Scotsman NME1854R Operator’s Manual

INTRODUCTION

NME1854R & FME2404R

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 either ice system.

The product is a remote condenser modular ice
system. Its features include: front service for the
freezer, gear motor, control box, water reservoir,
and bin control; an electronic circuit for monitoring
ice and water level; and R-404A as the refrigerant.

Table of Contents

FOR THE INSTALLER ···································· Page 2
REMOTE CONDENSER SPECIFICATIONS ························· Page 3
FOR THE INSTALLER ···································· Page 4
Remote Condenser Location ································· Page 5
FOR THE INSTALLER: Remote Condenser ························· Page 6
FOR THE INSTALLER: Precharged Lines ·························· Page 7
FOR THE INSTALLER: Location ······························· Page 8
FOR THE PLUMBER ····································· Page 9
FOR THE ELECTRICIAN ·································· Page 10
FOR THE INSTALLER: Completed Installation ······················· Page 11
FOR THE INSTALLER: Final Check List ··························· Page 12
START UP ·········································· Page 13
COMPONENT DESCRIPTION ································ Page 14
OPERATION: Water ····································· Page 15
COMPONENT DESCRIPTION: Control Box ························· Page 16
ELECTRICAL SEQUENCE ·································· Page 17
SYSTEM INFORMATION ·································· Page 18
OPERATION: Refrigeration ································· Page 19
OPERATION: Refrigeration ································· Page 20
CLEANING and SANITATION ································ Page 21
SENSOR MAINTENANCE ·································· Page 22
BEARING MAINTENANCE ·································· Page 23
AUGER MAINTENANCE ··································· Page 24
SERVICE DIAGNOSIS: Condition ······························ Page 25
SERVICE DIAGNOSIS: ··································· Page 26
CONTROL SYSTEM DIAGNOSTICS ···························· Page 27
REMOVAL AND REPLACEMENT: Water Reservoir & Bin Controls ············· Page 28
REMOVAL AND REPLACEMENT: Bearing And Breaker ·················· Page 29
REMOVAL AND REPLACEMENT: Auger ·························· Page 30
REMOVAL AND REPLACEMENT: Water Seal ······················· Page 31
REMOVAL AND REPLACEMENT: Evaporator ······················· Page 32
REMOVAL AND REPLACEMENT: Gear motor Assembly ·················· Page 33
REFRIGERATION SYSTEM SERVICE ··························· Page 34
What to Do Before Calling for Service ···························· Page 35

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

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

January 2000

Page 1

NME1854R & FME2404R

FOR THE INSTALLER

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

B90 and extensions, with bin top

·

KBT18.

BH800 no bin top needed.

·

BH900 using bin top KBT14.

·

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

·

All kits, legs, and information

·

required for the specific job.

There are two separate ice making

and refrigeration systems in this

model. The liquid and discharge

lines from each system must go to

separate circuits in one remote

condenser (ERC302).

Ice Chute

6.7" x 6.2"

TOP VIEW

Allow 6" of space behind the machine

for utility connections.

34.84"

BACK VIEW Liquid Line

15.53"

3.1"

21"

3.1"

18.28"

13.84"

Discharge Line

Connection

(left system)

Allow 6"

above

machine for

service.

20.84"

5.25"

3"

17.8"

18.8"

SPECIFICATIONS: Ice Machine

Model Number Dimensions

(w/o bin)

HXWXD

FME2404RS-32A 27" x 42" x 24" 208-230/60/1 FLAKE R-Air 22.8 30 208

FME2404RS-3A 27" x 42" x 24" 208-230/60/3 FLAKE R-Air 17.6 20 208

NME1854RS-32A 27" x 42" x 24" 208-230/60/1 Nugget R-Air 22.8 30 208

NME1854RS-3A 27" x 42" x 24" 208-230/60/3 Nugget R-Air

Basic

Electrical

21.66"

Ice Type Cond.

Type

Drain 3/4" FPT

Minimum

Circuit

Ampacity

Remote Condenser

Electrical Inlet

Water Inlet 3/8" Flare

Maximum
Fuse Size

4.5"

9.43"

Junction Box

Refrigerant

Minimum circuit ampacity is used to determine wire size and type per National Electrical Code.

January 2000

Page 2

Charge

NME1854R & FME2404R

REMOTE CONDENSER SPECIFICATIONS

Model Use with Basic Electrical
ERC302-32 1 FME2404R or NME1854R 208-230/60/1

ERC DIMENSIONS

Model A B F G
ERC302 43

13

23

3

"10

8

"

16

3

4

3

21

"16

4

5

"

8

Other Required Items:
RTE25 Precharged line set, 25’, R-404A - 2 required.
Or: RTE40. Precharged line set, 40’, R-404A - 2 required.

7

19

"

8

Ice Machine NAMEPLATE

LOCATED ON BACK PANEL

SERIAL PLATE LOCATED

BEHIND FRONT PANEL

REMOTE CONDENSERS AND BINS ALSO

HAVE MODEL AND SERIAL NUMBERS

January 2000

Page 3

NME1854R & FME2404R

FOR THE INSTALLER

Installation Limitations:

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

Min Max

0

Air Temperature 50
(Not including the remote condenser)
Water Temperature 40
Water Pressure (psi) 20 80
Voltage 198 253
(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.

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.

F 1000F

0

F 1000F

Location

Install the machine a location where it has enough
space around it to be accessible for service,
usually a minimum of 6 inches. Avoid hot, dirty and
crowded locations. Be sure that the location for the
machine is within its limitations for air and water
temperatures.

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.

Install the bin top according to the directions with
the bin top.

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

Ice Machine

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

Remove the front panel and remove any shipping
blocks.

Note: Be sure to allow a 6" minimum space
above the top of the machine for service.

January 2000

Page 4

Remote Condenser Location

NME1854R & FME2404R

Use the following for planning the placement of
the condenser relative to the ice machine

Location Limits - condenser location must not
exceed ANY of the following limits:

Maximum rise from the ice machine to the

·

condenser is 35 physical feet

Maximum drop from the ice machine to the

·

condenser is 15 physical feet

Physical line set maximum length is 100 feet.

·

Calculated line set length maximum is 150.

·

Calculation Formula:

Drop = dd x 6.6 (dd = distance in feet)

·

Rise = rd x 1.7 (rd = distance in feet)

·

Horizontal Run = hd x 1 (hd = distance in feet)

·

Calculation: Drop(s) + Rise(s) + Horizontal Run

·

= dd+rd+hd = Calculated Line Length

Configurations that do NOT meet these
requirements must receive prior written
authorization from Scotsman.

Do NOT:

Route a line set that rises, then falls, then rises.

·

Route a line set that falls, then rises, then falls.

·

Calculation Example 1:

The condenser is to be located 5 feet below the ice
machine and then 20 feet away horizontally.

5 feet x 6.6 = 33. 33 + 20 = 53. This location would

be acceptable

Calculation Example 2:

The condenser is to be located 35 feet above and
then 100 feet away horizontally.

35 x 1.7 = 59.5. 59.5 +100 = 159.5. 159.5 is

greater than the 150 maximum and is NOT
acceptable.

rd

22.87"

dd

17.15"

Remote

Condenser

Located ABOVE

Ice Machine

Remote

Condenser

Located BELOW

Ice Machine

hd

40.35"

January 2000

Page 5

NME1854R & FME2404R

FOR THE INSTALLER: Remote Condenser

Location

Select the best available location, protecting the
condenser from extremes of dirt, dust, and sun.

Meet all applicable building codes. Usually the
services of a licensed electrician are required.

Roof Attachment

1. Install and attach the remote condenser to the
roof of the building, using the methods and
practices of construction that conform to the local
building codes, including having a roofing
contractor secure the condenser to the roof.

2. Have an electrician connect the remote
condenser fan motor to the Ice Machine, using the
junction box at the back of the Ice Machine.

PRECHARGED LINE ROUTING

CAUTION

Do not connect precharged tubing until all routing
and forming of the tubing is complete. See the
coupling instructions for connecting information.

1. Each set of precharged refrigerant lines (either
25 foot or 40 foot) consists of a 3/8 inch diameter
liquid line and a 1/2 inch diameter discharge line.
Both ends of each line have quick connect
couplings, one end has a schrader valve
connection, that end goes to the condenser.

Note: The openings in the building ceiling or wall,
listed in the next step, are the minimum sizes
recommended for passing the refrigerant lines
through.

2. Have the roofing contractor cut a minimum hole
for the refrigerant lines of 1 3/4 inch. Check local
codes, a separate hole may be required for the
electrical power to the condenser.

CAUTION

DO NOT KINK OR CRIMP REFRIGERANT
TUBING WHEN INSTALLING IT.

Note: Precharged tubing contains a R-404A
holding charge. The entire refrigerant charge
required for the system is contained in the ice
machine.

Tubing illustration shows tight spiral; a spiral in the
field depends on tubing limitations. Tight spiral not
required.

REMOTE CONDENSER

SPIRAL

EXCESS

TUBING

INSIDE

BUILDING

LOCATE REMOTE

CONDENSER ABOVE

Ice Machine

3. Route the refrigerant lines through the roof
opening.

Follow straight line routing whenever possible.
Any excess tubing MUST be retained within the

building.

4. Spiral the excess length of pre charged tubing
inside the building. Use a horizontal spiral (as
illustrated) to avoid any traps in the lines.

5. Have the roofing contractor seal the holes in the
roof per local codes.

January 2000

Page 6

FOR THE INSTALLER: Precharged Lines

NME1854R & FME2404R

Note: The couplings on the sets of precharged
lines must be installed properly to prevent leaking.
Carefully follow the instructions:

Initial Connections:

1. Remove the protector caps and plugs. Wipe the
seats and threaded surfaces with a clean cloth to
be certain that no foreign matter remains on them.

2. Lubricate the inside of the couplings, especially
the O-Rings with refrigerant oil.

Clean and Lubricate Couplings

3. Position the fittings on the correct connections
on the condenser and ice machine.

· The ½ inch discharge line (schrader valve end)

goes to the remote condenser fitting marked
“discharge line.”

3

·

The
to the remote condenser fitting marked “liquid

line.”

·

The ½ inch discharge line goes to the Ice
Machine fitting marked “discharge line.”

·

The
fitting marked “liquid line.”

Final Connections:

4a. Begin by tightening the couplings together by
hand. Continue to turn the swivel nuts by hand until
is is certain that the threads are properly engaged.

inch liquid line (schrader valve end) goes

8

3

inch liquid line goes to the Ice Machine

8

4b. Using two wrenches, one to rotate the swivel
nut and one to hold the tubing, tighten each
coupling.

Tighten Swivel Nut

It is CRITICAL that ONLY the NUT on the
pre-charged tube be turned or the diaphragms will
be torn loose by the piercing knives and be loose
in the refrigeration system causing severe
operational problems.

Note: As the coupling is tightened, the diaphragms
in the quick connect couplings will begin to be
pierced. As that happens, there will be increased
resistance to tightening the swivel nut.

4c. Continue tightening the swivel nut until it
bottoms out or a very definite increase in
resistance is felt (no threads should be showing).
Do NOT overtighten.

5. Using a marker or pen, mark a line lengthwise
from the coupling union nut to the bulkhead. Then
tighten the coupling and additional 1/4 turn. As the
nut turns, the line will show when 1/4 turn is made.

6. After all connections are made, and after the
king valve has been opened (do not open at this
time), check the couplings for leaks.

SCHRADER

TO REMOTE

CONDENSER

NO SCHRADER

VALVE

Rotate Swivel Nut ¼ Turn More

TO Ice Machine

January 2000

Page 7

NME1854R & FME2404R

FOR THE INSTALLER: Location

CONTACT ROOFING

CONTRACTOR

EXCESS

PRECHARGED

TUBING INSIDE

BUILDING

REMOTE

CONDENSER

ROOF

CUTAWAY

ICE MACHINE

SERVICE

ACCESS

SERVICE ACCESS

SIDE AND BACK

WALL

CUTAWAY

January 2000

Page 8

FOR THE PLUMBER

CONFORM TO ALL APPLICABLE CODES

NME1854R & FME2404R

Water Inlet

HAND SHUT

OFF VALVE

CONNECT TO

COLD WATER

WATER INLET

3/8" MALE

FLARE

FIELD SUPPLIED

WATER FILTER

VENT ICE
MACHINE

DRAIN,

3/4" FPT

Connect the ice machine to cold
potable water. Use 3/8" O.D. copper
tubing, and 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.

Drains

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. Install 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.
Storage Bin: Install a separate

gravity type drain. Insulation of this
drain line is recommended.

VENT BIN DRAIN

3/4" FPT

FLOOR DRAIN

January 2000

Page 9

NME1854R & FME2404R

FOR THE ELECTRICIAN

CONFORM TO ALL APPLICABLE CODES

Connect electrical power to the wires in 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.

The Ice Machine 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.

Electrically the remote condenser fan motor is
connected to the Ice Machine at the contactor
terminals for the compressor and the fan motor
operates whenever the compressor operates.

TERMINAL STRIP

FOR REMOTE

CONDENSER

ICE MACHINE

JUNCTION BOX

POWER

SUPPLY

Electrical connections are made at the junction
box at the back of the Ice Machine and at the
junction box on the remote condenser.

The remote condenser must be wired to the Ice
Machine in accordance with local and national
electrical codes with a minimum of 18 Awg. wire
with an ground bonding wire connected to the
ground screws provided in both the condenser and
machine field wiring boxes. All outdoor wiring must
be in rain proof conduit.

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.

GROUND

THE

CHASSIS

RAIN PROOF

CONDUIT

January 2000

Page 10

NME1854R & FME2404R

FOR THE INSTALLER: Completed Installation

A typical installation should generally appear as
illustrated below. The remote condenser must be
located above the Ice Machine and the precharged
lines installed per the instructions on page 6.

INSULATED
PRECHARGED
REFRIGERANT

TUBING

January 2000

Page 11

NME1854R & FME2404R

FOR THE INSTALLER: Final Check List

1. Is the ice system installed
indoors in a location where the air
and water temperatures are
controlled, and where they do not
exceed the design limitations?

2. Is there an electrical service
disconnect within sight of the
installed machine? Has the
voltage been checked, and
compared to nameplate
requirements?

3. Have all the plumbing
connections been made and
checked for leaks?

4. Has the machine and bin been
leveled?

5. Is there a minimum of 6"
clearance at the rear, left, right
and above the machine for
proper service access?

6. Is the water pressure a
minimum of 20 psig?

7. Has the machine been secured
to the bin?

8. Is there a water shut off valve
installed near the machine?

9. Is the remote condenser
installed per local building codes,
and in a place where it has
adequate ventilation and minimal
solar heat gain?

10. Has all shipping material and
literature (inside the front panel)
been removed from the units?

11 Have the remote condenser
and precharged lines been
properly installed?

12. Has the electrical connection
between the Ice Machine and the
condenser been made?

13. Verify that the master
switches are in the OFF position.

14. Switch on the electrical
power.

15. Refer to Pre-Start
instructions, the next page.

REMOTE

CONDENSER

SECURED?

PLUMBING?

ROOF

HOLES

SEALED?

POWER

SUPPLY?

LEVELED?

January 2000

Page 12

START UP

Pre-Start Inspection

1. Remove the front, left, and right side service
panels.

2. Check that any shipping blocks have been
removed.

3. Inspect the interior of the machine for loose
screws or wires. Check that no refrigerant lines
are rubbing each other. Check that the fan blade
turns freely (remote condenser).

4. Check that the refrigerant lines are properly
installed.

5. Check that the electrical power has been on for
at least 4 hours and that the compressor domes
are warm.

NME1854R & FME2404R

6. Check that the unit is installed correctly
according to the final check list on page 12.

Start Up

1. Go through the pre-start inspection.

2. Open the hand valve, observe that water enters
the water reservoirs, fills the tubes from the
reservoirs to the evaporators, and then shuts off.
Check for leaks.

3. Open each King (receiver service) valve.

4. Switch each master switch on.
The electrical start up sequence is automatic.
There will be a short (15 second) delay before the

gear motor starts and the liquid line valve opens,
after that the low pressure control will close and
the compressor will start.

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

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

9 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.

10. Fill out the manufacturer’s registration and mail
it to Scotsman.

5. The remote condenser fan turns, and the
condenser begins to discharge warm air.

6. The unit should soon be making ice, if desired
the low side pressure of each system can be
checked, it should be 32 psig + or - 2 psig. The
discharge pressure will depend upon air and water
temperatures, but should be between 205 psig and
280 psig.

January 2000

Page 13

NME1854R & FME2404R

COMPONENT DESCRIPTION

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

High Pressure Cut Out: An automatic reset
switch sensing the high side refrigeration pressure.
It is set to shut the machine off at 450 psig.

Pump Down Control: An automatic reset pressure
switch connected to the low side of the
refrigeration system. Controls the compressor.

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

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.

NOTE: THERE ARE TWO OF

EACH OF THE LISTED

COMPONENTS IN EACH UNIT

HEAD PRESSURE
CONTROL VALVE

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.

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

Compressor: The refrigerant vapor pump.
Expansion valve: The refrigerant metering

device.

EXPANSION VALVE

ICE CHUTE

RESERVOIR

WATER LEVEL

SENSOR

CLEANING

DRAIN TUBE

HIGH PRESSURE

CUT OUT

COMPRESSOR

EVAPORATOR

GEAR MOTOR

ICE LEVEL

SENSOR

CONTROL BOX

January 2000

Page 14

OPERATION: Water

Water enters the machine through the 3/8" male
flare at the rear of the cabinet, divides into two inlet
lines to each water reservoir which it enters
through the float valve. The water them goes out
the bottom of the reservoir tanks to the bottom of
the evaporators.

Reservoir overflow or evaporator condensation is
combined into a common drain line and routed to
the drain.

WATER INLET

NME1854R & FME2404R

RESERVOIR

ICE

CHUTE

EVAPORATOR

WATER

LEVEL

DRAIN

EVAPORATOR

DRAIN

January 2000

Page 15

WATER SCHEMATIC

NME1854R & FME2404R

COMPONENT DESCRIPTION: Control Box

There are two control boxes in the machine.

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 liquid line valve.

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

machine.

Control Board

Water OK Light

Power Light

Service Light

Freeze Light

Bin Full

Light

LED1

Compressor

Relay

LED3

January 2000

Page 16

Auger

Relay

ELECTRICAL SEQUENCE

NME1854R & FME2404R

There are 7 indicator lights on the control board:

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

·

Glowing. Glows when there is water in the
reservoir.

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

·

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

Service. Red. Normally Off.

·

Freeze. Red. Normally glowing when making

·

ice.

Bin Full. Red. Normally Off when making ice.

·

LED1. White. Located next to the board’s

·

Compressor Relay. Normally Glowing when
making ice.

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

·

Motor Relay. Normally Glowing when making

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

The PWR-OK light glows.

·

If there is water in the reservoir the WTR-OK

·

light glows.

·

After 10 seconds the Freeze, LED1 and LED3

lights glow and the machine starts up.

Start Up:

·

The compressor relay and auger motor relay

become energized, connecting power to the

windings of the auger motor and liquid line valve

coil.

·

The liquid line valve opens, refrigerant flows to

the expansion valve.

·

The pump down pressure switch closes

connecting power to the contactor coil

·

The contactor is energized, connecting power to

the compressor, and the compressor starts.

·

As ice is made it passes between the ice level

sensors but because it is not a continuous

stream it only interrupts the sensor’s infrared

beam momentarily. The bin full light remains off

and the machine stays on until ice builds up in

the bin and blocks the path between the

sensors for 6 seconds or longer. When that

occurs the bin full light glows and the machine

shuts down.

Shut Down:

The compressor relay opens, LED1 goes out.

·

The liquid line valve closes, stopping refrigerant

·

flow.

The pump down control opens after the suction

·

pressure falls to its cut out point.

The compressor contactor opens

·

The compressor stops

·

The auger motor stays on for 1 more minute,

·

clearing out ice in the evaporator, and then

The auger motor relay opens, LED3 goes out

·

and the auger motor stops.
The liquid line valve will not reopen until 2 minutes
or more have passed after the last shut down.

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

Control Board Protection Devices

When the water level in the reservoir falls

·

below the water level sensor’s tip, the WTR-OK

light goes out and the machine shuts down.

When water refills the reservoir the WTR-OK

light glows and the machine starts up again.

·

If the auger drive motor current becomes

excessive the liquid line valve and auger drive

motor will be switched Off and the Service light

will blink. The control board will restart the auger

drive motor in 4 minutes. If during the first 60

seconds after restart the auger motor current

stays within limits, the liquid line valve is

reopened and the machine returns to normal

operation. If the auger motor’s current is

excessive within 60 seconds after the restart,

the process will be repeated once more. If

during that try the current is still excessive the

machine shuts down and must be manually

reset. The service light will then be glowing

continuously.

To Reset: Disconnect and reconnect power to
the ice machine.

Other Protection Devices:

·

If the high pressure cut out switch opens the

machine will stop immediately. It will

automatically reset when the high pressure falls

below its cut in point.
The mode (on - off) switch is the manual control
for the complete machine, but it is not a service
disconnect.

January 2000

Page 17

NME1854R & FME2404R

SYSTEM INFORMATION

Information @ 90oF. air and 70oF. Water:

Typical Suction Pressure

35 PSIG

·

Typical Discharge Pressure

260 PSIG

·

Minimum Discharge pressure (low temps)

180 PSIG

·

Typical Compressor Amps

Single Phase = 4.3

·

Three Phase = 2.8

·

Low Pressure (pump down) Control

Cut in 30

·

Cut out 15

·

High Pressure Cut Out - Automatic Reset

Cut in 350

·

·

Cut out 450

January 2000

Page 18

OPERATION: Refrigeration

There are two separate refrigeration systems in this machine.

NME1854R & FME2404R

At the compressor, refrigerant is compressed into
a high temperature gas. The discharge line directs
this gas to the condenser. At the remote
condenser the gas is cooled by air and it then
condenses into a liquid. This high pressure liquid
then goes through the liquid line to the head
pressure control valve, into the receiver, through
the liquid line valve and then through 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.

At the evaporator, the refrigerant enters an area of
relatively low pressure, where it can easily “boil off”

Refrigeration Schematic

DISCHARGE

LINE

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.

HEAD

PRESSURE

CONTROL

VALVE

LIQUID LINE

KING

VALVE

PRESSURE CONTROL

LIQUID LINE

VALVE

SUCTION

LINE

REMOTE CONDENSER

DETAIL OF HEAD

VALVE

THERMOSTATIC

EXPANSION

VALVE

EVAPORATOR

RECEIVER

COMPRESSOR

January 2000

Page 19

NME1854R & FME2404R

OPERATION: Refrigeration

There are two separate refrigeration systems in this machine.

Low Condensing Temperature

The refrigeration system under low condenser air
temperatures is much the same as it is under
higher temperatures, with the exception that the
resulting low head pressures cause the head
pressure control to close off the liquid line between
the condenser and the receiver.

This forces more refrigerant into the condenser
(with a small amount of discharge gas going into
the receiver to maintain pressure until the head
pressure is built back up to the rated gauge
pressure of 180 psig). At that pressure the valve
opens up the liquid line from the condenser to the
receiver.

Head Pressure Control Valve - Low

From

Compressor

Temperature

Valve

Disk

To

Receiver

Head Pressure Control Valve - Normal

From

Compressor

Temperature

Valve

Disk

To

Receiver

From Condenser

PUMP DOWN

During the pump down cycle (usually initiated by
the circuit board de-energizing the liquid line valve)
the discharge gases flow through their normal path
to the remote condenser, through the head
pressure control, and into the receiver.

January 2000

From Condenser

At this point the refrigerant flow is stopped by the
closed liquid line valve. This action forces the
refrigerant into the receiver and keeps it out of the
compressor. The pump down continues until the
low pressure control turns the compressor off.

Page 20

NME1854R & FME2404R

CLEANING and SANITATION

These units consist of two separate Ice Machines; to properly clean and maintain the them, these steps

must be followed for both systems.

A Scotsman Ice System represents a sizable investment of time and money in any company’s business. In
order to receive the best return for that investment, it MUST receive periodic maintenance.
It is the USER’S RESPONSIBILITY to see that the unit is properly maintained. It is always preferable, and
less costly in the long run, to avoid possible down time by keeping it clean; adjusting it as needed; and by
replacing worn parts before they can cause failure. The following is a list of recommended maintenance
that will help keep the machine running with a minimum of problems.
Maintenance and Cleaning should be scheduled at a minimum of twice per year.

ICE MAKING SYSTEM: In place cleaning

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

2. Remove screws and the front panel.

3. Move the ON-OFF switch to OFF.

4. Remove all the ice from the storage bin.

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

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

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

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

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

12. Go thru steps 13-19 to sanitize the ice machine
water system.

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

A possible sanitizer solution may be obtained by
mixing two gallons of warm (90-115oF.) potable
water with 1 ounce of household bleach.

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

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

1

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

17. Drain the reservoir and thoroughly wash the
interior of the reservoir and cover with sanitizer
solution. Be sure the drain hose is upright and
capped.

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

19. Switch the master switch to ON

20. Continue ice making for at least 15 minutes, to
flush out any cleaning solution.

of the sanitizer solution has been added

2

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

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

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

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

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

January 2000

21. Remove all ice from the storage bin.

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

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

24. Switch the master switch ON.

Page 21

NME1854R & FME2404R

SENSOR MAINTENANCE

These units consist of two separate Ice Machines; to properly clean and maintain the them, these steps

must be followed for both systems.

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

ICE DISCHARGE

CHUTE

SLIDE IN AND

OUT

ICE LEVEL

SENSORS

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.

3. Clean the air cooled remote condenser coil when
it becomes restricted.

January 2000

Page 22

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

BEARING MAINTENANCE

NME1854R & FME2404R

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

Check the breaker bearing by:

removing the ice chute cover

·

Chute Cover

unscrewing the ice sweep

·

Ice Sweep

unscrewing the auger stud

·

Auger Stud

Cap Screw

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

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

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

See Removal and Replacement section to replace
bearing or seals.

·

removing the water shed and the breaker
cover (left hand thread)

Breaker Cover

Off

Grease
Needle, part
number
02-3559-01.

Reverse to reassemble.

January 2000

Page 23

NME1854R & FME2404R

AUGER MAINTENANCE

In some areas the water supply to the Ice Machine
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 and
replacement of these parts, see REMOVAL AND
REPLACEMENT.

Shut off water and electrical 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.

ICE

SWEEP

6. 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.

7. Replace the water seal.

8. Reverse to reassemble.

ALLEN

SCREWS

BREAKER &

BEARING &

AUGER

ASSEMBLY

BREAKER

COVER

4. Remove ice chute from evaporator.

5. Remove 4 allen screws holding breaker to
evaporator.

January 2000

Page 24

NME1854R & FME2404R

SERVICE DIAGNOSIS: Condition

Symptom Possible Cause Probable Correction

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

Unit off due to master switch in Off
position

Unit off due to low water level in
reservoir

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

Unit off due to scale on water level
sensor

Unit off due to high pressure control
open

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

Unit is shut down Circuit board has shut ice machine

Pump down pressure control open,
very low suction pressure

Move master switch to ON

Check water supply, filter and float
valve.

Check/clean ice level sensors

Clean water level sensor

Check for remote condenser fan
motor failure or power interruption to
the fan motor

yet shut unit down.

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

Auger not turning due to: motor
failure; auger relay failure on circuit
board; or gears stripped. Check drive
train.

Liquid line valve not opening due to
coil failure or failure of compressor
relay on circuit board

TXV restricted or not metering. Check
bulb temperature.

Lack of refrigerant. Check for a leak.

No power to circuit board Check harness

Hi or Low pressure switches open

Circuit board gear motor relay open Check / replace board

Water level or ice level sensor failed Check / replace sensor

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

Compressor will not start Check start capacitor

Check start relay

Check compressor windings

Circuit board relay will not close Check / replace board

Pump down pressure switch does not
close, liquid line valve open and
suction pressure high

Check pump down switch contacts

January 2000

Page 25

NME1854R & FME2404R

SERVICE DIAGNOSIS:

Symptom Possible Cause Probable Correction

Unit makes ice, but very slowly High discharge pressure because of a

dirty condenser coil

Auger and evaporator are coated with
mineral scale

Low refrigerant charge Locate leak. Recover refrigerant,

Water leak Ice storage bin drain restricted Clean out drain

Tubing cracked Replace tubing

Condensation on drain tubing Insulate tubing

Hose off Re-attach hose

Reservoir cover off Return cover to reservoir

Reservoir cracked Replace reservoir

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

Excessive ice meltage Bin drain clogged Clean out bin drain

Clean the condenser

Clean the water system

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

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

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 or replace

Clean with Scotsman Ice Machine
Cleaner

January 2000

Page 26

CONTROL SYSTEM DIAGNOSTICS

NME1854R & FME2404R

The control system consists of:

Control Board

·

Water Sensor

·

Ice Sensors

·

High Pressure Cut Out

·

Low Pressure Cut Out

·

If the unit is OFF, check the control board:

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

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

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

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

OR connect a copper wire to the wire where the
water sensor plugs into and place the other end in
the water. The water OK light should go ON. If it
does not, replace the control board.

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

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

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

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

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

B. With the On - Off (mode) switch in either
position, move the Bin Full switch on the tester to
Bin Full - the tester's light will blink and after a few
seconds the bin full light on the control board will
come on. If not, replace the board.

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

4. High pressure cut out check.
Disconnect electrical power.

January 2000

Pull the wires off the high pressure cut out.
Use an ohmmeter to determine if the switch is

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

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

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

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

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

Page 27

NME1854R & FME2404R

REMOVAL AND REPLACEMENT: Water Reservoir & Bin Controls

WATER RESERVOIR

1. Shut off the water supply to the Ice Machine.

2. Remove front panel and reservoir cover.

3. Disconnect water inlet tube from reservoir inlet
fitting.

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

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

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

8. Disconnect water outlet tubes.

9. Remove mounting screws from reservoir bracket
and remove the reservoir from the Ice Machine.

10. Reverse to reassemble.

FLOAT

ASSEMBLY

Water

Sensor

SLIDE BIN

CONTROLS IN

AND OUT

ICE

CHUTE

LOCKING

TABS

BIN CONTROLS (Ice Level Sensors)

1. Disconnect electrical power.

2. Remove front panel.

3. Remove control box cover.

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

5. Slide each bin control to the left, and 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 2000

Page 28

NME1854R & FME2404R

REMOVAL AND REPLACEMENT: Bearing And Breaker

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

To Remove the Breaker Bearing Assembly:

Disconnect electrical
power before
beginning.

1. Remove panels and disconnect electrical power.

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

3. Unscrew and remove ice sweep.

4. Lift up and remove ice chute.

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

a. Unscrew breaker cover from breaker (left hand

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. A36808-001 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 (NME) breakers do not have a Slotted Collar.

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

ICE

SWEEP

AUGER

STUD

SLOTTED

COLLAR

ALLEN

SCREWS

January 2000

Page 29

NME1854R & FME2404R

REMOVAL AND REPLACEMENT: Auger

Note that the auger has very sharp edges.

Moving parts hazard.

Disconnect electrical
power before
beginning.

To Remove the Auger:

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

1. Remove the top panel.

2. 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.

BREAKER

BEARING

ASSEMBLY

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

a. 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 reach of children.

b. 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.

Note: Repeat the above for each 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.

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 on breaker to remove from auger.
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.

STOP

SLIDE HAMMER PULLER

REMOVING AUGER

THREAD

INTO

AUGER

DRIVE SLIDE UP AGAINST
STOP TO LOOSEN AUGER

January 2000

Page 30

NME1854R & FME2404R

REMOVAL AND REPLACEMENT: Water Seal

To Remove the Water Seal:

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

1. The gear motor/evaporator assembly will have
to be exposed (if not yet done).

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.

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.

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.

REMOVAL OF THE

WATER SEAL

WATER SEAL

RETAINING

RING

January 2000

Page 31

PLACE A BEAD OF

FOOD GRADE

SEALANT HERE

NME1854R & FME2404R

REMOVAL AND REPLACEMENT: Evaporator

To Reassemble the Evaporator and Auger

1. After the gear motor has been inspected, fasten
the evaporator to the gear motor, be sure that the
number of shims indicated on the gear case cover

Disconnect electrical
power before
beginning.

Shut off the water supply before beginning.
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 Machine.

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.

is in place between the gearcase cover and the
drip pan gasket. 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.

b) At the suction line at the joint about 3" from the
evaporator.

3. Disconnect the water inlet tube, and remove the
evaporator.

4. Unsweat the drier from the liquid line.

Repeat the above, as required, for each system.

5. After installing a new water seal in the new
evaporator ( see “To Replace the Water Seal”)
resweat the 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”

RECEIVER

FRONT SEATED KING VALVE

SERVICE PORT

CHARGING

CYLINDER

Charging Procedures

Extra care must be taken when
recharging this remote system. No
liquid refrigerant may be placed in the
system at the compressor. DO NOT
use the access valves at the front of
the unit for weighing in the charge. All
liquid R-404A must be weighed into
the receiver through the “front seated”
king valve.

January 2000

Page 32

NME1854R & FME2404R

REMOVAL AND REPLACEMENT: Gear motor Assembly

WATER SHED

DRIVE MOTOR

SEAL

OUTPUT GEAR,

OUTPUT SHAFT,

AND BEARINGS

Note: There are two gear motors in each unit.

BEARING

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.

Disconnect electrical
power before
beginning.

2. Unscrew the 4 cap screws holding the gear
motor to the gear motor plate.

3. Remove the gear motor from the Ice Machine.

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 case cover output gear, bearings, and
shaft are one pressed together assembly.

January 2000

Page 33

NME1854R & FME2404R

REFRIGERATION SYSTEM SERVICE

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

When the system is serviced, a special liquid

·

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

R-404A is not compatible with mineral oil so

·

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

Special leak detection equipment is required to

·

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

Evacuate to 300 microns.

·

Liquid charge the system

·

Access Valves: To use the access valves:

Remove the cap from the stem, use a 3/16"

·

allen wrench to check that the valve is
CLOSED. The remove the core cap.

Close the valve and replace the caps when

·

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

Head Pressure Control Valve

1. Purge system of refrigerant

2. Break off process tube on the top of the OLD
head pressure control valve.

3. Unsweat old valve from tubing.

4. Unsweat old dryer from tubing.

5. Install new valve in place, check for correct
connections and be sure the number on the side of
the valve is “180"

6. Wrap the new valve body in wet cloths to heat
sink the valve body.

7. Sweat in the new valve and the new dryer.

8. Evacuate the system, and weigh the nameplate
charge into the receiver.

CHARGING PROCEDURES

Extra care must be taken when recharging this
remote system. No liquid refrigerant maybe placed
in the system at the compressor. DO NOT use the

RECEIVER

KING VALVE

January 2000

valves at the front of the unit for weighing in the
charge. All liquid refrigerant must be weighed into
the receiver through the “front seated” king valve.

SERVICE PORT

Page 34

CHARGING

CYLINDER or

SCALE

What to Do Before Calling for Service

If the machine is off, not making
ice:

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

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

3. If both water and power have
been checked and are available,

NME1854R & FME2404R

try switching the power Off and
then On. After 2 minutes the
machine should restart.

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

January 2000

Page 35