Scotsman ACM 25 Service Manual

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SERVICE MANUAL

MANUALE DI SERVIZIO

ACM 25

VERSIONE R 134 A / R 404 A

Home ice cuber
Fabbricatore di

ghiaccio a cubetti

domestico

090088.41 - REV. 03/2002

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TABLE OF CONTENTS PAGE

TO THE USER 3
USER’S INFORMATIONS

- INTRODUCTION 4
DESCRIPTION

• Sealed Refrigeration System 4

• Self contained Storage Bin 4

• Removable water reservoir 4
SPECIFICATIONS 5
OPERATIONS BEFORE UNIT

START-UP 6
OPERATING INSTRUCTIONS

• Start-up 6

• Cleaning and Care 8
PRINCIPLE OF OPERATIONS

• Freezing cycle 10

• Harvest cycle 10

INDICE PAGINA

PER L’UTILIZZATORE 20
INFORMAZIONI PER L’UTILIZZATORE

- INTRODUZIONE 21
DESCRIZIONE

• Sistema refrigerante 21

• Contenitore del ghiaccio 21

• Bacinella dell’acqua amovibile 21
SPECIFICHE TECNICHE 22
OPERAZIONI DA EFFETTUARE

PRIMA DELL’AVVIAMENTO 23
ISTRUZIONI DI FUNZIONAMENTO

• Avviamento 23

• Pulizia e manutenzione 25
PRINCIPIO DI FUNZIONAMENTO

• Ciclo di congelamento 27

• Ciclo di sbrinamento 27

SERVICEMAN’S INFORMATIONS

- GENERAL 11

• Service Diagnosis 11

• Wiring Diagram 13

• Adjustment & Removal & Replacement

• Procedure 14

PARTS ILLUSTRATIONS AND
PARTS LIST ACCESSORIES 15

COMPRESSOR AND ELECTRIC
COMPONENTS CHART 19

INFORMAZIONI TECNICHE

- PREMESSA 28

• Servizio analisi 28

• Schema elettrico 30

• Procedure per la rimozione e la

• sostituzione dei vari componenti 31

ILLUSTRAZIONI ED ELENCHI
DELLE PARTI DI RICAMBIO ED
ACCESSORI 32

COMPONENTI DEL COMPRESSORE
ED ELETTRICI 36

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TO THE USER

Page 3

Your SCOTSMAN model ACM 25 Ice Maker is a
product carefully engineered and quality
constructed to provide you with many years of
faithful performance and a minimum of
maintenance costs.
Produced by the world’s leading manufacturer of
automatic ice making equipments, your
SCOTSMAN ICE CUBE MAKER incorporates
the same reliable systems already proven over
years of actual operation by thousands of users.
Many of you will have an opportunity to see and
use clear, slow melting SCOTSMAN CUBERS
for the first time.

You will quickly compare the clear, glass-like
quality of your Scotsman Cubes to the type
produced by your home refrigerator, freezer.
By comparison, cubes made in trays in your
refrigerator are very white or cloudy, they also
melt faster than clear ice.
Take the time now to review this manual and you
will see why Scotsman Cubes are solid and
clearer than ice cubes of your refrigerator.

No installation is required

Easy access for service is provided by the prompt
removal of the front panel and/or the cabinet.

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USER'S INFORMATIONS

INTRODUCTION

This manual provides the specifications and the
step-by-step procedures for the start-up and
operation and, the maintenance and cleaning for
the SCOTSMAN Model ACM 25 Automatic Ice
Cube Maker.
The ACM 25 Automatic Cubers are quality
designed, engineered and constructed and
throughly, tested ice making and ice storage
systems, providing the utmost in flexibility to fit
the needs of particular users.
Separate sections detail more specifically:
General Informations & Start-up Operation;
Principles of Operation; Adjustment and Removal
and Replacement Procedures; Maintenance &
Cleaning Instructions; Service Diagnosis; Wiring
Diagrams; and the illustrated Assemblies, Parts
List & Accessories.
One of the outstanding features of this series of
cubers is the easy way for starting it up.
Since it does not require any plumbing connection,
it can be placed in any location and put in
operation.

REMOVABLE WATER RESERVOIR

The most exclusive feature of the ACM 25 consists
in having a removable water sump reservoir. It
can be easily removed at any time to be washed
clean.
A water level indicator is provided on the front of
the reservoir alloving prompt visual inspection of
water level into reservoir.
A special funnel in comunication with the water
reservoir allows prompt and easy filling of water
reservoir itself without the need to remove it.

∂

∏

∑

DESCRIPTION

An attractive compact cabinet of textured plastic
with an almond enamel finish, makes the styling
of the ACM 25 very handsome allowing it to be in
harmony with many interior decors. The easy
removable front panel provides immediate access
to the water reservoir and to the electro­mechanical components.

SEALED REFRIGERATION SYSTEM

The compressor is fully hermetic and its motor is
internally spring-mounted to ensure quiet and
efficient operation of the Ice Maker.
The refrigerant circuit is entirely sealed to prevent
mishandling and refrigerant leaks.

SELF CONTAINED STORAGE BIN

The ACM 25 ICE MAKER stores its own ice
supply in a properly insulated ice storage bin.
A sensing bulb of a thermostat keeps automatic
control of the stored ice cubes level.
A sliding (recessing) plastic door located in the
upper front of the cabinet gives ample access to
the storage bin.

π

∫

bin recessing door

∂

ice storage bin

∑

water vessel

∏

water level indicator

π

front panel

∫

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SPECIFICATIONS

AIR COOLED MODELS

Kg.

11

10

9

8

7

6

ICE PRODUCED PER 24 HRS.

5

35 30 525 20 15 10

AMBIENT TEMPERATURE

• Dimensions = m/m 380 wide-380 deep-640 high

• Weight = 29 kg (64 Ibs.)

• Cabinet = Plastic

• Finish = Enamel

• Color = Almond

• Storage bin = ABS

• Door = Sliding (recess)

• Power Requirements = 230 Volts, 50 Hz, 1 Phase

• Power Consumption = 4,5 Kwh x 24 HRS

• Wire Size = 1 m/m

2

• Fuse Size = 6 Amps

• Compressor = 1/5 HP

• Refrigerant metering

device = Capillary

• Refrigerant Charge = 220 grms FREON, R 134 A

• Harvest Means = Hot gas

o

°C

• Cubes per harvest = 8

• Storage bin capacity = 3.5 Kgs. (7.7 Ibs.)

• Water reservoir capacity = 4 liters (1.1 gl.)

°C
°F

NOTE.

When machine is “built-in” at ambient temperature of 32°C (90°F) indicated ice capacity
decreases about 10%.
To keep your SCOTSMAN CUBER performing at its maximum capacity, it is necessary to perform
periodic maintenance as outlined on page 8 of this manual.

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OPERATIONS TO PERFORM
BEFORE UNIT START-UP

1) After unpacking the unit, visually inspect its
exterior and make sure it does not show any
severe damage.

2) Remove Lower Compartment Panel and
inspect for concealed damage; then check if fan
blades move freely, and if compressor is snug on
all mounting pads.

OPERATING INSTRUCTIONS

START-UP

1) Locate on left side, in storage bin
compartment the funnel for pouring the water.

2) Through this funnel pour in unit water
reservoir 4 liters of fresh potable water.

3) Open the bin door and remove any
wrappings or adhesive tape that may be inside,
as well as the instruction card attached to the
control knob.

4) Use clean damp cloth or disposable paper
wiper to wipe clean the interior surface of ice
storage bin.

5) Place ice maker in its selected permanent
location and make sure that it is properly levelled.

NOTICE:

shall include:
a) Minimum room temperature 10°C

(50 degrees F); and maximum room tempe­rature 35°C (95 degrees F)

b) Well ventiled location for efficient air
removal around the unit and maintain proper
condensing operation.

c) Service Access i.e. adequate space for
prompt service inspections.

6) Check that the location source voltage
corresponds with the voltage specified on the
nameplate of the unit.

Prior consideration for location site

3) Check to see through the water level glass
the water level obtained. (Must not exceed the
maximum level line and not below minimum level
line).

WARNING: The location power source
must have a solid earth wire connection.

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4) Plug the electric cable into the appropriate
socket. Make sure that the indicator on the control
knob is pointing to the “white dot”. The machine
is now working and the first cooling cycle can
begin.

5) The first freezing cycle will last about 35
minutes. During this time, make sure that the
plastic curtain that covers the water spray system
hangs down loose and no excessive water is
passing through, make sure to eliminate
eventually noises and vibration sources.

6) After about 35 minutes of operation, the
first ice cubes harvest takes place.

7) During the harvest cycle, which lasts about
3 minutes, the hot gas, circulating through the
evaporator serpentine, defrosts the ice cubes up
to the point that they are released from their mold
cups and drop into the storage bin.

8) If the tem-

perature of the
room in which the
machine is place
is below 20°C, the
cubes will tend to
be partly hollo­wed out (see fig.
on right).

If, on the other
hand, the room
temperature is
above 30°C the
cubes produced
will have a jagged
rim of ice around
the crown.

9) If it is thought necessary, the above
situations can be remedied by, in the first case,
turning the control knob indicator (as little or as
much as is required) to the left of the white
marker and, in the second case, turning the knob
to the right. It should, however, be remembered
that if the room temperature returns later to the
20 ÷ 30°C range, the knob indicator must once
again be turned to point to the white dot. (see fig.
below).

10) The ice maker will automatically stop when
the ice cubes in this storage bin compartment
cover the sensing bulb of the bin thermostat and
will automatically start when the same sensing
bulb will be cleared from the ice.

11) Remember to fill up the water reservoir
before the water level in it goes below the minimum
level line of the indicator.
In any case, if for some reason the machine is left
running for a short time without water, no serious
harm will be caused.

Page 8

CLEANING AND CARE

WARNING - Before proceeding with
any cleaning operation make sure that
the power line of the unit is discon­nected.

WATER RESERVOIR AND STORAGE
BIN LINER

All commercial units that make or contain edible
produces, require a frequent throught sanitation
of all their parts that are in contact with the
produces.
It is recommendable, therefore, to perform the
cleaning and disinfecting operation once a week
as per the following indications.

Page 8

- Remove all ice cubes deposited in ice storage
bin if there are any.

- Remove the front lower panel by pulling it
from its upper edge and locate the water
reservoir.
Place one hand under the reservoir in order to
hold it and with the other grab the hooked front
edge.

- Slightly move the reservoir upward until it is
loose, than lower and tilt it a bit while
drawing out (try to avoid the pump body in
doing this).

- Make this reservoir empty and then place it back
in the unit.

- In a separate plastic pan, prepare a solution with
two liters of water and one full spoon of chlorine
water (hypochlorite).

- Pour the prepared solution into the storage bin
compartment than wipe clean its interior,
meanwhile the solution flows down into the
reservoir.

- Connect the power line and put in operation the
unit for few minutes. The bleaching solution will
be circulated by the pump through the water
pipes and nozzles.

PUMP INLET SCREEN

While the water reservoir is removed, it is
recommendable to clean the water pump inlet
screen.
Pull it down with gentle pressure and wash it
clean under a stream of tap water. Once the
screen is properly cleaned reposition it in its
original place on the pump body.

- Disconnect the power line, remove again the
plastic reservoir, make it empty then re-fit it in its
place.

- Pour through the funnel the necessary quantity
of new fresh water until the maximum water
level in the water reservoir is reached.

- The until is now sanitized and can resume
normal operations.

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AIR COOLED CONDENSER

It is very important to clean the condenser
regularly. A dirty or blocked condenser, will
drastically reduce ice production.
Use a vacuum cleaner to remove dust from the
front of the condenser.

CABINET EXTERIOR

Clean with warm water. Do not apply wax.

Note.

When cleaning the floor in the imme­diate front the unit, try to do not move much
dust that could be easily sucked inside the
units through the panel louvers.
Eventually, for few seconds, you can place
in front of the louvers a piece of paper or
cardboard to prevent that the brushed
dust panetrates into the machine
compartment.

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PRINCIPLE OF OPERATION

In the Scotsman ACM 25, the water to make ice
is continually moved or circulated by a small
electric pump that sprays the water under gentle
pressure through the two spray jets into the eight
inverted cube molds.
Part of the water that hits the cold refrigerated
molds freezes, building gradually into full ice
cubes bell shaped.

FREEZING CYCLE (How it works)

The hot gas refrigerant, pumped and discharged
by the compressor, passes through the condenser
where the fan blowing air causes the changing of
it into liquid.
The liquid line takes the refrigerant from the
condenser to the capillary tube. During the travel
into the capillary tube, the liquid refrigerant looses
gradually its temperature and pressure, then it
reaches the evaporator coils.
Because of the water sprayed against the
evaporator molds and coil, the liquid refrigerant
senses the heat of this water and starts boiling,
changing, as a consequence, from liquid into
vapor state.
The vapor refrigerant is sucked back to the
compressor through the suction line.
The freezing cycle is controlled by a temperature
control which determines as well the length of the
cycle and consequently the size of the ice cube.
During this phase, the contact point of the tempe­rature control maintains closed the circuit of the
water pump which constantly sprays the water
under the evaporator mold cups up to the point
that the ice cubes reach their full size.

∑

∑

WATER CIRCUIT

∂

∏

π

① EVAPORATOR

≠ BIN

∫

③ SPRAY TUBE
④ WATER PUMP

∞ WATER RESERVOIR

FREEZING CYCLE

∂

① EVAPORATOR

≠ ACCUMULATOR

③ CAPILLARY TUBE
④ SUCTION LINE

∞ COMPRESSOR
± HOT GAS SOLENOID

∏

❻

± VALVE CLOSED

≤ CONDENSER
≥ FAN MOTOR

⑨ DRIER

π

❼

∫

❾

Ω

HARVEST CYCLE (How it works)

As soon as the temperature control senses the
temperature in the evaporator corresponding to
the full size cubes, the contact moves to close the
circuit of the Hot Gas Valve Coil and consequently
to open the circuit of the water pump which
momentarily stops.
The hot gas refrigerant discharged by the
compressor is now diverted through the opened
hot gas valve to the evaporator coil.
The hot gas circulares through the evaporator
coil raising the temperature around the cube
cups sufficiently to release the ice cubes.
The released ice cubes drop by gravity into the
storage bin.
The temperature control bulb, due to the warm
temperature in the evaporator moves again the
contact de-energizing the hot gas valve and
energizing the water circulating pump starting a
new freezing cycle.

∑

π

∏

HARVEST CYCLE

❻

❾

∂

① EVAPORATOR

≠ ACCUMULATOR

③ CAPILLARY TUBE
④ SUCTION LINE

∞ COMPRESSOR
± HOT GAS SOLENOID

± VALVE OPENED

≤ CONDENSER
≥ FAN MOTOR

⑨ DRIER

❼

Ω∫

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SERVICEMAN’S INFORMATIONS

GENERAL

perature.
It gradually pulls down to 7 atm at the end of the

Models ACM 25 Ice Cube Makers have been
designed for little service and maintenance
requirements.
Average head pressure is 10 atm at the start-up
of the freezing cycle at 21°C ambient tem-

cycle.
Suction pressure at the start-up of the freezing
cycle will be around 3 atm then it pulls down
gradually to approximately 0 atm at the end of
freezing cycle.

SERVICE ANALYSIS

The following Service Analysis Section is for use in aiding the serviceman in diagnosing a particular
problem for pin-pointing the area in which the problem lies, thus an ever available reference for proper
corrective action.

SYMPTOM POSSIBLE CAUSE CORRECTION

Machine does not make ice. Fuse in Power Line Blown. Check fuses in the house fuse

box. Other loads on the same
line may have caused fuse
to blow. Use a 10 amp circuit

and fuse.
Water reservoir empty. Re-fill water reservoir.
Temp. control out of setting. Check for proper setting.
Wiring broken or connection off. Check electrical circuitry.
Compressor does not run. Any of the following may be

Water pump not operating. Clean or replace pump.
Bin thermostat not operating Check thermostat by warming

correctly. with hand and cooling with ice

Restricted Capillary Tube. Purge and recharge.
Moisture and air in system. Purge - recharge - replace drier.
Shortage of refrigerant. Charge unit properly.

Low ice capacity. High Room Temperature. Provide ventilation to the unit.

High head pressure. Dirty condenser. Clean.

the cause. Starting relay,

overload, or defective compressor.

cube. Replace if necessary.

Decrease temperature as much

as possible.

Cubes too large. Cube Size Control set Check and adjust for proper

improperly. operation.