IMI CORNELIUS INC g One Cornelius Place g Anoka, MN 55303-6234
Telephone (800) 238-3600
Facsimile (800) 535-4231
Installation/Service Manual
UC 701 SERIES CONTINUOUS–FLOW
ICEMAKER
IMPORTANT:
TO THE INSTALLER.
It is the responsibility of
the Installer to ensure that
the water supply to the
dispensing equipment is
provided with protection
against backflow by an air
gap as defined in
ANSI/ASME A112.1.2-1979;
or an approved vacuum
breaker or other such
method as proved effective
by test.
Water pipe connections
and fixtures directly
connected to a potable
water supply shall be
sized, installed, and
maintained according to
Federal, State, and Local
Codes.
Part No. 630460150
February 2001
Revision Date: November 7, 2003
Revision A
THIS DOCUMENT CONTAINS IMPORTANT INFORMATION
This Manual must be read and understood before installing or operating this equipment
PRINTED IN U.S.A
IMI CORNELIUS INC; 2000–2003
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TABLE OF CONTENTS (cont’d)
Page
UPPER NUT AND BEARING ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18
TO REPLACE BEARING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
ELECTRICAL CHECKOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OVERLOAD CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
COMPRESSOR CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CAPACITOR CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SAFETY CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19
19
19
19
20
24
THE COMPRESSOR WILL NOT RUN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
24
THE COMPRESSOR STARTS BUT TRIPS REPEATEDLY ON THE
OVERLOAD PROTECTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
24
24
25
THE COMPRESSOR RUNS BUT WILL NOT REFRIGERATE . . . . . . . . . . . . . . .
WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LIST OF FIGURES
FIGURE 1. CLEARANCE REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FIGURE 2. ICEMAKER FLOAT ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FIGURE 3. UPPER NUT AND BEARING ASSEMBLY . . . . . . . . . . . . . . . . . . . . . .
FIGURE 4. EXPANSION VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FIGURE 5. ADJUSTMENT SCREW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FIGURE 6. GEARMOTOR ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FIGURE 7. AUGER AND EXTRUDING HEAD REMOVAL . . . . . . . . . . . . . . . . . .
FIGURE 8. SHAFT SEAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FIGURE 9. OVERLOAD CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FIGURE 10. COMPRESSOR CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FIGURE 11. GEAR MOTOR OVERLOAD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FIGURE 12. WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
9
12
15
15
17
17
18
19
19
20
22
LIST OF TABLES
TABLE 1. DESIGN DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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SAFETY INFORMATION
Recognize Safety Information
This is the safety-alert symbol. When you see this
symbol on our machine or in this manual, be alert to
the potentially of personal injury.
Follow recommended precautions and safe operating
practices.
Understand Signal Words
A signal word - DANGER, WARNING, OR CAUTION
is used with the safety-alert symbol. DANGER identi-
fies the most serious hazards.
DANGER
Safety signs with signal word DANGER or WARNING
are typically near specific hazards.
WARNING
General precautions are listed on CAUTION safety
signs. CAUTION also calls attention to safety mes-
sages in this manual.
CAUTION
Follow Safety Instructions
Carefully read all safety messages in this manual and on your machine safety signs. Keep safety signs in
good condition. Replace missing or damaged safety signs. Learn how to operate the machine and how to
use the controls properly. Do not let anyone operate the machine without instructions. Keep your machine in
proper working condition. Unauthorized modifications to the machine may impair function and/or safety and
affect the machine life.
CAUTION: Very high discharges pressure is present in the system. Quick disconnects on
your gages will minimize danger and loss of refrigerant.
CAUTION: The Unit requires a separate electrical line. See Instruction Manual for proper
fuse size.
WARNING: There must be adequate clearance around the Icemaker. Allow 25–inches on the
front side for service access, 4–inches on side opposite the storage bin, and 4–inches on
the back side for air exaust.
NOTE: The Unit must be installed per local plumbing and electrical codes. Failure to do so may cause
damage to the Unit which would void the factory warranty.
NOTE: Using parts other thean genuine factory manufactured parts relieves the manufacturer of all
liability. The manufacturer reserves the right to change specifications at any time.
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GENERAL DESCRIPTION
TO THE USER OF THIS MANUAL
This manual covers the installation and assembly of the Air–Cooled or Water–Cooled Model UC700 Icemaker
with the Model UC150 Dispenser. Refer to Table of Contents for page location of detailed information pertaining
to questions that may arise during installation or operation of this equipment.
DESCRIPTION
The UC700 is a chuncklet Icemaker designed to be installed under a counter adjacent to an Ice Dispenser or an
Ice Storage Bin. The Icemaker will deliver ice to either the left or right side. The Icemaker requires a 12–inch by
12–inch opening at the lower front of the Unit for air intake. A minimum of 1.5 sq. ft. opening must be provided
out the left or right side and the rear of the machine for air exaust.
CLAIMS INSTRUCTIONS
Claims: In the event of shortage, notify the carrier as well as IMI Cornelius immediately. In the event of dam-
age, notify the carrier. IMI Cornelius is not responsible for damage occurring in transit, but will gladly
render assistance necessary to pursue your claim. Merchandise must be inspected for concealed dam-
age within 15 days of receipt.
WARRANTY REFERENCE INFORMATION
Warranty Registration Date
(to be filled out by customer)
Unit Part Number:
Serial Number:
Install Date:
Local Authorized
Service Center:
DESIGN DATA
Table 1. Design Data
Unit Model Number:
UC700–A Series Continuous–Flow Icemaker (Air–Cooled)
UC700–W Series Continuous–Flow Icemaker (Water–Cooled)
Unit Overall Dimensions:
Height
Width
Depth
27 inches
13.7 inches
25.5 inches
Clearances Dimensions Required:
Front Side Service Access (Removable front panel to allow removal of
Unit)
25 inches
Side Opposite Storage Bin for Air Exaust
Rear for Air Exaust
4 inches
4 inches
Weights:
Shipping Weight
184 pounds
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Table 1. Design Data (cont’d)
Water Supply–Water inlet fitting is 1/4–inch SAE flare located at the top front of the Unit. The Unit is designed
to
operate on water pressure between 10 PSI and 90 PSI.
Drain Overflow Line (Located at rear of the Unit)
Ambient Operating Temperature
3/8–inch Flexible Tubing
40° F to 100° F
Electrical:
Unit Electrical Rating
208/230 VAC, 60 Hz, 11.3 Amps,
Single Phase
Recommended Electrical Supply
208/230 VAC, 60 hz, 20 Amps
Dedicated 3–Wire
Grounded Circuit
SPECIFICATION CHART
Refrigerant
Oz. Type
Models
Condensing
Unit
VAC
HZ
PH
Wire
Comp.
RLA
Fan
Amps
GRMTR
Amps
Circuit
Fuse
UC701–A
UC701–W
Air Cooled
Water Cooled
208/230
208/230
60
60
1
1
2
2
7.7
7.7
1.6
N/A
2
2
13
13
R404A
R404A
20
20
UC700
650
600
550
500
450
400
350
90
80
70
60
50
Water Temperature Deg. F
–50 –70 –90 –100
Air Temperature Deg. F
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FIGURE 1. CLEARANCE REQUIREMENTS
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INSTALLATION
PRE–INSTALLATION
Freight Damage Claim
The delivery of your equipment (Frieght Company, Distributor, or dealer) is responsible for loss or damage of
your shipment. All claims must be filed with the deliverer of your equipment. Please follow the steps below to
determine if your shipment is satisfactory or if a claim must be filed:
1. Check the number of products delivered against the number of products listed on the delivery receipt.
Should the totals not match, have the driver note all errors on both copies and both you and the driver sign
and date said notation.
2. Inspect all cartons for visible damage. Open and inspect as required before the driver leaves and have him
or her note any damage on the receipts. All damaged claims must be inspected within 15 days of delivery.
Notify your carrier immediately if concealed damage is found after delivery.
3. Should concealed damage be found when the product is unpacked, retain the packing material and the
product and request an inspection from the deliverer.
4. All claims for loss or damage should be filed at once. Delays in filing will reduce the chance of achieving a
satisfactory resolution to the claim.
Counter
1. A flat and level counter space sufficiently strong to support the weight of the Dispenser and the Icemaker.
The Icemaker may be installed on the left or the right side of the Dispenser.
2. General Requirements:
A. The front of the Icemaker must be free of obstructions.
B. Allow a 4–inch minimum clearance between exaust side of the Icemaker and adjacent equipment.
C. A louvered front panel (12–inches X 12–inches) aligned with the air inlet of the Icemaker and ade-
quate ventilation (1.5 Sq. feet opening) in the counter for exaust air.
D. A removable panel in the counter face (from 2–inches below the top of the counter to the floor, a mini-
mum of 17–inches wide) to allow removal of the Icemaker.
Electrical
Two separate 20 amp, 120VAC, 60 Hz electrical circuits.
Drain
One drain beneath the counter at floor level which will accomodate both the drain from the Icemaker and the
Dispenser.
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INSTALLATION
1. Keep unit in the upright position, remove carton and pallet from the Icemaker and inspect for damage. If
any damage is found, file a claim with carrier immediately.
2. Locate startup card either on outside of container or on plastic liner. Fill in proper information and send one
to factory, and other copy to distributor. Postage is prepaid.
3. Install the Dispenser first, following installation instructions supplied with the Dispenser.
4. Remove the two hole plugs from the side of the dispenser.
A. The plugs are pressed in and sealed with a silastic sealant. To remove pry the outside cap off and
then press the inside plug into the bin. Discard both plugs.
B. Install the icemaker alignment brackets (Supplied with icemaker) to the dispenser (See Figure 2).
5. Install the Icemaker:
A. Install the icemaker alignment brackets (Supplied with icemaker) to the icemaker (See Figure 2).
B. Roll the Icemaker into the cabinet alongside the Dispenser.
C. Level and align the icemaker to the dispenser using the four level adjustment bolts located on the low-
er front of the Icemaker.
D. Install the locking bolt on the lower front of the icemaker.
E. Connect drain, power and water.
6. Install transport tube:
A. Insert the ice transport tube through the bin into the transport elbow on the Icemaker. (Note: The ice-
maker is equipped with a safety switch located at the base of the elbow, this switch will prevent the
icemaker from running if the elbow is not properly installed).
B. Align the nylon lock screw on the elbow with the recess on the tube. Install lock screw.
7. Connect bin thermostat:
A. Locate bin thermostat cable supplied with the icemaker (Black cable) and connect to electrical box on
the UC700 and the receptacle on the side of the dispenser.
ATTACH TO BIN
ATTACH TO BIN
RIGHT SIDE INSTALL
LEFT SIDE INSTALL
FIGURE 2. SIDE BRACKET INSTALLATION
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INITIAL START UP, CHECKS AND ADJUSTMENT INSTRUCTIONS
NOTE: Do not start Icemaker before completing installation steps on pages 7 and 9.
Turn on water supply (if Icemaker is water cooled turn water on to condenser also) turn on main power switch
(located on top of electrical box), and make the following system checks:
NOTE: If Icemaker will not start be sure water reservoir is full. Low water safety control must be prop-
erly adjusted to start and shut down the Icemaker. If water level drops below bottom of reservoir, the
Icemaker must shut down. Adjustment is made by moving magnet up or down.
Water Level—If necessary adjust float by bending float arm up or down as needed, push float assembly down
until Icemaker stops running. Release float and Icemaker will restart. Keep water in reservoir at level line while
the Icemaker is in operation. See Figure 3
Low Water Safety Control—Adjust magnet by bending magnet arm as needed to shut unit down if water level
drops below bottom of reservoir.
Bin Control—Place ice around probe, unit should shut down in one minute. Remove ice from around probe,
unit should start in two minutes.
NOTE: For altitudes over 1000 feet above sea level, adjust range screw (behind end cover). Half turn
max. raises setting 4_F approx.
FIGURE 3. ICEMAKER FLOAT ASSEMBLY
Water modulating valve (water cooled units only)—Opening point of condenser water modulating valve
should be set to maintain proper operating pressure in the refrigeration system high side. (see chart on
page 13). Closing point of valve should be set low enough to close valve during compressor stand by periods.
To raise, turn counterclockwise, to lower turn clockwise.
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GUIDE TO SERVICE
WARNING: Disconnect electrical power to the Icemaker to prevent personal injury before
attempting any internal maintenance. Only qualified personnel should service internal
components or electrical wiring.
ICEMAKER CLEANING AND SANITIZING PROCEDURES
Do not use any of the ice made during cleaning operations.
Clean and sanitize ice storage area when cleaning icemaker.
1. Turn machine off.
2. Shut off water supply.
3. Remove ice from storage bin.
4. Mix approved cleaner (2 gallons as directed). Recommended cleaner: Calgon Corp. of Virginia Chemi-
cals, ice machine cleaner. Mixture: 3-1/3 ounces per gallon of water.
5. Clean auger assembly and ice transition tube in a sink using cleaner mixture and reinstall in icemaker.
6. Turn machine on and add cleaner solution to water level control until 2 gallons have been used.
7. Turn on water supply and run machine for 15 minutes.
8. Turn off machine and remove all ice.
9. Sanitize using household liquid bleach (50 ppm chlorine). Mixture: 1 fluid ounce per gallon room tempera-
ture water. 2 minute exposure time.
10. Sanitize auger assembly and ice transition tube in a sink using sanitizing solution and reinstall in icemaker.
11. Fill icemaker with sanitizer by slowly pouring solution into water feed reservoir until full. Solution will drain
through overflow tube. Do not run machine. Allow to air dry.
12. If icemaker is used in conjunction with ice dispenser or storage bin, follow manufacturer’s recommended
cleaning instructions at this time.
MAINTENANCE
Preventive maintenance can increase the trouble free life of your icemaker. Many authorized service agencies
offer service contracts for your icemaker. Contact your local distributor for further information.
Monthly
1. Clean the condenser. Use a brush, vacuum cleaner or blow from inside with air or CO2 gas.
2. Inspect water feed reservoir at lease once a month until a definite pattern for cleaning and sanitizing has
been established.
Quarterly
This is the maximum period of time between cleaning and sanitizing the icemaker. In addition to recommended
monthly procedure, and if a more frequent cleaning and sanitizing pattern has not been established, unit must
be cleaned and sanitized.
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Semi–Annually
Semi-Annually in addition to all previously established service procedures perform the following:
1. Check for water leaks in tube connections, water fittings and lower Icemaker water seal.
2. Check drain tubes for clogs and aged tubes. Replace if tubes are stained or brittle.
3. Check for signs of condensation. Clean where necessary and replace insulation properly.
4. Check safety circuits for proper operation.
5. Check refrigeration system (see page 13).
6. Check unit for abnormal noise. Tighten machine and cabinet screws, if necessary.
7. Check white upper bearings on auger assembly. If bearings are less than 1/16Ȃ thick, replace. See Figure 4
REPLACE
OK
1/16Ȃ
1/16Ȃ
OK
REPLACE
FIGURE 4. UPPER NUT AND BEARING ASSEMBLY
WATER LEVEL CONTROL
How Water Level Control Works
When water is introduced through the inlet fitting the float rises. the float pushes against a lever which in turn
forces the poppet assembly against the inlet fitting valve seat which seals the water off. See Figure 3 Before the
water inlet is sealed the safety switch is operated. In the event of a water failure the float would drop down and
operate the safety switch to shut off the machine.
If water level control will not shut off and seal at level as indicated, be sure inlet pressure does not exceed rec-
ommended factory operating range.
Under ordinary circumstances adjustment should not be necessary providing it was properly adjusted when unit
was installed or relocated. If, however, the control becomes inoperative, repair or replace. See Start-Up Adjust-
ment, page 9.
Purpose
1. To automatically maintain proper water level in the evaporator when unit is running and making ice.
2. A safety switch is operated in the event of an interruption in water supply. The switch shuts off the electrical
power to the icemaker and its refrigeration system. Switch will reset as soon as cause of water failure has
been corrected and proper water level in icemaker has again been reached.
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3. The transparent bowl not only provides a visible check of water level, but also is a good guide to the inter-
nal conditions which exist within the icemaker assembly itself. (See Cleaning Procedure.)
To Replace Water Level Control
1. Shut off the water supply. Shut off the main power switch or unplug the ice dispenser from electrical outlet.
2. Remove the flexible tubing from bottom of water level control and drain water from water level control and
evaporator.
3. Remove flexible tubing at bottom of water level bowl connected to the overflow.
4. Hold water inlet fitting with proper tool to prevent it from rotating when disconnecting the water inlet.
5. Remove wing nut holding water control to its mounting bracket. Control can be removed by lifting straight
up.
To Replace Water Level Safety Switch
1. Shut off main power switch or unplug the ice dispenser from electrical outlet.
2. Unplug molex connector connecting switch to electrical box.
3. Remove the 2 screws anchoring the water level safety switch to the bottom of the water level control
mounting bracket.
REFRIGERATION SYSTEM
NOTE: Thermostatic Expansion Valve No Adjustment
+ 10 Lbs Discharge Pressure
WATER TEMPERATURE
A
I
40°
174
202
230
265
300
328
65°
177
205
233
269
304
334
90°
180
208
236
272
307
340
50°
60°
70°
80°
90°
100°
R
T
E
M
P
REFRIGERATION SYSTEM ADJUSTMENTS
A complete understanding of the icemaker and hermetic refrigeration system is necessary before any adjust-
ments are made. The refrigeration technician must use high and low side pressure readings, water and air tem-
peratures, plus general conditions of cleanliness to assess the refrigeration system status when making any
adjustments.
All icemaker products are tested and adjusted at the factory prior to shipment where the ambient temperature
ranges from 65_ to 90_F, depending on the season of the year.
Whenever a new icemaker product is initially installed and started-up, it is imperative that the start-up operation
make the following checks and/or readjustments for local conditions.
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EXPANSION VALVE
You will find a thermostatic expansion valve on icemakers, which is used to control the amount of refrigerant
flowing through the evaporator. Improperly installed or defective expansion valves may cause low production,
soft ice, squeaking from evaporator and excessive load inside evaporator.
By using general refrigeration system troubleshooting along with the pressure charts you can easily determine
whether or not the expansion valve is working properly.
ADJUSTMENT AND TROUBLESHOOTING
When troubleshooting the expansion valve you must first be sure you have adequate water flowing into evapo-
rator, a clean condenser, unit is properly ventilated, and system is properly charged and free from any restric-
tions. Also be sure compressor is operating properly.
Second, take reservoir water temperature and air temperature from condenser inlet and determine at what pres-
sure unit should be running. Machines are equipped with thermostatic valves, there is NO adjustment. If correct
pressure cannot be obtained, first be sure system has time to stabilize 10-15 minutes. Second, be sure sensing
bulb is located at 12:00 position on outlet side of evaporator about 3-4 inches away from evaporator and be sure
to insulate well and clamp tightly to tubing. If system pressures are still not adequate, take a second water and
air temperature reading and go over other parts of system for possible problems. If proper charge is question-
able evacuate and recharge to nameplate and leak check. If valve still malfunctions replace valve.
When replacing valve be sure to bleed refrigerant gas from low side port so as not to lose refrigerant oil. Use
general refrigerant system practices when replacing and recharging unit. After new valve is in place, go through
previous monitored adjustments and troubleshooting to be sure valve is functioning properly.
NOTE: Units with thermostatic expansion valve—The valve is located on bottom refrigerant line. Sens-
ing bulb is located on top refrigerant line. On water cooled units adjust condenser modulating valve
before troubleshooting expansion valve.
CAUTION: Very high discharge pressure is present in system. Quick disconnects on your
gauges will minimize danger and loss of refrigerant. Comply with federal regulations for
reclaiming refrigerant.
CONDENSER MODULATING VALVE
The reason for using a water modulating valve is to supply the correct amount of water to the condenser. and to
maintain a proper operating pressure to refrigeration system high side.
The flow of water through the valve is increased as the high side pressure rises and is decreased as high side
pressure lowers.
To calibrate the amount of water flow with the refrigeration system high side pressure, turn adjustment screw
located on end of valve opposite of bellows. See Figure 6. Turn screw counterclockwise to raise opening point
or clockwise to lower opening point. Opening point of valve should be set to maintain proper operating pressure
in refrigeration system high side. Refer to Pressure Chart on page 3. Closing point of valve should be set low
enough to close valve during compressor stand-by periods.
NOTE: Cold water will absorb heat faster than warm water. The water flow will therefore automatically
increase as inlet temperature increases.
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SIGHT
GLASS
THERMOSTATIC
EXPANSION VALVE
FIGURE 5. EXPANSION VALVE
FSCREW
CONDENSER MODULATING VALVE REMOVAL
1. Disconnect power to unit, then shut off water supply to condenser and evacuate refrigerant from system.
2. Remove inlet water line from Condenser Modulating Valve. Also remove tube from high side refrigerant
line.
3. Remove Condenser Modulating Valve and bracket from unit.
4. Remove valve from bracket.
5. Replace Condenser Modulating Valve by reversing Steps 2 thru 4. Then pull system into vacuum.
6. Charge unit with proper amount of refrigeration.
7. Turn power and water on to unit.
8. With unit running, adjust modulating valve to proper setting.
9. Go through a complete system check.
BIN CONTROL
The type of bin control used on all UC Models is thermostatically controlled. The switch itself is inside the elec-
trical box of the Dispenser and can be serviced from the front of the unit. The cap tube bulb is located in the
thermostat well directly under the ice inlet.
To test switch, disconnect power to unit and remove one wire from switch. Connect both leads of your ohmme-
ter to the Bin Control Switch terminals. With control bulb at room temperature ohmmeter should read “Closed
Circuit”.
Now cover the control bulb with ice, within 1 minute switch should “click” and ohmmeter should read “Open Cir-
cuit.” The Bin control is in electrical series with a 24 volt transformer located in the ice dispenser and a 24 volt
control relay located in the Icemaker.
The Bin 24 volt control relay is in electrical series with coil on antifreeze relay along with the low water safety. If
unit is water cooled, the condenser high pressure cut out is also in series.
The Control Switch is held in place inside electrical box by 2 screws. Control bulb is positioned under ice chute
and can be replaced by removing the capillary from the thermostat well.
The most important thing to remember when replacing probe is to be careful not to cut or kink probe and be
sure sensor bulb is located in a position to shut unit down before ice reaches ice chute.
This icemaker is equipped with a safety ice level sensor. This sensor control is located on top of theevaporator.
This switch is also in electrical series with the anti-freeze relay and other safety circuitry.
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GEARMOTOR
The gearmotor is equipped with a start relay and a manual reset overload.
When current is applied, the relay energizes and completes the circuit to the start winding. The motor reaches a
predetermined speed and the relay drops out, disconnecting the start winding. The run winding remains in the
circuit as long as current is applied.
The purpose of the overload is to automatically shut off the motor in the event of a mechanical bind of the trans-
mission, an overload condition within the evaporator or an electrical malfunction. It does this by sensing amper-
age draw. If the motor stalls the start relay would energize and stay energized. The amperage would surge 5 to
6 times greater than the normal draw. In this event the overload would shut off the transmission in 4 to 8 sec-
onds.
If the motor is subjected to an abnormal load, but does not reach a stall condition, the overload will react, but
over a greater period of time. The reaction time depends upon the amperage to which it is subjected.
The overload, through the safety circuit, also shuts off the compressor.
GEARMOTOR
OVERLOAD TRIPPED
Check water level control
and evaporator water tube
for line build-up restrictions.
NO
YES
CAUTION
evaporator and
auger before
resetting overload.
Clear ice from
CLEAN
See Instructions.
Reset overload.
IMPORTANT
Icemaker
runs.
Will not
Reset.
Resets but
motor does
not run.
Icemaker runs when
reset but problem has
not been found.
Continue checking for
overload as follows to
guard against future
problems.
Short run. Trips
again in 2
minutes. Check
gearmotor circuits.
Overload
hot try
again.
Resets but
motor does
not run.
Will not
reset.
Replace
overload.
Check
gearmotor
circuits.
OVERLOAD GUIDE
ELECTRICAL:
S
S
S
High or low voltage. Weak power lines can cause overloads on icemakers restarts.
High running current (2.4amps or above). Check motor circuits and start relay.
Auger delay failed.
ICEMAKER
S
S
S
Mechanical parts worn. Scored evaporator or auger. Worn thrust bearing.
Icemaker not turning off. Failed ice level control.
Over compression. Low water inlet temperature. Restrictions in water line from reservoir.
REFRIGERANT
S
S
S
Contaminated charge or bad compressor.
Low charge or gas leak.
Low suction pressure. Improper expansion valve. Sensing bulb location or insulation
and/or defective expansion valve.
MOTOR CHECK
The resistance readings on the winding will be between 5 to 25 ohms. A meter capable of these low readings
must be used. The start relay cover must be removed. (See Figure 7).
If no continuity on start or run winding test, replace gearmotor. If continuity on grounded motor test, replace
gearmotor.
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START RELAY
1. Check between “2” and “4” on relay (with relay unplugged). If there is continuity replace the relay, as the
relay contacts should be open.
2. Check between “3” and “4” on relay, if no continuity replace the relay.
FIGURE 7. GEARMOTOR ASSEMBLY
TO REPLACE GEARMOTOR ASSEMBLY
1. Disconnect the icemaker from the electrical power source.
2. Disconnect the transmission cable from the electrical box.
3. Remove the 4 hex head bolts securing the evaporator to the top of the transmission.
4. Remove the 4 bolt’s holding the transmission and bracket to frame base, while supporting the weight of the
evaporator. Remove the transmission from the unit.
5. When replacing the transmission, it may be necessary to rotate the auger back and forth to align the motor
shaft and auger.
AUGER NUT
AUGER
BEARING NYLON
BEARING DELRIN
“D” DRIVE
GROOVE
EXTRUDING
HEAD
ANTI–ROTATION
RIB – 3 PLACES
FIGURE 8. AUGER AND EXTRUDING HEAD REMOVAL
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AUGER AND EXTRUDING HEAD REMOVAL
1. Disconnect unit from power supply.
2. Remove storage container cover and put aside.
3. Turn off water supply to icemaker.
4. After ice has melted from head take hold of the auger nut and lift straight up to disengage from icemaker.
5. When replacing the auger assembly, make certain that both the auger engages the output shaft drive and
the extruding head ribs engage the evaporator tube. (See Figures 8 )
E–RING
WASHER, PLAIN FLAT
SHAFT SEAL
MOUNT, SHAFT
SEAL
SEAT, SHAFT SEAL
GEARMOTOR
FIGURE 9. SHAFT SEAL
INSTALLATION AND SHAFT SEAL REPLACEMENT (See Figure 9)
1. Place shaft seal locator seat and shaft seal mount over gearmotor output shaft and push down until shaft
seal seat and shaft seal mount rest flush on top of gearmotor.
2. Place rubber coated ceramic seal (important: ceramic face up) over output shaft and push down until seal
nest in recess of shaft seal mount. (lubricate rubber on ceramic seal with rubber lubricant).
3. Place shaft seal with carbon face down (spring up) over output shaft and push (gently) downward until seal
rests on carbon face of the output shaft seal.
4. Place flat washer over output shaft and let rest on the output shaft seal. Push down on the washer com-
pressing the spring on the output shaft seal. While holding the seals (down) in place slide the E-ring into
the groove on the output shaft.
UPPER NUT AND BEARING ASSEMBLY
The upper white bearing located on top of the auger is used to absorb the force between the auger and extrud-
ing head.
NOTE: The bearings are 3/32Ȃ thick. When they wear below 1/16Ȃ they should be replaced. Bearings to
be inspected for wear during quarterly maintenance. (See Figure 4)
To Replace Bearing
1. Disconnect unit from electric power.
2. Remove top panels.
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3. Remove Dispense Tray Cover.
4. Use an open end wrench on auger nut connected to bearing and turn counterclockwise to remove
assembly.
5. Remove worn bearings. Replace with new bearings and then reinstall assembly.
NOTE: If auger turns with nut, remove cover on top of gearmotor stator and hold motor while loosen-
ing nut.
FIGURE 10. OVERLOAD CHECK
FIGURE 11. COMPRESSOR CHECK
ELECTRICAL CHECKOUT
1. Be sure the unit is disconnected from the power source. Remove the compressor electrical box cover.
Check for obvious damage and loose wires.
2. Disconnect the fan motor leads. Since capacitors store energy, short the capacitor with a screwdriver. This
will prevent shocks.
3. Disconnect the compressor terminal wires.
OVERLOAD CHECK (See Figure 10)
1. Using a volt-ohmmeter check the continuity across the overload, contact #1 and #3. If none, wait for unit to
cool down and try again. If still no continuity, the overload protector is defective and should be replaced.
COMPRESSOR CHECK (See Figure 11)
The resistance readings on the windings will be between 0.25 to 10.00 ohms, a meter capable of these low
readings must be used.
1. Check between “C” and “R.” Replace the compressor if there is no continuity as the run windings are open.
2. Check between “C” and “S.” Replace the compressor if there is no continuity as the start windings are
open.
3. Check between “C” and “R” or “S” and the shell of the compressor. If there is continuity, replace the com-
pressor as the motor is grounded.
4. Check between screw terminal on the overload and “C” on the compressor. Check and repair the lead or
connections if there is no continuity.
CAPACITOR CHECK
1. Check or replace start capacitor, disconnect bleed resistor before checking for shorted capacitor.
2. Check or replace run capacitor (if supplied) check for shorted capacitor or either terminal grounded to case.
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FIGURE 12. GEAR MOTOR OVERLOAD
SAFETY CONTROLS
Your icemaker unit has several safety and control devices incorporated into its design.
WARNING: None of the below described devices should ever be “bypassed” to allow the
unit to function.
The safety and control system shut-off devices are:
1. Low water shut off reed switch located in icemaker float assembly. (Automatic reset type.)
See Figure 3
2. Gearmotor thermal overload, manual reset type (red button on motor). See Wiring Diagram Figure 13.
3. Compressor thermal overload, automatic reset type. See Figure 10
4. Anti-freeze relay and associated circuit. See Wiring Diagram Figure 13.
5. Main service switch located on top of the control box. See Wiring diagram Figure 13.
6. Bin Control.
7. High pressure cut out (water cooled only).
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GUIDE TO GOOD ICE
CUSTOMER
COMMENTS
CHECK ICEMAKER
LOCATION CONDITIONS
FIRST
CHECK ICE MAKER
“It runs but the ice is
too soft.”
S Proper air flow for condens-
S Use gauges for checking
suction and head
ing system.
pressures. See manual
for correct reading and
conditions. Check frost
line and sight glass.
“The icemaker is not
S Location too close to high
units such as coffee urns,
deep fryers, grills, etc.
producing enough ice.”
“The ice is too wet.”
S Supply water conditions
S Check water level for
proper adjustment and
restrictions. See
Manual.
Water too warm
(above 90_F).
Water artificially softened
above 262 ppm sodium chlo-
ride.
S Check evaporator
assembly for worn
parts, bearings, scored
evaporator and auger,
bad expansion valve.
etc.
Normal water supply too high
in total dissolved solids
(above 500 PPM).
“It makes too much
noise.”
(With this comment
the ice is usually
extremely hard and
larger than normal.)
S Check to see if noise
objection is normal fan and
air flow noise.
S Check for loose parts
and screws rattling.
S Check evaporator
assembly for worn
parts, bearings, scored
evaporator and auger,
bad expansion valve,
etc.
Over
Compression
S Supply water conditions.
Water too cold (below
50_F). (Possibly running
from pre-cooler.)
S Obstructions partially
blocking ice exit from top of
evaporator.
S Check fan and fan shroud.
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FIGURE 13. WIRING DIAGRAM
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TROUBLESHOOTING CHART – ICEMAKER NOT OPERATING
LOW WATER SAFETY
ICEMAKER RUNS BUT
GEARMOTOR OVERLOAD
TRIPPED
NO POWER
ICEMAKER OPERATING BUT
SOFT ICE
SWITCH OPEN
DOES NOT MAKE ICE
Remote condenser
units only
Condenser fan running
Check water level control
and evaporator water tube
for lime build up restriction.
Check electrical wiring in con-
trol box for loose connec-
tions.
Check for failed service
switch or relay.
Check power to machine.
but compressor not running
Check bin switch
Check line voltage.
Check compressor winding
& components.
Check that water is turned on.
Check for restriction in water line.
Check incoming water pressure
(minimum 10 lbs.).
Remote condenser
not running.
Yes
No
No
Yes
Check water safety switch.
Evaporator water tube
may have an air bubble.
Clear air bubble from
tube.
High pressure
Check electrical
Check power
to condenser.
Clean all related
drain lines.
Refer to guide
to Good Ice in
service manual.
CAUTION
Clear ice from
evaporator and
auger before re-
setting over-
load.
CLEAN
see
instructions.
switch open or
wiring in control box
cycling on and off.
for loose connections.
High suction pressure
Low suction pressure
(20 lbs. or below).
(30 lbs. or above).
Reset
overload.
Head
Pressure
high.
TXV not
operating
properly.
Suction line
not
insulated.
TXV bulb
lost charge.
Discharge
king valve
partially
Non-condensible
in system.
Too much
refrigerant in
system.
Condenser
fan not
running.
Condenser
dirty or
Valve
Bulb
loose.
Bulb
uninsulated.
Replace valve
evacuate and
recharge.
restricted.
stuck
Icemaker runs
closed.
Reset but
motor does
not run.
Will not
reset.
open.
Replace
valve.
Clean
and
Clean and
insulate.
tighten.
Evacuate and
recharge system.
Clean condenser.
Check electrical circuit
to fan motor.
Check fan motor.
IMPORTANT
Short run trips
again in 2 min-
utes. Check gear-
motor circuit.
Check
gearmotor
circuit.
Overload
hot try
again.
Open
valve
Icemaker runs when reset
but problem has not been
found.
Continue checking for
overload as follows to
guard against future
problems
Low pressure switch open
or cycling on and off.
Will not
reset
replace
overload
Remote condenser
units only
Low on
refrigerant.
Plugged
liquid line
dryer.
Restricted
liquid line.
Plugged or
faulty TXV.
Icemaker
froze up.
Check if
auger is
turning.
Check for
leaks.
LAC not operating
properly (minimum
discharge pressure
180 lbs.).
Replace
dryer.
Evacuate
and
recharge
system.
Check for
kinks or
damage to
liquid line.
Replace
valve.
Evacuate
and
recharge
system.
OVERLOAD GUIDE
ELECTRICAL
High or low voltage weak power lines can cause overloads on icemaker restarts
High running current. Check motor circuits and start relay – Auger delay failed.
ICEMAKER
Mechanical parts worn. Scored evaporator or auger. Worn thrust bearing.
Ice maker not turning off. Failed ice level control.
Over compression. Low water inlet temperature. Restriction in water line from
reservoir.
No
REFRIGERANT
Replace LAC valve,
evacuate and
recharge system.
Contaminated charge or bad compressor.
Low charge or gas leak.
Low suction pressure. Improper expansion valve sensing bulb. Location or insulation
and/or defective expansion valve
Check if extruding
head is down in
evaporator tube.
Check drive on
gearmotor.
Check gears in
gearbox.
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TROUBLESHOOTING
IMPORTANT: Only qualified personnel should service internal components or electrical wiring.
TROUBLESHOOTING COMPRESSORS
Trouble
Probable Cause
Remedy
Basically the compressor problems can be narrowed down to three areas of checkout.
THE COMPRESSOR WILL
NOT RUN
A. No voltage to the compressor
terminals.
A. Check circuit.
B. Low voltage.
B. Below 90% of nameplate rated
voltage.
C. Problems in the compressor
electrical circuit.
C. See electrical checkout
instructions.
THE COMPRESSOR STARTS
BUT TRIPS REPEATEDLY ON
THE OVERLOAD
A.
A. Check for proper fan operation
and clean condenser.
B.
B. Check the compressor suction
and discharge pressures.
PROTECTOR
C. Voltage.
C. Voltage should be within 10% of
the rated nameplate voltage.
D. High compressor amperage
draw.
D. It should never exceed 120% of
the rated nameplate amperage.
See electrical checkout
instructions.
THE COMPRESSOR RUNS
BUT WILL NOT
REFRIGERATE
A. Compressor not working.
A. Check the compressor suctions
and discharge pressures. See
chart on page 13.
24
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IMI CORNELIUS
CERTIFICATE OF WARRANTY
TWO YEAR LIMITED ICE EQUIPMENT WARRANTY
IMI Cornelius warranty to the original commercial purchaser/user, that any commercial product of its manufacture bearing the name Cornelius will
be free from defect in material and/or factory workmanship, and that if properly installed, maintained, and serviced in accordance with the Service
Manual furnished with the product, it will perform adequately under normal use. This product warranty shall be effective for a period of two years
from the date of original installation of 27 months from the date of original shipment by IMI Cornelius, whichever period elapses first, provided the
warranty registration card is completed and returned to IMI Cornelius within 30 days from the date of installation.
IMI Cornelius obligation under this warranty is limited to the repair or replacement, including reasonable labor charges, of any part of parts which
the purchaser/user returns to IMI Cornelius factory, transportation costs prepaid, and which IMI Cornelius finds to be defective in workmanship and/
or material within the warranty period. To be reimbursable under this warranty, labor charges must be submitted to IMI Cornelius within 30 days from
the date of service, must be performed by a qualified company acceptable to IMI Cornelius, and must be for reasonable and customary straight time
labor charges only. No travel time, mileage, or other charges in excess of straight time charges will be accepted. Any replacement parts must be
approved IMI Cornelius parts. The serial and model numbers and date of original installation of the product must be given.
ADDITIONAL THREE YEAR LIMITED WARRANTY ON COMPRESSOR
The hermetically sealed refrigeration compressor is covered by the above two year limited warranty. In addition to that warranty, if the compressor
fails because of a defect in materials or workmanship during the third through fifth year from the date of installation, IMI Cornelius will repair or at
its option, replace the compressor. Labor charges and the cost of relays, overloads and capacitors are not included.
This warranty does not include failure or other damage resulting from:
S
S
S
S
S
S
S
S
Electrical power failure to the ice machine for any reason
Water supply failure to the ice machine for any reason
Adverse operating conditions as set forth in your Service Manual
Drain line malfunctions as set forth in your Service Manual
Failure to clean and maintain the ice machine as set forth in your Service Manual
Use of non-authorized replacements parts
Unauthorized modification of the ice machine
Any product installed outside the U.S.A. or Canada
No part or assembly which has be subject to accident, alteration or misuse or which is not installed, maintained, or serviced in accordance with the
Service Manual furnished with the product, or which is from a machine on which the serial number has been altered or removed, shall be covered
by this warranty.
THIS WARRANTY DOES NOT COVER DAMAGE CAUSED BY LACK OF PREVENTATIVE MAINTENANCE, IMPROPER INSTALLATION,
ACCIDENT, MISUSE, NEGLIGENCE, ALTERATION, FIRE, FLOOD, OR ACTS OF GOD. In those jurisdictions where liability for damages cannot
be disclaimed, original purchasers recovery shall not exceed the cost of the warranted product.
IMI CORNELIUS ASSUMES NO LIABILITY FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES OF ANY KIND, INCLUDING, BUT NOT LIM-
ITED TO, SPOILED PRODUCT, LOST PROFITS, OR DAMAGE TO OTHER PROPERTY.
THIS WARRANTY IS EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES, WHETHER WRITTEN, ORAL, OR IMPLIED, INCLUDING ANY
WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, AND SUPERSEDES AND EXCLUDES ANY ORAL
WARRANTIES OR REPRESENTATIONS OR WRITTEN LANGUAGE IN ANY MANUAL, LITERATURE, ADVERTISING BROCHURE OR
OTHER MATERIALS NOT EXPRESSLY DESIGNATED IN WRITING AS A “WARRANTY
IMI CORNELIUS
25
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IMI CORNELIUS INC.
Corporate Headquarters:
One Cornelius Place
Anoka, Minnesota 55303-6234
Telephone (800) 238-3600
Facsimile (763) 422-3246
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