Scotsman FME2400 Owner’s Manual

INTRODUCTION

NME1850 & FME2400

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 product contains 2 separate ice making
systems in one cabinet.

TABLE OF CONTENTS

Installation

For the Installer

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Storage Bin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

For the Plumber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

For the Electrician . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Final Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Component Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Electrical Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Maintenance and Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Service Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Removal and Replacement

Reservoir and Bin Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Bearing and Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Water Seal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Evaporator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Gear motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Fan Motor Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Refrigeration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Electronic Tester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

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 1994

FOR THE INSTALLER

NME1850 & FME2400

Page 2

The FME2400 and the
NME1850 are designed to fit
the following Scotsman storage
bins:

B90 and extensions

(with bin top KBT18)

BH800 no bin top required.
BH900 using bin top KBT14.
BH1360, no bin top required.

When installing a new system,
check to be sure that you have
everything you need before
beginning:

Correct Bin
Correct Ice Machine
Correct Bin Top (if required)

All kits, legs, and information

required for the specific job.

Note: Allow 6" behind and

6" above the unit for air

circulation, utility

connections, and service.

BACK VIEW

Condenser Inlet (W/C):

3/8" FPT

5.25"

9.5"
3"

TOP VIEW

Ice Chute

2.64" x 6.2"

14.9"

15.8"

18.74"

18.9"

Electrical Inlet

Water Inlet 3/8" Flare

Drain 3/4" FPT

Condenser Drain (W/C):

1/2" FPT

6"

18.28"

The normal finish for the ice
machine is
enamel-sandalwood. A
stainless steel panel kit,

SPECIFICATIONS : ICE MAKER

Model Dimensions

(w/o Bin)

Basic
Electrical

Ice Type Condenser

Type

W x D x H
FME2400AE-32A 42" x 24" x 27" 208-320/60/1 Flake Air
FME2400WE-32A 42" x 24" x 27" 208-320/60/1 Flake Water
FME2400AE-3A 42" x 24" x 27" 208-230/60/3 Flake Air
FME2400WE-3A 42" x 24" x 27" 208-230/60/3 Flake Water
NME1850AE-32A 42" x 24" x 27" 208-320/60/1 Nugget Air
NME1850WE-32A 42" x 24" x 27" 208-320/60/1 Nugget Water
NME1850AE-3A 42" x 24" x 27" 208-230/60/3 Nugget Air
NME1850WE-3A 42" x 24" x 27" 208-230/60/3 Nugget Water

34.84"

13.84"

Refrigerant Charge*
Air Cooled 30 oz.

R-404A

Water
Cooled

* Per system. Always go
by the nameplate.

24 oz.
R-404A

January 1994

FOR THE INSTALLER: Environmental Limitations

NME1850 & FME2400

Page 3

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 -5% +10%
(Compared to the nameplate)

Operating the machine outside of the limitations is
misuse and can void the warranty.

Water Limitations:

An ice machine is a food manufacturing plant; it
takes a raw material, water, and turns it into a food
product, ice. The purity of the water is very
important in obtaining pure ice and in maximizing
product life. This is not intended as a complete
resource for water related questions, but it does
offer these general recommendations:

1. Check with a water treatment specialist for a
water test, and recommendations regarding filters
and treatment.

2. In most cases, the water used to make ice
should be filtered or treated, depending upon the
water. There is no one type of water filter that will
be effective in all situations. That is why a water
test is important.

0

F 1000F

0

F 1000F

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.

1.25"

January 1994

Typical Storage Bin - B90

21.12"

Drain

3/4"
FPT

FOR THE INSTALLER

NME1850 & FME2400

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 limitations
described on page 3.

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.

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 1994

FOR THE INSTALLER: Location

NME1850 & FME2400

Page 5

ALLOW ROOM

FOR AIR
CIRCULATION
AND SERVICE

ACCESS

DO NOT STACK ANYTHING IN

FRONT OF THE MACHINE(S)

January 1994

FOR THE PLUMBER

NME1850 & FME2400

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, and connect to the single 3/8" male flare at
the back of the cabinet. This connection supplies
water to both ice making systems. 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 single 3/8"
FPT condenser inlet at the back of the cabinet.
This connection supplies water to both water
cooled condensers. The water pressure to all lines
must always be above 20 psig, and below 80 psig.

Drains

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

for both ice making systems 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. There is one drain for both ice
making systems. 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.

COMPLETE PLUMBING INSTALLATION, WATER

COOLED

AIR COOLED

MODELS

FIELD

SUPPLIED

HAND

VALVE

WATER

COOLED

HAND

VALVE

FILTER

WATER

FILTER

WATER

INLET

CONDENSER

INLET

CONDENSER

DRAIN

VENTED

DRAIN

VENTED

DRAIN

January 1994

FOR THE ELECTRICIAN

NME1850 & FME2400

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

AIR 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

January 1994

FOR THE INSTALLER

NME1850 & FME2400

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 above 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 1994

START UP

NME1850 & FME2400

Page 9

Pre-Start Inspection

1. Remove the front and side service panels.

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

The following procedure applies to each of the two separate ice making systems.

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).

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.

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 of each system may be
checked: it should be 33 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.

January 1994

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 Scotsman.

10. Fill out the field quality audit form, and mail it to
the Scotsman factory.

COMPONENT DESCRIPTION

NME1850 & FME2400

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.

There are two of each of the above components in these machines.

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.

Condenser

Hi Pressure Cut

Outs

Expansion Valve

Reservoir

Drain Tube

Gearbox

Control Box

January 1994

COMPONENT DESCRIPTION: Control Box

NME1850 & FME2400

Page 11

Contactor: A definite purpose contactor

connecting the compressor and the remote
condenser fan motor to the power supply.

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

ON/OFF SWITCH

LOW

PRESSURE

CUT OUT

SWITCH

Transformer: Supplies low voltage to the circuit

board.
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.

POTENTIAL

RELAY

TRANSFORMER

CIRCUIT

BOARD

CONTACTOR

January 1994

COMPONENT DESCRIPTION

NME1850 & FME2400

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 1994

ELECTRICAL SEQUENCE

NME1850 & FME2400

Page 13

Refer the wiring diagram as needed.

The following description applies to either one of
the two ice making systems. They operate
independently of each other.

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 must
be manually reset at the control .

•If the low pressure control (cut out switch)

opens, the machine will stop immediately
(through the relays on the circuit board). It must
be manually reset at the control.

•Each master switch is the manual control for

January 1994

each system, but it is not a service disconnect.

OPERATION: Water

NME1850 & FME2400

Page 14

Water enters the machine through the 3/8" male
flare at the rear of the cabinet, splits into two
separate lines, flows to a strainer at each reservoir
and then to each water reservoir which it enters
through the float valve. The water then goes out
the bottom of the reservoir tanks to the bottom of
each 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,
divides and goes to the two water regulating
valves, then through each water cooled
condenser, reconnects into one drain and down
the drain.

WATER

LEVEL

DRAIN

STRAINER

ICE

CHUTE

EVAPORATOR

EVAPORATOR

EVAPORATOR INLET

DRAIN

WATER SCHEMATIC

January 1994

OPERATION: Refrigeration

NME1850 & FME2400

Page 15

The following description applies to each of the two separate ice making systems.

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

CONDENSER

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 the
compressor, where the cycle is repeated.

System Information @ 90oF. air and 70oF. water:

•Suction Pressure: 33-34 PSIG

•Discharge Pressure, air cooled - 275 PSIG

•Discharge Pressure, water cooled - 245 PSIG

Compressor Amps:

•3 phase - 2.8

•Single phase 4.3

SUCTION LINE

LIQUID

LINE

FAN

MOTOR

HIGH PRESSURE
CUT OUT SWITCH

DISCHARGE

LINE

COMPRESSOR

EVAPORATOR

THERMOSTATIC

EXPANSION

VALVE

GEAR

MOTOR

Refrigeration Schematic

January 1994

NME1850 & FME2400

MAINTENANCE AND CLEANING

To properly clean and main ta in this pro du ct, these step s must be followe d for both sys tems.

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 panel.

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.

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.

January 1996

12. Go thru ste ps 13 -19 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
water with 1 ounce of household bleach.

14. Slowly pout the sanitizer solution 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
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.

DO NOT USE any ice produced from the
cleaning solution. Be sure no ice remains in
the bin.

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 interior by washing the interior
of the bin with the balance of the sanitizer solution.

24. Switch the master switch ON.

25. Replace the front panel.

Page 16

1

⁄2 of the sanitizer solut ion has been

o

F.) potable

MAINTENANCE AND CLEANING

NME1850 & FME2400

Page 17

These steps must be followed for both systems.

Disconnect electrical
power before beginning.

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

ICE LEVEL SENSORS:

SLIDE TO REMOVE

CLEAN THE

LIGHT SENSORS

RESERVOIR

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 .

A. Check the bearing by:

•removing the ice chute cover

•unscrewing the ice sweep

Inspect the assembly, looking for wear.
See Removal and Replacement to replace

bearing or seals. Reverse to reassemble.

4. Check and tighten all bolts and screws.

ICE SWEEP

BREAKER

COVER

•removing the water shed

•unscrewing the breaker cover.

•unscrewing the auger stud

January 1994

MAINTENANCE: Air Cooled

NME1850 & FME2400

Page 18

5. Clean each air cooled condenser. Use a vacuum
cleaner or coil cleaner if needed. Do NOT use a wire
brush.

Disconnect electrical
power before beginning.

A. Remove top panel.

TOP

PANEL

FAN MOTOR

ASSEMBLY

B. Remove two screws, and unplug the fan motors.

CAP SCREW

LOCATING

PINS

UNPLUG

LEADS

C. Pull fan motor assembly off of locating pins and
out of the unit.

D. Clean the condenser; reassemble by placing
the fan motor assembly onto the locating pins,
replacing the mounting screws, plugging the fan
motors back in, and replacing the top panel.
Reconnect power.

January 1994

MAINTENANCE AND CLEANING: Auger

NME1850 & FME2400

Page 19

In some areas the water supply to the ice maker
will have a great deal of minerals in it, 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.

/////////////WARNING///////////////

The auger has sharp

edges, handle with care.

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

ALLEN

SCREWS

BREAKER &

BEARING &

AUGER

ASSEMBLY

Disconnect electrical
power before beginning.

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. 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 pulling down and
uncapping the evaporator drain tube.

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.

January 1994

SERVICE DIAGNOSIS: Condition - No Ice Being Produced

NME1850 & FME2400

Page 20

STATUS: NOTHING OPERATES

A. Check: Voltage to the unit, restore it if there is none. Compare to the nameplate.
B. Check: The master switch , switch ON if off.
C. Check: The 2 reset switches , (high and low pressure): depress and release each switch. If the still

does not start, check: the spout switch; the high and the low side pressures.
D. Check the low pressure cut out, if closed, go to E; if it is open, it could be due to:

•Low refrigerant charge

•The auger not turning

•Restricted system

•TXV not opening

1. Check the low side pressure, the low pressure cut out opens at pressure below 4 psig.
If open, reset and:

a. Check if the auger is turning, if it is not, remove the gearbox and:

Check for internal damage, repair and replace in the machine.
b. Check for low charge, add some refrigerant, if the unit will operate,(normal
low side pressure being about 32 psig) stop and look for a leak, recover, repair, replace the

drier, evacuate, and weigh in the nameplate charge. If, with added charge, the unit

does not operate:

Check for a restricted system, replace the drier, evacuate, and weigh in a

nameplate charge.

Check for a Thermostatic Expansion Valve that does not open, if defective,

replace it. Replace the drier, evacuate, and weigh in the nameplate charge.

E. Check the high pressure cut out, if closed, go to F; if open check:

1. The pressure control opens at 450 psig. Check the high side pressure, reset the control,
and observe: on water cooled, that water soon begins to flow from the condenser drain;
or, on air cooled, that the fan is forcing air through the condenser. If the unit trips out on
pressures below 400 psig, replace the control. If the pressures rise above the trip out
point, and the unit shuts down:

a. Check for adequate water flow on water cooled, if adequate, clean the interior
of the condenser. If the pressures are still too high replace the water regulating valve.
b. Check for adequate air flow on air cooled. Clean the condenser and (if used) the

filter. If the air flow is poor because of the installation, advise the user that the unit
should be moved, or the air around it kept cooler.

Check the fan motor for tight bearings and proper rotation.

Check that the fan blades are clean, and the fan secure to the fan motor shaft.

5. Check the water level in the reservoir. The machine will not run if there is not enough water in the
reservoir.

1. Restore/adjust water level. See the next step.

January 1994

SERVICE DIAGNOSIS: Condition - No Ice Being Produced

NME1850 & FME2400

Page 21

STATUS: NOTHING OPERATES

G. Check: The gear motor, if it will not run, the compressor will not run. If no power to it:

Check: The indicator lights on the circuit board, the bin empty light should be ON, the no water light
should be OFF .

1. If the bin empty and no water lights are off, check the transformer .
a. Transformer ‘‘load’’ side should have 12 to 15 volts. If not, check the ‘‘line’’ side. The line

side should have between 208-230 volts. If the line side has the correct voltage and the

load side does not, replace the transformer.

2. If the transformer is good, and the bin empty light is OFF, check the ice level sensors .
a. Remove sensors by sliding them sideways out of the ice chute. Visually inspect them,
clean if needed.
b. Look through the ice chute ‘‘eye’’ hole for something blocking the ice chute.
c. If the unit still does not run, replace the ice level sensors.
d. If the bin empty light is still OFF, check the circuit board .

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

2. Plug ‘‘opto trans’’ and ‘‘LED’’ connectors from the Scotsman Electronic Control

Tester Model NM1 into the circuit board.

a. Move the ‘‘bin full’’ switch on the tester to the full position. The bin full light
on the tester should be ON, if not, replace the circuit board.
If the bin full light on the tester is ON, move the tester 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 not, replace the circuit board. If it does as above,
and the machine still does not run, replace the ice level sensors.

3. If the transformer is fine, and the ‘‘no water’’ light is ON, check the water level sensor.
a. Check the water level in the reservoir, restore if low. If the water level is ok:
b. Remove the water level sensor from the reservoir and clean the tip if dirty.
CAUTION: THE TIP IS MADE OF GLASS
c. Replace the water level sensor. If the no water light is still on, check that the
"water sen" plug is firmly plugged into the circuit board.
d. If the no water light is still on,

1. Unplug the ‘‘water sen’’ connector from the circuit board.

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

a. Move the water switch on the tester to ‘‘no water’’ and the no water light
on the circuit board should go on. If not, replace the board.
b. Move the water switch to the ‘‘water’’ position, the no water light should
go off, if not, replace the circuit board.
c. If after the above, the machine still will not run, replace the water level
sensor.

MORE INFORMATION ON THE TESTER CAN BE FOUND ON THE LAST PAGES OF THE MANUAL.

January 1994

SERVICE DIAGNOSIS: Condition - No Ice Produced

NME1850 & FME2400

Page 22

STATUS: GEAR MOTOR OPERATES, COMPRESSOR DOES NOT

A. Check the compressor relay.

The relay is on the circuit board, if it does not supply power to the contactor coil, the
compressor will not run.

1. Check for power at the contactor coil, if none:
a. Check for power at the compressor relay at the circuit board.
If there is power at the relay, but none at the contactor coil,

Check for an open wire between the relay and the contactor.

2. Check the contactor coil. If the coil is open, replace the contactor.

3. Check the auger drive motor centrifugal switch. If, when the drive motor is running,

contact 4 (black wire removed) has no power, and all of the above switches have been
checked, replace the centrifugal switch, or the drive motor.

4. If the compressor relay on the circuit board has power on the NO contact, but not on the COM contact,

replace the circuit board.

B. Check the compressor

1. Check the compressor start relay.

2. Check the start capacitor.

3. Check the windings of the compressor for open windings or shorts to ground.

Replace those items found defective.

January 1994

SERVICE DIAGNOSIS: Condition - Low Ice Production

NME1850 & FME2400

Page 23

STATUS: EVERYTHING IS OPERATING

A. Check the air cooled condenser for dirt. Clean as required. Check the head pressure on water cooled.

Adjust as required. If the head pressure is very high:

1. Air cooled. Check for high air temperatures, or restrictive air flow. Correct as needed.

2. Water cooled. Check for high water temperatures, or low water pressure.
Correct as needed.

3. The refrigerant may contain non condensable gases, recover, evacuate, and recharge per nameplate.

B. Check the evaporator

1. Clean the evaporator, the mineral build up will adversely affect the ice machines production.

2. Check the evaporator for water leaks, replace the water seal if found to be leaking.

3. Check the low side pressure; normal is about 32 psig. If low, assume a refrigerant leak, locate, repair and
recharge.

If no leak, the TXV may be restricted, defective or not adjusted properly. If needed, replace the TXV,
evacuate, and recharge per nameplate.

4. Check the insulation on the evaporator. It should be dry, with no wet spots or frost.
If the insulation has failed: replace the evaporator or add extra insulation in the form of foam tape to the

evaporator.

C. Check the compressor.

1. The compressor may be inefficient.
a. Check the amp draw, if low change the compressor
b. if the amp draw is normal, pinch off the suction line to check the pull down capability of the

compressor. The compressor should pull down to 25 inches of vacuum and hold there for three to five
minutes.

.

January 1994

REMOVAL AND REPLACEMENT: Water Reservoir & Bin Controls

NME1850 & FME2400

Page 24

WATER RESERVOIR

1. Shut off water supply.

2. Remove front panel.

3. Remove reservoir cover.

4. Disconnect water inlet tube from reservoir inlet
fitting.

5. To remove float valve, push in on "locking tab"
as shown and pull valve up.

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

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

7. Disconnect water outlet tubes.

8. Remove the two screws holding reservoir to
bracket.

9. Remove reservoir from machine.

10. Reverse steps 1-9 to reassemble.

Float Valve

Plunger/Seat

Locking

Tab

SLIDE BIN

CONTROLS IN

AND OUT

ICE

CHUTE

BIN CONTROLS (Ice Level Sensors)

1. Disconnect electrical power.

2. Remove the front panel.

3. Remove the control box cover.

4. Locate the 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 bin control at 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 1994

REMOVAL AND REPLACEMENT: Bearing And Breaker

NME1850 & FME2400

Page 25

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

To Remove the Breaker Bearing Assembly:

Disconnect electrical
power before beginning.

1. Remove panels and disconnect electrical power.

2. Push bail clamp back 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.

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

BEARING

ICE

SWEEP

AUGER

STUD

BREAKER

COVER

SEALS

SLOTTED

COLLAR

January 1994

REMOVAL AND REPLACEMENT: Auger

NME1850 & FME2400

Page 26

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.

Disconnect electrical
power before beginning
Use care when
removing the auger, it
has very sharp edges.

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 to evaporator.

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

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.

CAUTION

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.

BREAKER

AND AUGER

ASSEMBLY

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.

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

b. Unscrew auger stud from top of auger.

SLIDE HAMMER

PULLER

THREAD INTO THE

AUGER HERE

January 1994

REMOVAL AND REPLACEMENT: Water Seal

NME1850 & FME2400

Page 27

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 1994

REMOVAL AND REPLACEMENT: Evaporator

NME1850 & FME2400

Page 28

To Replace the Evaporator:

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

Disconnect electrical
power before beginning.

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.

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. See ‘‘To Reassemble
Evaporator and Auger’’

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.

FME Evaporator Shown

ICE SWEEP

AUGER

EVAPORATOR

ICE CHUTE

BEARING

BREAKER/DIVIDER

January 1994

REMOVAL AND REPLACEMENT: Gearmotor

NME1850 & FME2400

Page 29

Disconnect electrical
power before beginning.

WATER SHED

SEAL

COVER &

OUTPUT GEAR

ASSEMBLY

Note: There are two gear motors in each
unit.

CENTRIFUGAL

SWITCH

AUGER DRIVE MOTOR

ROTOR BEARING

SEAL

To Remove and Repair the Gearmotor 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.

To Inspect the gear motor.

A) Remove the cap screws holding the gear motor 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.

January 1994

REMOVAL AND REPLACEMENT

NME1850 & FME2400

Page 30

Removing Condenser Fan Motor Assembly

Disconnect electrical
power before beginning.

CAP SCREWS

LOCATING

PINS

FAN

MOTOR

WIRE

FAN MOTOR

ASSEMBLY

1. Remove the top panel.

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

3. Remove two hex head bolts from top end of fan
motor assembly, (see the illustration).

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 1994

Removal and Replacement: Refrigeration System

NME1850 & FME2400

Page 31

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 Stem

to 6-8 ft. lb..

Torque Cap to

8-12 ft. lb..

ACCESS

VALVE

Torque Cap to

7-12 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 1994

CIRCUIT BOARD TESTING

NME1850 & FME2400

Page 32

WARNING

These procedures require the machine to be
connected to the power supply. The voltages of
the electronic circuit are very low, but HIGHER

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 "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:

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.

PHOTO TRANS

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.

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.

Water Level

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.

LED

LIGHT GOES

ON

SWITCH TO

‘‘FULL’’

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

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

Bin Control

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.

January 1994

LIGHT ON

WATER SENS

SWITCH TO

‘‘NO WATER’’

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.