Scotsman NME950 Service Manual

INTRODUCTION

NME950 & FME1200

Page 1

To the owner or user: The service manual you are
reading 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 machine is a modular ice system that fits a
variety of Scotsman ice storage bins.

It features: 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

SAMPLE BIN AND MACHINE COMBINATIONS . . . . . . . . . . . . . . . . . . . . . . Page 3

FOR THE INSTALLER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 4

FOR THE PLUMBER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 6

FOR THE ELECTRICIAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 7

START UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 9

COMPONENT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 10

COMPONENT DESCRIPTION: Control Box . . . . . . . . . . . . . . . . . . . . . . . . Page 11

ELECTRICAL SEQUENCE: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 13

OPERATION: Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 14

OPERATION: Refrigeration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 15

OPERATION: Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 15

SANITIZING AND CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 16

MAINTENANCE AND CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 17

MAINTENANCE: Air Cooled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 18

MAINTENANCE AND CLEANING: Auger . . . . . . . . . . . . . . . . . . . . . . . . . Page 19

SERVICE DIAGNOSIS: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 20

REMOVAL AND REPLACEMENT: Water Reservoir & Bin Controls . . . . . . . . . . . . Page 22

REMOVAL AND REPLACEMENT: Bearing And Breaker . . . . . . . . . . . . . . . . . . Page 23

REMOVAL AND REPLACEMENT: Auger . . . . . . . . . . . . . . . . . . . . . . . . . Page 24

REMOVAL AND REPLACEMENT: Water Seal . . . . . . . . . . . . . . . . . . . . . . . Page 25

REMOVAL AND REPLACEMENT: Evaporator . . . . . . . . . . . . . . . . . . . . . . . Page 26

REMOVAL AND REPLACEMENT: Gearmotor . . . . . . . . . . . . . . . . . . . . . . . Page 27

REMOVAL AND REPLACEMENT: Fans . . . . . . . . . . . . . . . . . . . . . . . . . . Page 28

REFRIGERATION SYSTEM SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 29

LIQUID CHARGING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 30

CIRCUIT BOARD TESTING: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 31

Parts lists and wiring diagrams are in the center of this manual, printed on yellow paper.

This manual was printed on recycled paper.

Keep it for future reference.

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

January 1995

FOR THE INSTALLER

NME950 & FME1200

Page 2

BACK VIEW: AIR COOLED

WATER INLET

3/8" FLARE

DRAIN

3/4" FPT

Note: Allow 6"

behind and 6"

above either unit

for air circulation,

utility connections,

and service.

ELECTRICAL

INLET

9.5"

5.25"

3"

Condenser Inlet 3/8" FPT

2.1"

5.7"

Condenser Drain 1/2" FPT

BACK VIEW: WATER COOLED

2.9"

3.4"

DRAIN

3/4" FPT

4.9"

7.46"

ELECTRICAL

WATER

INLET

5.25"

3"

INLET

7.3"

9.43"

This machine is designed to fit the following
Scotsman storage bins:

B90 and extensions (with bin top KBT18)
BH800 using bin top KBT15 (one unit).
BH800 (two units, no bin top required).
BH900 with KBT24 (one unit)
BH900 with KBT25 (two units side by side)

When installing a new system, check to be sure
that everything is on site before beginning:

Correct Bin
Correct Ice Machine
Correct Bin Top (if required)
All kits, legs, and information required for
the specific job.

SPECIFICATIONS : ICE MAKER

Model Number

FME1200AE-3A

FME1200WE-3A

FME1200AE-32A

FME1200WE-32A

NME950AE-3A

NME950WE-3A
NME950AE-32A
NME950WE-32A

Dimensions

(w/o bin)

W x D x H

21" x 24" x 27"

same
same
same
same
same
same
same

Basic

Electrical

208-230/60/3

same

208-230/60/1

same

208-230/60/3

same

208-230/60/1

same

Installation Limitations:

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

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

Voltage -5% +10%
(Compared to the nameplate)
Operating the machine outside of the limitations is

misuse and can void the warranty.
The normal finish for the ice machine is

enamel-sandalwood. A stainless steel panel kit,
SPKFM21 may be field installed to convert the unit
to a stainless steel finish.

Ice Type

FLAKE

same
same
same

Nugget

same
same
same

January 1995

Condenser

Type

Air

Water

Air

Water

Air

Water

Air

Water

Min Max

0

F 1000F

0

F 1000F

Refrigerant Charge*
Air Cooled 30 oz

R-404A
Water
Cooled

* Always go by the
nameplate charge.

Note: 50 Hz (-6) models have

also been produced.

24 oz

R-404A

SAMPLE BIN AND MACHINE COMBINATIONS

NME950 & FME1200

Page 3

Air Flow on

All Air

Cooled

Models is In

the Front

and Out the

Back

The Nameplate is

located on the back

of the machine.

FME1200 ON BH550*

NME950 ON BH800*

FME1200 ON BH900*

* Bin Top Kit Required

January 1995

FOR THE INSTALLER

NME950 & FME1200

Page 4

Typical Storage Bin with Extension and Bin Top

Location:

After uncrating and inspection, the unit is ready for
installation. It is important that the machine be
installed in a location where it has enough space
around it to be accessible for service, and
minimum of 6" be allowed at the back for air
circulation on air cooled models. Try to avoid hot,
dirty and crowded locations. Be sure that the
location for the machine is within the
environmental limitations.

Storage Bin:

Tip the storage bin on its back, using parts of the
carton to protect the exterior finish. 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, but 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.

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.

Ice Maker:

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.

January 1995

FOR THE INSTALLER: Location

NME950 & FME1200

Page 5

TWO UNITS ON ONE BIN

ALLOW ROOM

FOR AIR
CIRCULATION
AND SERVICE

ACCESS

DO NOT STACK ANYTHING IN

FRONT OF THE MACHINE(S)

January 1995

FOR THE PLUMBER

NME950 & FME1200

Page 6

CONFORM TO ALL APPLICABLE CODES

Water Inlet

Air Cooled Models: The recommended water

supply is clean, cold water. Use 3/8" O.D. copper
tubing, connect to the 3/8" male flare at the back of
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 3/8" O.D.
copper line is recommended, with a separate hand
valve to control it. It is connected to a 3/8" FPT
condenser inlet at the back of the cabinet. The
water pressure to all lines must always be above
20 psig, and below 80 psig.

WATER

COOLED

CONDENSER

INLET

Drains

Air Cooled Models: There is one 3/4" FPT drain

at the back of the cabinet, the drain line is of the
gravity type, and 1/4 inch per foot fall is an
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 only 3/4" rigid tubing.

Water Cooled Models : In addition to the above
mentioned drain, a separate condenser drain must
be installed. Connect it to the 1/2" condenser
drain connection at the back of the cabinet.

Storage Bin : A separate gravity type drain needs
to be run, similar to the air cooled drain. Insulation
of this drain line is recommended.

AIR COOLED

MODELS

FIELD

SUPPLIED

FILTER

HAND

VALVE

WATER

FILTER

CONDENSER

DRAIN

VENTED

DRAIN

HAND

VALVE

VENTED

DRAIN

WATER

INLET

January 1995

FOR THE ELECTRICIAN

NME950 & FME1200

Page 7

CONFORM TO ALL APPLICABLE CODES

The electrical power to the unit is supplied through
the junction box at the rear of the machine.

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.

WATER COOLED

The ice maker should be connected to its own
electrical circuit so it would be individually fused.
Voltage variation must remain within design
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

January 1995

FOR THE INSTALLER

NME950 & FME1200

Page 8

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?

January 1995

START UP

NME950 & FME1200

Page 9

Pre-Start Inspection

1. Remove the front and side service panels.

2. Check that the styrofoam shipping blocks have
been removed.

Start Up

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 switch on.
The electrical start up sequence is now on

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.

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 blade
turns freely (air cooled).

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

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.

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.

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 manufacturers registration card, and
mail it to the Scotsman Factory.

10. Fill out the warranty registration form, and mail
it to Scotsman.

January 1995

COMPONENT DESCRIPTION

NME950 & FME1200

Page 10

Control Box: Contains the electrical controls that

operate the machine.
High Pressure Cut Out Switch : A manual reset

switch sensing the high side refrigeration pressure.
It is set to shut the machine off if the discharge
pressure should ever exceed 450 psig.

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.

AIR COOLED

Hi Pressure

Cut Out

CONTROL BOX

RESERVOIR

CONDENSER

EXPANSION

VALVE

DRAIN

TUBE

ICE CHUTE

COMPRESSOR

January 1995

ICE LEVEL

SENSORS

COMPONENT DESCRIPTION: Control Box

NME950 & FME1200

Page 11

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.

Transformer: Supplies low voltage to the circuit
board.

Control Box

LOW

PRESSURE

CUT OUT

SWITCH

POTENTIAL

RELAY

Low Pressure Cut Out Switch: A manual reset

control that shuts off the ice machine when the low
side pressure drops below a preset point, 0-4 psig.

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

ON/OFF SWITCH

TRANSFORMER

CIRCUIT

BOARD

CONTACTOR

"No Water " light,
glows when there is
not enough water in

the reservoir

"Bin Empty" light,

glows when ice level is

below electric eyes.

January 1995

COMPONENT DESCRIPTION

NME950 & FME1200

Page 12

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

MOTOR

January 1995

ELECTRICAL SEQUENCE:

NME950 & FME1200

Page 13

Refer the wiring diagram as needed.

If the machine is switched off at the master switch,
but is otherwise ready to go, switching the master
switch to on does the following:

••The bin empty light on the circuit board goes on

••There is a 15 second delay

••If there is enough water in the reservoir, the

circuit board will allow the machine to start up.

Start up consists of:

••The compressor relay and auger motor relay

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

••The auger motor starts, and the centrifugal

switch closes, connecting power to the
compressor contactor coil.

••The contactor is energized, connecting power

to the compressor, and the compressor starts.

••As ice goes past the ice level sensors, the bin

empty light will stay on, and the machine will
continue to run, unless the ice stays between
the sensors for more than 15 seconds (bin full).
At that point, the bin empty light goes out, and
the machine shuts down.

Shut Down consists of:

••The compressor relay opens.

••The compressor contactor opens

••The compressor stops

••The auger motor is run by the circuit board for 2

more minutes, clearing out ice in the
evaporator, and then

••The auger motor relay opens, and the auger

motor stops.

If the ice level sensor is clear (bin empty) for more
than 15 seconds, the machine will start up again.

Another purpose of the circuit board is to turn the
machine off if there is not enough water in the
machine.

••When the water level in the reservoir falls

below the water level sensor, the machine will
"shut down"

••When the water refills the reservoir, the

machine will start up again.

Separate from the circuit board:

••If the high pressure control (cut out switch)

opens, the machine will stop immediately
(through the relays on the circuit board). it is a
manual reset.

••If the low pressure control (cut out switch)

opens, the machine will stop immediately
(through the relays on the circuit board). It is a
manual reset.

••The master switch is the manual control for the

complete machine, but it is not a service
disconnect.

January 1995

OPERATION: Water

NME950 & FME1200

Page 14

Water enters the machine through the 3/8" male
flare at the rear of the cabinet, goes to a strainer
and then 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.

WATER INLET

RESERVOIR

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

STRAINER

ICE

CHUTE

EVAPORATOR

EVAPORATOR

EVAPORATOR INLET

DRAIN

WATER SCHEMATIC

January 1995

OPERATION: Refrigeration

NME950 & FME1200

Page 15

Beginning at the compressor, the refrigerant is
compressed into a high temperature gas. The
discharge line directs this gas to the condenser.
At the condenser (air or water cooled) the gas is
cooled by either air or water and it then condenses
into a liquid. This high pressure liquid then goes
through the liquid line to the expansion valve.

The thermostatic expansion valve meters liquid
refrigerant into the evaporator, the volume of liquid
refrigerant depending upon the temperature of the

CONDENSER

LIQUID

LINE

FAN

MOTOR

DISCHARGE

evaporator; warmer evaporators get more
refrigerant and colder evaporators get less.

At the evaporator, the refrigerant enters an area of
relatively low pressure, where it can easily "boil
off" or evaporate. As it evaporates, it absorbs heat
from the evaporator and whatever is in contact
with it (such as the water inside it). After the
evaporator, the refrigerant, now a low pressure
vapor, goes through the suction line back to
compressor, where the cycle is repeated.

Refrigeration Schematic

SUCTION LINE

LINE

EVAPORATOR

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

•• 450 PSIG

THERMOSTATIC

EXPANSION

VALVE

COMPRESSOR

Low Pressure Cut Out

•• 0 - 4 PSIG

Refrigerant Charge

•• Air Cooled: 30 ounces HP62

•• Water Cooled: 24 ounces of HP62.

GEAR

MOTOR

January 1995

NME950 & FME1200

SANITIZING AND CLEANING

A Scotsman Ice Syst em rep resents a sizable inves tment of time and money in any company’s busine ss. In
order to receive th e best retu rn for t hat inve st men t, it MUST re ceiv e period ic maint en ance .

It is the USER’S RESP ONS IB ILITY to see that the unit is properly maint ain ed. It is always preferable, and
less costly in th e lon g run, to avoid possible down time by keep ing it clea n; adju stin g it as nee ded; and by
replacing worn parts be fore th ey can cause failu re. The follo wing is a list of recomme nd ed maintenance
that will help keep the machin e run nin g with a minimum of prob lems .

Maintenance and Clea ning should be schedule d at a minimum of twice per year.

ICE MAKING SYSTEM: In place cleaning

1. Check and clean any wat er tre at men t device s,
if any are insta lled .

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

3. Move the ON-OFF switch to OFF.

4. Remove all the ice from the stora ge bin.

5. Remove the cover to the wat er rese rvo ir and
block the float up.

6. Drain the water reservoir and freezer ass emb ly
using the drain tube attached to the freezer water
inlet. Return the drain tub e to its normal up righ t
position and replace the end cap.

7. Prepare the cleaning solution: Mix eight
ounces of Scotsman Ice Machine Cle aner with
three quarts of hot water. The water should be
betw e en 90-115 deg r e e s 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.

12. Go thru ste ps 13 -18 to sa nit ize th e ice machin e
water syste m.

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

A possible sanit izer so lut ion may be obtaine d by
mixing two gallons of warm (90-1 15

o

F.) potable

water with 1 ounce of household bleach.

14. Slowly pour the sanitiz er solu tion into the water
reservoir until t he floa t rise s, then switch the
master switch ON.

15. As the ice machine uses water from the
reservoir, co nt inu e to pour t he sanit izer solution
into the reservo ir.

16. After

1

⁄2 of the sanitizer solut ion has been

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

17. Drain the reservoir and thoro ughly wash the
interior of the res ervo ir and cover wit h sanit izer
solution.

18. Remove the block from the flo at in the wate r
reservoir.

19. Switch the master switch to ON

20. Continue ice makin g for at lea st 15 minu tes, to
flush out any cleaning solution . Switch the mast er
switch OFF.

DO NOT USE any ice produced from the
cleaning solution.

Be sure no ice remains in the bin.

8. Slowly pour the cleanin g so lut ion into the wate r
reservoir until it is full. Wait 15 minutes, then
switch the master switch to ON.

9. As the ice maker begins to use water from the
reservoir, co nt inu e to add more cleaning solut ion
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 swit ch to OFF.

11. After draining the rese rvoir, as in ste p 6, wash
and rinse the water reservo ir.

21. Remove all ice from the stora ge bin.

22. Add warm water to the ice storage bin and
thoroughly wash and rins e all surfac es with in th e
bin.

23. Sanitize the bin int erio r by tho rou gh ly wash ing
the interior of th e bin and bin door with the bala nc e
of the sanitizer solution.

24. Switch the master switch ON.

25. Replac e the pane l s .

January 1996

Page 16

MAINTENANCE AND CLEANING

NME950 & FME1200

Page 17

A. Check the bearing by:

••removing the ice chute cover

Electrical shock hazard.

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

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.

2. The ice machine senses water level by a probe
located in the water reservoir. At least twice a
year, the probe should be removed from the
reservoir, and the tip wiped clean of mineral
build-up.

PULL UP TO

REMOVE PROBE

RESERVOIR

••unscrewing the ice sweep

••removing the water shed

••unscrewing the breaker cover.

••unscrewing the auger stud

Inspect the assembly, looking for wear.

ICE LEVEL SENSORS:

SLIDE TO REMOVE

CLEAN THE

LIGHT SENSORS

CLEAN THE

WATER LEVEL

PROBE

///////////////////////////////////////////

CAUTION: THE TIP IS

MADE OF GLASS

//////////////////////////////////////////

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

See Removal and Replacement to replace
bearing or seals. Reverse to reassemble.

4. Check and tighten all bolts and screws.

ICE SWEEP

BREAKER

COVER

January 1995

MAINTENANCE: Air Cooled

NME950 & FME1200

Page 18

Electrical shock hazard.

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

5. Clean the air cooled condenser.

TO GAIN ACCESS TO CONDENSER SURFACE:

1. REMOVE TOP PANEL

The 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.

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.

3. PULL FAN MOTOR ASSEMBLY UP AND OUT

2. REMOVE TWO SCREWS & UNPLUG FAN MOTORS.

4. CLEAN CONDENSER FINS.

January 1995

MAINTENANCE AND CLEANING: Auger

NME950 & FME1200

Page 19

In some areas, the water supply to the ice maker
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.

Electrical shock hazard.

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

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.

The auger has sharp

edges, handle with care.

4. Loosen band clamp under ice chute, and
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.

ALLEN

SCREWS

BREAKER &

BEARING &

AUGER

ASSEMBLY

January 1995

SERVICE DIAGNOSIS:

NME950 & FME1200

Page 20

Symptom Possible Cause Probable Correction

No ice is made, nothing
operates

No ice, auger motor is turning Compressor contactor coil is

Unit makes ice, but very slowly. High discharge pressure

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,

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 does not turn. Winding open, bearings

Low pressure control open Check that auger turns

Centrifugal switch in auger
motor does not close.

No power to circuit board,
transformer is open.

Circuit Board gear motor relay
will not close

Water level or ice level sensor
failed.

open
Compressor will not start Check start capacitor.

Circuit board compressor relay
will not close.

because of a dirty condenser
Low capacity because the

auger and evaporator are
coated with mineral scale
Low suction pressure due to
low refrigerant charge

Switch master switch to ON.

strainer, 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).

seized. Check/replace auger
motor.

Check charge.
Check for a restricted system
Check/replace centrifugal

switch.
Replace transformer.

Check, replace board
Check, replace sensor
Check/replace contactor

Check start relay
Check compressor windings
Check, replace board

Clean the air filter and
condenser.
Clean the water system

Locate leak. Recover
refrigerant, repair leak, replace
dryer, evacuate and weigh in
the nameplate charge

January 1995

SERVICE DIAGNOSIS

NME950 & FME1200

Page 21

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

January 1995

REMOVAL AND REPLACEMENT: Water Reservoir & Bin Controls

NME950 & FME1200

Page 22

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

PLUNGER

/SEAT

LOCKING

TABS

SLIDE BIN

CONTROLS IN

AND OUT

ICE

CHUTE

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 in the
control box, 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.

January 1995

REMOVAL AND REPLACEMENT: Bearing And Breaker

NME950 & FME1200

Page 23

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.

Electrical shock hazard.

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

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

3. Unscrew and remove ice sweep.

4. Remove insulation halves from outside of ice
chute, loosen band clamp under ice chute, 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
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.

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.

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. A29123-001 bearing grease.
Replace top seal, and check the o-rings, replace if
cut or torn.

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.

Note: Flaker parts are shown in this manual.

Nugget Breakers do NOT have a Slotted Collar.

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

BEARING

ICE

SWEEP

AUGER

STUD

BREAKER

COVER

SEALS

SLOTTED

COLLAR

January 1995

REMOVAL AND REPLACEMENT: Auger

NME950 & FME1200

Page 24

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. The top panel must be removed.

Electrical shock hazard.

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

2. Remove ice chute cover.

3. Unscrew ice sweep.

4. Loosen band clamp and remove ice chute body.

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

a. Unscrew 4 allen head cap screws holding

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.

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.

WARNING

SLIDE HAMMER

PULLER

THREAD INTO THE

AUGER HERE

January 1995

REMOVAL AND REPLACEMENT: Water Seal

NME950 & FME1200

Page 25

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.

January 1995

REMOVAL AND REPLACEMENT: Evaporator

NME950 & FME1200

Page 26

To Reassemble the Evaporator and Auger

1. After the gear motor has been inspected, fasten

Electrical shock hazard.

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

To Replace the Evaporator:

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

1. Discharge the refrigerant from the ice maker.

2. Unsweat the refrigerant connections:
a) At the thermostatic expansion valve outlet.

CAUTION

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

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 SWEEP

b) 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.

AUGER

EVAPORATOR

ICE CHUTE

BEARING

BREAKER/DIVIDER

January 1995

NME950 & FME1200

REMOVAL AND REPLACEMENT: Gearmotor

To Inspect the gear motor.

A) Remove the cap screws holding the gear motor
case halves together and pry the two cases apart.

Electrical shock hazard.

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

To Remove and Repair the Gear motor
Assembly:

(Assuming that the 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 maker.

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

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.

WATER SHED

CENTRIFUGAL

SWITCH

COVER &

OUTPUT GEAR

ASSEMBLY

AUGER DRIVE MOTOR

ROTOR BEARING

SEAL

January 1995

Page 27

REMOVAL AND REPLACEMENT: Fans

NME950 & FME1200

Page 28

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.

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 and pull out the fan motor assembly.

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.

January 1995

REFRIGERATION SYSTEM SERVICE

NME950 & FME1200

Page 29

General:

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

••R-404A is a "Near Azeotrope" so liquid charging is required:

••When the system is serviced, a special liquid line drier is required. It is

included with replacement compressors.

••HP62 is not compatible with mineral oil, so these ice machines use

Polyolester oil. Polyolester oil absorbs water very easily. When one of
these refrigeration systems is opened for service, it 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.

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 the job is finished.

The valve must be closed and the caps must be on or the valve
will leak.

ALLEN

WRENCH
Torque to

6-8 ft. lb..

Cap, Torque

to 8-12 ft. lb..

ACCESS VALVE

Cap, Torque

to 7-11 ft. lb..

Pressure-Temperature Chart for HP62

VAPOR VAPOR
TEMP. PRESS. TEMP. PRESS.
(DEG F) (PSIG) DEG F) (PSIG)

-20 17 70 146

-18 18 72 150

-16 20 74 155

-14 21 76 161

-12 23 78 166

-10 24 80 171

-8 26 82 177

-6 28 84 182

-4 29 86 188

-2 31 88 194
0 33 90 200
2 35 92 206
4 37 94 212
6 39 96 219
8 41 98 225
10 43 100 232
12 46 102 239
14 48 104 246
16 50 106 253
18 53 108 260
20 55 110 268
22 58 112 275
24 60 114 283
26 63 116 291
28 66 118 299
30 69 120 307
32 72 122 316
34 75 124 324
36 78 126 333
38 81 128 342
40 85 130 351
42 88 132 360
44 91 134 370
46 95 136 379
48 99 138 389
50 102 140 399
52 106 142 409
54 110 144 420
56 114 146 430
58 118 148 441
60 123 150 452
62 127 152 464
64 132 154 475
66 136 156 487
68 141 158 499

January 1995

LIQUID CHARGING

NME950 & FME1200

Page 30

Instructions for R-404A

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

1. After a thorough evacuation to at least 200
microns, 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.

Manifold Valve

Sight Glass

Low Side
Access Valve

High Side
Access Valve

Hose Connection Schematic for Liquid Charging

Manifold Valve

Refrigerant Drum Valve

SCALE

January 1995

CIRCUIT BOARD TESTING:

NME950 & FME1200

Page 31

These procedures require the machine to be connected to the power supply. The voltages of the
electronic circuit are very low, but HIGHER VOLTAGES ARE PRESENT IN THE UNIT. Do not touch
anything but the tester while the unit is being checked out. Make all connections to the circuit board with
the ELECTRICAL POWER OFF.

INSTRUCTIONS FOR USING TESTER (Optional, order part no. A33942-001)

(These instructions assume that the unit will not run, and prior investigation of electric power, controls,
and mechanical parts indicates that the electronic circuit may be at fault.)

If the "Reset" indicator (located in the "reset" switch) is off and the "NO WATER" indicator is lit, but
inspection shows that the water level in the reservoir is above the top of the water level sensor, OR the
"BIN EMPTY" indicator is off while inspection shows that the ice level sensors are properly aligned, clean
and not obstructed, use the tester as follows:

Bin Control Note: All testing is done with the
electrical power on, the master switch on, and all
reset switches ‘‘reset’’.

1. Unplug ‘‘photo trans’’ and ‘‘LED’’ connectors from
the circuit board.

2. Plug ‘‘photo trans’’ and ‘‘LED’’ connectors from
the tester into the circuit board.

a. Move the ‘‘bin full’’ switch on the tester to Full.
The light on the tester should be ON.

If the light on the tester is not on, the circuit board
should be replaced.

b. If the light on the tester IS on, move the ‘‘bin
full’’ switch to Bin Empty. The light on the tester
should go OFF, and the Bin Empty light on the
circuit board should go ON.

If the Bin Empty light is ON, wait 10-20 seconds for
the machine to start, if the machine starts, replace
the ice level sensors.
If the Bin Empty light does not come ON, the
circuit board should be replaced.

PHOTO TRANS

SWITCH TO

‘‘FULL’’

LED

LIGHT GOES

ON

January 1995

LIGHT GOES

ON

LIGHT

GOES OFF

SWITCH TO

‘‘BIN EMPTY ’’

CIRCUIT BOARD TESTING:

NME950 & FME1200

Page 32

Water Level

1. Unplug ‘‘water sen’’ connector from control
board.

2. Plug ‘‘water sen’’ connector from Scotsman
tester into circuit board.

a. Move ‘‘water’’ switch on tester to No Water
position. The No Water light on the circuit board
should go ON. If not, replace the circuit board.

LIGHT ON

b. Move the ‘‘water’’ switch on the tester to the
Water position. The No Water light on the board
should go OFF. If not replace the circuit board. If
the light does go off, replace the water level sensor.

If the Bin Empty light is ON, wait 10-20 seconds for
the machine to start. The machine should start.

LIGHT OFF

SWITCH TO

‘‘NO WATER’’

WATER SENS

SWITCH TO

‘‘WATER’’

January 1995