Scotsman MXG 328 User manual

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Page 1
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
MXG 328
MXG 428
MXG 438
MXG 638
MXG 938
Electronic
modular cubers
REV. 06/2017
SERVICE MANUAL

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Page 2
TABLE OF
CONTENTS Table of contents
Specifications MXG 328
Specifications MXG 428
Specifications MXG 438
Specifications MXG 638
Specifications MXG 938
GENERAL INFORMATION AND INSTALLATION
Introduction
Unpacking and Inspection - Ice maker
Unpacking and Inspection - Storage bin
Location and levelling
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
5
7
9
11
21
23
24
25
30
31÷34
35
37
37
38
16
17
13
13
13
13
14
14
15
15

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Page 3
ice making capacity
SPECIFICATIONS
ELECTRONIC CUBER MODEL MXG 328
NOTE.Thedailyice-makingcapacityisdirectlyrelatedtothecondenserairinlettemperature,water
temperature and age of the machine.
TokeepyourSCOTSMAN MODULAR CUBER atpeakperformancelevels,periodicmaintenance
checks must be carried out as indicated on maintenance section of this manual.
Production charts shown are indicating the production of "M" (medium) and "L" (large) models. For
"S" (small) models ice production is approx. 10% lower.
WATER COOLED MODELS
32
38
10
21
151
149
147
145
143
141
139
137
135
133
131
129
127
125
123
121
119
117
115
113
111
109
107
105
103
101
99
97
95
93
91
89
87
85
83
Kg.
10 °C
27 21 15
AIR COOLED MODELS
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
32
38
10
21
150
148
146
144
142
140
138
136
134
132
130
128
126
124
122
120
118
116
114
Kg.
10 °C
27 21 15
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
32
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%

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Page 4
Basic electr. Amps Watts N. of wires Amps. fuse
220230/50/1/50/1 5.5 31 1200 23.3 3 x 1.5 mm216 3 x
-230/50/1 7 3 x
SPECIFICATIONS
MXG 328 - MACHINE SPECIFICATIONS
DIMENSIONS:
HEIGHT 720 mm.
WIDTH 568 mm.
DEPTH 703.5 mm.
WEIGHT 66 Kgs.
Starts Electric power cons.
amps. Kwh x 24 HR
Cubes per harvest: 72 Large - 106 Medium - 198 Small
* At 15°C (60°F) water temperature
MXG 328 AS 6 Air Stainless steel 320
MXG 328 WS 6 Water Stainless steel 1250*
Model Cond. unit Finish Water req. - lt/24 HR

Page 5
Page 5
ice making capacity
SPECIFICATIONS
ELECTRONIC CUBER MODEL MXG 428
NOTE.Thedailyice-makingcapacityisdirectlyrelatedtothecondenserairinlettemperature,water
temperature and age of the machine.
TokeepyourSCOTSMAN MODULAR CUBER atpeakperformancelevels,periodicmaintenance
checks must be carried out as indicated on maintenance section of this manual.
Production charts shown are indicating the production of "M" (medium) and "L" (large) models. For
"S" (small) models ice production is approx. 10% lower.
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%
32
38
10
21
190
188
186
184
182
180
178
176
174
172
170
168
166
164
162
160
158
156
154
152
150
148
146
144
142
140
138
136
134
132
130
128
126
124
122
120
118
116
114
112
110
108
106
104
102
100
98
96
Kg.
10 °C
27 21 15
AIR COOLED MODELS
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
32
32
38
10
21
196
194
192
190
188
186
184
182
180
178
176
174
172
170
168
166
164
162
160
158
156
154
152
150
148
146
144
Kg.
10 °C
27 21 15
WATER COOLED MODELS
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
32

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Page 6
220-230/50/1 7 1850 36.7 3 x
Basic electr. Amps Watts N. of wires Amps. fuse
230/50/1N9.9 31 3 x 1.5 m/m216
400/50/3N5 x 1.5 m/m2
MXG 428 AS 6 Air Stainless steel
MXG 428 WS 6 Water Stainless steel
Model Cond. unit Finish Water req. - lt/24 HR
SPECIFICATIONS
370
MXG 428 - MACHINE SPECIFICATIONS
DIMENSIONS:
HEIGHT 720 mm.
WIDTH 568 mm.
DEPTH 703.5 mm.
WEIGHT 66 Kgs.
Starts Electric power cons.
amps. Kwh x 24 HR
Cubes per harvest: 72 Large - 106 Medium - 198 Small
* At 15°C (60°F) water temperature

Page 7
Page 7
ice making capacity
SPECIFICATIONS
ELECTRONIC CUBER MODEL MXG 438
NOTE.Thedailyice-makingcapacityisdirectlyrelatedtothecondenserairinlettemperature,water
temperature and age of the machine.
TokeepyourSCOTSMAN MODULAR CUBER atpeakperformancelevels,periodicmaintenance
checks must be carried out as indicated on maintenance section of this manual.
Production charts shown are indicating the production of "M" (medium) and "L" (large) models. For
"S" (small) models ice production is approx. 10% lower.
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%
32
38
10
21
190
188
186
184
182
180
178
176
174
172
170
168
166
164
162
160
158
156
154
152
150
148
146
144
142
140
138
136
134
132
130
128
126
124
122
120
118
116
114
112
110
108
106
104
102
100
98
96
Kg.
10 °C
27 21 15
AIR COOLED MODELS
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
32
32
38
10
21
196
194
192
190
188
186
184
182
180
178
176
174
172
170
168
166
164
162
160
158
156
154
152
150
148
146
144
Kg.
10 °C
27 21 15
WATER COOLED MODELS
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
32

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Page 8
220-230/50/1 7 1850 36.7 3 x
Basic electr. Amps Watts N. of wires Amps. fuse
230/50/1N9.9 31 3 x 1.5 m/m216
400/50/3N5 x 1.5 m/m2
SPECIFICATIONS
MXG 438 - MACHINE SPECIFICATIONS
DIMENSIONS:
HEIGHT 720 mm.
WIDTH 773 mm.
DEPTH 704.5 mm.
WEIGHT 73 Kgs.
Starts Electric power cons.
amps. Kwh x 24 HR
Cubes per harvest: 72 Large - 106 Medium - 198 Small
* At 15°C (60°F) water temperature
MXG 438 AS 6 Air Stainless steel
MXG 438 WS 6 Water Stainless steel
Model Cond. unit Finish Water req. - lt/24 HR
370

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Page 9
ice making capacity
SPECIFICATIONS
ELECTRONIC CUBER MODEL MXG 638
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.Thedailyice-makingcapacityisdirectlyrelatedtothecondenserairinlettemperature,water
temperature and age of the machine.
TokeepyourSCOTSMAN 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 "M" (medium) and "L" (large) models. For
"S" (small) models ice production is approx. 10% lower.
WATER COOLED MODELS
32
38
10
21
330
325
320
315
310
305
300
295
290
285
280
275
270
265
260
255
250
245
240
235
230
225
220
215
210
205
200
195
190
185
180
175
Kg.
10 °C
27 21 15
AIR COOLED MODELS
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
32
32
38
10
21
340
335
330
325
320
315
310
305
300
295
290
285
280
275
270
265
260
255
Kg.
10 °C
27 21 15
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
32

Page 10
Page 10
Basic electr. Amps Watts N. of wires Amps. fuse
230/50/1N14.1 66 02500 3 x 1.5 m/m220
400/50/3N5.3 26.5 2800 5 x 1.5 m/m2
SPECIFICATIONS
MXG 638 - MACHINE SPECIFICATIONS
DIMENSIONS:
HEIGHT 1128 mm.
WIDTH 773 mm.
DEPTH 700 mm.
WEIGHT 116 Kgs.
Starts Electric power cons.
amps. Kwh x 24 HR
Cubes per harvest: 144 Large - 212 Medium - 396 Small
* At 15°C (60°F) water temperature
52
MXG 638 AS 6 Air Stainless steel 550
MXG 638 WS 6 Water Stainless steel 3400
Model Cond. unit Finish Water req. - lt/24 HR

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ice making capacity
SPECIFICATIONS
ELECTRONIC CUBER MODEL MXG 938
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.Thedailyice-makingcapacityisdirectlyrelatedtothecondenserairinlettemperature,water
temperature and age of the machine.
TokeepyourSCOTSMAN 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 "M" (medium) and "L" (large) models. For
"S" (small) models ice production is approx. 10% lower.
32
38
10
21
400
396
392
388
384
380
376
372
368
364
360
356
352
348
344
340
336
332
328
324
320
316
312
308
304
300
296
292
288
284
280
276
272
268
264
260
256
252
248
244
240
236
Kg.
10 °C
27 21 15
AIR COOLED MODELS
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
32
32
38
10
21
400
398
396
394
392
390
388
386
384
382
380
378
376
374
372
370
368
366
364
362
360
358
356
354
352
350
348
346
344
342
340
338
336
334
332
330
328
326
324
322
320
318
316
314
312
310
308
Kg.
10 °C
27 21 15
WATER COOLED MODELS
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
32

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Page 12
Basic electr. Amps Watts N. of wires Amps. fuse
N
400/50/3N9 51 5 x 1.5 m/m220
SPECIFICATIONS
MXG 938 - MACHINE SPECIFICATIONS
DIMENSIONS:
HEIGHT 1236 mm.
WIDTH 773 mm.
DEPTH 704.5 mm.
WEIGHT 140 Kgs.
Starts Electric power cons.
amps. Kwh x 24 HR
Cubes per harvest: 144 Large - 212 Medium - 396 Small
* At 15°C (60°F) water temperature
MXG 938 AS 6 Air Stainless steel
MXG 938 WS 6 Water Stainless steel 2750
Model Cond. unit Finish Water req. - lt/24 HR
900
3200
2800 69.3 66.5

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Page 13
A. INTRODUCTION
This manual provides the specifications and the
step-by-stepproceduresfortheinstallation,start-
up 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.Toretainthesafetyandperformance
built into this icemaker, it is important that
installation and maintenance be conducted
in the manner outlined in this manual.
Storage Bin
Since the MXG series Modular Cubers do not
have their own attached ice storage bins, it is
necessary to use an auxiliary bin such as:
SB 193
SB 322
SB 393
SB 530.
B. UNPACKING AND INSPECTION
Modular Cuber
1. CallyourauthorizedSCOTSMANDistributor
or Dealer for proper installation.
2. Visually inspect the exterior of the packing
and skid. Any severe damage noted should be
reportedtothedeliveringcarrierandaconcealed
damage claim form filled in subjet to inspection
of the contents with the carrier’s representative
present.
3. a)Cutandremovetheplasticstripsecuring
the carton box to the skid.
b) Remove the packing nails securing the
carton box to the skid.
c)Cutopenthetopofthecartonandremove
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. Loosetwo nutson leftand rightsside ofthe
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
againstor touchother linesor surfaces,and that
the fan blade moveS freely.
8. Checkthatthe 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 fill-
in all parts including: Model and Serial Number
taken from the data plate.
Forward the completed self-addressed
registration card to Scotsman Ice srl.
C. LOCATION AND LEVELLING
WARNING. This Ice Cuber is designed
for indoor installation only. Extended
periods of operation at temperature
exceedingthe following limitations will
constitute misuse under the terms of
theSCOTSMANManufacturer’sLimited
Warrantyresulting inLOSS ofwarranty
coverage.
1. Position the Bin in the selected permanent
location.Criteriaforselectionoflocationinclude:
a)Minimumroomtemperature10°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
rearoftheicemaker.Aminimumclearanceof15
cm (6") must be left at the sides of the unit for
routingcooling airdrawninto andexhaustedout
of the compartment to maintain proper
condensing operation of air cooled models.
2. Level the Storage Bin Assy in both the left
to right and front to rear directions by means of
the adjustable legs.

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Page 14
3. InspecttheStorageBintopmountinggasket
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. LiftalittlebittheModularCuberrightsidein
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 side of the ice chute
opening.
7. Tracetheicelevelcontrolassy,securedfor
the transport 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
plugsotopreventitfrom 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. SecuretheModularCuberon thetop ofthe
StorageBinusingthetwoboltsanddiberwasher
foundinthehardwarepackagesuppliedwiththe
unit.
D. ELECTRICAL CONNECTIONS
See data plate for current requirements to
determine wire size to be used for electrical
connections.AllSCOTSMANicemakersrequire
a solid earth wire.
All SCOTSMAN ice machines are supplied from
thefactorycompletelypre-wiredandrequireonly
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).
Themaximumallowablevoltagevariationshould
not exceed -10% and +10% of the data plate
rating. Low voltage can cause faulty functioning
and may be responsible for serious damage to
the overload switch and motor windings.
NOTE. All external wiring should conform to
national, state and local standards and
regulations.
Check voltage on the line and the ice maker’s
data plate before connecting the unit.
E. WATER SUPPLY AND DRAIN
CONNECTIONS
General
When choosing the water supply for the ice
modularcuber consideration shouldbegiven to:
a) Length of run
b) Water clarity and purity
c) Adequate water supply pressure
Sincewateristhemostimportantsingleingredient
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
Connectthe3/4"GASmale fittingofthesolenoid
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
Makersrequiretwoseparateinletwatersupplies,
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).
Aventattheunitdrainconnectionisalsorequired
for proper sump drainage.
Water drain - Water cooled models
Connectthe3/4"GASmalefittingofthecondenser
waterdrain,usingasecondflexibletubingora3/
8" O.D. copper tubing, to the open trapped and
vented drain.
NOTE.Thewatersupplyandthewaterdrain
must be installed to conform with the local
code. In some case a licensed plumber and/
or a plumbing permit is required.

Page 15
Page 15
F. FINAL CHECK LIST
1. Is the unit in a room where ambient
temperatures are within a minimum of 10°C
(50°F) even in winter months?
2. Is there at least a 15 cm (6") clearance
around the unit for proper air circulation?
3. Is the unit level? (IMPORTANT)
4. Have all the electrical and plumbing
connectionsbeen made,and isthe watersupply
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. Havetheboltsholdingthecompressordown
been checked to ensure that the compressor is
snugly fitted onto the mounting pads?
8. Checkallrefrigerantlinesandconduitlines
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.
G. INSTALLATION PRACTICE
1. Hand shut-off valve
2. Water filter
3. Water supply line (flexible hose)
4. 3/4" gas male fitting
5. Power line
6. Main switch
7/9. Drain fitting
8/10. Vented drain line
11. Open trapped vented drain
WARNING. This icemaker is not designed for outdoor installation and will not function in
ambient temperatures below 10°C (50°F) or above 40°C (100°F).
This icemaker will malfunction with water temperatures below 5°C (40°F) or above 35°C
(90°F).

Page 16
Page 16
OPERATING INSTRUCTIONS
NOTE. Pcb is equipped by "no delay"
(MXG 328-428-438) or 60 minutes jumper
setting start up delay (seepag.26). In case
of pcb setting to 60 minutes (MXG 638 - 938)
icemakerdoesn'tstartuntilthistimeiselapsed.
After having correctly installed the ice maker
and completed the plumbing and electrical
connections, perform the following “Start-up”
procedure.
START UP
Afterhavingcorrectlyinstalledtheicemakerand
completed the plumbing and electrical
connections,performthefollowing“Start-up”pro-
cedure.
A. Give power to the unit to start it up by
switching "ON" the power line main disconnect
switch and push "Green button Power" switch at
unit front panel.
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,towash-offanydirtthatcanhave
deposited in it during the unit off period
(Fig.1).
B. During the water filling operation, check to
seethattheincomingwaterdribbles,throughthe
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

Page 17
Page 17
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.Thewaterpressureofthewatersupplyline
thatmustbeatleast1bar(14psig)Minimum
(Max 5 bar-70 psig).
2.The filtering device installed in the water
linethatmayreducethewaterpressurebelow
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
FANMOTOR/S (inaircooledversion)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
thecondenserfins,keepthehead(condensing)
pressure at average 21 ° C amb/15 ° C water
temp.between14and16bars(203-232psig).
In the water cooled models the discharge
pressure is kept constant at the value of 15
bars(217psig)bymeansofawaterregulating
valve located on the water supply line to the
condenser.
Incaseofcondensercloggingsuchtoprevent
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
reaches70 ° C(160 ° F)-foraircooledversion
-or 60 ° C(140 ° F)- for water cooled version -
the condenser temperature sensor shuts-off
theicemakerwiththeconsequentlight-upof
the RED WARNING LED (Fig.3).
Afterhavingdiagnosedthereasonoftherise
of temperature and removed its cause, it is
necessarytounplug (waitfew seconds)and
pluginagaintheunit,thustoputthemachine
in condition to initiate a new freezing cycle.
Themachinerestartswiththeusual5minutes
waterfillingphaseinordertoprovideenough
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 18
Page 18
E. Check to see through the ice discharge
opening that the self propeller spray bar is
correctlyrotatingandthatthewaterjetsuniformely
reach the interior of the inverted mold cups and
there is not excessive water spilling through it.
F. Theicemakingprocesstakesplacethereby,
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 19
Page 19
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
Duringthefreezingprocess,whentheevaporator
temperature falls below an established value, to
the evaporator temperature sensor supplies a
lowvoltagepowersignaltotheelectroniccontrol
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. Thelengthoftheentirefreezingcycle
is governed by the evaporator temperature
sensorwhichhasits brobe placed in contact
with the evaporator serpentine (Non
adjustable)incombinationwiththeelectronic
timer (Adjustable) incorporated in the P.C.
BOARD).
The timer adjustment is factory set in
considerationoftheicemakermodel,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
areshownthevarioustimeextensionsofthe
freezingcyclesecond phase, inrelationwith
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 for the first 30 seconds
WATER INLET SOLENOID VALVE
HOT GAS VALVE
WATER DRAIN SOLENOID VALVE/S
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.
Itispossibletoextendthelengthofthedefrost
cyclebychangingthesettingofDIPSWITCH
7 and 8 as shown on table at page 28.
H. Check, during the defrost cycle, that the
incomingwaterflowscorrectlyintosumpreservoir
in order to refill it and that the surplus overflows
through the overflow drain tube.

Page 20
Page 20
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. Checkthetextureoficecubesjustreleased.
They have to be in the right shape with a small
depression of about 5-6 mm in their crown.
Ifnot,waitforthecompletionofthesecondcycle
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. Tobesureofthecorrectoperationoficelevel
controldevice,placesomeicecubesbetweenits
sensing “eyes” to interrupt the light beam.
TheBin FullYELLOW LED startsblinking fillthe
endofdefrostcycleafterward,theunitstopswith
the simultaneous glowing of the same LED to
monitor the BIN FULL situation (Fig.6).
Remove ice cubes out from the ice level control
sensors to allow the resumption of the light
beam. Water inlet valve is energized for 45
secondstorefillthesump,theBINFULLYELLOW
LEDblinksfastandafterapproximately6seconds
the ice maker resume its operation with the
immediate glowing of the FIRST YELLOW LED
indicating UNIT IN OPERATION and the
extinguishingofthe“BINFULL”YELLOWLED.
NOTE. The ICE LEVEL CONTROL
(INFRAREDSYSTEM)isindependentofthe
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,alsoitisrecommendedtokeepthe
bin door constantly closed and to follow the
instructions for the periodical cleaning of
thelightsensorelementsasdetailedinthe
MAINTENANCE AND CLEANING PRO-
CEDURES.
Attimeofinstallationit'snecessarytoperform
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 are ON
• 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.