Scotsman NDE750 Owner’s Manual
INTRODUCTION
NDE750
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 maker-dispenser.
The NDE750 is a combination nugget ice maker
and countertop dispenser. A water station is
standard.
The NDE750 ice making section is equipped with
the following features: electronic controls for bin
level and low water; thermostatic expansion valve;
front service for most components; and R-404a
(HP62) refrigerant. The ice dispensing section is a
seamless plastic storage bin, with a stainless steel
ice agitator at the bottom to sweep the ice into the
dispensing chute.
Table of Contents
FOR THE INSTALLER: Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 2
FOR THE INSTALLER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
FOR THE PLUMBER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
FOR THE ELECTRICIAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
FOR THE INSTALLER: Final Check List . . . . . . . . . . . . . . . . . . . . . . . . 6
INITIAL START UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
COMPONENT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
COMPONENT DESCRIPTION: Control Box . . . . . . . . . . . . . . . . . . . . . . . 9
ELECTRICAL SEQUENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
OPERATION: Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
OPERATION: Refrigeration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
OPERATION: Ice Vending . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
CLEANING and SANITIZING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
MAINTENANCE AND CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
MAINTENANCE AND CLEANING: Auger . . . . . . . . . . . . . . . . . . . . . . . . 17
SERVICE DIAGNOSIS: Condition - No Ice Being Produced . . . . . . . . . . . . . . 18
SERVICE DIAGNOSIS: Condition - Low Ice Production . . . . . . . . . . . . . . . . 21
SERVICE DIAGNOSIS: Condition - Poor or No Ice Dispensing . . . . . . . . . . . . . 22
REMOVAL AND REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
REMOVAL AND REPLACEMENT: Bearing And Breaker . . . . . . . . . . . . . . . . 24
REMOVAL AND REPLACEMENT: Water Seal . . . . . . . . . . . . . . . . . . . . . 26
TO REMOVE AND REPAIR THE GEARMOTOR ASSEMBLY . . . . . . . . . . . . . 28
REFRIGERATION SERVICE: HP62 . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
REFRIGERATION SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
This manual was printed on recycled paper.
Keep it for future reference.
December 1993
Page 1
Note this symbol when it appears.
It marks a possible hazard.
NDE750
FOR THE INSTALLER: Specifications
This ice maker-dispenser is designed to be
mounted on a machine stand, or a countertop.
Before beginning the installation, check that all the
materials and kits required are available at the
installation location.
Scotsman Ice Systems are designed and
manufactured with the highest regard for safety
and performance. They m eet or exce ed t he
standards of U.L., N.S.F., and C.S.A.
3/8" FPT
Cond.
Water Inlet
(W/C)
1/2" FPT
Cond. Drain
(W/C)
3/4 FPT
Drain
Scotsman assumes no liability or responsibility of
any kind for pr od ucts man uf acture d by S cot s m a n
that have been altered in any way, including the
use of any pa r ts an d/or ot he r co m ponent s not
speci fi cally approved by Scotsman.
Scots m an re ser ves the rig ht to mak e de s ign
chang es and/or im provements at any time .
Specif ications and designs are subject to change
without notice.
BACK VIEW
Water Limitations:
An ice machine is a food
manufacturing plant; it tak es
in a raw material, water, and
turns it into a food product,
ice. Th e purity of the water is
very important in obtaining
pure ice and in maximizi ng
product life.
General recommendations
are:
Electrical Junction
Box
3/8" Flare
Water In let
1. Filter the water used to
produc e ice.
2. Check with a water
treatment specialist for a
water test, and any
recommendations regardin g
6.63"
12.5"
4.63"
filters and trea tment.
.75"
3/4" FPT
Drain
3.84"
2.63"
5.59"
17.59"
7.93"
SPECIFICATIONS
Model
Number
NDE750AE-1
NDE750WE-1
Dimensions
(w/o stand)
H" x W" X D"
45.74" x 35.18" x 29.26"
same
Ice
Type
Nugget
same
Condenser
Type
Air
Water
Refrigerant
Charge
(R-404a)
32 ounces
22 ounces
Basic
Electrical
115/60/1
same
Minimum
Circuit
Ampacity+
18.1
16.5
+ Minimum C i r cui t Am pacit y is us ed to de termi ne wir e si z e and ty p e pe r National El e ctric Code .
Optional kit: KPC750 adds disp ense portion control to units mfg. after 6/97.
May 1997
Page 2
Maximum
Fuse
Size
25
20
FOR THE INSTALLER
NDE750
Location
This ice system is designed to be installed indoors,
in a controlled environment.
Minimum Maximum
0
Air Temp 50
Water Temp 40
Water Pressure 20 psi 80 psi
Voltage 104 126
Operating the machine outside of the above
limitations, or outdoors, is potentially damaging to
the machine; also it is misuse of the machine
which may void the warranty.
Service Limitations
Do not install in a location where the top of the
machine is within 6" of a fixed ceiling. Air cooled
models require a minimum of 6 inches to the left
and right of the machine for air circulation. It is
important that the machine be installed in a
location where it has enough space above and
behind it for service.
After uncrating and inspection, the unit is ready for
installation.
Machine Stand Installation
Tip the stand on its back and install the legs, return
the stand to the upright position. Adjust leg
levelers so that the stand does not “rock”.
Counter Top or Machine Stand Installation
The base of the icemaker-dispenser must be
sealed to the object it rests upon. Food grade
silastic sealant such as Scotsman part number
19-0529-01 is recommended.
Place a bead of the sealant on the machine stand
or counter top to match the outside edge of the
cabinet base and sink.
The icemaker-dispenser is heavy: use of a
mechanical hoist is recommended to lift it to the
height required to install it.
The DMS machine stand has holes in the top that
match up with threaded holes in the base of the
machine. Secure the machine stand to the base
with 4 5/16" bolts.
F. 1000F.
0
F. 1000F.
In both counter top and machine stand
installations, wipe off and neatly smooth any
excess sealant. Level the machine stand and
cabinet.
Unpack and install the sink brackets. Fit the sink
assembly onto the two sink brackets, and press
onto the bead of sealant. Wipe off and neatly
smooth any excess sealant from under the sink
edge. Connect the sink drain to the dispenser
drain system.
Airflow
SEAL
ICEMAKER-
DISPENSER TO
THE COUNTER
TOP OR
MACHINE STAND
December 1993
Page 3
NDE750
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 120 psig.
INLET WATER
Drains
Air Cooled Models: There is one 3/4" FPT drain
WATER COOLED
CONDENSER
WATER INLET
CONDENSER
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. Use only 3/4" rigid
tubing.
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.
VENTED
DRAIN
OPTIONAL
WATER
FILTER
SHUT OFF VALVE
FLOOR DRAIN
December 1993
Page 4
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.
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.
NDE750
POWER SUPPLY
ELECTRICAL
CONNECTION
December 1993
Page 5
NDE750
FOR THE INSTALLER: Final Check List
1. Is the icemaker-dispenser installed
indoors, in a location where the air and
water temperatures are controlled, and
where they do not go beyond design
limitations?
2. is there an electrical service
disconnect within sight of the installed
machine? Is the machine on a separate
circuit? Has the voltage been checked
and compared to nameplate
requirements?
3. Have all of the plumbing connections
been made and checked for leaks?
4. Has the machine been leveled?
5. Is there a minimum of 6 inches of
clearance at the left and right sides of an
air cooled machine?
ELECTRICAL?
LEVELED?
6. Is there a minimum of 6 inches of
clearance at the top and back of the
machine for service and utility
connections?
7. Is there a water shut off valve
installed near the machine?
8. Have all of the shipping blocks been
removed?
WATER INLET?
DRAINS?
December 1993
Page 6
INITIAL START UP
Pre Start Inspection
1. Remove the two front panels.
2. Check that all shipping blocks have been
removed.
3. Remove any and all packing tape (check inside
the storage bin).
4. 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 on air
cooled models turns freely.
5. Check that the machine is installed correctly
according to the final check list.
Start Up
1. Go through the pre start inspection.
2. Open the water 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.
NDE750
7. Check ice dispensing by pushing in on the glass
filler lever. Ice dispenses are portion controlled; by
turning a knob, the length of time the unit
dispenses when the glass filler lever is pushed
(and the amount of ice dispensed) is adjusted.
3. Switch the master switch on. The electrical start
up sequence is now on automatic:
A. There will be a short (15 second) delay before
the gearmotor starts.
B. After the gearmotor starts, the compressor will
start.
4. On air cooled models, warm air will begin to flow
from the condenser. Water cooled models will
begin to discharge warm water down the drain.
5. The unit should soon be making ice. If desired,
the low side pressure may be checked: it should
be 38 PSIG + or - 4 PSIG.
The air cooled discharge pressure will depend
upon air and water temperatures, but should be
between 200 PSIG and 300 PSIG.
Water cooled discharge pressure should be about
245 PSIG. If needed, adjust the water regulating
valve.
The above numbers are for new, clean machines.
Field values may be somewhat higher or lower.
6. There are no adjustments to make, so replace
the panels.
8. Switch off the icemaker-dispenser, remove the
top panel and the top of the ice storage bin.
Sanitize the interior of the ice storage bin by wiping
it with a mixture of 1 ounce of household bleach to
2 gallons of water, allow to air dry. Replace all
covers and panels. Switch the icemaker-dispenser
back on.
9. Give the owner/user the service manual, instruct
him/her in the operation and maintenance
requirements of the unit. Make sure they know
who to call for service.
10. Fill out the Customer Evaluation and warranty
Registration form, and mail it in to Scotsman.
December 1993
Page 7
NDE750
COMPONENT DESCRIPTION
ICE LEVEL SENSOR
EVAPORATO R
DRAIN
DRAIN
TUBE
TUBE
RESERVOIR
WATER
LEVEL
SENSOR
ICE STORAGE BIN
CONTROL BOX
GLASS FILLER
CONDENSER
HI
PRESSURE
CUT OUT
PORTION
CONTROL KNOB
PRESSURE
CUT OUT
Control Box:
LOW
Contains the electrical controls that
operate the mach ine.
High Pressure Cut Out Switch
: A manual reset
switc h sensing the high s ide refrigerati on pr es s ur e.
It is set to shut the machine off if the discharge
pressu re s ho uld ever exceed 450 ps i g .
Evapo ra tor:
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 i n th e ev a po r at or at a c o nstant l ev el , it al s o
contains the water level sensor.
Water Level Sensor:
Senses if there is water in
the reservoir to make ice out of. Will shut the
machin e off it th ere i s no ne .
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.
Ice Leve l Se n so r :
An electronic “eye”, it senses
the pres en ce of ice in th e bottom of the ic e
discharge chute. Operates to turn the ice machine
on and off automatically as the level of ice in the
bin chan ges.
Drain Tube
: When un capped an d l owered, drai ns
the evap or ator.
Condenser:
Air or water c oo l ed , w he r e th e he at
remov ed in ic e m ak ing is dis charged.
Ice Storage Bin Assembly:
A plast i c lined,
insulated cylinder that receives, stores and
dispenses the ice. Fresh ice enters at the top, and
when the bin is full enough the ice will be between
the ice level sensors, and the icemaking will stop.
Ice is dispensed through a chute at the bottom
front when the agi tator assem bly sweeps the ice
through the chute.
Glass Filler L e ve r:
Pushing in on this lever
causes the ice dispensing cycle to occur.
Portion Control Knob:
Turning this knob adjusts
the length of tim e of dispense. No t standa rd af t er
6/97.
May 1997
Page 8
COMPONENT DESCRIPTION: Control Box
NDE750
Contactor:
connecting the comp res sor to the po w er s up ply .
Circuit Board:
through sensors and relays. The sensors are for
ice level and water level. The relays are for the
gear mot or (w ith a buil t i n ti m e delay to cle ar the
evaporator of ice when the unit turns off) and for
the compressor.
On/Off Switch :
Transformer:
board.
Potent ia l Rel ay
Portion Control Module:
time th e dispensi ng drive motor is
on. The time is varied by adjusting
the portion control knob.
Note: Portion control not standard
on units mfg. after 6/97. May be
added on with kit KPC 7 50.
A definite purpose con ta c t or
Controlling the ice machine
Manual co ntrol for th e m ac h i ne .
Supplies low voltage to the circuit
: The compressor start relay.
Controls the amoun t of
PORTION CONTROL
POTENTIA L R ELAY
TRANSFORMER
CIRCUIT BOARD
CONTACTOR
May 1997
Page 9
NDE750
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.
ICE CHUTE
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
AUGER
WATER SEAL
WATER INLET
GEAR MOTOR
EVAPORATOR
December 1993
Page 10
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