Scotsman NM1852 Operator’s Manual
INTRODUCTION
NM1852
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 product contains 2 separate ice making
systems in one cabinet.
The NM1852 is a modular ice system that fits a
variety of Scotsman ice storage bins.
It features: front service for the freezer, gearmotor,
control box, water reservoir, and bin control; an
electronic circuit for monitoring ice and water level;
a thermostatic expansion valve; and R-22 as the
refrigerant.
TABLE OF CONTENTS
Installation
For the Installer
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Storage Bin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
For the Plumber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
For the Electrician . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Final Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Component Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Electrical Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Maintenance and Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Service Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Removal and Replacement
Reservoir and Bin Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Bearing and Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Water Seal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Evaporator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Gearmotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Fan Motor Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Refrigeration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Electronic Tester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Parts lists and wiring diagrams are in the center of this manual, printed on yellow paper.
August 1993
Page 1
Electrical Inlet
Water Inlet 3/8" Flare
Condenser Drain (W/C):
1/2" FPT
18.74"
34.84"
NM1852
FOR THE INSTALLER
The NM1852 is designed to fit
the following Scotsman storage
bins:
B90 and extensions
(with bin top KBT18)
BH800 no bin top required.
BH900 using bin top KBT14.
BH1360, no bin top required.
When installing a new system,
check to be sure that you have
everything you need before
beginning:
Correct Bin
Correct Ice Machine
Correct Bin Top (if required)
All kits, legs, and
information required for the
specific job.
BACK VIEW
Condenser Inlet (W/C):
3/8" FPT
5.25"
9.5"
3"
TOP VIEW
Ice Chute
2.64" x 6.2"
14.9"
15.8"
18.9"
Drain 3/4" FPT
6"
18.28"
The normal finish for the ice machine is
enamel-sandalwood. A stainless steel panel kit,
SPKFM42 may be field installed to convert the unit
to a stainless steel finish.
SPECIFICATIONS: ICE MAKER
Model
Number
NM1852AE-32A
NM1852WE-32A
NM1852AE-3A
NM1852WE-3A
Dimensions
(w/o bin)
H X W X D
27" x 42" x 24"
same
same
same
Basic
Electrical
208-230/60/1
same
208-230/60/3
same
Ice
Type
NUGGET
same
same
same
13.84"
Note: Allow 6" behind and 6"
above the unit for air
circulation, utility connections,
and service.
Condenser
Type
Refrigerant Charge*
Air Cooled 32 oz. R-22
Water
Air
Water
Air
Water
Cooled
* Per system. Always go by
the nameplate.
28 oz. R-22
August 1993
Page 2
FOR THE INSTALLER: Environmental Limitations
NM1852
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.
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 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 will
be effective in all situations.
test is important.
F 1000F
0
F 1000F
That is why a water
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.
1.25"
August 1993
Page 3
Typical Storage Bin - B90
21.12"
Drain
3/4"
FPT
NM1852
FOR THE INSTALLER
Typical Storage Bin with Extension and Bin Top
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 at the back 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.
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 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 side. Secure the machine to the bin with the
hardware provided with the machine.
Remove the front panel and remove any shipping
blocks.
August 1993
Page 4
FOR THE INSTALLER: Location
ALLOW ROOM
FOR AIR
CIRCULATION
AND SERVICE
ACCESS
NM1852
DO NOT STACK ANYTHING IN
FRONT OF THE MACHINE(S)
August 1993
Page 5
NM1852
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, and connect to the single 3/8" male flare at
the back of the cabinet. This connection supplies
water to both ice making systems. 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 single 3/8"
FPT condenser inlet at the back of the cabinet.
This connection supplies water to both water
cooled condensers. The water pressure to all lines
must always be above 20 psig, and below 80 psig.
Drains
Air Cooled Models: There is one 3/4" FPT drain
for both ice making systems 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. There is one drain for both ice
making systems. 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.
COMPLETE PLUMBING INSTALLATION, WATER
COOLED
AIR COOLED
MODELS
HAND
VALVE
WATER
COOLED
HAND
VALVE
FIELD
SUPPLIED
FILTER
CONDENSER
WATER
FILTER
INLET
CONDENSER
DRAIN
WATER
INLET
VENTED
DRAIN
VENTED
DRAIN
August 1993
Page 6
FOR THE ELECTRICIAN
CONFORM TO ALL APPLICABLE CODES
NM1852
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.
WATER COOLED
AIR COOLED
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
August 1993
Page 7
NM1852
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 above 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?
August 1993
Page 8
START UP
NM1852
Pre-Start Inspection
1. Remove the front and side service panels.
2. Check that the styrofoam shipping blocks have
been removed.
The following procedure applies to each of the two separate ice making systems.
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).
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.
The air cooled discharge pressure will depend
upon air and water temperatures, but should be
between 200 psig and 280 psig.
The water cooled discharge pressure should be
constant at about 220 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 of each system can be
checked: it should be 25 psig + or - 2 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.
August 1993
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 field quality audit form, and mail it to
the Scotsman factory.
Page 9
AIR COOLED
ICE LEVEL
SENSORS
NM1852
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 400 psig.
Evaporator: A vertical stainless steel tube,
refrigerated, and water filled. In it there is a
stainless steel auger.
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
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.
Drain Tube: When uncapped and lowered, drains
the evaporator.
Condenser: Air or water cooled, where the heat
removed in ice making is discharged.
Expansion valve: The refrigerant metering
device.
the reservoir to make ice out of. Will shut the
machine off it there is none.
There are two of each of the above components in the NM1852.
WATER
COOLED
EXPANSION
VALVES
CONDENSERS
RESERVOIRS
ICE CHUTES
CONTROL
BOXES
COMPRESSOR
HIGH
PRESSURE
CUT OUT
August 1993
Page 10
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