Page 1
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
Page 2
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
Page 3
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
Page 4
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
Page 5
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
Page 6
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
Page 7
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
Page 8
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
Page 9
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
Page 10
NME1254 & FME1504
Control Box
Contactor: A definite purpose contactor
connecting the compressor to the power supply.
Circuit Board: Controlling the ice machine
through sensors and relays. The sensors are for
ice level and water level. The relays are for the
gear motor (with a built in time delay to clear the
evaporator of ice when the unit turns off) and for
the compressor.
Potential Relay: The compressor start relay.
On/Off Switch: Manual control for the machine.
Water OK Light
Control Board
Power Light
Service Light
Freeze Light
Bin Full
Light
LED1
Compressor
Relay
LED3
Auger
Relay
June 2002
Page 10
Page 11
ELECTRICAL SEQUENCE:
NME1254 & FME1504
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 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 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 compressor will not restart 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 compressor 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 compressor is restarted
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.
·
If the low pressure cut out switch opens the
machine will stop immediately. It will
automatically reset when the pressure rises
above 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 11
Page 12
NME1254 & FME1504
COMPONENT DESCRIPTION
Evaporator: A refrigerated vertical tube filled
water and containing a water seal and auger.
Auger: A solid stainless steel double spiral auger,
it pushes the ice crystals up to the top of the
evaporator.
Water Seal: A two part “face” seal, the top half
rotating with the auger, the bottom half stationary,
the sealing action being where the two seal “faces”
meet.
Ice Sweep: A plastic cap with “fingers”. It revolves
with the auger to “sweep” the ice into the ice chute.
Breaker: Where the ice is compressed and much
of the extra water is squeezed out of it before it is
discharged into the bin.
BREAKER
Motor: A split phase motor that drives the gear
reducer.
Bearing: As the ice is pushed up the evaporator,
the auger is thrust down, and pressure from the
auger thrust is taken up by this bearing.
ICE
SWEEP
BEARING
AUGER
ICE CHUTE
WATER SEAL
ICE LEVEL
SENSORS
EVAPORATOR
June 2002
Page 12
DRIVE MOTOR
Page 13
OPERATION
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.
Water cooled models have a separate water circuit
for the cooling water: it enters the fitting at the rear,
goes to the water regulating valve, then to the
water cooled condenser and then down the drain.
NME1254 & FME1504
Note: The water level may be checked by comparing
the level of water in the reservoir to the line molded
into the side of the reservoir. The water level should
be between
The water level may be adjusted by bending the arm
1
" above and
8
of the float as needed.
1
" below the line.
4
RESERVOIR
ICE
CHUTE
EVAPORATOR
DRAIN
WATER LEVEL
EVAPORATOR
DRAIN
WATER SCHEMATIC
January 2000
Page 13
Page 14
NME1254 & FME1504
OPERATION: Refrigeration
Beginning at the compressor, the refrigerant is
compressed into a high temperature gas. The
discharge line directs this gas to the condenser. At
the condenser (air or water cooled) the gas is
cooled by either air or water and it then condenses
into a liquid. This high pressure liquid then goes
through the liquid line to the expansion valve.
The thermostatic expansion valve meters liquid
refrigerant into the evaporator, the volume of liquid
refrigerant depending upon the temperature of the
evaporator; warmer evaporators get more
refrigerant and colder evaporators get less.
REFRIGERATION SYSTEM SCHEMATIC
AIR COOLED
CONDENSER
At the evaporator, the refrigerant enters an area
of relatively low pressure, where it can easily
“boil off” or evaporate. As it evaporates, it
absorbs heat from the evaporator and whatever
is in contact with it (such as the water inside it).
After the evaporator, the refrigerant, now a low
pressure vapor, goes through the suction line
back to compressor, where the cycle is
repeated.
SUCTION LINE
FAN
MOTOR
DISCHARGE
LIQUID LINE
LINE
THERMOSTATIC
EXPANSION
VALVE
EVAPORATOR
COMPRESSOR
June 2002
Page 14
Page 15
NME1254 & FME1504
CLEANING & SANITIZING
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.
Cleaning, Sanitation and other Maintenance 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 Scale Remover
with three quarts of hot water. The water should be
between 90-115 degrees F.
Scotsman Scale
Remover contains
acids. These
compounds can 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.
To Sanitize:
Repeat steps 8-11, except use an approved
sanitizing solution in place of the cleaning solution.
A possible sanitizing solution may be made by
mixing 1 ounce of household bleach to 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.
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.
o
F. to 115oF.) water.
18. Replace the front panel.
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.
November 2007
Page 15
Page 16
NME1254 & FME1504
SENSOR and CONDENSER MAINTENANCE
1. The bin control is a device that senses light,
and 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 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 or replace the air cooled condenser
filter.Clean the air cooled condenser. Use a
vacuum cleaner or coil cleaner if needed.
Do NOT use a wire brush.
June 2002
Page 16
Clean the Probe's Tip with ice
machine cleaner and a clean,
soft cloth.
Page 17
BEARING MAINTENANCE
NME1254 & FME1504
The bearing in the breaker should also be checked
at least two times per year.
A. Check the bearing by:
removing the ice chute cover
·
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.
See Removal and Replacement section to replace
bearing or seals.
·
removing the water shed & unscrewing the
breaker cover (left hand threads).
Off
Needle, pn
02-3559-01
Breaker
Cover
Reverse to reassemble.
January 2000
Page 17
Page 18
NME1254 & FME1504
AUGER MAINTENANCE
Hazardous Moving
Parts.
Rotating auger can cause
personal injury.
Disconnect electrical
power before beginning
maintenance.
In some areas, the water supply to the Ice Machine
will contain a high concentration of minerals, and
that will result in an evaporator and auger
becoming coated with mineral scale, requiring a
more frequent removal than twice per year. If in
doubt about the condition of the evaporator and
auger, remove the auger so the parts can be
inspected.
Note: Water filters can filter out suspended solids,
but not dissolved solids. “Soft” water may not be
the complete answer. Check with a water
treatment specialist regarding water treatment.
For more information on removal of these
parts, see REMOVAL AND REPLACEMENT.
ALLEN HEAD
SCREWS
BREAKER &
BEARING &
AUGER
ASSEMBLY
Handle auger with care, it has sharp edges.
Turn off the water supply.
1. To remove the auger, remove the front and top
panels.
2. Push back bail clamp holding ice chute cover to
ice chute, and remove cover.
3. Unscrew and remove ice sweep.
4. Remove ice chute from evaporator.
5. Remove 4 allen screws holding breaker to
evaporator.
6. Drain the evaporator by lowering and uncapping
the evaporator drain hose.
7. Pull up to remove auger.
After the auger has been removed, allow the auger
to dry: if the auger is not bright and shiny, it must
be cleaned.
Clean the auger and evaporator as required. DO
NOT HONE THE EVAPORATOR.
8. Replace the water seal.
9. Reverse to reassemble.
June 2002
Page 18
Page 19
NME1254 & FME1504
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. Check water supply, filter, strainer,
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
Low pressure control open Auger not turning due to: motor
Switch master switch to ON.
float valve. Correct water supply.
Check/clean ice level sensors.
Clean water level sensor.
Check for water interruption (water
cooled) or fan motor failure (air
cooled).
yet shut unit down.
down due to high auger motor amp
draw. Check for cause of high amp
draw, including bearings, gearmotor
condition and scale on auger and in
evaporator.
failure; auger relay failure on circuit
board; or gears stripped. Check drive
train.
TXV restricted or not metering. Check
bulb temperature.
Lack of refrigerant. Check for leak.
Check for a restricted system
No power to circuit board. Check harness
Low or high pressure cut outs open
Circuit Board gear motor relay will not
close
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.
Circuit board compressor relay will
not close.
Check, replace board
Check start relay
Check compressor windings
Check, replace board
January 2000
Page 19
Page 20
NME1254 & FME1504
SERVICE DIAGNOSIS
Symptom Possible Cause Probable Correction
Water Leak Drain plugged up Clean out drain
Tubing cracked Replace tubing
Condensation on drain tubing Insulate tubing
Hose off Reattach hose
Reservoir cover off Return cover to reservoir
Reservoir cracked Replace reservoir
Evaporator water seal leaks Check base of evaporator & drip pan.
If the seal leaks, shut off the water,
remove the auger, replace the water
seal. Check gear motor for water
infiltration.
Excessive water use Water cooled model, water regulating
valve not adjusted properly.
Reservoir float valve leaks thru Replace float valve or seat
Water cooled model, overcharged
with refrigerant
Water cooled model, condenser
coated with minerals
Excessive ice meltage Bin drain clogged Clean out bin drain.
Improper installation of drains, they
are connected.
Poor fit between bin door and door
frame
Machine makes too much noise Evaporator coated internally with
minerals
Motor bearings dry Oil or replace motor
Adjust to 245 PSIG discharge
pressure
Recover and weigh refrigerant.
Weigh in correct charge.
Acid clean water cooled condenser.
Drains must be separate.
Adjust or replace
Clean with Scotsman Ice Machine
Cleaner
June 2002
Page 20
Page 21
CONTROL SYSTEM DIAGNOSTICS
NME1254 & FME1504
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.
January 2000
Page 21
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.
Page 22
NME1254 & FME1504
REMOVAL AND REPLACEMENT: Water Reservoir & Bin Control
WATER RESERVOIR
1. Shut off the water supply to the ice machine.
2. Remove front panel.
3. Remove reservoir cover.
4. Disconnect water inlet tube from reservoir inlet
fitting.
5. To remove float valve, push in “locking tabs” as
shown and pull float up.
Note: The plunger/seat is available separately as
a part.
6. To remove reservoir, pull up and remove water
sensor.
8. Disconnect water outlet tubes.
9. Remove mounting screws from reservoir
bracket, and remove reservoir from ice 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.
June 2002
Page 22
Page 23
NME1254 & FME1504
REMOVAL AND REPLACEMENT: Bearing And Breaker
Note: Removal of the auger, water seal, evaporator
and gearmotor must begin at the top of the
assembly.
Hazardous Moving
Parts.
Moving auger can cause
personal injury.
Disconnect electrical
power before beginning.
To Remove the Breaker Bearing Assembly:
1. Remove panels and disconnect electrical power.
2. Push back bail clamp and remove ice chute
cover.
3. Unscrew and remove ice sweep.
4. Remove insulation halves from outside of ice
chute, 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.
Note: Flaker parts are illustrated, nugget parts are similar.
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.
Step 5-a Step 5-b Step 5-c
ICE
SWEEP
AUGER
STUD
BREAKER
COVER
January 2000
Page 23
BEARING
SEALS
Page 24
NME1254 & FME1504
REMOVAL AND REPLACEMENT: Auger
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.
Hazardous Moving
Parts.
Moving auger can cause
personal injury.
Disconnect electrical
power before beginning.
2. Push bail clamp off of ice chute cover, remove
ice chute cover.
3. Unscrew ice sweep.
4. Remove ice chute body.
BREAKER
AND
AUGER
ASSEMBLY
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 and remove breaker from evaporator.
e. If the auger is stuck use a slide hammer type
puller to pull on the auger at the threaded hole.
The size of that hole is 5/8"-18.
5. The auger
and
breaker/bearing
may now be
removed as an
assembly.
a. Unscrew 4
allen head cap
screws holding
breaker to
evaporator.
b. Lift up on
breaker and
remove auger
from
evaporator.
Note: If the
auger is stuck,
the breaker
Inspect the auger, the critical areas of the auger
are:
1. The auger body. It should be clean and shining.
Sometimes an auger will appear clean when wet,
but after it is dry it will be seen to be stained.
Scrub the auger with ice machine cleaner and hot
water.
Ice machine cleaner is an acid. Handle it with
extreme care, keep out of the reach of children.
2. The water seal area. Because the auger has
been removed, the water seal will have to be
replaced. Remove the water seal top half from the
auger, and inspect the auger for minerals clean as
required.
SLIDE
HAMMER
PULLER
THREAD
INTO
AUGER
June 2002
Page 24
Page 25
NME1254 & FME1504
REMOVAL AND REPLACEMENT: Water Seal
REMOVAL OF THE 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 exposed.
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.)
WATER
SEAL
RETAINING
RING
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.
January 2000
Page 25
Page 26
NME1254 & FME1504
REMOVAL AND REPLACEMENT: Evaporator
To Replace the Evaporator:
(Assuming all the steps for removal of the thrust
REPLACING THE WATER SEAL
PLACE A BEAD OF
FOOD GRADE
SEALANT HERE
bearing, breaker, auger, and water seal have been
performed.)
1. Recover the refrigerant from the ice machine.
2. Unsweat the refrigerant connections:
a) At the thermostatic expansion valve outlet.
Heat sink the TXV body when unsweating or
resweating the adjacent tubing.
b) At the suction line at the joint about 3" from the
evaporator.
3. Remove the evaporator.
4. Unsweat the drier from the liquid line.
5. After installing a new water seal in the new
evaporator (see “To Replace the Water Seal”)
sweat in the new evaporator at the old
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 the Auger Into the Evaporator.
3. Complete the reassembly by reversing the
disassembly for the breaker & thrust bearing
assembly.
ROTATING HALF OF
WATER SEAL
June 2002
Page 26
Page 27
NME1254 & FME1504
REMOVAL AND REPLACEMENT: Gearmotor
check the gears and bearings. They are likely to be
fine if the oil appears normal.
If there is evidence of water in the oil (rusty
Electrical Shock
Hazard.
Electrical power can
cause personal injury.
Disconnect electrical
power before beginning.
To Check the Motor:
1. Remove wires from terminals 1 and 2.
2. Use an ohmmeter to check for continuity. If there
is none, replace the motor only. If there is
continuity, but the motor will not start, check the
motor's start switch.
3. Remove motor end bell or motor stator. With
ohmmeter wires attached to 1 and 2 move
centrifugal switch actuator up and down to simulate
motor speed. If the ohmmeter does not show any
change or shows and open circuit, replace the
switch or motor.
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.
To Inspect the gearmotor.
A) Remove the cap screws holding
the gearmotor case halves together
and pry the two cases apart.
B) Remove 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.
WATER
SHED
COVER
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.
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
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.
MOTOR
BEARING
FIRST GEAR
SECOND GEAR
GASKET
C) Inspect the oil, gears, and
bearings. If the oil level and
condition is acceptable, quickly
GEAR CASE
January 2000
Page 27
Page 28
NME1254 & FME1504
SCALE
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.
Sight Glass
Torque stem
to 6-8 ft.-lb.,
caps to 7-12
ft.-lb.
R-404A
Tank Must
Be in Liquid
Dispensing
Position Check Tank!
Instructions for Liquid Charging R-404A
In preparation for charging, the low side hose
should have a sight glass, and/or a restricting
device (such as a “Charge Faster”) installed in it for
metering liquid into the low side of the system.
1. After a thorough evacuation shut off the manifold
valves and switch off the vacuum pump.
2. Place a drum of R-404A onto an electronic
scale.
3. Attach the charging hose to the drum.
4. Open the valve on the drum and purge the
charging hose.
5. Zero out the scale.
6. Shut the low side access valve at the ice
machine.
7. Open the discharge manifold valve full open.
8. Watch the scale, when the correct charge is
shown, shut the manifold valve.
Note: If all of the charge will not “go in” the
discharge side:
A. Shut the discharge access valve at the ice
machine.
B. Switch the machine on.
C. Open the low side access valve at the ice
machine.
D. Open the low side manifold valve and observe
the sight glass to be certain that only gas is flowing
into the system.
E. When the proper charge is indicated on the
scale, shut off the manifold valve(s).
9. Shut off the valve on the refrigerant drum.
10. Re-open the manifold valves until all liquid has
flowed out of the hoses.
11. Shut the low side access valve on the ice
machine.
12. Remove hoses from ice machine and replace
all caps.
Hose Connection Schematic for Liquid Charging
June 2002
Page 28
Page 29
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.
NME1254 & FME1504
January 2000
Page 29
Loading...