Scotsman AC 106 User manual

Page 1
Page 1
SERVICE MANUAL
AC 106
AC 126
AC 176
AC 206
AC 226
Electronic cubers
with storage
MS 1000.90 REV. 02/2007

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Page 2
INDICE 2
3
5
7
9
11
13
13
13
13
14
14
15
16
17
37
37
37
38
Table of contents page
Specifications AC 106
Specifications AC 126
Specifications AC 176
Specifications AC 206
Specifications AC 226
GENERAL INFORMATION AND INSTALLATION
Introduction
Unpacking and Inspection
Location and levelling
Electrical connections
Water supply and drain connections
Final check list
Installation practice
OPERATING INSTRUCTIONS
Start up
Operational checks
OPERATING PRINCIPLES (How it works)
Freezing cycle
Harvest cycle
Electrical sequence
Components description
ADJUSTMENT, REMOVAL AND REPLACEMENT PROCEDURES
Adjustment of the cube size
Wiring diagram AC 106
Wiring diagram AC 126 - AC 176 - AC 206 - AC 226
Wiring diagram ACS 126 - ACS 176
Service diagnosis
MAINTENANCE AND CLEANING INSTRUCTIONS
General
Icemaker
Clean - Replace of air condenser filter
Cleaning instructions of water system
30
31
32
33
34
21
24
25
26

Page 3
Page 3
MIN.
10°C
5°C
1 bar
-10%
Important operating requirements:
Air temperature
Water temperature
Water pressure
Electr. voltage variations
from voltage rating
specified
on nameplate
SPECIFICATIONS
ELECTRONIC CUBER MODEL AC 106
MAX.
40°C
35°C
5 bar
+10%
ice making capacity
NOTE .Withtheunitin"built-in"conditions,theiceproductionisgraduallyreducedinrespecttothe
levels shown in the graf, up to a maximum of 10% at room temperatures higher than 32 ° C.
The daily ice-making capacity is directly related to the condenser air inlet temperature, water
temperature conditions of the condenser air filter and age of the machine.
TokeepyourSCOTSMANCUBERatpeakperformancelevels,periodicmaintenancechecksmust
be carried out as indicated on Maintenance and Cleaning section of this manual.
AIR COOLED MODELS
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
WATER COOLED MODELS
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
WATER TEMPERATURE
50
48
46
44
42
40
38
36
34
32
Kg. 10
21
32
38
°C
o
32 27 21 15 10 °C
o
51
49
47
45
43
41
39
37
35
Kg.
10
21
32
38
32 27 21 15 10 °C
o

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Page 4
AC 106 AS 6 Air
AC 106 WS 6 Water Stainless steel 3/8 23 Kg.
Start . Electric power cons.
Amps Kwh per 24 Hr
Model Cond. unit Finish Comp. HP
SPECIFICATIONS
Basic electr. Amps Watts Nr. of wires Amps fuse
230/50/1 3.3 18 550 3 x 1.5 mm210
0136 **
550*
AC 106 - CUBER
machine specifications
Cubes per harvest: 32 medium
* A 15°C water temperature
Dimensions:
HEIGHT (without legs) 850 mm.
HEIGHT (with legs) 970 mm.
WIDTH 530 mm.
DEPTH 600 mm.
WEIGHT 45 Kgs.
10.3
9.4
Bin Water req.
Capacity lt/24 HR
850

Page 5
Page 5
MIN.
10°C
5°C
1 bar
-10%
Important operating requirements:
Air temperature
Water temperature
Water pressure
Electr. voltage variations
from voltage rating
specified
on nameplate
SPECIFICATIONS
ELECTRONIC CUBER MODEL AC 126
MAX.
40°C
35°C
5 bar
+10%
ice making capacity
NOTE .Withtheunitin"built-in"conditions,theiceproductionisgraduallyreducedinrespecttothe
levels shown in the graf, up to a maximum of 10% at room temperatures higher than 32 ° C.
The daily ice-making capacity is directly related to the condenser air inlet temperature, water
temperature conditions of the condenser air filter and age of the machine.
TokeepyourSCOTSMANCUBERatpeakperformancelevels,periodicmaintenancechecksmust
be carried out as indicated on Maintenance and Cleaning section of this manual.
AIR COOLED MODELS
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
WATER COOLED MODELS
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
WATER TEMPERATURE
75
70
65
60
55
50
45
Kg.
10
21
32
38
°C
o
32 27 21 15 10 °C
o
75
70
65
60
55
50
45
Kg.
10
21
32
38
°C
o
32 27 21 15 10

Page 6
Page 6
AC 126 AS 6 Air
AC 126 WS 6 Water Stainless steel 1/2 39 Kg.
Start . Electric power cons.
Amps Kwh per 24 Hr
Model Cond. unit Finish Comp. HP
SPECIFICATIONS
Basic electr. Amps Watts Nr. of wires Amps fuse
230/50/1 4 19 600 3 x 1.5 mm210
190*
750*
AC 126 - CUBER
machine specifications
Cubes per harvest: 48 medium
* A 15°C water temperature
Dimensions:
HEIGHT (without legs) 930 mm.
HEIGHT (with legs) 1050 mm.
WIDTH 680 mm.
DEPTH 600 mm.
WEIGHT 75 Kgs.
14.8
11.8
Bin Water req.
Capacity lt/24 HR
- OVERFLOW DRAIN
CORD SET
WATER INLET
WATER INLET - WATER COOLED UNIT
WATER OUTLET - WATER COOLED UNIT
ADJUSTABLE FOOT
MIN. FOR UTILITY CONNECTIONS

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Page 7
MIN.
10°C
5°C
1 bar
-10%
Important operating requirements:
Air temperature
Water temperature
Water pressure
Electr. voltage variations
from voltage rating
specified
on nameplate
SPECIFICATIONS
ELECTRONIC CUBER MODEL AC 176
MAX.
40°C
35°C
5 bar
+10%
ice making capacity
NOTE .Withtheunitin"built-in"conditions,theiceproductionisgraduallyreducedinrespecttothe
levels shown in the graf, up to a maximum of 10% at room temperatures higher than 32 ° C.
The daily ice-making capacity is directly related to the condenser air inlet temperature, water
temperature conditions of the condenser air filter and age of the machine.
TokeepyourSCOTSMANCUBERatpeakperformancelevels,periodicmaintenancechecksmust
be carried out as indicated on Maintenance and Cleaning section of this manual.
AIR COOLED MODELS
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
WATER COOLED MODELS
84
82
80
78
76
74
72
70
68
66
64
62
60
58
56
Kg.
10
21
32
38
°C
o
32 27 21 15 10 °C
o
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
86
84
82
80
78
76
74
72
70
68
66
64
62
60
58
Kg.
10
21
32
38
°C
o
32 27 21 15 10 °C
o

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AC 176 AS 6 Air
AC 176 WS 6 Water Stainless steel 3/4 48 Kg.
Start . Electric power cons.
Amps Kwh per 24 Hr
Model Cond. unit Finish Comp. HP
SPECIFICATIONS
Basic electr. Amps Watts Nr. of wires Amps fuse
230/50/1 5.6 26 760 3 x 1.5 mm210
150*
1050*
AC 176 - CUBER
machine specifications
Cubes per harvest: 48 medium
* A 15°C water temperature
Dimensions:
HEIGHT (without legs) 1000 mm.
HEIGHT (with legs) 1120 mm.
WIDTH 680 mm.
DEPTH 600 mm.
WEIGHT 80 Kgs.
15.0
13.5
Bin Water req.
Capacity lt/24 HR
- OVERFLOW DRAIN
CORD SET
WATER INLET
WATER INLET - WATER COOLED UNIT
WATER OUTLET - WATER COOLED UNIT
ADJUSTABLE FOOT
MIN. FOR UTILITY CONNECTIONS

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Page 9
MIN.
10°C
5°C
1 bar
-10%
Important operating requirements:
Air temperature
Water temperature
Water pressure
Electr. voltage variations
from voltage rating
specified
on nameplate
SPECIFICATIONS
ELECTRONIC CUBER MODEL AC 206
MAX.
40°C
35°C
5 bar
+10%
ice making capacity
NOTE .Thedailyice-makingcapacityisdirectlyrelatedtothecondenserairinlettemperature,water
temperature conditions of the condenser air filter and age of the machine.
Production charts shown indicate the production of ACM models; ice production of ACL and ACS
models is 10% lower.
TokeepyourSCOTSMANCUBERatpeakperformancelevels,periodicmaintenancechecksmust
be carried out as indicated on Maintenance and Cleaning section of this manual.
AIR COOLED MODELS
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
WATER COOLED MODELS
130
128
126
124
122
120
118
116
114
112
110
108
106
104
102
100
98
96
94
92
90
88
86
84
82
80
78
76
74
72
70
Kg. 10
21
32
38
°C
32 27 21 15 10 °C
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
138
136
134
132
130
128
126
124
122
120
118
116
114
112
110
108
106
104
102
100
98
96
Kg.
10
21
32
38
°C
32 27 21 15 10 °C

Page 10
Page 10
Stainless steel 1/2 50 Kg.
Start . Electric power cons.
Amps Kwh per 24 Hr
Model Cond. unit Finish Comp. HP
SPECIFICATIONS
Basic electr. Amps Watts Nr. of wires Amps fuse
230/50/1 4.7 19 950 3 x 1.5 mm216
280*
1400*
AC 206 - CUBER
machine specifications
Cubes per harvest: 72 large / 102 medium / 198 small
* A 15°C water temperature
20.8
17.3
Bin Water req.
Capacity lt/24 HR
AC 206 AS 6 Air
AC 206 WS 6 Water
Dimensions:
HEIGHT (without legs) 780 mm.
HEIGHT (with legs) 860 mm.
WIDTH 1250 mm.
DEPTH 620 mm.
WEIGHT 115 Kgs.
ADJUSTABLE FOOT

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MIN.
10°C
5°C
1 bar
-10%
Important operating requirements:
Air temperature
Water temperature
Water pressure
Electr. voltage variations
from voltage rating
specified
on nameplate
SPECIFICATIONS
ELECTRONIC CUBER MODEL AC 226
MAX.
40°C
35°C
5 bar
+10%
ice making capacity
AIR COOLED MODELS
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
WATER COOLED MODELS
148
144
140
136
132
128
124
120
116
112
108
104
100
96
92
88
84
Kg.
10
21
32
38
°C
o
32 27 21 15 10 °C
o
WATER TEMPERATURE
AMBIENT TEMPERATURE
ICE PRODUCED PER 24 HRS.
152
148
144
140
136
132
128
124
120
116
112
108
Kg.
10
21
32
38
°C
o
32 27 21 15 10 °C
o
NOTE .Thedailyice-makingcapacityisdirectlyrelatedtothecondenserairinlettemperature,water
temperature conditions of the condenser air filter and age of the machine.
Production charts shown indicate the production of ACM models; ice production of ACL and ACS
models is 10% lower.
TokeepyourSCOTSMANCUBERatpeakperformancelevels,periodicmaintenancechecksmust
be carried out as indicated on Maintenance and Cleaning section of this manual.

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AC 226 AS 6 Air
AC 226 WS 6 Water Stainless steel 1 70 Kg.
Start . Electric power cons.
Amps Kwh per 24 Hr
Model Cond. unit Finish Comp. HP
SPECIFICATIONS
Basic electr. Amps Watts Nr. of wires Amps fuse
230/50/1 5.2 29 1180 3 x 1.5 mm216
330*
1800*
AC 226 - CUBER
machine specifications
Cubes per harvest: 72 large / 102 medium / 198 small
* A 15°C water temperature
Dimensions:
HEIGHT (without legs) 1006 mm.
HEIGHT (with legs) 1126 mm.
WIDTH 1078 mm.
DEPTH 715 mm.
WEIGHT 120 Kgs.
24.2
19.2
Bin Water req.
Capacity lt/24 HR
ADJUSTABLE FOOT
OVERFLOW DRAIN
CORD SET
WATER OUTLET - WATER COOLED UNIT
WATER INLET - WATER COOLED UNIT
MIN. FOR UTILITY CONNECTIONS
WATER INLET

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8. Use clean damp cloth to wipe the surfaces
inside the storage bin and the outside of the
cabinet.
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 Frimont factory.
11. Ifnecessary,replacethefourstandardlegs
with the taller ones supplied in the machine and
adjust them to level the unit.
C. LOCATION AND LEVELLING
WARNING.This Ice Cuber is designed for
indoorinstallationonly.Extendedperiods
of operation at temperatures exceeding
the following limitations will constitute
misuseunderthetermsoftheSCOTSMAN
Manufacturer’sLimitedWarrantyresulting
in LOSS of warranty coverage.
1. Position the unit in the selected permanent
location.
Criteria for selection of location include:
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
beleftforallserviceconnectionsthroughtherear
of the ice maker. A minimum clearance of 15 cm
(6")mustbeleftatthesidesoftheunitforrouting
cooling air drawn into and exhausted out of the
compartment to maintain proper condensing
operation of air cooled models.
2. Level the unit in both the left to right and
front to rear directions.
D. ELECTRICAL CONNECTIONS
See data plate for current requirements to
determine wire size to be used for electrical
connections.AllSCOTSMAN icemakersrequire
a solid earth wire.
A. INTRODUCTION
This manual provides the specifications and the
step-by-stepproceduresfortheinstallation,start-
up and operation, maintenance and cleaning for
the SCOTSMAN AC series icemakers.
These 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 performance standards.
NOTE .Toretainthesafetyandperformance
built into this icemaker, it is important that
installation and maintenance be conducted
in the manner outlined in this manual.
B. UNPACKING AND INSPECTION
1. CallyourauthorizedSCOTSMANDistributor
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
thecontentswiththecarrier’srepresentativepresent.
3. a)Cutandremovetheplasticstripsecuring
the carton box to the skid.
b)Cutopenthetopofthecartonandremove
the polystyre protection sheet.
c) Pull out the polystyre posts from the
corners and then remove the carton.
4. Remove the front panel of the unit and
inspectforanyconcealeddamage.Notifycarrier
ofyourclaimfortheconcealeddamageassteted
in step 2 above.
5. Check that refrigerant lines do not rub
againstor touch other lines or surfaces, and that
the fan blade moves freely.
6. Check that the compressor fits snugly onto
all its mounting pads.
7. Remove all internal support packing and
masking tape.
GENERAL INFORMATION AND INSTALLATION

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Page 14
All SCOTSMAN ice machines are supplied from
thefactorycompletelypre-wiredandrequireonly
electrical power connections to the wire cord
provided at 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
Whenchoosingthewatersupplyfortheicecuber
consideration should be given 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
Air Cooled Versions
Connect the 3/4" male fitting of the solenoid
waterinletvalve,usingtheflexibletubesupplied,
tothecoldwatersupplylinewithregularplumbing
fitting and a shut-off valve installed in an
accessible position between the water supply
line and the unit.
If water contains a high level of impurities, it is
advisable to consider the use an appropriate
water filter or conditioner.
Water Cooled Versions (AC 106 only)
OnWaterCooledversionthewaterinletsolenoid
valve has two separate outlets one for the
condenser and the second for the production of
ice.
Water supply - Water cooled models
(Not on AC 106)
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.
WATER DRAIN - WATER COOLED MODELS
Connect the 3/4" male fitting of the condenser
water drain, utilizing a second flexible hose, 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.
F. FINAL CHECK LIST
1. Is the unit in a room where ambient
temperatures are within a minimum of 10°C
(50°F) even in winter months?
2. Is there at least a 15 cm (6") clearance
around the unit for proper air circulation?
3. Is the unit level? (IMPORTANT)
4. Have all the electrical and plumbing
connections been made, and is the water
supply shut-off valve open?
5. Hasthevoltagebeentestedandchecked
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. Check all refrigerant lines and conduit
lines to guard against vibrations and possible
failure.

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Page 15
G. INSTALLATION PRACTICE
1. Hand shut-off valve
2. Water filter
3. Water supply line (flexible hose)
4. 3/4" male fitting
5. Vented drain
6. Open trapped vented drain
7. Drain fitting
8. Main switch
9. Power line
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).
1
23
4
5
6
7
8
9
8. Havetheboltsholdingthecompressordown
been checked to ensure that the compressor is
snugly fitted onto the mounting pads?
9. Have the bin liner and cabinet been wiped
clean?
10. Has the owner/user been given the User
Manualandbeeninstructedontheimportanceof
periodic maintenance checks?
11. Has the Manufacturer’s registration card
been filled in properly? Check for correct model
and serial number against the serial plate and
mail the registration card to the factory.
12. Has the owner been given the name and
thephonenumberoftheauthorizedSCOTSMAN
Service Agency serving him?

Page 16
Page 16
START UP
Afterhavingcorrectlyinstalledtheicemakerand
completed the plumbing and electrical
connections,performthefollowing“Start-up”pro-
cedure.
A. SwitchONthepowerlinedisconnectswitch
and push the green button switch. Unit will start
up in charging cycle mode.
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
OPERATING INSTRUCTIONS
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 (Not
on AC 106).
NOTE. If in the 5 minutes lenght 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
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.
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
Incaseofaircondenserfiltercloggedsuchto
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,thecondensertemperaturerises
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) as well as the Red Alarm Light
(ON Steady).
Afterhavingdiagnosedthereasonoftherise
of temperature and removed its cause, it is
necessarytoSwitchOFF (waitfewseconds)
and Switch ON the unit, thus to put the
machineinconditiontoinitiateanewfreezing
cycle.
Themachinerestartswiththeusual5minutes
waterfillingphaseinordertoprovideenough
water into the sump tank.
C. At completion of the water filling phase
(5minutes)theunitpassesautomaticallyintothe
freezing cycle with the start up of:
COMPRESSOR
CONTACTOR COIL (Not on AC 106)
WATER PUMP
FANMOTOR(inaircooledversion)controlledby
thecondensingtemperaturesensorlocatedwithin
the condenser fins (Fig.2).
OPERATIONAL CHECKS
D. Install, if required, the refrigerant service
gauges on both the high side and low side
Scraeder valves to check the compressor head
and suction pressures.
NOTE.On aircooledmodels,thecondenser
temperature sensor, which is located within
the condenser fins, keep the head
(condensing) pressure between 8.5 and 9.5
bar(110 ÷ 130psig) - 15-17 bar (220-245 psi)
on AC 206 and AC 226.
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
openingthatthespraysystemiscorrectlyseated
and that the water jets uniformely reach the
interioroftheinvertedmoldcups;alsomakesure
thattheplasticcurtain ishangingfreelyandthere
is not excessive water spilling through it.
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
F. Theicemakingprocesstakesplacethereby,
with the water sprayed into the molds that gets
graduallyrefrigeratedbytheheatexchangewith
the refrigerant flowing into the evaporator
serpentine. During the freezing process, when
the evaporator temperature falls below an
established value, the evaporator temperature
sensorsuppliesalowvoltagepowersignaltothe
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 lenght of the entire freezing
cycle is governed by the evaporator tempe-
rature sensor which has its probe placed in
contactwith theevaporatorserpentine(Non
adjustable)incombinationwiththeelectronic
timer (Adjustable) incorporated in the
P.C.BOARD.Thetimeradjustmentisfactory
set in consideration of the ice maker type,
cooling version and ice cube size (Small,
Medium, Large). It is possible, however, to
modifythetimedlenghtofthefreezingcycle,
by changing the DIP SWITCH keys setting.
In Table B of PRINCIPLE OF OPERATION
areshownthevarioustimeextensionsofthe
freezingcyclesecondphase,inrelationwith
the different DIP SWITCH keys setting.
G. Afterabout17÷20minutesfromthebegin-
ning of the freezing cycle, in an hypothetic
ambienttemperatureof21°C,thedefrostcycle
takes place with the hot gas, the water inlet
and the water drain valves simoultaneously
activated (Fig. 5).
Theelectricalcomponentsinoperationonmodels
are:
COMPRESSOR
CONTACTOR COIL (Not on AC 106)
WATER INLET VALVE
HOT GAS VALVE
WATER DRAIN VALVE
and the
WATER PUMP
on the first 15 seconds on models AC 106,
AC 126 & AC 176 and 30 seconds on models
AC 206 & AC 226.
NOTE. The lenght of the defrost cycle is
automatically determinated by the micro-
processor of the P.C. BOARD in relation of
the time necessary for the unit to reduce the
evaporatortemperaturefrom0 ° C(32 ° F)small
Red LED blinking to -15 ° C (5 ° F) small Red
LED ON steady - TIME T2.
I tispossibletoextendthelengthofthedefrost
cyclebychangingthesettingofDIPSWITCH
7 and 8 as shown on table at page 32.
H. Check, during the defrost cycle, that the
incoming water flows correctly into the sump
reservoir in order to refill it and that the surplus
overflows through the overflow drain tube.
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

Page 20
Page 20
I. Checkthetextureoficecubesjustreleased.
They have to be in the right shape with a small
depression of about 5-6 mm in their crown.
Ifnot, waitfor the completionof thesecondcycle
before performing any adjustment.
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 moni-
tor the BIN FULL situation (Fig.6).
Take the hand out from the ice level control
sensorstoallowtheresumptionofthelightbeam.
After approximately 6 seconds the ice maker
resumeits 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
(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.
ItssensivitycanbeadjustedbyturningtheIR
trimmer.
K. Remove,iffitted,therefrigerantservice
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.
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