Scotsman NME1254 SERVICE MANUAL
INTRODUCTION
NME1254 & FME1504
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.
Table of Contents
FOR THE INSTALLER ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Page 2
FOR THE INSTALLER: Environmental Limitations ,,,,,,,,,,,,,,,,,,,,, Page 3
FOR THE INSTALLER ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Page 4
FOR THE PLUMBER ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Page 5
FOR THE ELECTRICIAN ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Page 6
FOR THE INSTALLER: Final Check List ,,,,,,,,,,,,,,,,,,,,,,,,,,, Page 7
START UP ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Page 8
COMPONENT DESCRIPTION ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Page 9
Control Box ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Page 10
ELECTRICAL SEQUENCE: ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Page 11
COMPONENT DESCRIPTION ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Page 12
OPERATION ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Page 13
OPERATION: Refrigeration ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Page 14
CLEANING & SANITIZING ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Page 15
SENSOR and CONDENSER MAINTENANCE ,,,,,,,,,,,,,,,,,,,,,,,, Page 16
BEARING MAINTENANCE ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Page 17
AUGER MAINTENANCE ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Page 18
SERVICE DIAGNOSIS: ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Page 19
SERVICE DIAGNOSIS ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Page 20
CONTROL SYSTEM DIAGNOSTICS ,,,,,,,,,,,,,,,,,,,,,,,,,,,, Page 21
REMOVAL AND REPLACEMENT: Water Reservoir & Bin Control ,,,,,,,,,,,,, Page 22
REMOVAL AND REPLACEMENT: Bearing And Breaker ,,,,,,,,,,,,,,,,,, Page 23
REMOVAL AND REPLACEMENT: Auger ,,,,,,,,,,,,,,,,,,,,,,,,,, Page 24
REMOVAL AND REPLACEMENT: Water Seal ,,,,,,,,,,,,,,,,,,,,,,, Page 25
REMOVAL AND REPLACEMENT: Evaporator ,,,,,,,,,,,,,,,,,,,,,,, Page 26
REMOVAL AND REPLACEMENT: Gearmotor ,,,,,,,,,,,,,,,,,,,,,,,, Page 27
Refrigeration System Service ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Page 28
What to Do Before Calling for Service ,,,,,,,,,,,,,,,,,,,,,,,,,,,, Page 29
Both models feature: front service for the
evaporator, gearmotor, control box, water reservoir
and bin control; electronic circuitry for monitoring
ice and water level; a thermostatic expansion
valve; and R-404A as the refrigerant.
This manual was printed on recycled paper.
Keep it for future reference.
Note this symbol when it appears.
It marks a potential hazard.
January 2000
Page 1
NME1254 & FME1504
FOR THE INSTALLER
These machines are designed to fit the following
Scotsman storage bins:
SB480 and
·
extensions (with bin top KBT18)
HTB555 or BH550 - direct fit
·
BH800 using bin top KBT23
·
BH801 using bin top KBT29
·
BH900 using bin top KBT22
·
NME1254 Dispenser Applications
The NME1254 can be placed on and used with
certain ice and ice-beverage dispensers. Kits
are required for proper operation.
ID200 or ID250, use adapter KBT44 and
·
KNUGDIV and KDIL-N-ID2
Cornelius ED/DF200 beverage
·
dispensers, use KBT44 and KDIL-N-200
Cornelius ED/DF250 beverage dispensers, use
·
KBT44 and KDIL-N-250
Lancer special-for-nugget Ice Beverage
·
Dispenser, use KDIL-N-L & Lancer kit #82-3491
ICE MACHINE SPECIFICATIONS
Model Number Cabinet
Dimensions
W"xD"xH"
FME1504AS-32B 30 x 24 x 27 208-230/60/1 Air Cooled Flake 36 ounces 15.0 20
FME1504WS-32B 30 x 24 x 27 208-230/60/1 Water Cooled Flake 24 ounces 14.3 20
NME1254AS-32B 30 x 24 x 27 208-230/60/1 Air Cooled Nugget 36 ounces 15.0 20
NME1254WS-32B 30 x 24 x 27 208-230/60/1 Water Cooled Nugget 24 ounces 14.3 20
Minimum circuit ampacity is used to determine wire size per National Electric Code.
Basic
Electrical
Condenser Type Ice Type Refrigerant
Charge
(R-404A)
January 2005
Page 2
Minimum
Circuit
Ampacity
Maximum
Fuse Size
NME1254 & FME1504
FOR THE INSTALLER: Environmental Limitations
Installation Limitations:
This ice system is designed to be installed indoors,
in a controlled environment:
Min. Max.
Air Temperature 50
Water Temperature 40
Water Pressure 20 psi 80 psi
Voltage 198 253
(Compared to the nameplate)
Operating the machine outside of the limitations is
misuse and can void the warranty.
0
F 1000F
0
F 1000F
Water Limitations
An ice machine makes food. The purity of the
water is very important in obtaining pure ice and in
maximizing product life.
General Recommendations:
1. Filter the water used to produce ice (the water
going to the potable water connection). Water
filters vary in ability and function. Install one that
filters out suspended solids to a dimension of 5
microns or smaller. The finer the filter the better,
but finer filters will clog sooner than course ones. It
may be necessary to add a course filter ahead of
the fine filter to prolong filter life.
2. Check with a water treatment specialist for a
water test, and recommendations regarding filters
and treatment.
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.
January 2000
Page 3
NME1254 & FME1504
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,
and minimum of 6" be allowed to the left,
right and top for air circulation on air
cooled models. Try to avoid hot, dirty
and crowded locations. Be sure that the
location for the machine is within the
limitations described on page 3.
Storage Bin
Tip the storage bin on its back, using
parts of the carton to protect the exterior
finish. Install the legs into the threaded
holes in the bottom of the bin. Turn the
leg levelers all the way in preparation for
leveling later. Return the bin to the
upright position, remove paper covering
the bin gasket.
Install bin top if required.
Level The
Assembly
Gasket
Note: Do not push bin into position,
instead lift it there. Pushing a bin,
especially one with ice in it, can cause
damage to the legs and the leg mounts.
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, left, and right sides. Secure the
machine to the bin with the hardware
provided with the machine.
Fasten The Machine To
The Bin With The
Hardware Supplied With
The ice machine
June 2002
Page 4
FOR THE PLUMBER
CONFORM TO ALL APPLICABLE CODES
NME1254 & FME1504
Water Inlet
Air Cooled Models: Connect a water supply of
cold, potable water. Use 3/8" O.D. copper tubing
to 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 Cooled
Connections
Water Inlet
3/8" Flare
Hand Shut
Off Valve
Connect To
Cold Water
Air Cooled Models: Connect a drain tube to the
3/4" FPT drain fitting at the back of the cabinet. It
is a gravity drain, 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.
Water Cooled Models: In addition to the above
Use only 3/4" rigid tubing.
Filter, Field
Installed
(Optional)
Water Cooled Models: Connect a separate 3/8"
O.D. copper line with a separate hand valve to the
3/8" FPT condenser inlet at the back of the cabinet.
The water pressure to all lines must always be
above 20 psig, and below 80 psig.
Drains
Ice Machine
Drain
3/4" FPT
Bin Drain
3/4" FPT
mentioned drain, a separate condenser drain must
be installed. Connect it to the 1/2" condenser drain
connection at the back of the cabinet.
Storage Bin: A separate gravity type drain needs
to be run, similar to the air cooled drain.
Insulation of this drain line is recommended.
January 2000
Page 5
NME1254 & FME1504
FOR THE ELECTRICIAN
CONFORM TO ALL APPLICABLE CODES
Connect the electrical power to the power leads 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.
Connect the ice machine to its own electrical circuit
so it is individually fused.
Voltage variation must remain within design
limitations, even under starting conditions.
Power
Supply
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.
Ice Machine
Junction Box
THIS UNIT MUST BE
GROUNDED
June 2002
Page 6
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?
Power
Supply?
Leveled?
NME1254 & FME1504
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. Have the shipping blocks been removed
from under the gearmotor, the top of the ice
chute, and from between the gearmotor and
the right side panel?
Plumbing?
Machine
Secure To
Bin?
Drains?
January 2000
Page 7
NME1254 & FME1504
START UP
Pre-Start Inspection
1. Remove the front, and left 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 (air cooled).
4. Check that the unit is installed correctly
according to the final check list (page 8).
Start Up
1. Go through the prestart inspection.
2. Open the hand valve, observe that water enters
the water reservoir, fills the tube from the reservoir
to the evaporator, and then shuts off. Check for
leaks.
3. Switch the master switch on.
The electrical start up sequence is now on
automatic.
A. There should be a short (15 second) delay
before the gearmotor starts.
B. After the gearmotor starts, the compressor will
start.
4. On air cooled models, the condenser will begin
to discharge warm air, on water cooled models, the
water regulating valve will open, and warm water
will be discharged into the drain.
5. The unit should soon be making ice, if desired,
the low side pressure can be checked: it should be
between 30 and 32 psig. Low side pressure may
be lower than 30 PSIG when the ambient is under
o
F. and higher than 32 when ambient is over
70
o
F.
90
The suction line temperature at the compressor is
normally very cold, nearly to the point of frost up to
the compressor body, but not on it.
The air cooled discharge pressure will depend
upon air and water temperatures, but should be
between 220 psig and 330 psig.
The water cooled discharge pressure should be
constant at about 245 psig.
The above numbers are for new, clean machines,
you can expect to see some values higher, and
some lower between different units.
6. THERE ARE NO ADJUSTMENTS TO MAKE,
so replace the panels.
7. Clean and/or sanitize the storage bin interior,
wipe off the exterior with a clean, damp cloth.
8. Give the owner/user the service manual, instruct
him/her in the operation of the unit, and make sure
they know who to call for service.
9. Fill out the Customer Evaluation and
Registration form, and mail it to Scotsman.
June 2002
Page 8
COMPONENT DESCRIPTION
NME1254 & FME1504
Control Box: Contains the electrical controls that
operate the machine.
Low Pressure Cut Out: An automatic reset switch
set to shut the machine off should the low side
pressure go below 15 PSIG.
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.
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 made by the
evaporator into the storage bin.
Control Box
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.
Condenser: Air or water cooled, where the heat
removed in ice making is discharged.
Expansion valve: The refrigerant metering
device.
Reservoir
Water Level Sensor
(Inside Reservoir)
Compressor
High Pressure
Cut Out
Condenser
Ice Chute
Expansion
Valve
Evaporator
Cleaning Drain
Tube
Gearmotor
Ice Level Sensor
January 2000
Page 9
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