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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
MC 46
Electronic
modular cubers
New PC Board
From s.n. 28850
REV. 09/2015
SERVICE MANUAL
Page 2
LED STATUS
REASON WHY - SIGNIFICATION - SIGNIFICATO
ON STEADY
FIXE
FISSO
FREEZING CYCLE
EN RÉFRIGÉRATION
IN CONGELAMENTO
BLINKING
CLIGNOTANT
LAMPEGGIANTE
60 MINUTES DELAY AT START UP JUMPER J3 OUT
60 MINUTES DE RETARD AU DEMARRAGE - CAVALIER J3 OUVERTE
60 MINUTI RITARDO PARTENZA - CONTATTI J3 APERTI
ON STEADY
FIXE
FISSO
TOO HI DISCHARGE PRESSURE/TEMP.
COUPURE HP
FERMATA ALTA TEMP. CONDENSAZIONE
BLINKING
CLIGNOTANT
LAMPEGGIANTE
TOO HI EVAP. TEMP. (> 0°C) AFTER 15’ FROM START UP
COUPURE BP ( > 0°C LU PAR LA
SONDE EVAP. NON ATTEINTE APRES 15’ FONCT.)
TEMP. EVAP. > 0°C DOPO 15’ DA INIZIO CONGELAMENTO
ON STEADY
FIXE
FISSO
UNIT OFF AT BIN FULL
CABINE PLEINE
CONTENITORE PIENO
BLINKING SLOW
CLIGNOTANT LENT
LAMPEGG. LENTO
I/R BEAM CUTTED
FAISCEAU INFRA ROUGE CELLULE NIVEAU GLACE INTERROMPU
RAGGIO INFRAROSSO INTERROTTO
BLINKING FAST
CLIGNOTANT RAPIDE
LAMPEGG. VELOCE
I/R ON AFTER TRIP OFF AT BIN FULL
FAISCEAU INFRA ROUGE CELLULE NIVEAU GLACE ETABLI
RAGGIO INFRAROSSO RIPRISTINATO DOPO FERMATA A CONT. PIENO
ON STEADY
FIXE
FISSO
I/R CALIBRATION DONE
CALIBRATION FAISCEAU INFRA ROUGE CELL. NIVEAU GLACE REALISÉ
CALIBRAZIONE RAGGIO INFRAROSSO EFFETTUATA
BLINKING
CLIGNOTANT
LAMPEGGIANTE
UNIT IN CLEANING MODE OR TRIPPING OFF AFTER TEST - JUMPER TEST IN
MACHINE EN MODE DETARTRAGE OU ARRÊTE APRES LE TEST - CAVALIER TEST FERMÉ
MACCHINA NELLA FASE LAVAGGIO O FERMA DOPO IL TEST - PONTICELLO TEST CHIUSO
ON STEADY
FIXE
FISSO
CONDENSER SENSOR OUT OF ORDER
SONDE CONDENSEUR HS
SONDA CONDENSATORE MALFUNZIONANTE
BLINKING
CLIGNOTANT
LAMPEGGIANTE
EVAPORATOR SENSOR OUT OF ORDER
SONDE EVAPORATEURS HS
SONDA EVAPORATORE MALFUNZIONANTE
BLINKING ALTERNATIV.
CLIGNOTANT ALTERNÉ
LAMPEGGIO ALTERN.
I/R SENSOR OUT OF ORDER
SONDE INFRA ROUGE CELLULE NIVEAU GLACE HS
SONDA ALL’INFRAROSSO LIVELLO GHIACCIO MALFUNZIONANTE
PUSH
PUSH > 5” DURING WATER FILLING TO MOVE THE UNIT INTO FREEZING
PUSH > 5” DURING FREEZING TO MOVE THE UNIT INTO DEFROST
PUSH > 5” DURING DEFROST TO MOVE THE UNIT INTO FREEZING
PUSH 2” ÷ 5” DURING WATER FILLING TO MOVE THE UNIT INTO CLEANING
PUSH DURING THE 60 MIN START UP DELAY TIME TO BY-PASS IT
START
AMPS
MC 16 SHORT A - 230 V
MC 16 SHORT W - 230 V
MC 16 SHORT A - 400 V
MC 16 SHORT W - 400 V
MC 46 A - 230 V
MC 46 W - 230 V
MC 46 A - 400 V
MC 46 W - 400 V
MC 1210 A - 400 V
MC 1210 W - 400 V
AMPS WATTS
KWH/24HRS
REFR. CHARGE
R404a
SUCT. PRESS.
END. FREEZE
DISCHARGE
PRESSURE
7,1
3
10
5,5
11
32
18
66
14
28
1300
1400
2400
4800
580 gr
450 gr
580 gr
450 gr
1300 gr
700 gr
1300 gr
700 gr
2 x 1300 gr
2 x 700 gr
1,6 ÷ 1,7 bar
1,6 ÷ 1,7 bar
2,5 bar
16 ÷ 18 bar
17 bar
16 ÷ 18 bar
17 bar
16 ÷ 18 bar
17 bar
16 ÷ 18 bar
17 bar
13 ÷ 14 bar
13,5 ÷ 14,5 bar
14 bar
1 2 3 4
MCS 16 A
MCS 16 W
MCM 16 A
MCM 16 W
MCL 16 A
MCL 16 W
MCS 46 A
MCS 46 W
MCM 46-1210 A
MCM 46-1210 W
MCL 46-1210 A
MCL 46-1210 W
MCXL 46 W
5 6 7 8 9
10
ON
ON
OFF
OFF
OFF
OFF
ON
ON
ON
OFF
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
ON
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON
OFF
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
OFF
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
OFF
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
OFF
DIP SWITCH FACTORY SETTING COMBINATIONS (PER MODEL AND VERSION)
COMBINAISON DES COMMUTATEURS NUMERIQUES DU DIP SWITCH POUR MODELES ET VERSIONS
REGOLAZIONE TASTI DIP SWITCH PER MODELLO E VERSIONE
DIP SWITCH
FREEZING CYCLE
CYCLE DE CONGÉLATION
CICLO CONGELAMENTO
DEFROST CYCLE
CYCLE DE DÉMOULAGE
CICLO SBRINAMENTO
15/30"
1 2 3 4
ON ON ON ON 1 min.
OFF ON ON ON 3 min.
ON OFF ON ON 5 min.
OFF OFF ON ON 7 min.
ON ON OFF ON 9 min.
OFF ON OFF ON 11 min.
ON OFF OFF ON 13 min.
OFF OFF OFF ON 15 min.
ON ON ON OFF 17 min.
OFF ON ON OFF 19 min.
ON OFF ON OFF 21 min.
OFF OFF ON OFF 23 min.
ON ON OFF OFF 25 min.
TIMED PORTION FREEZING CYCLE
TEMPS PHASE TEMPORISÉE CONGELATION
TEMPI FASE TEMPORIZZATA CONGELAMENTO
7 8
OFF OFF
WATER PUMP OFF DURING DEFROST
POMPE A L’ARRÊT PEND. DEGIVRAGE
POMPA ACQUA DURANTE SBRINAMENTO
7 8
ON ON 0
OFF ON 30 sec.
ON OFF 60 sec.
ADDITIONAL DEFROST TIME
TEMPS AJOUTÉS
TEMPI AGG. SCONGELAMENTO
AIR/EAU
ARIA/ACQUA
27,6
28,0
50
105
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TABLE OF
CONTENTS
Table of contents
Specifications MC 46
GENERAL INFORMATION AND INSTALLATION
Introduction
Unpacking and Inspection - Ice maker
Unpacking and Inspection - Storage bin
Location and levelling
Stacking installation
Electrical connections
Water supply and drain connections
Final check list
Installation practice
OPERATING INSTRUCTIONS
Start up
Operatiobnal checks
OPERATING PRINCIPLES (How it works)
Freezing cycle
Harvest cycle
Control sequence
Component description
ADJUSTMENT, REMOVAL AND REPLACEMENT PROCEDURES
Adjustment of the cube size
Wiring diagram
Service diagnosis
MAINTENANCE AND CLEANING INSTRUCTIONS
General
Icemaker
Cleaning instructions of water system
2
3
15
17
18
19
24
25-26-27
28
30
30
31
10
11
5
5
5
5
6
8
8
8
9
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Page 3
310
300
290
280
270
260
250
240
230
220
210
200
190
180
Kg.
32
10 °C27 21 15
MODÈLES REFROIDIS PAR AIR
TEMPÉRATURE DE L'EAU
TEMPÉRATURE AMBIANTE
PRODUCTION DE GLACE EN 24 H
32
38
10
21
°C
MODÈLES REFROIDIS PAR EAU
310
300
290
280
270
260
250
240
230
220
210
200
190
180
Kg.
32
10 °C27 21 15
TEMPÉRATURE DE L'EAU
TEMPÉRATURE AMBIANTE
PRODUCTION DE GLACE EN 24 H
10
21
32
38
°C
ice making capacity
AIR COOLED MODELS
AMBIENT TEMPERATURE
WATER TEMPERATURE
ICE PRODUCED PER 24 HRS
AMBIENT TEMPERATURE
WATER TEMPERATURE
ICE PRODUCED PER 24 HRS
WATER COOLED MODELS
SPECIFICATIONS
ELECTRONIC CUBER MODEL MC 46
I
mportant operating requirements:
MIN.
Air temperature 10°C (50°F)
Water temperature 5°C (40°C)
Water pressure 1 bar (14 psi)
Electr. voltage variations
from voltage rating
specified on nameplate -10%
MAX.
40°C (100°F)
35°C (90°F)
5 bars (70 psi)
+10%
NOTE. The daily ice-making capacity is directly related to the condenser air inlet temperature, water
temperature and age of the machine.
To keep your SCOTSMAN MODULAR CUBER at peak performance levels, periodic maintenance
checks must be carried out as indicated on maintenance section of this manual.
Production charts shown are indicating the production of MCM and MCL models. For MCS models
ice production is approx. 10% lower.
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MC 46 AS 6 Air Stainless steel
MC 46 WS 6 Water Stainless steel
2.5
Model Cond. unit Finish Comp. HP Water req. - lt/24 HR
SPECIFICATIONS
660
3700*
MC 46 - MACHINE SPECIFICATIONS
DIMENSIONS:
HEIGHT 874 mm.
WIDTH 1074 mm.
DEPTH 534 mm.
WEIGHT 185 Kgs.
ACCESSORIES
KSC 11: Cube stacking kit
220-230/50/1 7 2400 50 3 x
Basic electr. Amps Watts N. of wires Amps. fuse
230/50/1N 10 66 3 x 1.5 m/m
2
20
400/50/3N 5.5 14 5 x 1.5 m/m
2
10
Starts Electric power cons.
amps. Kwh x 24 HR
Cubes per harvest: MCL-46 144 large - MCM-46 204 medium - MCS 46 396 small
* At 15°C (60°F) water temperature
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A. INTRODUCTION
This manual provides the specifications and the
step-by-step procedures for the installation, startup and operation, maintenance and cleaning for
the SCOTSMAN MODULAR CUBERS.
The Electronic Modular Cubers are quality
designed, engineered and manufactured.
Their ice making systems are thoroughly tested
providing the utmost in flexibility to fit the needs
of a particular user.
These icemakers have been engineered to our
own rigid safety and performence standards.
NOTE. To retain the safety and performance
built into this icemaker, it is important that
installation and maintenance be conducted
in the manner outlined in this manual.
Storage Bin
Since the MC series Modular Cubers do not
have their own attached ice storage bins, it is
necessary to use an auxiliary bin such as the Bin
SB 550.
B. UNPACKING AND INSPECTION
Modular Cuber
1. Call your authorized SCOTSMAN Distributor
or Dealer for proper installation.
2. Visually inspect the exterior of the packing
and skid. Any severe damage noted should be
reported to the delivering carrier and a concealed
damage claim form filled in subjet to inspection
of the contents with the carrier’s representative
present.
3. a) Cut and remove the plastic strip securing
the carton box to the skid.
b) Remove the packing nails securing the
carton box to the skid.
c) Cut open the top of the carton and remove
the polystyre protection sheet.
d) Pull out the polystyre posts from the
corners and then remove the carton.
4. Remove top and sides panels of the unit
and inspect for any concealed damage. Notify
carrier of your claim for the concealed damage
as stated in step 2 above.
5. Loose two nuts on left and rights side of the
unit base and remove it from the skid. Save the
two bolts and nuts to mount the machine on
storage bin or on top of another Modular Cuber.
GENERAL INFORMATION AND INSTALLATION
6. Remove all internal support packing and
masking tape and the hardware package.
7. Check that refrigerant lines do not rub
against or touch other lines or surfaces, and that
the fan blade moveS freely.
8. Check that the compressor fits snugly onto
all its mounting pads.
9. See data plate on the rear side of the unit
and check that local main voltage corresponds
with the voltage specified on it.
CAUTION. Incorrect voltage supplied to
the icemaker will void your parts
replacement program.
10. Remove the manufacturer’s registration
card from the inside of the User Manual and fillin all parts including: Model and Serial Number
taken from the data plate.
Forward the completed self-addressed
registration card to Frimont/Scotsman Europe
factory.
C. LOCATION AND LEVELLING
WARNING. This Ice Cuber is designed
for indoor installation only. Extended
periods of operation at temperature
exceeding the following limitations will
constitute misuse under the terms of
the SCOTSMAN Manufacturer’s Limited
Warranty resulting in LOSS of warranty
coverage.
1. Position the Bin in the selected permanent
location. Criteria for selection of location include:
a) Minimum room temperature 10°C (50°F)
and maximum room temperature 40°C (100°F).
b) Water inlet temperatures: minimum 5°C
(40°F) and maximum 35°C (90°F).
c) Well ventilated location for air cooled
models.
d) Service access: adequate space must
be left for all service connections through the
rear of the ice maker. A minimum clearance of 15
cm (6") must be left at the sides of the unit for
routing cooling air drawn into and exhausted out
of the compartment to maintain proper
condensing operation of air cooled models.
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2. Level the Storage Bin Assy in both the left
to right and front to rear directions by means of
the adjustable legs.
3. Inspect the Storage Bin top mounting gasket
which should be flat with no wrinkles, to provide
a good sealing when the Modular Cuber is
installed on top of it.
4. Place the Modular Cuber on top of
Storage bin using care not to wrinkle or tear
the gasket.
5. Lift a little bit the Modular Cuber right side in
order to be able to mount the ice level control
bracket taking care to align the hole located on
unit base to mate with the one on the top of the
Bin.
6. Remove the PVC plastic plug closing the
round hole located on the right side of the ice
chute opening.
7. Trace the ice level control assy, secured for
the transport on top of the evaporator of the
Modular Cuber, and direct it down through the
round hole into the Storage Bin.
8. Fasten the ice level control assy on its
bracket by means of the two screws found in the
hardware package supplied with the unit.
9. Make a cut (shear) in the PVC plastic plug
that goes from its edge to the center; insert the
ice level control cable in the center of the plastic
plug so to prevent it from any sort of contact with
the unit frame, then place again the PVC plug in
the round hole keeping the cable exceeding
portion inside the unit.
10. Install the plastic ice cube deflector by
hooking it on the flange of the ice chute opening
in unit base (see illustration).
11. Secure the Modular Cuber on the top of the
Storage Bin using the two bolts and diber washer
found in the hardware package supplied with the
unit.
D. STACKING INSTALLATION
A Stacking Kit KSC 11 is available as an accessory
on request to allow the installation of two Modular
Cubers one on top of the other.
The Stacking Kit is consisting of:
a) unit base gasket
b) plastic reinforced ice chute
connections
Use the ice chute connections supplied in the
KSC Kits..........
... to connect the ice chute of the bottom machine
with the one of the top machine
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E. ELECTRICAL CONNECTIONS
See data plate for current requirements to
determine wire size to be used for electrical
connections. All SCOTSMAN icemakers require
a solid earth wire.
All SCOTSMAN ice machines are supplied from
the factory completely pre-wired and require only
electrical power connections to the wire cord
provided at the rear of the unit.
Make sure that the ice machine is connected to
its own circuit and individually fused (see data
plate for fuse size).
The maximum allowable voltage variation should
not exceed -10% and +10% of the data plate
rating. Low voltage can cause faulty functioning
and may be responsible for serious damage to
the overload switch and motor windings.
NOTE. All external wiring should conform to
national, state and local standards and
regulations.
Check voltage on the line and the ice maker’s
data plate before connecting the unit.
F. WATER SUPPLY AND DRAIN
CONNECTIONS
General
When choosing the water supply for the ice flaker
consideration should be given to:
a) Length of run
b) Water clarity and purity
c) Adequate water supply pressure
Since water is the most important single ingredient
in producting ice you cannot emphasize too
much the three items listed above.
Low water pressure, below 1 bar may cause
malfunction of the ice maker unit.
Water containing excessive minerals will tend to
produce cloudy coloured ice cubes, plus scale
build-up on parts of the water system.
Water supply
Connect the 3/4" GAS male fitting of the solenoid
water inlet valve, using flexible tubing or a 3/8"
O.D. copper pipe, to the cold water supply line
with regular plumbing fitting and a shut-off valve
installed in an accessible position between the
water supply line and the unit.
Water supply - Water cooled models
The water cooled versions of SCOTSMAN Ice
Makers require two separate inlet water supplies,
one for the water sprayed for making the ice
cubes and the other for the water cooled
condenser.
Connect the 3/4" GAS male fitting of the water
inlet, using the flexible tubing or a 3/8" O.D.
copper pipe, to the cold water supply line with
regular plumbing fitting and a shut-off valve
installed in an accessible position between the
water supply line and the unit.
Water drain
The recommended drain tube is a plastic or
flexible tube with 18 mm (3/4") I.D. which runs to
an open trapped and vented drain. When the
drain is a long run, allow 3 cm pitch per meter
(1/4" pitch per foot).
A vent at the unit drain connection is also required
for proper sump drainage.
Water drain - Water cooled models
Connect the 3/4" GAS male fitting of the
condenser water drain, utilizing a second flexible
tubing or a 3/8" O.D. copper tubing, to the open
trapped and vented drain.
NOTE. The water supply and the water drain
must be installed to conform with the local
code. In some case a licensed plumber and/
or a plumbing permit is required.
G. FINAL CHECK LIST
1. Is the unit in a room where ambient
temperatures are within a minimum of 10°C
(50°F) even in winter months?
2. Is there at least a 15 cm (6") clearance
around the unit for proper air circulation?
3. Is the unit level? (IMPORTANT)
4. Have all the electrical and plumbing
connections been made, and is the water supply
shut-off valve open?
5. Has the voltage been tested and checked
against the data plate rating?
6. Has the water supply pressure been
checked to ensure a water pressure of at least 1
bar (14 psi).
7. Have the bolts holding the compressor down
been checked to ensure that the compressor is
snugly fitted onto the mounting pads?
8. Check all refrigerant lines and conduit lines
to guard against vibrations and possible failure.
9. Have the bin liner and cabinet been wiped
clean?
10. Has the owner/user been given the User
Manual and been instructed on the importance of
periodic maintenance checks?
11. Has the Manufacturer’s registration card
been filled in properly? Check for correct model
and serial number against the serial plate and
mail the registration card to the factory.
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H. INSTALLATION PRACTICE
1. Hand shut-off valve
2. Water filter
3. Water supply line (flexible hose)
4. 3/4" gas male fitting
5. Power line
6. Main switch
7/9. Drain fitting
8/10. Vented drain line
11. Open trapped vented drain
WARNING. This icemaker is not designed for outdoor installation and will not function in
ambient temperatures below 10°C (50°F) or above 40°C (100°F).
This icemaker will malfunction with water temperatures below 5°C (40°F) or above 35°C
(90°F).
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OPERATING INSTRUCTIONS
NOTE.
Ice maker pcb is equipped by jumper
cleaning reminding setting (see pag. 20)
suitable to alert users after certain time of unit
operation. This would advice for preventive
maintenance.
This time can be adjusted for 6 or 12 months
operation (upon installer advice related to
installation site water and ambient condition);
once selected time is elapsed RED front panel
lamp blinks slowly and ice maker will keep on
working anyway.
Pcb is also equipped by 3 (standard) or 60
(machines operating at 400/50/3) minutes
jumper setting start up delay (see pag. 20).
In case of pcb setting to 60 minutes ice maker
doesn't start until this time is elapsed. After
having correctly installed the ice maker and
completed the plumbing and electrical
connections, perform the following “Start-up”
procedure.
START UP
After having correctly installed the ice maker and
completed the plumbing and electrical
connections, perform the following “Start-up” procedure.
A. Give power to the unit to start it up by
switching "ON" the power line main disconnect
switch.
NOTE.
Every time the unit returns under
power, after having been switched off, the
water inlet valve, the hot gas valve and the
water drain valve get energized for a period
of 5 minutes, thus to admit new water to the
machine sump reservoir to fill it up and,
eventually, to wash-off any dirt that can have
deposited in it during the unit off period
(Fig.1).
B. During the water filling operation, check to
see that the incoming water dribbles, through the
evaporator platen dribbler holes, down into the
sump reservoir to fill it up and also that the
incoming surplus of water flows out through the
overflow pipe into the drain line.
During the water filling phase the components
energized are:
THE WATER INLET SOLENOID VALVE
THE HOT GAS SOLENOID VALVE
THE WATER DRAIN SOLENOID VALVE/S
for the first 30 seconds.
16
15
14
13
2
1
7
8
9
10
3
4
5
6
11
12
Rx Tx
WATER IN VALVE
HOT GAS VALVE
CONTACTOR COIL
FAN MOTOR
WATER PUMP
- EVAPORATOR
- AMBIENT
- CONDENSER
TEMPERATURE SENSORSBINCOMPRESSOR
TRANSF.
DATA
PROCESSOR
ELECTR.
TIMER
DIP
SWITCH
ELECTRONIC CARD
L
N
RELAYS
RELAY
TRIAC
WATER DRAIN VALVE
FIG. 1
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Page 11
NOTE
. If in the 5 minutes length of the water
filling phase the machine sump reservoir
does not get filled with water up to the rim of
the overflow pipe, it is advisable to check:
1.The water pressure of the water supply line
that must be at least 1 bar (14 psig) Minimum
(Max 5 bar-70 psig).
2.The filtering device installed in the water
line that may reduce the water pressure below
the Minimum value of 1 bar (14 psig).
3. Any clogging situation in the water circuit
like the inlet water strainer and/or the flow
control.
C. At completion of the water filling phase (5
minutes) the unit passes automatically into the
freezing cycle with the start up of:
COMPRESSOR
WATER PUMP
FAN MOTOR/S (in air cooled version) controlled
by the condensing temperature sensor located
within the condenser fins (Fig.2).
OPERATIONAL CHECKS
D. If necessary install the refrigerant service
gauges on both the high side and low side
Schräder valves to check the compressor head
and suction pressures.
NOTE.
On air cooled models the condenser
temperature sensor, which is located within
the condenser fins, keep the head
(condensing) pressure between 16 and 18
bars (225-250 psig).
In the water cooled models the discharge
pressure is kept constant at the value of 17
bars (240 psig) by means of a water regulating
valve located on the water supply line to the
condenser.
In case of condenser clogging such to prevent
the proper flow of the cooling air or, in case
the fan motor is out of operation or shortage
of water in the water cooled condenser, the
condenser temperature rises and when it
reaches 70°C (160°F) - for air cooled version
- or 60°C (140°F) - for water cooled version the condenser temperature sensor shuts-off
the ice maker with the consequent light-up of
the RED WARNING LED (Fig.3).
After having diagnosed the reason of the rise
of temperature and removed its cause, it is
necessary to unplug (wait few seconds) and
plug in again the unit, thus to put the machine
in condition to initiate a new freezing cycle.
The machine restarts with the usual 5 minutes
water filling phase in order to provide enough
water into the sump tank.
16
15
14
13
2
1
7
8
9
10
3
4
5
6
11
12
Rx Tx
WATER IN VALVE
HOT GAS VALVE
CONTACTOR COIL
FAN MOTOR
WATER PUMP
- EVAPORATOR
- AMBIENT
- CONDENSER
TEMPERATURE SENSORSBINCOMPRESSOR
TRANSF.
DATA
PROCESSOR
ELECTR.
TIMER
DIP
SWITCH
ELECTRONIC CARD
L
N
RELAYS
RELAY
TRIAC
WATER DRAIN VALVE
FIG. 2
Page 13
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E. Check to see through the ice discharge
opening that the self propeller spray bar is
correctly rotating and that the water jets uniformely
reach the interior of the inverted mold cups and
there is not excessive water spilling through it.
F. The ice making process takes place thereby,
with the water sprayed into the molds that gets
gradually refrigerated by the heat exchange with
the refrigerant flowing into the evaporator
serpentine.
16
15
14
13
2
1
7
8
9
10
3
4
5
6
11
12
Rx Tx
WATER IN VALVE
HOT GAS VALVE
CONTACTOR COIL
FAN MOTOR
WATER PUMP
- EVAPORATOR
- AMBIENT
- CONDENSER
TEMPERATURE SENSORSBINCOMPRESSOR
TRANSF.
DATA
PROCESSOR
ELECTR.
TIMER
DIP
SWITCH
ELECTRONIC CARD
L
N
RELAYS
RELAY
TRIAC
WATER DRAIN VALVE
FIG. 4
16
15
14
13
2
1
7
8
9
10
3
4
5
6
11
12
Rx Tx
WATER IN VALVE
HOT GAS VALVE
CONTACTOR COIL
FAN MOTOR
WATER PUMP
- EVAPORATOR
- AMBIENT
- CONDENSER
TEMPERATURE SENSORSBINCOMPRESSOR
TRANSF.
DATA
PROCESSOR
ELECTR.
TIMER
DIP
SWITCH
ELECTRONIC CARD
L
N
RELAYS
RELAY
TRIAC
WATER DRAIN VALVE
FIG. 3
Page 14
Page 13
Page 13
16
15
14
13
2
1
7
8
9
10
3
4
5
6
11
12
Rx Tx
WATER IN VALVE
HOT GAS VALVE
CONTACTOR COIL
FAN MOTOR
WATER PUMP
- EVAPORATOR
- AMBIENT
- CONDENSER
TEMPERATURE SENSORSBINCOMPRESSOR
TRANSF.
DATA
PROCESSOR
ELECTR.
TIMER
DIP
SWITCH
ELECTRONIC CARD
L
N
RELAYS
RELAY
TRIAC
WATER DRAIN VALVE
FIG. 5
During the freezing process, when the evaporator
temperature falls below an established value, to
the evaporator temperature sensor supplies a
low voltage power signal to the electronic control
device (P.C.BOARD) in order to activate an
electronic timer.
This one takes over the control of the freezing
cycle up to the complete formation of the ice
cubes (Fig.4).
NOTE.
The length of the entire freezing cycle
is governed by the evaporator temperature
sensor which has its brobe placed in contact
with the evaporator serpentine (Non
adjustable) in combination with the electronic
timer (Adjustable) incorporated in the P.C.
BOARD).
The timer adjustment is factory set in
consideration of the ice maker model, cooling
version and ice cube size (Small, Medium,
Large).
It is possible, however, to modify the timed
length of the freezing cycle, by changing the
DIP SWITCH keys setting.
In Table B of PRINCIPLE OF OPERATION
are shown the various time extensions of the
freezing cycle second phase, in relation with
the different DIP SWITCH keys settings.
G. After about 17-20 minutes from the
beginning of the freezing cycle, in an hypothetic
ambient temperature of 21°C , the defrost cycle
takes place with the hot gas and the water inlet
valves being simoultaneously activated (Fig.5).
The electrical components in operation are:
COMPRESSOR
WATER PUMP
WATER INLET SOLENOID VALVE
HOT GAS VALVE
WATER DRAIN SOLENOID VALVE/S
for the first 30 seconds.
NOTE. The length of the defrost cycle is
related to the length of the second phase of
freezing cycle T2. (Time to drop the
evaporating temperature from 0°C (32°F) small Red LED blinking-to-15°C (5°F) small
Red LED ON steady.
It is possible to extend the length of the defrost
cycle by changing the setting of DIP SWITCH
7 and 8 as shown on table at page 24.
H. Check, during the defrost cycle, that the
incoming water flows correctly into sump reservoir
in order to refill it and that the surplus overflows
through the overflow drain tube.
Page 15
Page 14
Page 14
16
15
14
13
2
1
7
8
9
10
3
4
5
6
11
12
Rx Tx
WATER IN VALVE
HOT GAS VALVE
CONTACTOR COIL
FAN MOTOR
WATER PUMP
- EVAPORATOR
- AMBIENT
- CONDENSER
TEMPERATURE SENSORSBINCOMPRESSOR
TRANSF.
DATA
PROCESSOR
ELECTR.
TIMER
DIP
SWITCH
ELECTRONIC CARD
L
N
RELAYS
RELAY
TRIAC
WATER DRAIN VALVE
FIG. 6
I. Check the texture of ice cubes just released.
They have to be in the right shape with a small
depression of about 5-6 mm in their crown.
If not, wait for the completion of the second cycle
before performing any adjustment.
If required, the length of the timed freezing cycle
can be modified by changing the DIP SWITCH
keys setting as illustrated in OPERATING
PRINCIPLE.
If the ice cubes are shallow and cloudy, it is
possible that the ice maker runs short of water
during the freezing cycle second phase or, the
quality of the supplied water requires the use of
an appropriate water filter or conditioner.
J. To be sure of the correct operation of ice
level control device, place one hand between its
sensing “eyes” to interrupt the light beam.
The Bin Full YELLOW LED starts to blink, and
after 60 seconds, the unit stops with the
simultaneous glowing of the same LED to monitor the BIN FULL situation (Fig.6).
Take the hand out from the ice level control
sensors to allow the resumption of the light
beam. The BIN FULL YELLOW LED blinks fast
and after approximately 6 seconds the ice maker
resume its operation with the immediate glowing
of the FIRST YELLOW LED indicating UNIT IN
OPERATION and the extinguishing of the “BIN
FULL” YELLOW LED.
NOTE. The ICE LEVEL CONTROL
(INFRARED SYSTEM) is independent of the
temperature however, the reliability of its
detection can be affected by external light
radiations or by any sort of dirt and scale
sediment which may deposit directly on the
light source and on the receiver.To prevent
any possible ice maker malfunction, due to
negative affection of the light detector, it is
advisable to locate the unit where it is not
reached by any direct light beam or light
radiation, also it is recommended to keep the
bin door constantly closed and to follow the
instructions for the periodical cleaning of
the light sensor elements as detailed in the
MAINTENANCE AND CLEANING PROCEDURES.
At time of installation it's necessary to perform
the calibration of the I/R Ice Level control.
• Switch OFF the machine at Master Green
Push Button Switch
• Push and hold the PC Board Push Button
• Switch ON the machine at Master Green
Push Button Switch
• Few seconds later the LEDs of the PC
Board starts to blink
• Release the PC Board Push Button
The I/R Ice Level control is now calibrated.
K. Remove, if previously installed, the
refrigerant service gauges and re-fit the unit
service panels previously removed.
L. Instruct the owner/user on the general
operation of the ice machine and about the
cleaning and care it requires.
Page 16
Page 15
Page 15
PRINCIPLE OF OPERATION
How it works
In the SCOTSMAN Modular Cubers the water
used to make the ice is kept constantly in
circulation by an electric water pump which primes
it to the self propeller spray bar nozzles from
where it is diverted into the inverted mold cups of
the evaporator (Fig. B).
A small quantity of the sprayed water freezes into
ice; the rest of it cascades by gravity into the
sump assembly below for recirculation.
FREEZING CYCLE (Fig. A)
The hot gas refrigerant discharged out from the
compressor reaches the condenser where, being
cooled down, condenses into liquid. Flowing into
the liquid line it passes through the drier filter,
then it goes all the way through the capillary tube
where, due to the heat exchanging action, it
looses some of its heat content so that its pressure
and temperature are lowered as well.
Next the refrigerant enters into the evaporator
serpentine (which has a larger I.D. then the
capillary) and starts to boil off; this reaction is
emphasized by the heat transferred by the
sprayed water.
The refrigerant then increases in volume and
changes entirely into vapor.
The vapor refrigerant then passes through the
suction accumulator (used to prevent that any
small amount of liquid refrigerant may reach the
compressor) and through the suction line. In both
the accumulator and the suction line it exchanges
heat with the refrigerant flowing into the capillary
tube (warmer), before to be sucked in the
compressor and to be recirculated as hot
compressed refrigerant gas.
The freezing cycle is controlled by the evaporator
temperature sensor (which has its probe in contact
with the evaporator serpentine) that determines
the length of its first portion of the cycle.
When the temperature of the evaporator
serpentine drops to a pre-set value, the evaporator
sensor probe changes its electrical resistance
allowing a low voltage current (12 volts) to flow to
the P.C. BOARD which in turn activates an
electronic timer.
The timer, which is built-in the P.C. BOARD,
takes over from the evaporator temperature
sensor, the control of the freezing cycle up to its
completion.
NOTE.
The change of the electric potential of
the evaporator sensor with the consequent
activation of the timer (Time mode) is signalled
by the glowing-up of the RED LED located
beside the FREEZING yellow one in the front
of the P.C. BOARD.
ATTENTION. In case, after 15 minutes
from the beginning of the freezing cycle,
the temperature of the evaporator sensor
probe is higher then 0°C (32°F) (shortage
of refrigerant, inoperative hot gas valve,
etc.) the P.C. BOARD switch OFF
immediately the unit with the
simultaneous blinking of the WARNING
RED LED.
The length of this second portion of the freezing
cycle is pre-fixed and related to the setting of the
first four DIP SWITCH keys.
The DIP SWITCH keys setting is made in
consideration of the type of condenser used.
In Table B are indicated the various lengths of the
second portion of freezing cycle (Time mode) in
relation to the different combinations of the DIP
SWITCH KEYS.
In Table A herebelow are illustrated the DIP
SWITCH key combinations for the three different
factory.
Page 17
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Page 16
Page 18
Page 17
Page 17
The electrical components in operation during
the freezing cycle are:
COMPRESSOR
FAN MOTOR (in air cooled version)
WATER PUMP
CONTACTOR COIL
and during the second phase of freezing cycle
(Time mode) they are joined by the
ELECTRONIC TIMER
The refrigerant head pressure, in the course of
the freezing cycle, ranges between 18 and 16
bars (250-225 psig) being controlled by the temperature sensor probe located within the
condenser fins (air cooled version) or, on the
condenser tube coil (water cooled version).
On the air cooled version, the condenser temperature sensor, when senses a rising of the
condenser temperature beyond the pre-fixed
limit, changes its electrical resistance and send a
low voltage power flow to the Micro Processor of
P.C. BOARD which in turn energizes, through a
TRIAC, the FAN MOTOR.
When the opposite situation occures, i.e. the
condenser temperature gets below the pre-fixed
limit, the temperature sensor changes again its
electrical resistance reducing therefore the current
flow to the P.C. BOARD to cause the fan motor
temporary cut-off.
NOTE. On this model the condenser sensors
are used just to switch off the unit in case the
condensing temperature rise up to more then
70°C (for air cooled version) or more then
62°C (for water cooled version) for one of the
following abnormal reasons:
CLOGGED CONDENSER (Air cooled
version)
FAN MOTOR OUT OF OPERATION (Air
cooled version)
INSUFFICIENT FLOW OF COOLING
WATER (Water cooled version)
AMBIENT TEMPERATURE HIGHER THEN
40°C (100°F)
it causes the total and immediate SHUT-OFF
of the machine in order to prevent the unit
from operating in abnormal and dangerous
conditions.
When the ice maker stops on account of this
protective device, there is a simultaneous
glowing of the RED LED, warning the user of
the Hi Temperature situation.
After having efiminated the source of the
condenser hi-temperature, to restart the
machine just switching OFF and ON the unit
at main line switch.
The ice machine resumes its normal operation
by going through the 5 minutes water filling
phase.
At the start of the freezing cycle the refrigerant
suction or lo-pressure lowers rapidly to 2.5 bars-
35 psig then it declines gradually - in relation with
the growing of the ice thickness - to reach, at the
end of the cycle, approx. 1.6 ÷ 1.7 bar - 22 ÷ 24
psig with the cubes fully formed in the cup molds.
The total length of the freezing cycle ranges f rom
20 to 25 minutes.
DEFROST OR HARVEST CYCLE (Fig. D)
As the electronic timer has carried the system
throughout the second phase of freezing cycle,
the defrost cycle starts.
ATTENTION. In case the unit be able to
reach 0°C (32°F) evaporating temperatu-
re within 15 minutes, but after 45 minutes
from the beginning of the freezing cycle it
has not yet reached the evaporator temperature of -15°C (5° F) the machine goes
straight into the defrost cycle omitting
the timed portion of the freezing cycle
relied to the setting of the first four DIP
SWITCHES.
NOTE. The length of the defrost cycle is
related to the length of the second phase of
freezing cycle T2. (Time to drop the
evaporating temperature from 0°C (32°F) small Red LED blinking-to-15°C (5°F) small
Red LED ON steady.
It is possible to extend the length of the defrost
cycle by changing the setting of DIP SWITCH
7 and 8 as shown on table at page 24.
The electrical components in operation during
this phase are:
COMPRESSOR
CONTACTOR COIL
WATER INLET VALVE
HOT GAS VALVE
WATER DRAIN VALVE
and the
WATER PUMP
on the first 30 seconds.
The incoming water, passing through the water
inlet valve and the flow control, runs over the
evaporator platen and then flows by gravity
through the dribbler holes down into the sump/
reservoir (Fig. D).
The water filling the sump/reservoir forces part of
the surplus water from the previous freezing
cycle to go out to the waste through the overflow
pipe. This overflow limits the level of the sump
water which will be used to produce the next
batch of ice cubes.
Page 19
Page 18
Page 18
Meanwhile, the refrigerant as hot gas, discharged
from the compressor, flows through the hot gas
valve directly into the evaporator serpentine bypassing the condenser.
The hot gas circulating into the serpentine of the
evaporator warms up the copper molds causing
the defrost of the ice cubes. The ice cubes,
released from the cups, drop by gravity onto a
slanted cube chute, then through a curtained
opening they fall into the storage bin.
At the end of the defrost cycle, both the hot gas
and the water inlet valves close and the machine
starts again a new freezing cycle.
OPERATION - CONTROL SEQUENCE
At the start of freezing cycle, the evaporator
temperature sensor controls the length of the
first part of the freezing cycle. As it reaches a
predetermined temperature, it supplies a low
voltage current to the P.C. BOARD in order to
activate the electronic timer which, takes over
the control of the freezing cycle for a pre-fixed
time, according to the DIP SWITCH keys setting
(see Tab. B).
NOTE. The evaporator temperature sensor,
factory pre-set, is the same for all the models
and is not adjustable.
Once completed the freezing cycle 2nd phase
the system goes automatically into the defrost
cycle which also has a pre-fixed length. At
completion of the defrost cycle the P.C. BOARD
commands the unit to start again a new freezing
cycle.
OPERATION - ELECTRICAL SEQUENCE
The following charts illustrate which switches
and which components are ON or OFF during a
partÌcular phase of the icemaking cycle.
BEGINNIING FREEZE
Electrical components (Loads). ON OFF
Compressor.................................. •
Fan Motor (Air cooled only) and TRIAC
•
Hot Gas Valve .............................. •
Inlet Water Valve.......................... •
P.C. Board Relay 1 Coil ............... •
P.C. Board Relay 2 & 3 Coil......... •
Water Pump ................................. •
Contactor Coil .............................. •
Electronic Timer ........................... •
Electronic Controls & Sensors .. ON OFF
Evaporator Sensor ....................... •
Condenser Sensor ....................... •
Ice Level Control .......................... •
TIMED FREEZE
Electrical components (Loads). ON OFF
Compressor.................................. •
Fan Motor (Air cooled only) and TRIAC
••
Hot Gas Valve .............................. •
Inlet Water Valve.......................... •
P.C. Board Relay 1 Coil ............... •
P.C. Board Relay 2 & 3 Coil......... •
Water Pump ................................. •
Contactor Coil .............................. •
Electronic Timer ........................... •
Electronic Controls & Sensors . ON OFF
Evaporator Sensor ....................... •
Condenser Sensor ....................... • •
Ice Level Control .......................... •
HARVEST (Drain portion - first 30 sec.)
Electrical components (Loads). ON OFF
Compressor.................................. •
Fan Motor (Air cooled only) and TRIAC .
•
Hot Gas Valve .............................. •
Water Inlet Valve.......................... •
Water Drain Valve ........................ •
P.C. Board Relay 1 & 2 Coil......... •
P.C. Board Relay 3 Coil ............... •
Water Pump ................................. •
Contactor Coil .............................. •
P.C.B. Timer................................. •
HARVEST (Water filling portion)
Electrical components (Loads). ON OFF
Compressor.................................. •
Fan Motor (Air cooled only) and TRIAC .
•
Hot Gas Valve .............................. •
Water Inlet Valve.......................... •
Water Drain Valve ........................ •
P.C. Board Relay 1 & 2 Coil......... •
P.C. Board Relay 3 Coil ............... •
Water Pump ................................. •
Contactor Coil .............................. •
P.C. Board Timer ......................... •
Electronic Controls & Sensors . ON OFF
Evaporator Sensor ....................... •
Condenser Sensor ....................... •
Ice Level Control .......................... •
Page 20
Page 19
Page 19
Freeze Cycle
Average Discharge
Pressure A/C: 16÷18 bars (225÷250 psig)
Average Discharge
Pressure W/C: 17 bars (240 psig)
Suction Pressure End
Freeze Cycle: 1.6÷1.7 bar (22÷24 psig)
REFRIGERANT CHARGE (R 404 A)
Air Cooled Water Cooled
MC 46 1300 gr 700 gr
MC 46 (60 Hz) 1040 gr 560 gr
NOTE. Before charging the refrigerant system
always check the type of refrigerant and
quantity as specified on the individual ice
machine dataplate.
The refrigerant charges indicated are related
to average operating conditions.
WARNING. As R 404 a is a band of different
types of refrigerants it is imperative to
charge the system only in liquid phase in
order to avoid to alter their mix-up
percentage.
COMPONENTS DESCRIPTION
A. EVAPORATOR TEMPERATURE
SENSOR
The evaporator temperature sensor probe,
located in contact with the evaporator serpentine,
detects the dropping of the evaporator temperature during the freezing cycle and signals it by
supplying a current flow to the micro processor of
P.C. BOARD.
According to the current received, the evaporator
sensor supplies power to the P.C. BOARD first,
when it reachs 0°C (32°F), second at -15°C (5°F);
in this second case it supply power to the electronic
timer built into the P.C. BOARD so that it may
take control of the fength of the 2nd phase of
freezing cycle.
The length of the timed phase is pre-f ixed by the
setting of the keys 1, 2, 3 and 4 of the DIP
SWITCH.
The activation of the electronic timer (-15°C 5°F) is monitored by the lighting up of the RED
LED placed in the front of the P.C. BOARD.
This lighting up occures usually in the mid period
of the freezing cycle and signals the switching
from the first to the second phase of the freezing
cycle.
NOTE. Whenever, after 15 minutes from the
beginning of the freezing cycle, the
evaporating temperature have not yet
reached the value of 0°C (32°F), the P.C.
BOARD switches OFF the machine with the
BLINKING of RED LED.
B. CONDENSER TEMPERATURE SENSOR
The condenser temperature sensor probe,
located within the condenser fins (air cooled
version) or in contact with the tube coil (water
cooled version) detects the condenser temperature variations and signals them by supplying
current, at low voltage, to the P.C. BOARD.
In the air cooled versions, in relation to the
different current received, the micro processor of
the P.C. BOARD supplies, through a TRIAC, the
power at high voltage to the fan motor so to cool
the condenser and to reduce its temperature.
In case the condenser temperature rises and
reaches 70°C (1 60°F) - on air cooled models - or
62°C (145°F) - on water cooled models - the
current arriving to the micro processor is such to
cause an immediate and total stop of the machine
operation.
C. ICE BIN LEVEL LIGHT CONTROL
The electronic ice bin level control, located
into the storage bin, has the function to stop
the operation of the ice machine ONLY AT
THE END OF THE HARVEST CYCLE when
the light beam between the light source and
the sensor is interrupted by the ice cubes
stored into the bin.
When the light beam is interrupted the Bin Full
YELLOW LED starts blinking
.
SETTING OF THE ICE LEVEL
CONTROL SENSIVITY
In case of any need it's possible to up to date the
sensivity of the optical ice level control as per
here below procedure:
a)
Switch OFF the machine at Power Main Switch
b)Push and hold the PC Board Push Button
c)
Switch ON the machine at Power Main Switch
d) Keep pushed the PC Board Push Button
till the Leds of the PC Board are ON
e) Release the PC Board Push Button.
NOTE. The setting of the Ice Level Control
Sensivity must be done any time a new PC
Board or a new lce Level Control is installed
in the machine.
Page 21
Page 20
Page 20
D. P.C. BOARD (Data processor)
The P.C. BOARD, fitted in its plastic box located
in the front of the unit, consists of two separated
printed circuits one at high and the other at low
voltage integrated with two fuses one on power in
(32mA) and one on power out (6.3 A), of four
aligned LEDS monitoring the operation of the
machine, of one extra monitoring RED LED (blink
0°C - steady - 15°C), of one DIP SWITCH with ten
keys, of one push button, of input terminals for the
leads of the sensor probes and input and output
terminals for the leads of the ice maker electrical
wires.
The P.C. BOARD is the brain of the system and
it elaborates, through its micro processor, the
signals received from the three sensors in order
to control the operation of the different electrical
components of the ice maker (compressor, water
pump, solenoid valves, etc.).
At restart, from any tripping OFF at Bin Full, the
new PC Board assures 45 seconds water filling
phase so to refill the water sump up to the maximum
level.
In case of malfunction of the Optical Ice Level
Control, thenew PC Board switch ON alternativelt
the Yellow and Red Led continuously.
On the PC Board there are four jumpers to select:
• 6 or 12 months remind time for the water system
cleaning
• Operation of the Purge Out Water Pump (Jump
IN on EC series)
• 3 or 60 minutes delay time at first start up
(3 minutes in all new AC Series)
• TEST
In case the TEST contacts are closed with the
Jumper, at the Start Up of the machine the PC
Board energizes all the electrical components for
maximum 3 minutes time.
At the end of the 3 minutes the PC Board switch
OFF the entire machine with the blinking of all
the LED's as shown on the bottom drawing.
6-12
MONTHS
EC SERIES
0 OR 60 MINUTES
DELAY
TEST
ON STEADY
BLINKING
Page 22
Page 21
Page 21
E. PUSH BUTTON OPERATION
DURING WATER FILLING PHASE
• Push for more then 2” but less then 5” the
machine enters in Cleaning Mode
• Push for more then 5” the machine by-pass
the Water Filling Phase
DURING FREEZING/HARVEST CYCLE
• Push for more then 5” during the Freezing
cycle the machine goes immediately into Harvest
• Push for more then 5” during the Harvest cycle
the machine enters immediately in the Freezing
cycle
The length of Harvest is equal to:
• 35” if Push Button is activated before -15°C
evaporating temperature LED activation
• As per Harvest cycle chart, if Push Button
is activated after -15°C evaporating
temperature LED activation (Red LED inside
PC Board ON steady)
F. LED MEANING
GREEN LED ON
Unit under power
YELLOW BIN FULL LED ON
Unit shut-OFF at storage bin full
YELLOW BIN FULL LED BLINKING
Infrared beam break out
RED ALARM LED ON
Too hi condensing temperature
RED ALARM LED BLINKING
Too hi evaporating temperature
YELLOW FREEZING CYCLE ON
Unit in freezing cycle mode
YELLOW FREEZING LED AND RED ALARM
LED ON
Condenser sensor out of order
YELLOW FREEZING LED AND RED ALARM
LED BLINKING
Evaporator sensor out of order
FREEZING CYCLE
BIN FULL
POWER
TOO HI EVAP TEMP
TOO HI COND TEMP
PUSH
BUTTON
PUSH
BUTTON
LED STATUS
REASON WHY
ON STEADY UNIT UNDER POWER
ON STEADY FREEZING CYCLE
BLINKING
60 MINUTES DELA Y AT START UP
JUMPER J3 OUT
ON STEADY
TOO HI DISCHARGE
PRESSURE/TEMP
BLINKING
TOO HI EVAP. TEMP. (> 0C°)
AFTER 15’ FROM START UP
ON STEADY UNIT OFF AT BIN FULL
BLINKING
SLOW
I/R BEAM CUTTED
I/R ON AFTER TRIP OFF AT
BIN FULL
BLINKING
FAST
ON STEADY I/R CALIBRATION DONE
BLINKING
UNIT IN CLEANING MODE OR TRIPPING
OFF AFTER TEST - JUMPER TEST IN
ON STEADY
CONDENSER SENSOR OUT
OF ORDER
BLINKING
EVAPORATOR SENSOR OUT
OF ORDER
BLINKING
ALTERNATIVELY
I/R SENSOR OUT OF ORDER
PUSH
PUSH > 5” DURING WATER FILLING TO
MOVE THE UNIT INTO FREEZING
PUSH > 5” DURING FREEZING
TO MOVE THE UNIT INTO DEFROST
PUSH > 5” DURING DEFROST
TO MOVE THE UNIT INTO FREEZING
PUSH 2” > 5” DURING WATER FILLING
TO MOVE THE UNIT INTO CLEANING
PUSH DURING THE 60 MIN START UP
DELAY TIME TO BY-PASS IT
G. DIP SWITCH
The P.C.BOARD which controls the entire
operation of the ice maker, has a DIP SWITCH
with ten switching keys which allow to set up
the micro processor program in order to extend
or to shorten the length of freezing cycle in relation
to the different model and versions of ice machines.
The DIP SWITCH first four keys setting
determines the length of the 2nd phase of
freezing cycle (controlled by the electronic
timer) as detailed in the table B.
The DIP SWITCH keys 5 & 6 setting determines
the length of the defrost cycle according to the
Page 23
Page 22
Page 22
H. WATER SPRAY SYSTEM
Through its nozzles, the water pumped, is sprayed
in each individual cup to be frozen into ice.
It consists of one spray tube wheve are located
several spray nozzles.
I. WATER PUMP
The water pump operates continually throughout
the freezing cycle and on the first 15 or 30
seconds of the defrost cycle so to such the
remaining water from the sump tank (reach in
mineral salts) and drain it out.
During the freezing cycle the pump primes the
water from the sump to the spray system and
through the spray nozzles sprays it into the
inverted cup molds to be frozen into crystal clear
ice cubes.
It is recommended that the pump motor bearings
be checked at least every six months.
J. WATER INLET SOLENOID VALVE -
3/4 GAS MALE FITTING
The water inlet solenoid valve is activated by the
micro processor of the P.C. BOARD during the
first 5 minutes of water filling phase and as well
during the defrost cycle.
When energized it allows a metered amount of
incoming water to flow overt he evaporator cavity
to assist the hot gas in defrosting the ice cubes.
The water running over the evaporator cavity
drops by gravity, through the dribbler holes of
the platen, into the sump reservoir where it will be
sucked by the water pump and primed to the
spray system.
K. HOT GAS SOLENOID VALVE
The hot gas solenoid valve consists basically in
two parts: the valve body and the valve coil.
Located on the hot gas line, this valve is energized
through the micro processor of P.C. BOARD
during the defrost cycle and as well during the
water filling phase.
LENGTH OF TIMED PORTION OF FREEZING CYCLE ACCORDING TO THE
DIP SWITCH SETTING COMBINATIONS
TAB. B
size of the cubes (Large or Medium) as per the
following setting:
ON ON : PROGRAM A
ON OFF : PROGRAM B
OFF OFF : PROGRAM C
OFF ON : PROGRAM D
LENGTH OF HARVEST CYCLE
ACCORDING TO THE TIME TO DROP THE
EVAP. TEMPERATURE FROM 0°C TO -15°C
LENGTH PROGRAMS
HARVEST
CYCLE
ABCD
180” Up to 6’30” *** Up to 9’30” xxxx
165” 6’30”-7’ Up to 3’ 9’30”-10’ xxxx
150” 7’-8’ 3’-3’15’ 10’-11’ xxxx
135” 8’-9’ 3’15”-3’30” 11’-12’ xxxx
120” 9’-10’30” 3’30”-4’30” 12’-13’30” < 3'
105” 10’30”-12’ 4’30”-6’ 13’30”-15’ 3' - 4'
90” >12’ >6’ >15’ > 4'
The DIP SWITCH N° 7 and 8 allow the extention
of the length of the harvest/defrost cycle according
to their combination as per following chart:
DIP SWITCH ADDITIONAL DEFROST TIME
78
ON ON 0
OFF ON 30"
ON OFF 60"
OFF OFF WATER PUMP OFF
The 9th key is used to supply power to the water
pump for the first 15 seconds of the defrost cycle
- position OFF - or for the first 30 seconds -
position ON.
The 10th key is used to modify the CUT-OUT
condensing temperature from 70°C (160°F) for
the air cooled versions - ON position - to 60°C
(140°F) - OFF position - for the water cooled
versions.
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During the defrost cycle the hot gas valve coil is
activated so to attract the hot gas valve piston in
order to give way to the hot gas discharged from
the compressor to flow directly into the evaporator
serpentine to defrost the formed ice cubes.
L. FAN MOTOR (Alir cooled version)
The fan motor is controlled through the P.C.
BOARD and the TRIAC by the condenser temperature sensor. Normally it operates only during
the freezing cycle to draw cooling air through the
condenser fins.
In the second part of the freezing cycle, the fan
motor can run at intermittance as the condenser
pressure must be kept between two
corresponding head pressure values (16÷18 bars225÷250 psig).
M. COMPRESSOR
The hermetic compressor is the heart of the
refrigerant system and it is used to circulate and
retrieve the refrigerant throughout the entire
system.
It compresses the low pressure refrigerant vapor
causing its temperature to rise and become high
pressure hot vapor which is then released through
the discharge valve.
N. WATER REGULATING VALVE
(Water cooled version)
This valve controls the head pressure in the
refrigerant system by regulating the flow of water
going to the condenser.
As pressure increases, the water regulating valve opens to increase the flow of cooling water.
O. CONTACTOR
Placed outside of the control box it is controlled
by the P.C. BOARD in order to close or open the
electrical circuit to the compressor.
P. WATER DRAIN SOLENOID VALVE
The water drain solenoid valve, electrically
connected in parallel to the water inlet and to the
hot gas solenoid valves, is energized for all the
length of the defrost cycle.
By means of the water pump, that remains
energized for 30 seconds at the beginning of the
defrost cycle, it allows the drain out of all remaining
water (rich of minerals deposited during the
previous freezing cycle) from the sump tank.
By doing so it allows to the ice maker to make
every new freezing cycle with new fresh water,
avoiding thereby the accumulation of sediments
and scales, which soon or later will cause the
partial or total clogging of the water system on the
unit.
Q. CURRENT RELAY
(3 PHASE VERSION ONLY)
Connected in series to the 3 phase compressor
trips off the compressor contactor when the
current of one of the three phases is more then:
Voltage Current
230/50/3 8 Amps
230/60/3 9 Amps
400/50/3 6 Amps
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ADJUSTMENT, REMOVAL AND REPLACEMENT
PROCEDURES
SMALL
IDENTATION
LITTLE OR NO
ICE IN CENTER
OF CUBES
THICK BULGE
SOLID ICE
OVER SIZE
NORMAL SIZE-SHAPE
SHALLOW SIZE
A. ADJUSTMENT OF THE CUBE SIZE
CAUTION. Before performing actual
adjustment of the cube size, check other
possible causes for cube size problems,
refer to the Service Diagnosis Section for
problem review and analysis.
Do not perform any adjustment till the
icemaking system has progressed
through severaÏ complete freezing and
harvest cycle, to observe size and quality
of ice cubes and whether or not the cube
size problem exists.
I. lf the cubes are shallow size (Indentation is
too deep) probably the length of the second
phase of the freezing cycle is too short so, to
extend such length you have to:
1. Locate the DIP SWITCH on the front of the
P.C. Board.
2. Take note of thecombination of the first four
DIP SWITCH KEYS and check the corrisponding
length of freezing cycle 2nd phase on Table B.
3. Change the same DIP SWITCH KEYS
setting so that it will correspond to the combination
on table B pre-ceding the one remarked at
step 2.
This will allow an extension of the freezing cycle
of two more minutes.
4. Observe the ice cubes in the next two
harvests and eventually repeat steps 2 and 3
above until proper ice cubes size is achieved.
See figure.
II. lf the cubes are oversize size (Indentation is
too full) probably the length of the second phase
of the freezing cycle is too long.
To shorten such length you have to:
1 . Locate the DIP SWITCH on the front of the
P.C. Board.
2. Take note of the combination of the first four
DIP SWITCH KEYS and check the corrisponding
length of freezing cycle 2nd phase on Table B.
3. Change the same DIP SWITCH KEYS
setting so that it will correspond to the combination
on table B coming next to the one remarked at
step 2.
This will reduce an the freezing cycle length of
two minutes.
4. Observe the ice cubes in the next two
harvests and eventually repeat steps 2 and 3
above until proper ice cubes size is achieved.
See figure.
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WIRING DIAGRAM
MC-46 A-W 230/50/1
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WIRING DIAGRAM
MC-46 A-W 230/60/1
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WIRING DIAGRAM
MC-46 A-W
220/50-60/3 - 400/50/3 + N
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SERVICE DIAGNOSIS
SYMPTOM POSSIBLE CAUSE SUGGESTED CORRECTION
Unit will not run Blown power in fuse in P.C.Board Replace fuse & check for cause of
(No warning LEDS glows) blown fuse
Main switch in OFF position Turn switch to ON position
Inoperative P.C.Board Replace P.C.Board
Loose electrical connections Check wiring
(Green LED-Power ON glows)
Blown power out fuse in P.C. Board
Replace fuse & check for cause of
blown fuse
(Bin full LED glows) Inoperative ice level control Clean or replace ice level control
Inoperative P.C.Board Replace P.C.Board
(Red-alarm LED glows) High head pressure Dirty condenser. Clean
Inoperative fan motor. Replace
Shortage of water (WC)
(Red-alarm LED blinks) High evaporating temperature Hot gas valve leak - Replace it.
after 15 mins. beginning freeze Water inlet valve leak - Replace it.
Short of refrigerant.
Compressor cycles intermittently
(Freezing or Bin Full LED + Condenser sensor out of order Replace it
Red-alarm LED glow)
(Freezing or Bin Full LED + Evaporator sensor out of order Replace it
Red-alarm LED blink)
(Freezing or Bin Full LED + Ice Level Control out of order Replace it
Red-alarm LED blink alternatively)
Compressor cycles intermittently Low voltage Check circuit for overloading
Check voltage at the supply to the
building. If low, contact the power company
Contactor with burnt contacts Replace it
Non-condensable gas in system Purge the system
Compressor starting device with Check for loose wires in starting
loose wires device
Mechanical problem Replace compressor
Cubes too small Freezing cycle too short Review setting of DIP SWITCH keys
Capillary tube partially restricted
Blow charge, add new gas & drier, after
evacuating systemwithvacuum pump
Moisture in the system Same as above
Shortage of refrigerant Check for leaks & recharge
Cloudy cubes Shortage of water See remedies for shortage of water
Dirty water supply Use water softner or water filter
Accumulated impurities
Use SCOTSMAN Ice Machine cleaner
Shortage of water Water spilling out through curtain Check or replace curtain
Water solenoid valve not opening Replace valve
Water leak in sump area Locate and repair
Water flow control plugged Replace water inlet valve
Leak of water drain valve Replace valve
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SYMPTON POSSIBLE CAUSE SUGGESTED CORRECTION
Irregular cubes size & some Some jets plugged Remove spray bar & jet bearing
cloudy and clean them
Shortage of water See shortage of water
Unit not level Level as required
Spray bar not rotating Remove spray bar & jet bearing
and clean them
Cubes too large Freezing cycle too long
Review setting of DIP SWITCH keys
Inoperative evaporator sensor Replace sensor
Decreased ice capacity Inefficient compressor Replace
Leaky water valve Repair or replace
Non-condensable gas in system Purge the system
Poor air circulation or excessive Relocate the unit or provide for
hot location (Red-alarm LED glows
) more ventilation
Overcharge of refrigerant
Correct the charge. Purge off slowly
Capillary tube partially restricted Blow charge, add new gas & drier,
after evacuating system with
vacuum pump
Hot gas solenoid valve leaking Replace valve
Short of refrigerant Charge to data plate indication
Discharge head pressure too high See incorrect discharge pressure
Poor harvest Restriction in incoming water line
Check water valve strainer and flow
control. If necessary enlarge the
flow control orifice
Water inlet valve not opening Valve coil with open winding
Replace valve
Hot gas valve orifice restricted Replace hot gas valve assy
Clogged air vented holes in mold cups
Clean out holes plugged
Discharge head pressure too low See incorrect discharge pressure
Unit won’t harvest Inoperative P.C.Board Replace P.C.Board
Hot gas valve not opening Valve coil with open winding
Replace valve
Water solenoid valve not opening Valve coil with open winding
Replace valve
Incorrect discharge pressure Inoperative condenser sensor Replace sensor
Inoperative P.C.Board Replace P.C.Board
Water regulating valve misadjusted
Adjust its setting stem
Excessive water in unit base Water tubing leaking Check. Tighten or replace
SERVICE DIAGNOSIS
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MAINTENANCE AND CLEANING INSTRUCTIONS
A. GENERAL
The periods and the procedures for maintenance
and cleaning are given as guides and are not to
be construed as absolute or invariable.
Cleaning, especially, will vary depending upon
local water and ambient conditions and the ice
volume produced; and, each icemaker must be
maintened individually, in accordance with its
particular location requirements.
B. ICEMAKER
The following maintenance should be scheduled
at least two times per year on these icemakers.
1 . Check and clean the water line strainer.
2. Check that the icemaker is levelled in side
to side and in front to rear directions.
3. Clean the water system, evaporators, bin
and spray bar/s using a solution of SCOTSMAN
Ice Machine Cleaner.
Refer to procedure C cleaning instructions and
after cleaning will indicate frequency and procedure to be followed in local areas.
4. Reach the water spray bar from the inside of
the freezing chamber lifting it from its seat with its
bottom race washer.
Dip it into a tray filled with cleaning solution then
rinse it under a tap water stream.
With a pick clean the orifice of the water stream
jet that propells the spray bar.
NOTE. Cleaning requirements vary according
to the local water conditions and individual
user operation. Continuous check of the clarity
of ice cubes and visual inspection of the
water spraying parts before and after cleaning
will indicate frequency and procedure to be
followed in local areas.
5. With the ice machine and fan motor OFF on
air cooled models, clean condenser using vacuum
cleaner, whisk broom or non metallic brush taking
care to do not damage both the condenser and
ambient temperature sensor probes.
6. Check for water leaks and tighten drain line
connections. Pour water down through the
storage bin drain line to be sure that drain line is
open and clear.
7. Check size, condition and texture of ice
cubes. Perform adjustment of DIP SWITCH keys
as required.
8. Check the ice level control sensor to test
shut-off. Put some ice cubes between the light
source and the receiver so to cut off the light
beam for at least one minutes.
This should cause the ice maker to shut off and
the light-up of the 2nd LED (yellow light).
IMPORTANT. Perform the above check only
at the end of harvest cycle or at the beginning
of freezing cycle in order to do not cause to
the unit to make a double freezing cycle.
NOTE. Within few seconds after the removal
of the ice cubes from the Infrared sensing
light the icemaker restarts in freezing cycle.
The ice level control uses devices that sense
light, therefore they must be kept clean
enough so they can "see".
Every month clean/wipe the sensing "eyes"
with a clean soft cloth.
9. Check for refrigerant leaks.
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C. CLEANING INSTRUCTIONS OF
WATER SYSTEM
1. Remove left, center and right front panels to
gain access either to the control box and to the
evaporator.
2. Wait till the end of defrost cycle then turn the
unit OFF by the main switch (disconnect power
supply).
3. Prepare for each freezing chamber the
cleaning solution by diluting in a plastic container
two or three liters of warm water (45°-50°C) with
a 0,2-0,3 liters of SCOTSMAN Ice Machine
Cleaner.
WARNING. The SCOTSMAN Ice Machine
Cleaner contains Phosphoric and
Hydroxyacetic acids. These compounds
are corrosive and may cause burns if
swallowed, DO NOT induce vomiting.
Give large amounts of water or milk. Call
Physician immediatelly. In case of
external contact flush with water. KEEP
OUT OF THE REACH OF CHILDREN
4. Scoop out all the ice cubes stored into the
bin in order to prevent them from being
contaminated with the cleaning solution then
flush out the water from the sump reservoir by
bending down the vertical sump drain hose.
5. Remove the evaporator cover then slowly
pour onto the evaporator piaten the cleaning
solution- With the help of a brush dissolve the
most resistant and remote scale deposits in the
platen.
Perform the same for all the four evaporators.
6. Give power to the unit by the main switch.
7. During the Water Filling Phase push RESET
BUTTON for more then 2” but less then 5” the
machine enter in Cleaning Mode (Fig.7)
16
15
14
13
2
1
7
8
9
10
3
4
5
6
11
12
Rx Tx
WATER IN VALVE
HOT GAS VALVE
CONTACTOR COIL
FAN MOTOR
WATER PUMP
- EVAPORATOR
- AMBIENT
- CONDENSER
TEMPERATURE SENSORSBINCOMPRESSOR
TRANSF.
DATA
PROCESSOR
ELECTR.
TIMER
DIP
SWITCH
ELECTRONIC CARD
L
N
RELAYS
RELAY
TRIAC
WATER DRAIN VALVE
FIG. 7
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FIG. 8
8. With the system in Cleaning mode the
water pump is the only component in operation
to circulate the cleaning solution in the entire
water system
9. Let the unit remain in the cleaning mode for
about 20 minutes then turn the main switch to
OFF (disconnect unit from POWER)
10. Flush out the cleaning solution from the
sump reservoirs then pour onto each evaporator
cavity two or three liters of clean potable water
with a capfull of antibacteria solution to rinse and
sanitize the mold cups and the platen.
If necessary remove the water spry bar to clean
it separately as per steps 3 and 4 of paragraph B.
11. Give power to the unit by the main switch
12. During the Water Filling Phase push RESET
BUTTON for more then 2” but less then 5” the
machine enter in Rinsing Mode (Fig.7)
13. Let the unit remain in the RINSING MODE
mode for about 10 minutes then turn the main
switch to OFF (disconnect unit from POWER)
14. Flush out the rinsing solution from the sump
reservoirs
15. Place again the evaporator cover and the
unit service panels.
16. Give POWER to the unit.
17. At completion of the freezing and harvest
cycle make sure of proper texture and clearness
of the ice cubes and that, they do not have any
acid taste.
ATTENTION. in case the ice cubes are
cloudy, white and have an acid taste, melt
them immediatelly by pouring on them
some warm water. This to prevent that
somebody could use them.
18. Wipe clean and rinse the inner surfaces of
the storage bin.
REMEMBER. To prevent the accumulation
of undesirable bacteria it is necessary to
sanitize the interior of the storage bin with an
anti-algae disinfectant solution every week.
16
15
14
13
2
1
7
8
9
10
3
4
5
6
11
Rx Tx
WATER IN VALVE
HOT GAS VALVE
FAN MOTOR
WATER PUMP
- EVAPORATOR
- AMBIENT
- CONDENSER
TEMPERATURE SENSORSBINCOMPRESSOR
TRANSF.
DATA
PROCESSOR
ELECTR.
TIMER
DIP
SWITCH
ELECTRONIC CARD
L
N
RELAYS
RELAY
TRIAC
WATER DRAIN VALVE
CONTACTOR COIL
12
FIG. 8
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Sanitation
NOTE. Sanitation of the water system is
recommended to be done once a month.
19. Prepare in a plastic container the sanitation
solution as per manufacturer dilution using warm
water (45-50 °C).
NOTE. Never mix the cleaning with the
sanitising solution.
20. Follow the procedures as per cleaning (from
item 10 to item 13) just shorting the operation of
the water pump to 10 minutes.
21. Place again the evaporator cover and the
unit service panels.
22. At completion of the freezing and harvest
cycle make sure of proper texture and clearness
of the ice cubes and that, they do not have any
acid taste.
ATTENTION. In case the ice cubes are
cloudy-white and have an acid taste, melt
them immediately by pouring on them
some warm water. This to prevent that
somebody could use them.
23. Wipe clean and rinse the inner surfaces of
the storage bin.
REMEMBER.
To prevent the accumulation
of undesirable bacteria it is necessary to
sanitize every week the interior of the storage
bin.
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