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Technical Service and
Parts Manual
Model 506
Undercounter
Icemaker
© SUB-ZERO FREEZER COMPANY INC.
2006 ALL RIGHTS RESERVED
JOB AID #3752200
(Revision B. - May, 2006)
Model 506 (UC Ice Maker)
General Information
SECTION 1
GENERAL INFORMATION
1-1
#3752200- Revision B - May, 2006
General Information
Model 506 (UC Ice Maker)
INTRODUCTION
This Sub-Zero Technical Service and Parts Manual (Job Aid Part #3752200) for the Model 506 Undercounter
Icemaker is a compilation of information provided by the Whirlpool Company and has been reprinted by Sub-Zero
Freezer Company, Inc., with the permission of the Whirlpool Company. This manual will provide the most recent
service information about the Model 506 Undercounter Icemaker. This information will enable the service technician
to diagnose malfunctions, perform necessary repairs and return a Model 506 appliance to proper operational status.
The service technician should read the complete instructions contained in this manual before initiating any repairs on
a Model 506.
IMPORTANT SAFETY INFORMATION
TECHNICAL ASSISTANCE
Below are Product Safety Labels used in this manual.
The "Signal Words" used are WARNING or CAUTION.
If you should have any questions regarding the 506
Series and/or this manual, please contact:
When reviewing this manual, please note these different Product Safety Labels placed at the beginning of
certain sections of this manual. You must follow the
instructions given in the boxes of the Product Safety
Labels in order to avoid personal injury and/or product
damage.
Sub-Zero Freezer Company, Inc.
ATTN: Service Department
P.O. Box 44988
Madison, WI 53744 - 4988
Customer Service & Parts / Warranty Claims
Phone #: (800) 222 - 7820
The sample Product Safety Labels below illustrate the
precautions that should be taken when the signal word
is observed.
Technical Assistance
Phone #: (800) 919 - 8324
INDICATES THAT HAZARDOUS OR UNSAFE
PRACTICES COULD RESULT IN SEVERE PERSONAL INJURY OR DEATH.
Customer Service & Technical Assistance
Facsimile #: (608) 441 - 5887
Indicates that hazardous or unsafe practices could
result in minor personal injury, and/or product
damage, and/or property damage.
Service Department E-Mail Address:
[email protected]
Parts / Warranty Claims
Facsimile #: (608) 441 - 5886
Office Hours:
7:00 AM to 7:00 PM Central Time
Monday through Friday
In addition, please pay attention to the signal word
“NOTE”, which highlights information that is especially
important for the topic being covered.
This manual is designed to be used by Authorized Service Personnel only. Sub-Zero Freezer Co., Inc.
assumes no responsibility for any repairs made on Sub-Zero refrigeration units by anyone other than
Authorized Service Technicians.
Information and images contained in this manual are the copyright property of Sub-Zero Freezer Company, Inc.
Neither this manual nor any information or images contained herein may be copied or used in whole or in part
without the express written consent of Sub-Zero Freezer Company, Inc.
© Sub-Zero Freezer Company, Inc, all rights reserved.
#3752200 - Revision B - May, 2006
1-2
Model 506 (UC Ice Maker)
General Information
TABLE OF CONTENTS
Page #
Page #
Section 1 - General Information .............................. 1-1
Section 4 - Component Access and Removal ........ 4-1
Introduction ......................................................................
Important Safety Information ............................................
Technical Assistance ........................................................
Table of Contents ............................................................
Warranty Information ........................................................
Component Access and Removal .................................... 4-2
Warnings .......................................................................... 4-2
Cautions .......................................................................... 4-2
Control Panel.................................................................... 4-3
Control Panel Component Testing .................................. 4-3
Service Control Switch .................................................... 4-3
Evaporator Thermostat .................................................... 4-4
Bin Thermostat ................................................................ 4-5
Thermostat........................................................................ 4-5
Door Light Switch ............................................................ 4-5
Bin Area Components ...................................................... 4-6
Bin Door............................................................................ 4-6
Friction /Door Catch ........................................................ 4-6
Cutter Grid ........................................................................ 4-6
Bin Light............................................................................ 4-7
Water Reservoir Pan ........................................................ 4-7
Water Pump...................................................................... 4-8
Evaporator ........................................................................ 4-9
Distributor ........................................................................ 4-10
Components in Unit Compartment .................................. 4-11
Accessing Unit Compartment .......................................... 4-11
Condenser Fan ................................................................ 4-12
Water Inlet Valve .............................................................. 4-12
Compressor and Starting Components ............................ 4-13
Starting Relay .................................................................. 4-13
Compressor Overload Protector ...................................... 4-13
Compressor ...................................................................... 4-13
Condenser ........................................................................ 4-14
Hot Gas Valve .................................................................. 4-14
1-2
1-2
1-2
1-3
1-5
Section 2 - Installation Information.......................... 2-1
Pre-Installation Considerations ........................................ 2-2
Location ............................................................................ 2-2
Electrical Connection........................................................ 2-2
Water Connection Requirements .................................... 2-3
Installation of Line Tapping Device / Shut-off Valve ........ 2-3
Drain Connection Requirements ...................................... 2-4
How it Works .................................................................... 2-4
Installing the Unit .............................................................. 2-6
Changing Front Panels .................................................... 2-7
Thermostat Calibrations .................................................. 2-8
Water Deflector Installation .............................................. 2-8
Starting Up the Unit .......................................................... 2-8
Normal Consumer Maintenance ...................................... 2-9
Preparing Cleaning Solution From Acid Crystals ............ 2-9
Using a Commercially Prepared Cleaning Solution ........ 2-10
Condenser Cleaning ........................................................ 2-11
Section 3 - Theory of Operation .............................. 3-1
Operating Systems .......................................................... 3-2
Refrigeration System ........................................................ 3-2
Refrigeration Flow - Ice Making Cycle ............................ 3-3
Refrigeration Flow - Harvest Cycle .................................. 3-4
Water System .................................................................. 3-5
Ice Making Cycle .............................................................. 3-5
Harvest Cycle .................................................................. 3-6
Clean Cycle ...................................................................... 3-6
Electrical System .............................................................. 3-7
Operational Cycles ...................................................... 3-8
Ice Making cycle .......................................................... 3-8
Harvest Cycle .............................................................. 3-9
OFF Cycle When Bin is Full of Ice and the Service
Control Switch is in “ON” Position................................ 3-10
OFF Cycle When Service Control Switch is in “OFF”
Position but Power is Still Supplied to Unit .................. 3-11
Clean Cycle.................................................................. 3-11
What’s in Water ................................................................ 3-13
Section 5 - Parts Lists & Exploded Views .............. 5-1
Cabinet, Liner & Door Parts List
(Prior to Serial #1181341) ................................................
Evaporator, Cutter Grid & Water System Parts List
(Prior to Serial #1181341) ................................................
Escutcheon & Control Components
(Prior to Serial #1181341) ................................................
Water Pump Components (Prior to Serial #1181341)......
Unit Area Components (Prior to Serial #1181341) ..........
Cabinet, Liner & Door Parts List
(Starting with Serial #1181341) ........................................
Evaporator, Cutter Grid & Water System Parts List
(Starting with Serial #1181341) ........................................
Escutcheon & Control Components
(Starting with Serial #1181341) ........................................
Water Pump Components
(Starting with Serial #1181341) ........................................
Unit Area Components (Starting with Serial #1181341) ..
1-3
5-2
5-4
5-6
5-7
5-8
5-2
5-4
5-6
5-7
5-8
#3752200- Revision B - May, 2006
General Information
Model 506 (UC Ice Maker)
Page #
Section 6 - Troubleshooting Guide .......................... 6-1
Troubleshooting Guide ....................................................
How to Use the Troubleshooting Guide ..........................
Troubleshooting Guide Layout..........................................
Troubleshooting Guide ....................................................
System / Compressor Evaluation ....................................
6-2
6-2
6-2
6-3
6-5
Section 7 - Technical Data Tables ............................ 7-1
Technical Specifications (Prior to Serial #1181341) ........
Ice Production (Prior to Serial #1181341) ........................
Performance Data (Prior to Serial #1181341) ..................
Technical Specifications (Starting with Serial #1181341)
Ice Production (Starting with Serial #1181341) ................
Performance Data (Starting with Serial #1181341) ..........
Product Specifications ......................................................
7-2
7-2
7-2
7-3
7-3
7-3
7-4
Section 8 - Wiring Diagrams & Schematics ............ 8-1
Model 506 (Prior to Serial #1181341) .............................. 8-2
Model 506 (Starting with Serial #1181341) ...................... 8-3
Linear Strip Circuits .......................................................... 8-4
#3752200 - Revision B - May, 2006
1-4
Model 506 (UC Ice Maker)
General Information
WARRANTY INFORMATION
ONE & FIVE YEAR Display / Model Home Warranty
Summary (Display units sold three years after date
of manufacture)
This page contains a summary of the 2, 5 & 12 Year
Warranty that is supplied with every Sub-Zero
Appliance.
• One Year TOTAL PRODUCT warranty, *parts and
labor.
• Five year LIMITED SEALED SYSTEM warranty,
sealed system **parts only.
TWO, FIVE & TWELVE YEAR Warranty Summary
(Starting with Serial #900000)
• Two year TOTAL PRODUCT warranty, *parts and
labor.
• Five Year SEALED SYSTEM warranty, **parts and
labor.
• Sixth through Twelfth year LIMITED SEALED SYSTEM warranty, sealed system **parts only.
Warranty Details:
• * Total Product Parts includes, but is not limited to the
following:
Control, Circulating Pump, Switches, Fan Motor &
Blade, Drain Tube, Wiring, Water Valve, Hot Gas
Valve, Door hinges, Compressor Electricals, etc. . .
ONE, TWO, FIVE & TWELVE YEAR Warranty
Summary (Between Serial #600000 and #900000)
• ** Sealed System Parts include the following:
• Two year TOTAL PRODUCT warranty, *parts and
labor.
• Five Year SEALED SYSTEM warranty, **parts and
labor.
• Sixth through Twelfth year LIMITED SEALED SYSTEM warranty, sealed system **parts only.
Compressor, Condenser, Evaporator, Filter-Drier, Heatexchanger, All Tubing That Carries the Freon.
NOTE: Condenser Fan Motor, Freon, Solder and compressor electricals are NOT considered sealed system
parts.
Warranty Notes:
ONE & FIVE YEAR Non-Residential Warranty
Summary (Example: Office, Yacht, etc.)
• Sub-Zero Freezer Company, Inc. assumes no liability
or responsibility for Sub-Zero products that have been
altered in any way, including the use of parts and/or
components not specifically approved by Sub-Zero.
• One Year TOTAL PRODUCT warranty, *parts and
labor.
• Five year LIMITED SEALED SYSTEM warranty,
sealed system **parts only.
• All warranties begin at the time of the unit's initial
installation.
• All Warranty and Service information collected by SubZero is arranged and stored under the unit serial number and/or customer name. Sub-Zero requests that
you have the model and serial number available whenever contacting the factory or parts distributor.
• The serial number tag is located in two places, one on
the left wall of the ice bin and one on the unit tray.
1-5
#3752200- Revision B - May, 2006
General Information
#3752200 - Revision B - May, 2006
Model 506 (UC Ice Maker)
1-6
Model 506 (UC Ice Maker)
Installation & Maintenance
SECTION 2
INSTALLATION
&
MAINTENANCE
2-1
#3752200 - Revision B - May, 2006
Installation & Maintenance
Model 506 (UC Ice Maker)
Pre-Installation Considerations
ELECTRIC SHOCK HAZARD
Location
IMPROPER CONNECTION OF THE EQUIPMENT
GROUNDING CONDUCTOR CAN RESULT IN A
RISK OF ELECTRICAL SHOCK.
The unit may be closed in on the top, rear and both
sides, but the front must be unobstructed for air circulation and proper operation. Installation should be as
such that the cabinet can be moved forward for servicing, if necessary.
DO NOT USE A TWO PRONG ADAPTER.
DO NOT USE AN EXTENSION CORD.
The installation site should be well ventilated with the
temperature above 55°F (13°C) and below 110°F
(43°C). The best results are obtained between 70°F
(21°C) and 90°F (32°C).
DO NOT HAVE A FUSE IN THE NEUTRAL OR
GROUNDING CIRCUIT.
DO NOT CONNECT TO ELECTRICAL SUPPLY
UNTIL APPLIANCE IS PERMANENTLY GROUNDED.
The unit must be installed in an area protected from the
elements, such as wind, rain, water spray or drip.
FAILURE TO FOLLOW THESE INSTRUCTIONS
CAN RESULT IN FIRE, ELECTRICAL SHOCK OR
DEATH.
Provision for electricity, water and drain should be
determined.
Electrical Connection
3-Prong
Grounding Type
Wall Receptacle
The unit will require an electrical branch circuit of:
115 Volts
60 Hertz
1 Phase
15 Amp delayed action fuse or circuit breaker.
It is recommended that the ice maker is the only appliance plugged into the receptacle. Do not use an extension cord. Do not use a receptacle that is controlled by
a wall switch. (See Figure 2-1)
3-Prong
Grounding Plug
Power Supply
Cord
ELECTRICAL GROUND IS REQUIRED ON THIS
APPLIANCE. DO NOT, UNDER ANY CIRCUMSTANCE, REMOVE THE POWER SUPPLY GROUND
PLUG.
#3752200 - Revision B - May, 2006
Figure 2-1. Power Cord & Wall Outlet
2-2
Model 506 (UC Ice Maker)
Installation of Line Tapping Device and/or Shut-off
Valve
Water Connection Requirements
Materials needed for installation:
1/4-in. O.D. copper tubing
1/4-in. outlet, saddle-type shut-off valve
(Part No. 4378392)
1/4-in. x 1/4-in. tube union
(Part No. 4378972)
1. Select the point on an active cold water supply line
convenient to the unit where connection is to be
made. A point on a vertical section of 1/2-in. or 3/4in. line leading to the kitchen sink is ideal. If
installed on a horizontal line, place valve on top or
side of line; never on bottom. (This will keep water
away from the drill during installation and helps normal sediment from collecting in the valve.) Turn off
the water supply and clear line of pressure.
These materials can be obtained locally or from your
FSP Parts Distributor by ordering Ice Maker Installation
Kit No. 978567, which includes 25 feet of copper tubing.
Do not use plastic tubing because it becomes brittle
with aging.
2. Provide a length of 1/4-in. O.D. copper tubing for
connecting the ice maker to the water supply. To
determine the length, measure distance from the
unit to the connecting point on supply line, and add
approximately three feet to allow for connection to
the water valve in the unit. Be sure both ends of
copper tubing are cut square.
Make sure the saddle valve complies with local plumbing codes. Do not use a self-piercing type or 3/16-inch
saddle valve because they reduce water flow and clog
more easily.
For proper operation, the ice maker should be connected to an active water supply line delivering cold water
at pressures between 20 and 120 pounds per square
inch. (See Figure 2-2)
3. Drill a 1/8-in. hole in water supply line at point
selected for making connection. Care must be
taken to drill a clean hole perpendicular to wall of
supply line. Be sure electric drill is grounded, or
use a hand drill to avoid shock.
Do not install copper tubing in an area where
temperatures drop below freezing. To do so
may result in water damage.
Vertical
Cold Water
Pipe
4. Be sure the shut-off valve is in the OFF position.
Turn clockwise until the stem is seated.
5. Assemble shut-off valve and pipe clamp and mount
it on the supply line. The inlet tube of the shut-off
valve must extend through the rubber washer and
into the 1/8-in. hole drilled in the line. Tighten the
packing nut. Tighten the clamp screws just enough
for the rubber gasket to ensure a watertight seal.
Clamping too tightly may crush the copper tubing.
USE ONLY
1/4” COPPER
TUBE TO
SHUT-OFF
VALVE
6. Slip the compression nut, and then the sleeve, on
the end of the 1/4-in. tubing. Insert the end of the
tube into the outlet end of the shut-off valve as far
as it will go, then screw the compression nut onto
the shut-off valve enough to get a watertight seal.
Place the other end in a sink drain or bucket.
Pipe Clamp
Inlet End
Packing
Nut
Rubber
Gasket
Shut-off
Valve
Outlet End
Compression
Sleeve
Installation & Maintenance
7. Turn on the main water supply. Turn the handle on
the shut-off valve counterclockwise to open the
valve and flush the tubing until the water runs clear,
then close the valve.
Inlet
Copper
Tube
NOTE: Make sure there is a vigorous flow of water
(volume and pressure).
8. Bend the tubing to run it to the installation location.
Position the tubing so it can enter the access hole
located in the right rear of the ice maker cabinet.
The tubing will extend beyond the cabinet front
when the cabinet is pushed back into position.
Compression
Nut
Figure 2-2. Water Connection Components
2-3
#3752200 - Revision B - May, 2006
Installation & Maintenance
Model 506 (UC Ice Maker)
Drain Connection Requirements
RIGHT END VIEW
The ice maker has a gravity drain. The ideal installation
has a standpipe (1-1/4-in. minimum) installed directly
below the outlet of the drain tube. (See Figure 2-3 and
Figure 2-4)
23-7/8”
3/4”
The drain tube must run into an open drain standpipe.
The drain tube cannot be “sealed” into the standpipe.
Water Inlet
Solenoid
Valve
1/4” O.D. Water
Line Compression
Fitting at Water
Valve
Because the drainage water will probably be very cold,
it may be desirable to insulate the drain standpipe thoroughly up to the drain inlet to minimize condensation on
the drain standpipe.
3-3/4”
7-1/2”
When a drain connection below the ice maker is not
available, a pump may be used to lift the water to an
available drain.
Bend Field Supplied Water Line
To Connect To Water Valve Fitting
Figure 2-3. Water System Connections
Condensate Pump Kit No. 759064 is no longer available as a service replacement. If a replacement is
needed, purchase a reliable condensate pump locally
and install Part No. 759014 shunt plug into the ice
machine pump receptacle. The condensate pump can
be installed on the floor directly behind the unit where it
is installed. Install the pump with the discharge tube to
the rear. Run a 5/8-in. I.D. plastic tube from the bin
drain directly into the pump inlet.
BACK VIEW
17-7/8”
34-13/32”
4” Long 5/8” I.D. Rubber
Drain Tube - Run to
Open Drain
C/
L
1-1/4” Min.
7-1/2”
3”
How It Works
9”
1-1/2”
The pump recommended for use with an undercounter
or freestanding ice maker is a pressure activated, high
speed pump which will lift water (from melting ice and
fill cycles) to a place where it can be disposed of.
Figure 2-4. Drain Tube Location
The drain pump has a
pressure switch that
cycles its pump.
The pump installs in the compartment below the ice
maker storage bin and operates on 120VAC 60Hz current. It receives the AC power from a receptacle that is
shunted except when the pump is present. Remove the
shunt, and plug pump into receptacle.
Add 5/8” I.D.
plastic hose from
drain pump to
drain bin outlet.
To drain
The pump connects directly to the drain stub of the storage bin. As the sealed chamber of the pump fills, the
pressure from the water actuates the pressure switch,
and causes the pump to run and pump water from the
chamber. (See Figure 2-5)
Power cord hole
Water exits through the tube leading to the drain and is
prevented from re-entering the chamber by a check
valve in the output fitting on the pump.
Water line hole
Figure 2-5. Condensate Pump
The impeller rotates at 3000RPM in a molded housing
designed to prevent cavitation.
The pump is a sealed unit that depends on the weight
of the water accumulating in the drain from the storage
bin to activate it. Make sure pump chamber and lid are
sealed to prevent water leakage, and that all connections are water tight.
#3752200 - Revision B - May, 2006
Hole for Field
Supplied Water
Line
2-4
Installation & Maintenance
Model 506 (UC Ice Maker)
How It Works (Continued)
Up &
Out to
Drain
When the pump is in harvest cycle, the electric circuit
bypasses the pump pressure switch, and the pump runs
continuously.
T
At all other times, regardless of any other switch setting
or condition, the pump is on line and will run when the
pressure switch closes.
1P
1V
If pump should fail to run when the pressure switch
closes, it interrupts the circuit to the fill valve so that no
additional water can enter. It also interrupts the circuit
to the hot gas defrost solenoid. (See Figure 2-6 and
Figure 2-7)
Check
Valve
In Fitting
Run the condensate pump power cord through the hole
in the wall and into the unit compartment. Inside the
unit compartment, remove the shunt from the receptacle and plug in the condensate pump. (See Figure 2-8)
Insert Drain
FM Cover
Figure 2-6. Water System Connections
Receptacle
NOTE: Do not discard the shunt that is removed from
the receptacle. This shunt must be replaced if the unit
is to be operated later without a condensate pump.
Tape shunt to wall of unit compartment to avoid loss.
Run the discharge line from the pump directly to the
available drain. The FSP condensate pump has a
check valve located in the discharge outlet valve.
Pressure
Switch
Drain
Pump
FSP
Condensate
Drain Pump
Other non-FSP sump pumps may be used with the ice
maker. These pumps are usually located near the
available drain. Run a 5/8-in. I.D. plastic tube from the
drain bin to the pump and a plastic hose from the discharge outlet of the pump into the available drain. If the
pump does not have a check valve on the discharge
outlet valve, one should be installed on the outlet tube.
The sump pump will be plugged into an available power
supply near the drain. A pressure switch inside the
pump will operate the pump as needed, independently
of the ice maker operation. The shunt remains in place
in the receptacle of the unit when a non-FSP sump
pump is used.
Figure 2-7. Pump Electrical Schematic
Shunt
Drain Pump
Power Supply
Cord
Figure 2-8. Shunt Location
2-5
#3752200 - Revision B - May, 2006
Installation & Maintenance
Model 506 (UC Ice Maker)
Installing the Unit
Screws
1. Lay carton on its rear face and break open the bottom flaps.
2. Set the carton upright with all four flaps outward.
To avoid damage to the finished floor when the unit
is installed, or if the unit needs to be removed for
service purposes, the finished floor should be protected with appropriate material.
Figure 2-9. Grille Removal
3. Lift carton up and off of unit.
4. Remove all of the packing tape and packaging
material from the outside and inside of the cabinet.
5. Remove the lower panel and grille by removing the
two securing screws at the bottom of the grille, and
pulling the lower panel assembly down and outward. (See Figure 2-9)
6. Reach into the unit compartment and turn the fan
by hand to make certain it moves freely.
7. Inside the bin, loosen the thumbscrews holding the
cutter grid and the water reservoir pan until they are
just thumb tight. (See Figure 2-10 and Figure 2-11)
8. Carefully move the ice maker into the installation
location, pulling the water supply line through the
hole in the rear. The water line will project through
the front of the unit after the ice maker is pushed
into position.
9. Check that the unit is level from side to side by
placing a level across the top of the cabinet.
10. If necessary, the ice maker should be shimmed so
that it is solid as well as level. Use a hard, permanent material, such as Masonite, for shims.
11. If the ice maker is installed under a counter top, a
custom Trim Kit, Part No. 819421 for the sides and
top is available from your FSP parts distributor.
12. After the ice maker is in place, bend the water supply tubing to meet the connection at the water inlet
valve. It may be necessary to trim the excess
length of tubing. Use the garden hose threaded
compression fitting supplied with the ice maker to
connect the water supply line to the unit.
CLEAN
OFF
Screws
Figure 2-10. Accessing Water Reservoir
Thumb Screws
Water Reservoir
Figure 2-11. Water Reservoir
After completing the water line connection, open the
water supply line valve and check for water tight seals
along the supply line.
Make sure the tubing inside the unit compartment does
not touch any other component in the compartment, to
prevent rattle.
#3752200 - Revision B - May, 2006
ON
2-6
Model 506 (UC Ice Maker)
13. Local sanitation codes may require that the ice
maker cabinet is sealed to the floor with an
approved caulking compound.
If the ice maker is installed in restaurant, local
codes may require that the unit be installed up off
the floor. The Part No. 876649 leg kit is no longer
available.
14. If the front panels are not going to be changed,
replace the lower panel and grille.
Installation & Maintenance
Screws
Handle
Screw
Handle Insert
Figure 2-12. Bin Door Handle Removal
Changing Front Panels
Front panels for the bin door and lower panel are available in different colors from your FSP parts distributor.
Some models of the Undercounter Ice Maker may
come with one or more additional colored panels inside
the bin door assembly. Each panel has two colors, one
on each side.
Where required by local codes, stainless steel panels
for installation of the unit in a restaurant, are also available.
Bin Door Panel
To change panels:
1. Open bin door.
2. Remove the two screws on top of the door, and
loosen the upper side screw on one of the sides.
(See Figure 2-12)
3. Spread the trim on one side, and remove the door
handle and top trim piece.
4. Slide the metal panel out and replace with the new
colored panel. (See Figure 2-13)
5. Reassemble the door.
6. Remove the screws on top of the lower panel
assembly (after it has already been removed from
the unit), spread the side trim, and slide out the
metal panel. (See Figure 2-14)
7. Replace with the new colored panel and reassemble the lower panel assembly. Make sure the galvanized metal panel is in place on the rear of the
lower panel assembly.
8. Replace the lower panel and grille assembly.
Figure 2-13. Bin Door Panel Removal
Screws
Lower Panel
Figure 2-14. Bin Door Panel Removal
Decorative wood panels to match the existing kitchen
cabinets can also be installed on the ice maker. The
consumer should order the panels from their kitchen
cabinet supplier. The panels should be beveled to no
more than 1/4-in. (6 mm) thick around the edges that
will fit under the trim.
When installing custom-made panels, break off the ribs
on the styrofoam insulation under each metal panel to
allow for the thickness of the wood panel. (See Figure
2-15)
Insulation Ribs
Figure 2-15. Bin Door Panel Removal
2-7
#3752200 - Revision B - May, 2006
Installation & Maintenance
Model 506 (UC Ice Maker)
Thermostat Calibrations
If the ice maker is installed in a location over 2000 feet
above sea level, the bin and evaporator thermostats
must be adjusted to compensate for the altitude.
On the control panel, under the escutcheon, on some
models of ice makers, there will be access holes to the
altitude adjustment control for each thermostat; and a
label with adjustment instructions will be on the front of
the control panel.
On other units, it will be necessary to remove the thermostats to make the adjustments and to read the
instructions stamped onto the thermostat housing.
NOTE: Make altitude adjustments on the thermostats
only to correct for the proper altitude of installation. Do
not make altitude adjustments on the thermostats to
correct other operational problems with the unit.
Water Deflector Installation
If the ice maker is installed aboard a ship, or a recreational vehicle where it will be operating while the RV is
moving, it is necessary to purchase and install a Water
Deflector Kit, Part No. 702354* from your FSP parts
Distributor.
Water Deflector
*The # 702354 water deflector kit is no longer used in
production and is not available as a service part.
Water Reservoir
The water deflector hangs in front of the evaporator and
keeps water flowing over the evaporator from spilling
into the storage bin area.
Figure 2-16. Water Deflector
Starting Up the Unit
Before using the ice maker, the consumer should wash
out the bin area with a baking soda solution (2 tablespoons of soda to a quart of warm water). Then rinse
thoroughly.
Make sure water supply and electric power is turned on.
Turn the service control switch to the “ON” position.
Allow the ice maker to run 3 hours before expecting ice,
and 24 hours before trying to adjust thickness control.
The ice maker has been factory set to produce ice
approximately 1/2-in. thick while operating in a room
ambient temperature of 70°F (21°C). Operation in different room ambient temperature may require adjusting
the ice thickness control.
The best and most efficient operation of the unit will be
obtained when the ice is manufactured between 1/2-in.
and 5/8-in. thick.
#3752200 - Revision B - May, 2006
2-8
Model 506 (UC Ice Maker)
Installation & Maintenance
Normal Consumer Maintenance
The minerals rejected from the circulating water during
the ice-making cycle may eventually form a hard scaly
deposit in the water system, inhibiting the release of the
ice slab from the evaporator.
CLEAN
Disconnect Harness
OFF
ON
It is necessary to periodically clean the units water system to remove the mineral scale build-up. The frequency of cleaning will depend on the hardness of the water.
To clean the water system:
1. Set the service control switch to the “OFF” position.
2. Open the bin door and remove the thumbscrews
that secure the ice cutter grid. Slide out the cutter
grid, and disconnect the grid wiring harness.
Cutter Grid
Figure 2-17. Water Deflector
If there is ice on the cutter grid, melt it off under
running warm water in sink. DO NOT try to pick
the ice off the grid wires. Attempting to pick the
ice slab off the cutter grid may stretch and damage grid wires.
3. Remove all of the ice from the bin and from the
evaporator freezing plate.
4. Remove the drain plug from the bottom of the water
reservoir pan. When the pan is completely drained,
replace drain plug.
5. Pour 1/2-gallon (approximately 2 liters) of hot tap
water into the water reservoir pan. Turn the service
control switch to the “CLEAN” position. Allow the
hot water to circulate for 5 minutes. This will warm
the system and make the cleaning solution more
effective.
6. While the hot water is circulating, prepare the ice
maker cleaning solution.
Thumb Screws
Water Reservoir
Insert into Drain
Drain Plug
Figure 2-18. Water Deflector
NOTE: Always wear gloves while handling ice maker
cleaner.
Preparing Cleaning Solution From Acid Crystals
Citric acid crystals are available from most pharmacies
and some plumbing supply houses. Mix 6 oz. (170 g)
of powdered citric acid crystals into 1/2 gallon of hot
water.
NOTE: Always mix the crystals into the entire 1/2 gallon
of water.
WHEN USING POWDERED ACID CRYSTALS TO
MAKE A CLEANING SOLUTION, USE ONLY CITRIC
ACID. DO NOT USE POWDERED PHOSPHORIC
ACID.
2-9
#3752200 - Revision B - May, 2006
Installation & Maintenance
Model 506 (UC Ice Maker)
Using a Commercially Prepared Cleaning Solution
Commercially prepared liquid ice machine cleaning
solutions are available from refrigeration and plumbing
supply houses.
WHEN USING A COMMERCIALLY PREPARED LIQUID CLEANING SOLUTION, USE ONLY A CITRIC
ACID BASED SOLUTION, OR A COMBINATION OF
CITRIC ACID AND PHOSPHORIC ACID BASED
SOLUTION. DO NOT USE MURATIC ACID OR ANY
OTHER ACID NOT APPROVED FOR USE IN A
FOOD MACHINE.
Carefully follow the instructions on the bottle of ice
maker cleaner to prepare 1/2 gal. (approx. 2 liters) of
cleaning solution.
Most ice machine cleaners are citric or phosphoric
acid which can cause irritation even after dilution.
In case of contact with eyes, flush eyes thoroughly
with fresh water and contact a physician immediately. In case of contact with skin, rinse well with
water. If swallowed, give large amounts of water
and contact a physician immediately. Do not
induce vomiting. KEEP OUT OF REACH OF CHILDREN.
11. Clean the scale off the side flanges of the evaporator freezing plate with a plastic scrubber dipped into
the prepared cleaning solution.
Always scrub in the direction of water flow (from
front to back on the side of the plate).
12. After draining out the cleaning solution from the
water reservoir pan, add 1/2 gal. of fresh water and
allow it to circulate for 5 minutes. Drain, and repeat
the rinsing process at least one more time.
13. Wash out the bin and inside the bin door with a soft
cloth and a warm water and baking soda solution.
14. Clean the exterior enamel surfaces and the gaskets
around the door with warm water and a mild soap
or detergent. Rinse and dry after washing.
DO NOT use a harsh or abrasive cleaner on the
exterior surfaces.
Use a good household appliance wax will help protect the exterior finish of the ice maker.
15. Replace the cutter grid. Make certain the drain plug
has been replaced in the bottom of the water reservoir pan. Turn the service control to the “ON” position and begin normal operation of the ice maker.
7. Turn the service control to the “OFF” position.
Drain the hot tap water from the water reservoir
pan. Replace drain plug when the pan is empty.
8. Turn the service control to the “CLEAN” position.
Carefully pour the entire 1/2 gal. of cleaning solution into the water reservoir pan.
If the cleaning solution starts to foam when it is
poured into the pan, stop pouring until foaming
stops, then resume pouring.
9. Allow the cleaning solution to circulate until the mineral build-up on the evaporator plate has dissolved.
If at the end of 30 minutes the mineral build-up has
still not dissolved, turn the service control to the
“OFF” position, and carefully drain out the cleaning
solution. Mix another 1/2 gal. of solution and add
as before.
10. While the cleaning solution is circulating, clean the
cutter grid by dipping it in a pan of prepared cleaning solution.
After allowing the grid to soak for approximately 15
minutes, use a hard bristled brush to scrub the wire
connectors and insulators around the edge of the
grid.
#3752200 - Revision B - May, 2006
2-10
Model 506 (UC Ice Maker)
Installation & Maintenance
Condenser Cleaning
It is necessary to periodically clean the air-cooled condenser to ensure efficient operation of the ice maker.
To clean the condenser:
1. Make sure the power is disrupted to the ice maker.
2. Remove the screws at the bottom of the grille and
remove grille and lower panel assembly.
3. Using a soft brush or a round dust brush attachment to a vacuum cleaner, remove lint and dirt from
the condenser fins.
4. Use a vacuum cleaner to remove dirt from the bottom of the unit compartment.
5. Replace the lower panel and grille assembly.
Reconnect the power supply.
Screws
Figure 2-19. Grille and Lower Panel Removal
TURN ICE MAKER OFF AND DISCONNECT FROM
THE MAIN POWER SUPPLY. CONDENSER FAN
ROTATION AND SHARP CONDENSER FINS COULD
RESULT IN PERSONAL INJURY.
DO NOT OPERATE ICE MAKER WITH LOWER
ACCESS PANEL OR CONTROL PANEL REMOVED.
DOING SO COULD RESULT IN DEATH, ELECTRICAL SHOCK OR PERSONAL INJURY.
Figure 2-20. Condenser Cleaning
2-11
#3752200 - Revision B - May, 2006
Installation & Maintenance
#3752200 - Revision B - May, 2006
Model 506 (UC Ice Maker)
2-12
Model 506 (UC Ice Maker)
Theory of Operation
SECTION 3
THEORY OF OPERATION
3-1
#3752200 - Revision B - May, 2006
Theory of Operation
Model 506 (UC Ice Maker)
OPERATING SYSTEMS
• Suction Line: The cool gas travels through the suction line which is also partially wrapped with the capillary tube. As this cool refrigerant gas travels through
the suction line it too absorbs heat from the warm liquid refrigerant traveling through the capillary tube.
This assures that it is a luke warm gas before it
enters the compressor, where the process begins
again.
There are three operating systems in the icemaker:
• Refrigeration System
• Water System
• Electrical System
Refrigeration System
NOTE: There is an additional component in the ice
maker refrigeration system which is used during the
harvest cycle, this component is called the hot gas
valve. Its function is described below:
The following components have been listed in the order
of refrigerant flow, with an explanation of their function
as part of the refrigeration system. (See Figure 3-1)
• Compressor: The compressor creates a high side
and low side pressure difference in the refrigeration
system by compressing the refrigerant gas, thus raising the pressure and temperature. During the ice
making cycle the compressor pushes this high-pressure/high-heat gas to the condenser.
• Condenser: The high-pressure/high-heat gas travels
through the condenser, where heat is dissipated by
cooler air being drawn over the condenser tubing by
the condenser fan. This changes the gas into a highpressure/warm liquid that then enters the filter-drier.
• Filter-Drier: The high-pressure/warm liquid travels
through the filter-drier, which removes moisture from
the refrigerant before it enters the capillary tube.
• Capillary Tube: The warm liquid refrigerant travels
through a skinny capillary tube which is wrapped
around the suction line and accumulator. As warm
liquid refrigerant travels through the capillary tube, it
gives up heat to the cool vapor refrigerant in the
accumulator and to the cool refrigerant gas traveling
through the suction line. As refrigerant in the capillary
tube gives up heat, the pressure drops, so it is a lowpressure/cool liquid before it enters the evaporator.
• Evaporator: A dramatic pressure drop occurs as the
low-pressure/cool liquid refrigerant leaves the small
diameter capillary tube and enters the larger diameter
evaporator tubing, and the refrigerant begins to
vaporize. This vapor travels through the evaporator
absorbing heat from the water being sprayed on the
evaporator. This cool vapor then enters the accumulator.
• Accumulator: Another pressure drop occurs as the
cool vaporized refrigerant leaves the evaporator tubing and enters the larger diameter accumulator tubing. Any liquid or vaporized refrigerant that may
remain at this point is converted to gas. The capillary
tube is wrapped around the accumulator to give up
heat to the refrigerant in the accumulator before it
enters the suction line.
• Hot Gas Valve: During a harvest cycle, the hot gas
valve interrupts the flow of high-pressure/ high-heat
gas from the compressor, diverting it past the condenser, filter-drier and capillary tube, directly to the
evaporator. This high-pressure/high-heat gas warms
the evaporator so that the ice slab releases from the
evaporator.
Evaporator
Capillary Tube
Accumulator
Condenser
Accumulating
Tube
Hot Gas
Valve
Heat
Exchanger
Condenser
Suction
Tube
Compressor
Drier
Figure 3-1. Refrigeration Overview
#3752200 - Revision B - May, 2006
3-2
Theory of Operation
Model 506 (UC Ice Maker)
Refrigeration Flow - Ice Making Cycle
During the later stages of the ICE MAKING cycle, as
the ice slab forms on the evaporator freezing plate,
some of the refrigerant passing through the evaporator
will not evaporate into a gas, but will remain a liquid.
This liquid refrigerant will settle in the accumulator while
the refrigerant gas will be sucked off through the suction tube at the top of the accumulator. This accumulated liquid refrigerant will be evaporated eventually by the
warmed refrigerant gas passing through the accumulator during the HARVEST cycle and during the beginning
of the next ICE MAKING cycle.
In the refrigeration system, (See Figure 3-2) the hot
gas refrigerant, under high pressure, is forced through
the condenser where heat is removed. The refrigerant
is condensed to a liquid, then flows through the drier
and capillary tube into the evaporator. Under low pressure in the evaporator, the liquid refrigerant absorbs
heat from the water flowing over the evaporator. The
refrigerant evaporates into a gas and passes into the
accumulator. As a low pressure gas, the refrigerant
flows back through the heat exchanger and suction
tube to the compressor.
NOTE: It is very important the accumulator is not tilted
out of a horizontal position.
During ICE MAKING cycle, some of the hot gas that is
in the condenser accumulating tube condenses to a liquid and remains in the accumulating tube.
Evaporator
Capillary Tube
Accumulator
Condenser
Accumulating
Tube
Hot Gas
Valve
Heat
Exchanger
Liquid Refrigerant
in Accumulating Tube
Condenser
Suction
Tube
High Pressure Refrigerant Gas
Compressor
Low Pressure Liquid Refrigerant
Low Pressure Refrigerant Gas
Drier
High Pressure Liquid Refrigerant
Figure 3-2. Refrigeration System (During Ice Making Cycle)
3-3
#3752200 - Revision B - May, 2006
Theory of Operation
Model 506 (UC Ice Maker)
Refrigeration Flow - Harvest Cycle
In the refrigeration system, (See Figure 3-3) the hot gas valve opens, allowing high pressure refrigerant gas to
bypass the condenser and flow through the condenser accumulating tube. The hot gas pushes the liquid refrigerant
that has accumulated in the accumulator tube up into the evaporator. The warmed liquid refrigerant helps to evenly
heat the evaporator plate so the ice slab releases quickly and evenly.
Capillary Tube
Evaporator
Accumulator
Condenser
Accumulating
Tube
Hot Gas
Valve
Heat
Exchanger
Path of Warm Liquid
Refrigerant Pushed
by High Pressure
Refrigerant Gas
Condenser
Suction
Tube
High Pressure Refrigerant Gas
Compressor
Warm Liquid Refrigerant
Low Pressure Refrigerant Gas
Drier
Figure 3-3. Refrigeration System (During Harvest Cycle)
#3752200 - Revision B - May, 2006
3-4
Theory of Operation
Model 506 (UC Ice Maker)
Water System
Evaporator
Freezing Plate
The water system provides fresh water necessary for
ice production, recycling this water as ice is produced.
The water system also flushes away rejected minerals
and contaminants, circulates cleaning solution during
the CLEAN CYCLE, and provides a means of drainage.
Distributor
Cutting Grid
The hardness of water supplied to the ice maker will not
only affect the quality of the ice produced, but may also
affect the operation of the water system.
Water Pump
Outlet Tube
A water softener or polyphosphate feeder will not cure
all problems associated with hard water, but they can
be used to reduce scale build-up in the ice maker.
Bin
Water Pump
Drain
Standpipe
NOTE: Some polyphosphate feeders will cause a slime
build-up in the water system when the water supply has
a low mineral content.
Reservoir
Pan
Water Inlet
Tube
Ice Making Cycle
In the water system, (See Figure 3-4) the water pump
moves the water from the reservoir pan up to the distributor, where it flows out over the evaporator freezing
plate. (See Figure 3-6)
From Water
Supply
Water Inlet
Valve
Water that does not freeze on the evaporator freezing
plate runs off the front edge and falls back into the
reservoir, where it is recycled back to the distributor.
(See Figure 3-5)
To Bin Drain
Figure 3-4. Water System
As the ice slab forms, the minerals in the water are on
the surface of the ice. The water flowing over the top of
the ice slab washes these minerals back into the water
reservoir pan. The water continues to recycle until the
ice slab reaches the desired thickness.
Figure 3-5. Water Flow on Evaporator
Figure 3-6. Water Flow Diagram
3-5
#3752200 - Revision B - May, 2006
Theory of Operation
Model 506 (UC Ice Maker)
Harvest Cycle
The ice slab, when released, slides off of the evaporator plate onto the cutting grid, where it begins to be divided into
individual cubes that fall into the bin. (See Figure 3-7 and Figure 3-8)
In the water system, the water valve opens allowing water to flow into the water reservoir pan. As the reservoir fills,
the mineral laden water from the previous ICE MAKING cycle is flushed out to the drain. (See Figure 3-9)
Figure 3-7. Ice Slab Sliding off of Evaporator
Figure 3-8. Cutting Into Cubes
Clean Cycle
In the water system, the water pump circulates the cleaning solution that has been added to the reservoir up to the
distributor, across the evaporator, and back into the reservoir where it is recirculated while the service control switch
is in the “CLEAN” position. (See Figure 3-10)
Out to Drain
Figure 3-9. Water Valve Open
#3752200 - Revision B - May, 2006
Figure 3-10. Clean Cycle Water Flow
3-6
Theory of Operation
Model 506 (UC Ice Maker)
Electrical System
The units electrical system provides power for the
refrigeration and water systems to operate, and controls
the operational cycling of the ice maker.
115
VOLTS
60 HERTZ
L
2
OFF
N
1
CLEAN
WATER
PUMP
6
ON 3
SERVICE
SWITCH
PLUG
CONDENSER
FAN
Units using a non-FSP sump pump.
RECEPTACLE
The sump pump is powered directly from an independent electrical power supply and is not controlled by the
ice maker.
HOT
N.C.
GAS SOLENOID
BIN
THERMOSTAT
1
3
2
N.C.
WATER
VALVE
SOLENOID
SHUNT
EVAPORATOR
THERMOSTAT
PRESSURE
SWITCH
115
VOLTS
S
OVERLOAD
CONDENSATE
DRAIN PUMP
COMPRESSOR
2
OFF
TRANSFORMER
60 HERTZ
L
R
START RELAY
N
1
CLEAN
WATER
PUMP
6
115 V
ON 3
8.5 V
SERVICE
SWITCH
PLUG
CONDENSER
FAN
UNIT SHOWN WITH GRAVITY DRAIN;
SERVICE SWITCH IN “OFF” POSITION;
BIN NOT FULL OF ICE.
RECEPTACLE
DOOR SWITCH
HOT
N.C.
GAS SOLENOID
BIN
THERMOSTAT
1
CUTTER GRID
Figure 3-11. Electrical System
2
3
N.C.
WATER
VALVE
SOLENOID
SHUNT
EVAPORATOR
THERMOSTAT
R
Unit with an FSP condensate pump installed.
S
OVERLOAD
115
VOLTS
60 HERTZ
L
2
OFF
CONDENSATE
DRAIN PUMP
COMPRESSOR
TRANSFORMER
N
START RELAY
115 V
8.5 V
1
CLEAN
UNIT SHOWN WITH GRAVITY DRAIN;
SERVICE SWITCH IN “OFF” POSITION;
BIN NOT FULL OF ICE.
WATER
PUMP
6
ON 3
PRESSURE
SWITCH
DOOR SWITCH
SERVICE
SWITCH
PLUG
CUTTER GRID
CONDENSER
FAN
Figure 3-13. Non FSP Sump Pump Diagram
RECEPTACLE
HOT
N.C.
GAS SOLENOID
BIN
THERMOSTAT
1
2
3
N.C.
WATER
VALVE
SOLENOID
SHUNT
EVAPORATOR
THERMOSTAT
PRESSURE
SWITCH
R
S
OVERLOAD
CONDENSATE
DRAIN PUMP
COMPRESSOR
TRANSFORMER
START RELAY
115 V
8.5 V
UNIT SHOWN WITH GRAVITY DRAIN;
SERVICE SWITCH IN “OFF” POSITION;
BIN NOT FULL OF ICE.
DOOR SWITCH
CUTTER GRID
Figure 3-12. FSP Condensate Pump Diagram
3-7
#3752200 - Revision B - May, 2006
Theory of Operation
Model 506 (UC Ice Maker)
Operational Cycles
115
VOLTS
60 HERTZ
L
There are three operational cycles of the ice maker:
1. ICE MAKING cycle
2. HARVEST cycle
3. CLEAN cycle
2
N
1
OFF
F
CLEAN
WATER
PUMP
6
ON 3
SERVICE
SWITCH
CONDENSER
R
FAN
RECEPTACLE
In addition, there are two operational OFF cycles of the
ice maker:
1. OFF cycle when bin is full of ice and service control
switch is turned to the “ON” position.
2. OFF cycle when the service control switch is turned
to the “OFF” position while power is still supplied to
the unit.
HOT
N.C.
GAS SOLENOID
BIN
THERMOSTAT
1
3
2
N.C.
WATER
VALVE
SOLENOID
SHUNT
EVAPORATOR
THERMOSTAT
R
S
OVERLOAD
When the ice makers service control switch is in the
“ON” position, and the bin is not full of ice, the evaporator thermostat determines whether the unit will be in the
ICE MAKING cycle or the HARVEST cycle.
COMPRESSOR
TRANSFORMER
START RELAY
115 V
8.5 V
DOOR SWITCH
The thickness control knob adjusts the evaporator thermostat to sense different temperatures on the evaporator freezing plate, which causes a different thickness of
ice.
UNIT SHOWN WITH GRAVITY DRAIN;
SERVICE SWITCH IN “ON” POSITION;
BIN NOT FULL OF ICE; NO DRAINAGE
WATER AT PUMP.
CUTTER GRID
Figure 3-14. Ice Making Cycle
115
VOLTS
60 HERTZ
L
ICE MAKING Cycle
2
In the electronic system, power is supplied through the
service control switch to the transformer, (which also
supplies power to the cutter grid and bin light through
the door switch), and through the bin thermostat to the
compressor. (See Figure 3-14)
N
1
OFF
F
CLEAN
WATER
PUMP
6
ON 3
SERVICE
SWITCH
PLUG
CONDENSER
R
FAN
RECEPTACLE
HOT
N.C.
GAS SOLENOID
BIN
THERMOSTAT
1
Power is supplied through the evaporator thermostat to
the condenser fan and the water pump.
2
If an FSP condensate pump is installed on the unit,
power is supplied to the condensate pump through the
receptacle. The condensate pump operates when
needed through a pressure switch in the pump itself.
(See Figure 3-15)
3
N.C.
WATER
VALVE
SOLENOID
SHUNT
EVAPORATOR
THERMOSTAT
PRESSURE
SWITCH
R
CONDENSATE
DRAIN PUMP
S
OVERLOAD
COMPRESSOR
TRANSFORMER
START RELAY
115 V
8.5 V
DOOR SWITCH
UNIT SHOWN WITH FSP CONDENSATE;
PUMP; SERVICE SWITCH IN “ON”
POSITION; BIN NOT FULL OF ICE;
DRAINAGE WATER AT PUMP; IN ICE
MAKING CYCLE.
CUTTER GRID
Figure 3-15. Ice Making with FSP Pump
#3752200 - Revision B - May, 2006
3-8
Theory of Operation
Model 506 (UC Ice Maker)
HARVEST Cycle
115
VOLTS
60 HERTZ
L
When the set temperature of the evaporator thermostat
is reached, the evaporator thermostat terminates power
to the fan and water pump, and supplies power to the
hot gas valve solenoid and the water fill valve solenoid.
On units where the shunt is still in the receptacle, the
power is supplied to the solenoids through the shunt.
(See Figure 3-16)
2
N
1
F
OFF
CLEAN
WATER
PUMP
6
ON 3
SERVICE
SWITCH
PLUG
CONDENSER
R
FAN
RECEPTACLE
HOT
N.C.
GAS SOLENOID
BIN
THERMOSTAT
1
3
2
N.C.
WATER
VALVE
SOLENOID
SHUNT
EVAPORATOR
THERMOSTAT
PRESSURE
SWITCH
R
CONDENSATE
DRAIN PUMP
S
OVERLOAD
COMPRESSOR
TRANSFORMER
START RELAY
115 V
8.5 V
DOOR SWITCH
UNIT SHOWN WITH GRAVITY DRAIN;
SERVICE SWITCH IN “ON” POSITION;
BIN NOT FULL OF ICE; IN HARVEST
CYCLE.
CUTTER GRID
Figure 3-16. Harvest Cycle
In units supplied with an FSP condensate pump
installed, power is supplied to the condensate pump
through the receptacle. The condensate pump runs
continuously during the HARVEST cycle. (See Figure
3-17)
115
VOLTS
60 HERTZ
L
2
N
1
OFF
F
CLEAN
WATER
PUMP
6
ON 3
Power is supplied to the solenoids through the condensate pump circuits. If the pressure switch in the condensate pump senses that the pump is not operating
properly (pumping out the water), the switch opens,
turning on the pump, and terminating power to the solenoids, thereby stopping the HARVEST cycle.
SERVICE
SWITCH
PLUG
R
CONDENSER
FAN
RECEPTACLE
HOT
N.C.
GAS SOLENOID
BIN
THERMOSTAT
1
2
3
N.C.
WATER
VALVE
SOLENOID
SHUNT
EVAPORATOR
THERMOSTAT
When the evaporator temperature rises, because of the
hot gas flow and because the ice slab has slid off, the
evaporator thermostat switches the unit to the ICE
MAKING cycle. This cycling, between the ICE MAKING
cycle and the HARVEST cycle, continues until the ice
bin is full.
PRESSURE
SWITCH
R
CONDENSATE
DRAIN PUMP
S
OVERLOAD
COMPRESSOR
TRANSFORMER
START RELAY
115 V
8.5 V
DOOR SWITCH
UNIT SHOWN WITH FSP CONDENSATE;
PUMP; SERVICE SWITCH IN “ON”
POSITION; BIN NOT FULL OF ICE;
DRAINAGE WATER AT PUMP; IN
HARVEST CYCLE.
CUTTER GRID
Figure 3-17. Harvest Cycle with FSP Pump
3-9
#3752200 - Revision B - May, 2006
Theory of Operation
Model 506 (UC Ice Maker)
OFF Cycle when the bin is full of ice and the service
control switch is in the “ON” position
115
VOLTS
60 HERTZ
L
2
In the electrical system, when the bin thermostat senses the bin is full of ice, power is cut off to all of the electrical system except for the transformer, cutter grid, bin
light and door switch. (See Figure 3-18)
N
1
F
OFF
CLEAN
WATER
PUMP
6
ON 3
SERVICE
SWITCH
R
CONDENSER
FAN
RECEPTACLE
HOT
N.C.
GAS SOLENOID
BIN
THERMOSTAT
1
3
2
N.C.
WATER
VALVE
SOLENOID
SHUNT
EVAPORATOR
THERMOSTAT
R
S
OVERLOAD
COMPRESSOR
TRANSFORMER
START RELAY
115 V
8.5 V
UNIT SHOWN WITH GRAVITY DRAIN;
SERVICE SWITCH IN “ON” POSITION;
BIN FULL OF ICE.
DOOR SWITCH
CUTTER GRID
Figure 3-18. Off Cycle, Switch ON
If an FSP condensate pump is installed, power will also
be supplied to the condensate pump through the receptacle. (See Figure 3-19)
115
VOLTS
60 HERTZ
L
2
N
1
OFF
F
The pump will operate when needed through a pressure switch in the pump itself.
CLEAN
WATER
PUMP
6
ON 3
SERVICE
SWITCH
PLUG
The refrigeration system and the water system do not
operate when the bin is full of ice.
CONDENSER
R
FAN
RECEPTACLE
HOT
N.C.
GAS SOLENOID
BIN
THERMOSTAT
1
2
N.C.
WATER
VALVE
SOLENOID
3
EVAPORATOR
THERMOSTAT
PRESSURE
SWITCH
R
CONDENSATE
DRAIN PUMP
S
OVERLOAD
COMPRESSOR
TRANSFORMER
START RELAY
115 V
8.5 V
DOOR SWITCH
UNIT SHOWN WITH FSP CONDENSATE;
PUMP; SERVICE SWITCH IN “ON”
POSITION; BIN FULL OF ICE;
DRAINAGE WATER AT PUMP.
CUTTER GRID
Figure 3-19. Off Cycle with FSP PUMP
#3752200 - Revision B - May, 2006
3-10
Theory of Operation
Model 506 (UC Ice Maker)
OFF Cycle when the service control switch is in the
“OFF” position but power is still supplied to unit.
115
VOLTS
60 HERTZ
L
2
On units with an FSP condensate pump installed,
power will continue to be supplied to the condensate
pump through the receptacle. The pump will operate
when needed through a pressure switch in the pump
itself. (See Figure 3-20)
N
1
OFF
CLEAN
WATER
PUMP
6
ON 3
SERVICE
SWITCH
PLUG
CONDENSER
FAN
RECEPTACLE
HOT
N.C.
GAS SOLENOID
BIN
THERMOSTAT
1
N.C.
WATER
VALVE
SOLENOID
3
2
EVAPORATOR
THERMOSTAT
PRESSURE
SWITCH
R
CONDENSATE
DRAIN PUMP
S
OVERLOAD
COMPRESSOR
TRANSFORMER
START RELAY
115 V
8.5 V
DOOR SWITCH
UNIT SHOWN WITH FSP CONDENSATE;
PUMP; SERVICE SWITCH IN “OFF”
POSITION; BIN NOT FULL OF ICE;
DRAINAGE WATER AT PUMP.
CUTTER GRID
Figure 3-20. Off Cycle, Switch OFF
CLEAN Cycle
115
VOLTS
60 HERTZ
L
In the electrical system, power is supplied to the water
pump through the service control switch. (See Figure
3-21)
2
N
1
OFF
CLEAN
WATER
PUMP
6
ON 3
SERVICE
SWITCH
CONDENSER
FAN
RECEPTACLE
HOT
N.C.
GAS SOLENOID
BIN
THERMOSTAT
1
2
3
N.C.
WATER
VALVE
SOLENOID
SHUNT
EVAPORATOR
THERMOSTAT
R
S
OVERLOAD
COMPRESSOR
TRANSFORMER
START RELAY
115 V
8.5 V
UNIT SHOWN WITH GRAVITY DRAIN;
SERVICE SWITCH IN “CLEAN”
POSITION; IN CLEAN CYCLE.
DOOR SWITCH
CUTTER GRID
Figure 3-21. Clean Cycle
3-11
#3752200 - Revision B - May, 2006
Theory of Operation
Model 506 (UC Ice Maker)
On units with an FSP condensate pump installed,
power will be supplied to the condensate pump through
the receptacle. The pump will operate when needed
through a pressure switch in the pump itself. (See
Figure 3-22)
115
VOLTS
60 HERTZ
L
2
N
1
OFF
CLEAN
WATER
PUMP
6
ON 3
SERVICE
SWITCH
PLUG
The refrigeration system does not operate during the
CLEAN cycle.
R
CONDENSER
FAN
RECEPTACLE
HOT
N.C.
GAS SOLENOID
BIN
THERMOSTAT
1
2
3
N.C.
WATER
VALVE
SOLENOID
SHUNT
EVAPORATOR
THERMOSTAT
PRESSURE
SWITCH
R
CONDENSATE
DRAIN PUMP
S
OVERLOAD
COMPRESSOR
TRANSFORMER
START RELAY
115 V
8.5 V
DOOR SWITCH
UNIT SHOWN WITH FSP CONDENSATE;
PUMP; SERVICE SWITCH IN “CLEAN”
POSITION; DRAINAGE WATER AT
PUMP; IN CLEAN CYCLE.
CUTTER GRID
Figure 3-22. Clean Cycle with FSP Pump
#3752200 - Revision B - May, 2006
3-12
Model 506 (UC Ice Maker)
Theory of Operation
WHAT’S IN WATER
INGREDIENT
EFFECT
CORRECTION
A. IT AFFECTS ICE QUALITY
Algae or Sulfides
Objectionable Taste and Odor
Carbon Filter
Minerals:
Sodium
Potassium
Magnesium
Calcium
Cloudy Ice
Slow Cutting
Refreezing
1. Check:
a. Water flow restriction
b. Correct siphoning
2. Polyphosphate feeder or water
softener.
3. Change water source.
B. IT AFFECTS ICE MAKER
Iron
Chlorine
Manganese
Staining
(Aesthetic only)
1. Citric acid or liquid ice machine
cleaner. (Citric acid works best.)
2. Water softener AND iron filter.
Permanent
Hardness
Calcium or Magnesium
Sulfates
Chlorides
Nitrates
Scale
1. Abrasive cleaning.
2. Polyphosphate feeder or water
softener reduces or eliminates
abrasive cleaning.
Temporary
Hardness
Calcium or Magnesium
Carbonates
Scale
1. Liquid ice machine cleaner.
2. Polyphosphate feeder or water
softener reduces frequency of
cleaning by 50%.
RECOMMENDATIONS
Water softeners and polyphosphate feeders are not cure-alls, but do reduce (and in some cases, prevent) scale
buildup. They are particularly effective in controlling sulfate scale, which is rocklike and can be removed only
by sanding, scraping or chiseling.
CAUTION: Some polyphosphate feeders cause slime buildup, so their use in low mineral content water should
be carefully considered.
When the ice slab takes too long to divide into cubes because the water supply has a high mineral content, a special
replacement transformer (Part No. 2165483) is available from your FSP parts distributor. This transformer has a
selectable 11-volt tap that will increase the heat of the cutter grid wires, helping to divide the ice slab into cubes
faster.
Also, a service replacement flow washer (Part No. 588930) for the water inlet valve is available from your FSP parts
distributor. This flow washer will increase the flow of water supply during the HARVEST cycle, helping to wash out
the accumulated minerals in the water reservoir.
3-13
#3752200 - Revision B - May, 2006
Theory of Operation
Model 506 (UC Ice Maker)
WHAT’S IN WATER
C. WATER TESTING
Water testing is necessary to determine the amount of minerals in a water supply that affect ice and the ice maker.
T.D.S.
(Total Dissolved Solids) is the test for the total
concentration of all minerals present in the water.
Chlorides
Alkalinity
Total Hardness
are tested to determine the degree of cloudy ice and
scale buildup.
Small concentrations of minerals do not affect the ice quality or cause excessive scale buildup. However, amounts
which have an adverse effect are:
TEST
CONCENTRATION
EFFECT ON ICE
EFFECT ON ICEMAKER
T.D.S.
50-1000 ppm
or higher
Cloudy, Slow Cutting,
Refreezing
Temporary and Permanent
Scale Buildup
Chlorides
200-300 ppm
or higher
Major Cause of Cloudy Ice,
Slow Cutting, Refreezing
Temporary and Permanent
Scale Buildup
Alkaloids
300-400 ppm
or higher
Cloudy, Slow Cutting,
Refreezing
Temporary and Permanent
Scale Buildup
Total
Hardness
5-10 GPG*
(100-170 ppm)
Clear Ice
Minimal Scale Buildup
10-15 GPG
(170-255 ppm)
Slightly Cloudy
Moderate Scale Buildup
15-20 GPG
(255-340 ppm)
Noticeably Cloudy, Possible
Slow Cutting and Refreezing
Serious Scale Buildup
20 GPG and Up
(340 ppm and Up)
Severely Cloudy
Slow Cutting, Refreezing
Excessive Scale Buildup
* Grains per Gallon
NOTE: Water treatment companies usually have the equipment to test water. Most city water departments can supply information concerning the mineral content in water.
#3752200 - Revision B - May, 2006
3-14
Model 506 (UC Ice Maker)
Component Access & Removal
SECTION 4
COMPONENT ACCESS AND
REMOVAL
4-1
#3752200 - Revision B - May, 2006
Component Access & Removal Model 506 (UC Ice Maker)
COMPONENT ACCESS AND REMOVAL
This section explains how to access and remove components in a Model 506 undercounter ice maker.
This section is arranged as follows: Exterior components; followed by the internal components; followed by compressor area components. An attempt has been made to arrange these procedures in such a way as to simulate
which components would need to be removed first in order to gain access to other components. When following a
component removal procedure, it may be necessary to reference another component removal procedure listed earlier in this section.
NOTE: Before continuing, please take note of the WARNINGS and CAUTIONS below.
TO AVOID ELECTRIC SHOCK, POWER TO THE UNIT MUST BE DISCONNECTED WHENEVER ACCESSING
AND/OR REMOVING COMPONENTS POWERED BY ELECTRICITY OR COMPONENTS NEAR OTHER ELECTRICAL COMPONENTS.
•
If removing or disconnecting door hinge assemblies, remember they are spring loaded and may
recoil quickly when released.
•
If working in the compressor area, remember that compressor and tubing may be hot.
•
If working on or around the condenser, remember that condenser fins are sharp.
#3752200 - Revision B - May, 2006
4-2
Model 506 (UC Ice Maker)
Component Access & Removal
Control Panel
The service control switch, evaporator thermostat control, bin thermostat control, and the transformer are
located behind the control panel. They are all secured
to the control panel with screws that pass through the
front of the control panel. To remove the control panel:
CLEAN
Eschcheon
1. Remove the control knobs from control panel.
2. At each end of the control panel, remove the
screws located on the underside of panel. (See
Figure 4-1)
3. Pull the escutcheon off of unit.
4. If present, remove the wire leads to the door switch.
5. Extract screws that secure control panel to the cabinet.
6. Carefully pull control panel down, and tilt outward.
7. Remove control panel components by first disconnecting wire leads from component terminals. (See
Figure 4-2)
8. Extract screws that pass through the front face of
the control panel and fasten into the component
being removed.
OFF
ON
Screw Locations
Figure 4-1. Eschcheon Removal
Service
Control
Switch
Control Panel Component Testing
Evaporator
Thermostat
Bin
Thermostat
Transformer
Backside Of Control Panel
Service Control Switch
Figure 4-2. Control Panel Components
NOTE: See WARNING at beginning of this section.
Terminal 6
The service control switch is a manually operated three
position rotary switch.
To
1.
2.
3.
Copper Plate
test:
Remove wire leads.
Use an ohmmeter set on the R x 1 scale.
With switch in the “ON” position, check across terminals. (See Figure 4-3)
Terminal 1
Terminal 3
Terminal 2
Figure 4-3. Service Control Switch Test Locations
4. With switch in the “CLEAN” position, check across
terminals.
4-3
#3752200 - Revision B - May, 2006
Component Access & Removal Model 506 (UC Ice Maker)
Evaporator Thermostat
Terminal 1
Terminal 3
The evaporator thermostat is adjustable for altitude correction. In the warm position, the thermostat cuts in at
38°F ± 2° and cuts out at 10.5°F ± 4°. In the cold position, the thermostat cuts in at 38°F± 2°, and cuts out at
-3°F± 2.5°
To
1.
2.
3.
test, method 1:
Remove wire leads.
Use an ohmmeter set on the R x 1 scale.
Feel the evaporator freezing plate. Then check
across the terminals. (See Figure 4-4)
If evaporator is cold:
Terminal 2
Figure 4-4. Evaporator Thermostat Test Locations
If evaporator is warm:
To test, method 2:
1. Remove wire lead from terminal 6 on the service
control switch (disabling the water pump). (See
Figure 4-5)
2. Reassemble the unit.
3. Reconnect the power supply to unit.
4. Turn the control service switch to the ”ON” position.
5. Feel the evaporator plate. It should first get cold,
then warm.
Terminal 6
Copper Plate
With the load removed from the evaporator, the evaporator thermostat should cycle into the HARVEST cycle
within a matter of minutes.
Figure 4-5. Remove Wire From Terminal 6
#3752200 - Revision B - May, 2006
4-4
Model 506 (UC Ice Maker)
Bin Thermostat
Component Access & Removal
To Well in Liner
The bin thermostat operates automatically and is
adjustable for altitude correction. The bin thermostat
cuts in at 41°F R1.5, and cuts out at 35°F R1.5.
The control capillary bulb thermostat is located in a well
on the left side of the bin liner.
If the bin thermostat is replaced, it is necessary to carefully make a few bends in the capillary tubing before it
is threaded into the well, to make certain that the capillary bulb touches the inside wall of the well.
To
1.
2.
3.
test:
Remove the wire leads.
Use an ohmmeter set on the R x 1 scale.
Check between terminals. (See Figure 4-6)
Terminals
When the thermostat well is warm, the terminals should
read on the ohmmeter as a closed circuit.
Figure 4-6. Bin Thermostat Test Locations
When the thermostat well is cold (hold ice against well),
the terminals should read on the ohmmeter as an open
circuit.
Transformer
The transformer has a 115 Volt, AC primary coil, with a
secondary coil that produces 8.5 Volts at 2 Amps.
A special replacement service transformer is available
from your FSP parts distributor with a selectable 11-volt
tap. This higher voltage will slightly increase the heat of
the cutter grid wires. If the water supply to the icemaker has a high mineral content, the ice will have a higher
melting temperature. The warmer grid wires will help
divide the ice slab into cubes faster.
To
1.
2.
3.
Electrical Leads
test:
Remove the wire leads. (See Figure 4-7)
Attach a 120-volt test cord to the primary coil.
Use a voltmeter to test across the terminals of secondary coil. The meter should indicate 8.5 volts AC.
Figure 4-7. Transformer
Door Light Switch
If present on the unit, the switch is located on the bottom left of the escutcheon.
To
1.
2.
3.
test:
Remove the wire leads.
Use an ohmmeter set on the R x 1 scale.
Test across the terminals. The ohmmeter should
indicate a closed circuit.
Then depress switch and test. The ohmmeter
should indicate an open circuit.
4-5
#3752200 - Revision B - May, 2006
Component Access & Removal Model 506 (UC Ice Maker)
Bin Area Components
CLEAN
Bin Door
OFF
ON
To remove the bin door:
1. Open the door and snap out the ice retainer by flexing it and slipping it off the retaining studs. (See
Figure 4-8)
2. Remove the screw closest to the door hinge on
either the right side or left side of door. (See Figure
4-9)
3. Remove soft white plastic filler plug covering door
hinge pin on side where the screw was removed.
4. Spread the trim piece free from the door.
5. Press down on inside of door liner next to hinge,
while pulling the door up and off of the hinge pin.
6. Close the door to a 30 degree open position, and
slide the door off of the hinge pin on the other side.
Ice Retainer
Figure 4-8. Ice Retainer Removal
Screw
Friction Door Catch
The catch is located on the bottom of the escutcheon.
It can often be adjusted by adding washers under the
catch. If these does not correct the problem, the catch
should be replaced.
Cutter Grid
Figure 4-9. Bin Door Removal
NOTE: See WARNING at beginning of this section.
The cutter grid is an arrangement of incoloy wires supported by a four sided frame in a manner to form
squares. There are two cutter grids available. (See
Figure 4-10)
1-1/4” x 1-1/4” Cutter Grid
The cube cutter grid has wires that produce ice cubes
that are 1-1/4 inches by 1-1/4 inches. The wires are
arranged in a single circuit.
The cubelet cutter grid has wires that produce ice
cubelets that are 3/4 inch by 3/4 inch. The wires are
arranged in two parralel circuits.
3/4” x 3/4” Cutter Grid
Figure 4-10. Bin Door Removal
#3752200 - Revision B - May, 2006
4-6
Model 506 (UC Ice Maker)
Component Access & Removal
Cutter Grid (Continued)
To remove and check:
CLEAN
Electrical Harness
Before removing the grid, while the unit is operating,
feel the grid wires. They should feel warm to the touch.
1. Remove the thumb screws that are in front of the
cutter grid assembly. (See Figure 4-11)
2. Carefully pull the cutter grid out.
3. Unplug cutter grid from the units wiring harness.
4. Visually check the wiring plug. It should be free of
mineral build-up. The plastic plug should not show
any sign of melting. (Excessive mineral build-up on
the plug terminals can cause the plug to overheat.)
5. Visually check the grid wires. They should be taut
and free of mineral build-up. They should not have
black spots where the wires have sagged and
touched each other. If wires are bad, the entire cutter grid should be replaced.
6. Visually check the terminals, insulators and frame.
They should all be free of mineral build-up. The
insulators should not show any signs of melting.
If the terminals, insulators or frame are bad, the
entire cutter grid should be replaced.
OFF
ON
Thumb Screws
Figure 4-11. Cutter Grid Removal
Lamp Bracket
Bin Light
If present, the bin light will be located on the cutter grid
assembly.
To replace the light bulb it is necessary to remove the
cutter grid assembly and the plastic light shield. (See
Figure 4-12)
Pull Shield to
Release Tab
Figure 4-12. Bin Light Removal
Water Reservoir Pan
The reservoir pan is a plastic tub with a drain hole and
an overflow boss to which a drain tube is mounted.
The pan is located under the evaporator toward the rear
of the inside of bin.
To remove (See Figure 4-13):
1. Though not necessary, it is recommended that the
bin door be removed for easier access.
2. Remove thumbscrews at the top of reservoir pan.
Thumbscrews
Water Pan
3. Pull out the reservoir pan and check for mineral
build-up, slime or mildew.
A water inlet tube runs into the reservoir pan from the
water inlet valve in the unit compartment. The tube
must be secured in notch on the water pump bracket.
Insert Into Drain
A plastic drain tube runs from the overflow boss, or
standpipe, on the reservoir pan down through bin drain.
Drain Plug
Figure 4-13. Bin Light Removal
4-7
#3752200 - Revision B - May, 2006
Component Access & Removal Model 506 (UC Ice Maker)
Water Pump
The water pump is mounted on a bracket on the back
of the bin and sits in the water pan. The water pump is
supplied with an internal overload protector and rotates
at 3350 RPM. (See Figure 4-14)
Motor
Fan
To remove:
1. Though not necessary, it is recommended that the
bin door be removed for easier access.
2. Remove the water reservoir pan.
3. Remove the screws that secure the pump to the
mounting bracket on the back bin wall.
4. Snap out the water inlet tube from the notch on the
water pump bracket.
5. Remove the water pump outlet tube.
6. Pull the pump forward, out of the socket on the rear
bin wall.
Mounting
Bracket
To test:
1. Attach a 120-volt test cord to the water pump plug
(the top two pins). The pump should operate when
power is supplied.
2. Visually check the water pump plug and the socket
on the rear bin wall. They should both be free of
mineral build-up and any signs of overheating.
3. Check the agitator arm on the bottom of the water
pump. It is very important that this arm is not broken off while removing or replacing the pump.
Grommets
Pump
Impeller
Agitator
The agitator arm breaks up bubbles in the water
and prevents an airlock from forming in the impeller
area of the pump.
Figure 4-14. Water Pump
If the agitator arm is broken off, water may be
prevented from being pumped up to the distributor.
An improperly operating agitator can also cause
other ice making problems and low quality ice.
If there are any problems with pump impeller or agitator, the entire water pump should be replaced.
#3752200 - Revision B - May, 2006
Motor
4-8
Model 506 (UC Ice Maker)
Component Access & Removal
Evaporator
The evaporator freezing plate is located directly behind
the cutter grid assembly.
ALL AUTHORIZED SERVICERS MUST UTILIZE A
CFC RECOVERY AND HANDLING PROGRAM
THAT MEETS ALL THE REQUIREMENTS OF
LOCAL, STATE AND FEDERAL LAWS AND REGULATIONS.
The evaporator thermostat capillary bulb is attached
to the underneath side of the evaporator plate. At least
8 inches of the thermostat capillary bulb must be bent
into an 'M* shape and attached tight against the bracket
on the bottom side of the evaporator plate.
The capillary tube of the refrigeration sealed system
is soldered directly against the front edge of the evaporator plate. This prevents the ice slab from forming a
lip over the edge.
Evaporator
At least one inch of the thermostat capillary bulb should
be taped to the refrigeration system capillary tube at
the front edge of the evaporator plate. This helps to
shorten the HARVEST cycle.
Thumbscrew
The upper surface, and side flanges, of evaporator
freezing plate must be free of mineral build-up, and be
smooth and even. A nick or scratch could cause the ice
slab to hang up during the HARVEST cycle.
If evaporator plate is cleaned with a plastic scrubber,
always scrub in the direction of water flow (front to
back). If plate is scratched during cleaning, it will not
hinder the ice slab from sliding off. The evaporator plate
can be dropped for better access.
Figure 4-15. Evaporator and Side Bracket
Side Brackets
To drop:
1. Though not necessary, it is recommended that the
bin door be removed for easier access.
2. Remove the cutter grid assembly, water reservoir
pan, and water pump.
3. Remove the thumb screws on the side brackets at
the front of the evaporator plate.
4. Carefully pull the evaporator forward and down.
Be careful not to bend or kink the attached tubing.
The evaporator can be pulled forward to the front
of the bin area where the unit compartment is
pulled forward.
Plastic side brackets are attached to the front of each
side of the evaporator freezing plate with thumb screws.
(See Figure 4-15)
The brackets support the cutter grid, the water reservoir, and the evaporator.
NOTE: If a component in the refrigeration sealed system must be replaced, it is necessary to use an
approved method of accessing the sealed system.
Refer to the Job Aids below to provide information to
determine whether other system components in the
sealed system needs replacing and to provide the
approved method of accessing, servicing and recharging the sealed system. Refrigerant recovery is also
covered.
4321717 Sweep Charge Procedure for the 90's.
4378421 Refrigerant Recovery Process.
4-9
#3752200 - Revision B - May, 2006
Component Access & Removal Model 506 (UC Ice Maker)
Distributor
The water distributor is a 5/8” diameter molded
plastic tube with small holes, and rubber caps in each
end. It distributes water evenly over the entire evaporator plate surface. (See Figure 4-16)
To remove:
1 . Though not necessary, it is recommended that the
bin door be removed for easier access.
2. Remove the cutter grid assembly, water reservoir
pan, and water pump.
3. Drop the evaporator.
4. Disconnect the water tube that came from the
water pump.
5. Pull the distributor out.
Rubber
End Caps
The rubber end raps can be removed and the distributor cleaned with a small brush and a mild detergent
solution. Each of the small holes in the distributor
must be unrestricted.
Built-in
Restrictor
There is a built-in water restrictor at the inlet end of
the distributor. The restrictor controls the amount of
water running over the evaporator. The restrictor cannot be plugged.
Figure 4-16. Water Distributor
If a distributor is replaced, it is very important to use
the proper size distributor. If the wrong size distributor
is installed in an ice maker, water may flow over into
the bin area.
When replacing the distributor, note that the small stubs
on the outside of the rubber end caps fit into notches
on the rear of the side flanges of the evaporator plate.
Also, there are small plastic nubs along the back side
of the distributor. After the distributor is installed onto
the rear of the evaporator plate, it should be turned
downward until these nubs are tight against the back
of the evaporator.
#3752200 - Revision B - May, 2006
4-10
Model 506 (UC Ice Maker)
Component Access & Removal
Components in Unit Compartment
Accessing the Unit Compartment
The water inlet valve, the hot gas valve, the compressor
(and starting relay and overload protectors), the condenser, the condenser accumulating tube, the condenser fan and drier are located in the unit compartment.
To access the unit compartment:
1. Remove the two (2) screws at the bottom of grille.
(See Figure 4-17)
2. Pull the lower panel and grille assembly down and
outward, releasing it from the two clips at the top.
Screws
There is a baffle separating the unit compartment.
During operation of the unit, the air is pulled in through
the lower grille on the right side of the baffle, across the
condenser, and is pushed out through the lower grille
on the left side of the baffle.
Figure 4-17. Grille Removal
To remove baffle:
1. Remove the screws on the compressor side that
secure the baffle in place and carefully remove.
It is always important that the baffle is replaced properly. If baffle is not in place during operation, warm air
could be continually recirculated through the unit area,
resulting in inefficient operation and low quality ice.
To pull out the unit compartment:
1. Remove the door, cutter grid assembly, the water
reservoir pan, water pump, lower panel and grille
assembly, and the baffle.
2. Drop the evaporator.
3. Remove the screws that secure the shell front, and
pull out the shell front.
4. Remove wire leads from hot gas valve, water inlet
valve and the compressor starting components.
5. Remove the inlet and outlet water tubes from the
water inlet valve.
6. Loosen the bolts on the side rails at the bottom of
the unit compartment.
7. Snap out the retaining spring clips along the left
side of the front bin seal.
8. Carefully pull out the unit compartment several
inches. Be careful to guide the sealed system tubing forward, through the left side of the bin, and
through the slit in the upper left front corner of the
bin. Also, carefully guide the evaporator forward.
9. Remove the wire leads from the compressor fan
when they become accessible while the unit compartment is being pulled out.
10. Pull the unit compartment out as far as it will come.
Figure 4-18. Unit Compartment
4-11
#3752200 - Revision B - May, 2006
Component Access & Removal Model 506 (UC Ice Maker)
Condenser Fan
The condenser fan has a 3-watt motor that turns the fan
blade at 1200 RPM. When facing the motor shaft, the
fan blade will turn counterclockwise. To check or
remove the condenser fan, the unit compartment will
need to be pulled out of the unit.
Condenser Fan
To check:
1. After removing the wire leads, use an ohmmeter set
on the R x 1 scale.
2. Check across terminals. The ohmmeter should
read approximately 75 ohms.
Screw
The motor can also be checked by attaching a 120 volt
test cord to the terminals. When power is supplied, the
fan should operate.
Figure 4-19. Condenser Fan
To remove:
1. Remove screws that secure the fan bracket to the
base of the unit compartment. (See Figure 4-19)
2. Pull out the fan and bracket.
3. Remove the screws that secure the fan to the fan
bracket.
Valve Body
80 Mesh Screen
Water Inlet Valve
The water inlet valve is located in the front of the unit
compartment. The valve features a spring-loaded solenoid and has an 80-mesh screen in the water inlet.
Figure 4-20. Water Inlet Valve
To check:
1. After removing the wire leads, use an ohmmeter set
on the R x 100 scale.
2. Test across the terminals. The ohmmeter should
read approximately 250 ohms.
Screw
Coil
Bracket
Guide
A flow washer in the water inlet valve controls water
flow to approximately 1 quart of water per minute at a
supply pressure of between 20 and 120 pounds psi.
Armature
Diaphragm
Body
To check for proper water flow:
1. Reconnect the water supply tube to the inlet side of
the water valve.
2. Attach a tube to the outlet side of the water valve.
Place the other end of tube in a quart jar held over
a pan to catch any overflow.
3. Attach a 120 volt test cord to terminals.
4. Supply power to water valve for 1 minute. During
this time, one quart of water should flow into jar. If
not, check wire mesh and flow washer for obstruction, then disassemble water valve. (See Figure 421)
Spring
Flow Washer
Retainer
Screen
Figure 4-21. Exploded View of Water Inlet Valve
NOTE: When reassembling the flow washer, note that
the side of the washer with lettering must face away
from the body of the valve.
#3752200 - Revision B - May, 2006
4-12
Model 506 (UC Ice Maker)
Compressor and Starting Components
Component Access & Removal
Starting Relay
Starting Relay
The starting relay is a magnetic current type that plugs
directly onto the compressor terminals. The unit compartment will need to be pulled out to access the compressor and the starting components. (See Figure 4-22)
To test:
1. Remove the relay from the compressor.
2. Use an ohmmeter set on the R x 1 scale. With the
relay held upright in the same position as it was
mounted on the compressor, place the meter
probes into the R and S terminal sockets. The
ohmmeter should read an open circuit.
3. With the meter probes still in the R and S terminal
sockets, invert the relay. The ohmmeter should
read a closed circuit.
Overload Protector
Figure 4-22. Starting Relay
Screw
Compressor Overload Protector
The compressor overload protector is mounted with the
starting relay, and is sensitive to the current load and to
the compressor temperature.
To test:
1. With the relay removed from the compressor, use
an ohmmeter set on the R x 1 scale.
2. Check across the overload terminals. The ohmmeter should show an open circuit.
Overload
Washer
Relay
Assembly
Sleeve
Washer
Terminal Cover
Compressor
To test:
1. Remove the starting components.
2. Use an ohmmeter set on the R x 10K scale. Check
from each terminal (C,S and R) to compressor
housing. The meter probe on the compressor
housing should be placed on the grounding blade,
or in an area that is free of paint, such as a stub.
3. Next, set ohmmeter on the R x 1 scale. Test across
terminals R and C. The ohmmeter should read
approximately 2.5 ohms.
4. Test across terminals C and S. The ohmmeter
should read approximately 2.5 ohms.
5. Attach a 120 volt test cord to the compressor as
shown. (See Figure 4-24)
If the compressor does not start, but an audible hum is
heard, replace compressor.
If compressor starts with test cord, but refuses to run
when the icemaker is operating, check for loose wiring,
a defective relay, or a defective bin thermostat.
Figure 4-23. Compressor Components
Circuit Breaker
Fuse
Compressor
Terminals
C
R
S
Momentary
Switch
Figure 4-24. Compressor Test Cord Connection
To remove (See Figure 4-23):
1. Before removing the compressor, capture the refrigerant from the sealed system.
2. Remove terminal cover from side of compressor.
3. Disconnect electrical leads from overload/ relay
assembly.
4. With a a tube cutter, cut suction and discharge lines
approximately one inch from compressor ports.
5. Extract screws from corners of compressor, remove
compressor from unit.
4-13
#3752200 - Revision B - May, 2006
Component Access & Removal Model 506 (UC Ice Maker)
Condenser
Condenser
The condenser is attached to the base assembly with
screws that pass through the condenser base then are
secured to the unit area base. The condenser fan
shroud is attached to the back of the condenser with
screws passing through the shroud into the rear side
flanges of the condenser. The inlet port of the condenser is attached to the compressor discharge line. The
condenser outlet leads to the high-side filter-drier.
To access the condenser, pull out the unit compartment
to access the sealed system components.
1. Extract screws securing the front deflector to the
side of the condenser.
2. Extract screws securing the fan shroud to the back
of the condenser.
3. Before removing the condenser, capture the refrigerant from the sealed system.
4. Then, cut the compressor discharge line and drier
inlet line approximately one inch from the condenser inlet and outlet ports.
5. Lift the condenser off of the base assembly. (See
Figure 4-24)
Fan Shroud
Screws
Figure 4-24. Condenser Components
Screw
Coil Harness
Clamp
NOTE: It is not recommended to sweat tubing apart.
Doing so will induce moisture into the sealed system.
Solenoid Coil
Electrical
Leads
Hot Gas Valve
Valve Body
The hot gas valve must be installed vertically as the
valve uses a free plunger that seats by gravity. This
plunger must seat properly for efficient operation of the
ice maker. (See Figure 4-25)
Filter-Drier
If there is a small leak in the valve, the outlet tube from
the valve will feel cold, and may frost up, during the ICE
MAKING cycle. This is caused by the small leak acting
as an orifice for the refrigerant gas.
If there is a medium size leak in the valve, the outlet
tube from the valve will feel warm during the ICE MAKING cycle.
If the outlet tube from the valve is hot during the ICE
MAKING cycle, the hot gas valve is stuck open.
To check:
1. With wire leads removed, use an ohmmeter set on
the R x 100 scale.
2. Check across terminals. the ohmmeter should read
approximately 250 ohms.
3. Attach a 120-volt test cord to the terminals. When
power is supplied to the valve an audible click
should be heard.
#3752200 - Revision B - May, 2006
Figure 4-25. Hot Gas Valve Components
To remove:
1. Before removing the hot gas valve, capture refrigerant from the sealed system.
2. Disconnect coil harness from solenoid.
3. Extract screw from top of solenoid.
4. With a file, score a line around capillary tubes 1” or
less from valve inlet and outlet tubes, then fatigue
capillary tubes at these lines until they separate.
NOTE: Whenever servicing the sealed system, the filter-drier must be replaced.
NOTE: After capillary tube separates, check tubing for
internal burrs. If burrs exist, repeat step 1 above.
4-14
Model 506 (UC Ice Maker)
Parts Lists & Exploded Views
SECTION 5
PARTS LISTS &
EXPLODED VIEWS
5-1
#3752200 - Revision B - May, 2006
Parts Lists & Exploded Views Model 506 (UC Ice Maker)
506 CABINET, LINER & DOOR PARTS LIST (Prior to Serial #1181341)
Ref #
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
40.
41.
43.
44.
45.
46.
47.
48.
#3752200 - Revision B - May, 2006
Part #
758848
758652
756330
819361
758652
593104
758748
758748
593184
593185
681459
488437
756350
758169
596023
758921
965173
596807
965173
681542
758492
758220
561814
596605
756662
758888
598894
585158
241428
681613
758713
758716
680930
596715
755677
758754
681196
758718
681534
758769
758770
758771
758889
488661
758901
Description
Shell
Front, Shell
Door, Inner Bin
Liner, Door
Plug, Hinge
Strip, Tapping
Trim, Door - RS
Trim, Door - LS
Rail, RS
Rail, LS
Screw, 8-32 x 1/2
Screw, Harness - Ground
Liner
Gasket, Bottom
Clamp
Gasket
Screw, 8-32 x 3/8
Grommet
Screw
Nut, 1/4 Hex
Washer, Slotted
Stud
Well, Bin Thermostat
Clip, Panel
Pull, Door
Panel, Exterior
Connector, Hose
Scoop
Screw, #10-32 x 3/,3
Plastic, Washer
Trim, Front Panel
Trim, Front Panel
Thumbscrew, #10-1/2
Well Nut
Trim, Door (lower)
Insulation, Door
Screw
Support, Front Panel
Thumbscrew
Grille, Front Panel
Filler Panel
Panel Inner
Panel, Exterior
Screw
Insert, Handle
5-2
Model 506 (UC Ice Maker)
Parts Lists & Exploded Views
MODEL 506 CABINET, DOOR & LINER (Prior to Serial #1181341)
5-3
#3752200 - Revision B - May, 2006
Parts Lists & Exploded Views Model 506 (UC Ice Maker)
MODEL 506 EVAPORATOR, CUTTER GRID & WATER SYSTEM PARTS LIST
(Prior to Serial #1181341)
Ref #
Part #
1.
2.
3.
4.
5.
7.
10.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
27.
28.
29.
30.
31.
33.
38.
39.
40.
41.
42.
43.
44.
45.
46.
757433
585856
758597
585813
758028
681245
756564
758737
585853
681365
593369
596037
681688
598277
587639
564064
487836
841707
978047
1112556
N/A
278744
278745
681611
759021
533238
588048
588109
593171
681534
756659
681534
759043
4200970
#3752200 - Revision B - May, 2006
Description
Water Valve, Complete
Tube, Plastic
Plug
Dispenser, Water
Evaporator
Washer
Mounting Bracket, Grid
Spacer
Shelf, Water Pan
Nut, Cap
Hose, Over flow
Screw, 10-32 x 1/2"
Screw, 1/4-20 x 1-3/4
Insulator
Plug, Grid
Clamp
Nut, Hex
Insert
Nut & Sleeve Assy
Tube, Plastic
Frame, Grid (not a serviceable part)
Pin
Pin
Thumbscrew
Clip, Tension
Adapter
Wire, Grid Cutter
Wire, Grid Cutter
Panel, Grid
Thumbscrew, 10-42 x 5/8"
Pan
Thumbscrew, 10 x 1/2"
Stopper, Water Pan
Complete Grid Assy.
5-4
Model 506 (UC Ice Maker)
Parts Lists & Exploded Views
MODEL 506 EVAPORATOR, CUTTER GRID & WATER SYSTEM PARTS LIST
(Prior to Serial #1181341)
5-5
#3752200 - Revision B - May, 2006
Parts Lists & Exploded Views Model 506 (UC Ice Maker)
MODEL 506 ESCUTCHEON & CONTROL COMPONENTS WITH PARTS LIST
(Prior to Serial #1181341)
Ref #
Part #
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
758903
758414
756664
593139
756341
965173
486579
488437
759000
681245
598235
4318268
Description
Decal, Escutcheon
Transformer
Escutcheon, Panel
Switch, Service
Bracket, Control
Screw, 8-15 x 3/8”
Screw, 8-42 x 1/4”
Screw
Escutcheon
Washer
Thermostat, Evaporator
Thermostat, Bin Control
#3752200 - Revision B - May, 2006
5-6
Ref #
Part #
13.
14.
15.
19.
20.
21.
22.
23.
24.
25.
758489
758488
758490
758567
756880
759123
487246
1118894
593736
676304
Description
Lamp Shield
Light Harness
Lamp Bracket
Grid Harness
Knob
Latch
Screw, 8-42 x 1/2”
Switch
Escutcheon Cup
Bulb
Model 506 (UC Ice Maker)
Parts Lists & Exploded Views
MODEL 506 WATER PUMP COMPONENTS WITH PARTS LIST
(Prior to Serial #1181341)
Ref #
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
Part #
569434
756124
681391
583155
587096
588572
593060
756122
596016
593229
681390
756782
569607
569513
681301
Description
Pump Lead / Plug
Plug Cover
Screw
Motor Housing
Fan Blade
Pump Motor
Washer
Pump Bracket
Grommet
Sleeve
Screw, 8-42 x 3/8”
Complete Water Pump
Pump Housing
Impeller
Retainer Ring
5-7
#3752200 - Revision B - May, 2006
Parts Lists & Exploded Views Model 506 (UC Ice Maker)
MODEL 506 UNIT AREA COMPONENTS PARTS LIST
(Prior to Serial #1181341)
Ref #
Part #
1.
3.
4.
5.
6.
7.
8.
9.
10.
11.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
29.
30.
31.
32.
33.
34.
35.
36.
757955
978655
978483
755339
680198
4387474
680233
486645
482739
553583
938384
564234
588205
598086
819100
3110140
549086
3110170
549336
549342
3014230
756299
241428
587971
758811
488661
2180938
583663
681650
488868
1108115
819100
756298
#3752200 - Revision B - May, 2006
Description
Shroud
Blade, Fan
Motor, Fan
Bracket
Screw, 1/4-20 x 1/2 (5)
Compressor
Screw
Washer
Sleeve
Grommet
Clamp
Clamp, Coil Retainer
Coil, Solenoid
Valve Body
Overload / Relay
Overload (For Service Comp AE3414A)
Spring
Relay (For Service Comp AE3414A)
Case
Strap, Bale
Filter-Drier, High Side
Condenser
Screw
Harness, Coil
Front Deflector
Screw
Unit Base
Plug, Fan Motor
Conical Washer
Screw, 8-46 x 1/2
Cover, Terminal
Overload / Relay
Accumulator
5-8
Model 506 (UC Ice Maker)
Parts Lists & Exploded Views
MODEL 506 UNIT AREA COMPONENTS WITH PARTS LIST
(Prior to Serial #1181341)
7
↑ Original Compressor
Components
Possible Service Compressor
Components →
5-9
#3752200 - Revision B - May, 2006
Parts Lists & Exploded Views Model 506 (UC Ice Maker)
506 CABINET, LINER & DOOR PARTS LIST (Starting with Serial #1181341)
Ref #
1
2
3
4
5
6
7
Part #
9
10
11
12
2175636
2175619
756330
758655
593192
593104
755675
755676
593184
593185
681459
758492
759213
756350
13
14
15
16
17
18
19
21
22
23
24
25
26
28
29
30
32
34
35
36
37
38
39
42
44
47
48
49
51
52
53
2172898
596023
758921
487909
596807
756891
681542
758220
593183
596812
758902
758888
758889
593577
585158
680811
2174781
680930
596715
758713
758754
681196
681419
681613
758716
758769
758770
758771
755677
2175604
489482
8
Description
Ref #
Shell
Front, Shell
Door, Inner Bin
Liner, Door
Plug, Hinge
Strip, Tapping (2)
Trim, Door (Right Side)
Trim, Door (Left Side)
Rail, Door (Right Side)
Rail, Door (Left Side)
Screw, 8-32 x 5/8 (6)
Washer (2)
Tube, Water Fill
Liner (Includes No's. 10,
11, 17, 19, 21, & 35)
Gasket, Bottom
Clamp (2)
Gasket
Screw #8 x 1/2
Grommet
Insulation, Bottom, Foam
Nut
Stud (2)
Well, Bin Thermostat
Clip, Panel (12)
Pull, Door
Panel, Exterior
Panel, Outer
connector, Hose
Scoop
Screw, 10-32 x 3/8
Harness, Cabinet
Thumbscrew, #10-1/2
Well Nut (3)
Trim, Side (2)
Insulation, Door
Screw
Thumbscrew
Washer
Trim, Top and Bottom
Grill, Front
Panel, Filler
Panel, Inner
Trim, Door (Lower)
Support, Front
Retainer, Wire
FOLLOWING PARTS NOT ILLUSTRATED ;
OPTIONAL PARTS NOT INCLUDED
#3752200 - Revision B - May, 2006
Part #
503695
797403
505587
212643
479976
978025
978026
978027
978028
978029
978030
5-10
Description
Sealer, Cork (1/4 Pound)
Cement, Insulation (1 Oz.)
Sealer, Mastic (1 Qt.)
Sealer, Gum
(22 Pcs. 3/16" x 7")
Kit, Insulation
(5 Pcs. 3" x 24" x 48")
Valve, Access (1/4")
Valve, Access (5/16")
Valve, Access (3/8")
Valve, Access (1/2")
Valve, Access (5/8")
Valve, Access (3/4")
Model 506 (UC Ice Maker)
Parts Lists & Exploded Views
MODEL 506 CABINET, DOOR & LINER (Starting with Serial #1181341)
5-11
#3752200 - Revision B - May, 2006
Parts Lists & Exploded Views Model 506 (UC Ice Maker)
MODEL 506 EVAPORATOR, CUTTER GRID & WATER SYSTEM PARTS LIST
(Starting with Serial #1181341)
Ref #
Part #
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
12.
13.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
37.
38.
39.
41.
42.
43.
44.
45.
759296
585856
758597
1129798
2181203
2174726
2174724
759213
489049
756564
489443
585853
759109
596037
2174725
2174727
2174750
587662
681676
841707
627018
758488
758490
681611
745362
2174752
758489
681245
2165477
4200970
593171
681534
756659
681419
759043
#3752200 - Revision B - May, 2006
Description
Water Valve, Complete
Tube, Plastic
Plug (2)
Dispenser, Water
Evaporator
Spacer, Adjustable (Side)
Spacer, Adjustable (Front)
Tube, Water Fill
Screw 10-12 x 1/2
Mounting Bracket, Grid (2)
Screw
Shelf, Water Pan
Hose, Overflow
Screw, 10-32 x 1/2"
Spacer, Fixed (Rear)
Spacer, Fixed (Side)
Harness, Grid
Clamp
Nut, Wing
Insert
Nut & Sleeve Assembly
Harness, Light
Bracket, Lamp
Thumbscrew
Bulb
Grid Assembly (Complete)
Shield, Light
Washer
Adapter
Wire, Grid Cutter
Panel, Grid
Thumbscrew, 10-32 x 5/8"
Pan
Thumbscrew, 10 x 1/2"
Stopper, Water Pan
5-12
Model 506 (UC Ice Maker)
Parts Lists & Exploded Views
MODEL 506 EVAPORATOR, CUTTER GRID & WATER SYSTEM PARTS LIST
(Starting with Serial #1181341)
5-13
#3752200 - Revision B - May, 2006
Parts Lists & Exploded Views Model 506 (UC Ice Maker)
MODEL 506 ESCUTCHEON & CONTROL COMPONENTS WITH PARTS LIST
(Starting with Serial #1181341)
Ref #
Part #
2.
3.
4.
5.
7.
9.
11.
12.
2165483
2165530
2181045
2172846
595005
759000
759308
759309
Description
Ref #
Transformer
Enclosure, Rear
Switch, Service
Bracket, Control
Screw, 8-32 x 1/4”
Escutcheon
Thermostat, Evaporator
Thermostat, Bin Control
#3752200 - Revision B - May, 2006
13.
14.
15.
19.
20.
21.
22.
24.
5-14
Part #
681245
487909
681036
758567
756880
759123
680964
593736
Description
Washer
Screw, #* x 1/2”
Screw
Grid Harness
Knob
Latch
Screw, 8-32 x 1/2”
Escutcheon Cup
Model 506 (UC Ice Maker)
Parts Lists & Exploded Views
MODEL 506 WATER PUMP COMPONENTS WITH PARTS LIST
(Starting with Serial #1181341)
Ref #
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
Part #
756124
681391
583155
587096
588572
593060
756122
596016
593229
681390
756782
569607
569513
681301
Description
Plug Cover
Screw, #8-18 x 3/4”
Motor Housing
Fan Blade
Pump Motor
Washer
Pump Bracket
Grommet (2)
Sleeve
Screw, 8-32 x 3/8”
Complete Water Pump
Pump Housing
Impeller
Retainer Ring
5-15
#3752200 - Revision B - May, 2006
Parts Lists & Exploded Views Model 506 (UC Ice Maker)
MODEL 506 UNIT AREA COMPONENTS PARTS LIST
(Starting with Serial #1181341)
Ref #
Part #
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
14.
15.
16.
17.
18.
20.
21.
23.
24.
25.
27.
29.
30.
32.
33.
34.
2180948
680811
572728
1108089
560817
681305
4387773
680233
595230
585564
596355
489472
759112
759113
2154109
4387766
4387766
2162358
4387019
2180808
2180807
758811
681167
2180938
681650
489199
3111270
#3752200 - Revision B - May, 2006
Description
Shroud
Screw
Blade, Fan
Motor, Fan
Bracket
Screw, 1/4-20 x 1/2" (6)
Compressor (FGS60)
Screw (4)
Washer (4)
Sleeve (4)
Grommet (4)
Screw
Coil, Solenoid
Valve, Body
Tube, Process
Overload/Relay Assembly
Overload/Relay Assembly
Cover, Terminal
Drier
Condenser
Accumulator
Deflector, Front
Screw, 8 x 3/8
Base, Unit
Conical Washer
1/4-20 Hex Screw
Capacitor (Not Shown)
5-16
Model 506 (UC Ice Maker)
Parts Lists & Exploded Views
MODEL 506 UNIT AREA COMPONENTS WITH PARTS LIST
(Starting w/ Serial #1181341)
5-17
#3752200 - Revision B - May, 2006
Parts Lists & Exploded Views Model 506 (UC Ice Maker)
MODEL 506 CONDENSATE DRAIN PUMP COMPONENTS WITH PARTS LIST
ALL MODELS
Ref #
Part #
1.
4165594
2.
3.
4.
5.
6.
7.
8.
9.
300096
770966
758915
596807
488568
681254
596572
758918
Description
Service Sump Pump
(Warrant Replacement Only)
Air Gap
Hose, 7/8” I.D. x 20”
Hose, 3/8” I.D. x 14-3/8”
Grommet
Screw, S.M. #8-15 x 3/4”
Washer
Hose Clamp
Connector, Hose
#3752200 - Revision B - May, 2006
Ref #
Part #
10.
11.
12.
65349
758919
4165594
Description
Hose Clamp
Bushing, Cord
Service Sump Pump
(Warrant Replacement Only)
FOLLOWING PARTS NOT SUPPLIED WITH PUMP
13.
14.
15.
5-18
598894
596023
759019
Hose Connector
Hose Clamp
Overflow Hose
Model 506 (UC Ice Maker)
Troubleshooting Guide
SECTION 6
TROUBLESHOOTING
GUIDE
6-1
#3752200 - Revision B - May, 2006
Troubleshooting Guide
Model 506(UC Ice Maker)
TROUBLESHOOTING GUIDE
This section of the manual contains the Troubleshooting Guide which will help the Service Technician troubleshoot a
model 506 undercounter icemaker .
How to Use the Troubleshooting Guide
The list below indicates how the Troubleshooting Guide is arranged. Identify the description of the problem that the
unit is experiencing from the list and go to the page indicated. To the left of the problem description is a letter.
Locate that letter in the left column of the Troubleshooting Guide. The center column will identify the possible causes for the problem. And, the information in the right column will explain what tests to perform in order to determine if
what you are checking is the cause and/or what action to take to correct the problem.
3
Troubleshooting Guide Layout
Page #
A. Compressor won’t run; No ice in bin. ................................................................................................................
B. Compressor runs; No ice in bin. ........................................................................................................................
C. Compressor runs continuously; bin full of ice. ..................................................................................................
D. Low ice yield ......................................................................................................................................................
E. Excessive water dripping on ice cubes. ........................................................................................................................
F. Mineral deposit on evaporator. ..........................................................................................................................
G. Ice cubes to thin.................................................................................................................................................
H. Ice cubes too thick. ............................................................................................................................................
I. Condenser fan won’t run during icemaking cycle. ............................................................................................
J. Water pump won’t run. ......................................................................................................................................
K. Water tank empty ..............................................................................................................................................
L. Milky ice cubes...................................................................................................................................................
M. Taste in ice. ........................................................................................................................................................
N. Uneven build-up of frost on evaporator plate. ..................................................................................................
O. Unit not making ice, compressor running and water flow over evaporator. ......................................................
P. Ice slab not releasing from evaporator plate during HARVEST cycle. ..............................................................
Q. Ice slab with hollow area in center.....................................................................................................................
R. Ice slab with a lip over the front of evaporator freezing plate............................................................................
S. Ice slab has side flanges. ..................................................................................................................................
T. Ice ball forming on capillary tube at evaporator inlet. ........................................................................................
U. Frost between outlet of evaporator and accumulator ........................................................................................
V. Sweating or frost on suction line........................................................................................................................
System / Compressor Evaluation ............................................................................................................................
#3752200 - Revision B - May, 2006
6-2
6-3
6-3
6-3
6-3
6-3
6-3
6-3
6-4
6-4
6-4
6-4
6-4
6-4
6-4
6-5
6-5
6-5
6-5
6-5
6-5
6-6
6-6
6-6
Troubleshooting Guide
Model 506 (UC Ice Maker)
PROBLEM
A. Compressor won't run; No
ice in bin.
B. Compressor runs; No Ice
in bin.
POSSIBLE CAUSE
TEST / ACTION
1.
2.
3.
4.
5.
6.
7.
8.
Unit located in cold area.
Power disconnected.
Broken wire or loose connection.
Defective compressor start relay.
Service switch in "off" position.
Bin thermostat contacts open.
Defective compressor motor.
Master Switch in "Clean" position
1.
2.
3.
4.
5.
6.
7.
8.
Move to warmer area (above 55° F.)
Connect water.
Locate and repair.
Replace relay.
Move switch to "on" position
Replace bin thermostat.
Replace compressor.
Move switch to "ON" position
1.
2.
3.
4.
5.
6.
7.
8.
9.
Water supply shut off.
Inoperative water valve.
Evap thermostat out of calibration.
Hot gas solenoid stuck.
Inoperative refrigeration system.
Excess use of ice cubes.
Cutter grid circuit open.
Incorrect wiring.
Inlet tube from valve not in water pan.
1. Restore water supply.
2. Check valve parts for restriction; binding or
solenoid coil failure.
3. Recalibrate or replace.
4. Repair or replace solenoid
5. Repair sealed system.
6. Advise customer.
7. Check fuse and other parts of circuit.
8. Check against wiring diagram
9. Insert tube in water pump pan.
C. Compressor runs
continuously; bin full of
ice.
1. Bin thermostat out of calibration
2. Bin thermostat contacts stuck shut.
3. Incorrect wiring.
1. Recalibrate or replace.
2. Replace thermostat.
3. See Number 8 above.
D. Low ice yield.
1. Located in cold areas.
2 . Water falling on ice cubes.
3. Bin thermostat out of calibration.
4. Evaporator thermostat set to produce too
thin or too thick ice cubes.
5. Hot gas solenoid stuck partially open.
6. Insufficient refrigeration.
7. Not enough water being circulated over
evaporator plate.
1. Move to warmer area above 55°F (for best
results 70°F to 90°F)
2. Check water system components for proper
placement.
3. Recalibrate or replace.
4. Move adjusting knob to setting to produce
1/2” x 5/8” cube.
5. Repair or replace solenoid
6. Check and repair sealed system.
7. Check for restriction in water lines. Check
water pump and motor.
E. Excessive water dripping
on ice cubes.
1. Water pan overflowing.
2. Water pump pan out of position.
3. Water inlet tube from water valve not
inserted in water pan.
4. Ice jam on cutter grid causing water to
"bridge" and drip in bin.
5. Water deflector out of position (not
factory installed).
1. Check overflow tube for restrictions.
Overflow hose not inserted in bin drain.
Incorrect / worn flow washer in water valve.
2. Install correctly.
3. Locate tube properly-see pictorial drawing of
water system.
4. Check cutter grid circuit. Check for mineral
deposit on evaporator plate (see Category 6
below).
5. Install properly-Kit #702354.
F. Mineral deposit on
evaporator.
1. High mineral contents in water.
1. See cleaning instructions
G. Ice cubes too thin
1. Evap thermostat set for thin cubes.
2. Not enough water being circulated over
evaporator.
3. Evap thermostat out of calibration.
1. Turn ice thickness control knob clockwise
until cube of desired thickness is obtained.
2. Check for restriction in water lines - check
water pump motor and distributor tube.
3. Recalibrate or replace..
6-3
#3752200 - Revision B - May, 2006
Troubleshooting Guide
PROBLEM
Model 506(UC Ice Maker)
POSSIBLE CAUSE
TEST / ACTION
H. Ice cubes too thick.
1. Evaporator thermostat set at or beyond 1. Turn ice thickness control knob counter-clock
maximum thickness.
wise until desired thickness is obtained.
2. Evaporator thermostat out of calibration. 2. Recalibrate or replace.
3. In cases due to refrigerant overcharge,
3. Remove liquid refrigerant from system; evacliquid refrigerant will "spill over" and run
uate and recharge as shown on model/ serial
results in longer compressor run and
plate.
thicker than normal cubes.
I. Condenser fan won't run
during icemaking cycle.
1.
2.
3.
4.
Fan blade binding on shroud.
Defective motor.
Open circuit in wiring.
Defective evaporator thermostat.
1. Adjust shroud to clear fan blade.
2. Replace motor.
3. Locate and repair (see wiring diagram).
4. Replace thermostat.
J. Water pump won't run.
1.
2.
3.
4.
Pump binding in housing.
Open circuit in wiring.
Defective motor.
Defective evaporator thermostat.
1.
2.
3.
4.
K. Water tank empty.
1. On initial start (after installation) water
will not run to tank until first
“release/defrost” cycle is initiated by
evap thermostat.
2. Open circuit to water solenoid.
3. Complete water line restriction.
4. Defective evaporator thermostat.
5. Water valve stuck shut.
6. Burnt or open solenoid coil.
7. Water inlet tube from water valve not
directing water to tank.
8. Water inlet screen plugged.
1. This is normal. Wait first release cycle.
2. Locate and repair (see wiring diagram)
3. Check shut-off valve or water line restrictions.
4. Replace.
5. Repair or replace valve.
6. Replace coil.
7. Position outlet end of tube into water pump
pan (see pictorial of water system).
8. Remove screen & clean.
L. Milky ice cubes.
1. Water hardness in excess of 15 grains
(also see Category 6).
2. Insufficient water supply in water tank.
1. Advise customer that water softener may be
required (see #1 in Problem “M” below).
2a. See Problem K. above.
2b. Machine defrosting in less than one minute
does not allow time for water to enter and
overflow. Use flow washer Part #588930.
M. Taste in ice
1. High mineral content in water supply.
2. Foods being stored in ice bin.
3. Unit Packaging materials not removed.
1. Consult water treatment expert for advice.
2. Advise customer to refrain from storing foods,
etc. in ice in.
3. Remove all packaging material.
N. Uneven build-up of frost on 1. Water valve restricted.
evaporator plate
2. Little or no water in water reservoir pan.
3. Drain plug not in place on bottom of
water reservoir pan.
4. The water level is over the top of the
drain tube in reservoir pan at beginning
of ICEMAKING cycle.
5. The water restrictor or the holes in the
distributor are plugged.
6. The water pump is not operating.
#3752200 - Revision B - May, 2006
6-4
1.
2.
3.
4.
Remove cause of bind.
Locate and repair (see wiring diagram).
Replace motor.
Replace thermostat.
Repair or replace valve.
See Problem “K” above.
Install drain plug.
Check water system components for proper
placement.
5. Clean or replace distributor tube. Clean or
replace water restrictor.
6. See problem “J” above.
Troubleshooting Guide
Model 506 (UC Ice Maker)
PROBLEM
POSSIBLE CAUSE
TEST / ACTION
O. Unit not making ice, compressor running, and water
flow over evaporator
1. Evaporator freezing plate not getting
cold.
2. Hot gas solenoid not operating properly.
P. Ice slab not releasing from
evaporator plate during
HARVEST cycle.
1. Hot gas solenoid not operating properly. 1. Repair or replace solenoid.
2. Evaporator plate is damaged or covered 2. Clean or replace evaporator plate.
in mineral build-up.
3. Repair or replace FSP condensate pump.
3. The FSP condensate pump, if installed,
is not operating properly.
Q. Ice slab with a hollow area
in the center.
1. The water valve is stuck open.
2. Hot gas solenoid is leaking.
3. Sealed system is undercharged or partially restricted.
R. Ice slab with a lip over the 1. The capillary tube soldered underneath
front of evaporator freezing
front edge of evaporator plate has
broken loose.
plate.
1. Hot gas solenoid has a small leak.
S. Ice slab has side flanges.
1. Repair sealed system.
2. Repair or replace solenoid.
1. Check valve parts for restriction; binding or
solenoid coil failure.
2. Repair or replace solenoid.
3. Repair sealed system.
1. Repair capillary tube.
1. Repair or replace solenoid.
T. Ice ball forming on capillary 1. The bin door is cracked open, or door
1. Make sure bin door is closed. Repair or
seal is leaking.
tube at evaporator inlet.
replace door seal.
2. The insulation bag is not in place, block- 2. Properly position insulation bag.
ing the passage of warm air from the unit
compartment into the evaporator area.
U. Frost between outlet of
evaporator and accumulator.
1. Ice thickness control set too high, too
thick of ice slab is forming.
2. Overcharge of refrigerant in sealed
system.
1. Turn ice thickness control knob counter-clock
wise until desired thickness is obtained.
2. See Serial plate for recommended amount of
refrigerant charge.
V. Sweating or frost on suction line.
1. Accumulator not level (horizontal).
2. Overcharge of refrigerant in sealed
system.
1. Position accumulator correctly.
2. See Serial plate for recommended amount of
refrigerant charge.
SYSTEM / COMPRESSOR EVALUATION
Suction Pressure Head Pressure
Basic Cause
High
Low
Low Capacity Compressor
High
High
Excessive load on evaporator (water siphoning/ solenoid leaking)
Normal
Low
Ambient too low (below 55 degrees)
Normal
High
Air in system. Slow condenser fan. Dirty condenser. Overcharged.
Low
Normal
Low
Low
Short charge. Poor quality ice slab and/or hollow slab.
Short charge. Long defrost
6-5
#3752200 - Revision B - May, 2006
Troubleshooting Guide
#3752200 - Revision B - May, 2006
Model 506(UC Ice Maker)
6-6
Technical Data
Model 506 (UC Ice Maker)
SECTION 7
TECHNICAL DATA
7-1
#3752200 - Revision B - May, 2006
Technical Data
Model 506 (UC Ice Maker)
Model 506 Undercounter Icemaker
(Prior to Serial # 1181341)
Water Solenoid Valve - .25 GPM Flow Washer - 80 Mesh Inlet Screen
Water Pump Motor - 39 Watts, .75 Amps, 3350 RPS - Internal Overload
(Water distributor uses restricted inlet to obtain proper pump capacity)
Compressor Overload - Current and Ambient Sensitive
Compressor Relay - Current (magnetic) Type with N/O Start Contact
Condenser - Forced Air - Copper & Aluminum
Evaporator - Stainless Steel
Refrigerant Charge (R -12) - See Serial Plate
Drier - Molecular Sleeve - High Side
Running Amps - 3.5 (average)
Bin Storage Capacity - 35 Lbs. Maximum
Ice Production Capacity - See Ice Production Chart Below
THERMOSTAT
Ice Thickness (Evaporator)
Warm Position →
CUT-IN
CUT- OUT
38°F " 2°F
38°F " 2°F
41 °F " 1.5°F
Bin Shut -off
10.5°F " 4°F
-3°F " 2.5°F
35°F " 1.5
ALTITUDE CORRECTION
Adjust range screw
according to chart on unit
thermostat bracket
IMPORTANT NOTE: When changing an evaporator thermostat, make sure that at least 8" of capillary tube
is “S“ shaped and laying tight against the bracket soldered to the bottom of the evaporator. Tape at least 1"
of capillary tube to the hot gas line at the front edge of the evaporator. This shortens the defrost time.
Ambient Temperature
ICE PRODUCTION (Lbs.) IN 24 HOURS
NOTE: Maximum ice production will only be obtained under ideal
conditions. Production capacities shown in the above graph are
average and variances are normal.
100°F
35
34
33
32
90°F
42
40
38
36
80°F
44
41
39
34
70°F
46
42
39
35
50°F
60°F
70°F
80°F
Additional factors which reduce the production capacity are:
1. Making cubes thicker than 1/2”.
2. Increased ice meltage in storage bin due to high ambient
temperatures (25% is average).
To maintain production capacity, avoid locating icemaker in
greasy or dusty atmosphere, or adjacent to high temperature
equipment such as ovens, ranges, steam tables, etc. . .
Water Temperature
PERFORMANCE DATE
Temperature (Fahrenheit)
Suction Pressure
at end of Freeze Cycle
Head pressure
at end of Freeze Cycle
Cycle Time in Minutes
Ambient 70 °/ Water 60 °
4-7
110 - 125
25 - 29
Ambient 90 °/ Water 60 °
5-8
145 - 160
27 - 33
Ambient 100 °/ Water 60 °
6-9
185 - 200
38 - 46
Ambient 70 °/ Water 80 °
4-7
110 - 125
28 - 34
Ambient 90 °/ Water 80 °
5-8
145 - 160
32 - 40
Ambient 100 °/ Water 80 °
6-9
185 - 200
40 - 48
#3752200 - Revision B - May, 2006
7-2
Technical Data
Model 506 (UC Ice Maker)
Model 506 Undercounter Icemaker
(Starting with Serial # 1181341)
Water Solenoid Valve - .25 GPM Flow Washer - 80 Mesh Inlet Screen
Water Pump Motor - 39 Watts, .75 Amps, 3350 RPS - Internal Overload
(Water distributor uses restricted inlet to obtain proper pump capacity)
Compressor Overload - Current and Ambient Sensitive
Compressor Relay - Current (magnetic) Type with N/O Start Contact
Condenser - Forced Air - Copper & Aluminum
Evaporator - Stainless Steel
Refrigerant Charge (R -134a) - See Serial Plate
Drier - Molecular Sleeve - High Side
Running Amps - 3.5 (average)
Bin Storage Capacity - 35 Lbs. Maximum
Ice Production Capacity - See Ice Production Chart Below
THERMOSTAT
Ice Thickness (Evaporator)
Warm Position →
Bin Shut -off
CUT-IN
CUT- OUT
ALTITUDE CORRECTION
38°F " 1.5°F
38°F " 1.5°F
41°F " 1.5°F
10.6 °F " 2.9°F
-4.8°F " 2.7°F
35°F " 1.5
Adjust range screw
according to chart on unit
thermostat bracket
IMPORTANT NOTE: When changing an evaporator thermostat, make sure that at least 8" of capillary tube
is “S“ shaped and laying tight against the bracket soldered to the bottom of the evaporator. Tape at least 1"
of capillary tube to the hot gas line at the front edge of the evaporator. This shortens the defrost time.
Ambient Temperature
ICE PRODUCTION (Lbs.) IN 24 HOURS
100°F
35
34
33
32
90°F
42
40
38
36
80°F
44
41
39
34
70°F
46
42
39
35
50°F
60°F
70°F
80°F
NOTE: Maximum ice production will only be obtained under ideal
conditions. Production capacities shown in the above graph are
average and variances are normal.
Additional factors which reduce the production capacity are:
1. Making cubes thicker than 1/2”.
2. Increased ice meltage in storage bin due to high ambient
temperatures (25% is average).
To maintain production capacity, avoid locating icemaker in
greasy or dusty atmosphere, or adjacent to high temperature
equipment such as ovens, ranges, steam tables, etc. . .
Water Temperature
PERFORMANCE DATE
Temperature (Fahrenheit)
Suction Pressure
at end of Freeze Cycle
Head pressure
at end of Freeze Cycle
Cycle Time in Minutes
Ambient 70 °/ Water 60 °
1-4
65 - 80
18 - 22
Ambient 90 °/ Water 60 °
2-5
85 - 100
21 - 27
Ambient 100 °/ Water 60 °
2-6
85 - 105
28 - 35
Ambient 70 °/ Water 80 °
1-4
65 - 80
20 - 25
Ambient 90 °/ Water 80 °
2-5
85 - 100
23 - 30
Ambient 100 °/ Water 80 °
2-6
85 - 105
30 - 38
7-3
#3752200 - Revision B - May, 2006
Technical Data
Model 506 (UC Ice Maker)
PRODUCT SPECIFICATIONS - MODEL 506 UNDERCOUNTER ICE MAKER
Height
34-13/32”
Width
17-7/8”
Depth
23-7/8”
Shipping Weight
122 Lbs.
Net Weight
114 Lbs.
Average Ice Making Capacity in 24
Hrs.
50 Lbs. - 6600 Cublets
With 70°F Ambient - 60°F Water
Storage Capacity
35 Lbs. - 4620 Cublets
Electrical Requirements
115 Volts AC, 50/60 Hertz
Average Power Consumption
250 - 300 Watts
Compressor
1/5 HP, Piston
Refrigerant Charge
R-12 Prior to Serial #1181341
R-134a Starting with Serial #1181341
Refrigerant Control
Capillary Tube
Solenoid w/Flow Washer,
in Unit Compartment
Water Control
Condenser Fan Blade
5 Prop, Plastic
Condenser Fan Motor
3 Watt Output, 1200 Rpm's
#3752200 - Revision B - May, 2006
7-4
Model 506 (UC Ice Maker)
Wiring Diagrams/Schematics
SECTION 8
WIRING DIAGRAMS
AND SCHEMATICS
8-1
#3752200 - Revision B - May, 2006
Wiring Diagrams/Schematics
Model 506 (UC Ice Maker)
UNIT WIRING DIAGRAM & SCHEMATIC
PRIOR TO 1995 (Prior to Serial #1140060)
115
VOLTS
60 HERTZ
L
2
N
1
OFF
CLEAN
WATER
PUMP
6
ON 3
SERVICE
SWITCH
PLUG
CONDENSER
FAN
RECEPTACLE
HOT
GAS
BIN
THERMOSTAT
1
3
2
N.C.
SOLENOID
N.C.
WATER
VALVE
SOLENOID
SHUNT
EVAPORATOR
THERMOSTAT
PRESSURE
SWITCH
R
CONDENSATE
DRAIN PUMP
S
OVERLOAD
COMPRESSOR
TRANSFORMER
START RELAY
115 V
8.5 V
DOOR SWITCH
CUTTER GRID
Y
BK
TRANS.
INT. LTD.
8.6V 115V
COLOR CHART
R
BK
BU
W
Y
O
RED
BLACK
BLUE
WHITE
YELLOW
ORANGE
3
BIN
THERMO
Y
BK
W
BK
BK
1
EVAP
THERMO
2
2
SERVICE
SWITCH
3
1
6
0
BK
W
GRID
Plug
MOT
BK
BU
PUMP
W
N
BK
DOOR
SWITCH
BK
W
R
BK
BIN
LT.
SOL
N.C.
SOL
N.C.
HOT GAS
WATER
BK
W
MOTOR
BK
START
RELAY
COMPRESSOR
FAN
RECEPTACLE WITH SHUNT
8-2
115V
60 Hz
L 1 Phase
OVER
LOAD
W
BU
#3752200 - Revision B - May, 2006
BK
0
Wiring Diagrams/Schematics
Model 506 (UC Ice Maker)
UNIT WIRING DIAGRAM & SCHEMATIC
BEGINNING 1995 (Starting with Serial #1140060)
COLOR CHART
R
BK
BL
W
Y
OR
BK/W
G/Y
60 HERTZ
N
115 VOLTS
L
RED
BLACK
BLUE
WHITE
YELLOW
ORANGE
BLACK / WHITE TRACER
GREEN / YELLOW TRACER
2
1
WATER PUMP
W
BK
BK
CONDENSER
FAN W
CLEAN
OFF
ON
5
SERVICE
SWITCH
3
Y
OR
6
Connector - Screw
BIN
THERMOSTAT
Connector - Closed End
Disconnect Terminal
1
BK/W
Permanent Connection
2
3
EVAPORATOR
THERMOSTAT
BK/W
Plug Connector
Ground (Chassis)
BL
HOT GAS
SOL N.C.
BK
W
WATER
VALVE N.C.
SOL
R
R
W
W
BK
C
S
OVERLOAD
COMPRESSOR
TRANSFORMER
Y
W
START RELAY
115V
8.5V
DOOR
SWITCH
BIN LIGHT
CUTTER GRID
Y
8.5V 115V
BK
BK/W
3
CONTROL
BRACKET
BK
GRID
W
W
R
1
G/Y
BK
CAB
SHELF
N
BL
BK
6
G
G/Y
PUMP
2
SERVICE
SWITCH
CABINET
G/Y
BK
MOT
DOOR
SWITCH
EVAP
THERMO
PLUG
115V
60HZ
L 1PH
W
W
BK
BK
BIN
THERMO
Y
W
BK
2
OR
TRAN
3
1
BK
BK/W
OVERLOAD
W
W
BIN
LT
W
SOL
N.C.
SOL
N.C.
MOT
HOT GAS
WATER
FAN
OR
START
RELAY
COMPRESSOR
8-3
#3752200 - Revision B - May, 2006
Wiring Diagrams/Schematics
Model 506 (UC Ice Maker)
Linear Strip Circuits
Water Pump ( ICE MAKING Cycle)
N
L
Evaporator
Thermostat
2
2
3
1
1
6
Service
Switch
Bin
Thermostat
Water
Pump
Water Pump ( CLEAN Cycle)
N
L
1
6
Service
Switch
Water
Pump
Condenser Fan
N
L
Evaporator
Thermostat
2
3
Service
Switch
#3752200 - Revision B - May, 2006
2
Bin
Thermostat
1
Condenser
Fan
8-4
Model 506 (UC Ice Maker)
Wiring Diagrams/Schematics
Linear Strip Circuits
Hot Gas Valve Solenoid (Units with gravity
drain or non-FSP pump - Shunt in receptacle)
N
L
Evaporator
Thermostat
2
2
3
Receptacle
NC
Hot Gas
Solenoid
3
Bin
Thermostat
Shunt
Hot Gas Valve Solenoid (Units with FSP condensate drain)
N
L
Evaporator
Thermostat
2
2
3
Receptacle
NC
Hot Gas
Solenoid
3
Bin
Thermostat
Pressure
Switch
FSP
Condensate
Drain Pump
Water Valve Solenoid (Units with gravity drain or non-FSP
sump pump- shunt in receptacle)
N
L
Evaporator
Thermostat
2
2
3
Receptacle
Hot Gas
Solenoid
3
Bin
Thermostat
NC
Shunt
8-5
#3752200 - Revision B - May, 2006
Wiring Diagrams/Schematics
Model 506 (UC Ice Maker)
Linear Strip Circuits
Water Valve Solenoid (Units with FSP condensate drain)
N
L
Evaporator
Thermostat
2
3
2
Receptacle
NC
Water
Valve
Solenoid
3
Bin
Thermostat
Service
Switch
Pressure
Switch
FSP
Condensate
Drain Pump
Compressor (Start)
L
N
2
3
Service
Switch
R
R
S
S
Overload
Bin
Thermostat
Compressor
Start
Relay
Compressor (Run)
L
N
R
2
3
Service
Switch
Overload
Start
Relay
Bin
Thermostat
#3752200 - Revision B - May, 2006
R
Compressor
8-6
Model 506 (UC Ice Maker)
Wiring Diagrams/Schematics
Linear Strip Circuits
L
N
Bin Light
Transformer
115V
3
2
Service
Switch
8.5 V
Bin Light
L
Door
Switch
N
Cutter Grid
Transformer
115V
3
2
Service
Switch
8.5 V
Cutter
Grid
FSP Condensate Pump (HARVEST Cycle)
L
Receptacle
Evaporator
Thermostat
2
2
3
N
3
Bin
Thermostat
Service
Switch
Drain
Pump
FSP
Condensate
Drain Pump
FSP Condensate Pump (at all times except during HARVEST Cycle)
L
Receptacle
N
Pressure
Switch
Drain
Pump
FSP
Condensate
Drain Pump
8-7
#3752200 - Revision B - May, 2006
Wiring Diagrams/Schematics
#3752200 - Revision B - May, 2006
Model 506 (UC Ice Maker)
8-8

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