Scotsman FME1204, NME954 SERVICE MANUAL

INTRODUCTION

NME954 & FME1204

To the owner or user: This manual is intended to
provide you, and the maintenance or service
technician, with the information needed to install,
start up, clean, maintain, and service this ice
system.

This is a modular type ice system that fits a variety
of Scotsman ice storage bins.

Its features include: front service for the freezer,
gear motor, control box, water reservoir, and bin
control; an electronic circuit for monitoring ice and
water level; a thermostatic expansion valve; and
R-404A as the refrigerant.

Table of Contents

FOR THE INSTALLER ······································ Page 2
SAMPLEBINANDMACHINECOMBINATIONS························· Page 3
FOR THE INSTALLER ······································ Page 4
FOR THE INSTALLER: Location ································· Page 5
FORTHEPLUMBER······································· Page 6
FOR THE ELECTRICIAN ····································· Page 7
FOR THE INSTALLER ······································ Page 8
START UP············································· Page 9
COMPONENT DESCRIPTION ·································· Page 10
COMPONENT DESCRIPTION ·································· Page 11
CONTROL BOX: Components ·································· Page 12
ELECTRICAL SEQUENCE: ··································· Page 13
OPERATION: Water········································ Page 14
OPERATION: Performance ···································· Page 15
SANITIZING AND CLEANING ·································· Page 16
SENSORMAINTENANCE ···································· Page 17
BEARING MAINTENANCE ···································· Page 18
MAINTENANCE: Air Cooled···································· Page 19
AUGERMAINTENANCE····································· Page 20
SERVICEDIAGNOSIS······································ Page 21
SERVICEDIAGNOSIS······································ Page 22
CONTROL SYSTEM DIAGNOSTICS ······························· Page 23
REMOVAL AND REPLACEMENT: Water Reservoir & Bin Controls ··············· Page 24
REMOVAL AND REPLACEMENT: Bearing And Breaker ····················· Page 25
REMOVAL AND REPLACEMENT: Auger····························· Page 26
REMOVAL AND REPLACEMENT: Water Seal ·························· Page 27
REMOVAL AND REPLACEMENT: Evaporator ·························· Page 28
REMOVAL AND REPLACEMENT: Gearmotor ·························· Page 29
REMOVAL AND REPLACEMENT: Fan Blade and Motor····················· Page 30
REFRIGERATION SYSTEM SERVICE ······························ Page 31
What to Do Before Calling for Service······························· Page 32

This manual was printed on recycled paper. Keep
it for future reference.

Note the warning symbol
where it appears. It marks a
possible hazard.

May 2001

Page 1

NME954 & FME1204

FOR THE INSTALLER

BACK VIEW: AIR COOLED

Note: Allow 6" behind

and 6" above either

unit for air circulation,

utility connections,

ELECTRICAL

5.25"

3"

WATER INLET

3

" FLARE

8

DRAIN

¾" FPT

2.1"

5.7"

These models are designed to fit the following
Scotsman storage bins:

·

SB480 and extensions (with bin top KBT18)

·

BH800 using bin top KBT15 (one unit) or KBT25
(two units).

·

BH801 using bin top KBT28

·

BH900 with KBT24 (one unit)

·

BH900 with KBT25 (two units side by side)

INLET

9.5"

Condenser Inlet

Condenser Drain ½" FPT

NME954 Dispenser Applications

The NME954 can be placed on and used with
certain ice and ice-beverage dispensers. Kits are
required for proper operation:

·

ID150 use adapter KBT42 and KNUGDIV

·

ID200 or ID250, use adapter KBT46 and
KDIL-N-ID2

·

Cornelius ED/DF200 beverage dispensers, use
KBT46 and KDIL-N-200

BACK VIEW: WATER COOLED

3

" FPT

8

DRAIN

¾" FPT

2.9"

3.4"

4.9"

7.46"

ELECTRICAL

INLET

WATER INLET

3

" FLARE

8

7.3"

5.25"

3"

9.43"

·

Cornelius ED/DF250 beverage dispensers, use
KBT46 and KDIL-N-250

SPECIFICATIONS: Ice Machine

Model Number Dimensions

(w/o bin)

WxDxH

FME1204AS-3B 21" x 24" x 27" 208-230/60/3 FLAKE Air 8.4 15 30 oz
FME1204WS-3A same same FLAKE Water 7.9 15 24 oz
FME1204WS-3B same same FLAKE Water 7.9 15 22 oz
FME1204AS-32B same 208-230/60/1 FLAKE Air 11.3 15 30 oz
FME1204WS-32A same same FLAKE Water 10.8 15 24 oz
FME1204WS-32A same same FLAKE Water 10.8 15 22 oz
NME954AS-3B same 208-230/60/3 NUGGET Air 8.4 15 30 oz
NME954WS-3A same same NUGGET Water 7.9 15 24 oz
NME954WS-3B same same NUGGET Water 7.9 15 22 oz
NME954AS-32B same 208-230/60/1 NUGGET Air 11.3 15 30 oz
NME954WS-32A same same NUGGET Water 10.8 15 24 oz
NME954WS-32B same same NUGGET Water 10.8 15 22 oz

Basic Electrical Ice Type Condenser

·

Lancer nugget IBD, use KDIL-N-L & Lancer kit.

Type

Minimum

Circuit

Ampacity

Maximum
Fuse Size

Refrigerant

Charge

R-404A*

* Refrigerant charge change on water cooled. Always check the nameplate for charge data.

December 2004

Page 2

NME954 & FME1204

SAMPLE BIN AND MACHINE COMBINATIONS

The Nameplate is

located on the back

of the machine.

FME1204 ON BH550*

NME954 ON BH800*

May 2001

Page 3

FME1204 ON BH900*

* Bin Top Kit Required

NME954 & FME1204

FOR THE INSTALLER

Notice:

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.

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

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

Location:

Installation Limitations:

This ice system is designed to be installed indoors,
in a controlled environment:

Min Max

Air Temperature 50
Water Temperature 40
Water Pressure 20 PSI 80 PSI

Voltage 198 253
(Compared to the nameplate)
Operating the machine outside of the limitations is

misuse and can void the warranty.
RO Water Limitation: Water conductivity must be
no less than 35 microSiemens/cm.
Only install the machine in a location where there

is enough space around it so that it is accessible
for service.

Keep the back of air cooled machines a minimum
distance of 6" from a wall for air circulation. Try to
avoid hot, dirty and crowded locations. Be sure that
the location for the machine is within the
environmental limitations.

0

F 1000F

0

F 1000F

Storage Bin:

Tip the storage bin on its back, using parts of the
carton to protect the exterior finish. Remove the
skid and install the legs into the threaded holes in
the bottom of the bin. Turn the leg levelers all the
way in preparation for leveling later. Return the bin
to the upright position, remove paper covering the
bin gasket.

Note: Do not push bin into position, instead lift it
there. Pushing a bin, especially one with ice in it,
can cause damage to the legs and the leg mounts.

Install the appropriate bin top on the bin, according
to the instructions for the bin top.

Ice Machine:

The machine is heavy, so the use of a mechanical
lift is recommended for lifting the machine high
enough to install on top of the bin. After the unit is
placed on the bin, line it up so it is even with the
back side. Secure the machine to the bin with the
hardware provided with the machine.

Remove the front panel and remove any shipping
blocks.

June 2002

Page 4

FOR THE INSTALLER: Location

A proper installation locates the machine indoors, but in a
place where the heat and noise it produces are not
objectionable.

Air cooled machines discharge hot air out the back. 6" of space
behind the machine is the minimum required for adequate
operation of an air cooled unit.

Space for maintenance access is also important. If two units
are placed side by side on a bin, side access becomes even
more important.

NME954 & FME1204

May 2001

Page 5

NME954 & FME1204

FOR THE PLUMBER

CONFORM TO ALL APPLICABLE CODES

Water Inlet

Air Cooled Models: The recommended water

supply is clean, cold water. Use
tubing, connect to the

3

" male flare at the back of

8

the cabinet. Install a hand valve near the machine
to control the water supply.

Water Treatment: In most areas, a water filter of
some type will be useful. In areas where the water
is highly concentrated with minerals the water
should be tested by a water treatment specialist,
and the recommendations of the specialist
regarding filtration and/or treatment should be
followed.
Water Cooled Models: A separate
line is recommended, with a separate hand valve
to control it. Connect it to the
inlet at the back of the cabinet. The water pressure
to all lines must always be above 20 psig, and
below 80 psig.

3

" O.D. copper

8

3

" O.D. copper

8

3

" FPT condenser

8

Drains

Air Cooled Models: Connect a rigid drain tube to

3

the

" FPT drain fitting at the back of the cabinet.

4

The drain is a gravity type, and ¼ inch per foot fall
is the minimum acceptable pitch for the drain
tubing. There should be a vent at the highest point
of the drain line, and the ideal drain receptacle
would be a trapped and vented floor drain. Use

3

only
Water Cooled Models: Connect a separate drain

line to the
back of the cabinet. Do not vent this drain.

Storage Bin: Connect a separate gravity type
drain to the ice storage bin drain. Vent this drain if
there is a long horizontal run from the bin to the
floor drain. Insulation of this drain line is
recommended.

Field

Supplied

Filter

" rigid tubing.

4

1

" condenser drain connection at the

2

Hand
Valve

WATER

COOLED

Condenser

Inlet

Water Filter

Condenser

Drain

Hand
Valve

AIR COOLED

MODELS

Vented

Vented

Drain

Water

Inlet

May 2001

Page 6

Floor

FOR THE ELECTRICIAN

CONFORM TO ALL APPLICABLE CODES

NME954 & FME1204

Check the nameplate (located on the back panel)
for the voltage requirements, and for the minimum
circuit ampacity. The machine requires a solid
chassis to earth ground wire.

Connect the power supply to the wires leads in the
junction box on the back of the machine.

Connect the ice machine to its own electrical circuit
so it is individually fused. Voltage variation must

WATER COOLED

remain within the limitations, even under starting
conditions.

All external wiring must conform to national,
state, and local electrical codes. The use of a
licensed electrician is required to perform the
electrical installation.

POWER

SUPPLY

AIR COOLED

May 2001

Page 7

NME954 & FME1204

FOR THE INSTALLER

Final Check List

____1. Is the ice system installed indoors in a

location where the air and water
temperatures are controlled, and where
they do not exceed the design limitations?

____2. Is there an electrical service disconnect

within sight of the installed machine? Has
the voltage been checked, and compared
to nameplate requirements?

____3. Have all the plumbing connections been

made and checked for leaks?

____4. Has the machine and bin been leveled?

____5. Is there a minimum of 6" clearance at the

back of the machine for proper service
access and air circulation?

____6. Is the water pressure a minimum of 20

psig?

____7. Has the machine been secured to the bin?

____8. Is there clearance over the top of the

machine for service access?

____9. Is there a water shut off valve installed near

the machine?

____10. Have all of the shipping blocks been

removed?

May 2001

Page 8

START UP

Pre-Start Inspection

1. Remove the front and side service panels.

2. Check that any shipping blocks have been
removed.

3. Inspect the interior of the machine for loose
screws or wires. Check that no refrigerant lines
are rubbing each other. Check that the fan blades
turn freely (air cooled).

4. Check that the unit is installed correctly
according to the final check list (page 8).

Start Up

NME954 & FME1204

1. Go through the prestart inspection.

2. Open the hand valve, observe that water enters
the water reservoir, fills the tube from the reservoir
to the evaporator, and then shuts off. Check for
leaks.

3. Switch the master (mode) switch on.
The electrical start up sequence is automatic.
A. There should be a short (15 second) delay

before the gear motor starts.
B. After the gear motor starts, the compressor will

start.

4. On air cooled models, the condenser will begin
to discharge warm air, on water cooled models, the
water regulating valve will open, and warm water
will be discharged into the drain.

5. The unit should soon be making ice, if desired,
the low side pressure may be checked: it should be
32 psig + or - 2 psig.

The suction line temperature at the compressor is
normally very cold, nearly to the point of frost up to
the compressor body, but not on it.

The air cooled discharge pressure will depend
upon air and water temperatures, but should be
between 200 psig and 280 psig.

The water cooled discharge pressure should be
constant at about 245 psig.

The above numbers are for new, clean machines,
you can expect to see some values higher, and
some lower between different units.

6. THERE ARE NO ADJUSTMENTS TO MAKE,
so replace the panels.

7. Clean and/or sanitize the storage bin interior,
wipe off the exterior with a clean, damp cloth.

8. Give the owner/user the service manual, instruct
him/her in the operation of the unit, and make sure
they know who to call for service.

9. Fill out the manufacturer's registration and mail it
to Scotsman.

May 2001

Page 9

NME954 & FME1204

COMPONENT DESCRIPTION

Control Box: Contains the electrical controls that
operate the machine.

High Pressure Cut Out Switch: An auto-reset
switch sensing the high side refrigeration pressure.
It will shut the machine off if the discharge
pressure should ever exceed 450 psig.

Low Pressure Cut Out Switch: An auto-reset
switch sending the low side of the refrigeration
system. It will disconnect power to the circuit board
and shut down the machine if the low side
pressure falls too low.

Evaporator: A vertical stainless steel tube,
refrigerated and water filled. In it there is a
stainless steel auger.

Compressor: The refrigerant vapor pump.
Reservoir: Float operated, it maintains the water

level in the evaporator at a constant level, it also
contains the water level sensor.

Water Level Sensor: Senses if there is water in
the reservoir to make ice
out of. Will shut the
machine off it there is
none.

Ice Discharge Chute:
Directs the ice produced
by the evaporator into the
storage bin.

Ice Level Sensor: An
electronic “eye”, it senses
the presence of ice in the
bottom of the ice
discharge chute.
Operates to turn the ice
machine on and off
automatically as the level
of ice in the bin changes.

Gear Motor: An oil filled,
speed reduction gearbox,
driving the auger.

Drain Tube: When
uncapped and lowered,
drains the evaporator.

Condenser: Air or water
cooled, where the heat
removed in ice making is
discharged.

Expansion valve: The
refrigerant metering
device.

Hi Pressure

Cut Out

Low

Pressure

Cut Out

Compressor

AIR COOLED

CONTROL BOX

Reservoir

Condenser

Expansion

Valve

Drain

Tube

Ice Chute

Ice Level

Sensors

May 2001

Page 10

COMPONENT DESCRIPTION

NME954 & FME1204

Evaporator: A refrigerated vertical tube filled with

water and containing a water seal and auger.
Auger: A solid stainless steel double spiral auger,

it pushes the ice crystals up to the top of the
evaporator.

Water Seal: A two part “face” seal, the top half
rotating with the auger, the bottom half stationary,
the sealing action being where the two seal “faces”
meet.

Ice Sweep: A plastic cap with “fingers”. It revolves
with the auger to “sweep” the ice into the ice chute.

Breaker (Divider): Where the ice is compressed
and much of the extra water is squeezed out of it
before it is discharged into the bin.

Motor: A split phase motor that drives the gear
reducer.

Thrust Bearing: As the ice is pushed up the
evaporator, the auger is thrust down, and pressure
from the auger thrust is taken up by this bearing.

Ice Sweep

Bearing

Breaker/Divider

Water

Seal

Auger

Evaporator

May 2001

Page 11

Motor

NME954 & FME1204

CONTROL BOX: Components

Contactor: A definite purpose contactor
connecting the compressor and the fan motor to
the power supply.
Circuit Board: Controls the operation of the ice
machine using input from sensors and pressure
controls. Switches loads on and off thru relays.
See photo below.

Water OK Light

Potential Relay: The compressor start relay.
Mode (On/Off) Switch: Manual control for the

machine.

Control Board

Power Light

Service Light

Freeze Light

Bin Full

Light

LED1

Compressor

Relay

LED3

Auger

Relay

May 2001

Page 12

ELECTRICAL SEQUENCE:

NME954 & FME1204

There are 7 indicator lights on the control board:

WTR-OK (Water OK). Green. Normal =

·

Glowing. Glows when there is water in the
reservoir.

PWR-OK (Power OK). Green. Normal =

·

Glowing. Glows when the control board has
power and is functional.

Service. Red. Normally Off.

·

Freeze. Red. Normally glowing when making

·

ice.

Bin Full. Red. Normally Off when making ice.

·

LED1. White. Located next to the board’s

·

Compressor Relay. Normally Glowing when
making ice.

LED3. White. Located next to the board’s Auger

·

Motor Relay. Normally Glowing when making

ice.
If the machine is switched off at the mode switch,
but is otherwise ready to go, switching the mode
switch to ON 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.

·

As ice is made it passes between the ice level

sensors but because it is not a continuous

stream it only interrupts the sensor’s 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.

Shut Down:

The compressor relay opens, LED1 goes out.

·

The compressor contactor 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.

Control Board Protection Devices

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 auger motor’s current is excessive within 60

seconds after the restart, the process will be

repeated once more. If during 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: Switch power to the unit off and then
on.

Other Protection Devices:

·

If the high pressure cut out switch opens the

machine will stop immediately. It will

automatically reset when the high pressure falls

below its cut in point.

·

If the low pressure cut out switch opens the

machine will stop immediately. It will

automatically reset when the pressure rises

above its cut in point.

May 2001

Page 13

·

The mode (on - off) switch is the manual

control for the complete machine, but it is not a

service disconnect.

NME954 & FME1204

OPERATION: Water

Water enters the machine through the 3/8" male
flare at the rear of the cabinet, goes to the water
reservoir which it enters through the float valve.
The water then goes out the bottom of the
reservoir tank to the bottom of the evaporator.

Reservoir overflow or evaporator condensation is
routed to the drain. Water cooled models have a
separate water circuit for the cooling water: it

Water Inlet

Reservoir

enters the fitting at the rear, goes to the water
regulating valve, then to the water cooled
condenser and down the drain.

Water Level

Drain

Ice

Chute

Evaporator

Drain

Evaporator

Evaporator Inlet

May 2001

Page 14

WATER SCHEMATIC

OPERATION: Performance

Typical Low Side Pressure

Air Cooled: 34 - 38 PSIG

·

Water Cooled: 32 PSIG

·

Typical Discharge Pressure

Air Cooled: 220 - 275 PSIG

·

Water Cooled: 245 PSIG

·

Typical Compressor Amp Draw

Single phase = 4.3

·

Three phase = 2.8

·

Superheat

5 - 7 degrees

·

High Pressure Cut Out (auto reset)

450 PSIG

·

NME954 & FME1204

Low Pressure Cut Out (auto reset)

15 PSIG

·

Refrigerant Charge

· Air Cooled: 30 ounces R-404A

·

Water Cooled: 24 ounces R-404A

Condenser

Liquid

Line

Fan

Motor

Discharge

Line

Suction Line

Evaporator

Refrigeration Schematic

May 2001

Page 15

Thermostatic

Expansion Valve

Compressor

Gear

Motor

NME954 & FME1204

SANITIZING AND CLEANING

It is the USER’S RESPONSIBILITY to keep the ice machine and ice storage bin in a sanitary condition.
Without human intervention, sanitation will not be maintained. Ice machines also require occasional
cleaning of their water systems with a specifically designed chemical. That chemical dissolves mineral
build up that forms during the ice making process.

Sanitize the ice storage bin as frequently as local health cods require, and every time the ice machine is
cleaned and sanitized.

Maintenance and Cleaning should be scheduled at
a minimum of twice per year.

ICE MAKING SYSTEM: In place cleaning

1. Check and clean any water treatment devices, if
any are installed.

2. Remove screws, and the front and top panels.

3. Move the ON-OFF switch to OFF.

4. Remove all the ice from the storage bin.

5. Remove the cover to the water reservoir and
block the float up.

6. Drain the water reservoir and freezer assembly
using the drain tube attached to the freezer water
inlet. Return the drain tube to its normal upright
position and replace the end cap.

7. Prepare the cleaning solution: Mix eight ounces
of Scotsman Ice Machine Cleaner with three quarts
of hot water. The water should be between 90-115
degrees F.

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.

8. Slowly pour the cleaning solution into the water
reservoir until it is full. Wait 15 minutes, then
switch the master switch to ON.

9. As the Ice Machine begins to use water from
the reservoir, continue to add more cleaning
solution to maintain a full reservoir.

10. After all of the cleaning solution has been
added to the reservoir, and the reservoir is nearly
empty, switch the master switch to OFF.

11. After draining the reservoir, as in step 6, wash
and rinse the water reservoir.

May 2001

12. Go thru steps 13-18 to sanitize the ice machine
water system.

13. Mix two gallons of sanitizer solution. Use an
approved sanitizer.

A possible sanitizer solution may be obtained by
mixing two gallons of warm (90-115

o

F.) potable

water with 1 ounce of household bleach.

14. Slowly pour the sanitizer solution into the water
reservoir until the float rises, then switch the
master switch ON.

15. As the ice machine uses water from the
reservoir, continue to pour the sanitizer solution
into the reservoir.

16. After

1

of the sanitizer solution has been added

2

to the reservoir, and the reservoir is nearly empty,
switch the master switch OFF.

17. Drain the reservoir and thoroughly wash the
interior of the reservoir and cover with sanitizer
solution.

18. Remove the block from the float in the water
reservoir.

19. Switch the master switch to ON

20. Continue ice making for at least 15 minutes, to
flush out any cleaning solution. Switch the master
switch OFF.

DO NOT USE any ice produced from the
cleaning solution.

Be sure no ice remains in the bin.

21. Remove all ice from the storage bin.

22. Add warm water to the ice storage bin and
thoroughly wash and rinse all surfaces within the
bin.

23. Sanitize the bin interior by thoroughly washing
the interior of the bin and bin door with the balance
of the sanitizer solution.

24. Switch the master switch ON.

25. Replace the panels.

Page 16

SENSOR MAINTENANCE

NME954 & FME1204

1. The bin control uses devices that sense light,
therefore they must be kept clean enough so that
they can “see”. At least twice a year, remove the
bin control sensors from the base of the ice chute,
and wipe the inside clean, as illustrated.

Ice Level Sensors:

Slide To Remove

Clean The Ice
Level Sensors

2. The ice machine uses a probe in the reservoir to
determine if there is water.

At least twice a year remove the
probe from the reservoir and wipe
the tip clean of mineral build-up.

Clean the Probe's Tip with ice
machine cleaner and a clean,
soft cloth.

May 2001

Page 17

NME954 & FME1204

BEARING MAINTENANCE

The bearing in the breaker should also be checked
at least two times per year.

Switch the machine Off and check the bearing:

removing the ice chute cover

·

Chute Cover

unscrewing the ice sweep

·

Ice Sweep

unscrewing the auger stud

·

Auger Stud

Cap Screw

Inspect the bearing. There should be plenty of
grease in sight. If grease is needed the bearing
and breaker should be removed to check the
action of the bearing. It should rotate smoothly.

To remove the breaker remove the lower ice chute
then take out all four allen head cap screws and
pull the breaker off the auger and evaporator.

If the bearing only needs grease, inject grease into
the bearing using Scotsman grease needle pn
02-3559-01 and Scotsman bearing grease
cartridge, pn A36808-001. Be sure to inject grease
evenly and thoroughly.

·

removing the water shed & unscrewing the
breaker cover (left hand threads).

O

f

f

Breaker

Cover

Bearing

See Removal and Replacement section to replace
bearing or seals.

Reverse to reassemble.

Needle, pn

02-3559-01

May 2001

Page 18

MAINTENANCE: Air Cooled

NME954 & FME1204

Clean or replace the air filter.

REMOVE TWO SCREWS & UNPLUG FAN MOTORS.

PULL FAN MOTOR ASSEMBLY UP AND

TO THE RIGHT TO REMOVE

Clean the air cooled condenser.
Air flow on this model is from front to back, so the

inside of the machine will have to be available to
clean the air cooled condenser. Use a vacuum
cleaner or coil cleaner if needed. Do NOT use a
wire brush.

Electrical shock hazard.

Electrical shock can cause
personal injury.
Disconnect power before
beginning to service
components.

A. Disconnect electrical power, and remove the
filter. The filter may be cleaned or replaced.

B. Clean the condenser: the condenser may
appear to be clean on the surface, but it can still be
clogged internally. Check with a flash light from the
front to see if light can be seen though the
condenser fins. Reverse to reassemble.

May 2001

Page 19

NME954 & FME1204

AUGER MAINTENANCE

In some areas, the water supply to the Ice Machine
will contain a high concentration of minerals, and
that will result in an evaporator and auger
becoming coated with these minerals, requiring a
more frequent removal than twice per year. If in
doubt about the condition of the evaporator and
auger, the auger can be removed so the parts can
be inspected.

Note: Water filters can filter out suspended solids,
but not dissolved solids. “Soft” water may not be
the complete answer. Check with a water
treatment specialist regarding water treatment.

For more information on removal of these
parts, see REMOVAL AND REPLACEMENT.

Moving parts hazard.

Moving parts can cause
personal injury.
Disconnect power before
beginning to service
components.

edges, handle with care.

ALLEN

SCREWS

The auger has sharp

BREAKER &

BEARING &

AUGER

ASSEMBLY

Turn off the water supply.

1. To remove the auger, remove the front and top
panels.

2. Push back bail clamp holding ice chute cover to
ice chute, and remove cover.

3. Unscrew and remove ice sweep.

4. Remove ice chute from evaporator.

5. Remove 4 allen screws holding breaker to
evaporator.

6. Drain the evaporator by lowering and uncapping
the evaporator drain hose.

7. Pull up to remove auger.
After the auger has been removed, allow the auger

to dry: if the auger is not bright and shiny, it must
be cleaned.

Clean the auger and evaporator as required. DO
NOT HONE THE EVAPORATOR.

8. Replace the water seal.

9. Reverse to reassemble.

May 2001

Page 20

NME954 & FME1204

SERVICE DIAGNOSIS

Symptom Possible Cause Probable Correction

No ice is made, nothing operates Unit off due to no power Restore Power

Unit off due to master switch in OFF
position.

Unit off due to low water level. Check water supply, filter, strainer,

Unit off due to ice level sensors
(photo-electric eyes) blocked.

Unit off due to scale on water level
sensor.

Unit off due to high pressure control
open.

Auger motor hums but does not turn. Auger can’t turn. Circuit board has not

Unit is shut down Circuit board has shut ice machine

Low pressure control open Auger not turning due to: motor

No power to circuit board. Low pressure control open. See

Circuit Board gear motor relay will not
close

Water level or ice level sensor failed. Check, replace sensor

No ice, auger motor is turning Compressor contactor coil is open Check/replace contactor

Compressor will not start Check start capacitor.

Circuit board compressor relay will
not close.

Switch master switch to ON.

float valve. Correct water supply.

Check/clean ice level sensors.

Clean water level sensor.

Check for water interruption (water
cooled) or fan motor failure (air
cooled).

yet shut unit down.

down due to high auger motor amp
draw. Check for cause of high amp
draw, including bearings, gearmotor
condition and scale on auger and in
evaporator.

failure; auger relay failure on circuit
board; or gears stripped. Check drive
train.

TXV restricted or not metering. Check
bulb temperature.

Lack of refrigerant. Check for leak.

Check for a restricted system

above

High pressure control open. Fan
motor failure (a/c) or water shut off
(w/c)

Check harness

Check, replace board

Check start relay

Check compressor windings

Check, replace board

May 2001

Page 21

NME954 & FME1204

SERVICE DIAGNOSIS

Symptom Possible Cause Probable Correction

Water Leak Drain plugged up Clean out drain

Tubing cracked Replace tubing

Condensation on drain tubing Insulate tubing

Hose off Reattach hose

Reservoir cover off Return cover to reservoir

Reservoir cracked Replace reservoir

Evaporator water seal leaks Check base of evaporator & drip pan.

If the seal leaks, shut off the water,
remove the auger, replace the water
seal. Check gear motor for water
infiltration.

Excessive water use Water cooled model, water regulating

valve not adjusted properly.

Reservoir float valve leaks thru Replace float valve or seat

Water cooled model, overcharged
with refrigerant

Water cooled model, condenser
coated with minerals

Excessive ice meltage Bin drain clogged Clean out bin drain.

Improper installation of drains, they
are connected.

Poor fit between bin door and door
frame

Machine makes too much noise Evaporator coated internally with

minerals

Motor bearings dry Oil or replace motor

Adjust to 245 PSIG discharge
pressure

Recover and weigh refrigerant. Weigh
in correct charge.

Acid clean water cooled condenser.

Drains must be separate.

Adjust or replace

Clean with Scotsman Ice Machine
Cleaner

May 2001

Page 22

CONTROL SYSTEM DIAGNOSTICS

NME954 & FME1204

The control system consists of:

Control Board

·

Water Sensor

·

Ice Sensors

·

High Pressure Cut Out

·

Low Pressure Cut Out

·

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. With the On - Off (mode) switch in either
position, 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.

4. High pressure cut out check.
Disconnect electrical power.
Pull the wires off the high pressure cut out.
Use an ohmmeter to determine if the switch is

OPEN, If it is, check the discharge pressure. If the
discharge pressure is less than 300 PSIG, replace
the high pressure cut out.

If the high pressure cut out is open and the system
has high discharge pressure, check for the cause.

5. Low pressure cut out check.
Disconnect electrical power.
Pull the wires off the low pressure cut out.
Use an ohmmeter to determine if the switch is

OPEN, If it is, check the suction pressure. If the
suction pressure is greater than 20 PSIG, replace
the low pressure cut out.

If the low pressure cut out is open and the system
has low suction pressure, check for the cause.

May 2001

Page 23

NME954 & FME1204

REMOVAL AND REPLACEMENT: Water Reservoir & Bin Controls

WATER RESERVOIR

1. Shut off the water supply to the ice maker.

2. Remove front panel.

3. Remove reservoir cover.

4. Disconnect water inlet tube from reservoir inlet
fitting.

5. To remove float valve, push in “locking tabs” as
shown and pull float up.

Note: The plunger/seat is available separately as
a part.

6. To remove reservoir, pull up and remove water
sensor.

8. Disconnect water outlet tubes.

9. Remove mounting screws from reservoir
bracket, and remove reservoir from ice maker.

10. Reverse to reassemble.

FLOAT

ASSEMBLY

Water

Sensor

Slide Bin

Controls To

Remove

ICE

CHUTE

LOCKING

TABS

BIN CONTROLS (Ice Level Sensors)

1. Disconnect electrical power.

2. Remove front panel.

3. Remove control box cover.

4. Locate ice chute, at the base of the chute, in
front of and behind it are two plastic bin control
mounts.

5. Slide each bin control to the left, and disconnect
the electrical leads connecting the bin control to
the circuit board.

6. Reverse to reassemble, be certain that the bin
controls are aligned so that the ice level sensors
are visible (centered) through the holes in the ice
chute.

May 2001

Page 24

NME954 & FME1204

REMOVAL AND REPLACEMENT: Bearing And Breaker

Note: Removal of the auger, water seal, evaporator
and gear motor must begin at the top of the
assembly.

1. Remove panels and disconnect electrical power.

6. Service the bearing. Check for rust, rough spots
and damage.

a. The bearing is pressed into the breaker, to
remove the bearing and replace it an arbor press is
needed.

b. Replace lower seals before installing new
bearing in breaker.

Electrical shock hazard.

Electrical shock can cause
personal injury.
Disconnect power before
beginning to service
components.

Note: seals must be pressed in with a tool pushing
against the outer edge only, they will not install by
hand.

Replace parts as required. Re-grease bearing with
Scotsman part no. A36808-001 bearing grease.
Replace top seal, and check the o-rings, replace if
cut or torn.

2. Push back bail clamp and remove ice chute
cover.

3. Unscrew and remove ice sweep.

4. Lift up and remove ice chute.

5. The breaker may be removed from the auger
and evaporator without disturbing the auger.

a. Unscrew breaker cover from breaker (left hand

7. Reverse to reassemble: specific tools and
materials are required to install properly.

a. Add food grade grease such as Scotsman part
number 19-0569-01 to the seal area before
installing on the auger.

b. Check the seal to shaft areas for cuts, or rough
spots: none are permitted.

threads)

b. Unscrew auger stud from top of auger.
c. Unscrew 4 allen head cap screws holding

breaker to evaporator.

d. Lift up, and remove breaker/bearing assembly

from auger & evaporator.

Step 5-a Step 5-b Step 5-c and Step 6

Note: Flaker parts are shown in this manual.

Nugget Breakers do NOT have a Slotted Collar.

Ice

Sweep

Breaker

Cover

Bearing

Seals

Slotted

Collar

Auger

Stud

May 2001

Page 25

NME954 & FME1204

REMOVAL AND REPLACEMENT: Auger

To Remove the Auger:

Turn off the water to the machine, and unclip the
evaporator drain hose, pull it down and drain the
evaporator into the bin or a container.

1. Remove the top panel.

Moving Parts Hazard.

Rotating parts can cause
personal injury.
Disconnect power before
beginning to service
components.

2. Swing bail clip down and remove ice chute
cover.

3. Unscrew ice sweep.

4. Remove ice chute body.

5. The auger and breaker/bearing may now be
removed as an assembly.

Breaker And

Auger

Assembly

a. Unscrew breaker cover from breaker (left hand
threads)

b. Unscrew auger stud from top of auger.
c. Unscrew 4 allen head cap screws holding

breaker to evaporator.
d. Lift up & remove breaker from evaporator.
e. If the auger is stuck use a slide hammer type

puller to pull on the auger at the threaded hole.
The size of that hole is 5/8"-18.

Inspect the auger, the critical areas of the auger
are:

1. The auger body. It should be clean and shining.
Sometimes an auger will appear clean when wet,
but after it is dry it will be seen to be stained.
Scrub the auger with ice machine cleaner and hot
water.

WARNING

Ice machine cleaner is an acid. Handle it with
extreme care, keep out of the reach of children.

2. The water seal area. Because the auger has
been removed, the water seal will have to be
replaced. Remove the water seal top half from the
auger, and inspect the auger for minerals, clean as
required.

The auger has sharp

edges, handle with care.

a. Unscrew 4 allen head cap screws holding
breaker to evaporator.

b. Lift up on breaker and remove auger from
evaporator.

Note: If the auger is stuck, the breaker must be
removed from the auger.

The breaker may be removed from the auger and
evaporator without disturbing the auger.

May 2001

WARNING

SLIDE Hammer

PULLER

Thread Into The

Auger Here

Page 26

NME954 & FME1204

REMOVAL AND REPLACEMENT: Water Seal

To Remove the Water Seal:

(Assuming all steps to remove the auger have
been performed.)

1. The gear motor/evaporator assembly will have
to be exposed.

2. Remove the 4 hex head cap screws holding the
evaporator to the gear motor assembly. Lift the
evaporator up and off of the gear motor.

3. Remove the snap ring or wire retainer from the
grove under the water seal.

4. Pull or drive out the lower half of the water seal.

REMOVAL OF THE WATER SEAL

To Replace the Water Seal:

1. Lubricate the water seal with water, and push
the water seal into the bottom of the evaporator
slightly past the grove for the snap ring.

2. Replace the snap ring and pull the water seal
down against it.

3. The part of the water seal that rotates with the
auger must also be replaced. Remove the old part
from the auger and clean the mounting area.

4. Place a small bead of food grade silastic sealant
(such as 732 RTV or Scotsman part number
19-0529-01) on the area of the auger where the
water seal is to be mounted.

REPLACING THE

WATER SEAL

Water Seal

Retaining Ring

Place Food Grade

Sealant Here

5. Carefully push the water seal (rubber side
against the auger shoulder and the silastic.)

CAUTION

Do not get any silastic onto the face of the seal.

6. Allow the auger and seal to air dry until the
silastic is dry on the surface.

7. If the original water seal was leaking, it would be
a good idea to inspect the interior of the gear
motor.

May 2001

Page 27

NME954 & FME1204

REMOVAL AND REPLACEMENT: Evaporator

To Replace the Evaporator:

(Assuming all the steps for removal of the thrust
bearing, breaker, auger, and water seal have been
performed.)

1. Recover the refrigerant from the Ice Machine.

2. Unsweat the refrigerant connections:

CAUTION

Heat sink the TXV body when unsweating or
resweating the adjacent tubing.

At the thermostatic expansion

·

valve outlet.

At the suction line at the joint

·

about 3" from the evaporator.

3. Remove the evaporator.

4. Unsweat the drier from the liquid line.

5. After installing a new water seal in the new
evaporator (see “To Replace the Water Seal”)
sweat in the new evaporator at the old tubing
connections.

6. Install an new drier in the liquid line.

7. Evacuate the system until dehydrated, then
weigh in the nameplate charge. Check for leaks.

8. Install auger, breaker, breaker bearing
assembly, and ice discharge chute in reverse order
of disassembly.

To Reassemble the Evaporator and Auger

1. After the gear motor has been inspected, fasten
the evaporator to the gear motor. Torque the bolts
to 110 inch pounds.

2. Lower the auger into the evaporator barrel,
slightly turning it to match up with the drive end. Do
Not Drop Into the Evaporator.

3. Complete the reassembly by reversing the
disassembly for the breaker & thrust bearing
assembly.

Ice Chute

Bearing

Breaker/Divider

Ice Sweep

Auger

Evaporator

May 2001

Page 28

NME954 & FME1204

REMOVAL AND REPLACEMENT: Gearmotor

To Inspect the gear motor.

A) Remove the cap screws holding the gear motor

Electrical shock hazard.

Electrical shock can cause
personal injury.
Disconnect power before
beginning to service
components.

To Check the Motor:

1. Remove wires from terminals 1 and 2.

2. Use an ohmmeter to check for continuity. If there
is none, replace the motor only. If there is
continuity but the motor will not start, check the
motor's start switch.

3. Remove motor end bell or motor stator. With
ohmmeter wires attached to 1 and 2 move
centrifugal switch actuator up and down to simulate
motor rotation. If the ohmmeter does not show any
change, replace the switch
or motor. If the ohmmeter
shows an open circuit,
replace the switch or
motor.

To Remove and Repair

Water Shed

the Gear motor
Assembly:

(Assuming that the

Cover & Output
Gear Assembly

procedures through
removal of the water seal
have been performed.)

1. Remove the electrical
wires from the gear drive
motor.

2. Unscrew the 4 cap
screws holding the gear
motor to the base of the
machine.

3. Remove the gear motor
from the Ice Machine.

Bench test the gear motor,
check for oil leaks, noise,
and amp draw.

case halves together and pry the two cases apart.
B) To lift off the cover, lift up until you can feel

internal contact, then pull the cover towards the
output gear end, and then lift the cover (with drive
motor attached) up and away from the gear motor
case.

Note: The gearcase cover, output gear,
bearings and output shaft are a pressed
together assembly.

C) Inspect the oil gears and bearings. If there is
evidence of water in the oil (rusty metal, too much
oil, white oil) replace the oil and damaged parts.
The oil charge is 14 oz. Do not overfill.

Reassemble and bench test the gear motor, check
for oil leaks, noise, and amp draw.

Centrifugal

Switch

Auger Drive Motor

Rotor Bearing

May 2001

Page 29

NME954 & FME1204

REMOVAL AND REPLACEMENT: Fan Blade and Motor

Electrical shock hazard.

Electrical shock can cause
personal injury.
Disconnect power before
beginning to service
components.

To Remove the Condenser Fan Motor
Assembly

1. Remove top panel and the two service panels.

2. Unplug the two fan motor wire leads from the fan
motors.

3. Remove the two hex head bolts from the top end
of the fan motor assembly.

4. Lift up the fan motors and bracket assembly about
½" and pull out the fan motor assembly out the right

service access hole.

5. Repair as needed.

6. To reassemble: Place the fan motor assembly
lower flange holes over the two allen head cap
screws in the base, and reinstall the hex head bolts
at the top of the assembly. Plug the fan motors back
in, and replace the top panel.

May 2001

Page 30

REFRIGERATION SYSTEM SERVICE

SCALE

NME954 & FME1204

General: This ice machine uses R-404A refrigerant
and polyolester oil. Do NOT use mineral oil in this
refrigeration system.

When the system is serviced, a special liquid

·

line drier is required. It is included with
replacement compressors.

R-404A is not compatible with mineral oil so

·

these ice machines use Polyolester oil.
Polyolester oil absorbs water very easily. A
system opened for service must be re-sealed as
soon as possible (15 minutes maximum).

Special leak detection equipment is required to

·

locate small refrigerant leaks. Usually a leak
detector capable of detecting a Halongenated
refrigerant or HFC-134a will work. Check with
the leak detector manufacturer if in doubt.

Evacuate to 300 microns.

·

Liquid charge the system

·

Access Valves: To use the
access valves:

Remove the cap from the

·

stem, use a 3/16" allen
wrench to check that the
valve is CLOSED. The
remove the core cap.

·

Close the valve and
replace the caps when
done. The
valve must be closed and
the caps

Sight Glass

Torque stem

to 6-8 ft.-lb.,
caps to 7-12

ft.-lb.

R-404A
Tank Must
Be in Liquid
Dispensing
Position ­Check Tank!

Instructions for Liquid Charging R-404A

In preparation for charging, the low side hose
should have a sight glass, and/or a restricting
device (such as a “Charge Faster”) installed in it for
metering liquid into the low side of the system.

1. After a thorough evacuation shut off the manifold
valves and switch off the vacuum pump.

2. Place a drum of R-404A onto an electronic
scale.

3. Attach the charging hose to the drum.

4. Open the valve on the drum and purge the
charging hose.

5. Zero out the scale.

6. Shut the low side access valve at the ice
machine.

7. Open the discharge manifold valve full open.

8. Watch the scale, when the correct charge is
shown, shut the manifold valve.

Note: If all of the charge will not “go in” the
discharge side:

A. Shut the discharge access valve at the ice
machine.

B. Switch the machine on.
C. Open the low side access valve at the ice

machine.
D. Open the low side manifold valve and observe

the sight glass to be certain that only gas is flowing
into the system.

E. When the proper charge is indicated on the

scale, shut off the manifold valve(s).

9. Shut off the valve on the refrigerant drum.

10. Re-open the manifold valves until all liquid
has flowed out of the hoses.

11. Shut the low side access valve on the ice
machine.

12. Remove hoses from ice machine and replace
all caps.

Hose Connection Schematic for Liquid Charging

May 2001

Page 31

NME954 & FME1204

What to Do Before Calling for Service

If the machine is off, not making ice:

1. Check the water supply to the ice
machine. The machine is designed to
shut off if there is no water to it. Check
the filters if there are any.

2. Check the power supply to the
machine. Reset the breaker if it is
tripped.

3. If both water and power have been
checked and are available, try switching
the power Off and then On. After 2
minutes the machine should restart.

If this procedure restarts the machine,
service should be called the next time
the machine stops.

May 2001

Page 32