CU50
Service Manual
Introduction:
This ice machine is the result of Scotsman’s
decades of experience as an industry leader in the
design and manufacture of both commercial and
residential ice machines.
This manual includes the information needed to
install, start up, maintain and service the ice
machine. Note any Caution or Warning indicators,
as they provide notice of potential hazards. Keep
this manual for future reference.
Table of Contents
Specifications .......................................... Page 2
Cabinet Layout ......................................... Page 3
Air flow ............................................. Page 4
Water Quality .......................................... Page 5
Door Covering .......................................... Page 6
Door Panel Attachment ..................................... Page 7
Custom Panel .......................................... Page 8
Door swing change ....................................... Page 9
Installation: Water & Drain ................................... Page 10
Gravity Drain .......................................... Page 11
Electrical ............................................ Page 12
Cube Size Adjustment ..................................... Page 13
Harvest Time Adjustment .................................... Page 14
Control Settings ......................................... Page 15
Use ............................................... Page 16
How to clean the condenser and winterize. ........................... Page 17
How to remove scale from the ice making system. ....................... Page 18
System Information ....................................... Page 19
Water System .......................................... Page 20
Components .......................................... Page 21
Controller ............................................ Page 22
Performance Information .................................... Page 23
Refrigeration System ...................................... Page 24
Thermistor Values ........................................ Page 25
Service Diagnosis ........................................ Page 26
Service Diagnosis ........................................ Page 27
Removal and Repair ...................................... Page 28
Removal and Repair ...................................... Page 29
Removal and Repair - Cabinet Removal ............................ Page 30
Refrigeration Service ...................................... Page 32
March 2010
Page 1
CU50
Service Manual
Specifications
This ice machine is designed to be used in a
controlled environment. It can be used in a wide
variety of environmental conditions and under
limited conditions (see user manual), outdoors, but
there are limits. Use outside of the listed limitations
is misuse and will void the warranty.
Air temperature limits:
The ice machine will operate adequately within the
limits, but functions best in temperatures between
70 and 80 degrees F.
Minimum – 50 degrees F. (10oC)
•
Maximum – 100 degrees F. (38oC)
•
Water temperature limits:
Minimum – 40 degrees F. (4.5oC)
•
Maximum – 100 degrees F. (38oC)
•
Water pressure limits:
Minimum – 20 psi (1.4 bar)
•
•
Maximum – 80 psi (5.5 bar)
Options:
Kickplate Extension
levelers will be extended enough to become visible.
A kit to extend the kickplate over the legs is KKPF.
Cabinet Stability
installations it may be prudent to add a bracket that
secures the back of the cabinet to a wall. That kit
number is KATB.
Drain Conversion:
A gravity drain model can be converted to a drain
pump model by installing a drain pump kit. The
drain pump kit consists of a drain pump, wiring
harness and associated tubing. The kit number is
A39462-021.
Warranty Information
Warranty information is supplied separately from
this manual. Refer to it for coverage. In general, the
warranty covers defects in materials or
workmanship and does not cover corrections of
installation errors or maintenance.
: In some situations the leg
: In some free standing
Because the ice machine is making a food product,
the water supply to the ice machine must be
potable, or fit for human consumption.
Electrical
•
115 volt, 60 Hz. Plug into dedicated 15 amp
circuit.
•
Power consumption: 275 - 400 Watts. Varies
during Freeze and Harvest cycles.
Voltage limits:
•
Minimum - 104 volts
•
Maximum – 126 volts
Models: There are two models, all air cooled:
•
CU50PA-1 – Pump model
•
CU50GA-1 – Gravity drain model
March 2010
Page 2
CU50
1.00
LEG
ADJUSTMENT
[25.40]
14.88
377.95
AIR OUT AIR IN
3.88
98.55
17.45
443.23
FLOOR DRAIN
AC CESS HOLE
34.38
873.25
3.85
97.79
29.66
753.24
22.29
566.17
23.89
606.68
1.60
40.51
3.20
81.28
3.27
82.99
2.44
62.04
1.57
39.75
7.44
188.98
3.83
97.16
115V
PO WERCORD
PO TAB LEWATER INLET
1/4"COMPRESSION FITTING
DRAIN
FLEXIBLETUBING
3/8 I.D.PUMP MODEL (INCLUDED)
5/8 I.D.GRAVITY MODEL (NOTINCLUDED)
Service Manual
Cabinet Layout
March 2010
Page 3
CU50
Service Manual
Air flow
The machine takes in room temperature air at the
lower right front and forces warm air out the lower
left front. Restricting the airflow will adversely affect
the ability of the ice machine to make ice.
Control Panel
Warm Air Out
Scotsman Ice Systems are designed and
manufactured with the highest regard for safety
and performance. They meet or exceed the
standards of agencies like U.L.
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.
Air Intake
Ice Making
Area
Scotsman reserves the right to make design
changes and/or improvements at any time.
Specifications and designs are subject to change
without notice.
March 2010
Page 4
CU50
Service Manual
Water Quality
All water, including potable water supplied by
municipalities, contains some impurities or
minerals. Water absorbs impurities from the air as
rain and/or as it flows through the ground. Some of
the impurities are solid particles, these are known
as suspended solids, and a fine particle filter will
remove them. Other impurities are chemically
bonded to the water molecules, and cannot be
filtered out, these are called dissolved solids.
Ice made by this machine will have a lower mineral
content than the water it was made from. This is
due to the method of making ice. Purer water will
freeze first in the ice making molds. The reason for
this is that anything dissolved in water lowers the
water’s freezing temperature. This concentrates
most of the impurities in the ice machine water
reservoir where they may form hard deposits
known as scale. The machine dilutes the
concentration of minerals by over-filling the
reservoir during the harvest cycle (with the excess
water flowing down the drain). Between 2 and 4
pints of water flow into the unit each cycle.
Between 1 and 3.5 pints of that rinses the reservoir
and goes down the drain.
Some impurities will inevitably remain, and will stick
to the parts in the machine, and will cause
malformed ice cubes. Eventually, built up mineral
scale can shorten machine life.
Filters and Treatment
In general, it is always a good idea to filter the
water. A water filter, if it is of the proper type, can
remove taste and odors as well as particles. Some
methods of water treatment for dissolved solids
include reverse osmosis, and polyphosphate
feeders.
RO Water
This machine can be supplied with Reverse
Osmosis water, but the water conductivity must be
no less than 10 microSiemens/cm. A reverse
osmosis system should include post treatment to
satisfy the R.O. water’s potential aggressiveness.
Deionized water is not recommended and is too
clean to allow the machine to function.
Because water softeners exchange one mineral for
another, softened water may not improve water
conditions when used with ice machines. Where
water is very hard, softened water could result in
white, mushy cubes that stick together.
If in doubt about the water, contact a local point of
use water specialist for recommendations on water
treatment.
Installation Overview
To keep the machine operating properly, these
impurities or minerals will have to be regularly
dissolved by an acid cleaning, using Scotsman Ice
Machine Scale Remover. Directions for this may be
found in the section under cleaning.
March 2010
Page 5
The ice machine must:
•
be connected to cold, potable water
•
be connected to a drain
•
be connected to the proper power supply
•
be able circulate air through the vents at the
front.
Note: Do not build in so that the door is recessed.
CU50
Service Manual
Door swing change
The door can be attached to open with hinges on
the left or right. Retain all screws for re-use.
To change:
1. Remove top hinge pin from hinge.
6. Remove original bottom hinge.
7. Remove two plugs or screws from upper
cabinet bracket.
8. Attach bottom hinge to upper cabinet bracket
using the original screws.
2. Tilt top of door away from cabinet and lift door
off bottom hinge.
3. Remove two screws and top hinge.
9. Place the door on bottom hinge, tip up to slide
under top hinge.
10. Insert hinge pin into top hinge and door.
11. Tighten hinge pin.
12. Replace screws or plugs into holes left by
hinges.
13. Check action and swing of door.
4. Remove plugs or screws from lower cabinet
bracket
5. Attach top hinge to lower cabinet bracket using
original screws.
March 2010
Page 6
CU50
Service Manual
Installation Notes
Sealing to floor: In some cases the base of the ice
machine must be sealed to the floor to meet local
code. Food grade silastic sealant such as
Scotsman part number 19-0529-01 is
recommended.
Place the machine in the intended location. Turn
the leg levelers in until the bottom of the unit is as
close to the floor as possible. Be sure the unit is
level and all four levelers are in contact with the
floor.
Place a bead of the sealant between the floor and
the outside edge of the cabinet. The bead must fill
the space between the cabinet bottom edges and
the floor.
Built In Situations: If a finished floor is to be
installed in the area after the ice machine has been
built in, shims the expected thickness of the floor
should be installed under the unit to keep the
machine level with the planned floor level.
Installations on a slab: Use a pump model and
pump the water to the point of drainage. Pump
models will pump 1 story (10 feet) high.
Installations over a crawl space or basement:
Either gravity drain or pump model units may be
used, if there is not enough room behind the
machine for a drain/waste receptacle, the drain will
have to be below the floor.
Note: When installed in a corner, the door swing
may be limited due to handle contact with the wall
or cabinet face.
March 2010
Page 7
CU50
Service Manual
Installation: Water & Drain
The recommended water supply tubing is ¼ inch
OD copper. Stainless steel flex or reinforced PVC
tube may also be used. Install an easily accessible
shut-off valve between the supply and the unit. This
shut-off valve should not be installed behind the
unit.
Note: Do not use self-piercing type valves.
1. Remove the front service panel.
Screw
Securing
Front Service
Panel
Drains
There are two types of ice machine models, one
that drains by gravity and one that has an internal
drain pump.
Drain Pump Model drain installation
1. Locate the coil of 3/8” ID plastic drain tubing
secured to the back of the unit.
2. Route the plastic drain tube from the back of the
unit to the drain connection point.
IMPORTANT NOTE: Often an air gap is required by
local codes between the ice maker drain tube and
the drain receptacle.
2. Route the tubing through the right hole in the
back to the inlet water solenoid valve inlet.
3. Install a compression fitting on the tubing and
connect to the inlet of the solenoid.
Drain Tube,
Route to
building drain
Water Inlet
Tube (field
supplied)
Back View, Drain Pump Model
March 2010
Page 8
CU50
Service Manual
Gravity Drain
Caution: Restrictions in the drain system to the
machine will cause water to back up into the ice
storage bin and melt the ice. Gravity drain tubing
must be vented, have no kinks and slope to the
building drain. Air gaps are typically required by
local code.
1. Place the ice machine in front of the installation
opening. Adjust leveling legs to the approximate
height.
2. Remove the front service access panel and the
upper back panel.
Note: If you are connecting a gravity drain model
and the drain opening has been located in the floor
under the base pan according to the pre install
specifications, follow steps 3 through 5 to drain the
unit through the base. If not, proceed to step 6b.
3. Remove the clamp and barbed elbow and take
off the plastic cover in the base pan below the drain
hose.
4. Connect a straight 5/8” barbed connector to the
drain hose, securing with the clamp removed in
step 4.
5. Cut an 8” piece of 5/8” ID X 7/8” OD tygon (clear
plastic) tubing. Slide one end of the tube onto the
outlet of the barbed connector and secure with a
clamp. Leave the other end of the tube lying on the
floor of the base pan until the unit is positioned
over the floor drain.
6. Route the drain tube. Either a) Insert the drain
tube through the base pan into the floor drain or b)
Route the drain tube through the left hole in the
lower back panel and connect to barbed elbow and
secure with a clamp.
7. Reinstall the upper back panel.
8. Reinstall the service access panel. Level the
unit.
Drain Hose
Drain Hose,
Route to
building drain
Barbed Elbow
Water Inlet
Tube (field
supplied)
Back View, Gravity Drain Model
March 2010
Page 9
CU50
Service Manual
Electrical
The ice machine is supplied with a power cord. Do
not remove the grounding pin from the cord’s plug.
Do not use extension cords. Follow all codes.
Connect the machine to its own 115 volt, 15 amp
circuit.
1. If the electrical outlet for the ice maker is
behind the unit, plug in the unit.
2. Position the unit in the installation opening.
3. Turn on the water supply. Make sure that the
ice maker is plugged in and the power is on.
4. Slide unit into installation opening, paying
careful attention to water supply and drain
connections. Do not kink!
5. Pour a couple of quarts of water into the ice
storage bin; on drain pump equipped machines
the drain pump should start and water should
pump out. Check for leaks.
6. Replace the service access panel.
7. Level the unit as needed.
Installation check list:
1. Has the unit been connected to the proper
water supply?
2. Has the water supply be checked for leaks?
3. Has the unit been connected to a drain?
4. Has the drain been tested for flow and leaks?
5. Has the unit been connected to the proper
electrical supply?
6. Has the unit been leveled?
7. Have all packing materials been removed from
the machine?
8. Has the door covering been installed?
Initial Start Up
1. Turn on the water supply.
2. Switch on the electrical power.
3. Push and release the On/Off switch to start the
machine. The Ice Making light next to the
On/Off switch will glow Green.
Water will begin to flow into the unit. When the
4.
reservoir is full, water will start to drain from the
machine. After a few minutes the compressor,
water pump and fan motor will begin to operate
and the first ice making cycle will have begun.
No adjustments are needed.
After about a half hour, ice will fall into the ice
storage bin. The machine makes 24 cubes per
batch. It is normal for the first batches of ice to
melt, that continues until the bin has cooled. It will
take 8 to 10 hours of continuous run time to fill the
ice bin. When the bin is full of ice, the ice machine
will shut off. It will automatically restart when the
ice level falls, either from use or normal meltage.
March 2010
Page 10
CU50
Service Manual
Cube Size Adjustment
The cube size can be adjusted by changing the
amount of freeze cycle time. This is done by a
button press sequence.
Note: There is only one correct cube size. See the
illustrations.
To adjust cube size:
1. Shut the machine off: If it's off on bin full press
and release the On/Off button once, switching the
Ice Making light off. If the machine is making ice
hold the On/Off button in until the Ice Making light
is off.
2. Press and hold the Clean button for 5 seconds
(light on), then release (light out)
Side Views of Cubes
Too Small, Adjust Cycle Longer
3. View the lights. Compare to the table below.
Cube Size Change Table
On/Off Water Clean
Default off off off
Add 1 minute on off off
Add 2 minutes off on off
Add 3 minutes off off on
Add 4 minutes on on on
- 1 minute flash off off
- 2 minutes off flash off
- 3 minutes off off flash
- 4 minutes flash flash flash
4. Select the amount of change.
5. Push and release the On/Off button until the
correct light pattern is displayed.
Just Right
Too Large, Adjust Cycle Shorter
6. Push and release the Clean button to select that
setting.
7. Push and release On/Off to return to ice making.
March 2010
Page 11
CU50
Service Manual
Harvest Time Adjustment
The harvest time can be adjusted so that all the ice
harvests during the cycle, plus a few seconds
extra. This is done by a button press sequence.
Note: Do not set harvest time shorter than the
actual time it takes to release all the cubes.
To adjust Harvest Time:
1. Shut the machine off by holding the On/Off
button in until it shuts off (Ice Making light off).
2. Press and hold the On button again for 5
seconds, then release (Ice Making light will switch
off).
3. View the lights. Compare to the table below.
Harvest Time Table
On/Off Water Clean
Default off off off
Add 10 seconds on off off
Add 20 seconds off on off
Add 30 seconds off off on
Add 40 seconds on on on
- 10 seconds flash off off
- 20 seconds off flash off
- 30 seconds off off flash
- 40 seconds flash flash flash
4. Select the amount of change.
5. Push and release the Clean button until the
correct light pattern is displayed.
Ice Making
Indicator Light
On - Off
Button
6. Push and release the On button to select that
setting.
7. Push and release On/Off to return to ice making.
Time To
Clean Unit
Indicator Light
Check Water
Indicator Light
Clean - Reset
Button
Control Panel
March 2010
Page 12
CU50
Service Manual
Control Settings
Automatic water purge enable / disable
The control is set at the factory to automatically
select the proper amount of water purge. If desired,
that can be disabled, and a typical purge amount
used.
To disable Automatic purge selection:
1. Press and hold the On/Off button until the unit
shuts off. No lights should be on.
2. Press and hold the ON button for 5 seconds,
then release.
3. Wait between 5 and 20 seconds, then repeat
step 1. All lights will flash once.
To return to Automatic purge selection:
1. Press and hold the ON button for 5 seconds,
then release.
2. Wait between 5 and 20 seconds, then repeat
step 1. All lights will flash twice.
Manual Harvest - from the OFF or Standby Mode
(powered but no lights are on)
1. Press and hold the Clean-Reset button for 5
seconds and release.
2. Wait between 5 and 20 seconds, then repeat
step 1. All lights will flash once. The On/Off light will
be on until harvest has timed out.
Reset time to clean indicator light
Press and hold the Clean-Reset button for 3
seconds.
March 2010
Page 13
CU50
Service Manual
Use
No special instructions are needed for use. Just
take as much ice as you need, the machine will
replace it. A scoop is provided, and it can be stored
in the machine using the loop of tubing on the right
side as a holder.
The machine can be shut off anytime by just
pushing and releasing the On/Off button. The
machine will shut off at the end of the next cycle.
To shut off immediately, push and hold the On/Off
button in until the machine stops.
What shouldn’t be done?
Never keep anything in the ice storage bin that is
not ice. Objects like wine or beer bottles are not
only unsanitary, but the labels can slip off and plug
up the drain.
Never allow the machine to operate without regular
cleaning. The machine will last longer if it is kept
clean. Regular cleaning should happen at least
once per year, and preferably twice. Some water
conditions will dictate even more frequent cleaning
of the ice making section, and some carpets or
pets will dictate more frequent cleaning of the
condenser.
Note: The Time to Clean light will switch ON after 6
months of use. It will remain ON until the ice
making system is cleaned using the process on
page 13.
Noise:
The ice machine is designed for quiet operation,
but will make some noise during the ice making
cycle. During a freezing cycle, it is normal to hear
the fan moving air and the water pump circulating
water. Ice hitting the bin or ice in the bin can be
heard during harvest.
Normal cubes are tapered cylinders. If the cubes
are ragged and mis-shaped, mineral scale must be
removed from the ice making system
Maintenance
There are 5 things to keep clean:
1. The outside cabinet & door.
2. The ice storage bin.
3. The condenser.
4. The ice making system.
5. The ice scoop.
How to clean the cabinet.
Wipe off any spills on the surface of the door and
handle as they occur. If anything spilled on the
door or gasket dries onto the surface, wash with
soap and warm water to remove.
How to clean the ice storage bin.
The ice storage bin should be sanitized
occasionally. It is usually convenient to sanitize the
bin after the ice making system has been cleaned,
and the storage bin is empty.
A sanitizing solution can be made of 1 ounce of
household bleach and two gallons of hot (95
115
interior of the ice storage bin with the sanitizing
solution, pour some of the solution down the drain.
Allow to air dry.
March 2010
Page 14
o
F.) water. Use a clean cloth and wipe the
o
F. –
CU50
Service Manual
How to clean the condenser and winterize.
Condenser cleaning
The condenser is like the radiator on a car, it has
fins and tubes that can become clogged with dirt
and lint. To clean:
1. Remove the kickplate and front service panel.
2. Locate the condenser surface.
Winterizing
1. Clean the ice making system.
2. Open the door and push and release the On/Off
switch to turn the machine off.
3. Turn off the water supply.
4. Drain the water reservoir by removing the rubber
cap under the reservoir - it's near the back wall of
the ice storage bin.
Rubber Cap
3. Vacuum the surface, removing all dust and lint.
Caution: Do not dent the fins.
4. Return the kickplate and front service panel to
their original positions. Fasten them to the cabinet
using the original screws.
5. Disconnect the incoming water line at the inlet
water valve.
6. Open the door, push and release the on/off
switch to turn the machine on.
7. Blow air through the inlet water valve; a tire
pump could do the job.
8. Drain pump models should have about 1/2
gallon of RV antifreeze (propylene glycol) poured
into the ice storage bin drain.
Note: Automotive antifreeze must NOT be used.
9. Switch off and unplug the machine.
March 2010
Page 15
CU50
Service Manual
How to remove scale from the ice making system.
1. Scoop out all of the ice, either discard it or save
it in an ice chest or cooler.
9. Pour a gallon of hot (95
the bin to flush out the drain.
o
F. – 115oF.) water into
2. Press and HOLD the On/off button in for 3
seconds until the Green light goes out.
3. Press and HOLD the both the Clean-Reset and
On/Off buttons for 5 seconds. The Time to Clean
light will blink on and off.
4. Pour 8 ounces of Scotsman Ice Machine Scale
Remover (available from a local Scotsman
Distributor or Dealer) into the ice machine
reservoir.
10. Clean the bin liner of mineral scale by mixing
some ice machine scale remover and hot water,
and using that solution to scrub the scale off of the
liner.
11. Rinse the liner with hot water.
12. Sanitize the bin interior.
13. Replace the ice removed in step 1.
14. Push and release the On/Off button to restart
ice making.
The ice scoop should be washed regularly, wash it
just like any other food container.
5. Operate the machine for about ½ hour.
6. Push and release the On/Off switch. The
machine will begin to flush out the cleaning
solution.
7. Operate the machine for another ½ hour.
8. Push and release the On/Off switch. The
machine will stop the cleaning process.
Pour Scale
Remover Here
March 2010
Page 16
CU50
Service Manual
System Information
Overall:
Refrigerant: 8 oz R-134a
•
Compressor: Hermetic, 1300 BTUH,
•
Condenser: Forced draft
•
Fan blade: 5 blade, 7 inch
•
Evaporator: Inverted, 24 cube cells. Copper
•
cups attached to continuous serpentine
Metering device: Cap tube
•
Defrost method: Hot gas bypass with water
•
assist
Spray method: 6 water jets
•
Water charge: 40 ounces
•
Water valve: 115 volt solenoid, .19 GPM
•
Water fill time: Varies with harvest time &
•
purge setting
Spray pump: Pedestal type.
•
Drain pump: Magnetic drive, controlled by
•
pressure switch
Purge method: Overflow standpipe
•
Control method: Electronic
•
Cycle control: Thermistor + timers
•
• Freeze cycle timer: 10 minutes,+-4
•
Harvest cycle timer: 20 seconds,+-40
•
Cube size adjustment: Freeze timer change.
•
Harvest cycle adjustment: Harvest timer
change
•
Bin control: Thermostat. Opens on
temperature fall, Cut Out: 35 degrees F. Cut
In 45 degrees F. Range is adjustable.
Electrical Components:
•
Compressor
•
Fan motor
•
Spray pump motor
•
Drain pump motor
•
Drain pump switch
•
Inlet water solenoid valve
•
Hot gas valve
•
Transformer
•
Controller
•
Water sensor
•
Thermistor
•
Bin thermostat
Electrical Sequence:
A closed bin thermostat signals to the controller a
need for ice. The controller checks for water, if
water is needed , the controller opens the inlet
water solenoid valve to fill the reservoir. The hot
gas valve is open to equalize the system. When the
reservoir is full, the compressor, fan motor, water
pump are switched on. After 5 seconds the hot gas
valve shuts and ice making begins.
Water is sprayed up into the inverted cup mold. As
the water is cooled and ice begins to form in the
cups, the temperature of the evaporator will fall.
The freeze cycle continues until the temperature of
the thermistor attached to the evaporator outlet
tube falls to about zero degrees F. At that point the
controller starts a freeze cycle timer, whose default
time is 10 minutes. At the end of the freeze cycle's
timed portion the controller switches to the harvest
cycle.
The harvest cycle begins with the controller
stopping the water pump and fan motor. At the
same time it opens the hot gas valve and the inlet
water solenoid valve. The ice is released by the
combination of discharge refrigerant gas entering
the evaporator serpentine and warming up the
copper, plus the inlet water that flows to the
evaporator, floods across the plastic platen to
warm it up and be pre-chilled for the next cycle. Ice
cubes drop individually and harvest continues until
the thermistor attached to the suction line warms
up to about 50 degrees F. At that point a harvest
timer starts, whose default time is 20 seconds. At
the end of that time the harvest cycle ends and the
freeze cycle restarts.
Bin control.
The machine's on and off modes are regulated by a
bin thermostat. The cap tube for the bin thermostat
is in the tube that holds the scoop. The machine
will only begin ice making when the thermostat's
contacts close. If the contacts re-open before the
temperature of the evaporator drops below a preset
point, the machine will stop. If the temperature is
below that point when the contact s open, the
machine will continue through a complete cycle
and stop at the end of the harvest cycle.
March 2010
Page 17
CU50
Service Manual
Water System
The controller uses a Water Sensor to check for
the presence of water in the reservoir and to
measure the conductivity of the water.
The water sensor consists of two stainless steel
probes located in a holder next to the water pump.
The probes sense the conductivity of the water.
The higher the mineral content of the water, the
better it can conduct electricity. The control system
is capable of sensing water as clean as 10
microSiemens/cm.
If the controller cannot sense water and the bin
thermostat is closed the controller will power the
inlet water solenoid valve to fill the reservoir. The
water fill is timed. There is a maximum amount of
time allowed from the time the controller turned on
the inlet water valve until the water sensor signals
to the controller. That time is 2 1/2 minutes. If
water is not sensed within 2 1/2 minutes, the
controller will not proceed with an ice making
cycle. Instead it will blink the Water light and try
filling the reservoir in 20 minutes.
Evaporator
Pump
Reservoir
Drain
Freeze Cycle Water Schematic
Reservoir water dilution
The process of making ice from circulating water
causes the pure water to freeze first, because it
freezes at the warmest temperature. The remaining
water will develop an increasing concentration of
minerals. If that mineral concentration were
allowed to continue, eventually the ice machine
would become coated with mineral scale.
To combat the mineral build up, the reservoir water
is diluted with fresh water every cycle. The
controller adds enough water to fill the reservoir
and extra water to overfill it. The extra water drains
out through the standpipe in the reservoir.
The controller keeps the inlet water solenoid valve
open until the evaporator temperature set point is
reached, plus some extra time. The extra time is
either pre-set or automatically determined by the
controller.
Standpipe
Inlet Water Solenoid Valve
Harvest Cycle Water Schematic
March 2010
Page 18
CU50
Service Manual
Components
Model and
Serial Tag
Location
Scoop and Thermostat Bracket
Evaporator Platen
Control Panel, Bin Light and Curtain
Evaporator and Controller
March 2010
Page 19
Condenser and Bin ThermostatInlet Water Solenoid Valve
CU50
Service Manual
Controller
High
Voltage
Connector
Evaporator
Thermistor
Bin
Thermostat
Comp
Water Sensor
Water
Hot Gas
Fan
Power
Power Supply
Connector
The controller is located at the front of the unit,
under the top panel.
It is powered by a 12 volt transformer. It has 5
indicator lights:
•
Compressor - Light is ON if compressor is
powered
•
Water - Light is ON if inlet water solenoid
valve is powered
•
Hot Gas - Light is ON when Hot Gas Valve is
powered
•
Fan - Light is ON when Fan motor is
powered
•
Power - Light is ON when power is
connected to controller
Control Panel
Ribbon
Control Safeties:
No Water. If the Water Sensor cannot detect
water, and the inlet water solenoid valve has been
on for the maximum fill time, the controller will stop
all action and wait 20 minutes to re-try water fill.
During this time the Check Water light on the
control panel will be blinking,
Maximum Freeze Time. If the freeze cycle should
extend to 60 minutes, the controller will
automatically put the machine into a Harvest cycle.
Maximum Harvest Time. 6 minutes
Time between restarts. After the machine has
operated and then turned off, the controller will not
restart the machine for four minutes.
March 2010
Page 20
CU50
Service Manual
Performance Information
Freeze Cycle, Minutes
100 37-38 36-37 34-35 32-33 31-32 29-30
90 36-37 35-36 33-34 31-32 30-31 28-29
80 36-35 32-33 30-31 28-29 27-28 26-27
Water
Temperature
Harvest Cycle, Seconds
Water
Temperature
70 32-33 28-29 27-28 25-26 23-24 22-23
60 27-28 25-26 24-25 22-23 20-21 19-20
50 20-21 19-20 18-19 17-18 16-17 15-16
40 18-19 17-18 16-17 15-16 15-16 15-16
80 -100 55-60 60-70 70-80 80-90 90-100 110-115
70 - 80 65-75 70-80 75-85 85-95 95-105 115-120
50 - 70 70-80 75-85 85-95 125-135 140-150 160-170
40 - 50 100-120 115-125 130-140 150-170 180-200 210-230
Air Temperature
100 90 80 70 60 50
Air Temperature
100 90 80 70 60 50
Total Cycle, Minutes
100 38-39 37-38 36-37 34-35 33-34 31-32
90 38-39 36-37 35-36 33-34 32-33 30-31
80 37-38 33-34 31-32 30-31 29-30 27-28
Water
Temperature
Ice per cycle: 1 lb
Water drained / cycle: Varies by harvest cycle
length and purge setting. Typical amounts are @
70/50 = 52 oz. @ 90/70 = 13 oz
Compressor amps: 2.6 - 3.2
70 33-34 29-31 28-29 26-27 25-26 24-25
60 29-30 27-28 25-26 24-25 22-23 21-22
50 21-22 20-21 19-20 19-20 19 18-19
40 20-21 19-20 19 18-19 19 19-21
100 90 80 70 60 50
Air Temperature
March 2010
Page 21
CU50
Suction Pressure
-10
0
10
20
30
40
50
60
70
Time
PSIG
Discharge Pressure
50
60
70
80
90
10 0
110
12 0
13 0
14 0
15 0
Time
PSIG
Service Manual
Refrigeration System
March 2010
Page 22
CU50
Service Manual
Thermistor Values
Deg. F · Ohms Deg. F · Ohms Deg. F. · Ohms Deg. F. Ohms Deg. F. · Ohms
0····85325
1
····82661
2····80090
3····77607
4····75210
5····72896
6····70660
7····68501
8····66415
9····64400
10 · · · 62453
11 · · · 60571
12 · · · 58752
13 · · · 56995
14 · · · 55296
15 · · · 53653
16 · · · 52065
17 · · · 50529
18 · · · 49043
19 · · · 47607
20 · · · 46217
21 · · · 44872
22 · · · 43571
23 · · · 42313
24 · · · 41094
25 · · · 39915
26 · · · 38774
27 · · · 37669
28 · · · 36600
29 · · · 35564
30 · · · 34561
31 · · · 33590
32 · · · 32649
33 · · · 31738
34 · · · 30855
35 · · · 30000
36 · · · 29171
37 · · · 28368
38 · · · 27589
39 · · · 26835
40 · · · 26104
41 · · · 25395
42 · · · 24707
43 · · · 24041
44 · · · 23394
45 · · · 22767
46 · · · 22159
47 · · · 21569
48 · · · 20997
49 · · · 20442
50 · · · 19903
51 · · · 19381
52 · · · 18873
S3 · · · 18381
54 · · · 17903
55 · · · 17439
56 · · · 16988
57 · · · 16551
58 · · · 16126
59 · · · 15714
60 · · · 15313
61 · · · 14924
62 · · · 14546
63 · · · 14179
64 · · · 13823
65 · · · 13476
66 · · · 13139
67 · · · 12812
68 · · · 12494
69 · · · 12185
70 · · · 11884
71 · · · 11592
72 · · · 11308
73 · · · 11031
74 · · · 10763
75 · · · 10502
76 · · · 10247
77 · · · 10000
78 · · · 9760
79 · · · 9526
80 · · · 9299
81 · · · 9077
82 · · · 8862
83 · · · 8652
84 · · · 8448
85 · · · 8250
86 · · · 8056
87 · · · 7868
88 · · · 7685
89 · · · 7507
90 · · · 7333
91 · · · 7164
92 · · · 6999
93 · · · 6839
94 · · · 6683
95 · · · 6530
96 · · · 6382
97 · · · 6238
98 · · · 6097
99 · · · 5960
100 · · 5826
101 · · 5696
102 · · 5569
103 · · 5446
104 · · 5325
105 · · 5208
106 · · 5093
107 · · 4981
108 · · 4872
109 · · 4766
110 · · 4663
111 · · 4562
112 · · 4463
113 · · 4367
114 · · 4273
115 · · 4182
116 · · 4093
117 · · 4006
118 · · 3921
119 · · 3838
120 · · 3757
121 · · 3678
122 · · 3601
123 · · 3526
124 · · 3452
125 · · 3381
126 · · 3311
127 · · 3243
128 · · 3176
129 · · 3111
130 · · 3047
131 · · 2985
132 · · 2924
133 · · 2865
134 · · 2807
135 · · 2751
136 · · 2696
137 · · 2642
138 · · 2589
139 · · 2537
140 · · 2487
141 · · 2438
142 · · 2390
143 · · 2343
144 · · 2297
145 · · 2252
146 · · 2208
147 · · 2165
148 · · 2123
149 · · 2082
150 · · 2042
151 · · 2003
152 · · 1965
153 · · 1927
154 · · 1890
155 · · 1855
156 · · 1819
157 · · 1785
158 · · 1752
159 · · 1719
160 · · 1687
161 · · 1655
162 · · 1624
163 · · 1594
164 · · 1565
165 · · 1536
166 · · 1508
167 · · 1480
168 · · 1453.
169 · · 1427
170 · · 1401
171 · · 1375
172 · · 1350
173 · · 1326
174 · · 1302
175 · · 1279
176 · · 1256
177 · · 1234
178 · · 1212
179 · · 1190
180 · · 1169
181 · · 1149
182 · · 1129
183 · · 1109
184 · · 1090
185 · · 1071
186 · · 1052
187 · · 1034
188 · · 1016
189 · · 998
190 · · 981
191 · · 965
192 · · 948
193 · · 932
194 · · 916
195 · · 901
196 · · 885
197 · · 871
198 · · 856
199 · · 842
200 · · 828
201 · · 814
202 · · 800
203 · · 787
204 · · 774
205 · · 761
206 · · 749
207 · · 737
208 · · 724
209 · · 713
210 · · 701
211 · · 690
212 · · 679
213 · · 668
214 · · 657
215 · · 646
216 · · 636
217 · · 626
218 · · 616
219 · · 606
220 · · 597
221 · · 587
222 · · 578
223 · · 569
224 · · 560
225 · · 551
226 · · 543
227 · · 534
228 · · 526
229 · · 518
230 · · 510
231 · · 502
232 · · 495
233 · · 487
234 · · 480
235 · · 472
236 · · 465
237 · · 458
238 · · 451
239 · · 444
240 · · 438
241 · · 431
242 · · 425
243 · · 419
244 · · 412
245 · · 406
246 · · 400
247 · · 394
246 · · 389
249 · · 383
250 · · 377
March 2010
Page 23
CU50
Service Manual
Service Diagnosis
No Ice
Problem Likely Cause Probable Solution
No power to unit Power disconnected
No power to controller Transformer open Replace transformer
Shut down on maximum
water fill time - water light
flashing
Very long freeze cycle
Water shut off Restore water supply
Water leak Check curtain, sump
Dirty condenser Clean condenser
Restricted location, intake air too
hot or blocked
Evaporator thermistor not sensing
properly
Spray jets dirty
Inlet water valve leaks through
during freeze
Low on refrigerant Check cube formation,
Connected to hot water
Check breaker or fuse. Reset or
replace, restart and check
Eliminate restriction, have machine
moved
Check thermistor
Remove spray platform and clean
spray jets
Check inlet water valve
Check for bleed thru from / missing
check valve in building water
supply
Cannot make ice
Spray pump not pumping Check pump motor
Fan motor not turning
Pump hose disconnected Check hose
Very low on refrigerant
Compressor not operating
Hot gas valve leaks through during
freeze
Compressor inefficient
Check fan motor, check fan blade,
check controller for voltage output
Add access valve, add refrigerant
as a test. If unit makes ice, find and
correct leak.
Check compressor start
components, check PTCR
resistance and temperature
Check compressor voltage
Check compressor windings
Check hot gas valve for hot outlet
during freeze
Check compressor amp draw, if
low and all else is correct, change
compressor
March 2010
Page 24
CU50
Service Manual
Service Diagnosis
Makes excessive noise
Problem Likely Cause Probable Solution
Fan blade vibrates
Compressor vibrates Mounting loose Check mounting
Water pump vibrates Pump bearings worn Replace pump
Panels vibrate Mounting screws loose Tighten screws
Makes ice, does not harvest
Problem Likely Cause Probable Solution
Ice wrong size Environment changed Adjust cube size
Little heat to evaporator
Makes poor quality ice
Blade is bent Replace fan blade
Fan motor mount is broken Replace motor mount
Check voltage to coil when unit is
Hot gas valve does not open
Water temperature very low Adjust harvest time
Fan motor does not stop Check voltage, replace controller
in harvest, check controller
indicator light.
Problem Likely Cause Probable Solution
Spray pattern poor Spray jets dirty Clean jets
Runs out of water Water leaking from reservoir Correct leak
High TDS water supply Groundwater supply Treat water
Makes ice, but melts rapidly
Problem Likely Cause Probable Solution
Restricted drain Gravity drain hose has air block Check for kinks or traps
Pooled water in bin
Pump model switch not starting
pump
Check / replace switch
March 2010
Page 25
CU50
Service Manual
Removal and Repair
Bin Thermostat
1. Disconnect electrical power.
Electrical Shock
Hazard.
Disconnect electrical
power before
beginning removal
2. Remove service panel.
3. Remove back panel.
Note: If unit is built in it must be pulled out to
change the bin thermostat.
4. Pull cap tube out from the back of the ice
storage bin and cap tube holder.
5. Remove two screws and the bin thermostat
contact section from its mounting bracket.
9. Reverse to reassemble.
Curtain
1. Shut unit off.
2. Loosen both thumbscrews holding curtain
bracket to freezing chamber.
3. Pull out and remove curtain with bracket from ice
machine.
4. Reverse to reassemble.
Spray Platform
1. Remove curtain.
2. Lift spray platform up until it disconnects from its
fitting.
3. Pull forward and remove from the ice machine.
4. Reverse to reassemble.
6. Disconnect two wires from the bin thermostat
contact section and remove the thermostat from
the ice machine.
7. Reverse to reinstall.
Inlet Water Solenoid Valve
1. Disconnect electrical power.
2. Remove service panel.
3. Shut water supply OFF.
4. Disconnect inlet water supply tube from inlet
water solenoid valve.
5. Unplug wire harness from valve coil.
6. Remove two screws holding valve to chassis.
7. Squeeze hose clamp larger and push away from
solenoid valve outlet.
Water Pump
1. Remove spray platform
2. Remove back panel.
Note: If unit is built in it must be pulled out to
change the water pump.
3. Disconnect power and ground wires from pump
motor.
4. Rotate pump body CW and lift up to remove it.
5. Reverse to reassemble.
8. Pull hose from outlet of valve.
March 2010
Page 26
CU50
Service Manual
Removal and Repair
Evaporator Thermistor
Note: If unit is built in it must be pulled out to
change the evaporator thermistor.
Electrical Shock
Hazard.
Disconnect electrical
power before
beginning removal
1. Shut machine off. If unit was making ice,
manually harvest the ice.
2. Disconnect electrical power.
3. Remove top panel.
4. Remove cover from controller box.
5. Disconnect thermistor wire from controller.
6. Locate thermistor sensor, it is attached to the
suction line, just above the accumulator and is
covered with insulation tape. Remove the
insulation.
5. Remove screws holding transformer to controller
box and pull transformer up and out of the ice
machine.
6. Reverse to reassemble.
Controller
Note: If unit is built in it must be pulled out to
change the controller.
1. Disconnect electrical power.
2. Remove top panel
3. Remove controller box cover.
4. Unplug all connections.
5. Remove screws holding controller to housing,
and lift controller from unit.
Note: To avoid damaging the controller, touch the
metal chassis of the unit prior to touching the
replacement controller.
6. Reverse to reassemble.
Control Panel
7. Disconnect sensor bulb from suction line (it's
held on with a metal clip).
8. Remove thermistor from ice machine.
9. Reverse to reassemble. It is very important that
the bulb be re-insulated.
Transformer
Note: If unit is built in it must be pulled out to
change the transformer.
1. Disconnect electrical power.
2. Remove top panel.
3. Remove controller cover.
4. Unplug leads from transformer.
March 2010
1. Disconnect electrical power.
2. Remove top panel
3. Remove controller box cover.
4. Unplug ribbon cable connection.
5. Push control panel away from the front of the
machine. Begin at the ribbon cable attachment
point.
Note: Control panel is held on by adhesive and the
adhesive is thinnest at the cable point.
6. Separate control panel from controller box and
remove from the ice machine.
7. Reverse to reassemble.
Page 27
CU50
Service Manual
Removal and Repair - Cabinet Removal
Certain components require the removal of the
cabinet for repair access.
1. If the machine is in a freeze mode, perform a
manual harvest.
2. Remove all ice.
3. Drain reservoir.
4. Remove service panel and kick plate.
5. Remove back panel.
6. Disconnect electrical power.
Electrical Shock
Hazard.
Disconnect electrical
power before
beginning removal
12. Remove curtain & hanger.
13. Locate elbows where water flows onto the
evaporator platen.
Clip
Inlet
Elbow
7. Disconnect water and drain tubing.
8. Remove door.
9. Remove top panel.
10. Remove controller box cover.
11. Disconnect thermistor from controller, pull wire
back to suction line.
Thermistor
Connector
14. Pull clip up. Push inner elbow back and rotate it
until it points straight up, then push it back through
the hole in the back of the freezing compartment.
Inlet
Elbow
Inner
Elbow
15. Pull water inlet elbow out of inner elbow.
March 2010
Page 28
CU50
Service Manual
18. Remove two screws holding freezing
compartment brace to cabinet, lift brace up.
Brace
23. Lift bin assembly off the base.
Note: Prop evaporator assembly up. A 3' length of
3/4" PVC tubing with one end inserted into the cup
mold and the other against the base will hold it up.
The hot gas valve, fan motor, condenser and
compressor are now exposed for service.
19. Lift evaporator platen up and tilt back enough
for bin assembly to clear the base.
Air Baffle
20. Remove air baffle.
21. Unplug 7 wire harness connector (at back of
bin).
22. Remove 1 screw at each corner of the base.
Chassis Shown in Front of Bin Assembly
March 2010
Page 29
CU50
Service Manual
Refrigeration Service
This ice machine use R-134a type refrigerant.
There are specific rules for handling that
refrigerant.
To check for system pressures, add a field supplied
clamp-on type service valve as a temporary means
of system access. After diagnosis and before final
repair, replace the clamp-on type valve with valves
that are brazed onto the process tubes of the
system.
Use a low flow of dry nitrogen when brazing on the
system.
Install a new filter drier when replacing a
refrigeration component or after a refrigerant leak
repair.
Evacuate the system to at least 300 microns and
use a micron gauge to measure the evacuation
level.
Weigh in the nameplate charge. The machine is
critically charged and a partial ounce mis-charge
will affect performance.
March 2010
Page 30
Loading...