Scotsman NME1254R, FME1504R User Manual

NME1254R & FME1504R

INTRODUCTION

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.

Table of Contents

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

Note this symbol

when it appears.

January 2000

Page 1

It marks a possible hazard.

NME954R & FME1204R

FOR THE INSTALLER

Either the FME1204R or the NME954R is
designed to fit the following Scotsman storage
bins:

SB480 and extensions (with bin top KBT18)

·

BH800 using bin top KBT15 (one unit) or KBT25

·

(two units).

BH801 using bin top KBT28

·

BH900 with KBT24 (one unit)

·

BH900 with KBT25 (two units side by side)

·

Allow 6" above machine

for service.

NME954 Dispenser Applications

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

Back View

ID150 use adapter KBT42 and KNUGDIV

·

ID200 or ID250, use adapter KBT46 and

·

KDIL-N-ID2

Cornelius ED/DF200 beverage dispensers, use

·

KBT46 and KDIL-N-200

Cornelius ED/DF250 beverage dispensers, use

·

KBT46 and KDIL-N-250

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

·

Liquid Line Connection

Discharge Line Connection

Remote Condenser

Junction Box

Electrical Inlet

20.84"

2.96"

Drain

3/4" FPT

SPECIFICATIONS: ICE MAKER

Model Number Dimensions

(w/o bin)

H”xW”xD”
FME1204RS-32A 27 x 21 x 24 208-230/60/1 FLAKE Remote Air 14.1 20 208 ounces
FME1204RS-3A same 203-230/60/1 FLAKE Remote Air 11.2 15 208 ounces
NME954RS-32A same 208-230/60/1 NUGGET Remote Air 14.1 20 208 ounces
NME954RS-3A same 208-230/60/3 NUGGET Remote Air 11.2 15 208 ounces

Minimum Circuit Ampacity is used to determine wire size and type per National Electric Code.

Basic Electrical Ice Type Cond. Type Minimum

Water Inlet

3/8" Flare

5.25"

3"

Circuit
Ampacity

Maximum
Fuse Size

Refrigerant
Charge
(R-404A)

January 2005

Page 2

NME1254R & FME1504R

FOR THE INSTALLER: Remote Condenser

Installation Limitations:

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

Min. Max.
Air Temperature 50
Water Temperature 40

0

F 1000F

0

F 1000F
Water Pressure 20 psi 80 psi
Voltage 5% +10%

(Compared to the nameplate)
The temperature limitations do not apply to the

remote condenser. It will work between -20
degrees F, and 120 degrees F.

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

ERC DIMENSIONS

Model A B F G
ERC201 33
ERC402 43

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.

3

"10

8

3

"10

8

3

"16

4

3

"21

4

3

4

3

4

"11
"16

5

"

8

5

"

8

SPECIFICATIONS: REMOTE CONDENSER

Model Use with Basic Electrical
ERC201-32 1 FME1504R or 1

208-230/60/1

NME1254R

ERC402-32 1 or 2

208-230/60/1

FME1504Rs/NME1254Rs

RTE25 Precharged line set, 25’. R-404A
RTE40 Precharged line set, 40’. R-404A
* Two machines on one condenser require a fan relay kit.

23

19

13

"

16

7

"

8

Icemaker Nameplate Located On Back Panel

Serial Plate Located Behind Front Panel

January 2000

Page 3

NME1254R & FME1504R

FOR THE INSTALLER

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, usually a minimum of
6 inches. 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:

LEVEL THE ASSEMBLY

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 bin top if required, follow the
directions included with the bin top.

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.

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, left, and
right sides. Secure the machine to the bin
with the hardware provided with the
machine.

Remove the front panel and remove the
styrofoam shipping blocks from under the
gearmotor, the top of the ice chute, and
from between the gearmotor and the right
side panel.

GASKET

FASTEN THE MACHINE

TO THE BIN WITH THE

HARDWARE SUPPLIED

WITH THE ICEMAKER

January 2000

Page 4

Remote Condenser Location

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.

NME1254R & FME1504R

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

NME1254R & FME1504R

FOR THE INSTALLER: Remote Condenser Installation

Location:

Limited to a 40 foot or a 25 foot length of
precharged refrigerant tubing connecting the
icemaker to the remote condenser. The condenser
must be above or level with the icemaker.

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 icemaker, using the
junction box at the back of the icemaker.

PRECHARGED LINE ROUTING

CAUTION

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

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.

Note: spiral need not be as tight as illustrated.

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

REMOTE CONDENSER

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.

3. Route the refrigerant lines through the roof
opening.

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

building.

January 2000

Page 6

LOCATE REMOTE

CONDENSER

ABOVE ICEMAKER

SPIRAL

EXCESS

TUBING

INSIDE

BUILDING

FOR THE INSTALLER

NME1254R & FME1504R

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.

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

Clean and Lubricate Couplings

·

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.”

inch liquid line (schrader valve end) goes

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 definate increase in
resistance is felt (no threads should be showing).
Do NOT overtighten.

·

The ½ inch discharge line goes to the ice
maker fitting marked “discharge line.”

3

·

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.

SCHRADER VALVE

inch liquid line goes to the ice maker

8

NO SHRADER

TO REMOTE TO ICEMAKER

January 2000

Rotate Swivel Nut ¼ Turn More

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.

Page 7

NME1254R & FME1504R

FOR THE PLUMBER

CONFORM TO ALL APPLICABLE CODES

Water Inlet

The recommended water supply is cold water.
Use 3/8" O.D. copper tubing, connect to the 3/8"
male flare at the back of the cabinet. Install a hand
valve near the machine to control the water supply.

WATER

INLET

3/8" FLARE

HAND SHUT

OFF VALVE

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. 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.

Storage Bin: Install a separate drain line. Insulation
of this drain line is recommended.

CONNECT TO

COLD WATER

FIELD INSTALLED

ICEMAKER DRAIN

3/4" FPT

BIN DRAIN

3/4" FPT

FILTER

(OPTIONAL)

January 2000

Page 8

FOR THE ELECTRICIAN

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.

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.

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

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

The remote condenser must be wired to
the icemaker 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 rainproof 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.

NME1254R & FME1504R

REMOTE CONDENSER

WATERPROOF
(LIQUID TIGHT)

CONDUIT

ICEMAKER

JUNCTION BOX

POWER
SUPPLY

January 2000

Page 9

NME1254R & FME1504R

FOR THE INSTALLER: Completed Installation

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

ROOF

CUT-AWAY

INSULATED PRECHARGED

REFRIGERANT TUBING

January 2000

Page 10

NME1254R & FME1504R

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, and right 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 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 (under
and next to the gearmotor, and on top
of the ice chute) 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 icemaker and the
condenser been made?

13. Verify that the master switch is in
the OFF position.

14. Switch on the electrical power.

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

POWER SUPPLY?

PLUMBING?

DRAINS?

LEVELED?

January 2000

Page 11

NME1254R & FME1504R

START UP

Pre-Start Inspection

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

2. Check that the styrofoam shipping blocks under
the gearmotor, on top of the ice discharge chute,
and between the gearmotor and the right side
panel 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).

Start Up

4. Check that the refrigerant lines are properly
installed.

5. Check that the electrical power has been on for
at least 4 hours.

6. Check that the unit is installed correctly
according to the final check list on page 10.

1. Go through the pre-start 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. Open the King Valve.

4. 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 gearmotor starts.
B. After the gearmotor starts, the liquid line valve

will open, the pump down control will close and the
compressor will start.

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

The low side pressure may be 25 to 28 PSIG in
low condensing temperatures, and 35 to 40 PSIG
when in high condensing temperatures.

The discharge pressure will depend upon air and
water temperatures, but should be between 180 ­200 psig when in low condensing temperatures;
and 320 to 420 psig when in high condensing
temperatures.

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 Customer Evaluation and Warranty
Registration form, and mail it to Scotsman.

6. The unit should soon be making ice, if desired
the low side pressure can be checked, it should be
30 psig + or - 4 psig.

January 2000

Page 12

COMPONENT DESCRIPTION

NME1254R & FME1504R

Control Box: Contains the electrical controls that

operate the machine.
High Pressure Cut Out (control): An automatic

reset switch sensing the high side refrigeration
pressure. It is set to shut the machine off at 450
psig.

Pump Down Control: A switch to control the
compressor, depending upon low side pressure:
closes at 30 PSIG, and opens at 15 PSIG.

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.

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.

RESERVOIR

WATER LEVEL SENSOR

(INSIDE RESERVOIR)

COMPRESSOR

HIGH PRESSURE

CUT OUT

CONTROL BOX

ICE CHUTE

EXPANSION

VALVE

GEAR MOTOR

EVAPORATOR

CLEANING DRAIN

TUBE

January 2000

Page 13

ICE LEVEL SENSORS

NME1254R & FME1504R

COMPONENT DESCRIPTION: Control Box Components

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: 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.

Water OK Light

Power Light

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

Control Board

Service Light

Freeze Light

Bin Full

Light

LED1

Compressor

Relay

LED3

Auger

Relay

January 2000

Page 14

ELECTRICAL SEQUENCE:

NME1254R & FME1504R

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 interupts 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.

January 2000

Page 15

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 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.e, but it is not a service disconnect.

NME1254R & FME1504R

OPERATION: Water

Water

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

The water then goes out the bottom of the
reservoir tank to the bottom of the evaporator.
Reservoir overflow or evaporator condensation is
routed to the drain.

RESERVOIR

EVAPORATOR

DRAIN

Water Level: The correct water level should be

checked when the machine is making ice. Locate
the water level in the reservoir, and compare it to
he horizontal line molded into the side of the
reservoir.

The correct level should be between

1

" below the line. If needed, bend the float arm up

4

1

" above and

8

or down to adjust the water level.

WATER

INLET

WATER LEVEL

DRAIN

January 2000

Page 16

OPERATION: Refrigeration

NME1254R & FME1504R

Beginning at the compressor, the refrigerant is

compressed into a high temperature gas. The
discharge line directs this gas to the condenser
and to the head pressure control 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 liquid line
connection at the head pressure control. If the
head pressure is high enough the liquid refrigerant
will go through the valve and enter the receiver.
From the receiver, the liquid refrigerant flows
through the liquid line valve and then 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. At the
evaporator, the refrigerant enters an area of
relatively low pressure, where it can easily “boil off”
or evaporate. As it evaporates, it absorbs heat
from the evaporator and whatever is in contact with
it (such as the water inside it). After the
evaporator, the refrigerant, now a low pressure
vapor, goes through the suction line back to

compressor, where the cycle is repeated.

REMOTE CONDENSER

DISCHARGE

LINE

HEAD

PRESSURE

CONTROL

VALVE

LIQUID LINE

DETAIL OF HEAD

PRESSURE CONTROL

VALVE

LIQUID LINE

VALVE

THERMOSTATIC

EXPANSION

VALVE

EVAPORATOR

RECEIVER

COMPRESSOR

January 2000

Page 17

NME1254R & FME1504R

OPERATION: Refrigeration

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

DISCHARGE

LINE

LIQUID LINE

the receiver to maintain pressure until the head
pressure is built back up to 180 psig). At that
pressure the valve opens up the liquid line from the
condenser to the receiver.

REMOTE CONDENSER

DETAIL OF HEAD

PRESSURE CONTROL

VALVE

HEAD

PRESSURE

CONTROL

VALVE

RECEIVER

LIQUID LINE

January 2000

Page 18

VALVE

THERMOSTATIC

EXPANSION

VALVE

EVAPORATOR

COMPRESSOR

OPERATION: Refrigeration

DISCHARGE

LINE

NME1254R & FME1504R

REMOTE CONDENSER

LIQUID LINE

RECEIVER

LIQUID LINE VALVE

(CLOSED)

COMPRESSOR

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. At this

January 2000

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 pump down control opens
turning the compressor off.

Page 19

NME1254R & FME1504R

CLEANING and SANITATION

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.

Electrical power will be ON when doing in place
cleaning.

ICEMAKING SYSTEM: In place cleaning

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

2. Pull out and remove 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.

8. Slowly pour the cleaning solution into the water

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.

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, 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.

To Sanitize:
Repeat steps 8-11, except substitute an approved

sanitizing solution for the cleaning solution. A
possible sanitizing solution may be made by mixing
1 ounce of household bleach with 2 gallons of
warm (95

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

13. Switch the master switch to ON

14. Continue ice making for at least 15 minutes, to
flush out any cleaning solution. Check ice for acid
taste - continue icemaking until ice tastes sweet.

DO NOT USE any ice produced from the cleaning
solution.

Be sure no ice remains in the bin.

15. Remove all ice from the storage bin.

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

17. Sanitize the bin interior with an approved
sanitizer using the directions for that sanitizer.

18. Replace the front panel.

0

F. - 1150F.) water.

January 2000

Page 20

SENSOR MAINTENANCE:

NME1254R & FME1504R

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 remote condenser. Use a vacuum
cleaner or coil cleaner if needed.

Do NOT use a wire brush.

4. Check and tighten all bolts and screws.

January 2000

Page 21

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

NME1254R & FME1504R

BEARING MAINTENANCE

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

Switch the machine Off and check the bearing:

removing the ice chute cover

·

Chute Cover

unscrewing the ice sweep

·

Ice Sweep

unscrewing the auger stud

·

Auger Stud

Cap Screw

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

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

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

·

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

O

f

f

Breaker

Cover

Bearing

See Removal and Replacement section to replace
bearing or seals.

Reverse to reassemble.

Needle, pn
02-3559-01

January 2000

Page 22

AUGER MAINTENANCE

Hazardous Moving
Parts.

Moving auger can cause
personal injury.

Disconnect electrical
power before beginning.

In some areas the water supply to the icemaker 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.

The auger has sharp edges,
handle with gloves.

ALLEN

SCREWS

NME1254R & FME1504R

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.

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

2. Remove bail clip holding the ice chute cover to
the ice chute body, and remove the cover.

3. Unscrew and remove ice sweep.

4. Remove ice chute body from evaporator.

5. Remove 4 allen screws holding breaker to
evaporator.

6. Pull up on breaker to remove auger.
Allow the auger to dry, the stainless steel of the

auger and evaporator must be clean and bright.

Clean the auger and evaporator as required.

DO NOT HONE THE EVAPORATOR.

7. Replace the water seal.

8. Reverse to reassemble.
Remote Condenser:
Clean the fins of the remote condenser. Use a soft

brush or vacuum. Use coil cleaner if grease is
embeded in the fins.

BREAKER &
BEARING &

AUGER

ASSEMBLY

January 2000

Page 23

NME1254R & FME1504R

SERVICE DIAGNOSIS:

Symptom Possible Cause Probable Correction

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

Unit off due to master switch in Off
position

Unit off due to low water level 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

High or Low Pressure switch open

Circuit board gear motor relay will not
close

Water level or ice level sensor failed Check / replace sensor

Check / replace board

January 2000

Page 24

NME1254R & FME1504R

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 wter,
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 25

NME1254R & FME1504R

CONTROL SYSTEM DIAGNOSTICS

The control system consists of:

Control Board

·

Water Sensor

·

Ice Sensors

·

High Pressure Cut Out

·

Low Pressure Cut Out

·

If the unit is OFF, check the control board:

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

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

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

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

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

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

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

If it is on, the ice sensors may be blocked. Remove
them and check for mineral scale. Scotsman's test

box can also be used to determine if the ice
sensors or board are defective.

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

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

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

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

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

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

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

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

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

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

January 2000

Page 26

NME1254R & FME1504R

REMOVAL AND REPLACEMENT: Reservoir

WATER RESERVOIR

1. Shut off the water supply to the icemaker.

2. Remove front panel and reservoir cover.

3. Disconnect water inlet compression fitting at
reservoir inlet.

4. To remove float push locking tab in and pull float
valve up and out of the reservoir tank.

Note: there is a plunger inside the valve that is
available separately.

5. To remove reservoir, remove drain hose from
reservoir.

6. Remove evaporator inlet hose from reservoir.

7. Pull water sensor from reservoir.

8. Remove mounting screws from reservoir
bracket, and remove reservoir from icemaker.

9. Reverse to reassemble.

FLOAT

ASSEMBLY

Water

Sensor

ICE DISCHARGE CHUTE

SLIDE THE

SENSOR

HOLDERS LEFT

TO REMOVE

FROM THE 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 cube
chute.

January 2000

Page 27

NME1254R & FME1504R

REMOVAL AND REPLACEMENT: Bearing And Breaker

vice the bearing. Check for rust, rough spots and
damage.

a. The bearing is pressed into the breaker, to

Hazardous Moving
Parts.

Moving auger can cause
personal injury.

Disconnect electrical
power before beginning.

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

To Remove the Breaker Bearing Assembly:

1. Remove panels and disconnect electrical power.

2. Move bail clip off of ice chute cover 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

Step 5-a Step 5-b Step 5-c & Step 6

ICE SWEEP

BREAKE

R COVER

fr
o

m
a
u
g
er
&
e
v
a
p
or
at
or
.

6.
S
er

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.

AUGER

STUD

BREAKER

BEARING

SEALS

January 2000

Page 28

NME1254R & FME1504R

REMOVAL AND REPLACEMENT: Auger

d. Use a slide hammer type puller to pull on the
auger at the threaded hole. The size of that hole
is 5/8"-18.

Hazardous Moving
Parts.

Moving auger can cause
personal injury.

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. The top panel must be removed.

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.

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

BREAKER

ASSEMBLY

ALLEN

SCREWS

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.

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

SLIDE

HAMMER

PULLER

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.

January 2000

Page 29

NME1254R & FME1504R

REMOVAL AND REPLACEMENT: Evaporator & Water Seal

To Remove the Water Seal:

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

1. The gearmotor/evaporator assembly will have to
be pulled away from the machine (if not yet done).

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

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.)

REPLACING THE WATER SEAL

PLACE FOOD

GRADE SILASTIC

HERE

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 gearmotor.

WATER SEAL

RETAINING RING

January 2000

Page 30

NME1254R & FME1504R

REMOVAL AND REPLACEMENT: Evaporator

To Replace the Evaporator:

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

1. Recover the refrigerant from the ice 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”)
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”

To Reassemble the Evaporator and Auger

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

Head Pressure Control Valve

1. Recover 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 that 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..

January 2000

Page 31

NME1254R & FME1504R

REMOVAL AND REPLACEMENT: Gearmotor

D) After replacing parts as required, (if any)
reassemble the gearcase. The two smaller gears
and the oil should be in the lower case, the output

Electrical Shock
Hazard.

Electrical power can
cause personal injury.

Disconnect electrical
power before beginning.

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
gearmotor to the gearmotor plate.

3. Remove the gearmotor from the
icemaker.

gear will be with the cover. As you lower the cover
onto the lower case, cover will have to be moved
closer to the second gear after the output gear has
cleared the second gear top bearing.

E) After the case is together, and the locating pins
are secure in both ends, replace all cap screws.

4. Bench test the gearmotor, check for oil leaks,
noise, and amp draw.

To Inspect the gearmotor.

A) Remove the cap screws holding
the gearmotor 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. Replace as a unit.

C) Inspect the oil, gears, and
bearings. If the oil level and condition
is acceptable, quickly check the gears
and bearings. They are likely to be fine
if the oil is.

If there is evidence of water in the oil
(rusty bearings and gears; the oil
having a creamy white appearance; oil
level too high) carefully inspect the
bearings and gears. If in doubt about
the condition of a part, replace it. The
oil quantity is 14 fluid ounces, do not
overfill.

Note: The gears and bearings are
available only as pressed together
sets.

COVER

WATER

SHED

MOTOR

BEARING

FIRST GEAR

SECOND GEAR

GASKET

GEARCASE

January 2000

Page 32

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.

·

NME1254R & FME1504R

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.

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

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

CHARGING

CYLINDER or

SCALE

January 2000

Page 33

NME1254R & FME1504R

What to Do Before Calling for Service

If the machine is off, not making ice:

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

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

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

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

January 2000

Page 34