To the owner or user: The service manual you are reading is intended to provide you, and
the maintenance or service technican, with the information needed to install, start up, clean
and service this ice system.
Scotsman Ice Systems are designed and manufactured with the highest regard for safety and performance.
They meet or exceed the standards of UL and NSF.
Scotsman assumes no liability or responsibility of any kind for products manufactured by Scotsman that have
been altered in any way, including the use of any parts and/or other components not specifically approved by
Scotsman.
Scotsman reserves the right to make design changes and/or improvements at any time. Specifications and
designs are subject to change without notice.
December, 1987
Page 1
Page 3
CS55: FOR THE INSTALLER
Prior consideration for the location shall
include:
• Indoors, with a minimum room
0
temperature of 50
room temperature of 100
F. and a maximum
0
F.
• Water temperature to the machine
0
should be between 40
•
Service Access. Allow enough space at
the back of the cabinet for the utilities to
be connected. Allow enough space for
the machine to be pulled out from its
IF BUILT IN, THIS SIDE SHOULD BE
TIGHT AGAINST THE PANEL TO
PREVENT AIR RECIRCULATION
F. and 1000F.
Location:
installed location. Do not build a floor
in front of the machine that would
prevent its removal.
• Air circulation: The front panel MUST
remain unobstructed. Do not block with
any type of door or curtain.
If the unit is built in, it will pull air in from
the right side of the front panel, and
exhaust it out the left side of the front
panel. If the left side of the machine is left
open, warm air will be discharged from the
left side panel.
WARM AIR DISCHARGE
December, 1987
COOL AIR INTAKE
Page 2
Page 4
CS55 INSTALLATION
WATER FILTER
(FIELD SUPPLIED)
ELECTRICAL, WATER, AND DRAIN
FOR THE PLUMBER
Water supply and drain connections.
1. The recommended water supply line is a
1/4" o.d. copper tube, the water pressure
must have a minimum incoming pressure
of 20 psig.
2. Connect the tubing to the 3/4" hose
coupling thread water inlet fitting at the
back of the icemaker. An optional adaptor
to go from the 3/4" hose coupling thread to
1/4" compression fitting is available from
your dealer under part number 0533238.
Or a similar adaptor can be purchased
from a hardware store.
POWER
SUPPLY
POWER CORD
3. Install a shut off valve in the incoming
water line near the icemaker so that the
water can be shut off for service.
4. Connect a gravity drain line to the drain
connection at the icemaker. A minimum
slope of 1/4" fall per foot of horizontal run
is recommended. Install the drains per the
local codes.
A vent is recommended on the highest
point of the drain tube, and the drain tubing
must be rigid pipe. Do NOT use flexible
tubing.
LEVEL THE UNIT
WATER SUPPLY
SHUT OFF
VALVE
DRAIN
ELECTRICAL
1. Locate the nameplate on the lower rear
panel and check that the location source
voltage and capacity are correct for this
unit. The unit is equipped with a grounded
plug connection.
Under no circumstances must the ground
post be altered or removed.
Extension cords are not permitted.
ADAPTOR
(FIELD SUPPLIED)
Be certain that the icemaker is connected
to its own electrical circuit and is
individually fused. The maximum allowable
voltage variation should not exceed ten
percent of the nameplate rating.
All external wiring should conform to
the National, State, and local electrical
code requirements. Usually an electrical
permit and the services of a licensed
December, 1987
Page 3
Page 5
CS55: INSTALLATION
1. Is the Cabinet level?
2. Have all the electrical and piping
connections been made?
3. Has the voltage been tested and
checked against the nameplate rating?
4. Is the unit plugged into a separate
electrical circuit?
5. Is the water supply line shut off valve
installed and is the water turned on?
6. Have the bin interior, and the cabinet
exterior been wiped clean?
POWER?
FINAL CHECK
7. Are all internal parts in place, including
the spray platform and curtain?
8. Have the internal refrigerant lines been
checked for rubbing and chaffing?
9. Has the machine been installed where it
is indoors, in a controlled environment, with
adequate air circulation around the
machine, and where it can be serviced?
LEVEL?
DRAINS?
WATER?
December, 1987
Page 4
Page 6
CS55 INITIAL START UP
1. Open water supply valve.
2. Move electrical breaker or switch to the
on position.
3. Remove front panel.
4. Check the cube size control shaft, it
should be in a preset cube size position. If
not, turn it clockwise until the unit comes
on. Note: cube size adjustments may be
required. Start with the shaft in the "mid"
position.
5. The machine will go thru a "dry" cycle,
this will take about 10 minutes. Then the
water fill and harvest cycle will begin.
6. Observe the water fill cycle:
• The water inlet valve opens.
• Incoming water flows from the valve
through the tubing to the top of the
icemaker.
• Water flows around the inverted ice
cube cups and drains through holes into
the reservoir.
• The reservoir begins to fill up with water.
• Extra water flows thru the purge valve
for 15 seconds and then the fan and
pump will stop.
• Water continues to enter the machine
and overflows a standpipe in the
reservoir and down the drain.
1
This will take about 2
the freeze cycle will begin.
7. Check the operation of the freezing cycle:
⁄2 minutes. After that
• Compressor is running.
• Water pump is spraying water through
the spray nozzels.
• Icemaking begins, the water gets very
cold, and ice begins to form in the cube
molds.
8. Check that the plastic curtain assembly
hangs down evenly in the opening and that
no large streams of water are passing
through.
December, 1987
Note: Some water will drip from the
reservoir as the machine runs. This is
normal.
9. After about 20 minutes the machine will
begin to release the ice, this is called the
harvest cycle.
Observe the first cube harvest:
• Check the size of the ice cubes.
Note: The normal size of the ice cube has
a 1/4" depression in the wide end.
If the cubes are not filled out, adjust the
machine to make larger ice cubes by
turning the cube size control shaft
clockwise.
If the cubes are overfilled, adjust the
machine to make smaller ice cubes by
turning the cube size control
counter-clockwise.
In both cases, the next cycle of cubes
harvested must be observed, and further
corrections may be needed. See page 11.
If the ice cubes are cloudy, an extreme
water condition may exist. Confirm that
they are cloudy by placing them in a glass
of cold water. If, in the water, they remain
cloudy, you may want to have the water
tested by a water treatment specialist.
If the ice cubes are cloudy only on the
bottom or in the center, the machine may
be running out of water before the end of
the freezing cycle.
10. Test the bin full shut off. To test this,
hold some ice on the bin thermostat
bracket (the stainless steel tube on the left
side of the ice storage bin). The icemaker
should stop within a few minutes of having
ice on that tube.
11. Fill out the Warranty Registration and
Customer Evaluation form, and mail both
to Scotsman.
12. Make sure the user understands the
operation and maintenance requirements
for the icemaker. Leave the service
manual and the name of the local
Scotsman service agency with the user.
Page 5
Page 7
CS55 COMPONENT LOCATION
CUBESIZE
&
ON/OFF
BIN
THERMOSTAT
EVAPORATOR
RESERVOIR
FILL TUBE
SPRAY PLATFORM
RESERVOIR
OVERFLOW TUBE
JET CAP
SPINNER DISC
WATER PUMP
WATER RESERVOIR
BIN LEVEL
CONTROL TUBE
HOT GAS
VALVE
WATER INLET
VALVE
COMPRESSOR
CLEANING SWITCH
December, 1987
Page 6
BIN DRAIN
CONTROL
BOX
Page 8
CS55 HOW IT WORKS:
COMPONENT DESCRIPTION
Cube Size Control
The cube size control is located in front of
the control box, behind the front panel.
The sensing capillary tube of the cube size
control is routed out of the control box into
its bulb holder on the evaporator coil. It is
a reverse acting temperature control with
double throw contacts. Turning its knob all
the way counterclockwise also shuts off the
icemaker.
The control determines the length of the
freezing cycle and correspondingly the size
of the cube. A lower setting will produce a
smaller cube, and a higher setting will
make a larger cube. The cube size control
changes its contacts when the evaporator
reaches its preset temperature, starting the
harvest cycle. When the sensing tube of
the cube size control reaches the high
preset temperature, the contacts change
again, restarting the freeze cycle.
Compressor Toggle Switch.
The compressor toggle switch is located on
the side of the control box. When moved
to the ON position, it makes a circuit to the
compressor. When moved to the OFF
position, the other components will still
operate.
Water Pump
The water pump operates during the
freezing cycle only, pumping water through
the spray nozzles into the inverted spray
cups.
Inlet Water Solenoid Valve
The water solenoid valve, located in the
back panel of the unit, is energized only
during the harvest or cleaning cycles.
When energized it allows a metered
amount of water to flow into the machine
(.21 g.p.m.) This water flows to the top of
the evaporator and then down into the
reservoir.
Water Purge Drain Valve
The purge valve opens during the harvest
cycle, and when the pump is on, water
from the pump discharge is diverted to the
drain. This flushes out the reservoir.
Bin Thermostat Control
The bin thermostat control body is located
in front of the control box just beside the
cube size control. The thermostat sensing
tube is located in the ice storage bin on the
left side wall where is automatically shuts
the icemaker off when the bin is full and
restarts when ice is removed. Factory
settings are 1 degree C (36 degrees F) cut
out and 4 degrees C (39 degrees F) cut in.
It can be adjusted by turning the
adjustment screw visible through the
control box cover.
Hot Gas Valve Assembly
The hot gas valve assembly is comprised
of two parts, the valve body and the coil.
These parts are located on the discharge
line of the compressor and are activated by
the cube size control (harvest cycle).
When the coil of the hot gas valve is
energized, it magnetically lifts the plunger
in the hot gas valve body. This allows hot
refrigerant gas to by-pass the condenser
and go directly to the evaporator.
Spray Platform and Chute
The spray system used on this unit is of
the stationary type. The water is forced by
the water pump into the platform chamber
and sprayed into the inverted cup molds
through a set of six spray nozzles.
Fan Motor
The fan motor is electrically connected
through the cube size control and runs only
during the freezing cycle.
Hermetic Motor Compressor
The compressor is a vapor pump, forcing
refrigerant gas throughout the refrigeration
system.
Page 9
DRAINS
CS55: HOW IT WORKS:
Freezing cycle
The refrigeration process creates cold
temperatures within the evaporator coils
and removes heat from the water sprayed
up into the inverted ice cube cups. When
enough heat is removed, the water
changes into ice, and forms where it is the
coldest: in the ice cube cups.
Minerals contained in the supply water will
not freeze and are drained away. Mostly
pure water will be frozen into the ice cubes.
WATER
During the freezing cycle, the compressor,
fan motor, and water pump are operating.
Water is continuously freezing or being
sprayed and recirculated. When
evaporator temperature is lowered to the
cold temperature setting of the cube size
control, it ends the freezing cycle and
starts the harvest cycle.
Harvest cycle
WATER TO EVAPORATOR
Harvest cycle
The cube size
WATER
SPRAY
control
thermostat also
closes the circuit
WATER PUMP,
ON DURING
FREEZE
to the solenoid
of the hot gas
valve and the
solenoid of the
inlet water valve.
INLET WATER
VALVE, OPEN
DURING
HARVEST
The hot gas
valve opens and
hot refrigerant
gas is
discharged into
the evaporator.
The inlet water
valve opens and
a fresh supply of
water flows to
the top of the
evaporator and
then drains into
the reservoir.
The ice cubes
are released
from the inverted cube cups in the
evaporator by the warming effect of the hot
refrigerant gas condensing in the
evaporator tubing, plus the incoming water
flowing around the inverted cups. The
released ice cubes drop onto the spray
platform and
through the
curtain assembly
into the ice
storage bin.
The cube size
control thermostat
senses the
warmer
temperatures of
the harvest cycle,
and at a preset
temperature,
opens the circuit
to the solenoid of
the hot gas valve,
and the inlet water
valve. Both
valves close,
incoming water
stops and hot gas
is diverted back to
the condenser.
The harvest cycle
is complete, and
the freezing cycle
restarts.
The automatic icemaking process
continues until the bin is full of ice, and the
bin thermostat senses a colder
temperature.
The bin thermostat then opens the circuit to
all components and the automatic
icemaking process stops.
December, 1987
Page 8
Page 10
CS55 HOW IT WORKS:
REFRIGERATION
FREEZE CYCLE
The ice cubes are formed in an inverted
mold that is refrigerated.
The refrigeration process begins at the
compressor. There, refrigerant vapor is
compressed and flows from the
compressor through the discharge line as
a high temperature, high pressure gas. In
the discharge line there is a strainer with
two outlets, one leads to the condenser,
and one to a solenoid valve. Because the
solenoid valve is closed, the gas flows to
the condenser, where heat is transferred
from the refrigerant to the air passing
through the condenser. The refrigerant then
condenses into a high pressure liquid.
From the condenser, the liquid refrigerant
flows through the liquid line, and the liquid
line filter-drier. After the filter drier, the
liquid refrigerant enters the metering
device, a capillary tube. After passing the
restriction of the capillary tube, the
refrigerant enters an area of relative low
pressure, the evaporator. In the tubing of
the evaporator, the liquid refrigerant
expands and evaporates, absorbing heat
from the evaporator tubing and anything in
contact with it such as water sprayed
against it.
The refrigerant, now a low pressure, low
temperature vapor, flows into the
accumulator, which traps excess liquid
refrigerant. The vapor, now primarily a gas,
goes through the suction line tube to the
compressor where the cycle is repeated.
EVAPORATOR
CAPILLARY TUBE
DISCHARGE LINE
SUCTION
LINE
ACCUMULATOR
CONDENSER
LIQUID
LINE
STRAINER
FILTER-DRIER
COMPRESSOR
December 1987
Page 9
Page 11
CS55 HOW IT WORKS:
REFRIGERATION
HARVEST CYCLE
(When the cubes are released)
The ice cubes have been formed in an
inverted mold that was refrigerated.
Now the refrigeration system will change to
warm the cube mold and release the cubes.
The process begins at the compressor.
There, refrigerant vapor is compressed and
flows from the compressor through the
discharge line as a high temperature, high
pressure gas. Before the gas gets to the
condenser,it goes through a strainer, the
strainer outlet is connected to two tubes,
one of which leads to an electric valve, the
hot gas solenoid. When this valve opens,
the refrigerant gas follows the path of least
resistance and flows through the tubing
from the hot gas valve to the evaporator,
where the ice cubes are frozen.
At the evaporator, the high temperature
gases are cooled by the cold temperatures
of the cube mold, and condense into liquid,
transferring heat to the mold which warms
up and releases the cubes.
The refrigerant, now a low pressure, low
temperature vapor, flows into the
accumulator, which traps excess liquid
refrigerant. The vapor, now primarily a gas,
goes through the suction line tube to the
compressor where the cycle is repeated.
EVAPORATOR
CAPILLARY TUBE
DISCHARGE LINE
SUCTION
LINE
ACCUMULATOR
CONDENSER
LIQUID
LINE
STRAINER
FILTER-DRIER
COMPRESSOR
Page 12
CS55 OPERATION & ADJUSTMENT:
OPERATING CHARACTERISITCS
The information shown below covers a wide range of air and water temperatures. It is intended as a guideline only, and is based on data compiled from NEW CLEAN units. Allow a
variation from each end of the range given.
A. Refrigeration system pressures:
High Side (discharge)
End of Freeze cycle........... 100-130 psig
Harvest cycle (maximum) .. 150-190 psig
Low side (suction)
End of Freeze cycle...........3-5psig
Harvest cycle (maximum) .. 60-75 psig
ADJUSTMENT OF THE CUBE SIZE:
Adjust only when cubes are too big or
small.
(See the illustration at the right.)
1. Remove front panel, locate knob.
2. To increse the size, turn knob 1/8 turn
clockwise. To make the cubes smaller, turn
the knob 1/8 turn counterclockwise.
3. Observe the size of the cubes in the
next two harvest cycles, if more adjustment
is needed, continue adjustments until the
correct size is obtained.
B. Freeze cycle time...............15-30 minutes
C. Defrost cycle time..............2- 3 minutes
D. Compressor amps
Freeze cycle .......................3.3 to 3.5
Harvest cycle......................6.3 to 6.7
CORRECT SIZE
ADJUSTMENT OF THE BIN
THERMOSTAT CONTROL
Adjust the bin thermostat when the ice
maker turns off too soon (ice level low) or
when it turns off too late (ice storage bin
overfills.)
To increase the ice level in the storage bin:
Rotate the bin thermostat adjustment
screw (located under front panel on control
box cover) clockwise one eight turn at a
time until the ice level that the machine
maintains is correct.
To decrease the ice level in the storage bin:
Rotate the bin thermostat adjustment
screw counterclockwise one eight turn at a
time until the ice level is correct.
December, 1987
Page 11
TOO SMALL, LITTLE OR NO ICE IN
THE CENTER OF THE CUBE.
TOO BIG, THICK BULGE OF SOLID
ICE ON THE END.
Page 13
CS55 MAINTENANCE AND CLEANING
A Scotsman Ice System represents a sizable investment of time and money in any
company’s business. In order to receive the best return for that investment, it MUST receive
periodic maintenance.
It is the USER’S RESPONSIBILITY to see that the unit is properly maintained. It is always
preferable, and less costly in the long run, to avoid possible down time by keeping it clean;
adjusting it as needed; and by replacing worn parts before they can cause failure. The
following is a list of recommended maintenance that will help keep the machine running with
a minimum of problems.
Maintenance and Cleaning should be scheduled at a minimum of twice per year.
General
The periods and procedures for
maintenance and cleaning are given as a
guide. Cleaning will vary depending upon
local water conditions and the amount of
ice used. Each icemaker must be
maintained individually, in accordance with
its own requirements.
Icemaker
The following should be scheduled at least
two times per year on this icemaker. Call
your local Scotsman Service Agency.
1. Shut off water supply to the icemaker.
2. Disconnect the water inlet tube from the
connection at the back of the icemaker,
and check the screen at that point. If very
dirty, carefully pull the screen out and clean
it. Reassemble water line to icemaker.
3. Open the water shut off valve.
4. Unplug the power cord to disconnect
electrical power to the icemaker.
5. Remove the front panel.
6. Clean the air-cooled condenser fins using
a vacuum, whisk broom, brush, or if
needed, coil cleaner. The icemaking
capacity of this machine is reduced by a
dirty condenser coil.
7. Remove the ice from the bin.
8. Remove curtain by pulling forward on the
left end, and then pulling the curtain to the
left and out of the machine.
9. Lift up spray platform, locate stand pipe
to the right of the opening, and pull it out to
drain the reservoir. Replace the standpipe,
spray platform, and curtain.
10. Mix approximately 3 ounces of
Scotsman Ice Machine Cleaner with 1.5
quarts of hot tap water, and pour this
solution into the reservoir at the curtain
base.
11. Plug the icemaker back in, and allow it
to operate for at least 20 minutes. Then
switch the cleaning toggle switch to the
"cleaning" position for about three minutes
to release all the ice cubes from their cups.
13. Switch the cleaning toggle switch to the
"operation" position, and allow the machine
to run for 30 minutes or until all the acid
taste is gone from the ice being produced.
14. Pour hot water into the bin to melt the
ice produced during cleaning, and to clean
out the drain. Wipe the interior of the bin
with mild soap and hot water, rinse with
cold water.
Caution: Do not use the ice produced
during cleaning, as it may have a strong
acid content.
Disconnect ice machine from electrical
power before proceeding.
/////////////////////////////////////////////////////////////////////
Bin Thermostat
1. Unplug the icemaker to disconnect
electrical power.
2. Remove screws and cabinet front panel.
3. Remove screws and control box cover,
disconnect electrical wires from bin
thermostat control.
4. Dismount bin thermostat from the control
box
5. Remove rear panel.
6. Pull bin thermostat capillary line from
tube in ice storage bin. Remove complete
control from ice machine.
7. Replace with new control in reverse
order of removal.
gain access to the cube size control body.
Remove screws and dismount cube size
control from control box. Disconnect
electrical wires from cube size control.
4. At the top of the machine, unclip cube
size thermostat tube holder from
evaporator, (retain clips and tube
assembly.) Pull cube size control capillary
tube from the tube, and remove complete
cube size control from the ice maker.
5. Insert capillary tube on new thermostat
into tube holder, be sure that the end caps
are in place.
6. Reverse the removal procedures to
reinstall the cube size control. Adjust as
needed.
Refrigeration System
Any time the refrigeration system is
CLIPS
PLASTIC TUBE
INSTALL BETWEEN
CUPS
CAP, SEAL
WITH FOOD
GRADE
SEALANT
EVAPORATOR
CUBE SIZE CONTROL
Cube Size Control
1. Unplug the icemaker to disconnect
electrical power.
2. Remove screws and cabinet top, front,
and rear panels.
3. Pull knob from cube size control shaft.
Remove screws and control box cover to
opened, the drier must be replaced, the
system evacuated and the exact charge
measured into the system. Any other
procedure is NOT CORRECT, and will
result in substandard performance.
Page 17
CS55 REMOVAL AND REPLACEMENT
INLET WATER
VALVE
Spray Platform and Spray Jets
1. Open ice bin door.
2. Pull out on the left side and remove
curtain assembly.
3. Lift the spray platform up and pull out to
get to the water hose at the base of the
platform.
4. Pull hose off of connection to spray
platform, and pull platform from ice maker.
5. Unscrew nozzle caps from the spray
platform, check for spinner discs, clean or
replace the spinners.
6. To replace, reverse the removal
procedures.
ELECTRICAL
CONNECTIONS
WATER PUMP
ASSEMBLY
CURTAIN
WATER PUMP COVER
PULL OUT
Water Inlet Valve
1. Unplug the icemaker to disconnect
electrical power.
2. Shut off water supply to icemaker.
3. Remove the lower back panel, pull out to
expose inlet water valve.
4. Disconnect electrical wires from inlet
water valve.
5. Disconnect water lines to and from water
valve.
6. Remove valve from icemaker.
7. Reverse removal procedure to replace.
Water Pump
1. Disconnect ice maker from electrical
power.
2. Remove top panel.
3. Open ice bin door pull up through top
and remove.
4. Remove curtain by pulling forward and
out on the left end..
5. Pull out spray platform, and disconnect
hose.
6. Remove screw from water pump cover.
7. Pull top of water pump cover forward,
and then pull water pump up and out of ice
maker.
8. Dismount water pump from cover
assembly, and remount the replacement
pump in its place, including water
discharge hose.
9. Reverse the balance of the steps to
reassemble.
December, 1987
Page 16
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