Scotsman NME950R Service Manual

INTRODUCTION

NME950R & FME1200R

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 ice machines covered in this manual are a
remote condenser type modular ice system that
fits a variety of Scotsman storage bins. They
feature: front service for the freezer, gear motor,
control box, water reservoir, and bin control; an
electronic circuit for monitoring ice and water level;
a thermostatic expansion valve; and R-404A as
the refrigerant.

TABLE OF CONTENTS

FOR THE INSTALLER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2

REMOTE CONDENSER SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . Page 3

FOR THE INSTALLER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 4

FOR THE INSTALLER: Remote Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . Page 5

FOR THE INSTALLER: Precharged Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 6

FOR THE INSTALLER: Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P age 7

FOR THE PLUMBER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 8

FOR THE ELECTRICIAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 9

FOR THE ELECTRICIAN: Fan Relay Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 10

FOR THE ELECTRICIAN: Fan Relay Kit Phasing (Do After Start Up) . . . . . . . . . . . . . Page 11

FOR THE INSTALLER: Completed Installation . . . . . . . . . . . . . . . . . . . . . . . . . Page 12

FOR THE INSTALLER: Final Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 13

START UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 14

COMPONENT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 15

COMPONENT DESCRIPTION: Control Box . . . . . . . . . . . . . . . . . . . . . . . . . . Page 16

ELECTRICAL SEQUENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P age 17

OPERATION: Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 18

OPERATION: Refrigeration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 19

MAINTENANCE AND CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P age 21

SERVICE DIAGNOSIS: Condition - No Ice Being Produced . . . . . . . . . . . . . . . . . . Page 24

SERVICE DIAGNOSIS: Condition - Low Ice Production . . . . . . . . . . . . . . . . . . . . Page 27

REMOVAL AND REPLACEMENT: Water Reservoir & Bin Controls . . . . . . . . . . . . . . Page 28

REMOVAL AND REPLACEMENT: Bearing And Breaker . . . . . . . . . . . . . . . . . . . Page 29

REMOVAL AND REPLACEMENT: Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 30

REMOVAL AND REPLACEMENT: Water Seal . . . . . . . . . . . . . . . . . . . . . . . . . Page 31

REFRIGERATION SYSTEM SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P age 32

REMOVAL AND REPLACEMENT: Evaporator . . . . . . . . . . . . . . . . . . . . . . . . . Page 33

REMOVAL AND REPLACEMENT: Gear motor Assembly . . . . . . . . . . . . . . . . . . . Page 34

CIRCUIT BOARD TESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 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

February 1995

Page 1

Remote Condenser

Junction Box

Electrical

Inlet

Water Inlet

3/8" Flare

2.96"

Refrigeran t Cha rge*

208 ounces of R-404A
* Always go by the namep lat e
charge.

NME950R & FME1200R

FOR THE INSTALLER

Either the FME1200R or the NME950R is
designed to fit the followin g Scots man stora ge bins :

••B90 and extensio ns , with bin to p KBT18.

••BH800 using bin top KBT15 (one unit).

••BH800 if using two units, no bin top needed.

•• BH900 usi ng bin t op KB T24 (one uni t )

••BH900 with bin top KBT25 (two unit s side by

side

••BH550 or HTB500 using bin top KBT14.

When installin g a new system, chec k 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 th e

specific job.

Back View

Allow 6" above

machine for service.

Liquid Line
Connectio n

Discharge Line

Connection

SPECIFICATIONS: ICE MAKER

Model Number

FME1200RE-32A

FME1200RE-3A

NME950RE-32A

NME950RE-3A

Dimensions

(w/o bi n)

H X W X D

27" x 21" x 24"

same
same
same

20.84"

Basic

Electrical

208-230/60/1
208-230/60/3
208-230/60/1
208-230/60/3

Drain

3/4" FPT

Ice Type

FLAKE

same

Nugget

same

Cond.

Type

R/Air
R/Air
R/Air
R/Air

3"

5.25"

The Standard Finish is Ename l - Gray. There is an optional stain less steel pan el kit , SPKFM2 1 availab le to
convert the unit to Stainless Steel. It is field insta lled .

December 1995

Page 2

19 7⁄8"

ERC DIMENSIONS

A B F G

33 3⁄8" 10 3⁄4" 16 3⁄4" 11 5⁄8"

NME950R & FME1200R

REMOTE CONDENSER SPECIFICATIONS

Model Use with Basic Electrical
RCE501-32 1 FME1200R OR 1 NME950R 208-230/60/ 1
ERC151-32 SAME SAME
RCE502-32 1 or 2 FME1200Rs or NME950Rs SAME
ERC302-32 SAME SAME

23 13⁄16"

Other Required Items:

RTE25 Precharged line set, 25’, R-404A or
RTE40. Precharged line set, 40’, R-404A.
KCMR230. Fan Relay Kit used when two 230 volt (-32) ice mak ers are on one 230 volt (-32) t wo circu it

condenser.

ICE MAKER NAMEPLAT E

LOCATED ON BACK PANEL

SERIAL PLATE LOCATED

BEHIND FRONT PANEL

December 1995

Page 3

NME950R & FME1200R

FOR THE INSTALLER

Installation Limitations:

This ice system is designed to be installed indoors,
in a controlled environ men t:

Min Max
Air Temperatu re 50
(Not including the remote condenser)
Water Temperature 40
Water Pressure 20 PSIG 80 PSIG
Voltage -5% +10%
(Compared to the nameplate)

Operating the mac hine outsid e of the limit ation s is
misuse and can void the warran ty .

Scotsman Ice Systems are designed and
manufactured with the highest regard for safety
and performan ce . They mee t or excee d the
standards of UL, NSF, and CUL.

Scotsman assu mes no liability or res po nsib ility of
any kind for pro ducts manufact ured by Scotsman
that have been alte red in any way , inclu din 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.
Specifications and design are subject to change
without notice.

0

F100

0

F100

0

0

Afte r u ncrat i ng and in spe c tion , th e unit i s re ady fo r
installat ion . It is important that the machine be
installed in a location where it has enough space

F

F

around it to be accessible for service, usually a
minimum of 6 inches. Try to avoid hot, dirt y and
crowded loca tio ns. Be sure that the location for the
machine is within the limitations described on page

3.

Tip the storage bin on it s bac k, us ing part s of th e
carton to protect the exterior f inish . Inst all th e leg s
into the th re a ded ho le s in the bot to m o f the bin .
Turn the leg levele rs all the way in pre pa rat ion for
leveling lat er. Return th e bin to the uprigh t positio n,
remove paper cov erin g th e bin gask et .

Install the bin top acco rdin g to the direction s with
the bin t op .

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.

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 th e machin e 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 serv ice.

Location

Storage Bin

Ice Maker

December 1995

Page 4

REMOTE CONDENSER

NME950R & FME1200R

FOR THE INSTALLER: Remote Condenser

Location

Limited to a 40 foot or a 25 foot length of
precharg ed refrig era nt tubing connec ting the ice
maker to the remote condenser. The condenser
must be above or level with the ice make r.

Select the best av ailable locat ion, protecting the
condenser from ext reme s of dirt , dust , and sun.

Meet all applicable building codes. Usually the
services of a licensed elect rician are req uire d.

Roof Attachment

1. Install and attach the remo te conde nser to the
roof of the build ing , us ing the meth ods and
practices of const ruct ion that co nf orm to the local
building codes, including havin g a roofin g
contractor se cure the condense r to the roo f.

2. Have an electrician connect the remot e
condenser fan mot or to the ic e maker, us ing the
junction box at the bac k of th e ice ma ker.

PRECHARGED LINE ROUTING

CAUTION

Do not connect precha rge d tubin g until all rou tin g
and forming of the tubing is comp let e. See the
coupling instru ct ion s, pa ge for connect ing
instructio ns .

4. Spiral the excess length of pre charge d tubing
inside the building. Use a horizontal spiral (as
illustrated) to avoid any traps in the lines.

5. Have the roo fi n g contra c t o r seal the hol e s in
the roof per local codes.

Note: Precharged tubing contains a R-404A
holding charg e. The entire refrig erant charge
required for the syst em is conta ine d in the ice
machine.

Tubing illustrat ion shows tigh t spira l; a spiral in the
field depends on tub ing limit ation s. Tigh t sp iral not
required.

Traps in tubin g not req uire d, they are inc lud ed as
part of the Scotsman co nden ser and ice machin e.

1. Each set of precharg ed refrig era nt lines (eit her
25 foot or 40 foot) consis ts of a 3/8 inch diamete r
liquid line and a 1/2 inch diameter discharge line.
Both ends of each line have quick connect
couplings, on e end has a sch rad er valv e
connection, that end goes to the condenser.

Note: The openings in the buildin g ceilin g or wall,
listed in the next step, are the minimum sizes
recommended for passin g the ref rige ran t line s
through .

2. Have the roofing contra ct or cut a minimum hole
for the refrigera nt lines of 1 3/4 inch. Check loca l
codes, a separat e hole may be requ ired for the
electrical power to the condenser.

CAUTION

DO NOT KINK OR CRIMP REFRIGERANT
TUBING WHEN INSTALLI NG 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.

SPIRAL

EXCESS

TUBING

INSIDE

BUILDING

LOCATE REMOTE

CONDENSER

ABOVE ICE MAKER

December 1995

Page 5

NME950R & FME1200R

FOR THE INSTALLER: Precharged Lines

COUPLING INSTRUCTIONS

CAUTION

The couplin gs on the set s of pre ch arg ed lines are
self sealing when inst alle d pro perly. Caref ully
follow the instructio ns :

Initial Connections:

1. Remove the protector caps and plugs. Wipe the
seats and threaded surfaces with a clean cloth to
be certain that no fore ign ma tt er rema ins on the m.

2. Lubricate the inside of the couplings, especia l ly
the O-Rings with refrige ran t oil.

••The 1/2 inch discharge line (schrader valve

end) goes to the remote con dense r fitt ing
marked "discharge line".

••The 3/8 inch liquid line (sch rad er valv e end)

goes to the remote conde nser f itt ing marke d
"liquid line".

••The 1/2 inch discharge line goes to the ice

maker fittin g marked "discharge line".

••The 3/8 inch liquid line goes to the ice make r

fitting marked "liquid line".

Final Connections:

3. Begin tighte ning the coup ling s tog et he r by
hand, then using two wrenches (it is important that
ONLY the nut on the prec harge d line s be turned,
the other parts of the coup ling s must NO T be
allowed to turn or the proce ss 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.

4. Using a marker or pen, mark a line lengthwise
from the coupling union nut to th e bulkhe ad . Then
tighten the coupling and additional 1/4 turn. As the
nut turns, the line will show when 1/4 turn is made.

5. After all connections are made, and after the
king valve has been open ed, ch eck the coup ling s
for leaks.

SERVICE PORTS

REMOTE CONDENSER

3/8" LIQUID LINE

SCHRADER

VALVE

TO REMOTE

CONDENSER

1/2" DISCHARGE

LINE

NO SCHRADER

VALVE

TO ICE MAKER

December 1995

Page 6

FOR THE INSTALLER: Location

SERVICE

ACCESS

ROOF

CUTAWAY

WALL

CUTAWAY

TWO UNITS ON ONE
CONDENSER

EXCESS

PRECHARGED

TUBING INSID E

BUILDING

NME950R & FME1200R

REMOTE

CONDENSER

ICE MAKERS

SERVICE ACCESS

SIDE AND BACK

December 1995

Page 7

NME950R & FME1200R

FOR THE PLUMBER

CONFORM TO ALL APPLICABLE CODES

Water Inlet

SUPPLIED

WATER FILTE R

HAND SHUT

OFF VALVE

CONNECT TO

COLD WATER

FIELD

WATER INLET

3/8" MALE

FLARE

VENT ICE

MAKER

DRAIN,

3/4" FPT

The recommen ded wat er su pply is
cold water. Use 3/8" O.D. copper
tubing, connect to the 3/8" male flare
at the back of the cabin et . Install a
hand valve near the mach ine to
control the water su pply.

Drains

The cabine t has a 3/4" FPT dra in.
connection. The drain is 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. In su lat ion of
this drain line is recomme nd ed.

VENT BIN DRAIN

3/4" FPT

FLOOR DRAIN

December 1995

Page 8

FOR THE ELECTRICIAN

RAIN PROOF

CONDUIT

CONFORM TO ALL APPLICABLE CODES

NME950R & FME1200R

The electrical powe r to the unit is sup plie d throu gh
the junct ion box at the re ar of the machine.

Check the nameplate (loc ated on the back panel)
for the voltage req uire men ts, and for the minimum
circuit ampac ity. The machine requ ires a solid
chassis to earth ground wire.

The ice maker sho uld be connect ed to its own
electrical circuit so it would be individually fused.
Voltage variation must remain within design
limitations , even under starting conditions.

TERMINAL STRIP

FOR REMOTE

CONDENSER

ICE MAKER

JUNCTION BOX

Electrically the remot e condens er fan mot or is
connected to the ice maker at the conta cto r
terminals for the compressor and the fan motor
operates whe ne ver th e compre ssor operates.

Electrical conn ect ion s are made at the junction
box at the back of the ice maker and at the
junction box on the remote condenser.

The remote condenser mus t be wired to the ice
maker in accord an ce with loca l a nd nat ion al
electrical codes with a minimum of 18 Awg. wire
with an ground bonding wire connecte d to the
ground screws pro vided in both the conde nser 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

POWER

SUPPLY

December 1995

Page 9

NME950R & FME1200R

FOR THE ELECTRICIAN: Fan Relay Kit

WARNING

Do all wiring with the electrical power
disconnected.

To install the KCMR23 0 fan rela y kit whe n using
(2) 230 VOLT ice makers and one 230 volt, two
circuit remote condense r.

See the remote condenser nameplate for
current requireme nts to determine wire size
to be used for electrical hookup. Refer to
wiring diagram.

All external wiring should conform to the natio nal,
state and local elec trica l cod es. Usually an
electrical permit and services of a licensed
electrician will be required.

1. Mount the control box in a convenient location.

2. Attach a solid earth ground wire to the gro und
screw.

3. Route connecting wires from the first ice maker
junction box

(marked condenser fan) and connect it to the
KCMR230 terminal st rip marke d: NO. 1 ICE
MACHINE.

4. Route connecting wires from the sec ond
machine jun ctio n box

(marked condenser fan) and connect it to the
KCMR230 terminal st rip marke d: NO. 2 ICE
MACHINE.

5. Route connecting wires from KCMR230
terminal strip marked: TO REMOTE FAN and
connect at the remo te conde nse r junc tio n box.

6. Check phasing of the electrical circuit as follows:
A. The phasing of the wiring MUST now be

checked, as incorre ct ph asing will result in a failure
of the kit relay.

POSSIBL E LOCAT I ON

FOR KCMR230

CONTROL BOX

December 1995

Page 10

NME950R & FME1200R

FOR THE ELECTRICIAN: Fan Relay Kit Phasing (Do After Start Up)

Below is an illustration of the KCMR23 0 termina l
strip. Note that each termin al is marke d:
1-2-3-4-5-6 . For prop er ph as ing :

Terminals #1 and #3 must be connected to the
same side of the line (such as L1)

Terminals #2 and #4 must be connected to the
same side of the line (such as L2).

B. Make a test with a volt meter as follo ws:

1. Switch on ice maker #1 first, then switch on ice
maker #2.

(The compress ors mus t be operating for this tes t.
Do this after start up.)

2. Test with a volt meter between terminals #2
and #4, then between terminals #1 and #3.
Compare the readings obtained to the ones in the
following list:

C. Test terminals 1-2 = Full Volta ge (208-23 0)

Test terminals 1-3 = No voltage
Test terminals 2-3 = Full Voltage
Test terminals 2-4 = No voltage
Test terminals 3-4 = Full voltage
Test terminals 1-4 = Full voltage
D. If there is full voltag e whe re there should be no

voltage, turn of f ice mak er #2, (bo th switch es)
Then turn off ice maker #1 (both swit ches). The
connections at the KCMR230 termina l strip
marked ice maker #1 must be reverse d (pu t the
wire that was on 1 on 2 and the wire that was on 2
on 1).

WARNING

Do all wiring with the electrical power
disconnected.

December 1995

Page 11

NME950R & FME1200R

FOR THE INSTALLER: Completed Installation

A typical inst alla tio n sho uld genera lly ap pear as
illustrated below. The remo te condense r must be
located above th e ice maker and th e prech arged
lines installe d per the inst ructions on page 6.

ROOF

CUT-AWAY

INSULATED
PRECHARGED
REFRIGERANT

TUBING

December 1995

Page 12

FOR THE INSTALLER: Final Check List

1. Is the ice system insta lled
indoors in a location where the
air and water tempe rat ure s are
controlled, and where they do
not exceed the desig n
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 th e rear, left, and
right of the machine for proper
service access and air
circulation?

6. Is the wat er pr e s sure a
minimum of 20 psig?

7. Has the machine bee n
secured to the bin?

8. If two unit s on one conden ser,
has the relay kit been insta lled ?

9. Is there a water shut off valve
installed near the machine?

10. Is the remote condenser
installed per local building codes,
and in a place where it has
adequate ventilation and minimal
solar heat gain?

11. Has all shipping material and
literature (insid e the fro nt panel)
been removed from the units?

12. Have the remote conden se r
and precharged lines been
properly installed?

13. Has the electrica l connec tion
between the ice maker and the
condenser been made?

14. Verify that the master switch is in the OFF
position.

REMOTE

CONDENSER

SECURED?

PLUMBING ?

15. Switch on the electrical power.

16. Refer to Pre-Sta rt ins tru ctions, the next page.

NME950R & FME1200R

ROOF

HOLES

SEALED?

POWER

SUPPLY?

LEVELED?

December 1995

Page 13

NME950R & FME1200R

START UP

Pre-Start Inspection

1. Remove the front, lef t, and right side service
panels.

2. Check that any styrofoam shipping blocks have
been removed.

3. Inspect the int erio r of the mac hin e for loose
screws or wires. Check that no refrige ran t line s
are rubbing each other. Check that the fan blade
turns freely (remote condenser).

Start Up

1. Go through the pre-start inspection.

2. Open the hand valve, obse rve th at wate r ent ers
the water reservo ir, fills the tube fro m the reserv oir
to the evaporator, and then shuts off. Check for
leaks.

3. Ope n the Kin g Valve.

4. Turn the master switch on.
The electrical start up sequence is now on

automatic.
A. There sho uld be a short (15 second ) dela y

before the gear motor starts.
B. After the gear mot or st arts, the liquid line valve

will open, the low pressure control will close and
the compressor will start.

4. Check that the refrigera nt lines are pro per ly
installed .

5. Check that the electrical powe r has been on for
at least 4 hours and that the comp ress or do me is
warm.

6. Check that the unit is installed corre ctly
according to the fin al ch eck list on page 13.

6. The unit should soon be makin g ice, if desired
the low side pressu re may be checke d, it shou ld
be 32 psig + or - 2 psig. The discharge press ure
will depend upon air and water temperatures, but
should be between 200 psig and 280 psig.

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/user the servic e man ual, inst ruc t
him/her in the operation of the unit, and make sure
they know who to ca ll for serv ice.

5. The remote condenser fan turns, and the
condenser begins to discharg e warm air.

10. Fill out the warranty registration, and mail it to
the Scotsman Fact ory.

December 1995

Page 14

COMPONENT DESCRIPTION

GEAR MOTOR

HIGH PRESSURE

CUT OUT

NME950R & FME1200R

Control Box: Contains the electrical controls that

ope rate the machine.

High Pressure Cut Out: A manual reset switch

sensing the hig h side ref rige ration press ure . It is
set to shut the mach ine off at 400 psig .

Evaporator: A vertical stainless steel tube,

refrigerat ed, and wat er fille d. In it, there is a
stainless steel auger.

Reservoir: Float operat ed , it main ta ins the wat er

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.

CONTRO L BOX

Ice Discharge Chute: Directs the ice produced

by the evaporator into the storage bin.

Ice Level Sensor: An electron ic "eye ", it sen ses

the presence of ice in the bottom of the ice
discharge chute. Operates to turn the ice machine
on and off automatic ally as the level of ice in the
bin changes.

Gear Motor: An oil filled, speed redu ct ion

gearbox, driving the auger.

Cleaning Drain Tube: When uncapped and

lowered, dra ins the evapora to r.

Compressor : The refrigera nt vapor pu mp.
Expansion valve: The refrigerant met erin g

device.

COMPRESSOR

EXPANSION VALVE

ICE CHUTE

WATER LEVEL

SENSOR

RESERVOIR

CLEANING

DRAIN TUBE

EVAPORATO R

ICE LEVEL

SENSOR

December 1995

Page 15

NME950R & FME1200R

COMPONENT DESCRIPTION: Control Box

Contactor: A definit e purpose contactor

connecting the comp ress or and th e remote
condenser fan mot or to the powe r sup ply.

Circuit Board: Controlling the ice machine

through sensors and relays. The sensors are : ice
level, and water le vel. The relays are for the gear
motor (with a built in time delay to clear the
evaporato r of ice whe n the unit tu rns off ) and for
the liquid line v alve .

ON/OFF SWITCH

PUMP DOWN CONTRO L

Transformer : Supplies low volt age to the circuit

board.

Pump Down Control: An automatic reset

pressure swit ch connect ed to the low side of the
refrigeration system. Controls the compressor.

Potential Relay: The compresso r sta rt rela y.
On/Off Switch: Manual control fo r the ma chine .

POTENTI AL REL AY

TRANSFORMER

CIRCUIT

BOARD

CONTACT OR

December 1995

Page 16

ELECTRICAL SEQUENCE

NME950R & FME1200R

Refer the wiring diagram as needed.
If the machine is switched off at the master switc h,

but is otherwise ready to go, switching the mast er
switch to ON does the following:

••The bin empty light on the circuit board goes on

••There is a 15 second delay

••I f there is enough water in the reservoir, the

circuit board will allow the mach ine to st art up.

Start up consists of:

••The liquid line relay and auger moto r relay

become energized, connectin g power to the
liquid line sole noid coil and to the winding s of
the auger motor.

••The liquid line solenoid opens, raisin g the low

side pressu re.

••The pump down control closes.

••The auger motor st art s, an d the cent rifu gal

switch closes, connect ing power to the
compressor contactor coil.

••The contactor is energized, connecting power

to the compressor, and the compress or sta rts .

••As ice goes past the ice level se nso rs, the bin

empty light will stay on, and the machine will
continue to run, unless the ice stays between
the sensors for more than 15 seconds (bin full).
At that poin t, the bin emp ty light goes out, an d
the machine shuts down.

Shut Down consists of:

••The liquid line solenoid closes, lowering the

suction pressure.

•• The pump do wn control opens.

••The compress or con tactor opens

••The compressor stops

••The auger motor is run by the circuit board fo r 2

more minute s, cle arin g out ice in the
evap orato r, and then

••The auger motor relay opens, and the auger

motor stops.
If the ice level sensor is clea r (bin empty) for more
than 15 seconds, the machine will start up again.

Another purpose of the circ uit board is to turn th e
machine off if there is not enough water in the
machine.

••When the water level in the rese rvoir fa lls below

the water level sensor, the mac hine will "shut

down"

••When the water refills the reservoir, the

machine will start up again.
Separate from the circuit board:

••The high pressure contro l will stop the machine

immediately if it opens. It is manua lly rese t at

the control.

••The master switch is the manual co nt rol for the

complete mach ine, but it is not a service

disconnect .

December 1995

Page 17

NME950R & FME1200R

OPERATION: Water

Water enters the machine through the 3/8" male
flare at the rear of the cabinet, goes to the water
reservoir which it enters through the float valve.
The water them goes out the bottom of the
reservoir tan k to the botto m of th e evapo rat or.

RESERVOIR

DRAIN TUBE

Reservoir overflow or evaporator condensation is
routed to the drain .

WATER LEVEL

WATER

INLET

DRAIN

December 1995

Page 18

OPERATION: Refrigeration

NME950R & FME1200R

Beginning at the compressor, the refrigerant is
compresse d int o a high te mpe rat ure gas. The
discharge lin e direct s this gas to the condenser.
At the remote condenser the gas is coole d by air
and it then condense s int o a liquid. This high
pressure liqu id th en goes through the liquid line to
the head pressure con tro l valve , int o th e receive r,
through the liq uid line valve an d then thro ugh th e
expansio n va lve.

The thermostatic ex pa nsio n valve met ers liquid
refrigeran t int o the ev ap ora to r, the volu me of liquid
refrigeran t de pend ing upo n the temperature of the
evaporator; warme r evap ora to rs get more
refrigeran t an d colde r evap ora to rs ge t less .

Refrigera tion Sc hem ati c

At the evaporator, the refrigerant enters an area of
relatively low pressure, where it can easily "boil
off" or evaporate. As it evaporates, it absorbs heat
from the evaporat or an d whate ver is in con tact
with it (such as the water insid e it). After the
evaporato r, th e ref rige ran t, now a low pressure
vapor, go es th rou gh the suct ion lin e back to
compresso r, where th e cycle is repe ated .

System Info rmat ion @ 90oF. air and 70oF. water.

••Suction pressure: 35 PSIG

•• Discharge pres sure: 255 PSIG

••Minimum Discharge pressure (low temp): 180 PSIG

Compressor Amps

••3 Phase - 2.8

••Single Phase - 4.3

REMOTE CONDENSER

DISCHARGE

LINE

HEAD

PRESSURE

CONTROL

VALVE

LIQUID LINE

KING

VALVE

DETAIL OF HEAD

PRESSURE CONTROL

VALVE

LIQUID LINE

VALVE

SUCTION

LINE

THERMOSTAT IC

EXPANSION

VALVE

EVAPORATOR

RECEIVER

COMPRESS OR

December 1995

Page 19

From

Condenser

NME950R & FME1200R

OPERATION: Refrigeration

Low Condensing Temperature

The refrigera tio n syste m und er low conde ns er air
temperatures is much the same as it is under
higher temperatures, with the exception that the
resulting low head pressures cause the head
pressure co ntrol to close off the liquid line betwe en
the condenser and the receive r. This forces more

SCHEMATIC OF DISCHARGE PRESSURE

CONTROL VALVE, Normal Temperature

Valve

From

Compressor

Disk

To Receiver

refrigeran t int o the cond enser (with a small amount
of discharge gas go ing into the receiver to
maintain pre ssu re until th e head pres sure is built
back up to the rated gauge pressure of 180 psig).
At that pressu re th e valve op ens up the liquid line
from the condenser to the receiver.

SCHEMATIC OF DISCHARGE PRESSURE

CONTROL VALV E, Low Temperatur e

From

Compressor

To Receiver

From

Condenser

OPERATION: Refrigeration

During the pump down cycle (usually initia ted by
the circuit board de-e nergiz ing the liquid line valve)
the discharge gases flo w throug h their normal path
to the remote conden ser, thro ugh th e head
pressure control, and into the receiver. At this
point the refrig era nt flow is sto pped by the clos ed
liquid line valve . This act ion forc es th e ref rige ran t
into the receive r and kee ps it out of the
compresso r. The pump down con tin ues un til the
low pressure co ntrol tu rns th e compre sso r o ff.

PUMP DOWN

December 1995

Page 20

NME950R & FME1200R

MAINTENANCE AND CLEANING

A Scotsman Ice Syst em rep resents a sizable inves tment of time and money in any compa ny ’s bus iness. In
order to receive th e best retu rn for t hat inve st men t, it MUST re ceiv e period ic maint en ance .
It is the USER’S RESP ONS IB ILITY to see that the unit is properly maintained. It is always pre fe rab le, and
less costly in th e lon g run, to avoid possible down time by keep ing it clea n; adju stin g it as nee ded; and by
replacing worn parts be fore th ey can cause failu re. The follo wing is a list of recomme nd ed maintenance
that will help keep the machin e run nin g with a minimum of prob lems .
Maintenance and Clea ning should be schedule d at a minimum of twice per year.

ICE MAKING SYSTEM: In place cleaning

1. Check and clean any wat er tre at men t device s,
if any are insta lled .

2. Remove screws and fron t an d top panels.

3. Move the ON-OFF switch to OFF.

4. Remove all the ice from the stora ge bin.

5. Remove the cover to the wat er rese rvo ir and
block the float up.

6. Drain the water reservoir and freezer ass emb ly
using the drain tube attached to the freezer water
inlet. Return the drain tub e to its normal up righ t
position and replace the end cap.

7. Prepare the cleaning solution: Mix eight
ounces of Scotsman Ice Machine Clean er with
three quarts of hot water. The solu tio n sh ould be
between 90 and 115 degrees F.

Scotsman Ice Mac hine
Cleaner conta ins aci ds.

These compounds may
cause burns.
If swallowed, DO NOT
induce vomiting. Give
large amounts of of wate r
or milk. Call Physician
immediately . In case of
external contact, flush
with water. Keep out of
the reach of child ren .

8. Slowly pour the cleanin g so lut ion into the wate r
reservoir until it is full. Wait 15 minutes, then
switch the master switch to ON.

9. As the ice maker begins to use water from the
reservoir, co nt inu e to add more cleaning solution
to maintain a full reservoir.

10. After all of the cleaning solution has been
added to the reservoir, and the reservoir is nearly
empty, switch the master swit ch to OFF.

11. After draining the rese rvoir, as in ste p 6, wash
and rinse the water reservo ir.

12. Go thru ste ps 13 -19 to sa nit ize th e ice machin e
water syste m.

13. Mix two gallons of sanitize r solution. Use an
approved sanitizer.

A possible sanit izer so lut ion may be obtaine d by
mixing two gallons of warm (90-1 15
water with 1 ounce of household bleach.

14. Slowly pout the sanitizer solution into the water
reservoir until t he floa t rise s, then switch the
master switch ON.

15. As the ice machine uses water from the
reservoir, co nt inu e to pour t he sanit izer solution
into the reservo ir.

16. After
added to the reservoir, and the reservoir is nearly
empty, switch the master swit ch OFF.

17. Drain the reservoir and thoro ughly wash the
interior of the res ervo ir and cover wit h sanit izer
solution . Be sure th e dra in hose is uprigh t and
capped .

18. Remove the block from the flo at in the wate r
reservoir.

19. Switch the master switch to ON

20. Continue ice makin g for at lea st 15 minu tes, to
flush out any cleaning solution.

1

⁄2 of the sanitizer solut ion has been

o

F.) potable

DO NOT USE any ice produced from the
cleaning solution. Be sure no ice remains in
the bin.

21. Remove all ice from the stora ge bin.

22. Add warm water to the ice storage bin and
thoroughly wash and rins e all surfac es with in th e
bin.

23. Sanitize the bin interior by washing the interior
of the bin with the balance of the sanitizer solution.

24. Switch the master switch ON.

January 1996

Page 21

NME950R & FME1200R

MAINTENANCE AND CLEANING

ICE CHUTE

Moving Parts Hazard.
Disconnect electrical
power before
beginnin g.

1. The bin control uses devices that sense light,
therefore th ey must be kept clea n enou gh so that
they can “see”. At least twic e a year, remove the
bin control sens ors fro m t he base of the ice chute ,
and wipe the inside clea n, as illust rat ed.

2. The ice machin e senses water leve l by a pro be
located in the water reservoir. At least twice a
year, the prob e should be remo ve d from t he
reservoir, and the tip wiped clea n of minera l
build-up.

SLIDE UP

TO REMOVE

RESERVOIR

ICE LEVEL

SENSORS

SLIDE LEFT TO

REMOVE

Inspect the assembly, looking for wear

4. Clean the remote conden ser. Use a vacuum
cleaner or coil cleaner if ne eded .

Do NOT use a wire brush.

5. Check and tighten all bolts and screws.

WATER LEVEL

SENSOR

//////////////////////////////////////

CAUTION: THE TIP

IS MADE OF GLASS

///////////////////////////////////////

3. The top bearing in the bre ak er should also be
checked at lea st

Check the break er be arin g by:

two times per year.

••removing the ice ch ute cov er

••unscrewing the ice sweep

•• removing the water shed

••unscrewing the breaker cover (left hand thread)

•• u nscrewing the auger stud

ICE

SWEEP

BREAKER

COVER

December 1995

Page 22

MAINTENANCE AND CLEANING

NME950R & FME1200R

In some areas the water supply to the ice maker
will have a great deal of minerals in it, and that will
result in an evaporator and auger becoming
coated with these minerals, requiring a more
frequent remova l tha n twice per year. If in doub t
about the conditio n of the evapora to r and auger,
the auger can be removed so the parts can be
inspecte d.

ALLEN

SCREWS

BREAKER

& BEARING

& AUGER

ASSEMBLY

Note: Water filters can filter out suspended solids,
but not dissolved solids . “So ft” wa ter may not be
the complete answe r. Che ck with a wate r
treatmen t specia list regarding wat er tre at men t

For more information on removal and
replacement of these parts, se e REMOVAL
AND REPLACEMENT.

1. To remove the auger, remo ve th e front and top
panels.

2. Push back bail clamp holding ice chute cover to
ice chute, and remove cover.

3. Unscrew and remove ice sweep.

4. Loo s e n ba nd cla m p unde r ic e c hute , and
remove ice chute from evaporator.

5. Remove 4 allen screws h old ing brea ke r to
evapora to r .

6. Pull up to remove auger.
After the auger has been remove d, allow the auger

to dry; if the auger is not bright and shiny, it must
be cleaned.

Clean the auger and eva porator as require d.
DO NOT HONE THE EVAPORATOR.

7. Replace the water seal.

8. Reverse to reassemble.

December 1995

Page 23

NME950R & FME1200R

SERVICE DIAGNOSIS: Condition - No Ice Being Produced

STATUS:

NOTHING OPERATES

A. Check: Voltage to the unit, rest ore it if there is none. Compare to the name plate .
B. Check: The ma ste r switch, switch ON if off.
C. Check: The reset switch (high pressure): depress and release the switch. If the unit still does

not start, check the spout for too much ice, or high side pressure.
D. Check the high pres sure cut out switch.

1. This pressure switch opens at 400 psig . Che ck the hig h sid e pre ssu re, reset the switch and obs erve tha t
the fan is forcing air through the conden ser. If the switch opens at press ures belo w 400 psig, rep lace the
switch.

If the pressures rise above the trip out point , and the unit shut s down:

a. Check for adequate air flow. Clean the condense r. If the air flow is poo r bec ause of the
installatio n, adv ise the us er th at the unit shou ld be mo ve d, or the air arou nd it kept coo ler.

Check the fan motor fo r tight bearings an d prope r rota tio n.

Check that the fan blades are clean, and the fan secure to the fan motor shaft.
b. Check the head pre ssure contro l valve, it should be maint aining a head pre ssu re
above 220 psig. If the unit has the correct charge , and the condens er is clean, and the
refrigeran t line s are not kin ked or twist ed, and the conde ns er is not ove rhe at ed by
external heat load s, the head pre ssu re sho uld be under the trip out point of the head
pressure control switch. If all of the above are found to be good, and the machin e
trips out on high head pres sure , rep lace the head pressure cont rol va lve.

E. Check the water level. If there is not enough water in the reservoir, the water level se nsor will
keep the machine from starting.

a. Check the water level, restore/adjust if low.
b. Check the water level sensor, clean if dirty, (see maintenance).
c. Check the circuit board, se e next page.

If the machine does not start, see the next page.

December 1995

Page 24

NME950R & FME1200R

SERVICE DIAGNOSIS: Condition - No Ice Being Produced

STATUS:

NOTHING OPERATES

F. Check: The gear motor, if it will not run, the compressor will not run. If no power to it: Check:

the indicator lights on the circuit board, the bin empty light should be ON, the no water light
should be OFF .

1. If th e bin empty and no water lights are of f, chec k the transformer.

. Transformer "load" side shou ld have 12 to 15 volts. If not, che ck the "line" side .

a
The line side sho uld have bet wee n 208-230 volts. If the line side has the corre ct

voltage and the load side does not, replace the tran sfo rmer.

2. If the transforme r is good, and the

. Remove sensors by sliding them sideways out of the ice chute. Vis ually insp ect

a

them, clean if needed.

. Look through the ic e chute "eye" hole fo r somet hing blocking th e ice chut e.

b
c. If the unit still does not run , rep lac e the ice level sen so rs.

. If the bin empty light is still OFF, check the circuit board.

d

1. Unplug "opto trans" and "LED " connect ors from the circu it board .

2. Plug "opto trans" and "LED" connectors from the Scotsman Electronic Control

Tester Model NM1 int o the circu it board

a. Move the "bin full" switch on the tester to the full positio n. The bin full
light on the tester shou ld be ON, if no t, re place th e circuit bo ard .
If the bin full light on the tester is ON, move the tes ter swit ch to "bin emp ty "
the light on the tester sh ould go OFF and the bin emp ty ligh t on the circuit
board should go ON. If not, replace the circ uit board. If it does as above,
and the machine still does not run, replace the ice level sensors.

3

. If the transformer is fine , and the "no wate r " light is ON, check the water level sensor.

a. Check the water level in the reservoir, restore if low. If the water level is ok:
b. Remove the water leve l sens or fro m the reserv oir an d clean the tip if dirty .
////////////////////////// ////////////////// ////////////////////// //
CAUTION: THE TIP IS MADE OF GL ASS
////////////////////////// ////////////////////// ///////////////////
c

. Replace the water lev el sen so r. If the no water ligh t is still on, che ck that the

"water sen" plug is firmly plugged into the circuit board.
d. If the no water light is still on,

1. Unplug the "water sen" connect or fro m the circuit board.

2. Plug "water sen" connector from the cont rol teste r into the circuit board.
a. Move the water switch on the tester to "no water" and the no water light
on the circuit board should go on. If not, replace the board..
b. Move the water switch to the" water" position , the no water light should
go off, if not, replace the circuit board.
c. If after the above, the machin e st ill will not run, rep lace the
water level sen sor

bin empty light is OFF, check the ice level sensors.

.

MORE INFORMATION ON THE TESTER MAY BE FOUND AT THE END OF THE MANUAL.

December 1995

Page 25

NME950R & FME1200R

SERVICE DIAGNOSIS: Condition - No Ice Being Produced

STATUS:

GEAR MOTOR OPERATES, COMPRESSOR DOES NOT

A. Check the pump down control switch.

1. This pressure switch opens at 15 psig, and closes at 30 psig. If open check the low side pressure, if after

running the mac hin e the switc h open s at a pressu re higher than 18 psig , rep lace the switch.

The pump down control swit ch could remain open for any of the follo wing reas ons: Lo w refrig era nt charge,

auger not turning , res trict ed system, TXV not opening , liqu id line valve not openin g.

2. Check the low side pre ssu re, aft er st art ing the pump down switch should remain closed at any pre ssu re

higher than 15 psig. If less than that:

a. Check if the

Check for internal damage, rep air an d rep lace in the mach ine.
b. Check for low charge , add some refrigeran t, if the unit begins to operat e, (norma l low
side pressure being abou t 30 psig) st op and look for a leak, rec ove r, rep air, re pla ce the drier,
evacuate, and weigh in the nameplate charge. If, with added charge,
the un it does

Check for a restricted syst em, repla ce the drier, evac uate , and weigh in a

nameplat e cha rge.

Check for a

replace it. Rec ove r, rep lac e th e drier, eva cu at e, and weigh in the name pla te charg e.

c. Check the liquid line solenoid valve, it shou ld have powe r to it, if not:

Check the connection s on the circuit board . The liquid line (or compressor) relay

on the circuit board may have failed. If so, replace the circuit board .

If there is power to the valve, the coil may be open, or the valve jammed , rep lac e

the valve.

auger is turning , if it is no t, remove the gear box and:

not operate:

Thermostatic Expansion Valve that does not open, if defective,

Note: The pump down co nt rol set tin g ch ange d begin nin g with May 199 5 produ ct ion. CO was 2, CI was 17.

December 1995

Page 26

NME950R & FME1200R

SERVICE DIAGNOSIS: Condition - Low Ice Production

STATUS:

EVERYTHING IS OPERATING

A. Check the condenser for dirt. Clean as required. Check the head pressure. If the head

pressure is very high:

1. Check for high air tempe rat ures, or restrict ive air flow. Correct as needed .

2. The refrigerant may contain non condensa ble gase s, recover, evac uate , an d recharge per nameplate.

3. Check the interconne ctin g refrigerant tubing for kinks or twists.
Check that the discharge and liquid line s are ins ula te d, and do not touch eac h othe r
where not insu lat ed .

B. Check the evaporator

1. Clean the evaporator, th e mineral bu ild up will adversely affect the ice mach ine s pro ductio n.

2. Chec k the evapora tor for wa t e r l eaks, re p lace the wate r se al if fo und to be leakin g.

3. Check the low side pressu re; normal is about 30 psig. If low, as sume a refrig era nt leak , loca te , rec over,

repair and recharge .

If no leak, the TXV may be restricted, defective or not adjusted properly. If needed,
replace the TXV, eva cua te , an d rec ha rge per nameplate.

4. Check the insula tio n on the evapo rat or. It should be dry, with no wet spots or frost. If the ins ula tio n has

failed: rep lac e the eva po rat or or add ex tra insulation in the form of fo am ta pe
to th e evaporat or .

C. Check the compressor

1. The compresso r ma y be inef ficie nt.
a. Check the amp draw, if low cha nge the co mpre sso r.
b. if the amp draw is normal, pinch off the suc tio n line to check the pull down capability
of the compressor. The compre ssor should pull down to 25 inch es of vacu um
and hold there for th ree to five min utes .

D. Refrigerant charge

On this model the refrig erant charge is adequa te when ever t he rece iver has en ough liquid refrig era nt to
maintain liqu id ref rige ran t at the TXV. HOWEVE R, the conde ns ing temp era ture will h ave a definit e bearin g
on this. A unit with a margin al charge in summe r, will b e
drops. The only co rrect way to charg e this un it is to weig h in the namep lat e ch arg e.

undercharged when the outside air temperature

December 1995

Page 27

NME950R & FME1200R

REMOVAL AND REPLACEMENT: Water Reservoir & Bin Controls

WATER RESERVOIR

1. Shut off the water supp ly to the ice maker.

2. Remove front panel and rese rvo ir cove r.

3. To remove float only, disco nnec t wat er inle t

compressio n fittin g at reserv oir inlet.

4. Push in the tab behind the rese rvo ir and pull th e

valve assembly up and out of the reservo ir tank.

5. To remove reservo ir, remo ve drain hose from

reservoir.

6. Remove evaporator inlet hose from reservo ir.

7. Remove mounting screws fro m rese rvoir

bracket, and remov e reservo ir from ice maker.

8. Reverse to reassemble.

FLOAT

ASSEMBLY

Locking Tabs

SLIDE BIN

CONTROL S IN

AND OUT

ICE

CHUTE

BIN CONTROLS (Ice Level Sensors)

1. Disconnect electrical power.

2. Remove front panel.

3. Remove control box cover.

4. Locate ice ch ute, at the ba se of the chu te , in
front of an d behin d i t a re two plast i c b in contr o l
mounts.

5. Slide each bin cont rol to the left , and in th e
control box, discon nect the elect rica l leads
connecting the bin cont rol to the circ uit board.

6. Reverse to reas semb le, be certain that the bin
controls are align ed so that the ice leve l sens ors
are visible (cente red ) through the holes in the ice
chut e.

December 1995

Page 28

ALLEN

SCREWS

NME950R & FME1200R

REMOVAL AND REPLACEMENT: Bearing And Breaker

Note: Removal of the auger, water seal,
evaporator and gear motor must begin at the top
of the assembly.

To Remove the Breaker Bearing Assembly:

Moving Parts Hazard.
Disconnect electrical
power before
beginnin g.

1. Remove panels and disconnec t ele ctric al power.

2. Push back bail clamp and remove ice chu te

cover.

3. Unscrew and remove ice sweep.

4. Remove insulat ion halves fro m outside of ice

chute, loosen band clamp under ice ch ute, lift up
and remove ice chute .

5. The breaker may be remov ed from the auger

and evaporator witho ut distu rbin g the auger.
a. Unscrew the breaker cov er fro m b rea ker (lef t

hand threads)
b. Unscrew auger stud from top of auger.

c. Unscrew 4 allen head cap screws holdin g
breaker to evaporator.

d. Lift up, and remove breaker/bearing assembly
from auger & evaporator.

6. Service the bearin g. Chec k for rus t, roug h spots
and da m age.

a. The bearing is pressed into the breaker, to
remove the bearing and replace it an arbor press
is ne eded .

b. Replace lower seals before installing new
bearing in break er.

Note: seals must be pre sse d in with a tool pushing
against the outer edge only, they will not install by
hand.

Replace parts as required . Re-g rea se bearin g with
Scotsman part no. A29123-001 bearing grease.
Replace top seal, and check the o-rings, rep lac e if
cut or torn.

7. Reverse to reassemble: specific tools and
materials are required to inst all pro perly.

a. Add food grade grease such as Scotsman part
number 19-0 56 9-0 1 to the s eal area before
installing on the auger.

b. Check the seal to shaft areas for cuts, or rough
spots: none are permitted.

Note: Flaker Compo n ent s Show n, Nug get Simi lar, but With out Slot ted Collar.

Step 5-a Step 5-b Step 5-c and Step 6

ICE

SWEEP

AUGER

STUD

SLOTT E D

COLLAR

December 1995

Page 29

NME950R & FME1200R

REMOVAL AND REPLACEMENT: Auger

To Remove the Auger:

Turn off the water to the machine, and unclip the
evaporator drain hose, pull it down and drain the
evaporator into the bin or a container.

1. The top panel must be removed , or, if that is not

possible, the gear motor and freezer assembly
must be pulled part of the way out from the
cabinet. To do that:

a. Unclip the electrical wires from the hanger near
the drive motor.

b. Remove the bolt holding the gear motor plate.
c. Pull the assembly out.

2. The auger and breaker/bearing may now be

removed as an assembly.
a. Unscrew 4 allen head cap screws holding

breaker to evaporator.
b. Lift up on

breaker an d
remove auger
from evaporator.

BREAKER

BEARING

ASSEMBLY

Note: If the
auger is stuck,
the breaker must
be removed from
the auger.

The breaker may
be removed from
the au ger and
evaporator without
disturbing the
auger.

a. Unscrew
breaker cov er fro m
breaker (lef t hand
threads)

b. Unscrew auger
stud from top of auger.

c. Unscrew 4 allen head cap screws holdin g
breaker to evaporator.

d. Lift up on breaker to remove from auge r.
If the auger is stuck:
Use a slide hammer type puller to pull on the

auger at the threa de d hole. The size of tha t hole
is 5/8"-18.

Inspect the auger, the critical areas of the auger
are:

a. The auger body. It should be clean and
shining. Sometime s an auger will appear clean
when wet, but after it is dry it will be seen to be
stained . Scrub the auger with ice mach ine clea ne r
and ho t wa ter.

Ice machine clea ne r is an acid. Handle it with
extreme care , ke ep out of the rea ch of child ren.

b. The water seal area. Because the auger has
been removed, the water seal will have to be
replaced. Remove the water seal top half from the
auger, and inspect the auger for mine rals clean as
required.

STOP

SLIDE HAMMER

PULLER REMOVING

AUGER

THREAD

INTO

AUGER

DRIVE SLIDE UP AGAINST

STOP TO LOOSEN AUGER

December 1995

Page 30

WATER SEAL

NME950R & FME1200R

REMOVAL AND REPLACEMENT: Water Seal

To Remove the Water Seal:

(Assuming all step s to remove the auger have
been performed.)

1. The gear motor/ev apora tor asse mbly will hav e

to be pulled away from the machine (if not yet
done).

2. Remove the 4 hex head cap screws holding the

evaporato r to the gear mot or ass emb ly. Lift the
evaporator up and off of the gear motor.

3. Remove the snap ring or wire retainer from the

grove under the water seal.

4. Pull or drive out the lower half of the wat er seal.

To Replace the Water Seal:

1. Lubricate the wate r seal with wate r, and push

the water seal into the bottom of the evaporator
slightly past the gro ve for the snap ring .

2. Replace the snap ring and pull the water seal

down against it.

3. The part of the water seal tha t rot ates with the

auger must also be replaced. Remove th e old part
from the auger and clean the mounting area.

4. Place a small bead of food grade silastic sealant

(such as 732 RTV or Scotsman part numbe r
19-0529-01) on the area of the auger where the
water seal is to be mounted.

5. Carefully push the water seal (rubber side

against the auger shoulder and the silastic .)

CAUTION

Do not get any silastic onto the face of the seal.

REMOVAL OF THE WAT ER SEAL

6. Allow the auger and seal to air dry until the

silastic is dry on the surface.

7. If the origina l water s eal was le ak ing , it wou ld be

a good idea to inspect the interior of the gear
motor.

RETAINING

RING

December 1995

Page 31

VAPOR VAPOR
TEMP. PRESS. TEMP. PRESS.
(DEG F) (PSIG) DEG F) (PSIG)

-20 . . . . 17 70 . . 146

-18 . . . . 18 72 . . 150

-16 . . . . 20 74 . . 155

-14 . . . . 21 76 . . 161

-12 . . . . 23 78 . . 166

-10 . . . . 24 80 . . 171

-8 . . . . 26 82 . . 177

-6 . . . . 28 84 . . 182

-4 . . . . 29 86 . . 188

-2 . . . . 31 88 . . 194

0 . . . . 33 90 . . 200

2 . . . . 35 92 . . 206

4 . . . . 37 94 . . 212

6 . . . . 39 96 . . 219

8 . . . . 41 98 . . 225

10 . . . . 43 100 . 232

12 . . . . 46 102 . 239

14 . . . . 48 104 . 246

16 . . . . 50 106 . 253

18 . . . . 53 108 . 260

20 . . . . 55 110 . 268

22 . . . . 58 112 . 275

24 . . . . 60 114 . 283

26 . . . . 63 116 . 291

28 . . . . 66 118 . 299

30 . . . . 69 120 . 307

32 . . . . 72 122 . 316

34 . . . . 75 124 . 324

36 . . . . 78 126 . 333

38 . . . . 81 128 . 342

40 . . . . 85 130 . 351

42 . . . . 88 132 . 360

44 . . . . 91 134 . 370

46 . . . . 95 136 . 379

48 . . . . 99 138 . 389

50 . . . . 102 140 . 399

52 . . . . 106 142 . 409

54 . . . . 110 144 . 420

56 . . . . 114 146 . 430

58 . . . . 118 148 . 441

60 . . . . 123 150 . 452

62 . . . . 127 152 . 464

64 . . . . 132 154 . 475

66 . . . . 136 156 . 487

68 . . . . 141 158 . 499

NME950R & FME1200R

REFRIGERATION SYSTEM SERVICE

This ice machine uses R-404 A (HP6 2) ref rige ran t and polyole ster oil. Do
NOT use mineral oil in this refrig era tio n syste m.

••R-404A is a "Near Azeot rop e" so liqu id chargin g is req uire d:

••When the system is serviced , a specia l liq uid line drier is required . It is

included with replacement compressors.

••HP62 is not compatible with mineral oil, so these ice mach ine s use

Polyoles ter oil. Po lyole st er oil ab sorb s wat er very easily . When one of
these refrige rat ion systems is open ed for serv ice, it must be re-sealed
as soon as possible (15 minutes maximum).

••Special leak detec tio n equip men t is required to loc ate small ref rige ran t

leaks. Usua lly a lea k det ec to r capa ble of dete ct ing a Halongena te d
refrigerant or HFC-134a will work. Check with the leak detect or
manufacturer if in do ubt.

Access Valves: To use the access valves:

•• Remove the cap from the stem, use a 3/16" allen wrench to check

that the valve is CLOSED. The remo ve the core ca p.

••Close the valve and replace the caps when the job is finished.

The valve must be closed and the caps must be on or the
valve will leak.

ALLEN

WRENCH

Torque Stem

to 6-8 ft. lb..

Pressure-Temperature Chart fo r HP62

Torque Ca p

to 8-12 ft. lb..

ACCESS

VALVE

Torque Cap

to 7-12 ft. lb..

December 1995

Page 32

NME950R & FME1200R

REMOVAL AND REPLACEMENT: Evaporator

Charging Procedures

Extra care mus t be take n whe n recha rgin g th is
remote system. No liquid refrigerant may be
placed in the system at the comp ress or.

To Replace the Evaporator:

(Assuming all the st eps for remo va l of the th rust
bearing, breake r, au ger, an d water sea l hav e been
performed.)

1. Discharge the refrigerant from the ice maker.

2. Unsweat the refrigerant connections:

a) At the thermost atic exp an sion valve out let .

CAUTION

Heat sink the TXV body when unsweating or
resweating the adjacent tubing.

b) At the suction line at the joint abou t 3" fro m the
evapora tor.

3. Remove the evaporator.

4. Unsweat the drier from the liquid line.

5. After installing a new water seal in the new

evaporator ( see “To Replace the Water Seal”)
reswea t th e tu bin g con ne ct ions.

6. Install an new drier in the liqu id line .

7. Evacuate the system un til dehyd rat ed, then

weigh in the nameplate charge. Check for le aks .

8. Install auger, breaker, breaker bearing

assembly, and ice discharge chute in reverse
order of disasse mbly. See “To Reasse mble
Evaporator and Auger”

To Reassemble the Evaporator and Auger

1. After the gear mot or has be en inspected, faste n

the evapora to r to the gear mot or, be sure that the
number of shims indic at ed on the gear cas e cover
is in place betwe en the gea rca se co ver and th e
drip pan gasket . Torqu e the bolts to 110 inch
pounds .

2. Lower the auger int o the ev aporator barre l,

slightly turning it to match up with the drive end.
Do Not Drop Into the Evaporator.

3. Complete the reas semb ly by rev ersing the

disassemb ly for th e break er & th rust bearing
assembly.

DO NOT use the access valve s at the fro nt of the
unit for weighing in the charge. All liquid ref rige ran t
must be weighed into the receiver through the
“front seated” king valve.

PLAC E A BEAD OF
FOOD GRADE
SEALANT HERE

Head Pressure Control Valve

1. Purge system of ref rige rant

2. Break off process tube on the top of the OLD
head pressure control valve.

3. Unsweat old valv e fro m tub ing .

4. Unsweat old drye r from tubing.

5. Install new valve in place, check fo r correc t
connections and be sure the number on the side of
the valve is “180"

6. Wrap the new valve body in wet cloths to heat
sink the valve body.

7. Sweat in the new valve and the new dry er.

8. Ev acuate the system, and wei gh the namep late
charge int o the rece ive r.

December 1995

Page 33

NME950R & FME1200R

REMOVAL AND REPLACEMENT: Gear motor Assembly

Note: The case cover output gear, bearings, and
shaft are one pressed together assembly.

Moving Parts Hazard.
Disconnect electrical
power before
beginning.

To Remove and Repair the Gear motor
Assembly:

(Assuming that the procedures through removal of
the water seal have been performed.)

1. Remove the electrical wires from the gear drive

motor.

2. Unscrew the 4 cap screws holding the gear

motor to the gear motor plate.

3. Remove the gear motor from the ice maker.

To Inspect the gear motor.

A) Remove the cap screws holding the gear motor
case halves together and pry the two cases apart.

B) To lift off the cover, lift up until you can feel
internal contact, then pull the cover towards the
output gear end, and then lift the cover (with drive
motor attached) up and away from the gear motor
case.

Replace as a unit.
C) Inspect the oil, gears, and bearings. If the oil

level and condition is acceptable, quickly check
the gears and bearings. They are likely to be fine if
the oil is.

If there is evidence of water in the oil (rusty
bearings and gears; the oil having a creamy white
appearance; oil level too high) carefully inspect the
bearings and gears. If in doubt about the condition
of a part, replace it. The oil quantity is 14 fluid
ounces, do not overfill.

Note: The gears and bearings are available only
as pressed together sets.

D) After replacing parts as required, (if any)
reassemble the gearcase. The two smaller gears
and the oil should be in the lower case, the output
gear will be with the cover. As you lower the cover
onto the lower case, cover will have to be moved
closer to the second gear after the output gear has
cleared the second gear top bearing.

E) After the case is together, and the locating pins
are secure in both ends, replace all cap screws.

4. Bench test the gear motor, check for oil leaks,
noise, and amp draw.

Charging Procedures

Extra care must be taken when recharging this
remote system. No liquid refrigerant may be
placed in the system at the compressor. DO NOT

RECEIVER

use the access valves at the front of the unit for
weighing in the charge. All liquid refrigerant must
be weighed into the receiver through the “front
seated” king valve".

FRONT SEATED

KING VALVE

SERVICE PORT

December 1995

Page 34

CHARGING

CYLINDER

CIRCUIT BOARD TESTING

SWITCH TO

“FULL”

LIGHT GO ES ON

LIGHT OF F

Moving Parts Hazard.
Disconnect electrical
power before
beginnin g.

NME950R & FME1200R

INSTRUCTIONS FOR USING TESTER
(Optional, order part no. A33942-001)
(These instructions assume that the unit will
not run, and prior investigation of electric
power, controls, and mech anical parts
indicates that the electronic circuit may be at
fault.)

Bin Control

Note: Testing is done with the
electrical power on, the master switch on, and all
the reset switches “reset”.

1. Unp lug “ pho to trans” and “LE D ” connecto r s
from the circuit board.

2. Plug “photo trans” and “LED” connectors from
the tester int o the circuit bo ard .

a. Move the “bin full” switch on the tester to Full.
The light on the tester should be ON.

If the light on the tester is not on, the circuit board
should be replaced.

PHOTO TRANS

LED

b. If the light on the tester IS on, move the “bin full”
switch to Bin Empty . The ligh t on the test er sh ou ld
go OFF, and the Bin Empty ligh t on the circuit
board should go ON.

If the Bin Empty light is ON, wait 10-20 seconds for
the machine to start , if th e mac hin e sta rts , replace
the ice level sensors.
If the Bin Empty light does not come ON, th e circuit
board should be replaced.

LIGHT

GOES ON

SWITCH TO

“BIN EMPTY”

December 1995

Page 35

NME950R & FME1200R

CIRCUIT BOARD TESTING

Water Level

1. Unplug “water sen” connector from control
board.

2. Plug “water sen” connector from Scot sma n
tester int o circuit bo ard .

LIGHT ON

WATER SENS

a. Move “water” switch on tester to No Water
position. The No Water light on the circuit board
should go ON. If not, replace the circuit bo ard .

b. Move the “water” switch on the tester to the
Water position. The No Water light on the board
should go OFF. If not replace the circuit board. If
the light does go off, repla ce th e wat er lev el sen so r.

LIGHT OF F

SWITCH TO

“NO WATER ”

SWITCH TO

“WATER”

December 1995

Page 36