Scotsman FDE474 Service Manual

Introduction

FDE474

Purpose of this manual: To provide detailed
installation and operation instructions; to give
insights into how the machine works; to list
possible causes for problems; and to suggest
procedures for specific types of service.

The FDE474 is an ice maker and dispenser
combined into one cabinet. The refrigeration
system is air cooled, using R-134a as a refrigerant.
The control system uses electric eyes as a bin
control and a water level sensor as the water
safety control. As ice is made, it fills a plastic
storage bin. When ice is needed, a motor rotates a
stainless steel vane inside the storage bin and
sweeps the ice into the spout.

Table of Contents

Specifications: ·········································· Page 2

To The Installer: ·········································· Page 3

For The Electrician ········································ Page 4

For The Plumber ········································· Page 5

Optional Kits: ··········································· Page 6

Wall Mount Kit (KWB1): ······································ Page 7

Final Check List & Initial Start Up ································· Page 8

User Operation ·········································· Page 9

Component Location & Function ································· Page 10

Component Description: Control Box ······························· Page 11

Electrical Sequence ········································ Page 12

Refrigeration System Operation ································· Page 13

Water System Operation: ····································· Page 14

Mechanical Operation ······································· Page 15

Maintenance: ··········································· Page 16

Auger and Bearing Inspection ·································· Page 17

Inspection: Auger ········································· Page 18

Inspection: ············································ Page 19

Service Diagnosis ········································· Page 20

Service Diagnosis ········································· Page 21

Electrical System ········································· Page 22

Removal and Replacement ···································· Page 23

Water System ··········································· Page 24

Bearings, Water Seal and Auger ································· Page 25

Bearing Replacement: ······································ Page 26

Refrigeration System ······································· Page 27

Gear Reducer Removal ······································ Page 28

Auger Drive Motor ········································ Page 29

March 2000

Page 1

FDE474

Specifications:

Scotsman ice machines, like the FDE474, are
designed to be installed indoors, in a controlled
environment.

Scotsman Ice Systems are designed and
manufactured with the highest regard for safety
and performance. They meet or exceed the
standards of UL, NSF and CUL

The minimum and maximum operating conditions
are:

·

Minimum Air Temperature: 50oF.

·

Maximum Air Temperature: 100oF.

·

Minimum Water Temperature: 40oF.

·

Maximum Water Temperature: 100oF.

·

60 Hz voltage may vary between 104 and 126
volts.

·

Water Pressure may vary between 20 and 80
psi.

Operating the machine outside these conditions
constitutes misuse and voids the warranty.

Model Number Dimensions

W"xD"xH"

FDE474AS-1A 14 x 23
FDE474AS-6A 14 x 23

3

4

3

4

x27
x27

Basic
Electrical

7

115/60/1 12 lb. 470 lb./24Hr 14 oz. 14.6 20

8

7

230/50/1 12 lb. 14 oz. n/a n/a

8

Bin
Capacity

Scotsman assumes no liability or responsibility of
any kind for products manufactured by Scotsman
that have been altered in any way, including the
use of parts and/of other components not
specifically approved by Scotsman.

Scotsman reserves the right to make design
changes and/or improvements at any time.
Specifications and designs are subject to change
without notice.

Ice Making
Capacity

Refrigerant
Charge
(R134a)

Min.
Circuit
Ampacity

Max Fuse
Size

March 2000

Page 2

To The Installer:

FDE474

A professional installation of any product is critical
to the long term satisfaction of the user. The
FDE474 is designed to be installed either on a
counter, or, using a wall hanging kit, hung from a
wall. Another option is a kit to increase the cabinet
height which will allow taller containers to be
placed under the spout. Determine the location
from the anticipated use and any options planned
for.

This machine is air cooled and blows air out the
lower left side of the cabinet. Do not install the
machine where the side to side air flow might be
blocked.

Cooling Air Flow

Warm Air

Exhaust

The machine will require electrical power, water
and a drain. Follow all local codes. Rough in the
utilities before placing the machine into position
(see For The Electrician and For The Plumber).

Water Quality:

The quality of the water supplied to the machine
will directly affect the purity of the ice and the
reliability of the machine. While the condition of the
water supplied to a building is normally out of the
control of the user, water can be treated at the
point of use.

There are two major types of water impurities:
suspended solids (those that are carried along with
the water and may be filtered out) and dissolved
solids (those that are part of the water and have to
be treated). A water filter is always a good idea,
but does require regular maintenance to change
the cartridge. In some water conditions, water
treatment may be required. Generally this means a
polyphosphate feeder of some kind. Water
softeners are not recommended for the FDE474.

General Installation:

Place the machine in its final location. Remove the
top, right and left side panels:

1. Remove two screws at the back of the top panel.

2. Pull up on the back of the top panel and remove
it.

3. Remove screws from the sides (top and bottom)
of the side panels and from the splash panel.

4. Pull the side panels back and off the machine.
Plumbing connections may be made thru holes in

the back of the cabinet or thru the base.

·

Route the sink drain to the back of the cabinet.
Route the bin drain to the back panel.

·

Route the electrical power cord from the
junction box inside the cabinet. thru the back
panel .

·

Route the inlet water line thru the back panel or
base to the flare fitting inside the cabinet.

Install the stainless steel panel kit (if used) now.
Install the back panel of the stainless steel panel

kit now (if used).
After all plumbing and internal wiring has been

done, replace the side and back panels.
Level the unit front to back and left to right.
The machine does not require sealing to the

counter due to the gasket on the base.

March 2000

Page 3

FDE474

For The Electrician

Electrical connections:
Check the nameplate for voltage and current

requirements. An electrical cord is not supplied.
Connect the FDE474 to a separate electrical
circuit. Wiring to the machine must conform to all
codes. A licensed electrician may be required in
some situations.

Remove the back panel to make the electrical
connection. The electrical connection is made on
the terminal strip in the junction box inside the
machine. Replace the back panel when the
electrical connections are complete.

FOLLOW ALL APPLICABLE LOCAL, STATE

AND NATIONAL CODES

This Unit MUST BE GROUNDED

Electrical

Power

Remove Back Panel To

Expose Junction Box

March 2000

Page 4

For The Plumber

Drains:

The dispenser requires a gravity drain. The pitch
on the drain tubes must be at least 1/4 inch fall per
foot of horizontal run. On long horizontal runs, a
vent at the back of the cabinet will improve
draining, and is recommended.

There are two drains to connect: A sink drain, a
plastic tube; and the bin drain, a

5

” plastic tube.

8

Install rigid tubing between the machine and the
building drain. Route the drains separately to the
building drain.

Water supply:

Connect cold, potable water to the machine. A
hand valve near the location is recommended. A
water filter is also a good idea.

Follow all local codes.

7

8

Water Inlet Fitting

FDE474

“

FOLLOW ALL APPLICABLE LOCAL, STATE

AND NATIONAL CODES

(Inside Cabinet)

Water Supply

Strainer or

Filter

Bin and Reservoir

Overflow Drains

Sink Drain

Building Drain

(Typical)

March 2000

Page 5

FDE474

Optional Kits:

Sink Extension (KDE1 enamel or KDE1SS
stainless steel):

1. Remove the standard sink and splash panel
from the cabinet.

2. Remove the glass filler lever and holder.

3. Remove drain tube from standard sink.

4. Install drain tube onto replacement sink.

5. Remove rubber gasket from the base of the
dispenser.

6. Mount the dispenser on the base. The flange of
the dispenser base fits in slots provided in the base
extension. Secure the base extension to the sink
with the 3 screws on the front side panel.

7. Mount the sink in place and secure with two
machine screws.

8. Install splash plate to cabinet with four machine
screws. The splash plate fits over the sink.

9. Install the glass filler lever and holder to the
splash panel.

10. Install grill.

Base Extension

Kit Components

Kit Splash

Panel

Grill

Sink

March 2000

Page 6

Wall Mount Kit (KWB1):

FDE474

Contents:

1. Top Case Hanger Bracket: Attaches to the frame
of the dispenser.

2. Top Wall Bracket: Mounts to the wall and
engages the top case hanger bracket to support
the dispenser.

3. Bottom Wall Bracket: Mounts to the wall and
spaces the base of the dispenser away from the
wall.

4. Bottom Fittings Cover: Fastened to the bottom
wall bracket to hide the utility connections.

Top Wall Bracket:

1. Hold the bracket on the wall where it will be
mounted.

2. Mark on the wall the positions of the holes in the
bracket.

3. If needed, drill pilot holes for the fasteners.

4. Secure the bracket to the wall with fasteners of
sufficient strength to hold up the FDE474.

Bottom Wall Bracket:

1. Lift up and hang the dispenser from the top wall
bracket.

2. Position the bottom wall bracket so that the
molding on the dispenser base bottoms in the
channel of the wall bracket.

3. Secure the bracket to the wall.

Bottom Fitting Cover:

1. Connect electrical power, water inlet, bin drain
and sink drain of the dispenser thru the bottom of
the case.

2. Secure bottom fitting cover to the bottom wall
bracket with the four sheet metal screws provided
in this kit.

Top Panel

Installation: Check building wall for the strength

required to support a machine of the FDE474’s
weight and size. Note that if at least 6" of space is
not left above the machine, cleaning and most
service of the machine will require removal of the
machine from the wall mounts. All utilities are to be
routed thru the base. The back panel is not used
when the machine is hung from the wall.

Top Case Hanger Bracket

1. Remove top panel.

2. Remove back cover and save the 4 screws for
mounting the bracket.

3. Drill out the holes (as marked in the illustration)
in the back of the frame with a 3/16" drill bit.

4. Place top hanger bracket on the inside of the
frame and fasten to the frame with the four
screws removed in step 2.

Enlarge Holes

Top Case

Bracket

Bottom

Cover

Wall

Brackets

Secure With

Screws

March 2000

Page 7

FDE474

Final Check List & Initial Start Up

1. Is the machine located indoors where the
temperature limitations are not exceeded?

2. Is there at least 6" clearance on both sides of
the cabinet for adequate air flow?

3. Is the water supply adequate, and has a shut off
valve been installed?

4. Is the cabinet level?

5. Have all of the electrical and drain connections
been made?

Initial Start Up

1. Remove 2 screws at the back of the top panel
and remove the top panel.

2. Remove screws and the side panels.

3. Open the water supply shut off valve.

4. Watch the water fill the reservoir. Check that it
flows in and fills the reservoir near to the mark
molded into the side of the reservoir. Check that
the float shuts off the water flow when the tank is
full. Check for leaks. Tighten hose clamps as
needed.

5. Plug the unit in or switch on the electrical power.
After a few seconds the machine will start.

6. Let the machine operate, listen for any unusual
noises. If needed, reposition tubing & panels to
eliminate vibration.

After the unit has been operating for about 10
minutes, there should be enough ice in the bin to
test the dispense system.

7. Using a container, push the glass filler lever in
and see that ice is dispensed (the bin drive motor
continues to run as long as the glass filler lever is
pushed in).

8. Move the water switch (rocker switch on the
front panel) to ON. Then use a container to push in
the glass filler lever. Both water and ice should be
dispensed.

9. Pour water into the sink and check that the drain
does not leak but drains the water rapidly.

10. Explain to the user the maintenance
requirements and operation of the machine.

11. Fill out the Warranty Registration and Customer
Evaluation form. Mail it to Scotsman.

12. Leave the service manual with the owner/user
and explain who should be called if service is
needed.

March 2000

Page 8

User Operation

The FDE474 is an automatic ice vending machine.
All it requires is cool air, clean water and an
adequate supply of electrical power.

To Vend Ice:

Push the glass filler lever in and hold it in until the
container is full of ice. Do NOT overfill the
container or a build up of ice in the sink or a back
up of ice in the spout will occur.

To Vend Ice and Water.

Switch the Water Switch to ON. Push in the glass
filler lever; water and ice will be dispensed into the
container below the spout. Note: The water is NOT
cooled, it is the same temperature as the building
supply water.

Daily Maintenance: Pour hot water into the sink to
flush out any debris or build up. Wipe the cabinet
off, wash the sink and grill to keep minerals from
accumulating.

FDE474

Water

Switch

Glass

Filler

Lever

March 2000

Page 9

FDE474

Component Location & Function

Evaporator. This is a vertical cylinder full of water
and refrigerated. Also in the cylinder is a slowly
rotating auger. The auger forces the ice up the
evaporator walls and compresses it at the top. The
resulting flaked ice then falls by gravity into the ice
storage bin.

Water Reservoir. The water reservoir contains the
inlet float valve and the water level sensor. The
float valve controls the flow of water into the
reservoir, and the water level sensor will stop the
ice maker if the water supply fails.

Ice Storage Bin. The ice storage bin is an
insulated plastic container that is open at the top
and has a spout at the bottom. There is a rotating
ice vane inside the bin that causes the ice to be
swept over the spout and dispensed. The vane is
rotated by a gear motor at the top of the bin.

Bin Cover. The bin cover not only keeps dirt from
the ice storage bin, it also is the support for the
dispense gear reducer and the location of the
electric eye bin controls.

Condenser. The FDE474 uses
an air cooled condenser. It blows
air out, away from the fan motor.
The heat removed from the water
is exhausted from the condenser.

Compressor. The refrigeration
system compressor provides the
force to move the refrigerant
around the system.

Auger Drive. The auger drive is
a direct drive gear reducer.

Glass Filler Lever. When
pushed in, it moves a microswitch
which causes the dispense gear
reducer to rotate the vane and
dispense the ice.

Compressor

Auger Drive

Water Reservoir

Evaporator

Bin Cover

Condenser

Ice Storage

Bin

Glass Filler Lever

March 2000

Page 10

Component Description: Control Box

Circuit Board: Controlling the ice machine
through sensors and relays. The sensors are for
ice level and water level. The relays are for the
gear motor (with a built in time delay to clear the
evaporator of ice when the unit turns off) and for
the compressor.

Water OK Light

FDE474

Control Board

Power OK Light

Service Light

Freeze Light

Bin Full

Light

LED1

Compressor

Relay

LED3

Auger

Relay

March 2000

Page 11

FDE474

Electrical Sequence

There are 7 indicator lights on the control board:

WTR-OK. Water OK. Normal = Glowing. Glows

·

when there is water in the reservoir.

PWR-OK. Power OK. Normal = Glowing. Glows

·

when the control board has power and is
functional.

Service. Normally Off.

·

Freeze. Normally Glowing when making ice.

·

Bin Full. Normally Off when making ice.

·

LED1. Normally Glowing when making ice.

·

LED3. Normally Glowing when making ice.

·

Connecting power to the machine does the
following:

The PWR-OK light glows.

·

If there is water in the reservoir the WTR-OK

·

light glows.

After 10 seconds the Freeze, LED1 and LED3

·

lights glow and the machine starts up.

Start Up:

The compressor relay and auger motor relay

·

become energized, connecting power to the
windings of the auger motor and contactor coil.

·

The contactor is energized, connecting power to
the compressor, and the compressor starts.

·

During normal operation ice passes between
the ice level sensors but only interrupts their
infrared beam momentarily. The bin full light
remains off and the machine stays on until ice
builds up in the bin and blocks the path between
the sensors for 6 seconds or longer. When that
occurs the bin full light glows and the machine
shuts down.

Ice Vending

When the glass filler lever is pushed in the vend
switch closes, connecting power to the vend drive
motor.

Shut Down:

The board’s compressor relay opens, LED1

·

goes out.

The external compressor relay opens

·

The compressor stops

·

The auger motor stays on for 1 more minute,

·

clearing out ice in the evaporator, and then

The auger motor relay opens, LED3 goes out

·

and the auger motor stops.

The compressor will not restart until 2 minutes or
more have passed after the last shut down.

If the path between the ice level sensors remains
clear for more than 10 seconds the ice machine
will restart.

Another purpose of the control board is to turn the
machine off when necessary:

When the water level in the reservoir falls below

·

the water level sensor’s tip, the WTR-OK light
goes out and the machine shuts down. When
water refills the reservoir the WTR-OK light
glows and the machine starts up again.

If the auger drive motor current becomes

·

excessive the compressor and auger drive
motor will be switched Off and the Service light
will blink. The control board will restart the auger
drive motor in 4 minutes. If during the first 60
seconds after restart the auger motor current
stays within limits, the compressor is restarted
and the machine returns to normal operation. If
the current is excessive within 60 seconds after
the restart, the process will be repeated once
more. If after that try the current is still
excessive the machine shuts down and must be
manually reset. The service light will then be
glowing continuously.

To Reset: Disconnect and reconnect electrical
power

March 2000

Page 12

Refrigeration System Operation

FDE474

The FDE474 uses a forced draft condenser,
capillary tube and hermetic compressor. The
system uses R-134a as a refrigerant. High
pressure, high temperature refrigerant is forced
thru the condenser where it discharges enough
heat to condense. The high pressure liquid
refrigerant then passes thru the capillary tube
which causes a pressure drop in the evaporator.
As the high pressure liquid refrigerant moves into
the evaporator’s area of low pressure, the warm
water and low pressure cause the refrigerant to
evaporate and absorb heat from the metal walls of
the evaporator. After the refrigerant has flowed thru
the evaporator it goes back to the compressor thru
the suction line as a low pressure vapor. At the
compressor the cycle is repeated.

The FDE474 uses a low side pressure control as a
safety, it will shut the system down if the suction
pressure is too low for reliable operation.

Evaporator

System Characteristics:

Typical Low Side Pressure:

·

13 - 14 PSIG

Typical Discharge Side Pressure:

·

135 - 175 PSIG

System Refrigerant Charge:

·

14 ounces of R-134a

Compressor

Refrigeration System Schematic

Capillary Tube

Dryer

Air Cooled

Condenser

March 2000

Page 13

FDE474

Water System Operation:

The water system consists of a float valve,
reservoir and water dispense solenoid valve. The
water level in the reservoir tank is the same level
as that inside the evaporator. Building water supply
flows to both the float valve and the solenoid. The
float valve will open to add water to the reservoir
as water flows out to the evaporator. The solenoid
will only open if the water switch is closed and the
dispense lever is pushed.

Evaporator

Electric Eyes

Ice

Dispensing

Vane

Inside the evaporator there is a water seal. This
seal is the type that has a rotating half and a
stationary half. The area where the two seals touch
are smooth flat surfaces. When the auger is
installed in the evaporator, it forces the rotating half
of the seal against the stationary half. The
stationary half is spring-loaded and provides a firm
pressure against the auger portion of the seal.

Water Level

Sensor

Float Valve

Water Seal

Inner Bin

Bottom

Water and Ice

Dispensing Spout

Water Dispensing

Solenoid Valve

Sink

Bin and

Reservoir

Overflow

Drain

Water Inlet

Connection

Water System Schematic

March 2000

Page 14

Sink Drain

Mechanical Operation

FDE474

General:

The FDE474 makes, stores and dispenses ice. It
also dispenses water. The ice making portion of
the machine produces flaked ice at about 32
The ice falls thru a chute into the dispensing bin.
Above the cylindrical bin is a dispense drive motor
and electric eyes. The drive motor is connected to
an ice vane in the bin. When the user pushes in
the glass filler lever, the dispense drive motor
rotates the vane and the ice. There is a slot in the
base of the bin, located just above the vend spout
and glass filler lever. When the ice moves over that
slot, some of the ice on the bottom of the bin falls
thru the slot, into the chute and fills the container.

ON/OFF Control:

Flaked ice is produced by the ice maker until ice
builds up between the electric eyes. When the
electric eyes can no longer “see” each other, they
send a signal to the control board to shut the
machine off. The refrigeration compressor stops
but the auger drive motor will continue to operate
for about 2 minutes to clear the evaporator of ice.

Water Control:

Because water is such an important requirement
for making ice, a water level sensor has been
placed in the reservoir. If the water supply to the
machine should fail, the water level sensor will
send a signal to the control board to shut down the
machine.

Refrigeration:

The refrigeration system uses a hermetic
compressor (specifically designed for R-134a),
forced draft air cooled condenser, capillary tube
and vertical flaked ice evaporator. Inside the
evaporator is a slowly rotating auger. The auger is
supported by bearings at each end, and there is a
face-type water seal above the bottom bearing.
The auger is driven by a 1/10 HP direct drive gear
reducer. The auger drive motor has a speed
operated switch on it that will keep the compressor
from operating if the auger motor is not turning at
full speed.

o

F.

Water System

Water flows from the building supply to the
reservoir and to the electric solenoid valve. Water
from the reservoir is used to make ice. Water the
flows thru the solenoid is dispensed.

The bin, sink and reservoir overflow all have
drains.

March 2000

Page 15

FDE474

Maintenance:

Although the ice in this dispenser is completely
untouched, the water and ice vending systems will
need to be periodically sanitized and
de-mineralized. The air cooled condenser will also
need to be kept clean.

Schedule the sanitation, cleaning and
de-mineralization on a regular basis to keep the ice
clean and the machine operating efficiently.

Sanitation and Cleaning

Water System:

This ice machine requires periodic sanitation and
de-mineralization.

1. Vend all ice from the machine.

2. Remove top and right side panels.

3. Unplug or disconnect electrical power.

4. Shut off water supply.

5. Drain reservoir.

6. Mix 8 ounces of Scotsman Ice Machine Cleaner
and 3 quarts of hot (95

7. Pour the water into the reservoir.

8. Wait 15 minutes for the cleaner to dissolve the
minerals inside the evaporator.

Scotsman Ice Machine
Cleaner contains acids.
These compounds may
cause burns.

If swallowed, DO NOT
induce vomiting. Give
large amounts of water or
milk. Call Physician
immediately. In case of
external contact, flush
with water.

KEEP OUT OF THE
REACH OF CHILDREN.

9. Plug in the machine or reconnect electrical
power.

10. As the machine operates, pour in the balance
of the cleaning solution.

11. Reconnect water supply, operate the machine
for 15 more minutes, then switch it off.

o

F. -115oF.) potable water.

12. Repeat steps 3-11, except substitute a locally
approved sanitizing solution for the cleaner. A
possible sanitizing solution may be obtained by
mixing 1 ounce of household bleach with 2 gallons
of clean, warm (95

13. Unplug or disconnect electrical power.

14. Remove bin top, pour in warm potable water to
melt out any ice.

15. Pull out the vane and bin bottom from the bin.

16. Thoroughly wash the bin’s interior, bin top
interior, spout, ice vane and bin bottom with the
sanitizing solution. Pour some down the bin drain.

17. Reassemble the bin bottom, vane and bin
cover.

18. Wash the sink area with the sanitizing solution
and pour sanitizing solution down the sink drain.

19. Replace all panels and reconnect water and
electrical power.

Air Cooled Condenser:

1. Disconnect electrical power.

2. Remove top panel

3. Remove right and left side panels.

4. Use pressurized air to blow the lint from the
outside of the condenser in towards the fan motor.
A vacuum cleaner hose placed on near the fan
motor should pick up most of the dust. Check for
interior dirt. If needed, use coil cleaner to
de-grease the condenser.

5. Replace all panels and reconnect electrical
power.

o

F.-115oF.) water.

March 2000

Page 16

Auger and Bearing Inspection

While in most areas regular in-place cleaning with
Scotsman Ice Machine Cleaner will be adequate to
keep the interior of the evaporator free of
excessive mineral build up, some water conditions
may require more intense methods. In addition, the
auger bearings require physical inspection to
determine that they are not wearing. This physical
inspection is recommended twice per year for the
top bearing and once per year for the auger and
both bearings.

Whenever the auger is removed, replacement of
the water seal is recommended.

If a bearing requires replacement, the other
bearing must also be replaced.

1. Unplug or disconnect electrical power.

2. Shut off the water supply.

Rotating parts hazard.

Disconnect Electrical
Power Before
Beginning.

Auger & Bearings

Breaker

Screws

FDE474

Snap Ring

Cap

Cap Screw

Washer

Top Bearing

Set

Breaker

Auger

3. Remove top panel.

4. Remove right side panel.

5. Drain the evaporator and reservoir.

6. Remove foam cap on top of evaporator.

7. Remove 2 permagum plugs from the side of the
evaporator.

8. Remove 2 screws (screwheads were covered by
the permagum).

9. Pull up on the pull ring to remove the auger. If it
is difficult to pull:

A. Remove the breaker cover by taking the snap
ring out.

B. Unscrew the auger bolt.
C. Use threaded rod or a slide hammer puller and

screw into the auger, slide the weight quickly up
against the stop to remove the auger.

If the auger still will not move, bearing replacement
is mandatory. See Bearing Removal and
Replacement.

Bottom
Bearing

Water

Seal

Coupling

Adapter Stand

March 2000

Page 17

FDE474

Inspection: Auger

The auger is made of stainless steel. It has a
polished surface that may be either shinny or dull,
but must be smooth. After removal, allow the auger
to dry to inspect for scale. If mineral scale is found
on the auger’s surface, clean off the auger with ice
machine cleaner and a scrubbing pad.

Remove the water seal and clean off the shoulder
of the auger.

Bearings: The top bearing should spin freely with
no rough spots. If it feels rough when spun by
hand, replace it. There should be minimal rust or
dirt. If in doubt, replace the bearing.

Note: The top bearing used in the FDE474 is a
“directional” bearing. Note which way the inner
race is configured and install into the breaker. The
breaker is also available as a replacement part
with the top bearing already installed.

The bottom bearing must be removed from the
evaporator when replacing the water seal.

Remove bin cover.
Remove the three bolts holding the evaporator

to the gear motor
adapter and lift the
evaporator up slightly.
Tap the water seal
and bottom bearing
out from the top
down. Check the
bottom bearing the
same way as the top.

Replace the water
seal and install a new
bearing set if needed.

Outer

Race

Sealant

Here

To replace the water seal:

1. Remove old rotating half from the auger. Clean
the mounting area.

2. Place a bead of food grade sealant (such as
Scotsman part number 19-0529-01) onto the
shoulder of the auger where the rotating half of the
water seal will be installed.

3. Wash the new seal in water. While wet, slip it
onto the bottom of the auger, rubber side toward
the auger. Push up until seated against the
sealant. Do not allow any sealant to come into
contact with the face of the seal.

4. Wash the stationary half the water seal with
water. Slip it up into the bottom of the evaporator
until the bottom of the seal is inside the evaporator
about 1/4".

5. Push the bottom bearing against the water seal
until the bottom bearing is inside the evaporator
about 1/16".

6. Replace the evaporator on the adapter, and
re-attach the stand using the original bolts.

7. Attach the auger to the top bearing and breaker.

8. Return the auger to the evaporator and slide it
down until the splines touch the
coupling.

9. Rotate the auger until the coupling
splines align with the auger.

Inner Race

Wider on Top

Side

10. Push the auger down, and rotate
the breaker until the screw holes line up
with the pilot holes in the evaporator.

11. When the auger is completely
seated, reinstall the breaker screws.

12. Replace permagum and foam top.

13. Switch on the water supply.

Open
Sides

14. Check bin cover for electrical
grounds and switch on the electrical
power.

15. Observe operation. The unit should
make minimal noise while producing
ice. Catch first 2 minutes of ice and
discard it.

16. Replace the bin cover and all
panels.

Rubber

Smooth

Side

Water Seal

March 2000

Page 18

Inspection:

Photo-Electric Eyes

The photo electric eyes used to “see” the ice build
up in the top of the bin cover must be clean to get
a good “look” at the ice. If clouded by mineral
scale, the eyes will cause the ice machine to shut
off and stay off.

To clean the photo-electric eyes.

1. Remove the top panel.

2. Pull both of the photo-electric eyes out of their
rubber grommets.

3. Wash both eyes with a clean cloth dipped in
Scotsman Ice Machine Cleaner.

4. Wash the eyes off with clean water.

5. Replace the eyes in the grommets

6. Replace the top panel

Water Level Sensor

The water level sensor may not shut the ice
machine off when the reservoir goes dry if there is
a film of mineral scale on the probe tip.

1. Remove the top panel.

2. Remove the reservoir cover.

3. Pull the water level probe up and out of the
reservoir.

4. Carefully wipe the tip of the probe with a clean
cloth. Ice machine cleaner may be needed.

Note: The tip is made of glass.

5. Reinsert the water level sensor in the reservoir.

6. Replace the reservoir cover and the top panel.

FDE474

Clean Photo-Electric

Eyes

Coupling

Use the grease zerk on the side of the coupling to

add grease once per year.

That concludes normal maintenance. If the fan
motor has an oil plug, it may be oiled after 10 years
of operation.

March 2000

Water Level Probe,

keep the tip clean.

Page 19

FDE474

Service Diagnosis

PROBLEM POSSIBLE CAUSE PROBABLE CORRECTION

No ice is dispensed. No ice in bin due to:

No electrical power

·

Overuse

·

Water supply turned off

·

Bin controls dirty

·

Water sensor dirty

·

Control system malfunction

·

Auger drive motor open

·

Centrifugal switch open

·

Auger does not turn

·

No refrigeration

·

Ice in bin, but will not dispense:
Drive motor does not turn

Vend switch does not close

·

Dispense motor open

·

· Dispense output shaft broken

Ice in bin, motor turns vane.
Ice jammed up

·

Users held cup against
dispense spout and jammed
unit.

·

Bin bottom slot not over spout

·

Ice will not slide down bin wall,
bin out of round.

·

Sink height too small for
container used

·

Wet ice in the bin from high
water level or high suction
pressure

Check/restore power

Recheck ice needs vs. machine
capacity.

Check water filter/hand valve/float
valve

Check & clean bin control (electric
eyes)

Check & clean water sensor

Check control system

Check auger drive motor

Check centrifugal switch

Check coupling & gear reducer

Check refrigeration system

Check/replace vend switch

Check/replace dispense motor

Check/replace output shaft

Advise owner/manager to instruct
users.

Check bin bottom position

Check bin interior wall for rough
texture or out of round.

Install sink extension kit

Check water level, check suction
and discharge pressures

March 2000

Page 20

FDE474

Service Diagnosis

PROBLEM POSSIBLE CAUSE PROBABLE CORRECTION

Unusual noise Mineral scale in evaporator Clean water system with ice

machine cleaner.
Auger coupling dry Grease coupling
Auger coupling worn Replace coupling and adapter

stand.
Bearings worn Replace bearings and water seal.
Gear motor loose on frame Tighten bolts, check grommets
Low water level Check water level in reservoir
Tubing vibrating Check tubing for contact
Tooth on a gear missing Check gears in auger drive
Compressor too loud Replace compressor
Gear noise Check gear motor for oil leak

No water is dispensed Water Switch in Off position Switch to ON

Water switch open Replace switch
Water solenoid plugged up Clean inlet screen of solenoid
Water solenoid coil open Replace solenoid
Vend switch open Replace switch
Water turned off Restore water supply

Water drips from spout Melting ice in chute Some water dripping is normal

Water solenoid leaks thru Replace solenoid
Ice jammed in spout Clear ice jam, check for cause
Bin drain restricted Clean drain, check bin drainage

Ice will not stop dispensing Vend switch stuck closed Replace switch
Water leaks from cabinet Evaporator water seal worn or

cracked
Tubing to evaporator leaks Replace tubing/fittings
Drain leaks Check drain tubes and fittings
External drain restricted Clean out drain

No refrigeration Gear motor does not turn Check motor

Centrifugal switch does not close Check switch
Fan motor does not turn Check fan motor
Lack of refrigerant Add refrigerant, if problem is

Compressor does not pump Check/replace start capacitor

Replace seal and bearings

reduced, locate leak and repair it.

Check/replace start relay

Check/replace compressor

March 2000

Page 21

FDE474

Electrical System

CONTROL SYSTEM DIAGNOSTICS

The control system consists of:

Control Board

·

Water Sensor

·

Ice Sensors

·

If the unit is OFF, check the control board:

1. Is the Power OK light on? If not check power to
the unit. If it has power, and the Power OK light is
NOT on, check the high pressure and low pressure
cut outs. If they are both closed, replace the board.
If the Power OK light is ON, go to the next step.

2. Is the Water OK light on? If it is, go to the next
step. If not, check the water level in the reservoir. If
there is water in the reservoir, check that the water
sensor is plugged in. To check the water sensor:

A. Unplug water sensor.
B. Pull water sensor from reservoir.
C. Place one ohmmeter lead on the sensor's plug

and the other on the sensor's tip. The meter should
show nearly zero resistance. If it reads infinite
resistance, check the tip for corrosion. If it is clean
and still reads open, replace the sensor.

OR connect a copper wire to the wire where the
water sensor plugs into and place the other end in

the water. The water OK light should go ON. If it
does not, replace the control board.

3. Ice sensor check. Is the Bin Full light Off? If it is
OFF and the Service light is Off, and the unit is not
running, replace the control board.

If it is OFF and the auger motor is running but the
compressor is not, check the compressor contactor
coil.

If it is on, the ice sensors may be blocked. Remove
them and check for mineral scale. Scotsman's test
box can also be used to determine if the ice
sensors or board are defective.

Using the tester:
A. Disconnect the ice sensors at the connection by

the ice chute. Connect the LED and PHOTO
TRANS wires to the control board's wires.

B. Move the Bin Full switch on the tester to Bin Full

- the tester's light will blink and after a few seconds
the bin full light on the control board will come on.
If not, replace the board.

Move the Bin switch on the tester to Bin Empty.
The light on the tester will go out, and after a few
seconds the Bin Full light on the board will go out.
If master switch is ON, the unit should start.

.

March 2000

Page 22

Removal and Replacement

FDE474

Panels:

1. Remove two screws at the back of the top panel.

2. Lift up at the back and push the top panel
forward to release it.

3. Remove 3 screws at the top, 3 screws at the
bottom and 1 screw at the front edge of each side
panel.

4. Push each side panel to the rear to release the
panel from the cabinet frame.

Dispensing System

The dispensing system consists of the vend switch,
dispense motor, dispense vane, bin bottom and
bin.

Vend Switch

Electrical Shock Hazard

Disconnect electrical
power before beginning.

9. Reverse to reassemble, be certain that the new
wire nuts are secure and that the ground strap is
reattached.

Dispense Drive

Motor

Bin Top

1. Disconnect electrical power

2. Remove top panel

3. Remove right side panel.

4. Mark position of switch retaining screws in the
slots of the switch bracket.

5. Remove two screws holding vend switch to
mounting bracket.

6. Disconnect wires from vend switch

7. Remove switch from the machine.

8. Reverse to reassemble and install in the same
position as the original.

Dispense Gear Motor

1. Disconnect electrical power.

2. Remove top panel.

3. Remove one screw holding ground strap to
cabinet frame.

4. Cut off two dispense motor wire nuts.

5. Remove screws holding dispense drive gear
motor to the bin top.

6. Pull gear motor off the bin top.

7. Unscrew the output shaft extension from the
gear motor.

8. Remove screws holding the mounting bracket to
the gear motor.

Dispense Vane

1. Disconnect electrical power.

2. Remove top panel.

3. Remove four thumb screws holding bin cover to
bin.

4. Lift bin cover off bin. Set aside.

5. Grasp the ice vane and pull it straight up.

6. Reverse to reassemble.

Bin Bottom.

Perform steps 1-5 above (to remove the dispense
vane).

1. Lift bin bottom out of the dispense bin.

2. When replacing, be sure that the slot on the bin
bottom is over the dispense chute (at the front).

March 2000

Page 23

FDE474

Water System

The water system consists of the reservoir and
inlet water valve.

Reservoir.

1. Shut off the water supply.

2. Remove the top panel.

3. Remove the right side panel.

4. Drain the water reservoir and evaporator.

5. Disconnect inlet and outlet tubes from the
reservoir.

6. Remove screws holding reservoir to its mounting
bracket.

7. Remove reservoir from the machine.

8. Reverse to reassemble.

Float Valve

1. Shut off the water supply.

2. Remove the top panel.

3. Remove the reservoir cover.

4. Remove the water inlet tube.

5. Push in the mounting tabs at the back of the
reservoir and lift the valve out of the reservoir tank.

6. Replace with a new valve or replace the valve
plunger.

Valve Plunger

1. After the valve has been removed from the
reservoir, remove the nut holding the valve to its
mounting bracket.

2. Pull out the cotter pin to release the internal
valve plunger.

Note: Do not replace the plunger if the valve’s seat
is damaged. Replace the valve.

Inlet Water Valve.

1. Disconnect electrical power.

2. Shut off the water supply.

3. Remove the top panel.

4. Remove the right side panel.

5. Remove wire harness from inlet water valve.

6. Remove tube connecting outlet of the valve to
the dispense tube.

7. Rotate the valve to unscrew it from its inlet
fitting.

8. Reverse to reassemble.

Plunger

Valve

Water Level
Sensor Slot

March 2000

Page 24

Bearings, Water Seal and Auger

FDE474

1. Disconnect electrical power.

Rotating parts hazard.

Disconnect Electrical
Power Before

2. Shut off the water supply.

3. Remove the top panel.

4. Remove the side panels.

5. Drain the reservoir and evaporator.

6. Remove foam cap from the top of the

evaporator.

7. Remove the two permagum plugs from the side
of the evaporator.

8. Pull up on the ring to lift the auger out of the
evaporator.

If the auger will not lift out:

1. Remove snap ring holding bearing cover to
breaker.

2. Remove bearing cover.

3. Unscrew bolt holding bearing to auger.

4. Thread in a threaded rod and weight or
slide-hammer puller into the auger.

5. Use the threaded rod & weight or slide hammer
puller to remove the auger.

Or

1. Remove three cap screws holding evaporator to
the adapter stand.

2. Lift evaporator up slightly and tip the bottom out
to expose the splined end of the auger.

3. Use a plastic mallet or dead-blow hammer to tap
the bottom of the auger and force the auger up. Do
NOT damage the splines of the auger or the auger
will have to be replaced.

If the auger is “frozen” to the bottom bearing, do
not force the bottom bearing thru the evaporator.

1. Remove three cap screws holding evaporator to
the adapter stand.

2. Lift evaporator up slightly and tip the bottom out
to expose the splined end of the auger.

3. Remove snap ring holding bearing cover to
breaker.

4. Remove bearing cover.

5. Unscrew bolt holding bearing to auger.

6. Screw a length of threaded rod or a shoulder
screw into the auger.

7. Tap on the end of the threaded rod to push the
auger out of the bottom of the evaporator.

8. Replace the bearings and water seal. Replace
the auger if the splines are damaged. Replace the
evaporator if more than 1/3 of the vertical rifle
grooves are gone. Sand or hone and sand the
inside of the evaporator if mineral build up is
heavy.

Snap Ring

Cap

Bolt

Washer

Top Bearing

Breaker

Auger

March 2000

Page 25

Water Seal

Coupling

FDE474

Bearing Replacement:

Top Bearing Replacement

If the inner race is secure, use an arbor press to
push the top bearing out of the breaker. If the inner
race has separated from the bearing, replace the
breaker.

Insert a new bearing in the breaker, check for
orientation:

The top of the bearing has a wider inner race and a
narrower outer race than the bottom.

Replace the “O” ring in the breaker.

Push the bearing in, push only on the outer race.

Outer

Race

Sealant

Here

Rubber

Smooth

Side

Water Seal & Bottom Bearing Replacement:

1. Remove old rotating half from the auger. Clean
the mounting area.

2. Place a bead of food grade sealant (such as
Scotsman part number 19-0529-01) onto the
shoulder of the auger where the rotating half of the
water seal will be installed.

3. Wash the new seal in water. While wet, slip it
onto the bottom of the auger, rubber side toward
the auger. Push up until seated against the
sealant. Do not allow any sealant to come into
contact with the face of the seal.

4. Wash the stationary half the water seal with
water. Slip it up into the bottom of the evaporator
until the bottom of the seal is inside the evaporator
about 1/4".

5. Push the bottom bearing against the water seal
until the bottom bearing is inside the evaporator

about 1/16".

6. Replace the evaporator on the adapter,
and re-attach the stand using the original
bolts.

7. Attach the auger to the top bearing and

Inner Race

Wider on Top

Side

Open
Sides

breaker.

8. Return the auger to the evaporator and
slide it down until the splines touch the
coupling.

9. Rotate the auger until the coupling
splines align with the auger.

10. Push the auger down, and rotate the
breaker until the screw holes line up with
the pilot holes in the evaporator.

11. When the auger is completely seated,
reinstall the breaker screws.

12. Replace permagum and foam top.

13. Switch on the water supply.

14. Check bin cover for electrical grounds
and switch on the electrical power.

15. Observe operation. The unit should
make minimal noise while producing ice.
Catch first 2 minutes of ice and discard it.

16. Replace the bin cover and all panels.

Water Seal

March 2000

Page 26

Refrigeration System

This ice machine uses R-134a as the
refrigerant. This refrigerant has no chlorine,
and therefore requires polyolester type
refrigerant oil. This oil requires specific service
procedures.

General Service

A HFC type liquid line drier is required. “Standard”
driers may not take out enough moisture and may
affect the oil additives.

The time that the refrigeration system is open to
the air must not exceed 15 minutes. The oil will
rapidly absorb moisture from the air, and the
contact time must be kept to a minimum.

A special or very sensitive electronic leak detector
will be needed to locate refrigerant leaks. Many are
on the market that will sense R-134a.

The access valves must be in the closed position
before the hose caps are removed. Do not remove
the hose caps before checking the position of the
valve. Use a 3/16" allen wrench to open and close
the valve.

Stem Cap

Torque Stem to

6-8 ft. lb.

Access Valve

As with any other refrigerant, do not place
pressurized air or oxygen into the refrigeration
system.

Note: The refrigeration system uses an HFC type
refrigerant and MUST use an HFC type drier.

Evacuation to 300 microns is recommended.

Torque to 8-12 ft. lb.

Fitting Cap

Torque to 7-12 ft. lb.

FDE474

Temperature Pressure Chart, Selected Points
Temperature in0F. PSIG of R-134a

-10 2.0

-6 3.7

-4 4.6

-2 5.5
0 6.5
1 7.0
2 7.5
3 8.0
4 8.6
5 9.1
10 12.0
12 13.2
14 14.4
16 15.7
18 17.1
20 18.4
25 22.1
30 26.1
31 26.9
32 27.8
33 28.6
34 29.5
35 30.4
40 35.0
45 40.0
50 45.4
75 78.7
90 104.3
110 146.4
120 171.1
130 198.7
150 262.8

March 2000

Page 27

FDE474

Gear Reducer Removal

1. Disconnect electrical power.

Electrical Shock Hazard

Disconnect electrical
power before beginning.

2. Shut off the water supply.

3. Remove the top and side panels.

4. Remove the control box cover.

5. Remove the centrifugal switch cover on the top
of the auger drive motor.

6. Disconnect the electrical wires from the
centrifugal switch.

7. Drain the evaporator and reservoir.

8. Disconnect the water inlet tube from the
evaporator.

9. Remove the three screws holding the evaporator
to the adapter stand.

10. Lift the evaporator up high enough for the
auger to clear the adapter stand.

11. Remove the mounting bolts holding the gear
reducer to the cabinet frame.

12. Trace auger drive motor wires back to the
control box.

13. Disconnect the drive motor wires from the relay
on the circuit board.

14. Pull the wires back to the auger drive motor.

15. Pull the gear reducer out the side of the cabinet
to remove it from the machine.

Note: If there is evidence of water near the output
shaft of the gear reducer, it would be a wise
precaution to pull the auger from the evaporator
and check the bearings.

16. Rebuild or replace the gear reducer.

Motor Cover &

Bearing

Fan

Stator

Rotor

Rotor

Bearing

Shaft Seals- 2,

back to back

E-Clip

Woodruff Key

Output Gear

Gear Reducer Components

Gear Case

March 2000

Page 28

Auger Drive Motor

FDE474

The windings or top bearing & cover may be
replaced without removing the evaporator or gear
reducer from the machine.

1. Disconnect electrical power.

2. Shut off water supply.

Electrical Shock Hazard

Disconnect electrical
power before beginning.

3. Remove top panel.

4. Remove right side panel.

5. Drain the reservoir and evaporator.

6. Disconnect the reservoir outlet tube from the
bottom of the reservoir.

7. Remove screws holding reservoir mounting
bracket to the cabinet.

8. Lift the reservoir up & away from the top of the
auger drive motor.

9. Remove the 4 bolts holding the auger motor
cover to the gear reducer case.

10. Lift the plastic switch housing off the auger
drive motor.

11. Hold the centrifugal switch and remove the
screw holding it to the rotor of the motor.

12. Lift the centrifugal switch up and off the motor.

13. Lift the motor cover up and off the motor.

14. Pull the fan up and off the rotor.
If the windings are to be replaced, remove the left

side panel and control box cover.

1. Locate the auger drive motor wires plugged into
a relay on the circuit board.

2. Disconnect the auger motor’s wires and pull
them back to the auger drive motor.

3. Lift the auger motor windings off the gear
reducer.

If the rotor needs to be removed:

1. Run a screw into the top of the rotor.

2. Grasp the screw with a grip pliers.

3. Pull and/or tap on the pliers to pull the rotor &
bearing out of the gear reducer.

4. Inspect the bearing and input seal. Replace
them if worn.

Note: When the rotor is re-installed, be certain that
the bearing is fully seated in the gear case.

Gear Reducer Rebuild

1. After the gear reducer has been removed, the
internal components may be inspected and/or
replaced. Remove all bolts holding the two case
halves together.

2. Tap against the roll pins at each end of the gear
cases to split them.

3. Pry the case halves apart.

4. Check the internal condition of the gear reducer.
If rusty or water is present, replace the complete
assembly. The oil should be black and the proper
oil level is 1/8" from the top of the biggest gear
(with all gears installed). Check the input seal.

The gears may be replaced individually.

March 2000

Page 29