NM650R
INTRODUCTION
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 NM650R is a remote condenser modular
ice system that fits a variety of Scotsman
storage bins. It features: front service for the
freezer, gearmotor, control box, water
reservoir, and bin control; an electronic circuit
for monitoring ice and water level; a
thermostatic expansion valve; and R-502 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Start Up
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Component Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Maintenance & Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Service Diagnosis
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Removal and Replacement
Water Reservoir & Bin Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Thrust Bearing & Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Water Seal
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Evaporator
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Gearmotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Circuit Board Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Parts Lists and Wiring Diagrams are located in the center of this manual, printed on yellow
paper.
December, 1988
Page 1
NM650R
FOR THE INSTALLER
The NM650R is designed to fit the following
Scotsman storage bins:
• B590 and extentions, with bin top KBT18.
• BH800 using bin top KBT15 (one unit).
• BH800 if using two units, no bin top needed.
• BH1000 using bin top KBT16.
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.
Back View
Top View
Allow 6" of space behind the machine
for utility connections.
Allow 6" above
machine for service.
Liquid Line
Connnection
Discharge Line
Connection
Remote Condenser
Junction Box
Electrical
Inlet
Water Inlet
3/8" Flare
20.84"
3"
5.25"
2.96"
Drain
3/4" FPT
SPECIFICATIONS: ICEMAKER
Model Number
NM650RE-32A
NM650RE-1A
Diminsions
(w/o bin)
HXWXD
27" x 21" x 24"
same
Basic
Electrical
Ice Type
Cond.
Type
208-230/60/1
115/60/1
NUGGET
same
R/Air
R/Air
Min.
Max
Circuit
Fuse
Ampacity Size
14.9
25
22.5
35
Comp.
H.P.
3/4
3/4
* Minimum Circuit Ampacity is used to determine wire size and type per National Electric Code.
The Standard Finish is Enamel - Sandalwood. There is an optional stainless steel panel kit,
SPKFM21 available to convert the unit to Stainless Steel. It is field installed.
December, 1988
Page 2
NM650R
FOR THE INSTALLER
Installation Limitations:
This ice system is designed to be installed
indoors, in a controlled environment:
Min
Max
0
Air Temperature
50 F
1000F
(Not including the remote condenser)
Water Temperature
400F
1000F
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.
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.
B590
33"
42.25"
30.5"
21.12"
32"
6"
22.38"
4"
32.5"
4.88"
1.25"
December, 1988
Page 3
21.12"
Drain
3/4"
FPT
NM650R
REMOTE CONDENSER SPECIFICATIONS
1/2" MALE QUICK CONNECT
COUPLING FOR USE WITH
RT625 OR RT640
PRECHARGED LINE SET
22"
32.56"
5.38"
5.75"
19.86"
27.81"
3.5"
6.5"
7.5"
1.94"
5.0"
LIQUID LINE 3/8" MALE
QUICK CONNECT
COUPLING FOR USE WITH
RT625 OR RT640
PRECHARGED LINE SET
MODEL
RC1051-32
RC1052-32
RC551-1
DIMENSIONS
H" X W" X D"
USE WITH
27.8" X 22 X 37.94"
1 NM650R-32
SAME
1 or 2 NM650R’S (-32)
SAME
1 NM650R-1
MINIMUM CIRC.
AMPACITY+
BASIC
ELECTRICAL
2
2
4.1
208-230/60/1
SAME
115/60/1
+Included with the icemakers minimum circuit ampacity.
RT-625 Precharged line set, 25’, R-502
Use this value to determine wire size between icemaker and
fan motor.
RT-640. Precharged line set, 40’, R-502
KCMR230. Fan Relay Kit used when two 230 volt (-32) icemakers are on one 230 volt (-32) two
circuit condenser.
ICEMAKER NAMEPLATE
LOCATED ON BACK PANEL
SERIAL PLATE LOCATED
BEHIND FRONT PANEL
December, 1988
Page 4
NM650R
FOR THE INSTALLER
Location
Typical Storage Bin with Extension and Bin Top
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 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, 1988
Page 5
NM650R
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, 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.
REMOTE CONDENSER
SPIRAL
EXCESS
TUBING
INSIDE
BUILDING
LOCATE REMOTE
CONDENSER
ABOVE ICEMAKER
December, 1988
Page 6
NM650R
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, 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.
4. 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.
5. Connect the 3/8 inch liquid line (schrader
valve end) to the remote condenser fitting
marked "liquid line".
6. Connect the other end of the liquid line to
the icemaker fitting marked "liquid line."
SERVICE PORTS
REMOTE CONDENSER
7. Connect the 1/2 inch discharge line
(schrader valve end) to the remote condenser
fitting marked "discharge line".
8. Connect the other end of the liquid line to
the icemaker fitting marked "discharge line".
9. After all connections are made, and after
the king valve has been opened, check the
couplings for leaks.
3/8" LIQUID LINE
1/2" DISCHARGE
LINE
SCHRADER
VALVE
TO REMOTE
CONDENSER
NO SCHRADER
VALVE
TO ICEMAKER
December, 1988
Page 7
NM650R
FOR THE INSTALLER: Location
TWO UNITS ON ONE
CONDENSER
REMOTE
CONDENSER
ROOF
CUTAWAY
EXCESS
PRECHARGED
TUBING INSIDE
BUIDLING
ICEMAKERS
SERVICE ACCESS
SIDE AND BACK
WALL
CUTAWAY
December, 1988
Page 8
SERVICE
ACCESS
NM650R
FOR THE PLUMBER
CONFORM TO ALL APPLICABLE CODES
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" MALE
FLARE
FIELD
SUPPLIED
WATER FILTER
HAND SHUT
OFF VALVE
Drains
VENT
ICEMAKER
There is one 3/4" FPT drain at the
DRAIN,
3/4" FPT 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
VENT BIN DRAIN
3/4" FPT
FLOOR DRAIN
December, 1988
Page 9
NM650R
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.
TERMINAL STRIP
FOR REMOTE
CONDESNER
ICEMAKER
JUNCTION BOX
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.
POWER
SUPPLY
GROUND
THE
CHASSIS
December, 1988
Page 10
RAIN PROOF
CONDUIT
NM650R
FOR THE ELECTRICIAN: Fan Relay Kit - 230 volt (-32) only
///////////////////////////WARNING/////////////////////////////
Do all wiring with the electrical power
disconnected.
/////////////////////////////////////////////////////////////////////////
To install the KCMR230 fan relay kit when
using (2) FM800R icemakers and one 230
volt, two circuit remote condenser.
Do not use with FM800RE-1A (115v)
See the remote condenser nameplate for
current requirements to determine wire size to
be used for electrical hookup. Refer to wiring
diagram.
All external wiring should conform to the
national, state and local electrical codes.
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
ground screw.
3. Route connecting wires from the first ice
maker junction box
(marked condenser fan) and connect it to the
KCMR230 terminal strip marked: NO. 1 ICE
MACHINE.
4. Route connecting wires from the second
machine junction box
(marked condenser fan) and connect it to the
KCMR230 terminal strip marked: NO. 2 ICE
MACHINE.
5. Route connecting wires from KCMR230
terminal strip marked: TO REMOTE FAN and
connect at the remote condenser junction box.
POSSIBLE LOCATION
FOR KCM230
CONTROL BOX
December, 1988
Page 11
NM650R
FOR THE ELECTRICIAN: Fan Relay Kit Phasing (Do After Start Up)
Only for 230 volt icemakers and 230 volt condenser.
6. Check phasing of the electrical circuit as
Compare the readings obtained to the ones in
follows:
the following list:
A. The phasing of the wiring MUST now be
C. Test terminals 1-2 = Full Voltage (208-230)
checked, as incorrect phasing will result in a
Test terminals 1-3 = No voltage
failure of the kit relay.
Test terminals 2-3 = Full Voltage
Below is an illustration of the KCMR230
Test terminals 2-4 = No voltage
terminal strip. Note that each terminal is
Test terminals 3-4 = Full voltage
marked: 1-2-3-4-5-6. For proper phasing:
Test terminals 1-4 = Full voltage
Terminals #1 and #3 must be connected to
D. If there is full voltage where there should
the same side of the line (such as L1)
be no voltage, turn off icemaker #2, (both
Terminals #2 and #4 must be connected to
switches) Then turn off icemaker #1 (both
the same side of the line (such as L2).
switches). The connections at the KCMR230
B. Make a test with a volt meter as follows:
terminal strip marked icemaker #1 must be
1. Switch on icemaker #1 first, then switch on
reversed (put the wire that was on 1 on 2 and
icemaker #2.
the wire that was on 2 on 1).
(The compressors must be operating for this
///////////////////////////WARNING/////////////////////////////
test. Do this after start up.)
Do all wiring with the electrical power
2. Test with a volt meter between terminals
disconnected.
#2 and #4, then between terminals #1 and #3.
////////////////////////////////////////////////////////////////////////
December, 1988
Page 12
NM650R
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.
ROOF
CUT-AWAY
INSULATED
PRECHARGED
REFRIGERANT
TUBING
December, 1988
Page 13
NM650R
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
REMOTE
CONDENSER
checked for leaks?
SECURED?
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. If two units on one
condenser, has the relay kit
been installed?
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 (inside the front
panel) been removed from the
units?
12. Have the remote condenser and
precharged lines been properly installed?
13. Has the electrical connection between the
icemaker and the condenser been made?
ROOF
HOLES
SEALED?
POWER
SUPPLY?
LEVELED?
PLUMBING?
14. Verify that the master switch is in the OFF
postion.
15. Switch on the electrical power.
16. Refer to Pre-Start instructions, the next
page.
December, 1988
Page 14
NM650R
START UP
Pre-Start Inspection
1. Remove the front, left, and right side
service panels.
4. Check that the refrigerant lines are properly
installed.
2. Check that any styrofoam shipping blocks
have been removed.
5. Check that the electrical power has been
on for at least 12 hours and that the
compressor dome is warm.
3. Inspect the interior of the machine for loose
screws or wires. Check that no refrigerant
lines are rubbing each other. Check that the
fan blade turns freely (remote condenser).
6. Check that the unit is installed corerectly
according to the final check list on page 14.
Start Up
1. Go through the pre-start inspection.
2. Open the hand valve, observe that water
enters the water reservoir, fills the tube from
the reservoir to the evaporator, and then shuts
off. Check for leaks.
6. The unit should soon be making ice, if
desired the low side pressure can be checked,
it should be 30 psig + or - 4 psig. The
discharge pressure 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.
3. Open the King Valve.
4. Turn the master switch on.
The electrical start up sequence is now on
automatic.
A. There should be a short (15 second) delay
before the gearmotor starts.
B. After the gearmotor starts, the liquid line
valve will open, the low pressure control will
close and the compressor will start.
5. The remote condenser fan turns, and the
condenser begins to discharge warm air.
8. Clean and/or sanitize the storage bin
interior, wipe off the exterior with a clean,
damp cloth.
9 Give the owner/user the service manual,
instruct him/her in the operation of the unit,
and make sure they know who to call for
service.
10. Fill out the manufacturers registration
card, and mail it to the Scotsman Factory.
11. Fill out the field quality audit form, and mail
it to the Scotsman factory.
December, 1988
Page 15
NM650R
COMPONENT DESCRIPTION
Control Box: Contains the electrical controls
that operate the machine.
High Pressure Cut Out: A manual reset
switch sensing the high side refrigeration
pressure. It is set to shut the machine off at
450 psig.
Evaporator: A vertical stainless steel tube,
refrigerated, and water filled. In it, there is a
stainless steel auger.
Reservoir: Float operated, it maintains the
water level 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.
Ice Discharge Chute: Directs the ice
produced by the evaporator into the storage
bin.
Ice Level Sensor: An electronic "eye", it
senses the presence of ice in the bottom of
the ice discharge chute. Operates to turn the
ice machine on and off automatically as the
level of ice in the bin changes.
Gear Motor: An oil filled, speed reduction
gearbox, driving the auger.
Cleaning Drain Tube: When uncapped and
lowered, drains the evaporator.
Compressor: The refrigerant vapor pump.
Expansion valve: The refrigerant metering
device.
CONTROL BOX
EXPANSION VALVE
ICE CHUTE
WATER LEVEL
SENSOR
RESERVOIR
COMPRESSOR
CLEANING
DRAIN TUBE
EVAPORATOR
GEAR MOTOR
ICE LEVEL
SENSOR
HIGH PRESSURE
CUT OUT
December, 1988
Page 16
NM650R
COMPONENT DESCRIPTION: Control Box
Contactor: A definite purpose contactor
connecting the compressor and the remote
condenser fan motor to the power supply.
Circuit Board: Controlling the ice machine
through sensors and relays. The sensors are:
ice level, and water level. The relays are for
the gear motor (with a built in time delay to
clear the evaporator of ice when the unit turns
off) and for the liquid line valve. Also includes
the reset switch.
Transformer: Supplies low voltage to the
circuit board.
Pump Down Control: An automatic reset
pressure switch connected to the low side of
the refrigeration system. Controls the
compressor.
Potential Relay: The compressor start relay.
On/Off Switch: Manual control for the
machine.
Reset Switch: Manual reset. When the unit
shuts off from the ice discharge chute being
overfilled (opening the microswitch at the top
of the chute) or if the high pressure cut out
switch opens.
ON/OFF SWITCH
PUMP DOWN CONTROL
POTENTIAL RELAY
CONTACTOR
TRANSFORMER
CIRCUIT
BOARD
RESET SWITCH
December, 1988
Page 17
NM650R
ELECTRICAL SEQUENCE
Refer the wiring diagram as needed.
If the machine is switched off at the master
switch, but is otherwise ready to go, switching
the master switch to ON does the following:
• The bin empty light on the circuit board
goes on
• There is a 15 second delay
• If there is enough water in the reservoir, the
circuit board will allow the machine to start
up.
Start up consists of:
• The liquid line relay and auger motor relay
become energized, connecting power to the
liquid line solenoid coil and to the windings
of the auger motor.
• The liquid line solenoid opens, raising the
low side pressure.
• The pump down control closes.
• The auger motor starts, and the centrifugal
switch closes, connecting power to the
compressor contactor coil.
• The contactor is energized, connecting
power to the compressor, and the
compressor starts.
• As ice goes past the ice level sensors, 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 point, the bin
empty light goes out, and the machine
shuts down.
Shut Down consists of:
• The liquid line solenoid closes, lowering the
suction pressure.
• The pump down control opens.
• The compressor contactor opens
• The compressor stops
• The auger motor is run by the circuit board
for 2.5 more minutes, clearing out ice in the
evaporator, and then
• The auger motor relay opens, and the
auger motor stops.
If the ice level sensor is clear (bin empty) for
more than 15 seconds, the machine will start
up again.
Another purpose of the circuit board is to turn
the machine off if there is not enough water in
the machine.
• When the water level in the reservoir falls
below the water level sensor, the machine
will "shut down"
• When the water refills the reservoir, the
machine will start up again.
Separate from the circuit board:
• The high pressure control will stop the
machine immediately if it opens. It is
manually reset at the control and at the
reset switch on the circuit board.
• The spout switch will stop the machine
immediately if it opens. It is a manual reset
at the reset switch on the circuit board.
• The master switch is the manual control for
the complete machine, but it is not a
service disconnect.
December, 1988
Page 18
NM650R
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 tank to the bottom of
the evaporator.
Reservoir overflow or evaporator
condensation is routed to the drain.
ADJUSTMENT OF THE
WATER LEVEL
WATER RESERVOIR
RESERVOIR
DRAIN TUBE
WATER LEVEL
WATER
INLET
DRAIN
December, 1988
Page 19
NM650R
OPERATION: Refrigeration
Beginning at the compressor, the refrigerant
502 is compressed into a high temperature
gas. The discharge line directs this gas to the
condenser. At the remote condenser the
gas is cooled by air and it then condenses
into a liquid. This high pressure liquid then
goes through the liquid line to the head
pressure control valve, into the receiver,
through the liquid line valve and then through
the expansion valve. The thermostatic
expansion valve meters liquid refrigerant into
the evaporator, the volume of liquid refrigerant
depending upon the temperature of the
evaporator; warmer evaporators get more
refrigerant and colder evaporators get less. 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 evaporator and
whatever is in contact with it (such as the
water inside it). After the evaporator, the
refrigerant, now a low pressure vapor, goes
through the suction line back to compressor,
where the cycle is repeated.
Refrigeration Schematic
REMOTE CONDENSER
DISCHARGE
LINE
LIQUID LINE
DETAIL OF HEAD
PRESSURE CONTROL
VALVE
LIQUID LINE
VALVE
THERMOSTATIC
EXPANSION
VALVE
EVAPORATOR
HEAD
PRESSURE
CONTROL
VALVE
KING
VALVE
RECEIVER
SUCTION
LINE
COMPRESSOR
December, 1988
Page 20
NM650R
OPERATION: Refrigeration
Low Condensing Temperature
The refrigeration system under low condenser
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 control to close off the
liquid line between ththe condenser and the
receiver. This forces more refrigerant into the
condenser (with a small amount of discharge
gas going into the receiver to maintain
pressure until the head pressure is built back
up to the rated gauge pressure of 220 psig).
At that pressure the valve opens up the liquid
line from the condenser to the receiver.
Refrigeration Schematic
REMOTE CONDENSER
DISCHARGE
LINE
LIQUID LINE
DETAIL OF HEAD
PRESSURE CONTROL
VALVE
LIQUID LINE
VALVE
HEAD
PRESSURE
CONTROL
VALVE
THERMOSTATIC
EXPANSION
VALVE
EVAPORATOR
KING
VALVE
SUCTION
LINE
RECEIVER
COMPRESSOR
December, 1988
Page 21
NM650R
OPERATION: Refrigeration
PUMP DOWN
During the pump down cycle (usually initiated
by the circuit board de-energizing the liquid
line valve) the discharge gases flow through
their normal path to the remote condenser,
through the head pressure control, and into
the receiver. At this point the refrigerant flow
is stopped by the closed liquid line valve. This
action forces the refrigerant into the receiver
and keeps it out of the compressor. The
pump down continues until the low pressure
control turns the compressor off.
Refrigeration Schematic
REMOTE CONDENSER
DISCHARGE
LINE
LIQUID LINE
LIQUID LINE
VALVE
THERMOSTATIC
EXPANSION
VALVE
EVAPORATOR
HEAD
PRESSURE
CONTROL
VALVE
KING
VALVE
SUCTION
LINE
RECEIVER
COMPRESSOR
December, 1988
Page 22
NM650R
MAINTENANCE AND CLEANING
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
A Scotsman Ice System represents a sizable investment of time and money in any company’s
business. In order to receive the best return for that investment, it MUST receive periodic
maintenance.
It is the USER’S RESPONSIBILITY to see that the unit is properly maintained. It is always
preferable, and less costly in the long run, to avoid possible down time by keeping it clean;
adjusting it as needed; and by replacing worn parts before they can cause failure. The following
is a list of recommended maintenance that will help keep the machine running with a minimum of
problems.
Maintenance and Cleaning should be scheduled at a minimum of twice per year.
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
////////////////////////////WARNING/////////////////////////////
Electrical power will be ON when doing in
place cleaning. Switch it OFF before
completing the cleaning process.
//////////////////////////////////////////////////////////////////////////
ICEMAKING SYSTEM: In place cleaning
1. Check and clean any water treatment
devices, if any are installed.
2. Remove screws and the front and top
panels.
3. Move the ON-OFF switch to OFF.
4. Remove all the ice from the storage bin.
5. Remove the cover to the water reservoir
and block the float up.
6. Drain the water reservoir and freezer
assembly using the drain tube attached to the
freezer water inlet. Return the drain tube to its
normal upright position and replace the end
cap.
//////////////////////////WARNING///////////////////////////////
Scotsman Ice Machine Cleaner contains
Phosphoric and Hydroxyacetic acids.
These compounds are corrosive and may
cause burns. If swallowed, DO NOT induce
vomiting. Give large amounts of water or
milk. Call Physician immediately. In case
of external contact, flush with water. KEEP
OUT OF THE REACH OF CHILDREN.
/////////////////////////////////////////////////////////////////////////
7. Prepare the cleaning solution: Mix eight
ounces of Scotsman Ice Machine Cleaner with
three quarts of hot water. The solution should
be between 90 and 115 degrees F.
8. Slowly pour the cleaning solution into the
water 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, continue 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 switch to OFF.
11. After draining the reservoir, as in step 6,
wash and rinse the water reservoir.
12. Remove the block from the float in the
water reservoir.
13. Switch the master switch to ON
14. Continue ice making for at least 15
minutes, to flush out any cleaning solution.
Check ice for acid taste - continue icemaking
until ice tastes sweet.
///////////////////////////////WARNING/////////////////////////
DO NOT USE any ice produced from the
cleaning solution.
Be sure no ice remains in the bin.
//////////////////////////////////////////////////////////////////////////
15. Remove all ice from the storage bin.
16. Add warm water to the ice storage bin and
thoroughly wash and rinse all surfaces within
the bin.
17. Sanitize the bin interior with an approved
sanitizer using the directions for that sanitizer.
18. Replace the panels.
December, 1988
Page 23
NM650R
MAINTENANCE AND CLEANING
/////////////////////////////WARNING///////////////////////////
Disconnect electrical power before beginning.
//////////////////////////////////////////////////////////////////////////
1. The bin control uses devices that sense
light, therefore they must be kept clean
enough so that they can “see”. At least twice a
year, remove the bin control sensors from the
base of the ice chute, and wipe the inside
clean, as illustrated.
2. The ice machine senses water level by a
ICE CHUTE
ICE LEVEL
SENSORS
SLIDE LEFT TO
REMOVE
SLIDE UP
TO REMOVE
RESERVOIR
Inspect the assembly, looking for wear
4. Clean the remote condenser. Use a
vacuum cleaner or coil cleaner if needed.
Do NOT use a wire brush.
5. Check and tighten all bolts and screws.
WATER LEVEL
SENSOR
//////////////////////////////////////
CAUTION: THE TIP
IS MADE OF GLASS
///////////////////////////////////////
ICE
SWEEP
probe located in the water reservoir. At least
twice a year, the probe should be removed
from the reservoir, and the tip wiped clean of
mineral buildup.
3. The top bearing in the breaker should also
be checked at least two times per year.
Check the breaker bearing by:
• removing the ice chute cover
• unscrewing the ice sweep
• removing the water shed
• using a spanner wrench and unscrewing
the breaker cover (left hand thread)
• unscrewing the auger stud
SPANNER
WRENCH
December, 1988
Page 24
BREAKER
COVER
NM650R
MAINTENANCE AND CLEANING
In some areas the water supply to the
icemaker will have a great deal of minerals in
it, and that will result in ann evaporator and
auger becoming coated with these minerals,
requiring a more frequent removal than twice
per year. If in doubt about the condition of the
evaporator and auger, the auger can be
removed so the parts can be inspected.
ALLEN
SCREWS
BREAKER
& BEARING
& AUGER
ASSEMBLY
Note: Water filters can filter out suspended
solids, but not dissolved solids. “Soft” water
may not be the complete answer. Check with
a water treatment specialist regarding water
treatment
For more information on removal and
replacement of these parts, see REMOVAL
AND REPLACEMENT.
1. To remove the auger, remove the front and
top panels.
2. Remove 3 hex studs holding ice chute
cover to ice chute, and remove cover.
3. Unscrew and remove ice sweep.
4. Loosen band clamp under ice chute, and
remove ice chute from evaporator.
5. Remove 4 allen screws holding breaker to
evaporator.
6. Pull up to remove auger.
After the auger has been removed, allow the
auger to dry; if the auger is not bright and
shiny, it must be cleaned.
Clean the auger and evaporator as required.
DO NOT HONE THE EVAPORATOR.
7. Replace the water seal.
8. Reverse to reassemble.
December, 1988
Page 25
NM650R
SERVICE DIAGNOSIS: Condition - No Ice Being Produced
STATUS: NOTHING OPERATES
A. Check: Voltage to the unit, restore it if there is none. Compare to the nameplate.
B. Check: The master switch, switch ON if off.
C. Check: The 2 reset switches (circuit board and high pressure): depress and release each
switch. If the unit still does not start, check the spout switch, or high side pressure.
D. Check the high pressure cut out switch.
1. This pressure switch opens at 450 psig. Check the high side pressure, reset the switch and
observe that the fan is forcing air through the condenser. If the switch opens at pressures below
450 psig, replace the switch. If the pressures rise above the trip out point, and the unit shuts down:
a. Check for adequate air flow. Clean the condenser. If the air flow is poor because of the
installation, advise the user that the unit should be moved, or the air around it kept cooler.
Check the fan motor for tight bearings and proper rotation.
Check that the fan blades are clean, and the fan secure to the fan motor shaft.
b. Check the head pressure control valve, it should be maintaining a head pressure
above 220 psig. If the unit has the correct charge, and the condenser is clean, and the
refrigerant lines are not kinked or twisted, and the condenser is not overheated by
external heat loads, the head pressure should be under the trip out point of the head
pressure control switch. If all of the above are found to be good, and the machine
trips out on high head pressure, replace the head pressure control valve.
E. Check the spout switch.
1. This switch will open if the bin control (ice level sensor) does not shut the machine off when the
ice storage bin is full of ice: ice backs up in the ice chute, and internal pressure opens the switch,
stopping the machine. After the ice melts, the switch will reset but the machine will not restart until
the reset switch in the control box is pressed. If the machine does start, check:
a. The ice level sensors, they may need cleaning (see maintenance).
b. The circuit board, see next page.
F. Check the water level. If there is not enough water in the reservoir, the water level sensor 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, see next page.
If the machine does not start, see the next page.
December, 1988
Page 26
NM650R
SERVICE DIAGNOSIS: Condition - No Ice Being Produced
STATUS: NOTHING OPERATES
G. 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 the bin empty and no water lights are off, check the transformer.
a. Transformer "load" side should have 12 to 15 volts. If not, check the "line" side.
The line side should have between 208-230 volts. If the line side has the correct
voltage and the load side does not, replace the transformer.
2. If the transformer is good, and the bin empty light is OFF, check the ice level sensors.
a. Remove sensors by sliding them sideways out of the ice chute. Visually inspect
them, clean if needed.
b. Look through the ice chute "eye" hole for something blocking the ice chute.
c. If the unit still does not run, replace the ice level sensors.
d. If the bin empty light is still OFF, check the circuit board.
1. Unplug "opto trans" and "LED" connectors from the circuit board.
2. Plug "opto trans" and "LED" connectors from the Scotsman Electronic Control
Testor Model NM1 into the circiut board (see page 35).
a. Move the "bin full" switch on the tester to the full position. The bin full
light on the tester should be ON, if not, replace the circuit board.
If the bin full light on the tester is ON, move the tester switch to "bin empty"
the light on the tester should go OFF and the bin empty light on the circuit
board should go ON. If not, replace the circuit 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 water" 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 level sensor from the reservoir and clean the tip if dirty.
////////////////////////////////////////////////////////////////////
CAUTION: THE TIP IS MADE OF GLASS
///////////////////////////////////////////////////////////////////
c. Replace the water level sensor. If the no water light is still on, check 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" connector from the circuit board.
2. Plug "water sen" connector from the control tester 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 machine still will not run, replace the
water level sensor
MORE INFORMATION ON THE TESTOR MAY BE FOUND ON PAGE 38.
December, 1988
Page 27
NM650R
SERVICE DIAGNOSIS: Condition - No Ice Being Produced
STATUS: GEARMOTOR OPERATES, COMPRESSOR DOES NOT
A. Check the pump down control switch.
1. This pressure switch opens at 6-10 psig, and closes at 16-20 psig. If open check the low side
pressure, if after running the machine the switch opens at a pressure higher than 10 psig, replace
the switch.
The low pressure control switch could remain open for any of the following reasons: Low
refrigerant charge, auger not turning, restricted system, TXV not opening, liquid line valve not
opening.
2. Check the low side pressure, the low pressure cut out switch should remain closed at any
pressure higher than 10 psig. If less than that:
a. Check if the auger is turning, if it is not, remove the gearbox and:
Check for internal damage, repair and replace in the machine.
b. Check for low charge, add some refrigerant, if the unit begins to operate, (normal low
side pressure being about 30 psig) stop and look for a leak, repair, replace the drier,
evacuate, and weigh in the nameplate charge. If, with added charge,
the unit does not operate:
Check for a restricted system, replace the drier, evacuate, and weigh in a
nameplate charge.
Check for a Thermostatic Expansion Valve that does not open, if defective,
replace it. Replace the drier, evacuate, and weigh in the nameplate charge.
c. Check the liquid line solinoid valve, it should have power to it, if not:
Check the connections on the circuit board. The liquid line (or compressor) relay
on the circuit board may have failed. If so, replacethe circuit board.
If there is power to the valve, the coil may be open, or the valve jammed, replace
the valve.
December, 1988
Page 28
NM650R
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 temperatures, or restrictive air flow. Correct as needed.
2. The refrigerant may contain non condensable gases, purge, evacuate, and recharge per
nameplate.
3. Check the interconnecting refrigerant tubing for kinks or twists.
Check that the discharge and liquid lines are insulated, and do not touch each other
where not insulated.
B. Check the evaporator
1. Clean the evaporator, the mineral build up will adversely affect the ice machines production.
2. Check the evaporator for water leaks, replace the water seal if found to be leaking.
3. Check the low side pressure; normal is about 30 psig. If low, assume a refrigerant leak, locate,
repair and recharge.
If no leak, the TXV may be restricted, defective or not adjusted properly. If needed,
replace the TXV, evacuate, and recharge per nameplate.
4. Check the insulation on the evaporator. It should be dry, with no wet spots or frost. If the
insulation has failed: replace the evaporator or add extra insulation in the form of foam tape
to the evaporator.
C. Check the compressor
1. The compressor may be inefficient.
a. Check the amp draw, if low change the compressor.
b. if the amp draw is normal, pinch off the suction line to check the pull down capability
of the compressor. The compressor should pull down to 25 inches of vacuum
and hold there for three to five minutes.
D. Refrigerant charge
On this model the refrigerant charge is adequate whenever the receiver has enough liquid
refrigerant to maintain liquid refrigerant at the TXV. HOWEVER, the condensing temperature will
have a definate bearing on this. A unit with a marginal charge in summer, will be undercharged
when the outside air temperature drops. The only correct way to charge this unit is to weigh in the
nameplate charge.
December, 1988
Page 29
NM650R
REMOVAL AND REPLACEMENT: Water Reservoir & Bin Controls
WATER RESERVOIR
1. Shut off the water supply to the icemaker.
2. Remove front panel and reservoir cover.
3. To remove float only, pry the mounting
flanges apart enough to lift one float pivot pin
out of the flange hole, and pull float up and out
of the reservoir.
4. To remove reservoir, disconnect water inlet
compression fitting at reservoir inlet.
5. Remove drain hose from reservoir.
6. Remove evaporator inlet hose from
reservoir.
7. Remove mounting screws from reservoir
bracket, and remove reservoir from icemaker.
8. Reverse to reassemble.
ICE
CHUTE
FLOAT
ASSEMBLY
FLOAT
MOUNTING
FLANGES
SLIDE BIN
CONTROLS IN
AND OUT
BIN CONTROLS (Ice Level Sensors)
1. Disconnect electrical power.
2. Remove front panel.
3. Remove control box cover.
4. Locate ice chute, at the base of the chute,
in front of and behind it are two plastic bin
control mounts.
5. Slide each bin control to the left, and in the
control box, disconnect the electrical leads
connecting the bin control to the circuit board.
6. Reverse to reassemble, be certain that the
bin controls are aligned so that the ice level
sensors are visible (centered) through the
holes in the ice chute.
December, 1988
Page 30
NM650R
REMOVAL AND REPLACEMENT: Bearing And Breaker
d. Lift up, and remove breaker/bearing
Note: Removal of the auger, water seal,
assembly from auger & evaporator.
evaporator and gearmotor must begin at the
top of the assembly.
6. Service the bearing. Check for rust, rough
spots and damage.
To Remove the Breaker Bearing Assembly:
a. The bearing is pressed into the breaker, to
//////////////////////////////WARNING////////////////////////////
remove
the bearing and replace it an arbor
Disconnect the electrical power to the
press is needed.
machine at the building source BEFORE
b. Replace lower seals before installing new
proceeding with any repair.
bearing
in breaker.
//////////////////////////////////////////////////////////////////////////
Note: seals must be pressed in with a tool
1. Remove panels and disconnect electrical
pushing against the outer edge only, they will
power.
not install by hand.
2. Unscrew three studs and remove ice chute
Replace parts as required. Re-grease bearing
cover.
with Scotsman part no. 19-0609-01 bearing
3. Unscrew and remove ice sweep.
grease. Replace top seal, and check the
4. Remove insulation halves from outside of
o-rings, replace if cut or torn.
ice chute, loosen band clamp under ice chute,
7. Reverse to reassemble: specific tools and
lift up and remove ice chute.
materials are required to install properly.
5. The breaker may be removed from the
a. Add food grade grease such as Scotsman
auger and evaporator without disturbing the
part number 19-0569-01 to the seal area
auger.
before installing on the auger.
a. Use spanner wrench and unscrew breaker
b. Check the seal to shaft areas for cuts, or
cover from breaker (left hand threads)
rough spots: none are permitted.
b. Unscrew auger stud from top of auger.
c. Unscrew 4 allen head cap screws holding
breaker to evaporator.
Step 5-a
Step 5-b
Step 5-c and Step 6
ICE
SWEEP
BREAKER
AUGER
STUD
SPANNER
WRENCH
ALLEN
SCREWS
December, 1988
Page 31
NM650R
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 gearmotor 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 gearmotor
plate.
c. Pull the assembly out.
2. The auger and breaker/bearing may now be
removed as an assembly.
a. Unscrew 4 BREAKER
allen head cap BEARING
screws holding ASSEMBLY
breaker to
evaporator.
b. Lift up on
breaker and
remove auger
from evaporator.
Note: If the
auger is stuck,
the breaker
must be
removed from
the auger.
The breaker may
be removed from
the auger and
evaporator without disturbing the auger.
a. Use spanner wrench and unscrew
stainless breaker cover from breaker (left
hand threads)
b. Unscrew auger stud from top of auger.
c. Unscrew 4 allen head cap screws holding
breaker to evaporator.
d. Lift up on breaker to remove from auger.
If the auger is stuck:
Use a slide hammer type puller to pull on the
auger at the threaded hole. The size of that
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. Sometimes an auger will appear
clean when wet, but after it is dry it will be
seen to be stained. Scrub the auger with ice
machine cleaner and hot water.
///////////////////////////WARNING//////////////////////////////
Ice machine cleaner is an acid. Handle it with
extreme care, keep out of the reach of
children.
//////////////////////////////////////////////////////////////////////////
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
minerals clean as required.
STOP
SLIDE HAMMER
PULLER REMOVING
AUGER
THREAD
INTO
AUGER
December, 1988
Page 32
DRIVE SLIDE UP AGAINST
STOP TO LOOSEN AUGER
NM650R
REMOVAL AND REPLACEMENT: Water Seal
To Remove the Water Seal:
(Assuming all steps to remove the auger have
been performed.)
1. The gearmotor/evaporator assembly will
have to be pulled away from the machine (if
not yet done).
2. Remove the 4 hex head cap screws holding
the evaporator to the gearmotor assembly.
Lift the evaporator up and off of the gearmotor.
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 water
seal.
To Replace the Water Seal:
1. Lubricate the water seal with water, and
push the water seal into the bottom of the
evaporator slightly past the grove for the snap
ring.
2. Replace the snap ring and pull the water
seal down against it.
3. The part of the water seal that rotates with
the auger must also be replaced. Remove the
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
number 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.
/////////////////////////////////////////////////////////////////////////
6. Allow the auger and seal to air dry until the
silastic is dry on the surface.
7. If the original water seal was leaking, it
would be a good idea to inspect the interior of
the gearmotor.
To Replace the Evaporator:
(Assuming all the steps for removal of the
thrust bearing, breaker, auger, and water seal
have been performed.)
December, 1988
Page 33
REMOVAL OF THE WATER SEAL
WATER SEAL
RETAINING
RING
NM650R
REMOVAL AND REPLACEMENT: Evaporator
1. Discharge the refrigerant from the ice
maker.
2. Unsweat the refrigerant connections:
a) At the thermostatic expansion valve outlet.
//////////////////////////////CAUTION///////////////////////////
Heat sink the TXV body when unsweating
or resweating the adjacent tubing.
//////////////////////////////////////////////////////////////////////////
b) At the suction line at the joint about 3" from
the evaporator.
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”)
resweat the tubing connections.
6. Install an new drier in the liquid line.
7. Evacuate the system until dehydrated, then
weigh in the nameplate charge. Check for
leaks.
8. Install auger, breaker, breaker bearing
assembly, and ice discharge chute in reverse
order of disassembly. See “To Reassemble
Evaporator and Auger”
To Reassemble the Evaporator and Auger
1. After the gearmotor has been inspected,
fasten the evaporator to the gear motor, be
sure that the number of shims indicated on the
gear case cover is in place between the
gearcase cover and the drip pan gasket.
Torque the bolts to 110 inch pounds.
2. Lower the auger into the evaporator barrel,
slightly turning it to match up with the drive
end. Do Not Drop Into the Evaporator.
3. Complete the reassembly by reversing the
disassembly for the breaker & thrust bearing
assembly.
To Remove and Repair the Gearmotor
Assembly:
(Assuming that the procedures through
removal of the water seal have been
performed.)
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
PLACE A BEAD
OF FOOD GRADE
SEALANT HERE
Head Pressure Control Valve
1. Purge system of refrigerant
2. Break off process tube on the top of the
OLD head pressure control valve.
3. Unsweat old valve from tubing.
4. Unsweat old dryer from tubing.
5. Install new valve in place, check for correct
connections and be sure the number on the
side of the valve is “220"
6. Wrap the new valve body in wet cloths to
heat sink the valve body.
7. Sweat in the new valve and the new dryer.
8. Evacuate the system, and weigh the
nameplate charge into the receiver.
NOT use the schrader valves at the front of
the unit for weighing in the charge. All liquid
R-502 must be weighed into the receiver
through the “front seated” king valve.
December, 1988
Page 34
NM650R
REMOVAL AND REPLACEMENT: Gearmotor Assembly
WATER SHED
SEAL
DRIVE MOTOR
OUTPUT GEAR,
OUTPUT SHAFT,
AND BEARINGS
BEARING
SEAL
GASKET
///////////////////////////WARNING/////////////////////////
Disconnect Electrical Power Before
Begining
/////////////////////////////////////////////////////////////////////
GEARCASE
December, 1988
Page 35
NM650R
REMOVAL AND REPLACEMENT: Gearmotor Assembly
1. Remove the electrical wires from the gear
drive motor.
2. Unscrew the 4 cap screws holding the
gearmotor to the gearmotor plate.
3. Remove the gearmotor from the icemaker.
To Inspect the gearmotor.
A) Remove the cap screws holding the
gearmotor 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.
Note: The case cover output gear, bearings,
and shaft are one pressed together assembly.
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
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
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.
Note: If the gearcase cover was replaced, the
replacement part MAY HAVE BEEN shipped
with a certain number of shims. The number of
shims used must match the number written
on the gearcase cover. If there was no
number on the cover, and no shims with
the part, do not use any shims. Do not use
the old shims.
4. Bench test the gearmotor, check for oil
leaks, noise, and amp draw.
NOT use the schrader valves at the front of
the unit for weighing in the charge. All liquid
R-502 must be weighed into the receiver
through the “front seated” king valve".
FRONT SEATED
KING VALVE
RECEIVER
SERVICE PORT
December, 1988
Page 36
CHARGING
CYLINDER
NM650R
CIRCUIT BOARD TESTING
INSTRUCTIONS FOR USING TESTER MODEL FC1
(Optional, order part no. A33942-001)
(These instructions assume that the unit will not run, and prior investigation of electric power,
controls, and mechanical parts indicates that the electronic circuit may be at fault.)
///////////////////////////////////////////////////////////////////////WARNING/////////////////////////////////////////////////////////////////////
These procedures require the machine to be connected to the power supply. The voltages of the
electronic circuit are very low, but HIGHER VOLTAGES ARE PRESENT IN THE UNIT. Do not
touch anything but the tester while the unit is being checked out. Make all connections to the
circuit board with the ELECTRICAL POWER OFF.
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
If the light on the tester is not on, the circuit
Bin Control Note: Testing is done with the
board should be replaced.
electrical power on, the master switch on, and
all the reset switches “reset”.
b. If the light on the tester IS on, move the
1. Unplug “ photo trans” and “LED” connectors
“bin full” switch to Bin Empty. The light on the
tester should go OFF, and the Bin Empty light
from the circuit board.
on the circuit board should go ON.
2. Plug “photo trans” and “LED” connectors
from the tester into the circuit board.
If the Bin Empty light is ON, wait 10-20
seconds for the machine to start, if the
a. Move the “bin full” switch on the tester to
machine starts, replace the ice level sensors.
Full. The light on the tester should be ON.
If the Bin Empty light does not come ON, the
circuit board should be repalced.
PHOTO TRANS
LIGHT GOES ON
LED
LIGHT
GOES ON
SWITCH TO
“FULL”
LIGHT OFF
SWITCH TO
“BIN EMPTY”
December, 1988
Page 37
NM650R
CIRCUIT BOARD TESTING
Water Level
1. Unplug “water sen” connector from control
board.
2. Plug “water sen” connector from Scotsman
tester into circuit board.
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
board.
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, replace the
water level sensor.
LIGHT OFF
LIGHT ON
WATER SENS
SWITCH TO
“NO WATER”
SWITCH TO
“WATER”
December, 1988
Page 38