Scotsman NSE654 Installation Manual
INTRODUCTION
NSE654
To the owner or user: The service manual you are
reading is intended to provide you, and the
maintenance or service technician, with the
information needed to install, start up, clean,
maintain, and service this ice system.
Table of Contents
FOR THE INSTALLER ······································ Page 2
FOR THE INSTALLER: Environmental Limitations ························ Page 3
FOR THE PLUMBER ······································· Page 4
FOR THE ELECTRICIAN ····································· Page 5
FOR THE INSTALLER ······································ Page 6
START UP ············································ Page 7
COMPONENT DESCRIPTION ·································· Page 8
COMPONENT DESCRIPTION ·································· Page 9
COMPONENT DESCRIPTION: Control Box ··························· Page 10
ELECTRICAL SEQUENCE ···································· Page 11
OPERATION: Water ······································· Page 12
OPERATION: Refrigeration ···································· Page 13
TECHNICAL CHARACTERISTICS ································ Page 14
MAINTENANCE AND CLEANING ································ Page 15
SENSOR MAINTENANCE ···································· Page 16
BEARING MAINTENANCE ···································· Page 17
MAINTENANCE AND CLEANING: Auger ···························· Page 18
SERVICE DIAGNOSIS ······································ Page 19
SERVICE DIAGNOSIS: ····································· Page 20
CONTROL SYSTEM DIAGNOSTICS ······························ Page 21
REMOVAL AND REPLACEMENT: Water Reservoir & Bin Controls ··············· 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: Evaporator ·························· Page 27
REMOVAL AND REPLACEMENT: Gearmotor ·························· Page 28
REFRIGERATION SYSTEM SERVICE ····························· Page 29
The NSE654 is a complete ice system that
produces and stores nugget ice.
It features: front service for the condenser, control
box, and water reservoir; an electronic circuit for
monitoring ice and water level; a thermostatic
expansion valve; and HP62 as the refrigerant.
This manual was printed on recycled paper.
Keep it for future reference.
Note these symbols when they appear.
They mark a section that concerns potential hazards.
January 2000
Page 1
NSE654
FOR THE INSTALLER
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 104 126
(Compared to the nameplate)
Operating the machine outside of the limitations is
misuse and can void the warranty.
When installing a new system, check to be sure
that you have everything you need before
beginning:
Correct Ice Machine (air or water cooled)
All kits, legs, and information required for
the specific job.
0
F 1000F
0
F 1000F
SPECIFICATIONS: ICE MAKER
Model
Number
NSE654AS-1 A or B 37.5" x 38.06" x 29.5" 115/60/1 NUGGET Air 20 35 25 ounces
NSE654WS-1 A same same NUGGET Water 20 30 20 ounces
NSE654WS-1 B same same same same same same 19 ounces
Model
Series
Dimensions
(w/o legs)
HxWxD
Basic
Electrical
Ice Type Condenser
Type
Minimum
Circuit
Ampacity
Maximum
Fuse Size
Refrigerant
Charge
(R-404A)
Note: Minimum Circuit Ampacity is used to determine wire size and type per national electric code.
June 2002
Page 2
FOR THE INSTALLER: Environmental Limitations
NSE654
Location
After uncrating the machine, and inspecting it for
freight damage, the unit is ready for installation.
It is important that the machine be installed in a
location where it has enough space for service
access. The unit will require removal of the top
panel for some service, so in under counter
applications, the unit will either have to be pulled
out, or the countertop will have to be removable.
Utility installation needs some space at the back of
the cabinet, the minimum is 6 inches.
On air cooled models, the air flow must be given
consideration: the unit takes in air from the front,
and exhausts it through the left and back panels.
These areas require at least 6 inches of air space
to exhaust the hot air.
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 greatly 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.
Legs
The legs (when used) may now
be installed. Either use a
mechanical lift to hoist the cabinet
high enough to screw in the legs,
or carefully lay the unit on its back
(using portions of the carton to
protect the back panel) and screw
the legs in. Note: the legs must be
threaded in all the way for
maximum strength.
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
NSE654
FOR THE PLUMBER
CONFORM TO ALL APPLICABLE CODES
Water Inlet
Air Cooled Models: Connect a cold
potable water supply to the 3/8" male flare
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 3/8" O.D. copper line, with a
separate hand valve to control it, 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
HAND
VALVE
FIELD
SUPPLIED
FILTER
WATER
INLET
WATER
COOLED
MODEL
VENTED
DRAIN
VENTED
DRAIN
Air Cooled Models: There are two 3/4"
FPT drains at the back of the cabinet.
Connect a drain tube to each. These are
gravity type drains, and 1/4 inch per foot
fall is an acceptable pitch for the drain
tubing. Install a vent at the highest point
of each drain line, and the ideal drain
receptacle would be a trapped and vented
floor drain. Use only 3/4" rigid tubing.
Water Cooled Models: In addition to the
above mentioned drains, a separate
condenser drain must be installed.
Connect it to the 1/2" condenser drain
connection at the back of the cabinet.
CONDENSER
DRAIN
CONDENSER
INLET
January 2000
Page 4
FLOOR DRAIN
FOR THE ELECTRICIAN
CONFORM TO ALL APPLICABLE CODES
NSE654
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.
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
JUNCTION
BOX
January 2000
Page 5
NSE654
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 been leveled?
5. Is there a minimum of 6" clearance at the back
and left side of the machine for proper service
access and air circulation? (air cooled)
LEVELED?
6. Is the water pressure a minimum of 20 psig?
7. Is the unit grounded?
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?
POWER
SUPPLY?
WATER
SUPPLY?
DRAINS?
January 2000
Page 6
START UP
Pre-Start Inspection
1. Remove the front panels.
2. Check that the styrofoam shipping blocks 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 6).
Start Up
NSE654
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 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
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.
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.
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 manufacturers registration card, and
mail it to the Scotsman Factory.
10. Fill out the Customer Evaluation & Warranty
Registration Form, and mail it to Scotsman.
January 2000
Page 7
NSE654
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.
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 none.
Ice Discharge Chute: Directs the ice produced by
the evaporator into the storage bin.
RESERVOIR
AND WATER
LEVEL SENSOR
ICE CHUTE
EXPANSION
VALVE
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.
ICE LEVEL
SENSORS
WATER COOLED
ICE ACCESS
DOOR
GEARMOTOR
WATER
REGULATING
VALVE
HIGH
PRESSURE
CUT OUT
COMPRESSOR
ICE
STORAGE
BIN
CONTROL BOX
January 2000
Page 8
CONDENSER
COMPONENT DESCRIPTION
NSE654
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: A split phase motor that drives the gear
reducer.
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
WATER
SEAL
AUGER
EVAPORATOR
January 2000
Page 9
MOTOR
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