Scotsman NSE650 Owner’s Manual
INTRODUCTION
NSE650
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 NSE650 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.
Table of Contents
FOR THE INSTALLER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
FOR THE PLUMBER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
FOR THE ELECTRICIAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
FOR THE INSTALLER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
START UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
COMPONENT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
ELECTRICAL SEQUENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
OPERATION: Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
OPERATION: Refrigeration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
TECHNICAL CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
MAINTENANCE AND CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
SERVICE DIAGNOSIS: Condition - No Ice Being Produced . . . . . . . . . . . . . . . . . . . . . . . . 18
REMOVAL AND REPLACEMENT: Water Reservoir & Bin Controls . . . . . . . . . . . . . . . . . . . . 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
REFRIGERATION SERVICE: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
CIRCUIT BOARD TESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Parts lists and wiring diagrams are in the center of this manual, printed on yellow paper.
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.
August 1993
Page 1
Refrigerant
Charge
(R-404a)
Minimum
Circuit
Ampacity
20
20
NSE650
FOR THE INSTALLER
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 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.
F 1000F
0
F 1000F
The normal finish for the ice machine is
enamel-sandalwood. A stainless steel panel kit,
SPKNS650 may be field installed to convert the
unit to a stainless steel finish.
SPECIFICATIONS: ICE MAKER
Model Number
NSE650AE-1A
NSE650WE-1A
Note: Minimum Circuit Ampacity is used to determine wire size and type per national electric code.
Dimensions
(w/o legs)
H x W x D
37.5" x 38.06" x 29.5"
same
Basic
Electrical
115/60/1
same
Ice Type
NUGGET
same
June 1994
Page 2
Condenser
Type
Air
Water
Max.
Fuse
Size
35
30
25 ounces
20 ounces
FOR THE INSTALLER: Environmental Limitations
NSE650
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.
When ready, do not
push the machine into
position, pushing may
damage the floor,
and/or the legs mounts.
Use a mechanical lift,
and set the unit in its selected location.
Level the unit, using the adjustable leg levelers:
both in the front to back and left to right directions.
Unscrew its two screws and take off the front
panel. Remove any packing material (styrofoam
blocks or cardboard sheets) that may be there.
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
FIELD
SUPPLIED
FILTER
VENTED
DRAIN
NSE650
FOR THE PLUMBER
CONFORM TO ALL APPLICABLE CODES
Water Inlet
Air Cooled Models: The recommended
water supply is clean, 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 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: 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 80 psig.
Drains
Air Cooled Models: There are two 3/4"
FPT drains at the back of the cabinet.
Drain lines are 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 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.
HAND
VALVE
WATER
INLET
WATER
COOLED
MODEL
VENTED
DRAIN
CONDENSER
DRAIN
CONDENSER
INLET
FLOOR DRAIN
June 1994
Page 4
FOR THE ELECTRICIAN
POWER
SUPPLY
CONFORM TO ALL APPLICABLE CODES
NSE650
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.
JUNCTION
BOX
August 1993
Page 5
NSE650
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?
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)
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?
June 1994
Page 6
START UP
NSE650
Pre-Start Inspection
1. Remove the front panels.
2. Check that the styrofoam shipping blocks 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 6).
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.
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.
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.
August 1993
Page 7
CONTROL BOX
ICE ACCESS
DOOR
NSE650
COMPONENT DESCRIPTION
Control Box: Contains the electrical controls that
operate the machine.
High Pressure Cut Out Switch: A manual reset
switch sensing the high side refrigeration pressure.
It is set to shut the machine off, and illuminate the
reset switch light 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 CHUTE
RESERVOIR
AND WATER
LEVEL SENSOR
EXPANSION
VALVE
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.
WATER COOLED
ICE LEVEL
SENSORS
GEARMOTOR
WATER
REGULATING
VALVE
HIGH
PRESSURE
CUT OUT
COMPRESSOR
ICE
STORAGE
BIN
CONDENSER
June 1994
Page 8
COMPONENT DESCRIPTION: Control Box
TRANSFORMER
NSE650
Contactor: A definite purpose contactor
connecting the compressor and the remote
condenser fan motor 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.
START
CAPACITOR
POTENTIAL
RELAY
Transformer: Supplies low voltage to the circuit
board.
Low Pressure Cut Out Switch: A manual reset
control that shuts 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.
"No Water" Light, glows
when water level in
reservoir is too low.
ON/OFF SWITCH
LOW PRESSURE
CUT OUT SWITCH
CIRCUIT
BOARD
"Bin Empty"
Light, glows
when ice level in
storage bin is
not full.
CONTACTOR
August 1993
Page 9
NSE650
COMPONENT DESCRIPTION
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
June 1994
Page 10
MOTOR
Loading...