Scotsman NM1852R Installation Manual
INTRODUCTION
NM1852R
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 NM1852R is a remote condenser modular ice
system. 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
For the Installer
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Remote Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
For the Plumber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
For the Electrician . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Final Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Component Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Maintenance & Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Service Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Removal and Replacement
Water Reservoir & Bin Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Thrust Bearing & Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Water Seal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Evaporator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Gearmotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Refrigeration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Circuit Board Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Parts Lists and Wiring Diagrams are located in the center of this manual, printed on yellow
paper.
December 1992
Page 1
Drain 3/4" FPT
18.28"
NM1852R
FOR THE INSTALLER
The NM1852R is designed to fit the
following Scotsman storage bins:
••B90 and extentions, with bin top
KBT18.
••BH800 no bin top needed.
••BH900 using bin top KBT14.
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
••All kits, legs, and information
required for the specific job.
There are two separate ice making
and refrigeration systems in this
model. The liquid and discharge
lines from each system must go to
separate circuits in one remote
condenser (RC1222).
TOP VIEW
Ice Chute
6.7" x 6.2"
BACK VIEW
Allow 6" of space behind the machine
for utility connections.
34.84"
Liquid Line
Connection
(right system)
15.53"
3.1"
21"
3.1"
13.84"
Discharge Line
Connection
(left system)
Allow 6"
above
machine for
service.
20.84"
5.25"
3"
Remote Condenser
17.8"
18.8"
21.66"
Electrical Inlet
Water Inlet 3/8" Flare
SPECIFICATIONS: ICEMAKER
Model
Number
NM1852RE-32A
NM1852RE-3A
Dimensions
(w/o bin)
H X W X D
27" x 42" x 24"
same
Basic
Electrical
208-230/60/1
208-230/60/3
Ice
Type
NUGGET
same
Cond.
Type
R/Air
R/Air
The Standard Finish is Enamel - Sandalwood. There is an optional stainless steel panel kit, SPKFM42
available to convert the unit to Stainless Steel. It is field installed.
December 1992
Page 2
4.5"
9.43"
Junction Box
FOR THE INSTALLER
Installation Limitations:
This ice system is designed to be installed indoors,
in a controlled environment:
Min Max
0
Air Temperature 50
(Not including the remote condenser)
Water Temperature 40
Water Pressure 20 PSIG 80 PSIG
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.
water test is important.
F 1000F
0
F 1000F
That is why a
NM1852R
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"
December 1992
Page 3
Typical Storage Bin - B90
21.12"
Drain
3/4"
FPT
19.86"
NM1852R
REMOTE CONDENSER SPECIFICATIONS
1/2" MALE QUICK CONNECT
COUPLING FOR USE WITH
RT2225 OR RT2240
PRECHARGED LINE SET
22"
5.75"
5.38"
32.56"
27.81"
5.0"
MODEL USE WITH MINIMUM CIRC.
RC1222 27.8" X 22 X 37.94" 1 NM1852R 2 208-230/60/1
+Included with the ice maker’s minimum circuit ampacity. Use this
value to determine wire size between icemaker and fan motor.
DIMENSIONS
H" X W" X D"
6.5"
3.5"
1.9"
LIQUID LINE 3/8" MALE
QUICK CONNECT
COUPLING FOR USE WITH
RT2225 OR RT2240
PRECHARGED LINE SET
RT-2225 Precharged line set, 25’, R-22 - 2 required.
Or: RT-2240. Precharged line set, 40’, R-22 - 2 required.
7.5"
AMPACITY+
BASIC
ELECTRICAL
ICEMAKER NAMEPLATE
LOCATED ON BACK PANEL
SERIAL PLATE LOCATED
BEHIND FRONT PANEL
December 1992
Page 4
FOR THE INSTALLER
Typical Storage Bin with Extension and Bin Top
NM1852R
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, usually a
minimum of 6 inches. 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.
Install the bin top according to the directions with
the bin top.
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.
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.
Note: Be sure to allow a 6" minimum space
above the top of the machine for service.
December 1992
Page 5
REMOTE CONDENSER
SPIRAL
EXCESS
TUBING
INSIDE
BUILDING
NM1852R
FOR THE INSTALLER: Remote Condenser
Location
Limited to a 40 foot or a 25 foot length of
precharged refrigerant tubing connecting the
icemaker to the remote condenser. The
condenser must be above or level with the
icemaker.
Select the best available location, protecting the
condenser from extremes of dirt, dust, and sun.
Meet all applicable building codes. Usually the
services of a licensed electrician are required.
Roof Attachment
1. Install and attach the remote condenser to the
roof of the building, using the methods and
practices of construction that conform to the local
building codes, including having a roofing
contractor secure the condenser to the roof.
2. Have an electrician connect the remote
condenser fan motor to the icemaker, using the
junction box at the back of the icemaker.
PRECHARGED LINE ROUTING
////////////////////////////CAUTION/////////////////////////////
Do not connect precharged tubing until all routing
and forming of the tubing is complete. See the
coupling instructions, next page for connecting
instructions.
/////////////////////////////////////////////////////////////////////////
1. Each set of precharged refrigerant lines (either
25 foot or 40 foot) consists of a 3/8 inch diameter
liquid line and a 1/2 inch diameter discharge line.
Both ends of each line have quick connect
couplings, one end has a schrader valve
connection, that end goes to the condenser.
Note: The openings in the building ceiling or wall,
listed in the next step, are the minimum sizes
recommended for passing the refrigerant lines
through.
2. Have the roofing contractor cut a minimum hole
for the refrigerant lines of 1 3/4 inch. Check local
codes, a separate hole may be required for the
electrical power to the condenser.
////////////////////////////CAUTION/////////////////////////////
DO NOT KINK OR CRIMP REFRIGERANT
TUBING WHEN INSTALLING IT.
/////////////////////////////////////////////////////////////////////////
3. Route the refrigerant lines through the roof
opening.
Follow straight line routing whenever possible.
Any excess tubing MUST be retained within the
building.
4. Spiral the excess length of pre charged tubing
inside the building. Use a horizontal spiral (as
illustrated) to avoid any traps in the lines.
5. Have the roofing contractor seal the holes in
the roof per local codes.
Note: Tight spiral shown not required. Bend tubing
as tight as is practical.
Refrigerant charge is in the ice machine receiver.
Only a holding charge is in the "pre-charged" lines.
LOCATE REMOTE
CONDENSER
ABOVE ICEMAKER
December 1992
Page 6
FOR THE INSTALLER: Precharged Lines
COUPLING INSTRUCTIONS
/////////////////////////////CAUTION/////////////////////////////
The couplings on the sets of precharged lines are
self sealing when installed properly. Carefully
follow the instructions:
//////////////////////////////////////////////////////////////////////////
1. Remove the protector caps and plugs. Wipe the
seats and threaded surfaces with a clean cloth to
be certain that no foreign matter remains on them.
2. Lubricate the inside of the couplings, especially
the O-Rings with refrigerant oil.
3. Begin tightening the couplings together by
hand,
••Connect the 3/8 inch liquid line (schrader valve
end) to the remote condenser fitting marked
"liquid line".
••Connect the other end of the liquid line to the
icemaker fitting marked "liquid line."
••Connect the 1/2 inch discharge line (schrader
valve end) to the remote condenser fitting
marked "discharge line".
••Connect the other end of the liquid line to the
icemaker fitting marked "discharge line".
4. Then using two wrenches (it is important that
ONLY the nut on the precharged lines be turned,
the other parts of the couplings must NOT be
allowed to turn or the process will tear out the
diaphragms and they will be loose in the
refrigeration system) tighten the coupling until it
bottoms out or a definite increase in resistance is
felt.
5. Using a marker or pen, mark a line lengthwise
from the coupling union nut to the bulkhead. Then
tighten the coupling and additional 1/4 turn. As the
nut turns, the line will show when 1/4 turn is made.
6. After all connections are made, and after the
king valve has been opened, check the couplings
for leaks.
NM1852R
SERVICE PORTS
REMOTE CONDENSER
3/8" LIQUID LINE
1/2" DISCHARGE
LINE
3/8" LIQUID LINE
SCHRADER
VALVE
CONDENSER
TO REMOTE
1/2" DISCHARGE
LINE
NO SCHRADER
VALVE
TO ICEMAKER
December 1992
Page 7
ICEMAKER
NM1852R
FOR THE INSTALLER: Location
CONTACT ROOFING
CONTRACTOR
EXCESS
PRECHARGED
TUBING INSIDE
BUILDING
REMOTE
CONDENSER
ROOF
CUTAWAY
SERVICE
ACCESS
SERVICE ACCESS
SIDE AND BACK
WALL
CUTAWAY
December 1992
Page 8
FOR THE PLUMBER
CONFORM TO ALL APPLICABLE CODES
NM1852R
Water Inlet
CONNECT TO
COLD WATER
FIELD
SUPPLIED
WATER FILTER
HAND SHUT
OFF VALVE
WATER INLET
3/8" MALE
FLARE
VENT
ICEMAKER
DRAIN,
3/4" FPT
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.
Drains
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. Use
only 3/4" rigid tubing.
Storage Bin: A separate gravity type
drain needs to be run. Insulation of
this drain line is recommended.
VENT BIN DRAIN
3/4" FPT
FLOOR DRAIN
December 1992
Page 9
NM1852R
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.
Electrically the remote condenser fan motor is
connected to the icemaker at the contactor
TERMINAL STRIP
FOR REMOTE
CONDENSER
ICEMAKER
JUNCTION BOX
POWER
SUPPLY
terminals for the compressor and the fan motor
operates whenever the compressor operates.
Electrical connections are made at the junction
box at the back of the icemaker and at the junction
box on the remote condenser.
The remote condenser must be wired to the
icemaker in accordance with local and national
electrical codes with a minimum of 18 Awg. wire
with an ground bonding wire connected to the
ground screws provided in both the condenser and
machine field wiring boxes. All outdoor wiring
must be in rain proof conduit.
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.
GROUND
THE
CHASSIS
RAIN PROOF
CONDUIT
December 1992
Page 10
FOR THE INSTALLER: Completed Installation
INSULATED
PRECHARGED
REFRIGERANT
TUBING
A typical installation should generally appear as
illustrated below. The remote condenser must be
located above the icemaker and the precharged
lines installed per the instructions on page 6.
NM1852R
December 1992
Page 11
NM1852R
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 rear, left, right
and above the machine for
proper service access?
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?
9. Is the remote condenser
installed per local building codes,
and in a place where it has
adequate ventilation and minimal
solar heat gain?
10. Has all shipping material and
literature (inside the front panel)
been removed from the units?
11 Have the remote condenser
and precharged lines been
properly installed?
12. Has the electrical connection
between the icemaker and the
condenser been made?
13. Verify that the master
switches are in the OFF position.
14. Switch on the electrical
power.
REMOTE
CONDENSER
SECURED?
LEVELED?
PLUMBING?
15. Refer to Pre-Start instructions, the next page.
ROOF
HOLES
SEALED?
POWER
SUPPLY?
December 1992
Page 12
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