Scotsman NME1250R Installation Manual
INTRODUCTION
NME1250R
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 NME1250R is a remote condenser modular
ice system that 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 HP62 as the refrigerant.
Table of Contents
FOR THE INSTALLER: Remote Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
FOR THE PLUMBER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
FOR THE ELECTRICIAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
FOR THE INSTALLER: Completed Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
FOR THE INSTALLER: Final Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
START UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
COMPONENT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
ELECTRICAL SEQUENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
MAINTENANCE AND CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
ICEMAKER MAINTENANCE: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
SERVICE DIAGNOSIS: Condition - No Ice Being Produced . . . . . . . . . . . . . . . . . . . . . . . . 22
SERVICE DIAGNOSIS: Condition - Low Ice Production . . . . . . . . . . . . . . . . . . . . . . . . . . 26
REMOVAL AND REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
REMOVAL AND REPLACEMENT: Bearing And Breaker . . . . . . . . . . . . . . . . . . . . . . . . . 28
REMOVAL AND REPLACEMENT: Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
REMOVAL AND REPLACEMENT: Evaporator & Water Seal . . . . . . . . . . . . . . . . . . . . . . . 30
REMOVAL AND REPLACEMENT: Evaporator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
REMOVAL AND REPLACEMENT: Gearmotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
REFRIGERATION SERVICE: HP62 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
ELECTRONIC CONTROL TESTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Parts Lists and Wiring Diagrams are located in the center of this manual, printed on yellow paper.
This manual was printed on recycled paper.
Keep it for future reference.
August 1993
Page 1
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FOR THE INSTALLER: Remote Condenser
19 7⁄8"
ERC DIMENSIONS
Model A B F G
ERC201
33 3⁄8" 10 3⁄4" 16 3⁄4" 11 5⁄8"
ERC402
43 3⁄8" 10 3⁄4" 21 3⁄4" 16 5⁄8"
Installation Limi tations:
This ice system is desig ned to be ins talled indo ors,
in a controlled env iron men t:
Min. Max.
Air Temperature 50
Water Temperature 40
Water Pressure 20 psi 80 psi
Voltage 5% +10%
(Compared to the nameplate)
The temperature limita tio ns do not apply to the
remote condenser. It will work betwe en -20
degrees F, and 120 degrees F.
0
F1000F
0
F1000F
Operating the mach ine outside of the limitations is
misuse and can void the warran ty.
Scotsman Ice Syste ms are desig ne d an d
manufact ure d with the highest regard for saf et y
and performan ce. They meet or exc ee d the
standard s of UL, NSF, and CSA.
Scotsman assumes no liabilit y or resp on sib ility of
any kind for products manufactured by Scotsman
that have been alt ere d in any way, includin g th e
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.
NME1250R
SPECIFICATIONS: REMOTE CONDENSER
Model Use with Basic Electrical
RCE651-32 1 NME1250R 208-230/6 0/1
ERC201-32 SAME 208-230/6 0/1
RCE652-32 1 or 2 NME1250Rs* 208-230/60/ 1
ERC402-32 SAME 208-230/6 0/1
23 13⁄16"
RTE25 Precharged line set, 25’. R-404A
RTE40 Precharged line set, 40’. R-404A
* Two units on one condenser requires a fan relay kit.
Icemaker Nameplate Located On Back Panel
Serial Plate Located Behind Front Panel
December 1995
Page 3
LEVEL THE ASSEMBLY
NME1250R
FOR THE INSTALLER
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,
remove paper covering the bin gasket.
Install bin top if required, follow the
directions included 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.
GASKET
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, left,
and right sides. Secure the machine to the
bin with the hardware provided with the
machine.
Remove the front panel and remove the
styrofoam shipping blocks from under the
gearmotor, the top of the ice chute, and
from between the gearmotor and the right
side panel.
FASTEN THE MACHINE
TO THE BIN WITH THE
HARDWARE SUPPLIED
WITH THE ICEMAKER
June 1994
Page 4
FOR THE INSTALLER: Remote Condenser Installation
LOCATE REMOTE
CONDENSER
ABOVE ICEMAKER
NME1250R
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.
Note: spiral need not be as tight as illustrated.
5. Have the roofing contractor seal the holes in
the roof per local codes.
REMOTE CONDENSER
SPIRAL
EXCESS
TUBING
INSIDE
BUILDING
August 1993
Page 5
SERVICE PORTS
REMOTE
CONDENSER
NME1250R
FOR THE INSTALLER
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. Connect the couplings to the fittings:
••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 "liquid line".
4. Begin tightening the couplings together by
hand, 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.
Note: The system charge is contained in the
machine’s receiver. Holding charges of the same
refrigerant are present in the remote condenser
and pre-charged line sets.
SCHRADER VALVE
TO REMOTE
CONDENSER
NO SHRADER
VALVE
TO ICEMAKER
3/8" LIQUID LINE
1/2" DISCHARGE LINE
June 1994
Page 6
FOR THE PLUMBER
ICEMAKER DRAIN
3/4" FPT
CONFORM TO ALL APPLICABLE CODES
NME1250R
Water Inlet
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.
WATER
INLET
3/8" FLARE
HAND
SHUT OFF
VALVE
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.
CONNECT TO
COLD WATER
FIELD INSTALLED
BIN DRAIN
3/4" FPT
FILTER
(OPTIONAL)
August 1993
Page 7
NME1250R
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 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 rainproof 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.
REMOTE CONDENSER
WATERPROOF
(LIQUID TIGHT)
CONDUIT
ICEMAKER
JUNCTION BOX
POWER
SUPPLY
June 1994
Page 8
FOR THE INSTALLER: Completed Installation
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.
NME1250R
ROOF
CUT-AWAY
INSULATED PRECHARGED
REFRIGERANT TUBING
August 1993
Page 9
LEVELED?
NME1250R
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, and right 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 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 (under
and next to the gearmotor, and on top
of the ice chute) 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 switch is in
the OFF position.
14. Switch on the electrical power.
15. Refer to Pre-Start instructions, the
next page.
POWER SUPPLY?
PLUMBING?
DRAINS?
June 1994
Page 10
START UP
Pre-Start Inspection
1. Remove the front, left , an d righ t side service
panels.
2. Chec k tha t the styrofoa m sh ipp ing bloc ks un de r
the gearmotor, on top of the ice discharge chut e,
and between the gearmotor and the right side
panel have been removed.
3. Inspect the interio r of the mach ine for loos e
screws or wires. Check that no refrige rant lines
are rubbing ea ch oth er. Che ck th at the fan blad e
turns freely (remot e conden ser).
Start Up
NME1250R
4. Check that the refrige ran t line s are properly
installed .
5. Check that the electrica l powe r has been on for
at least 4 hours.
6. Check that the unit is insta lled correctly
according to the fin al check list on page 10.
1. Go through the pre-start inspection.
2. Open the ha nd v alve , ob serve that water enter s
the water reservoir, fills the tube from the reservoir
to the evaporator, and then shuts off. Check for
leaks.
3. Ope n the Kin g Valve.
4. 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 sta rts.
B. After the gearmotor sta rts, the liquid line va lve
will open, the pump down control will close and the
compressor will start .
5. The remote condenser fan turns, and the
condenser begin s to discha rge warm air.
The low side pressure may be 25 to 28 PSIG in
low condensing temperatures, and 35 to 40 PSIG
when in high co nden sing tempera tu re s.
The discharge pressure will depend upon air and
water temperatures, but should be between 180 200 psig when in low con dens ing temperat ure s;
and 320 to 420 psig when in high condensing
temperatures.
7. THERE ARE NO ADJUSTMENTS TO MAKE,
so replace the panels.
8. Clean and/or sanitize the storage bin interior,
wipe off the exterior with a clean, damp cloth.
9 Give the owner/use r the serv ice man ua l, ins truc t
him/her in the operatio n of the unit , and mak e sure
they know who to call for service.
10. Fill out the Customer Evalu ation and War ranty
Registration form, and mail it to Scotsman.
6. The unit should so on be making ice , if de sired
the low side pressure can be checked, it should be
30 psig + or - 4 psig.
April 1995
Page 11
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