
topofthebin.Careshouldbeusedinselecting
a bin that has been specially reinforced.
Standard bins are usually not sufficiently
reinforced for this purpose. An unsteady
platform will cause excessive vibration.
Speciallybuiltbinscanprovidepropersupport
and allow for a servicing platform.
WARNING - Air Cooled version of MAR 76 ,
MAR106,MAR126and MAR206havethe
condensing air exhaust throughout the
lower rear area (ice spout side) therefore
itisnecessary to avoidtopositionthe ice
maker with the rear side against any sort
of wall that will prevent proper warm air
dissipation.They must have on their rear
side an air gap of 200 mm. MAR 56 has the
air cooled condenser on the right side
while MAR 306 has a se-parate remote air
cooled condenser. (See instructions for
remote condenser at 6).
MAR 76-106-126
MAR 206
MAR 56
MAR 76-106-126
MAR 206
MAR 56
SIDE
MAR 106 -
MAR 206 -

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4. ELECTRICAL CONNECTIONS
The machine has been wired ready for electric
connections. See nameplate for current
requirements to determine wire size to be used
forelectricalhook-up.TheMARflakerrequiresa
solid earth ground wire. See wiring diagram.
Becertaintheunitisconnectedtoitsownelectrical
circuit and individually fused.
Themaximumallowablevoltagevariation,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 damage to the
overload switch and motor windings.
AllexternalwiringshouldconformtotheNational,
State and local electrical permit and services of
a licensed electrician will be required.
WARNING - The compressor is equipped
with a crankcase heater which has to be
energized even when the ice maker is
switched-off. So, make sure to connect
the unit with the compressor crankcase
heater constantly energized. After long
inoperative periods remember to give
current to the heater 4 hours before the
ice-maker start-up.
Fuse protection of the unit should be made as
follows:
MAR 56-76-106-126-206 - 3x16 Amps/400V
MAR 306 WS - 3x24 Amps/400V
MAR 306 ASR - 3x32 Amps/400V
WARNING - Drum drive motor is three-
phasestype.Atunitstartup,correctwiring
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
ElectronicControltripstheunitOFFsoto
avoid that compressor can operate with
the drum OFF (in case of fiber keys , drive
motor or gear reducer breakage).
Incaseofanyfield drive motor replacement,
caremustbetakentoitswiring,checkingthe
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.
5. WATER SUPPLY AND DRAIN CONNECTIONS
Separate water supplies are recommended.
A.Evaporatororicemakingsupplywatershould
be run through a hand shut-off valve before
entering unit. Evaporator supply water
connection has a 3/4" male pipe fitting. This
line also has factory installed water strainer
internally mounted. Incoming water goes
through the float reservoir and then to the
drum reservoir. Connect to a good cold water
supply with minimum 1/2 O.D. line. A check
valve on this line will be required in some
cases depending on local plumbing codes.
The recommended minimum water pressure
is 1 bar (14 Psi). Do not operate this unit with
fresh water supply below 1 bar (14 Psi).
Maximum water pressure 5 bar (70 Psi).
B.The condenser water supply line connects to
the following fitting sizes:
MAR 56 - 76 3/4" gas male
MAR 106 - 126 12 mm O.D. fitting
MAR 206 20 mm 0.D. fitting
MAR 306 25 mm
Water supply line size must be adequate to
water flow which, at 15°C temperature water, is:
225 lt/hr for MAR 56
300 lt/hr for MAR 76
480 lt/hr for MAR 106
lt/hr for MAR 126
1200 lt/hr for MAR 206
1600 lt/hr for MAR 306
Incoming water goes throughout the water
regulating valve first and then to the water
cooled condenser. Observe arrow on water
regulatingvalve.Watersupplymustbeinstalled
to conform with local code. In some case a
licensedplumberand/oraplumbingpermitwill
be required.
Water Quality
Water quality is a factor of extreme importance
for good operation of MAR machine. Water
shouldn't be too hard neither too soft.
Hardwaterwilltend tocreatemineraldepositsin
water reservoir, evaporator drum and scraping
blade, rendering rough the chute surface which
prevents ice scales from sliding properly into ice
channel. On the contrary, water too soft, (de-
mineralized) will cause the ice skin to stick
excessively on drum surface rendering difficult
the scraping operation of same.
The ideal water should have a total hardness
of about 15-20 french degrees.
Precaution Against Water Frost
Like for any other ice maker all necessary
measures must be taken when the cold season
is approaching to protect the water supply line
and the MAR water system against winter
freezing. If cooling tower is used several
precautions should be observed, too.
1.Leave water regulating valve in the system.
2. Separate the make-up water for the reservoir
from the tower water.
3. Use3/4"towerwaterlinesorlarger,depending
on the lenght of run. Over 30 feet, use 1" O.D.
lines.
4. NOTICE: a cooling tower can freeze in the
winter time and the MAR flaker will be in
operation12monthsperyear.Anindoortower
andpumpcanbeusedwithoutdoorsairducted
in and out if the fan cycles on water tempera-
ture to prevent freezing. An indoor sump can
be used. An auxiliary tower and city-water
hook-up will prove satisfactorily in some
climates. Fresh water in the winter and tower
water during the summer. Consult your tower
and pump manufacturers for proper sizing. In
noeventshouldlessthanaNominal3to4tons
tower,orlessthan3/4HPhighpressuretower,
orlessthan 3/4 HP high pressuretowerpump
be used.

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C.Drain (When not re-used).
The recommenden tubes for the condenser
waste line are:
- MAR 56-76 - 3/4" GAS female fitting.
- MAR 106-126 - 12 mm I.D.
- MAR 206-306 - 25 mm I.D.
Water drip tray drain line is 21 m/m I.D. Tube
to be connected with clamp to a 21 m/m hose
barbed fitting for all models.
Wastewater line must run toan open trapped
venteddrain.Ifdrainisalongrun,allowapitch
of 3 cm per meter.
6. REMOTE AIR-COOLED CONDENSER
AND PRECHARGED REFRIGERANT
LINES INSTALLATION (MAR 306 ONLY)
Use the following for planning the placement of
the condenser relative to the ice machine
Location Limits - condenser location must
not exceed ANY of the following limits:
• Maximum rise from the ice machine to the
condenser is 3 physical meters
• Maximum drop from the ice machine to the
condenser is 1 physical meter
• Physical line set maximum length is 6 meters
• Line set length maximum is 9 meters.
Calculation Formula:
• Drop = dd x 6.6 (dd = distance in meters)
• Rise = rd x 1.7 (rd = distance in meters)
• HorizontalRun=hdx1(hd =distanceinmeters)
• Calculation: Drop(s) + Rise(s) + Horizontal
Run = dd+rd+hd = Calculated Line Length.
Configurations that do NOT meet these
requirements must receive prior written
authorization from Scotsman.
Do NOT:
•Routealinesetthatrises,thenfalls,thenrises.
• Route a line set that falls, then rises, then falls.
Calculation Example 1:
The condenser is to be located 0.9 meter below
theicemachineandthen3metersawayhorizontally.
0.9mtx6.6=5.94+3=8.94.Thislocationwould
be acceptable.
Calculation Example 2:
The condenser is to be located 4 meters above
and then 3 meters away horizontally.
4 x 1.7 = 6.8 6.8+3 = 9.8. 9.8 is greater than
the 9 maximum and is NOT acceptable.
Operating a machine with an unacceptable
configurationg will void the refrigeration
system warranty.
Inacrate,separatedbytheunitcratearepacked:
1. The air-cooled condenser mounted on the
platformbasewiththeelectricaljunctionbox,
condensershround,fanmotors,fanprotection
grid, fan motor speed, control and the
refrigerant lines connection couplings.
2. One set of pre-charged refrigerant line with
connectioncouplingsonbothendsoffollowing
variety. Liquid I.D. 12 m/m - Gas I.D. 16 m/m
- 10 mts length.
Thepre-chargedrefrigerantlines,6meterslong,
are equipped with self-sealing coupling
connectionsandcanbeconnectedordisconnect
few times without loosing the refrigerant charge.
The electric cord line, approx. 10 meters long,
located on the left side of the unit has to be
connected to the condenser junction box
terminals.
Thecondenserfanmotorsareoriginallywiredfor
230 V single phase and have the following
specifications:
RPM 1420
WATTS 2x180
AMPS 2x0,80
They operate at 230 V 50 Hz and are controlled
byanElectronicFanSpeedControlsetat16bar.
A. Location consideration:
1. Limitto10metersthelenghtoftheprecharged
refrigerant lines from the ice-maker to the
remote condenser.
2. Maximum vertical rise of 3 meters between
the ice maker and the remote condenser.
3. Best available location, protected from the
extremes of dirt, dust, rain, sun and wind.
B. Unpacking and inspection:
1. Visually inspect the exterior of the shipping
container and any severe damage noted,
shouldbereportedtodeliveringcarrier;anda
concealed damage claim filled subject to
internalinspectionwithcarrierrepresentative
present.
2. Uncrate the remote condenser and pre-
charged refrigerant lines and inspect for any
concealeddamageclaims,asstatedinstep1
above.
3. Check that the pre-charged refrigerant lines
are intact, not kinked, and that there is no
sealed puncture or loss or refrigerant.
Max 3 m
Max 1 m
Condenser
Distance &
Location
Schematic
Remote
Condenser
Located BELOW
Ice Machine
Remote
Condenser
Located ABOVE
Ice Machine

C. Remote condenser - Wall attachment
1. Install and attach the remote condenser to the
wall of the building, using the methods and
practices of building standards that conforms
to and meets the local building code
requirements in your area.
D. Remote Condenser Electrical connection
Connect the electric cable from Remote
Condenser to the terminal board of the machine
as described in the following.
1. Remove jumper from contact 17 and 18 of the
machine terminal board.
2. Connect Remote Condenser BLU wire to
Neutral (N) of machine terminal board.
3. Connect Remote Condenser BROWN wire to
contact n. 18 of machine terminal board.
4. Connect Remote Condenser GREEN/YELLOW
wire to the grounding related screw.
E. Pre-charged refrigerant lines
1. The set of pre-charged refrigerant lines
consists of a self-sealing liquid line and a self-
sealing discharge line.
One coupling on each line is fitted with a
Schrader valve, which provides the
servicemen with access for refrigerant
evacuation through tubes, refrigerant charging
and service gauges application when
necessary.
2. When possible, route the maximum lenght of
the pre-charged refrigerant lines inside the
building, with the minimum lenght outside, to
prevent vandalism and to minimize the
condenser effect that exposed lines can pro-
duce in cold weather.
Insulate lines that be exposed to outside
temperatures that will be below freezing, for
extended periods of time.
CAUTION - Each coupling on the set of
pre-charged refrigerant lines, the
refrigerant fittings on the remote
condenser and on the icemaker chassis
are self-sealing and should be tightened
1/4 turn more than snug tight.
ALWAYS USE TWO WRENCHES WHEN
TIGHTENING THESE FITTINGS ONE AS A
BACKUP WRENCH TO PREVENT
TWISTING OF TUBING AND POSSIBLE
KINKING OR LINE RUPTURE.
3. Connect the small dia refrigerant line coupling
to the unit fitting labelled "LIQUID" on the right
side of the icemaker chassis.
4. Connect the large dia refrigerant line coupling
to the unit fitting labelled "GAS" on the righ
side of the icemaker chassis.
5. Connect the small dia refrigerant line coupling
with Schrader valve to the condenser fitting
labelled "LIQUID".
6. Connect the large dia refrigerant line coupling
with Schrader valve to the condenser fitting
labelled "GAS".
F. Excess lenght of pre-charged refrigerant lines;
at installations where the icemaker chassis-
to-remote condenser refrigerant line path is
substantially less than the lenght of pre-
charged refrigerant lines to be installed, route
and dress the excess refrigerant line as
follows.
1. Follow straight line routing when possible.
2. Retain excess pre-charged refrigerant line
inside the building.
3. Spiral the excess lenght of the precharged
refrigerant lines in the best selected inside
location and in a manner that prevents
refrigerant trapping.
Page 14

CAUTION - DO NOT kink or crimp the
refrigerant lines.
DO NOT bend excess refrigerant lines in
a vertical loop (s), which allow trapping
of refrigerant in LOW sections during
OFF time.
Bendandshapeexcessrefrigerant lines
in VERTICAL spirals, not HORIZONTAL
spirals. See Figure above.
7. ICE LEVEL CONTROL
The MAR flake ice system are equipped with
andadjustablethermostaticcontrolthatcutsoff
icemakingoperationwhenitssensingbulbgets
in contact with the ice deposited in the storage
bin.Thetemperaturerangedialgoesfrom+10°C
to-35°Canditslong capillary (3.5m.)attaching
the liquid filled bulb, should be conveniently
positioned in the storage room at the desired
height by holding it with an appropriate bracket
to be arranged in accordance with the location
possibilities. These controls may or may not be
used, it depends of storage room arrangement
and its inner temperature that must be higher,
anyway, to that of the ice produced.
Incaseofaprevailinglowthemperature(below
-20°C) created by the sub-cooled ice that is
stagingabovetheice level, which will preventa
positive function of the ice level thermostatic
control, the thermostatic sensing bulb must be
removed from the storage room.
The MAR ice system are also equipped with a
timer which allows to present the system
operationstimeinrelation tothequantity(level)
of the ice desired. This timer function takes
place of the ice level control.
8. ICE CHUTE
Mar compact unit are supplied with its own ice
chute. In addition optional kits for various
solutions are available on request.
9. FINAL CHECK LIST
1. Is the cabinet level 3 (IMPORTANT).
2. Have all electrical and piping connections
been made?
3. Has the voltage been tested and checked
against the nameplate rating?
4. Isthewatersupplylineshut-offvalveinstalled
and electrical wiring properly connected?
5. HavetheBinandCabinetbennwipedclean?
6. Have the compressor hold down bolts been
encheckedtobe surethecompressorisfloating
on the mounting springs?
7. Has the owner/user been instructed on how
to operate the ice maker?
8. Has the Manufacturer's Registration Card
beenproperlyfilledout?CheckforcorrectModel
and Serial numbers from serial nameplate then
mailthecompletedcardtotheFrimont Scotsman
Europe Factory.
9. Check all refrigerant lines and conduit lines,
toguardagainstvibrationorruggingandpossible
failure.
10. Is the cabinet in a room where ambient
temperatures are a minimum of 5°C (40°F) all
year around?
11. Has water supply pressure been checked to
insure a minimum of 1 bar (14 psi) and max of 5
bar (70 psi)?
12. Has the owner been given name and
telephonenumberoftheauthorizedSCOTSMAN
Service Agency serving him?
1 Power supply line
2 Hand disconnect switch
3 Water supply line
4 hand shut off valve
5 Water filter
6 Water supply in.
(Run separate water inlet
for condenser)
7 Water drain line
8 Open trapped or vented drain
10. UNIT INSTALLATION PRACTICE ON NON-REFRIGERATED ICE-ROOM
Page 15

Page 16
Page 16
11. UNIT INSTALLATION PRACTICE ON REFRIGERATED ICE STORAGE ROOM
(Jacket system)
1 Power supply line
2 Hand disconnect switch
3 Water supply line
4 Hand shut off valve
5 Water filter
6 Water supply in.
(Run separate water inlet
for condenser)
7 Water drain line
8 Open trapped or vented drain
9 REFRIGERANT COIL
10 Insulated panel
11 Air gap
12 Ice bulkhead

Page 17
Page 18
SEZIONE II
OPERATING INSTRUCTION
1. COMPLETE UNIT START-UP
1. Removeallpanelsandopenthewatersupply
line shut-off valve for both the evaporator
drum and in the case of a water cooled
machine, to the condenser.
2. 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 halfof freezing
drum.
3. Move the manual ON-OFF toggle of main
disconnect switch to ON position. The green
light on console panel will glow.
4. MAR uses an electrical "three phases
monitoringrelay"whichalertsinstallerincase
of wrong wiring by keeping green LED ON
only. In this case change phase connection
wiring.
5. Correct wiring is shown by both LEDs Green
and Orange steady ON together.
6. Observe immediately that evaporator drum
rotates in the right direction, namely toward
the scraping blade.
7. Meanwhile unit is under power KT1 relay
compressor device is energized as well in
ordertodelaycompressorstartupby18'Later
(KT1orangeLEDblinksduringthisdelay).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
unitstopsbyonlykeepingdrivemotoroperating
for 18' in order to clear evaporator by ice.
KT2 delay relay LEDs steady ON (orange
and green) during this delay.
WARNING - Correct Drum rotation - The
evaporator drum drive motor is a
threephase motor wired for 400 V. It is of
extremeimportancetocheckimmediately
upon unit start-up that motor rotates
CLOCKWISE in order that gear motor
pulley rotates in the direction of the
ARROW. Should the motor turn
counterclockwise, it is necessary to
instantly switch-off the unit and
interchangeonepolarityatterminalblock
connection of main electric cord.

Page 19
Page 18
Motor Shaft Pulley
MAR units are generally equipped with two
pulleys (not on MAR 126) and by changing
from one to the other the speed of drum can
be changed.
MAR Machines are factory delivered with
pulley to rotate the evaporator drum at the
lowest possible R.P.M. to obtain "THICK"
(2 mm gauge) scale ice. Replacing standard
by alternative/supplied pulley on motor shaft
evaporatordrumR.P.M.increasestothepoint
to produce "THIN" (1 mm gauge) scale ice.
8. Makesurethattheautomaticexpansionvalve
opens and that refrigerant fluid starts to flow
through it.
NOTE.Atfirstcompressorstart-up,thesuction
pressure declines rapidly to 0.2 bar, causing
theinterventionofthepressurecontrol,which
will interrupt the entire unit operation. This
control being automatic re-set type, will
resumetheunit operation afterfew seconds.
The unit will start and stop few more times,
due to the lo-pressure control cut-out and in,
until system refrigerant pressure set on their
normal values.
9. Aftertwoorthreeminutesofoperation,observe
that ice skin begin to form on the revolving
drum surface and it is scraped by the blade.
10.Left thesystemoperateforabout20minutes.
Check for any excess noise beyond normal
compressor noise.
a) Vibrating type from touching lines.
b) Compressor loose at one or more holddown
bolts.
c) Drivemotor pulley misaligned with gear box
pulley causing V belt vibration.
d) Check compressor oil level through sight
glass (Except MAR 56/76/106/126).
11.On water cooled machine check the water
flowing out from condenser to see if it is
correct. Cooling water flow is controlled by a
pressure water regulating valve. No valve
adjustment of water valve should be
necessary unless the inlet temperature of
coolingwateris relatively high. Normalhead
pressureshould be 17bar on MAR56, MAR
76,MAR106and MAR126;16baron MAR
206 and 14 bar on MAR 306.
12.Observe that evaporator drum is frosted all-
over from end to end. If this is not the case
setting of the refrigerant expansion valve
maybenecessary.Forproperadjustment of
thisvalveturnthevalve setting steam of one
eight of a turn counterckwise to allow more
refrigerant flow until the evaporator drum
surface is evenly frosted from end to end.
In case you have an excessive frost back in
the suction line and frost starts to form on
compressor suction service valve slightly
turn clockwise the expansion valve setting
stem until the frost back on compressor
service valve melts over.
The suction pressure should range
between0.6barand2.5bardependingon
model, water temperature and level.
See indications on page 25.
2. WATER AND REFRIGERANT CIRCUIT
1. Compressor
2. Condenser
3. Discharge line
4. Drier
5. Liquid line
6. Heat exchanger
13. Drum water basin
14. Evaporator drum
15. Refrig. lines manifold.
16. Scraping blade
17. Float reservoir
18. Spray bar
7. Expansion valve
8. Vapor line
9. Vibration absorbers
10. Condensing water-inlet
11. Condensing water-outlet
12. Water regulating valve

Page 19
Page 20
WARNING - Whenever stopping the
machine to keep it off operation for some
time, it is recommendable to shut close
thewaterinletvalvetointerruptthewater
supply.
13. Throughly explain the owner/user the
significant specifications of the MAR ice
maker, the start-up and operation, going
through the procedure in the operating
instructions. Answer all questions about the
icemaker,bytheownerandinformtheowner
of the name and telephone number of the
Scotsman Service station serving him.
14. Fit and secure all unit panels previously
removed.

Page 21
Page 20
SECTION III
PRINCIPLES OF OPERATION - HOW IT WORKS
1. ICE MAKER
Therevolvingdrumwhichmaybeofdifferentsize
dependingontheicemakercapacity,isbasically
madeofacylinderskeletoncoveredbyastainless
steel jacket.
Achannel, about 15m/m deep and15 m/m wide
ismachinedinaspiralpatternthatgoesfromone
end to the other of the cylinder skeleton.
The end of the machined channel communicate
with a bore made in the left cylinder journal. The
head manifold on the left side is for both liquid
refrigerant inlet and vapor refrigerant outlet.
When cylinder metal jacket is forced and sealed
onthecylinderskeleton,thespiralpatternchannel
made for the refrigerant flow becomes virtually
the evaporator serpentine.
The metered refrigerant that reaches the
evaporator serpentine by passing throught the
bore in the left side cylinder journal, boils and
evaporatoresasitcomesincontactwiththedrum
metaljacket.Aboutonethirdonthecylinderdrum
is constantly submerged in water.
Thiswill allow the cylinder metaljacket to drawa
film of water that, as soon as it comes afloat,
freezesalmostinstantlyduetotheheatabsorption
createdbytheboilingrefrigerantcirculatinginthe
inner serpentine and scrubbing with the jacket
inner surface.
2. PRINCIPLES OF OPERATION - HOW IT WORKS
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 peels off of the ice sheet formed on the drum
jacket by racking it while it advances on the
revolving drum.
Theicesheetissodrythat,whenitgetsincontact
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 bore of
the head manifold on the left side cylinder.
Therefrigerantsealinginthemanifoldisassured
by an especially designed sealing device.
The cylinder is driven by a separate drive motor
and gear reducer located on the right side.
Four motors are constantly in motion:
a) the compressor
b) the drive motor
c) the fan motor
d) water pump
The gear reducer, the driving belt with its pulley
and the revolving drum with the rotating part of
the sealing devices are the mechanical parts in
motion.
1. Water drawing area
2. Water sprayed freezing cooling area
3. Sub-cooling area
4. Water reservoir float valve
5. Water feeding line
6. Scraping blade
7. Spray bar
8. Water reservoir
9. Revolving drum
10. Water pump
11. Water drain hole