Scotsman NME1250 Installation Manual

INTRODUCTION

NME1250

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 NME1250 features: front service for the
evaporator, gearmotor, control box, water reservoir
and bin control; electronic circuitry for monitoring
ice and water level; a thermostatic expansion
valve; and HP62 as the refrigerant.

TABLE OF CONTENTS

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

FOR THE INSTALLER: Environmental Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

FOR THE PLUMBER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

FOR THE ELECTRICIAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

FOR THE INSTALLER: Final Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

START UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

COMPONENT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

ELECTRICAL SEQUENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

MAINTENANCE: Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

SERVICE DIAGNOSIS: Condition - No Ice Being Produced . . . . . . . . . . . . . . . . . . . . . . . . 18

SERVICE DIAGNOSIS: Condition - Low Ice Production . . . . . . . . . . . . . . . . . . . . . . . . . . 21

REMOVAL AND REPLACEMENT: Water Reservoir & Bin Control . . . . . . . . . . . . . . . . . . . . 22

REMOVAL AND REPLACEMENT: Bearing And Breaker . . . . . . . . . . . . . . . . . . . . . . . . . 23

REMOVAL AND REPLACEMENT: Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

REMOVAL AND REPLACEMENT: Water Seal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

REMOVAL AND REPLACEMENT: Evaporator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

REMOVAL AND REPLACEMENT: Gearmotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

REFRIGERATION SERVICE: HP62 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

CIRCUIT BOARD TESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Parts Lists and Wiring Diagrams are located in the center of this manual, printed on yellow paper.

This manual was printed on recycled paper.
Keep it for future reference.

Note this symbol when it appears.

It marks a potential hazard.

August 1993

Page 1

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FOR THE INSTALLER: Environmental Limitations

NME1250

Installation Limitations:

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

Min. Max.

0

Air Temperature 50
Water Temperature 40
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.

F 1000F

0

F 1000F

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 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.

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.

August 1993

Page 3

LEVEL THE
ASSEMBLY

NME1250

FOR THE INSTALLER

Location

After uncrating and inspection, the unit
is ready for installation. It is important
that the machine be installed in a
location where it has enough space
around it to be accessible for service,
and minimum of 6" be allowed to the
left, right and top for air circulation on air
cooled models. Try to avoid hot, dirty
and crowded locations. Be sure that the
location for the machine is within the
limitations described on page 3.

Storage Bin

Tip the storage bin on its back, using
parts of the carton to protect the exterior
finish. Install the legs into the threaded
holes in the bottom of the bin. Turn the
leg levelers all the way in preparation
for leveling later. Return the bin to the
upright position, remove paper covering
the bin gasket.

Install bin top if required.
Note: Do not push bin into position, but

lift it there. Pushing a bin, especially one
with ice in it, can cause damage to the
legs and the leg mounts.

GASKET

Ice Maker

The machine is heavy, so the use of a
mechanical lift is recommended for
lifting the machine high enough to install
on top of the bin. After the unit is placed
on the bin, line it up so it is even with
the back, left, and right sides. Secure
the machine to the bin with the
hardware provided with the machine.

FASTEN THE MACHINE

TO THE BIN WITH THE

HARDWARE SUPPLIED

WITH THE ICE MAKER

June 1994

Page 4

FOR THE PLUMBER

Use only 3/4" rigid tubing.

CONFORM TO ALL APPLICABLE CODES

NME1250

Water Inlet

Air Cooled Models: 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

COOLED

WATER INLET

HAND SHUT

OFF VALVE

CONNECT TO

COLD WATER

3/8" FLARE

Drains

Air Cooled Models: There is one 3/4" FPT drain at
the back of the cabinet, the drain line is of the
gravity type, and 1/4 inch per foot fall is an
acceptable pitch for the drain tubing. There should
be a vent at the highest point of the drain line, and
the ideal drain receptacle would be a trapped and
vented floor drain.

FILTER, FIELD

INSTALLED

(OPTIONAL)

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.

ICE MAKER

DRAIN

3/4" FPT

BIN DRAIN

3/4" FPT

Water Cooled Models: In addition to the above

mentioned drain, a separate condenser drain must
be installed. Connect it to the 1/2" condenser drain
connection at the back of the cabinet.

Storage Bin: A separate gravity type drain needs
to be run, similar to the air cooled drain.

Insulation of this drain line is recommended.

August 1993

Page 5

ICE MAKER

JUNCTION BOX

NME1250

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.

POWER

SUPPLY

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.

THIS UNIT MUST BE

GROUNDED

June 1994

Page 6

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?

NME1250

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

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

4. Has the machine and bin been leveled?

5. Is there a minimum of 6" clearance at the
rear, left, and right of the machine for
proper service access and air circulation?

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

7. Has the machine been secured to the
bin?

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

LEVELED?

POWER

SUPPLY?

PLUMBING?

MACHINE

SECURE TO

BIN?

9. Have the shipping blocks been removed
from under the gearmotor, the top of the ice
chute, and from between the gearmotor and
the right side panel?

DRAINS?

August 1993

Page 7

NME1250

START UP

Pre-Start Inspection

1. Remove the front, and left side service panels.

2. Check that the styrofoam shipping blocks under
the gearmotor, on top of the ice discharge chute,
and between the gearmotor and the right side
panel 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.

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 8).

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.

The air cooled discharge pressure will depend
upon air and water temperatures, but should be
between 220 psig and 330 psig.

The water cooled discharge pressure should be
constant at about 245 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.

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.

5. The unit should soon be making ice, if desired,
the low side pressure can be checked: it should be
between 30 and 32 psig. Low side pressure may
be lower than 30 PSIG when the ambient is under

o

70

F. and higher than 32 when ambient is over

o

90

F.

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.

9. Fill out the Customer Evaluation and
Registration form, and mail it to Scotsman.

June 1994

Page 8

COMPONENT DESCRIPTION

CLEANING DRAIN

TUBE

NME1250

Control Box: Contains the electrical controls that

operate the machine.
Low Pressure Cut Out: "A" models only: A

manual reset switch set to shut the machine off
should the low side pressure go below 0-4 psig.

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.

CONTROL BOX

Ice Discharge Chute: Directs the ice made 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.
Condenser: Air or water cooled, where the heat

removed in ice making is discharged.
Expansion valve: The refrigerant metering

device.

LOW PRESSURE

CUT OUT

RESERVOIR

WATER LEVEL SENSOR

(INSIDE RESERVOIR)

STRAINER

COMPRESSOR

HIGH PRESSURE

CUT OUT

CONDENSER

ICE CHUTE

EXPANSION

VALVE

EVAPORATOR

GEARMOTOR

ICE LEVEL

SENSOR

August 1993

Page 9

CONTACTOR

NME1250

COMPONENT DESCRIPTION: Control Box

Contactor: A definite purpose contactor
connecting the compressor 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 compressor.

Transformer: Supplies low voltage to the circuit
board.

Low Pressure Control (Cut Out): A manual reset
control to shut 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.

LOW PRESSURE

CUT OUT

ON/OFF SWITCH

TRANSFORMER

CIRCUIT BOARD

POTENTIAL RELAY

June 1994

Page 10

COMPONENT DESCRIPTION

BEARING

EVAPORATOR

NME1250

Evaporator: A refrigerated vertical tube filled

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.

BREAKER

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 split phase motor that drives the gear
reducer.

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

AUGER

ICE CHUTE

WATER SEAL

ICE LEVEL

SENSORS

DRIVE MOTOR

August 1993

Page 11

NME1250

ELECTRICAL SEQUENCE: "A" Models

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 and pressing the start reset switch
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

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) opens,

the machine will stop immediately (through the

relays on the circuit board). It must be manually

reset.

••If the low pressure control (cut out) opens, the

machine will stop immediately (through the

relays on the circuit board). It must be manually

reset.

••The master switch is the manual control for the

complete machine, but it is not a service

disconnect.

June 1994

Page 12

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 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 then down the drain.

NME1250

Note: The water level may be checked by comparing

the level of water in the reservoir to the line molded

into the side of the reservoir. The water level should

be between

The water level may be adjusted by bending the arm

1

" above and

⁄

8

of the float as needed.

1

" below the line.

⁄

4

STRAINER

RESERVOIR

ICE

CHUTE

EVAPORATOR

DRAIN

WATER LEVEL

EVAPORATOR

DRAIN

WATER SCHEMATIC

August 1993

Page 13

NME1250

OPERATION: Refrigeration

Beginning at the compressor, the refrigerant 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
evaporator; warmer evaporators get more
refrigerant and colder evaporators get less.

REFRIGERATION SYSTEM SCHEMATIC

AIR COOLED

CONDENSER

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.

SUCTION LINE

FAN MOTOR

DISCHARGE

LIQUID LINE

LINE

THERMOSTATIC

EXPANSION

VALVE

EVAPORATOR

COMPRESSOR

June 1994

Page 14

NME1250

CLEANING & SANITIZING

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.

Electrical power will be ON when doing in
place cleaning.

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.

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.

Scotsman Ice Machine
Cleaner contains acids.
These compounds 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.

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.

To Sanitize:

Repeat steps 8-11, except use an approved
sanitizing solution in place of the cleaning solution.
A possible sanitizing solution may be made by
mixing 1 ounce of household bleach to 2 gallons
of warm (95

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.

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.

o

F. to 115oF.) water.

8. Slowly pour the cleaning solution into the water
reservoir until it is full. Wait 15 minutes, then
switch the master switch to ON.

August 1993

Page 15

SLIDE IN

AND OUT

NME1250

MAINTENANCE

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
build-up.

WATER

RESERVOIR

WATER LEVEL

SENSOR

ICE CHUTE

ICE LEVEL

SENSORS

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

or seals. Reverse to reassemble.

4. Clean or replace the air cooled condenser
filter.Clean the air cooled condenser. Use a
vacuum cleaner or coil cleaner if needed.

Do NOT use a wire brush.

5. Check and tighten all bolts and screws.

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

Check the bearing by:

••removing the ice chute cover

••unscrewing the ice sweep

••removing the water shed

••unscrewing the breaker cover

••

unscrewing the auger stud

ICE

SWEEP

BREAKER

COVER

BREAKER

June 1994

Page 16

MAINTENANCE: Auger

ALLEN HEAD

SCREWS

BREAKER &

BEARING &

AUGER

ASSEMBLY

Hazardous Moving
Parts.

Moving auger can cause
personal injury.
Disconnect electrical
power before beginning.

In some installations the water supply to the
icemaker will be so concentrated with dissolved
minerals, (such as calcium carbonate) that as ice
is made, the evaporator and auger become
coated with the minerals, requiring a more frequent
cleaning 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.

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

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

3. Unscrew and remove ice sweep.

4. Remove ice chute from evaporator.

5. Remove 4 allen head screws holding breaker to
evaporator.

6. Pull up on breaker to remove auger.
Allow the auger to dry, the stainless steel of the

auger and evaporator must be clean and bright.
Clean the auger and evaporator as required. DO
NOT HONE THE EVAPORATOR.

7. Replace the water seal.

NME1250

8. Reverse to reassemble.

Handle auger with care, it has sharp edges.

Air Cooled Models:

Clean the Air Filter and Condenser as needed to
keep the machine operating efficiently. A minimum
of 2 times per year is recommended.

1. Disconnect power.

2. Remove the right side service panel.

3. Remove the filter pad, wash it out with water
and/or replace it.

4. Check the fins for dirt, clean as needed until
light can be seen through the condenser.

5. Replace panel and reconnect power.

August 1993

Page 17

NME1250

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 reset switches, (high and low pressure): depress and release each switch. If the

still does not start, check the high and the low side pressures.
D. Check the low pressure cut out, if closed go to E, if it is open, it could be due to:

••Low refrigerant charge

••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 30-32 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 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.

June 1994

Page 18

NME1250

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

Tester Model NM1 into the circuit 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

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

August 1993

Page 19

NME1250

SERVICE DIAGNOSIS: Condition - No Ice Being Produced

STATUS:

GEARMOTOR OPERATES, COMPRESSOR DOES NOT

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,

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

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.

June 1994

Page 20

SERVICE DIAGNOSIS: Condition - Low Ice Production

NME1250

STATUS:

EVERYTHING IS OPERATING

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 30-32 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 from of foam tape to
the evaporator.

C. Check the compressor.

1. The compressor may be inefficient.
a. Check the amp draw, normal is about 5.7 to 6.4. 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

.

August 1993

Page 21

NME1250

REMOVAL AND REPLACEMENT: Water Reservoir & Bin Control

WATER RESERVOIR

1. Shut off the water supply to the icemaker.

2. Remove front panel and reservoir cover.

3. Disconnect water inlet compression fitting at

reservoir inlet.

4. To remove float valve, push in on locking tab

and lift float valve out of reservoir tank.
Note: there is a plunger inside the float valve that

is available separately.

5. To remove reservoir, 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.

FLOAT VALVE

PLUNGER

LOCKING

TAB

SLIDE BIN

CONTROLS IN

AND OUT

ICE

CHUTE

BIN CONTROLS (Ice Level Sensors)

1. Disconnect electrical power.

2. Remove front panel.

3. Remove control box cover.

4. Locate ice 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 cube
chute.

June 1994

Page 22

REMOVAL AND REPLACEMENT: Bearing And Breaker

SEALS

NME1250

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

Hazardous Moving
Parts.

Moving auger can cause
personal injury.
Disconnect electrical
power before beginning.

To Remove the Breaker Bearing Assembly:

1. Remove panels and disconnect electrical power.

2. Push back bail clamp 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. 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. A29123-001 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.

Step 5-a Step 5-b Step 5-c

ICE

SWEEP

AUGER

STUD

BREAKER

COVER

August 1993

Page 23

BEARING

THREAD

INTO

AUGER

NME1250

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.

Hazardous Moving
Parts.

Moving auger can cause
personal injury.
Disconnect electrical
power before beginning.

1. The top panel must be removed.

2. Push bail clamp off of ice chute cover, remove

ice chute cover.

3. Unscrew ice sweep.

4. Remove ice

BREAKER

AND

AUGER

ASSEMBLY

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.

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. 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 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.

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.

SLIDE

HAMMER

PULLER

June 1994

Page 24

REMOVAL AND REPLACEMENT: Water Seal

REMOVAL OF THE 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 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.

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.

WATER

SEAL

RETAINING

RING

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

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.

NME1250

August 1993

Page 25

NME1250

REMOVAL AND REPLACEMENT: Evaporator

To Replace the Evaporator:

REPLACING THE WATER SEAL

PLACE A BEAD OF

FOOD GRADE

SEALANT HERE

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

1. Recover 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
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.

ROTATING HALF OF

WATER SEAL

June 1994

Page 26

REMOVAL AND REPLACEMENT: Gearmotor

oil having a creamy white appearance; oil level too
high) carefully inspect the bearings and gears. If

Electrical Shock
Hazard.

Electrical power can
cause personal injury.
Disconnect electrical
power before beginning.

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 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

WATER

SHED

COVER

in doubt about the condition of a part, replace it.
The oil quantity is 14 fluid ounces, do not overfill.

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

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

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

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

NME1250

MOTOR

BEARING

SEAL

FIRST GEAR

SECOND GEAR

August 1993

Page 27

GASKET

GEAR CASE

NME1250

REFRIGERATION SERVICE: R-404a

THIS ICE MACHINE USES R-404a (HP62)
REFRIGERANT AND POLYOLESTER
COMPRESSOR OIL.

DO NOT USE MINERAL OIL IN THIS
REFRIGERATION SYSTEM.

••HP62 is a "Near Azeotrope", and therefore

liquid charging is preferred.

••When the system is serviced, a special liquid

line dryer is required.

••Polyolester oil absorbs water very easily, and

therefore when the system is opened for
service, it must be re-sealed as soon as
possible (15 minutes maximum).

••Special leak detection equipment is required to

locate small refrigerant leaks. Usually a leak
detector capable of detecting a Halogenated
refrigerant or HFC-134A will work. Check with
the leak detector manufacturer if in doubt.

••As with any other refrigerant, do NOT mix HP62

with pressurized air when leak testing.

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

-20 . . . . . . 17 70 . . . . . . 146

-18 . . . . . . 18 72 . . . . . . 150

-16 . . . . . . 20 74 . . . . . . 155

-14 . . . . . . 21 76 . . . . . . 161

-12 . . . . . . 23 78 . . . . . . 166

-10 . . . . . . 24 80 . . . . . . 171

-8 . . . . . . 26 82 . . . . . . 177

-6 . . . . . . 28 84 . . . . . . 182

-4 . . . . . . 29 86 . . . . . . 188

-2 . . . . . . 31 88 . . . . . . 194

0 . . . . . . 33 90 . . . . . . 200

2 . . . . . . 35 92 . . . . . . 206

4 . . . . . . 37 94 . . . . . . 212

6 . . . . . . 39 96 . . . . . . 219

8 . . . . . . 41 98 . . . . . . 225

10 . . . . . . 43 100 . . . . . 232

12 . . . . . . 46 102 . . . . . 239

14 . . . . . . 48 104 . . . . . 246

16 . . . . . . 50 106 . . . . . 253

18 . . . . . . 53 108 . . . . . 260

20 . . . . . . 55 110 . . . . . 268

22 . . . . . . 58 112 . . . . . 275

24 . . . . . . 60 114 . . . . . 283

26 . . . . . . 63 116 . . . . . 291

28 . . . . . . 66 118 . . . . . 299

30 . . . . . . 69 120 . . . . . 307

32 . . . . . . 72 122 . . . . . 316

34 . . . . . . 75 124 . . . . . 324

36 . . . . . . 78 126 . . . . . 333

38 . . . . . . 81 128 . . . . . 342

40 . . . . . . 85 130 . . . . . 351

42 . . . . . . 88 132 . . . . . 360

44 . . . . . . 91 134 . . . . . 370

46 . . . . . . 95 136 . . . . . 379

48 . . . . . . 99 138 . . . . . 389

50 . . . . . . 102 140 . . . . . 399

52 . . . . . . 106 142 . . . . . 409

54 . . . . . . 110 144 . . . . . 420

56 . . . . . . 114 146 . . . . . 430

58 . . . . . . 118 148 . . . . . 441

60 . . . . . . 123 150 . . . . . 452

62 . . . . . . 127 152 . . . . . 464

64 . . . . . . 132 154 . . . . . 475

66 . . . . . . 136 156 . . . . . 487

68 . . . . . . 141 158 . . . . . 499

Pressure-Temperature Chart for HP62

June 1994

Page 28

REFRIGERATION SERVICE

Access Valves

Note: There are no valve

cores in this valve.

NME1250

General Information:

Work on the refrigeration system should only be
done when it is certain that the system needs
repair.

••Refrain from checking refrigeration

pressures without reason. Visual inspection
of the water system, observation of the ice
formation, amp draw, voltage, and other
techniques will lead to proper diagnosis.
Scotsman also recommends that, at the time of
initial start up, gauges not be used.

••If gauges must be used, don’t always check the

high side pressure. If the condenser is clean
and seems to be operating correctly, it most
likely is. The low side pressure is more
important on an ice machine than the high side.

••If gauges must be used, use very short hoses to

minimize refrigerant discharged into the air.

••Refrigerant should not be added except as a

way to determine the proper operation of the
product. If the system was low on refrigerant,
there is a leak, and it must be found and
repaired.

••This system has a critical charge, it must be

recharged with the correct amount of refrigerant
as listed on the nameplate of the ice machine,
or performance will suffer.

••Anytime the refrigeration system has been

opened, the dryer should be replaced. Note:
Only a HFC type dryer should be used.

••When brazing the tubing connections to

components such as the TXV, the component
must be protected by heat sink material.

Recover, reclaim or recycle refrigerant. The
method chosen is up to the service company. Any
refrigerant placed into a Scotsman ice machine
must meet ARI spec 700-88. Reclaim programs
are available through most refrigerant wholesalers.

Access Valves: To use the access valves:
Remove the cap from the stem, use a 3/16" allen

wrench to check that the valve is CLOSED. The
remove the core cap.

Close the valve and replace the caps when the
job is finished. The valve must be closed and
the caps must be on or the valve will leak.

Allen

Wrench

Torque Stem to

6-8 ft. lb.

Torque Stem Cap to

8-12 ft. lb.

Torque

Core Cap to

7-12 ft. lb.

August 1993

Page 29

NME1250

CIRCUIT BOARD TESTING

Electrical Shock Hazard.

Electrical power can
cause personal injury.
Disconnect electrical
power before connecting
tester.

INSTRUCTIONS FOR USING TESTER, (Optional, order part no. A33942-001)

(These instructions assume that the unit will not run, and prior investigation of electric power, controls,
and mechanical parts indicates that the electronic circuit may be at fault.)

If 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

Note: All testing is done with the
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.

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"

LIGHT GOES

ON

PHOTO

TRANS

LED

LIGHT GOES

ON

LIGHT
GOES

OFF

SWITCH TO

"BIN EMPTY"

June 1994

Page 30

CIRCUIT BOARD TESTING

NME1250

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

August 1993

Page 31