Page 1
INTRODUCTION
NME454, 654 & FME504, 804
To the owner or user: The service manual you are
reading is intended to provide you, and the
maintenance or service technician, with the
information needed to install, start up, clean,
maintain, and service this ice system.
This is a modular ice system that fits a variety of
Scotsman ice storage bins.
Table of Contents
FOR THE INSTALLER ······································ Page 2
SAMPLE BIN AND MACHINE COMBINATIONS ························· Page 3
FOR THE INSTALLER ······································ Page 4
FOR THE INSTALLER: Location ································· Page 5
FOR THE PLUMBER ······································· Page 6
FOR THE ELECTRICIAN ····································· Page 7
FOR THE INSTALLER ······································ Page 8
INITIAL START UP ········································ Page 9
COMPONENT DESCRIPTION ·································· Page 10
COMPONENT DESCRIPTION ·································· Page 11
CONTROL BOX COMPONENTS ································ Page 12
ELECTRICAL SEQUENCE: ··································· Page 13
OPERATION: Water ······································· Page 14
OPERATION: Refrigeration ··································· Page 15
OPERATION: Performance ··································· Page 16
CLEANING & SANITIZING ···································· Page 17
SENSOR MAINTENANCE ···································· Page 18
AIR COOLED MAINTENANCE ·································· Page 19
BEARING MAINTENANCE ···································· Page 20
AUGER MAINTENANCE ····································· Page 21
SERVICE DIAGNOSIS ······································ Page 22
SERVICE DIAGNOSIS ······································ Page 23
CONTROL SYSTEM DIAGNOSTICS ······························ Page 24
REMOVAL AND REPLACEMENT: Bin Controls ························· Page 25
REMOVAL AND REPLACEMENT: Bearing And Breaker ···················· Page 26
REMOVAL AND REPLACEMENT: Auger ···························· Page 27
REMOVAL AND REPLACEMENT: Water Seal ························· Page 28
REMOVAL AND REPLACEMENT: Evaporator ·························· Page 29
REMOVAL AND REPLACEMENT: Gear Reducer and Motor ·················· Page 30
REFRIGERATION SYSTEM SERVICE ····························· Page 31
WHAT TO DO BEFORE CALLING FOR SERVICE ······················· Page 32
Its features include: front service for the freezer,
gearmotor, control box, water reservoir, and bin
control; an electronic control (AutoSentryä) for
monitoring ice level, water level and drive motor
current; a thermostatic expansion valve; and
R-404A as the refrigerant.
January 2007
Page 1
Note this symbol when it appears.
Page 2
NME454, 654 & FME504, 804
FOR THE INSTALLER
These machines fit the following Scotsman
products, check sales literature for other possible
combinations:
SB480 and extensions (with bin top KBT18)
·
B530 using bin top KBT14 or KBT20
·
B842 using bin top KBT28
·
B948 using bin top KBT24
·
NME654 Dispenser Applications
The NME654 can be placed on and used with
certain ice and ice-beverage dispensers. Kits are
required for proper operation, see the following list:
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 ice & beverage dispenser, use
·
KDIL-N-L and Lancer kit #82-3491.
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 (for 115v model) 104 126
(Compared to the nameplate)
Operating the machine outside of the limitations is
misuse and can void the warranty.
0
F 1000F
0
F 1000F
SPECIFICATIONS: ICE MACHINE
Model
Number
FME504AS-1 A 27" x 21" x 24" 115/60/1 Flake Air 15.75 20 22 ounces
FME504WS-1 A same same Flake Water 14.35 20 18 ounces
FME804AS-1 A or B same same Flake Air 19.5 30 24 ounces
FME804WS-1 A same same same Water 18.3 30 20 ounces
FME804WS-1 B same same same Water 18.3 30 19 ounces
FME804AS-6 A or B same 230/50/1 same Air 10.1 15 24 ounces
FME804WS-6 A same same same Water 9.5 15 20 ounces
FME804WS-6 B same same same Water 9.5 15 19 ounces
FME804AS-32 B same 208-230/60/1 Flake Air 10.2 15 20 ounces
FME804WS-32 B same same Flake Water 10.2 15 19 ounces
NME454AS-1 A same 115/60/1 Nugget Air 15.75 20 22 ounces
NME454WS-1 A same 115/60/1 same Water 14.35 20 18 ounces
NME654AS-1 A or B same same same Air 19.5 30 24 ounces
NME654WS-1 A same same same Water 18.3 30 20 ounces
NME654WS-1 B same same same Water 18.3 30 19 ounces
NME654AS-6 A or B same 230/50/1 same Air 10.1 15 24 ounces
NME654WS-6 A same same same Water 9.5 15 20 ounces
NME654WS-6 B same same same Water 9.5 15 20 ounces
Model
Series
Dimensions Basic
Electrical
Ice
Type
Condenser
Type
Minimum
Circuit
Ampacity
Max.
Fuse
Size
Refrigerant
Charge:
R-404A
Note: Minimum Circuit Ampacity is used to determine wire size and type per national electric code.
April 2008
Page 2
Page 3
NME454, 654 & FME504, 804
SAMPLE BIN AND MACHINE COMBINATIONS
FME804 ON BH550*
NME654 ON BH801*
The Nameplate is located on
the back of the machine.
A Serial Number Plate is
located inside the cabinet,
behind the front panel.
*Bin Top Kit Required
January 2007
Page 3
Page 4
NME454, 654 & FME504, 804
FOR THE INSTALLER
Location:
Install the machine be installed in a location where
it has enough space around it to be accessible for
service. A minimum of 6" must be allowed at the
back and sides 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 environmental limitations.
Storage Bin:
Tip the storage bin on its back, using parts of the
carton to protect the exterior finish. Install the legs
into the threaded holes in the bottom of the bin.
Turn the leg levelers all the way in preparation for
leveling later. Return the bin to the upright
position, remove paper covering the bin gasket.
Note: Do not push bin into position, but lift it there.
Pushing a bin, especially one with ice in it, can
cause damage to the legs and the leg mounts.
Install the appropriate bin top on the bin, according
to the instructions for the bin top.
Ice Machine:
The machine is heavy, so the use of a mechanical
lift is recommended for lifting the machine high
enough to install on top of the bin. After the unit is
placed on the bin, line it up so it is even with the
back side. Secure the machine to the bin with the
hardware provided with the machine.
Remove the front panel and remove any shipping
blocks.
Note: When placing 2 of these machines on a
BH801 without the bin top, removal of the 2 service
panels facing each other will make future service
easier:
1. Remove the 2 top panel screws that will face
each other.
2. Remove the 2 service panels that will face each
other.
3. Add a strip of gasket, such as Scotsman part
number 19-0503-04, to the 2 base edges that will
face each other and around service panel space
on the 2 panels that will face each other.
When the 2 machines are placed on the bin, the
gaskets will seal the bin top area and the space
between the machines.
Water Limitations:
An ice machine is a food manufacturing plant: it
takes a raw material, water, and transforms it into
a food product, ice. The purity of the water is very
important in obtaining pure ice and in maximizing
product life. This section is not intended as a
complete resource for water related questions, but
it does offer these general recommendations:
1. Check with a water treatment specialist for a
water test, and recommendations regarding filters
and treatment.
2. In most cases, the water used to make ice
should be filtered or treated, depending upon the
water. There is no one type of water filter that is
effective in all situations. That is why a water test is
important.
RO Water Limitation: Water conductivity must be
no less than 35 microSiemens/cm.
Note:
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 2007
Page 4
Page 5
FOR THE INSTALLER: Location
TWO UNITS ON ONE BIN
ALLOW ROOM
FOR AIR
CIRCULATION
AND SERVICE
ACCESS
NME454, 654 & FME504, 804
ALLOW AIR SPACE ON BOTH
SIDES
March 2006
Page 5
Airflow Notice:
Airflow changed in 2006.
Prior model's air flow was in the front
and out the back.
Current model's (shown) air flow is in
the sides and out the back.
Page 6
NME454, 654 & FME504, 804
FOR THE PLUMBER
CONFORM TO ALL APPLICABLE CODES
Water Inlet
Air Cooled Models: Use
connect cold potable water to the
fitting at the back of the cabinet. Install a hand
valve near the machine to control the water supply.
Water Treatment: In most areas, a water filter of
some type will be useful. In areas where the water
is highly concentrated with minerals the water
should be tested by a water treatment specialist,
and the recommendations of the specialist
regarding filtration and/or treatment should be
followed.
Water Cooled Models: Connect a separate
O.D. copper line, with a separate hand valve, to
3
the
" FPT condenser inlet at the back of the
8
cabinet. The water pressure to all lines must
always be above 20 PSIG, and below 80 PSIG.
3
" O.D. copper tubing to
8
3
" male flare
8
3
8
"
Drains
Air Cooled Models: Connect a drain tube to the
¾" FPT drain at the back of the cabinet, the drain
line is of the gravity type, and ¼ 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 ¾" rigid tubing.
Water Cooled Models: In addition to the above
mentioned drain, a separate condenser drain must
be installed. Connect it to the ½" condenser drain
connection at the back of the cabinet.
Storage Bin: Install a separate gravity type drain,
similar to the air cooled drain. Insulation of this
drain line is recommended.
WATER
COOLED
CONDENSER
HAND
VALVE
INLET
WATER
FILTER
CONDENSER
DRAIN
VENTED
DRAIN
HAND
VALVE
WATER
INLET
VENTED
AIR COOLED
MODELS
FIELD
SUPPLIED
FILTER
January 2007
Page 6
Page 7
FOR THE ELECTRICIAN
CONFORM TO ALL APPLICABLE CODES
NME454, 654 & FME504, 804
Connect the electrical power to the machine to the
wires in the junction box at the rear of the machine.
Check the nameplate (located on the back panel)
for the voltage requirements, and for the minimum
circuit ampacity. The machine requires a solid
chassis to earth ground wire.
WATER
COOLED
The ice machine should be connected to its own
electrical circuit so it would be individually fused.
Voltage variation must remain within design
limitations, even under starting conditions.
All external wiring must conform to national,
state, and local electrical codes. The use of a
licensed electrician is required to perform the
electrical installation.
POWER
SUPPLY
AIR
COOLED
January 2007
Page 7
Page 8
NME454, 654 & FME504, 804
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
back of the machine for proper service
access and air circulation?
6. Is the water pressure a minimum of 20
PSIG?
7. Has the machine been secured to the bin?
8. Is there clearance over the top of the
machine for service access?
9. Is there a water shut off valve installed near
the machine?
10. Have all of the shipping blocks been
removed?
January 2007
Page 8
Page 9
INITIAL START UP
NME454, 654 & FME504, 804
Pre-Start Inspection
1. Remove the front and side service panels.
2. Check that any shipping blocks have been
removed.
3. Inspect the interior of the machine for loose
screws or wires. Check that no refrigerant lines
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. There will be a
short delay before the gearmotor and 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.
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).
The air cooled discharge pressure will depend
·
upon air and water temperatures, but should be
between 220 PSIG and 300 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.
5. The unit should soon be making ice, if desired,
the low side pressure can be checked: it should be
34 PSIG + or - 4 PSIG.
The suction line temperature at the compressor is
normally very cold, nearly to the point of frost up to
the compressor body, but not on it.
January 2007
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 manufacturer’s registration and mail
it to Scotsman.
Page 9
Page 10
NME454, 654 & FME504, 804
COMPONENT DESCRIPTION
Control Box: Contains the electrical controls that
operate the machine.
High Pressure Cut Out Switch: An automatic
reset switch sensing the high side refrigeration
pressure. It is set to shut the machine off if the
discharge pressure should ever exceed 450 PSIG.
Low Pressure Cut Out Switch
An automatic reset control that shuts off the ice
machine when the low side pressure drops below
a preset point, 15 PSIG.
Compressor: The refrigerant vapor pump.
Reservoir: Float operated, it maintains the water
level in the evaporator at a constant level, it also
contains the water level sensor.
Water Level Sensor: Senses if there is water in
the reservoir to make ice out of. Will shut the
machine off it there is no
water.
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.
Condenser: Air or water cooled, where the heat
removed in ice making is discharged.
Expansion valve: The refrigerant metering device.
AIR COOLED
CONTROL BOX
RESERVOIR
EXPANSION
CONDENSER
VALVE
DRAIN
TUBE
ICE CHUTE
COMPRESSOR
January 2007
ICE LEVEL
SENSORS
Page 10
Page 11
COMPONENT DESCRIPTION
NME454, 654 & FME504, 804
Evaporator: A refrigerated vertical tube filled with
water and containing a water seal and auger.
Auger: A solid stainless steel double spiral auger,
it pushes the ice crystals up to the top of the
evaporator.
Water Seal: A two part “face” seal, the top half
rotating with the auger, the bottom half stationary,
the sealing action being where the two seal “faces”
meet.
Ice Sweep: A plastic cap with “fingers”. It revolves
with the auger to “sweep” the ice into the ice chute.
Breaker: Where the ice is compressed and much
of the extra water is squeezed out of it before it is
discharged into the bin.
Motor: The motor that drives the gear reducer
and auger.
Thrust Bearing: As the ice is pushed up the
evaporator, the auger is thrust down, and pressure
from the auger thrust is taken up by this bearing.
ICE SWEEP
BEARING
BREAKER/DIVIDER
WATER
SEAL
AUGER
EVAPORATOR
January 2007
Page 11
MOTOR
Page 12
NME454, 654 & FME504, 804
CONTROL BOX COMPONENTS
Contactor: A definite purpose contactor
connecting the compressor to the power supply.
AutoSentryÔ Control Board
The control board receives input signals from
several sensors and translates them to control the
electrical power supply to the various loads.
The sensors include:
Electric eyes to check the ice level in the bin.
·
Conductivity probe to determine if there is water
·
in the reservoir.
Current meter to measure the amp draw of the
·
auger drive motor.
Water OK Light
The loads include:
·
·
The control board also includes several indicator
lights.
Potential Relay: The compressor start relay.
On/Off (mode) Switch: Manual control for the
machine.
Control Board
Compressor contactor
Auger drive motor
Power Light
Service Light
Freeze Light
Bin Full
Light
LED1
Compressor
Relay
LED3
Auger
Relay
January 2007
Page 12
Page 13
ELECTRICAL SEQUENCE:
NME454, 654 & FME504, 804
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 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.
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 electrical
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.
·
January 2007
Page 13
The mode (on - off) switch is the manual
control for the complete machine, but it is not a
service disconnect.
Page 14
NME454, 654 & FME504, 804
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 down the drain.
EVAPORATOR
DRAIN
Water Level: The correct water level should be
checked when the machine is making ice. Check the
water level in the reservoir and compare it to the
horizontal line molded into the side of the reservoir.
1
The correct level should be between
below the line. If needed, bend the float arm up or
down to adjust the water level.
" above and
8
1
"
4
RESERVOIR
DRAIN
WATER LEVEL
EVAPORATOR
ICE
CHUTE
WATER SCHEMATIC
January 2007
Page 14
Page 15
OPERATION: Refrigeration
NME454, 654 & FME504, 804
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.
CONDENSER
LIQUID
LINE
FAN
MOTOR
DISCHARGE
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.
Refrigeration Schematic
SUCTION LINE
LINE
EVAPORATOR
THERMOSTATIC
EXPANSION
VALVE
COMPRESSOR
GEAR
MOTOR
January 2007
Page 15
Page 16
NME454, 654 & FME504, 804
OPERATION: Performance
Typical Low Side Pressure
Air Cooled: 34 - 38 PSIG
·
Water Cooled: 32 PSIG
·
Typical Discharge Pressure
Air Cooled: 220 - 300 PSIG
·
Water Cooled: 245 PSIG
·
Typical Compressor Amp Draw
8-9
·
Typical Auger Drive Motor Amp Draw (115
volt)
3.1 to 3.5 - Emerson
·
4to4.5-GE
·
Superheat
5 - 7 degrees
·
High Pressure Cut Out - automatic reset
450 PSIG
·
Low Pressure Cut Out - automatic reset
· 15 PSIG
Fan Motor Watts
·
35 Watt
January 2007
Page 16
Page 17
NME454, 654 & FME504, 804
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.
Maintenance and Cleaning should be scheduled at a minimum of twice per year.
Note: Electrical power will be ON when doing in
place cleaning.
ICE MAKING SYSTEM: In place cleaning
1. Check and clean any water treatment devices,
if any are installed.
2. Remove screws and the front and top panels.
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 water should be
between 90-115 degrees F.
Scotsman Ice Machine
Cleaner contains acids.
These compounds may
cause burns.
If swallowed, DO NOT
induce vomiting. Give
large amounts of water or
milk. Call Physician
immediately. In case of
external contact, flush
with water.
KEEP OUT OF THE
REACH OF CHILDREN.
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 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. 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. Wash and rinse
the water reservoir.
Sanitizing:
To sanitize, use an approved sanitizing solution or
mix one ounce of household bleach to 2 gallons of
warm (95
using the sanitizer solution in place of the cleaning
solution.
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.
18. Replace the panels.
o
F.-115oF.) water. Repeat steps 8-11
January 2007
Page 17
Page 18
NME454, 654 & FME504, 804
SENSOR MAINTENANCE
1. The bin control is a device that senses light,
therefore it must be kept clean so it 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 LEVEL SENSORS
SLIDE TO REMOVE
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.
CLEAN THE
LIGHT SENSORS
Clean the Probe's Tip with ice
machine cleaner and a clean,
soft cloth.
January 2007
Page 18
Page 19
AIR COOLED MAINTENANCE
Hazardous Moving
Parts.
Moving fan blade can
cause personal injury.
Disconnect electrical
power before beginning.
Clean the air cooled condenser.
The air flow on this model is from front to back, so
the inside of the machine will have to be available
to clean the air cooled condenser. Use a vacuum
cleaner or coil cleaner if needed. Do NOT use a
wire brush.
A. Disconnect electrical power, and remove the
filter. The filter may be cleaned or replaced.
B. Clean the condenser: the condenser may
appear to be clean on the surface, but it can still be
clogged internally. Check with a flash light from the
front to see if light can be seen though the
condenser fins. Reverse to reassemble.
NME454, 654 & FME504, 804
Step 2: Remove the top portion of the fan shroud.
Step 1: Remove the top panel.
Step 3: Clean the condenser.
January 2007
Page 19
Page 20
NME454, 654 & FME504, 804
BEARING MAINTENANCE
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
Breaker
Cover
January 2007
Bearing
Reverse to reassemble.
Page 20
Needle, pn
02-3559-01
Page 21
AUGER MAINTENANCE
NME454, 654 & FME504, 804
In some areas, the water supply to the ice maker
will contain a high concentration of minerals, and
that will result in an evaporator and auger
becoming coated with these minerals, requiring a
more frequent removal than twice per year. If in
doubt about the condition of the evaporator and
auger, the auger can be removed so the parts can
be inspected.
Note: Water filters can filter out suspended solids,
but not dissolved solids. “Soft” water may not be
the complete answer. Check with a water
treatment specialist regarding water treatment.
For more information on removal of these parts,
see REMOVAL AND REPLACEMENT.
1. To remove the auger, remove the front and top
panels.
2. Push bail clamp back from the top of the chute
cover.
3. Unscrew and remove ice sweep.
ICE SWEEP
4. Remove 4 allen screws holding breaker to
evaporator.
5. 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.
FME Components
Shown, NME similar.
ALLEN
SCREWS
BREAKER &
BEARING &
AUGER
ASSEMBLY
FME Components
Shown, NME similar.
7. Replace the water seal.
8. Reverse to reassemble.
BREAKER
COVER
January 2007
Page 21
Page 22
NME454, 654 & FME504, 804
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
No power to circuit board. Check harness
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.
Unit makes ice, but very slowly. High discharge pressure because of a
dirty condenser
Low capacity because the auger and
evaporator are coated with mineral
scale
Low suction pressure due to low
refrigerant charge
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 cool).
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
Hi or low pressure cut outs open
Check, replace board
Check start relay
Check compressor windings
Check, replace board
Clean the air filter and condenser.
Clean the water system
Locate leak. Recover refrigerant,
repair leak, replace dryer, evacuate
and weigh in the nameplate charge
January 2007
Page 22
Page 23
NME454, 654 & FME504, 804
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
January 2007
Page 23
Page 24
NME454, 654 & FME504, 804
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 2007
Page 24
Page 25
NME454, 654 & FME504, 804
REMOVAL AND REPLACEMENT: Bin Controls
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.
SLIDE BIN
CONTROLS
LEFT AND
RIGHT
ICE
CHUTE
RESERVOIR
1. Shut off water supply.
2. Remove front panel.
3. Remove reservoir cover.
4. Disconnect water inlet tube from reservoir inlet
fitting.
5. To remove float valve, push in on “Locking Tab”
as shown and pull valve up.
Note: The plunger/seat is available as a separate
part.
6. To remove reservoir, pull up and remove water
sensor.
7. Disconnect water outlet tubes.
8. Remove the two screws holding reservoir to
bracket.
9. Remove reservoir from ice machine.
10. Reverse steps 1-9 to reassemble.
FLOAT
ASSEMBLY
LOCKING
TABS
Water
Sensor
January 2007
Page 25
Page 26
NME454, 654 & FME504, 804
REMOVAL AND REPLACEMENT: Bearing And Breaker
6. Service 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 gear reducer must begin at the top
of the assembly.
To Remove the Breaker Bearing Assembly:
1. Remove panels and disconnect electrical power.
2. Pull the bail clamp off of the chute cover.
3. Unscrew and remove ice sweep.
4. Lift up and remove ice chute.
5. The breaker may be removed from the auger
and evaporator without disturbing the auger.
a. Unscrew breaker cover from breaker (left hand
threads)
b. Unscrew auger stud from top of auger.
c. Unscrew 4 allen head cap screws holding
breaker to evaporator.
d. Lift up, and remove breaker/bearing assembly
from auger & evaporator.
FME Components Shown, NME similar.
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 and Step 6
BEARING
ICE
SWEEP
AUGER
STUD
BREAKER
COVER
SEALS
January 2007
Page 26
Page 27
NME454, 654 & FME504, 804
REMOVAL AND REPLACEMENT: Auger
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.
Hazardous Moving
Parts.
Moving auger can cause
personal injury.
Disconnect electrical
power before beginning.
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.
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. Remove bail clip and remove ice chute cover.
3. Unscrew ice sweep.
4. Remove ice chute body.
5. The auger and breaker/bearing may now be
removed as an assembly.
a. Unscrew 4
allen head cap
screws holding
breaker to
evaporator.
b. Lift up on
breaker and
remove auger
from
evaporator.
Note: If the
auger is
stuck, the
breaker must
be removed
from the
auger.
The breaker
may be
removed from
the auger and
evaporator without disturbing the auger.
a. Unscrew breaker cover from breaker (left hand
threads)
b. Unscrew auger stud from top of auger.
c. Unscrew 4 allen head cap screws holding
breaker to evaporator.
d. Lift up & remove breaker from evaporator.
BREAKER
AND AUGER
ASSEMBLY
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
FME
Components
Shown, NME
similar.
THREAD INTO THE
AUGER HERE
January 2007
Page 27
Page 28
NME454, 654 & FME504, 804
REMOVAL AND REPLACEMENT: 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.
REMOVAL OF THE WATER SEAL
To Replace the Water Seal:
1. Lubricate the water seal with water, and push
the water seal into the bottom of the evaporator
slightly past the grove for the snap ring.
2. Replace the snap ring and pull the water seal
down against it.
3. The part of the water seal that rotates with the
auger must also be replaced. Remove the old part
from the auger and clean the mounting area.
4. Place a small bead of food grade silastic sealant
(such as 732 RTV or Scotsman part number
19-0529-01) on the area of the auger where the
water seal is to be mounted.
WATER SEAL
RETAINING
RING
PLACE FOOD GRADE
SEALANT HERE
5. Carefully push the water seal (rubber side
against the auger shoulder and the silastic.)
Do not get any sealant 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 2007
Page 28
Page 29
NME454, 654 & FME504, 804
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.
Heat sink the TXV body when unsweating or
resweating the adjacent tubing.
b) At the suction line at the joint about 3" from the
evaporator.
3. Remove the evaporator.
4. Unsweat the drier from the liquid line.
5. After installing a new water seal in the new
evaporator (see “To Replace the Water Seal”)
sweat in the new evaporator at the old tubing
connections.
6. Install an new drier in the liquid
line.
7. Evacuate the system until
dehydrated, then weigh in the
nameplate charge. Check for leaks.
8. Install auger, breaker, breaker
bearing assembly, and ice discharge
chute in reverse order of
disassembly. See “To Reassemble
Evaporator and Auger”
ICE CHUTE
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.
ICE SWEEP
EVAPORATOR
BREAKER
BEARING
January 2007
Page 29
AUGER
NME Components
Shown, FME similar.
Page 30
NME454, 654 & FME504, 804
REMOVAL AND REPLACEMENT: Gear Reducer and Motor
gears and bearings. They are likely to be fine if the
oil is.
If there is evidence of water in the oil (rusty
Electrical Shock Hazard.
Electrical shock 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, replace the switch or motor.
If the ohmmeter shows an open
circuit, replace the switch or
motor.
To Remove and Repair the Gear
and Motor Assembly:
(Assuming that the procedures through
removal of the water seal have been
performed.)
1. Remove the electrical wires from the
gear drive motor.
2. Unscrew the 4 cap screws holding the
gearmotor to the base of the machine.
3. Remove the gearmotor from the unit.
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 gear case cover, output
gear, bearings and output shaft are a
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
COVER &
OUTPUT GEAR
ASSEMBLY
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, the cover will have to
be moved closer to the
WATER SHED
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.
Bench test the gearmotor, check
for oil leaks, noise, and amp draw.
GEAR CASE
CENTRIFUGAL
SWITCH
ROTOR
BEARING
January 2007
Page 30
Page 31
NME454, 654 & FME504, 804
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
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
January 2007
Page 31
Page 32
NME454, 654 & FME504, 804
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 2007
Page 32
Loading...