Scotsman NME1250 Installation Manual
INTRODUCTION
NME1250
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.
The NME1250 features: 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 HP62 as the refrigerant.
TABLE OF CONTENTS
FOR THE INSTALLER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
FOR THE INSTALLER: Environmental Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
FOR THE PLUMBER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
FOR THE ELECTRICIAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
FOR THE INSTALLER: Final Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
START UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
COMPONENT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
ELECTRICAL SEQUENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
MAINTENANCE: Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
SERVICE DIAGNOSIS: Condition - No Ice Being Produced . . . . . . . . . . . . . . . . . . . . . . . . 18
SERVICE DIAGNOSIS: Condition - Low Ice Production . . . . . . . . . . . . . . . . . . . . . . . . . . 21
REMOVAL AND REPLACEMENT: Water Reservoir & Bin Control . . . . . . . . . . . . . . . . . . . . 22
REMOVAL AND REPLACEMENT: Bearing And Breaker . . . . . . . . . . . . . . . . . . . . . . . . . 23
REMOVAL AND REPLACEMENT: Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
REMOVAL AND REPLACEMENT: Water Seal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
REMOVAL AND REPLACEMENT: Evaporator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
REMOVAL AND REPLACEMENT: Gearmotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
REFRIGERATION SERVICE: HP62 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
CIRCUIT BOARD TESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Parts Lists and Wiring Diagrams are located in the center of this manual, printed on yellow paper.
This manual was printed on recycled paper.
Keep it for future reference.
Note this symbol when it appears.
It marks a potential hazard.
August 1993
Page 1
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FOR THE INSTALLER: Environmental Limitations
NME1250
Installation Limitations:
This ice system is designed to be installed indoors,
in a controlled environment:
Min. Max.
0
Air Temperature 50
Water Temperature 40
Water Pressure 20 psi 80 psi
Voltage -5% +10%
(Compared to the nameplate)
Operating the machine outside of the limitations is
misuse and can void the warranty.
F 1000F
0
F 1000F
Water Limitations
An ice machine is a food manufacturing plant; it
takes a raw material, water, and turns it into a food
product, ice. The purity of the water is very
important in obtaining pure ice and in maximizing
product life. This section is not intended as a
complete resource for water questions, but it does
offer these general recommendations:
1. Filter the water used to produce ice. That is 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 CSA.
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.
August 1993
Page 3
LEVEL THE
ASSEMBLY
NME1250
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.
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.
GASKET
Ice Maker
The machine is heavy, so the use of a
mechanical lift is recommended for
lifting the machine high enough to install
on top of the bin. After the unit is placed
on the bin, line it up so it is even with
the back, left, and right sides. Secure
the machine to the bin with the
hardware provided with the machine.
FASTEN THE MACHINE
TO THE BIN WITH THE
HARDWARE SUPPLIED
WITH THE ICE MAKER
June 1994
Page 4
FOR THE PLUMBER
Use only 3/4" rigid tubing.
CONFORM TO ALL APPLICABLE CODES
NME1250
Water Inlet
Air Cooled Models: The recommended water
supply is cold water. Use 3/8" O.D. copper tubing,
connect to the 3/8" male flare at the back of the
cabinet. Install a hand valve near the machine to
control the water supply.
WATER
COOLED
WATER INLET
HAND SHUT
OFF VALVE
CONNECT TO
COLD WATER
3/8" FLARE
Drains
Air Cooled Models: There is one 3/4" FPT drain at
the back of the cabinet, the drain line is of the
gravity type, and 1/4 inch per foot fall is an
acceptable pitch for the drain tubing. There should
be a vent at the highest point of the drain line, and
the ideal drain receptacle would be a trapped and
vented floor drain.
FILTER, FIELD
INSTALLED
(OPTIONAL)
Water Cooled Models: A separate 3/8" O.D.
copper line is recommended, with a separate hand
valve to control it. It is connected to a 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 120 psig.
ICE MAKER
DRAIN
3/4" FPT
BIN DRAIN
3/4" FPT
Water Cooled Models: In addition to the above
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.
August 1993
Page 5
ICE MAKER
JUNCTION BOX
NME1250
FOR THE ELECTRICIAN
CONFORM TO ALL APPLICABLE CODES
The electrical power to the unit is supplied through
the junction box at the rear of the machine.
Check the nameplate (located on the back panel)
for the voltage requirements, and for the minimum
circuit ampacity. The machine requires a solid
chassis to earth ground wire.
The ice maker should be connected to its own
electrical circuit so it would be individually fused.
Voltage variation must remain within design
limitations, even under starting conditions.
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.
THIS UNIT MUST BE
GROUNDED
June 1994
Page 6
FOR THE INSTALLER: Final Check List
1. Is the ice system installed indoors in a
location where the air and water
temperatures are controlled, and where
they do not exceed the design limitations?
NME1250
2. Is there an electrical service disconnect
within sight of the installed machine? Has
the voltage been checked, and compared
to nameplate requirements?
3. Have all the plumbing connections been
made and checked for leaks?
4. Has the machine and bin been leveled?
5. Is there a minimum of 6" clearance at the
rear, left, and right of the machine for
proper service access and air circulation?
6. Is the water pressure a minimum of 20
psig?
7. Has the machine been secured to the
bin?
8. Is there a water shut off valve installed
near the machine?
LEVELED?
POWER
SUPPLY?
PLUMBING?
MACHINE
SECURE TO
BIN?
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?
DRAINS?
August 1993
Page 7
NME1250
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.
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.
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).
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.
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
70
F. and higher than 32 when ambient is over
o
90
F.
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 1994
Page 8
COMPONENT DESCRIPTION
CLEANING DRAIN
TUBE
NME1250
Control Box: Contains the electrical controls that
operate the machine.
Low Pressure Cut Out: "A" models only: A
manual reset switch set to shut the machine off
should the low side pressure go below 0-4 psig.
High Pressure Cut Out: A manual 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.
CONTROL BOX
Ice Discharge Chute: Directs the ice made by the
evaporator into the storage bin.
Ice Level Sensor: An electronic "eye", it senses
the presence of ice in the bottom of the ice
discharge chute. Operates to turn the ice machine
on and off automatically as the level of ice in the
bin changes.
Gear Motor: An oil filled, speed reduction
gearbox, driving the auger.
Cleaning Drain Tube: When uncapped and
lowered, drains the evaporator.
Compressor: The refrigerant vapor pump.
Condenser: Air or water cooled, where the heat
removed in ice making is discharged.
Expansion valve: The refrigerant metering
device.
LOW PRESSURE
CUT OUT
RESERVOIR
WATER LEVEL SENSOR
(INSIDE RESERVOIR)
STRAINER
COMPRESSOR
HIGH PRESSURE
CUT OUT
CONDENSER
ICE CHUTE
EXPANSION
VALVE
EVAPORATOR
GEARMOTOR
ICE LEVEL
SENSOR
August 1993
Page 9
CONTACTOR
NME1250
COMPONENT DESCRIPTION: 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: 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.
Transformer: Supplies low voltage to the circuit
board.
Low Pressure Control (Cut Out): A manual reset
control to shut off the ice machine when the low
side pressure drops below a preset point, 0-4 psig.
Potential Relay: The compressor start relay.
On/Off Switch: Manual control for the machine.
LOW PRESSURE
CUT OUT
ON/OFF SWITCH
TRANSFORMER
CIRCUIT BOARD
POTENTIAL RELAY
June 1994
Page 10
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