Scotsman NS650 Installation Manual

INTRODUCTION

NS650

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.

TABLE OF CONTENTS

Installation

For the Installer

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

For the Plumber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

For the Electrician . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Final Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

The NS650 is a complete ice system that
produces and stores nugget ice.

It features: front service for the condenser,
control box, and water reservoir; a slide out
chassis; an electronic circuit for monitoring ice
and water level; a thermostatic expansion
valve; and R-502 as the refrigerant.

Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Component Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Electrical Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Maintenance and Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Service Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Removal and Replacement

Reservoir and Bin Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Slide Out Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Bearing and Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Water Seal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Evaporator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Gearmotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Electronic Tester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Parts lists and wiring diagrams are in the center of this manual, printed on yellow paper.

December, 1988

Page 1

Minimum

Circuit

Ampacity

25
20

11.97"

Condenser Drain
1/2 FPT
(Water Cooled)

NS650

FOR THE INSTALLER

BACK VIEW

WATER INLET

3/8" FLARE

BIN DRAIN

3/4" FPT
RES DRAIN

38.06"

3/4" FPT

32.08"

15"

3.62"

ELECTRICAL

INLET

Condenser Inlet
3/8 FPT
(Water Cooled)

9.97"

1.77"

5.77"

9.27"
3"

Note: Allow 6"

behind and 6" to
the left of the unit
for air circulation,

utility connections,

and service.

33.14"

When installing a new system, check to be
sure that you have everything you need
before beginning:

Correct Ice Machine (air or water cooled)
All kits, legs, and information required for
the specific job.

The normal finish for the ice machine is
enamel-sandalwood. A stainless steel panel
kit, SPKNS650 may be field installed to
convert the unit to a stainless steel finish.

SPECIFICATIONS: ICE MAKER

Model Number

NS650AE-1A

NS650WE-1A

Diminsions

(w/o legs)

H x W x D

37.5" x 38.06" x 29.5"
same

Basic

Electrical

115/60/1

same

Installation Limitations:

This ice system is designed to be installed
indoors, in a controlled environment:

Min Max
Air Temperature 50
Water Temperature 40

0

F 1000F

0

F 1000F
Water Pressure 20 PSI 80 PSI
Voltage -5% +10%

(Compared to the nameplate)
Operating the machine outside of the

limitations is misuse and can void the warranty.

Ice Type

NUGGET

same

Condenser

Type

Air

Water

Max

Fuse

Size

35
30

Comp.

H.P.

3/4
3/4

Note: Minimum Circuit Ampacity is used to determine wire size and type per national electric code.

December, 1988

Page 2

FOR THE INSTALLER: Environmental Limitations

NS650

Location

After uncrating the machine, and inspecting it
for freight damage, the unit is ready for
installation.

It is important that the machine be installed in
a location where it has enough space for
service access. The unit will require removal
of the top panel for some service, so in under
counter applications, the unit will either have
to be pulled out, or the
countertop will have to
be removable.

Utility installation
needs some space at
the back of the cabinet,
the minimum is 6
inches.

On air cooled models,
the air flow must be
given consideration:
the unit takes in air
from the front, and
exhausts it through the
left and back panels.
These areas require at
least 6 inches of air
space to exhaust the
hot air.

Water Limitations

An ice machine is a food manufacturing plant;
it takes a raw material, water, and turns it into
a food product, ice. The purity of the water is
very important in obtaining pure ice and in
maximizing product life. This section is not
intended as a complete resource for water
questions, but it does offer these general
recommendations:

1. Filter the water used to produce ice. That is
the water going to the "potable" water
connection.

Water filters vary greatly in ability and
function. Install one that filters out suspended
solids to a dimension of 5 microns or smaller.
The finer the filter the better, but finer filters
will clog sooner than course ones. It may be
necessary to add a course filter ahead of the
fine filter to prolong filter life.

2. Check with a water treatment specialist for
a water test, and recommendations regarding

filters and treatment.

Legs

The legs (when used)
may now be installed.
Either use a
mechanical lift to
hoist the cabinet high
enough to screw in
the legs, or carefully
lay the unit on its
back (using portions
of the carton to
protect the back
panel) and screw the
legs in. Note: the legs
must be threaded in
all the way for
maximum strength.

When ready, do not

push the machine
into position, pushing may damage the floor,
and/or the legs mounts. Use a mechanical lift,
and set the unit in it’s selected location.

Level the unit, using the adjustable leg
levelers: both in the front to back and left to
right directions.

Unscrew it’s two screws and take off the front
panel. Remove any packing material
(styrofoam blocks or cardboard sheets) that
may be there.

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.

December, 1988

Page 3

FIELD

SUPPLIED

FILTER

VENTED

DRAIN

NS650

FOR THE PLUMBER

CONFORM TO ALL APPLICABLE CODES

Water Inlet

Air Cooled Models: The

recommended water supply is clean,
cold water. Use 3/8" O.D. copper
tubing, 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 Treatment: In most areas, a
water filter of some type will be useful.
In areas where the water is highly
concentrated with minerals the water
should be tested by a water treatment
specialist, and the recommendations
of the specialist regarding filtration
and/or treatment should be followed.

Water Cooled Models: A separate
3/8" O.D. copper line is
recommended, with a separate hand
valve to control it. It is connected to a
3/8" FPT condenser inlet at the back
of the cabinet. The water pressure to
all lines must always be above 20
psig, and below 120 psig.

HAND

VALVE

WATER

INLET

WATER

COOLED

MODEL

VENTED

DRAIN

CONDENSER

DRAIN

Drains

Air Cooled Models: There are two

3/4" FPT drains at the back of the
cabinet. Drain lines are 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 each drain line, and the ideal
drain receptacle would be a trapped
and vented floor drain. Use only 3/4"
rigid tubing.

Water Cooled Models: In addition to
the above mentioned drains, a
separate condenser drain must be
installed. Connect it to the 1/2"
condenser drain connection at the
back of the cabinet.

CONDENSER

INLET

FLOOR DRAIN

December, 1988

Page 4

FOR THE ELECTRICIAN

POWER

SUPPLY

CONFORM TO ALL APPLICABLE CODES

NS650

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.

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.

JUNCTION

BOX

December, 1988

Page 5

NS650

FOR THE INSTALLER

Final Check List

1. Is the ice system installed indoors in a
location where the air and water temperatures
are controlled, and where they do not exceed
the design limitations?

2. Is there an electrical service disconnect
within sight of the installed machine? Has the
voltage been checked, and compared to
nameplate requirements?

3. Have all the plumbing connections been
made and checked for leaks?

4. Has the machine been leveled?

LEVELED?

5. Is there a minimum of 6" clearance at the
back and left sideof the machine for proper
service access and air circulation? (air cooled)

6. Is the water pressure a minimum of 20 psig?

7.Is the unit grounded?

8. Is there clearance over the top of the
machine for service access?

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

10. Have all of the shipping blocks been
removed?

POWER

SUPPLY?

WATER

SUPPLY?

DRAINS?

December, 1988

Page 6

START UP

NS650

Pre-Start Inspection

1. Remove the front panels.

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

Start Up

1. Go through the prestart inspection.

2. Open the hand valve, observe that water
enters the water reservoir, fills the tube from
the reservoir to the evaporator, and then shuts
off. Check for leaks.

3. Switch the master switch on.
The electrical start up sequence is now on

automatic.
A. There should be a short (15 second) delay

before the gearmotor starts.
B. After the gearmotor starts, the compressor

will start.

4. On air cooled models, the condenser will
begin to discharge warm air, on water cooled
models, the water regulating valve will open,
and warm water will be discharged into the
drain.

3. Inspect the interior of the machine for loose
screws or wires. Check that no refrigerant
lines are rubbing each other. Check that the
fan blade turns freely (air cooled).

4. Check that the unit is installed correctly
according to the final check list (page 7).

The air cooled discharge pressure will depend
upon air and water temperatures, but should
be between 200 psig and 280 psig.

The water cooled discharge pressure should
be constant at about 220 psig.

The above numbers are for new, clean
machines, you can expect to see some values
higher, and some lower between different
units.

6. THERE ARE NO ADJUSTMENTS TO
MAKE, so replace the panels.

7. Clean and/or sanitize the storage bin
interior, wipe off the exterior with a clean,
damp cloth.

8. Give the owner/user the service manual,
instruct him/her in the operation of the unit,
and make sure they know who to call for
service.

5. 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 suction line temperature at the
compressor is normally very cold, nearly to the
point of frost up to the compressor body, but
not on it.

December, 1988

9. Fill out the manufacturers registration card,
and mail it to the Scotsman Factory.

10. Fill out the field quality audit form, and mail
it to the Scotsman factory.

Page 7

CONTROL BOX

COMPRESSOR

ICE ACCESS

DOOR

NS650

COMPONENT DESCRIPTION

Control Box: Contains the electrical controls
that operate the machine.

High Pressure Cut Out Switch: A manual
reset switch sensing the high side refrigeration
pressure. It is set to shut the machine off, and
illuminate the reset switch light if the discharge
pressure should ever exceed 450 psig.

Compressor: The refrigerant vapor pump.
Reservoir: Float operated, it maintains the

water level in the evaporator at a constant
level, it also contains the water level sensor.

Water Level Sensor: Senses if there is water
in the reservoir to make ice out of. Will shut
the machine off it there is none.

ICE CHUTE

ICE LEVEL

SENSORS

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.

Condenser: Air or water cooled, where the
heat removed in ice making is discharged.

Expansion valve: The refrigerant metering
device.

WATER COOLED

EXPANSION

VALVE

GEARMOTOR

HIGH

PRESSURE

CUT OUT

ICE

STORAGE

BIN

RESERVOIR

AND WATER

LEVEL SENSOR

WATER

REGULATING

VALVE

CONDENSER

December, 1988

Page 8

COMPONENT DESCRIPTION: Control Box

TRANSFORMER

NS650

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
for 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 compressor. The reset switch
is mounted on the circuit board.

Transformer: Supplies low voltage to the
circuit board.

START

CAPACITOR

LOW PRESSURE

CUT OUT SWITCH

POTENTIAL

RELAY

Low Pressure Cut Out Switch: A manual

reset control that shuts off the ice machine
when the low side pressure drops below a
preset point, 0-4 psig.

Potential Relay: The compressor start relay.
On/Off Switch: Manual control for the

machine.
Reset Switch: Part of Circuit Board, manual

reset. Lights up when unit shuts off from: ice
discharge chute being overfilled (opening the
microswitch at the top of the chute); low or
high pressure switches opening.

RESET SWITCH

CIRCUIT

BOARD

ON/OFF SWITCH

CONTACTOR

December, 1988

Page 9

NS650

COMPONENT DESCRIPTION

Evaporator: A refrigerated vertical tube filled
with water and containing a water seal and
auger.

Auger: A solid stainless steel double spiral
auger, it pushes the ice crystals up to the top
of the evaporator.

Water Seal: A two part "face" seal, the top half
rotating with the auger, the bottom half
stationary, the sealing action being where the
two seal "faces" meet.

Ice Sweep: A plastic cap with "fingers". It
revolves with the auger to "sweep" the ice into
the ice chute.

Breaker: Where the ice is compressed and
much of the extra water is squeezed out of it
before it is discharged into the bin.

Motor: A permanent split capacitor motor that
drives the gear reducer.

Thrust Bearing: As the ice is pushed up the
evaporator, the auger is thrust down, and
pressure from the auger thrust is taken up by
this bearing.

ICE SWEEP

BEARING

BREAKER

WATER

SEAL

AUGER

EVAPORATOR

December, 1988

Page 10

MOTOR

ELECTRICAL SEQUENCE

NS650

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 compressor relay and auger motor

relay become energized, connecting power
to the windings of the auger motor.

••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 compressor relay 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:

••If the high pressure control (cut out switch)

opens, the machine will stop immediately

(through the relays on the circuit board) and

cause the reset switch on the circuit board

to light up. It must be manually reset at the

control and at the reset switch on the circuit

board.

••If the low pressure control (cut out switch)

opens, the machine will stop immediately

(through the relays on the circuit board) and

cause the reset switch on the circuit board

to light up. It must be manually reset at the

control and at the reset switch on the circuit

board.

••If the spout switch opens, the machine will

stop immediately (through the relays on the

circuit board) and cause the reset switch on

the circuit board to light up. After it recloses

the reset switch on the circuit board must

be manually reset.

••The master switch is the manual control for

the complete machine, but it is not a

service disconnect.

December, 1988

Page 11

ADJUSTMENT OF WATER LEVEL

NS650

OPERATION: Water

Water enters the machine through the 3/8"
male flare at the rear of the cabinet, goes to a
strainer and then to the water reservoir which
it enters through the float valve. The water
then goes out the bottom of the reservoir tank
to the bottom of the evaporator.

Reservoir overflow or evaporator
condensation is routed to the drain. Water
cooled models have a separate water circuit
for the cooling water: it enters the fitting at the
rear, goes to the water regulating valve, then
to the water cooled condenser and down the
drain.

The storage bin has a separate drain tube and
drain fitting.

RESERVOIR

STRAINER

WATER LEVEL

ICE

CHUTE

EVAPORATOR

DRAIN

DRAIN

WATER SCHEMATIC

December, 1988

Page 12

OPERATION: Refrigeration

SUCTION LINE

NS650

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 condenser (air or water
cooled) the gas is cooled by either air or water
and it then condenses into a liquid. This high
pressure liquid then goes through the liquid
line to the expansion valve. The thermostatic
expansion valve meters liquid refrigerant into
the evaporator, the volume of liquid refrigerant
depending upon the temperature of the

Refrigeration Schematic

CONDENSER

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.

LIQUID

LINE

FAN

MOTOR

HIGH PRESSURE
CUT OUT SWITCH

DISCHARGE

LINE

COMPRESSOR

EVAPORATOR

THERMOSTATIC

EXPANSION

VALVE

GEAR

MOTOR

December, 1988

Page 13

NS650

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 procedures.

///////////////////////////////////////////////////////////////////////////
ICEMAKING SYSTEM: In place cleaning

1. Check and clean any water treatment
devices, if any are installed.

2. Pull out and remove the front panel.

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 water should be
between 90-115 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 front panel.

December, 1988

Page 14

MAINTENANCE AND CLEANING

ICE SWEEP

NS650

///////////////////////////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
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.

PULL UP TO

REMOVE PROBE

RESERVOIR

ICE LEVEL SENSORS:

SLIDE UP TO REMOVE

CLEAN THE

LIGHT

SENSORS

CLEAN THE

WATER LEVEL

PROBE

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

CAUTION: THE TIP IS

MADE OF GLASS

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

3. The bearing in the breaker should also be
checked at least two times per year.

A. Check the bearing by:

••removing the ice chute cover

unscrewing the ice sweep

••

••removing the water shed

••using a spanner wrench and unscrewing

the breaker cover.

••unscrewing the auger stud

Inspect the assembly, looking for wear.
See Removal and Replacement to replace

bearing or seals. Reverse to reassemble.

4. Check and tighten all bolts and screws.

SPANNER

WRENCH

BREAKER

COVER

December, 1988

Page 15

ALLEN

SCREWS

NS650

MAINTENANCE AND CLEANING: Auger

5. Clean the air cooled condenser:

/////////////////////////////WARNING//////////////////////////
Disconnect electrical power.
/////////////////////////////////////////////////////////////////////////

Use a vacuum cleaner or coil cleaner if
needed. Do NOT use a wire brush.

Disconnect electrical power, and remove the
filter. The filter may be cleaned or replaced.

Clean the condenser: the condenser may
appear to be clean on the surface, but it can
still be clogged internally. Check with a flash
light from the front to see if light can be seen
though the condenser fins.

/////////////////////////////WARNING//////////////////////////

In some areas, the water supply to the ice
maker will contain a high concentration of
minerals, and that will result in an 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.

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 of these
parts, see REMOVAL AND REPLACEMENT.

Disconnect electrical power, shut off water,
and handle the auger with care, it has
sharp edges.

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

1. To remove the auger, remove the front and
top panels.

2. Use drain hose to drain the evaporator.

3. Remove 3 hex studs holding ice chute
cover to ice chute, and remove cover.

4. Unscrew and remove ice sweep.

5. Loosen band clamp under ice chute, and
remove ice chute from evaporator.

6. Remove 4 allen screws holding breaker to
evaporator.

7. 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.

8. Replace the water seal.

9. Reverse to reassemble.

BREAKER &

BEARING &

AUGER

ASSEMBLY

December, 1988

Page 16

SERVICE DIAGNOSIS: Condition - No Ice Being Produced

NS650

STATUS:

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 3 reset switches, (circuit board, high and low pressure): depress and release

each switch. If the still does not start, check: the spout switch; the high and the low side
pressures.

D. Check the low pressure cut out, if closed, go to E; if open, it could be due to:

••

Low refrigerant charge

NOTHING OPERATES

••The auger not turning

••

Restricted system

••TXV not opening

1. Check the low side pressure, the low pressure cut out opens at pressure below 4 psig.
If open, reset and:

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 will 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.

E. Check the high pressure cut out, if closed go to F; if open check:

1.The pressure control opens at 450 psig. Check the high side pressure, reset the control,
and observe: on water cooled, that water soon begins to flow from the condenser drain;
or, on air cooled, that the fan is forcing air through the condenser. If the unit trips out on
pressures below 450 psig, replace the control. If the pressures rise above the trip out
point, and the unit shuts down:

a. Check for adequate water flow on water cooled, if adequate, clean the interior
of the condenser. If the pressures are still too high replace the water regulating valve.
b. Check for adequate air flow on air cooled. Clean the condenser and (if used) the

filter. 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.

F. Check the spout switch. It opens from excess pressure of ice inside the ice chute: this should
only happen when the machine does not shut off when the ice storage bin is full. This switch will
reset when the ice melts, but the machine will not resart until the reset switch on the circuit board
is pressed.

G. Check the water level in the reservoir. The machine will not run if there is not enough water in
the reservoir.

1. Restore/adjust water level. See the next step.

December, 1988

Page 17

NS650

SERVICE DIAGNOSIS: Condition - No Ice Being Produced

STATUS:

H. 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.

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 Scotsman Electronic 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

NOTHING OPERATES

MORE INFORMATION ON THE TESTER CAN BE FOUND ON THE LAST PAGES OF THE
MANUAL.

December, 1988

Page 18

SERVICE DIAGNOSIS: Condition - No Ice Produced

NS650

STATUS:

A. Check the compressor relay.

The relay is on the circuit board, if it does not supply power to the contactor coil, the
compressor will not run.

1. Check for power at the contactor coil, if none:
a. Check for power at the compressor relay at the circuit board.
If there is power at the relay, but none at the contactor coil,

2. Check the contactor coil. If the coil is open, replace the contactor.

3. Check the auger drive motor centrifugal switch. If, when the drive motor is running,

contact 4 (black wire removed) has no power, and all of the above switches have been
checked, replace the centrifugal switch, or the drive motor.

4. If the compressor relay on the circuit board has power on the NO contact, but not on the COM

contact, replace the circuit board.

B. Check the compressor

1. Check the compressor start relay.

2. Check the start capacitor.

3. Check the windings of the compressor for open windings or shorts to ground.

Replace those items found defective.

GEARMOTOR OPERATES, COMPRESSOR DOES NOT

Check for an open wire between the relay and the contactor.

December, 1988

Page 19

NS650

SERVICE DIAGNOSIS: Condition - Low Ice Production

STATUS:

A. Check the air cooled condenser for dirt. Clean as required. Check the head pressure on water

cooled. Adjust as required. If the head pressure is very high:

1. Air cooled. Check for high air temperatures, or restrictive air flow. Correct as needed.

2. Water cooled. Check for high water temperatures, or low water pressure.
Correct as needed.

3. The refrigerant may contain non condensable gases, purge, evacuate, and recharge per
nameplate.

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: repalace the evaporator or add extra insulation in the form
of foam tape to the evaporator.

EVERYTHING IS OPERATING

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.

.

December, 1988

Page 20

NS650

REMOVAL AND REPLACEMENT: Water Reservoir & Bin Controls

WATER RESERVOIR

FLOAT

MOUNTING

FLANGES

BIN CONTROLS (Ice Level Sensors)

ICE LEVEL SENSORS:

SLIDE UP TO REMOVE

FLOAT

ASSEMBLY

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.

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. Pull each bin control (ice level sensor) out
of the rubber mounting grommets, 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
grommets in the ice chute.

December, 1988

Page 21

NS650

REMOVAL AND REPLACEMENT: Slide Out Chassis

////////////////////////////WARNING///////////////////////////
Disconnect Electrical Power from Machine

Before Proceeding with Removal of
Components.

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

Moving the ice making chassis
out may aid in gaining access to
certain components for service.

The top panel must be
accessible in the installed
location in order to slide out
the chassis.

1. Remove the top panel.

2. Remove the lower left front

ICE SWEEP

panel, the ice access door, the
upper left front panel, and the
cross brace between the upper
& lower front panels.

3. Shut off the water supply,
and disconnect the water line at
the strainer inlet.

4. Check that the electrical
power is OFF, and disconnect
the spout switch leads from the
spout switch.

5. Pull up and remove the ice
level sensors from the ice chute.

6. Unscrew three hex studs,
and remove the ice chute cover.

7. Unscrew the ice sweep, and
remove it.

8. Loosen the band clamp
under the ice chute, and lift up
and remove the ice chute from
the evaporator.

9. Disconnect drain system
from reservoir and drip pan.

10. Remove control box cover,
disconnect incoming electrical
leads and pull leads & conduit
from the control box.

WATER

COOLED

CONDENSER

CONNECTIONS

11. Remove chassis retaining plate from the
front of the chassis.

12. Slide the chassis out to access the
components.

WATER COOLED

BAND CLAMP

December, 1988

Page 22

RETAINING

PLATE

REMOVAL AND REPLACEMENT: Bearing And Breaker

BEARING

Step 5-c and Step 6

NS650

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

To Remove the Breaker Bearing Assembly:
//////////////////////////////WARNING////////////////////////////
Disconnect the electrical power to the

machine at the building source BEFORE
proceeding with any repair.

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

1. Remove top and frontpanels; disconnect
electrical power.

2. Unscrew three studs and remove ice chute
cover.

3. Unscrew and remove ice sweep.

4. Remove insulation halves from outside of
ice chute, loosen band clamp under ice chute,
lift up and remove ice chute.

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

a. Use spanner wrench and unscrew 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, and remove breaker/bearing
assembly from auger & evaporator.

6. Service the bearing. Check for rust, rough
spots and damage.

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

b. Replace lower seals before installing new
bearing in breaker.

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

Replace parts as required. Re-grease bearing
with Scotsman part no. 19-0609-01 bearing
grease. Replace top seal, and check the
o-rings, replace if cut or torn.

7. Reverse to reassemble: specific tools and
materials are required to install properly.

a. Add food grade grease such as Scotsman
part number 19-0569-01 to the seal area
before installing on the auger.

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

SPANNER

WRENCH

Step 5-a Step 5-b

ICE

SWEEP

SEALS

AUGER

STUD

BREAKER

COVER

December, 1988

Page 23

NS650

REMOVAL AND REPLACEMENT: Auger

/////////////////////////////WARNING//////////////////////////
Disconnect electrical power.
////////////////////////////////////////////////////////////////////////

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.

2. Remove ice chute cover.

3. Unscrew ice sweep.

4. Loosen band clamp and remove ice chute
body.

5. 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 and remove auger from
evaporator.

BREAKER

AND AUGER

ASSEMBLY

c. Unscrew 4 allen head cap screws holding
breaker to evaporator.

d. Lift up & remove breaker from evaporator.
e. 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:

1. 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.

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

2. 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.

Note: Sharp

Edges

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.

SLIDE HAMMER

PULLER

THREAD INTO THE

AUGER HERE

December, 1988

Page 24

REMOVAL AND REPLACEMENT: Water Seal

PLACE FOOD

GRADE SEALANT

HERE

NS650

/////////////////////////////WARNING//////////////////////////
Disconnect electrical power.
//////////////////////////////////////////////////////////////////////////
To Remove the Water Seal:

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

1. The gearmotor/evaporator assembly will
have to be exposed.

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.

REMOVAL 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.

REPLACING THE WATER SEAL

WATER SEAL

RETAINING

4. Pull or drive out the lower half of the water
seal.

RING

December, 1988

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.

Page 25

NS650

REMOVAL AND REPLACEMENT: Evaporator

///////////////////////////////////////////////////////////////////////////WARNING////////////////////////////// //////////////////////////////////
Disconnect electrical power before begining removal procedures.
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

To Replace the Evaporator:

(Assuming all the steps for removal of the
thrust bearing, breaker, auger, and water seal
have been performed.)

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")
sweat in the new evaporator at the old 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.

December, 1988

Page 26

BEARING

O-RING

REMOVAL AND REPLACEMENT: Evaporator

EVAPORATOR

WATER

SEAL

RETAINING

RING

SEAL(S)

O-RING

BREAKER

NS650

CAP SCREW

ICE SWEEP

DRIP PAN

GASKET

WATER SHED

GEARMOTOR

ASSEMBLY

O-RING

WATER

SHED

LIP SEAL

BREAKER

COVER

AUGER STUD

THRUST

WASHER

AUGER

December, 1988

Page 27

AUGER DRIVE MOTOR

NS650

REMOVAL AND REPLACEMENT: Gearmotor

//////////////////////////////WARNING////////////////////////////
Disconnect Electrical Power Before

Begining Removal Procedures.
///////////////////////////////////////////////////////////////////////////

SEAL

COVER &

OUTPUT GEAR

ASSEMBLY

WATER SHED

CENTRIFUGAL

SWITCH

ROTOR BEARING

GEAR CASE

SEAL

December, 1988

Page 28

REMOVAL AND REPLACEMENT:

NS650

To Remove and Repair the Gearmotor
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
gearmotor to the base of the machine.

3. Remove the gearmotor from the icemaker.

Note: Save the shims.

Bench test the gearmotor, check for oil leaks,
noise, and amp draw.

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 gearcase cover, output gear,
bearings and output shaft are a 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
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, the
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 was shipped with a certain
number of shims. The number of shims used
must match the number on the gearcase
cover. Do not use the old shims unless there
is a shortage.

Bench test the gearmotor, check for oil leaks,
noise, and amp draw.

December, 1988

Page 29

NS650

Circuit Board Testing

///////////////////////////////////////////////////////////////////////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.

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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.)

If the "Reset" indicator (located in the "reset" switch) is off and the "NO WATER" indicator is lit,
but inspection shows that the water level in the reservoir is above the top of the water level
sensor, OR the "BIN EMPTY" indicator is off while inspection shows that the ice level sensors are
properly aligned, clean and not obstructed, use the tester as follows:

Bin Control

electrical power on, the master switch on, and
all reset switches “reset”.

1. Unplug “photo trans” and “LED” connectors
from the circuit board.

2. Plug “photo trans” and “LED” connectors
from the tester into the circuit board.

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.

Note: All testing is done with the

b. If the light on the tester IS on, move the
“bin full” 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 the Bin Empty light is ON, wait 10-20
seconds for the machine to start, if the
machine starts, replace the ice level sensors.
If the Bin Empty light does not come ON, the
circuit board should be replaced.

SWITCH TO

"FULL"

PHOTO TRANS

LED

LIGHT GOES

ON

LIGHT GOES

ON

LIGHT

GOES OFF

SWITCH TO

"BIN EMPTY"

December, 1988

Page 30

Circuit Board Testing

NS650

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.

LIGHT ON

WATER SENS

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.

If the Bin Empty light is ON, wait 10-20
seconds for the machine to start. The machine
should start.

LIGHT OFF

SWITCH TO

"NO WATER"

SWITCH TO

"WATER"

December, 1988

Page 31