AC0176 ServiceManual
AC0176 ServiceManual
AC0176 ServiceManual
SERVICE MANUAL
AC 106
AC 126
AC 176
AC 206
AC 226
Electronic cubers
with storage
New PC Board
version
SCOTSMAN EUROPE - FRIMONT SPA
Via Puccini, 22 - 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 ISO
900
Website: www.scotsman-ice.com 1-C
ert.
n. 0
E-Mail: scotsman.europe@frimont.it 080
OPERATING INSTRUCTIONS
Start up 16
Operational checks 17
SPECIFICATIONS
MIN. MAX.
Air temperature 10°C 40°C
Water temperature 5°C 35°C
Water pressure 1 bar 5 bar
Electr. voltage variations
from voltage rating
specified
on nameplate -10% +10%
48 21 49
AMBIENT TEMPERATURE
AMBIENT TEMPERATURE
46 21
47
44
45
42 32
32 43 38
40
41
38 38
39
36
34 37
32 35
32 27 21 15 10 o°C 32 27 21 15 10 o°C
NOTE. With the unit in "built-in" conditions, the ice production is gradually reduced in respect to the
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.
To keep your SCOTSMAN CUBER at peak performance levels, periodic maintenance checks must
be carried out as indicated on Maintenance and Cleaning section of this manual.
Page 4 Page 4
SPECIFICATIONS
Dimensions:
HEIGHT (without legs) 850 mm.
HEIGHT (with legs) 970 mm.
WIDTH 530 mm.
DEPTH 600 mm.
WEIGHT 45 Kgs.
AC 106 - CUBER
machine specifications
Bin Water req.
Model Cond. unit Finish Comp. HP Capacity lt/24 HR
SPECIFICATIONS
MIN. MAX.
Air temperature 10°C 40°C
Water temperature 5°C 35°C
Water pressure 1 bar 5 bar
Electr. voltage variations
from voltage rating
specified
on nameplate -10% +10%
75 75 10
21
ICE PRODUCED PER 24 HRS.
10
AMBIENT TEMPERATURE
70 70
ICE PRODUCED PER 24 HRS.
21
AMBIENT TEMPERATURE
32
65 65 38
60 32 60
55 55
38
50 50
45 45
32 27 21 15 10 o°C 32 27 21 15 10
NOTE. With the unit in "built-in" conditions, the ice production is gradually reduced in respect to the
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.
To keep your SCOTSMAN CUBER at peak performance levels, periodic maintenance checks must
be carried out as indicated on Maintenance and Cleaning section of this manual.
Page 6 Page 6
SPECIFICATIONS
Dimensions:
HEIGHT (without legs) 930 mm.
HEIGHT (with legs) 1050 mm.
WIDTH 680 mm.
DEPTH 600 mm.
WEIGHT 75 Kgs.
AC 126 - CUBER
machine specifications
Bin Water req.
Model Cond. unit Finish Comp. HP Capacity lt/24 HR
SPECIFICATIONS
MIN. MAX.
Air temperature 10°C 40°C
Water temperature 5°C 35°C
Water pressure 1 bar 5 bar
Electr. voltage variations
from voltage rating
specified
on nameplate -10% +10%
84 10 86
10
82 84
ICE PRODUCED PER 24 HRS.
21
AMBIENT TEMPERATURE
AMBIENT TEMPERATURE
80 82
78 80 21
76 78
74 32 76
72 74
70 72 32
38
68 70 38
66 68
64 66
62 64
60 62
58 60
56 58
32 27 21 15 10 o°C 32 27 21 15 10 o°C
NOTE. With the unit in "built-in" conditions, the ice production is gradually reduced in respect to the
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.
To keep your SCOTSMAN CUBER at peak performance levels, periodic maintenance checks must
be carried out as indicated on Maintenance and Cleaning section of this manual.
Page 8 Page 8
SPECIFICATIONS
Dimensions:
HEIGHT (without legs) 1000 mm.
HEIGHT (with legs) 1120 mm.
WIDTH 680 mm.
DEPTH 600 mm.
WEIGHT 80 Kgs.
AC 176 - CUBER
machine specifications
Bin Water req.
Model Cond. unit Finish Comp. HP Capacity lt/24 HR
SPECIFICATIONS
MIN. MAX.
Air temperature 10°C 40°C
Water temperature 5°C 35°C
Water pressure 1 bar 5 bar
Electr. voltage variations
from voltage rating
specified
on nameplate -10% +10%
AMBIENT TEMPERATURE
114 32
126
112
110 124 38
108
122
106
104 120
102 118
100 32
98 116
96 114
94
112
92
90 110
88
38 108
86
84 106
82 104
80
78 102
76 100
74
98
72
70 96
32 27 21 15 10 °C 32 27 21 15 10 °C
NOTE. 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.
Production charts shown indicate the production of ACM models; ice production of ACL and ACS
models is 10% lower.
To keep your SCOTSMAN CUBER at peak performance levels, periodic maintenance checks must
be carried out as indicated on Maintenance and Cleaning section of this manual.
Page 10 Page 10
SPECIFICATIONS
ADJUSTABLE FOOT
Dimensions:
HEIGHT (without legs) 780 mm.
HEIGHT (with legs) 860 mm.
WIDTH 1250 mm.
DEPTH 620 mm.
WEIGHT 115 Kgs.
AC 206 - CUBER
machine specifications
Bin Water req.
Model Cond. unit Finish Comp. HP Capacity lt/24 HR
SPECIFICATIONS
MIN. MAX.
Air temperature 10°C 40°C
Water temperature 5°C 35°C
Water pressure 1 bar 5 bar
Electr. voltage variations
from voltage rating
specified
on nameplate -10% +10%
148 152
10 10
144
21 148 21
140
136 144 32
ICE PRODUCED PER 24 HRS.
AMBIENT TEMPERATURE
132
140
128 38
124 32 136
120
132
116
38 128
112
108
124
104
100 120
96 116
92
112
88
84 108
32 27 21 15 10 o°C 32 27 21 15 10 o°C
NOTE. 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.
Production charts shown indicate the production of ACM models; ice production of ACL and ACS
models is 10% lower.
To keep your SCOTSMAN CUBER at peak performance levels, periodic maintenance checks must
be carried out as indicated on Maintenance and Cleaning section of this manual.
Page 12 Page 12
SPECIFICATIONS
WATER INLET
ADJUSTABLE FOOT
CORD SET
Dimensions:
HEIGHT (without legs) 1006 mm.
HEIGHT (with legs) 1126 mm.
WIDTH 1078 mm.
DEPTH 715 mm.
WEIGHT 120 Kgs.
AC 226 - CUBER
machine specifications
Bin Water req.
Model Cond. unit Finish Comp. HP Capacity lt/24 HR
D. ELECTRICAL CONNECTIONS
All SCOTSMAN ice machines are supplied from Water supply - Water cooled models
the factory completely pre-wired and require only (Not on AC 106)
electrical power connections to the wire cord The water cooled versions of SCOTSMAN Ice
provided at rear of the unit. Makers require two separate inlet water supplies,
Make sure that the ice machine is connected to one for the water sprayed for making the ice
its own circuit and individually fused (see data cubes and the other for the water cooled
plate for fuse size). condenser.
The maximum allowable voltage variation should Connect the 3/4" GAS male fitting of the water
not exceed -10% and + 10% of the data plate inlet, using the flexible tubing or a 3/8" O.D.
rating. Low voltage can cause faulty functioning copper pipe, to the cold water supply line with
and may be responsible for serious damage to regular plumbing fitting and a shut-off valve
the overload switch and motor windings. installed in an accessible position between the
water supply line and the unit.
8. Have the bolts holding the compressor down 11. Has the Manufacturer’s registration card
been checked to ensure that the compressor is been filled in properly? Check for correct model
snugly fitted onto the mounting pads?
and serial number against the serial plate and
9. Have the bin liner and cabinet been wiped mail the registration card to the factory.
clean?
12. Has the owner been given the name and
10. Has the owner/user been given the User the phone number of the authorized SCOTSMAN
Manual and been instructed on the importance of
periodic maintenance checks? Service Agency serving him?
G. INSTALLATION PRACTICE
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
FIG. 1
- EVAPORATOR
16
WATER IN VALVE
DIP 7
- CONDENSER SWITCH 8
COMPRESSOR
DATA
RELAYS 3
Rx Tx
BIN
4
13
FAN MOTOR
L 1 TRIAC 5
6
N 2 TRANSF.
WATER PUMP
RELAY 11
12
ELECTRONIC CARD
Page 17 Page 17
FIG. 2
- EVAPORATOR
16
WATER IN VALVE
DIP 7
- CONDENSER SWITCH 8
COMPRESSOR
DATA
RELAYS 3
Rx Tx
BIN
4
13
FAN MOTOR
L 1 TRIAC 5
6
N 2 TRANSF.
WATER PUMP
RELAY 11
12
ELECTRONIC CARD
Page 18 Page 18
FIG. 3
- EVAPORATOR
16
WATER IN VALVE
DIP 7
- CONDENSER SWITCH 8
PROCESSOR
COMPRESSOR
DATA
RELAYS 3
Rx Tx
BIN
4
13
FAN MOTOR
L 1 TRIAC 5
6
N 2 TRANSF.
WATER PUMP
RELAY 11
12
ELECTRONIC CARD
E. Check to see through the ice discharge interior of the inverted mold cups; also make sure
opening that the spray system is correctly seated that the plastic curtain is hanging freely and there
and that the water jets uniformely reach the is not excessive water spilling through it.
FIG. 4
TEMPERATURE SENSORS
COMPRESSOR
RELAYS 3
Rx Tx
BIN
4
13
FAN MOTOR
L 1 TRIAC 5
6
N 2 TRANSF.
WATER PUMP
RELAY 11
12
ELECTRONIC CARD
Page 19 Page 19
F. The ice making process takes place thereby, activated (Fig. 5).
with the water sprayed into the molds that gets The electrical components in operation on models
gradually refrigerated by the heat exchange with are:
the refrigerant flowing into the evaporator COMPRESSOR
serpentine. During the freezing process, the
evaporator temperature falls to 0°C (Red Led WATER INLET VALVE
blinking as per Fig. 4) and then to -15°C (Red Led HOT GAS VALVE
ON steady as per Fig. 4a). When it reaches WATER DRAIN VALVE
-15°C the evaporator temperature sensor and the
supplies a low voltage power signal to the
electronic control device (P.C.BOARD) in order WATER PUMP
to activate an electronic timer. This one takes on the first 15 seconds on models AC 106,
over the control of the freezing cycle up to the AC 126 & AC 176 and 30 seconds on models
complete formation of the ice cubes. AC 206 & AC 226.
NOTE. The lenght of the entire freezing NOTE. The lenght of the defrost cycle is
cycle is governed by the evaporator tempe- automatically determinated by the micro-
rature sensor which has its probe placed in processor of the P.C. BOARD in relation of
contact with the evaporator serpentine (Non the time necessary for the unit to reduce the
adjustable) in combination with the electronic evaporator temperature from 0°C (32°F) small
timer (Adjustable) incorporated in the Red LED blinking to -15°C (5°F) small Red
P.C.BOARD. The timer adjustment is factory LED ON steady - TIME T2.
set in consideration of the ice maker type, It is possible to extend the length of the defrost
cooling version and ice cube size (Small, cycle by changing the setting of DIP SWITCH
Medium, Large). It is possible, however, to 7 and 8 as shown on table at page 32.
modify the timed lenght of the freezing cycle,
by changing the DIP SWITCH keys setting.
In Table B of PRINCIPLE OF OPERATION H. Check, during the defrost cycle, that the
are shown the various time extensions of the incoming water flows correctly into the sump
freezing cycle second phase, in relation with reservoir in order to refill it and that the surplus
the different DIP SWITCH keys setting. overflows through the overflow drain tube.
G. After about 17÷20 minutes from the begin- I. Check the texture of ice cubes just released.
ning of the freezing cycle, in an hypothetic They have to be in the right shape with a small
ambient temperature of 21°C, the defrost cycle depression of about 5-6 mm in their crown.
takes place with the hot gas, the water inlet If not, wait for the completion of the second cycle
and the water drain valves simoultaneously before performing any adjustment.
FIG. 4a
- EVAPORATOR
16
WATER IN VALVE
DIP 7
- CONDENSER SWITCH 8
COMPRESSOR
DATA
RELAYS 3
Rx Tx
BIN
4
13
FAN MOTOR
L 1 TRIAC 5
6
N 2 TRANSF.
WATER PUMP
RELAY 11
12
ELECTRONIC CARD
Page 20 Page 20
FIG. 5
- EVAPORATOR
16
WATER IN VALVE
DIP 7
- CONDENSER SWITCH 8
PROCESSOR
COMPRESSOR
DATA
RELAYS 3
Rx Tx
BIN
4
13
FAN MOTOR
L 1 TRIAC 5
6
N 2 TRANSF.
WATER PUMP
RELAY 11
12
ELECTRONIC CARD
FIG. 6
- EVAPORATOR
16
WATER IN VALVE
DIP 7
- CONDENSER SWITCH 8
PROCESSOR
COMPRESSOR
DATA
RELAYS 3
Rx Tx
BIN
4
13
FAN MOTOR
L 1 TRIAC 5
6
N 2 TRANSF.
WATER PUMP
RELAY 11
12
ELECTRONIC CARD
FIG. 6a
- EVAPORATOR
16
WATER IN VALVE
DIP 7
- CONDENSER SWITCH 8
COMPRESSOR
DATA
RELAYS 3
Rx Tx
BIN
4
13
FAN MOTOR
L 1 TRIAC 5
6
N 2 TRANSF.
WATER PUMP
RELAY 11
12
ELECTRONIC CARD
Page 22 Page 22
PRINCIPLE OF OPERATION
How it works
In the SCOTSMAN cube ice makers the water The freezing cycle is controlled by the evaporator
used to make the ice is kept constantly in temperature sensor (which has its probe in
circulation by an electric water pump which primes contact with the evaporator serpentine) that
it to the spray system nozzles from where it is determines the length of its first portion of the cycle.
diverted into the inverted mold cups of the When the temperature of the evaporator
evaporator. A small quantity of the sprayed serpentine drops to a pre-set value (small Red
water freezes into ice; the rest of it cascades by LED ON steady) the evaporator sensor probe
gravity into the sump assembly below for changes its electrical resistance allowing a low
recirculation. voltage current (15 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
FREEZING CYCLE over from the evaporator temperature sensor,
The hot gas refrigerant discharged out from the the control of the freezing cycle up to its completion.
compressor reaches the condenser where, being
cooled down, condenses into liquid. NOTE. The change of the electric potential of
Flowing into the liquid line it passes through the the evaporator sensor with the consequent
drier filter, then it goes all the way through the activation of the timer (Time mode) is signalled
capillary tube where, due to the heat exchanging by the glowing-up of the RED LED located in
action, it looses some of its heat content so that the front of the P.C. BOARD.
its pressure and temperature are lowered as
well.
Next the refrigerant enters into the evaporator ATTENTION. In case, after 15 minutes
serpentine (which has a larger I.D. then the from the beginning of the freezing cycle,
capillary) and starts to boil off; this reaction is the temperature of the evaporator sensor
emphasized by the heat transferred by the probe is higher then 0° C (32°F) - small
sprayed water. Red LED still OFF - (shortage of refrigerant,
The refrigerant then increases in volume and inoperative hot gas valve, etc.) the P.C.
changes entirely into vapor. BOARD switch OFF immediately the unit
The vapor refrigerant then passes through the with the simultaneous blinking of the
suction accumulator (used to prevent that any WARNING RED LED.
small amount of liquid refrigerant may reach the
compressor) and through the suction line. In both The length of this timed portion of the freezing
the accumulator and the suction line it exchanges cycle is pre-fixed and related to the setting of the
heat with the refrigerant flowing into the capillary first four DIP SWITCH keys.
tube (warmer), before to be sucked in the The DIP SWITCH keys setting is made in
compressor and to be recirculated as hot consideration of the type of condenser used and
compressed refrigerant gas. size of ice cubes.
TAB. A DIP SWITCH FACTORY SETTING COMBINATIONS (PER MODEL AND VERSION)
FIG. A FIG. B
FIG. C FIG. D
Page 24 Page 24
FIG. E FIG. F
FIG. G FIG. H
Page 25 Page 25
In Table B are indicated the various lengths of the the ice thickness - to reach, at the end of the
timed portion of freezing cycle in relation to the cycle, approx. 0÷0,1 bar - 0÷0,3 psig on models
different combinations of the DIP SWITCH KEYS. AC 106, AC 126 and AC 176 and to 1.7 bar (24
In Table A are illustrated the DIP SWITCH keys psi) on AC 206-226 with the cubes fully formed in
combinations for the different models and versions the cup molds. The total length of the freezing
as they are set in the factory. The electrical cycle ranges from 20 to 25 minutes.
components in operation during the freezing
cycle are:
COMPRESSOR DEFROST OR HARVEST CYCLE (Fig.E and G)
FAN MOTOR (in air cooled version) As the electronic timer has carried the system
WATER PUMP throughout the second phase of freezing cycle,
the defrost cycle starts.
and during the second phase of freezing cycle
(Time mode) they are joined by the ATTENTION. In case the unit is able to
ELECTRONIC TIMER reach 0°C (32°F) evaporating temperature
The refrigerant head pressure, in the course of within 15 minutes, but after 45 minutes
the freezing cycle, ranges between 8.5 and 9.5 from the beginning of the freezing cycle it
bars (110÷130 psig) on models AC 106, AC 126 has not yet reached the evaporator tem-
and AC 176 and between - 15-17 bar (220-245 perature of -15°C (5°F) the machine goes
psi) on AC 206-226 in the air cooled version, straight into the defrost cycle omitting the
being controlled by the temperature sensor probe timed portion of the freezing cycle relied to
located within the condenser fins. the setting of the first four DIP SWITCHES.
On the air cooled version, the condenser tempe-
rature sensor, when senses a rising of the
condenser temperature beyond the pre-fixed NOTE. The length of the defrost cycle is
limit, changes its electrical resistance and related to the length of the second phase of
transmits a low voltage power flow to the Micro freezing cycle T2. (Time to drop the
Processor of P.C. BOARD which in turn energizes, evaporating temperature from 0°C (32°F) -
through a TRIAC, the FAN MOTOR. small Red LED blinking - to -15°C (5°F) small
When the opposite situation occures, i.e. the Red LED ON steady.
condenser temperature gets below the pre-fixed It is possible to extend the length of the defrost
limit, the temperature sensor changes again its cycle by changing the setting of DIP SWITCH
electrical resistance reducing therefore the current 7 and 8 as shown on table at page 32.
flow to the P.C. BOARD to cause the fan motor
temporary cut-off. The electrical components in operation during
this phase are:
NOTE. In case the condenser temperature COMPRESSOR
probe senses that the condenser temperatu-
re has rised to 70°C (160°F) - on air cooled WATER INLET VALVE
versions - or 60°C (140°F) - on water cooled HOT GAS VALVE
versions - for one of the following reasons: WATER DRAIN VALVE
CLOGGED CONDENSER (Air cooled version) and the
INSUFFICIENT FLOW OF COOLING WATER PUMP
WATER (Water cooled version) on the first 15 seconds (AC 106 - AC 126 - AC 176)
FAN MOTOR OUT OF OPERATION (Air or 30 seconds (AC 206-226 only).
cooled version) The incoming water, passing through the water
AMBIENT TEMPERATURE HIGHER THEN inlet valve and the flow control, runs over the
40°C (100°F) evaporator platen and then flows by gravity
it causes the total and immediate SHUT-OFF through the dribbler holes down into the sump/
of the machine in order to prevent the unit reservoir. (Fig. F and H )
from operating in abnormal and dangerous The water filling the sump/reservoir forces part of
conditions. When the ice maker stops on the surplus water from the previous freezing
account of this protective device, there is a cycle to go out to the waste through the overflow
simultaneous glowing of the RED LED and pipe. This overflow limits the level of the sump
RED LIGHT (STEADY), warning the user of water which will be used to produce the next
the Hi Temperature situation. After having batch of ice cubes. Meanwhile, the refrigerant as
eliminated the source of the condenser hi- hot gas, discharged from the compressor, flows
temperature, to restart the machine it is through the hot gas valve directly into the
necessary to switch OFF (wait few seconds) evaporator serpentine by-passing the condenser.
and switch ON again the unit. The ice machine The hot gas circulating into the serpentine of the
resumes its normal operation by going through evaporator warms up the copper molds causing
the 5 minutes water filling phase. the defrost of the ice cubes. The ice cubes,
released from the cups, drop by gravity onto a
At the start of the freezing cycle the refrigerant slanted cube chute, then through a curtained
suction or lo-pressure lowers rapidly to 1 bar - opening they fall into the storage bin. At the end
14 psig on models AC 106, AC 126 and AC 176 of the defrost cycle, the hot gas valve, the water
and to 2.5 bar (35 psi) on AC 206-226 - then it inlet valve and the water drain valve close and
declines gradually - in relation with the growing of the machine starts again a new freezing cycle.
Page 26 Page 26
Once completed the timed portion of the freezing Electronic Controls & Sensors ON OFF
cycle the system goes automatically into the Evaporator Sensor ................................. •
defrost cycle which has also a pre-fixed length. At Condenser Sensor ................................. •
completion of the defrost cycle the P.C. BOARD •
Ice Level Control ....................................
command the unit to start again a new freezing
cycle.
HARVEST (Water filling portion)
OPERATION - ELECTRICAL SEQUENCE Electrical components (Loads) ON OFF
The following charts illustrate which switches and •
Compressor ............................................
which components are ON or OFF during a Fan Motor (Air cooled only)and TRIAC ......... •
particular phase of the icemaking cycle. •
Hot Gas Valve ........................................
Refer to the wiring diagram for a reference. •
Water Inlet Valve ....................................
Water Drain valve (Not on AC 106) ....... •
P.C.Board Relay 1 & 2 Coil .................... •
BEGINNING FREEZE P.C.Board Relay 3 Coil ............................... •
Water Pump ........................................... •
Electrical components (Loads) ON OFF P.C. Board Timer ................................... •
•
Compressor ...........................................
Fan Motor (Air cooled only) and TRIAC ........ • Electronic Controls & Sensors ON OFF
Hot Gas Valve ........................................ • Evaporator Sensor ................................. •
Water Inlet Valve .................................... • Condenser Sensor ................................. •
Water Drain Valve (Not on AC 106) ....... • •
Ice Level Control ....................................
P.C.Board Relay 1 Coil .......................... •
P.C.Board Relay 2 & 3 Coil .................... •
•
Water Pump ...........................................
P.C.B. Timer ........................................... • OPERATING CHARACTERISTICS
F. P.C. BOARD (Data processor) with ten keys, of one push button, of an external
switches socket of input terminals for the leads of
The P.C. BOARD, fitted in its plastic box located the sensor probes and input and output terminals
in the front of the unit, consists of two separated for the leads of the ice maker electrical wires.
printed circuits one at high and the other at low The P.C. BOARD is the brain of the system and
voltage integrated with two fuses one on power it elaborates, through its micro processor, the
in (32mA) and one on power out (6.3 A), of four signals received from the three sensors in order
aligned LEDS monitoring the operation of the to control the operation of the different electrical
machine, of one extra monitoring RED LED components of the ice maker (compressor, water
(blink 0°C - steady - 15°C), of one DIP SWITCH pump, solenoid valves, etc.).
• Push for more then 5” the machine by-pass TOO HI COND TEMP
the Water Filling Phase TOO HI EVAP TEMP
BIN FULL
RED ALARM LED ON The DIP SWITCH N° 7 and 8 allow the extention
Too hi condensing temperature of the length of the harvest/defrost cycle according
RED ALARM LED BLINKING to their combination as per following chart:
Too hi evaporating temperature
YELLOW FREEZING CYCLE ON
Unit in freezing cycle mode DIP SWITCH ADDITIONAL DEFROST TIME
M. CONDENSER AIR FILTER during the defrost cycle as well as during the
(Air cooled version) water filling phase. During the defrost cycle the
hot gas valve coil is activated so to attract the hot
Located in front of the air cooled condenser can gas valve piston in order to give way to the hot
be removed by withdrawing it through the opening gas discharged from compressor to flow directly
of the front panel for cleaning or replacing. A into the evaporator serpentine to defrost the
lower plastic guide, installed inside the unit, is formed ice cubes.
used for the correct sliding and location of the air
filter.
S. FAN MOTOR (Air cooled version)
N. WATER SPRAY SYSTEM The fan motor is controlled through the P.C.
BOARD and the TRIAC by the condenser tem-
Through its nozzles, the water pumped, is sprayed perature sensor. Normally it operates only during
in each individual cup to be frozen into ice. the freezing cycle to draw cooling air through the
It consists of one spray tube wheve are located condenser fins. In the second part of the freezing
several spray nozzles. cycle, the fan motor can run at intermittance as
the condenser pressure must be kept between
two corresponding head pressure values.
O. WATER PUMP (2 PCS ACS 126-176)
The water pump operates continually throughout
the freezing cycle and on the first 15 or 30 T. COMPRESSOR
seconds of the defrost cycle so to such the The hermetic compressor is the heart of the
remaining water from the sump tank (reach in refrigerant system and it is used to circulate and
mineral salts) and drain it out. During the freezing retrieve the refrigerant throughout the entire
cycle the pump primes the water from the sump system. It compresses the low pressure
to the spray system and through the spray nozzles refrigerant vapor causing its temperature to rise
sprays it into the inverted cup molds to be frozen and become high pressure hot vapor which is
into crystal clear ice cubes. It is recommended then released through the discharge valve.
that the pump motor bearings be checked at
least every six months.
U. HI PRESSURE CONTROL
(AC 106 water cooled version only)
P. WATER INLET SOLENOID VALVE -
3/4 MALE FITTING Used only on the water cooled versions it operates
to keep between 9.5 and 10.5 bars (135 ÷ 150
The water inlet solenoid valve is activated by the psig) the hi-side or discharge pressure of the
micro processor of the P.C. BOARD during the refrigerant system by energizing the coil of the
first 5 minutes of water filling phase as well as water inlet solenoid valve that control the cooling
during the defrost cycle. When energized it allows water flow to the condenser.
a metered amount of incoming water to flow over
the evaporator cavity to assist the hot gas in
defrosting the ice cubes. The water running over V. WATER REGULATING VALVE - (Not on
the evaporator cavity drops by gravity, through AC 106) - (Water cooled version)
the dribbler holes of the platen, into the sump This valve controls the head pressure in the
reservoir where it will be sucked by the water refrigerant system by regulating the flow of water
pump and primed to the spray system. going to the condenser.
As pressure increases, the water regulating val-
ve opens to increase the flow of cooling water.
Q. WATER INLET SOLENOID VALVE -
3/4 MALE FITTING (AC 106 water cooled
version only) W. WATER DRAIN SOLENOID VALVE
A special water inlet solenoid valve with one inlet (Not on AC 106)
and two outles (one for condenser and the second The water drain solenoid valve, electrically
for the production of ice) is used on water cooled connected in parallel to the water inlet and to the
version. An automatic hi pressure control activates hot gas solenoid valves, is energized for all the
the second coil of the water inlet solenoid valve length of the defrost cycle. By means of the water
so to supply a metered amount of water to the pump, that remains energized for 15 seconds at
condenser and drop down its temperature and the beginning of the defrost cycle, it allows the
pressure. 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
R. HOT GAS SOLENOID VALVE ice maker to make every new freezing cycle with
The hot gas solenoid valve consists basically in new fresh water, avoiding thereby the
two parts: the valve body and the valve coil. accumulation of sediments and scales, which
Located on the hot gas line, this valve is energized soon or later will cause the partial or total clogging
through the micro processor of P.C. BOARD of the water system on the unit.
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ADJUSTMENT PROCEDURES
WIRING DIAGRAM
AC 106-126-176-206-226 AIR AND WATER COOLED 230/50-60/1
The unit is shown on freezing cycle
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WIRING DIAGRAM
ACS 126-176 AIR AND WATER COOLED 230/50-60/1
The unit is shown on freezing cycle
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SERVICE DIAGNOSIS
Unit will not run Blown power in fuse in P.C.Board Replace fuse & check for cause of
(No warning LEDS glows) blown fuse
(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
(Red-alarm LED-LIGHT glows) High head pressure 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 LED + Red-alarm LED glows) Condenser sensor out of order Replace it
and Red-alarm Light blinks twice
and repeat
(Freezing LED + Red-alarm LED blinks) Evaporator sensor out of order Replace it
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
SERVICE DIAGNOSIS
Shortage of water Water spilling out through curtain Check or replace curtain
Irregular cubes size & some Some jets plugged Remove jet cover and clean
cloudy
Shortage of water See shortage of water
Cubes too large Freezing cycle too long Review setting of DIP SWITCH keys
Capillary tube partially restricted Blow charge, add new gas & drier,
after evacuating system with
vacuum pump
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
SERVICE DIAGNOSIS
Hot gas valve not opening Valve coil with open winding
Replace valve
Water solenoid valve not opening Valve coil with open winding
Replace valve
Excessive water in unit base Water tubing leaking Check. Tighten or replace
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D. CLEANING/SANITISING INSTRUCTIONS 6. Lift up the entire spray platen from its bottom
OF WATER SYSTEM seat and take it out to clean it separately.
Cleaning
9. Prepare the cleaning solution by diluting in
a plastic container two liters of warm water (45°-
50°C) with 0,2 liters of Ice Machine Cleaner.
BUTTON for more then 2" and less of 5" to put the Sanitation
machine in cleaning mode.
NOTE. Sanitation of the water system is
NOTE. With the system in CLEANING/ recommended to be done once a month.
RINSING mode the water pump is the only
component in operation to circulate the 16. Prepare in a plastic container the sanitation
cleaning solution in the entire water system solution as per manufacturer dilution using warm
while the three leds of the PC Board are water (45-50 °C).
blinking (Fig. 8).
NOTE. Never mix the cleaning with the
sanitising solution.
12. Let the unit to remain in the CLEANING
mode for about 20 minutes then unplug again the 17. Follow the procedures as per cleaning (from
machine. item 10 to item 13) just shorting the operation of
the water pump to 10 minutes.
NOTE. The amount of Cleaner and the time
needed for the cleaning of water system 18. Place again the evaporator cover and the
depends of the water conditions. unit service panels.
15. Switch ON again the machine. The water 20. Wipe clean and rinse the inner surfaces of
pump is again in operation to circulate the water the storage bin.
in order to rinse the entire water system.
Do the operation as per steps 13 and 14 twice so REMEMBER. To prevent the accumulation of
to be sure no more traces of descaling solution undesirable bacteria it is necessary to sanitize
remains into the sump. every week the interior of the storage bin.
FIG. 8
- EVAPORATOR
16
WATER IN VALVE
DIP 7
- CONDENSER SWITCH 8
COMPRESSOR
DATA
RELAYS 3
Rx Tx
BIN
4
13
FAN MOTOR
L 1 TRIAC 5
6
N 2 TRANSF.
WATER PUMP
RELAY 11
12
ELECTRONIC CARD