Scotsman NME1250R Installation Manual

INTRODUCTION

NME1250R

To the owner or user: The service manual you are
reading is intended to provide you, and the
maintenance or service technician, with the
information needed to install, start up, clean,
maintain, and service this ice system.

The NME1250R is a remote condenser modular
ice system that features: front service for the
freezer, gearmotor, control box, water reservoir,
and bin control; an electronic circuit for monitoring
ice and water level; a thermostatic expansion
valve; and HP62 as the refrigerant.

Table of Contents

FOR THE INSTALLER: Remote Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

FOR THE PLUMBER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

FOR THE ELECTRICIAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

FOR THE INSTALLER: Completed Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

FOR THE INSTALLER: Final Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

START UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

COMPONENT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

ELECTRICAL SEQUENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

MAINTENANCE AND CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

ICEMAKER MAINTENANCE: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

SERVICE DIAGNOSIS: Condition - No Ice Being Produced . . . . . . . . . . . . . . . . . . . . . . . . 22

SERVICE DIAGNOSIS: Condition - Low Ice Production . . . . . . . . . . . . . . . . . . . . . . . . . . 26

REMOVAL AND REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

REMOVAL AND REPLACEMENT: Bearing And Breaker . . . . . . . . . . . . . . . . . . . . . . . . . 28

REMOVAL AND REPLACEMENT: Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

REMOVAL AND REPLACEMENT: Evaporator & Water Seal . . . . . . . . . . . . . . . . . . . . . . . 30

REMOVAL AND REPLACEMENT: Evaporator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

REMOVAL AND REPLACEMENT: Gearmotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

REFRIGERATION SERVICE: HP62 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

ELECTRONIC CONTROL TESTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

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

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

August 1993

Page 1

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FOR THE INSTALLER: Remote Condenser

19 7⁄8"

ERC DIMENSIONS

Model A B F G
ERC201

33 3⁄8" 10 3⁄4" 16 3⁄4" 11 5⁄8"

ERC402

43 3⁄8" 10 3⁄4" 21 3⁄4" 16 5⁄8"

Installation Limi tations:

This ice system is desig ned to be ins talled indo ors,
in a controlled env iron men t:

Min. Max.
Air Temperature 50
Water Temperature 40
Water Pressure 20 psi 80 psi
Voltage 5% +10%

(Compared to the nameplate)
The temperature limita tio ns do not apply to the

remote condenser. It will work betwe en -20
degrees F, and 120 degrees F.

0

F1000F

0

F1000F

Operating the mach ine outside of the limitations is
misuse and can void the warran ty.

Scotsman Ice Syste ms are desig ne d an d
manufact ure d with the highest regard for saf et y
and performan ce. They meet or exc ee d the
standard s of UL, NSF, and CSA.

Scotsman assumes no liabilit y or resp on sib ility of
any kind for products manufactured by Scotsman
that have been alt ere d in any way, includin g th e
use of any part and/or other components not
specifically approved by Scotsman.

Scotsman reserves the right to make design
changes and/or improvements at any time.

NME1250R

SPECIFICATIONS: REMOTE CONDENSER

Model Use with Basic Electrical
RCE651-32 1 NME1250R 208-230/6 0/1
ERC201-32 SAME 208-230/6 0/1
RCE652-32 1 or 2 NME1250Rs* 208-230/60/ 1
ERC402-32 SAME 208-230/6 0/1

23 13⁄16"

RTE25 Precharged line set, 25’. R-404A
RTE40 Precharged line set, 40’. R-404A
* Two units on one condenser requires a fan relay kit.

Icemaker Nameplate Located On Back Panel

Serial Plate Located Behind Front Panel

December 1995

Page 3

LEVEL THE ASSEMBLY

NME1250R

FOR THE INSTALLER

Location:

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

Storage Bin:

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

Install bin top if required, follow the
directions included with the bin top.

Note: Do not push bin into position, but lift it
there. Pushing a bin, especially one with ice
in it, can cause damage to the legs and the
leg mounts.

GASKET

Ice Maker:

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

Remove the front panel and remove the
styrofoam shipping blocks from under the
gearmotor, the top of the ice chute, and
from between the gearmotor and the right
side panel.

FASTEN THE MACHINE

TO THE BIN WITH THE

HARDWARE SUPPLIED

WITH THE ICEMAKER

June 1994

Page 4

FOR THE INSTALLER: Remote Condenser Installation

LOCATE REMOTE

CONDENSER

ABOVE ICEMAKER

NME1250R

Location:

Limited to a 40 foot or a 25 foot length of
precharged refrigerant tubing connecting the
icemaker to the remote condenser. The
condenser must be above or level with the
icemaker.

Select the best available location, protecting the
condenser from extremes of dirt, dust, and sun.

Meet all applicable building codes. Usually the
services of a licensed electrician are required.

Roof Attachment:

1. Install and attach the remote condenser to the
roof of the building, using the methods and
practices of construction that conform to the local
building codes, including having a roofing
contractor secure the condenser to the roof.

2. Have an electrician connect the remote
condenser fan motor to the icemaker, using the
junction box at the back of the icemaker.

PRECHARGED LINE ROUTING

///////////////////////////////CAUTION////////////////////////////////
Do not connect precharged tubing until all routing

and forming of the tubing is complete. See the
coupling instructions, next page for connecting
instructions.

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

1. Each set of precharged refrigerant lines (either
25 foot or 40 foot) consists of a 3/8 inch diameter
liquid line and a 1/2 inch diameter discharge line.
Both ends of each line have quick connect
couplings, one end has a schrader valve
connection, that end goes to the condenser.

Note: The openings in the building ceiling or wall,
listed in the next step, are the minimum sizes
recommended for passing the refrigerant lines
through.

2. Have the roofing contractor cut a minimum hole
for the refrigerant lines of 1 3/4 inch. Check local
codes, a separate hole may be required for the
electrical power to the condenser.

////////////////////////////////CAUTION////////////////////////////////
DO NOT KINK OR CRIMP REFRIGERANT

TUBING WHEN INSTALLING IT.
/////////////////////////////////////////////////////////////////////////////

3. Route the refrigerant lines through the roof
opening.

Follow straight line routing whenever possible.

Any excess tubing MUST be retained within the
building.

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

Note: spiral need not be as tight as illustrated.

5. Have the roofing contractor seal the holes in
the roof per local codes.

REMOTE CONDENSER

SPIRAL

EXCESS

TUBING

INSIDE

BUILDING

August 1993

Page 5

SERVICE PORTS

REMOTE

CONDENSER

NME1250R

FOR THE INSTALLER

COUPLING INSTRUCTIONS

////////////////////////////////CAUTION//////////////////////////////////
The couplings on the sets of precharged lines are

self sealing when installed properly. Carefully
follow the instructions:

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

1. Remove the protector caps and plugs. Wipe the
seats and threaded surfaces with a clean cloth to
be certain that no foreign matter remains on them.

2. Lubricate the inside of the couplings, especially
the O-Rings with refrigerant oil.

3. Connect the couplings to the fittings:

••The 3/8 inch liquid line (schrader valve end) to

the remote condenser fitting marked "liquid line".

••Connect the other end of the liquid line to the

icemaker fitting marked "liquid line."

••Connect the 1/2 inch discharge line (schrader

valve end) to the remote condenser fitting
marked "discharge line".

••Connect the other end of the liquid line to the

icemaker fitting marked "liquid line".

4. Begin tightening the couplings together by
hand, then using two wrenches (it is important that
ONLY the nut on the precharged lines be turned,
the other parts of the couplings must NOT be
allowed to turn or the process will tear out the
diaphragms and they will be loose in the
refrigeration system) tighten the coupling until it
bottoms out or a definite increase in resistance is
felt.

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

6. After all connections are made, and after the
king valve has been opened, check the couplings
for leaks.

Note: The system charge is contained in the
machine’s receiver. Holding charges of the same
refrigerant are present in the remote condenser
and pre-charged line sets.

SCHRADER VALVE

TO REMOTE

CONDENSER

NO SHRADER

VALVE

TO ICEMAKER

3/8" LIQUID LINE

1/2" DISCHARGE LINE

June 1994

Page 6

FOR THE PLUMBER

ICEMAKER DRAIN

3/4" FPT

CONFORM TO ALL APPLICABLE CODES

NME1250R

Water Inlet

The recommended water supply is cold water.
Use 3/8" O.D. copper tubing, connect to the 3/8"
male flare at the back of the cabinet. Install a hand
valve near the machine to control the water supply.

WATER

INLET

3/8" FLARE

HAND

SHUT OFF

VALVE

Drains

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

Storage Bin: A separate gravity type drain needs
to be run. Insulation of this drain line is
recommended.

CONNECT TO

COLD WATER

FIELD INSTALLED

BIN DRAIN

3/4" FPT

FILTER

(OPTIONAL)

August 1993

Page 7

NME1250R

FOR THE ELECTRICIAN

CONFORM TO ALL APPLICABLE CODES

The electrical power to the unit is supplied
through the junction box at the rear of the
machine.

Check the nameplate (located on the
back panel) for the voltage requirements,
and for the minimum circuit ampacity.
The machine requires a solid chassis to
earth ground wire.

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

Electrically the remote condenser fan
motor is connected to the icemaker at the
contactor terminals for the compressor
and the fan motor operates whenever the
compressor operates.

Electrical connections are made at the
junction box at the back of the icemaker
and at the junction box on the remote
condenser.

The remote condenser must be wired to
the icemaker in accordance with local and
national electrical codes with a minimum
of 18 Awg. wire with an ground bonding
wire connected to the ground screws
provided in both the condenser and
machine field wiring boxes. All outdoor
wiring must be in rainproof conduit.

All external wiring must conform to
national, state, and local electrical
codes. The use of a licensed
electrician is required to perform the
electrical installation.

REMOTE CONDENSER

WATERPROOF
(LIQUID TIGHT)

CONDUIT

ICEMAKER

JUNCTION BOX

POWER
SUPPLY

June 1994

Page 8

FOR THE INSTALLER: Completed Installation

A typical installation should generally appear as
illustrated below. The remote condenser must be
located above the icemaker and the precharged
lines installed per the instructions on page 6.

NME1250R

ROOF

CUT-AWAY

INSULATED PRECHARGED

REFRIGERANT TUBING

August 1993

Page 9

LEVELED?

NME1250R

FOR THE INSTALLER: Final Check List

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

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

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

4. Has the machine and bin been
leveled?

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

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

7. Has the machine been secured to
the bin?

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

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

10. Has all shipping material (under
and next to the gearmotor, and on top
of the ice chute) and literature (inside
the front panel) been removed from
the units?

11. Have the remote condenser and
precharged lines been properly
installed?

12. Has the electrical connection
between the icemaker and the
condenser been made?

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

14. Switch on the electrical power.

15. Refer to Pre-Start instructions, the
next page.

POWER SUPPLY?

PLUMBING?

DRAINS?

June 1994

Page 10

START UP

Pre-Start Inspection

1. Remove the front, left , an d righ t side service
panels.

2. Chec k tha t the styrofoa m sh ipp ing bloc ks un de r
the gearmotor, on top of the ice discharge chut e,
and between the gearmotor and the right side
panel have been removed.

3. Inspect the interio r of the mach ine for loos e
screws or wires. Check that no refrige rant lines
are rubbing ea ch oth er. Che ck th at the fan blad e
turns freely (remot e conden ser).

Start Up

NME1250R

4. Check that the refrige ran t line s are properly
installed .

5. Check that the electrica l powe r has been on for
at least 4 hours.

6. Check that the unit is insta lled correctly
according to the fin al check list on page 10.

1. Go through the pre-start inspection.

2. Open the ha nd v alve , ob serve that water enter s
the water reservoir, fills the tube from the reservoir
to the evaporator, and then shuts off. Check for
leaks.

3. Ope n the Kin g Valve.

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

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

before the gearmotor sta rts.
B. After the gearmotor sta rts, the liquid line va lve

will open, the pump down control will close and the
compressor will start .

5. The remote condenser fan turns, and the
condenser begin s to discha rge warm air.

The low side pressure may be 25 to 28 PSIG in
low condensing temperatures, and 35 to 40 PSIG
when in high co nden sing tempera tu re s.

The discharge pressure will depend upon air and
water temperatures, but should be between 180 ­200 psig when in low con dens ing temperat ure s;
and 320 to 420 psig when in high condensing
temperatures.

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

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

9 Give the owner/use r the serv ice man ua l, ins truc t
him/her in the operatio n of the unit , and mak e sure
they know who to call for service.

10. Fill out the Customer Evalu ation and War ranty
Registration form, and mail it to Scotsman.

6. The unit should so on be making ice , if de sired
the low side pressure can be checked, it should be
30 psig + or - 4 psig.

April 1995

Page 11

RESET SWITCH

GEAR MOTOR

EVAPORATOR

ICE LEVEL SENSORS

NME1250R

COMPONENT DESCRIPTION

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

High Pressure Cut Out (control): A manual
reset switch sensing the high side refrigeration
pressure. It is set to shut the machine off at 450
psig.

Evaporator: A vertical stainless steel tube,
refrigerated, and water filled. In it there is a
stainless steel auger.

Reservoir: Float operated, it maintains the water
level in the evaporator at a constant level, it also
contains the water level sensor.

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

Ice Discharge Chute: Directs the ice produced
by the evaporator into the storage bin.

Ice Level Sensor: An electronic "eye", it senses
the presence of ice in the bottom of the ice
discharge chute. Operates to turn the ice machine
on and off automatically as the level of ice in the
bin changes.

Gear Motor: An oil filled, speed reduction
gearbox, driving the auger.

Cleaning Drain Tube: When uncapped and
lowered, drains the evaporator.

Compressor: The refrigerant vapor pump.
Expansion valve: The refrigerant metering

device.

RESERVOIR

WATER LEVEL SENSOR

(INSIDE RESERVOIR)

COMPRESSOR

HIGH PRESSURE

CUT OUT

ICE CHUTE

EXPANSION VALVE

CLEANING DRAIN

TUBE

June 1994

Page 12

COMPONENT DESCRIPTION: Control Box

TRANSFORMER

NME1250R

Contactor: A definite purpose contactor

connecting the compressor and the remote
condenser fan motor to the power supply.

Circuit Board: Controlling the ice machine
through sensors and relays. The sensors are: ice
level, and water level. The relays are for the gear
motor (with a built in time del ay to clear the
evaporator of ice when the unit turns off) and for
the liquid line valve.

POTENTIAL

RELAY

Transformer: Supplies low voltage to the circuit

board.
Pump Down Control: A switch to control the

compressor, depending upon low side pressure:
closes at 30 PSIG, and opens at 15 PSIG.

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

PUMP DOWN

CONTROL

SWITCH

OF/OFF

SWITCH

CIRCUIT

BOARD

CONTACTOR

June 1995

Page 13

NME1250R

ELECTRICAL SEQUENCE: A Model

Refer the wiring diagram as needed.

If the machine is switched off at the master switch,
but is otherwise ready to go, switching the master
switch to ON does the following:

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

••There is a 15 second delay

••If there is enough water in the reservoir, the

circuit board will allow the machine to start up.

Start up consists of:

••The liquid line relay and auger motor relay

become energized, connecting power to the
liquid line solenoid coil and the windings of the
auger motor.

••The liquid line solenoid opens, raising the low

side pressure.

••The pump down control closes

••The auger motor starts, and the centrifugal

switch closes, connecting power to the
compressor contactor coil.

••The contactor is energized, connecting power

to the compressor, and the compressor starts.

••As ice goes past the ice level sensors, the bin

empty light will be 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 machine shuts down.

Shut Down consists of:

••The liquid line solenoid relay opens, lowering

the suction pressure.

••The pump down pressure control 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.

••The pump down control switch will stop & start

the compressor.
The master switch is the manual control for the
complete machine, but it is not a service
disconnect.

June 1994

Page 14

OPERATION

WATER LEVEL

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.

RESERVOIR

EVAPORATOR

DRAIN

NME1250R

Water Level: The correct water level should be

checked when the machine is making ice. Locate
the water level in the reservoir, and compare it to
he horizontal line molded into the side of the
reservoir.

The correct level should be between

1

⁄4" below the line. If needed, bend the float arm up

or down to adjust the water level.

1

⁄8" above and

STRAINER

WATER

INLET

DRAIN

August 1993

Page 15

NME1250R

OPERATION:

Beginning at the compressor, the refrigerant is
compressed into a high temperature gas. The
discharge line directs this gas to the condenser
and to the head pressure control At the remote
condenser the gas is cooled by air and it then
condenses into a liquid. This high pressure liquid
then goes through the liquid line to the liquid line
connection at the head pressure control. If the
head pressure is high enough the liquid refrigerant
will go through the valve and enter the receiver.
From the receiver, the liquid refrigerant flows
through the liquid line valve and then 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. 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.

REMOTE CONDENSER

DISCHARGE

LINE

HEAD

PRESSURE

CONTROL

VALVE

LIQUID LINE

DETAIL OF HEAD

PRESSURE CONTROL

VALVE

LIQUID LINE

VALVE

THERMOSTATIC

EXPANSION

VALVE

EVAPORATOR

RECEIVER

COMPRESSOR

June 1994

Page 16

OPERATION: Refrigeration

THERMOSTATIC

EXPANSION

VALVE

LOW CONDENSING TEMPERATURE

NME1250R

The refrigeration system under low condenser air
temperatures is much the same as it is under
higher temperatures, with the exception that the
resulting low head pressures cause the head
pressure control to close off the liquid line between
the condenser and the receiver.

DISCHARGE

LINE

LIQUID LINE

This forces more refrigerant into the condenser
(with a small amount of discharge gas going into
the receiver to maintain pressure until the head
pressure is built back up to 180 psig). At that
pressure the valve opens up the liquid line from
the condenser to the receiver.

REMOTE CONDENSER

DETAIL OF HEAD

PRESSURE CONTROL

VALVE

HEAD

PRESSURE

CONTROL

VALVE

RECEIVER

LIQUID LINE

VALVE

EVAPORATOR

COMPRESSOR

August 1993

Page 17

NME1250R

OPERATION: Refrigeration

DISCHARGE

LINE

REMOTE CONDENSER

LIQUID LINE

LIQUID LINE VALVE

(CLOSED)

RECEIVER

PUMP DOWN

During the pump down cycle (usually initiated by
the circuit board de-energizing the liquid line valve)
the discharge gases flow through their normal path
to the remote condenser, through the head
pressure control, and into the receiver. At this
point the refrigerant flow is stopped by the closed
liquid line valve.

June 1994

COMPRESSOR

This action forces the refrigerant into the receiver
and keeps it out of the compressor. The pump
down continues until the pump down control opens
turning the compressor off.

Page 18

NME1250R

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.

9. As the ice maker begins to use water from the

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 solution should be
between 90 and 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.

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

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 substitute an approved

sanitizing solution for the cleaning solution. A
possible sanitizing solution may be made by
mixing 1 ounce of household bleach with 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.

0

F. - 1150F.) water.

August 1993

Page 19

SLIDE IN AND

OUT

ICE

SWEEP

NME1250R

ICEMAKER 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 DISCHARGE

CHUTE

ICE LEVEL

SENSORS

••unscrewing the auger stud

Inspect the assembly, looking for wear .

4. Clean the remote condenser. Use a vacuum
cleaner or coil cleaner if needed.

Do NOT use a wire brush.

5. Check and tighten all bolts and screws.

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

CAUTION: SENSOR TIP

IS MADE OF GLASS

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

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

Check the thrust bearing by:

••removing the ice chute cover

••unscrewing the ice sweep

••removing the water shed

••unscrewing the breaker cover

BREAKER

COVER

BREAKER

June 1994

Page 20

MAINTENANCE: Auger

Hazardous Moving
Parts.

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

In some areas the water supply to the icemaker
will have a great deal of minerals in it, and that will
result in an evaporator and auger becoming
coated with these minerals, requiring a more
frequent 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.

The auger has sharp edges,
handle with gloves.

ALLEN

SCREWS

NME1250R

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
panels.

2. Remove bail clip holding the ice chute cover to
the ice chute body, and remove the cover.

3. Unscrew and remove ice sweep.

4. Remove ice chute body from evaporator.

5. Remove 4 allen 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.

8. Reverse to reassemble.
Remote Condenser:
Clean the fins of the remote condenser. Use a soft

brush or vacuum. Use coil cleaner if grease is
embeded in the fins.

BREAKER &
BEARING &

AUGER

ASSEMBLY

August 1993

Page 21

NME1250R

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 switch ( high pressure): depress and release the switch. If the unit still does

not start, check the high side pressure.

D. Check the high pressure cut out switch.

1. This pressure switch opens at 450 psig. Check the high side pressure, reset the switch and observe that
the fan is forcing air through the condenser. If the switch opens at pressures below 450 psig, replace the
switch. If the pressures rise above the trip out point, and the unit shuts down:

a. Check for adequate air flow. Clean the condenser. If the air flow is poor because of the
installation, advise the user that the unit should be moved, or the air around it kept cooler.

Check the fan motor for tight bearings and proper rotation.

Check that the fan blades are clean, and the fan secure to the fan motor shaft.
b. Check the head pressure control valve, it should be maintaining a head pressure
above 180 psig. If the unit has the correct charge, and the condenser is clean, and the
refrigerant lines are not kinked or twisted, and the condenser is not overheated by
external heat loads, the head pressure should be under the trip out point of the head
pressure control switch. If all of the above are found to be good, and the machine
trips out on high head pressure, replace the head pressure control valve.

G. Check the water level. If there is not enough water in the reservoir, the water level sensor will
keep the machine from starting.

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

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

June 1994

Page 22

NME1250R

SERVICE DIAGNOSIS: Condition - No Ice Being Produced

STATUS:

NOTHING OPERATES

F. Check: The gear motor, if it will not run, the compressor will not run. If no power to it: Check:
the indicator lights on the circuit board, the bin empty light should be ON, the no water light
should be OFF .

1. If 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 (see page end of manual).

a. Move the "bin full" switch on the tester to the full position. The bin full
light on the tester should be ON, if not, replace the circuit board.
If the bin full light on the tester is ON, move the tester switch to "bin empty"
the light on the tester should go OFF and the bin empty light on the circuit
board should go ON. If not, replace the circuit board. If it does as above,
and the machine still does not run, replace the ice level sensors.

3. If the transformer is fine, and the "no water" light is ON, check the water level sensor.
a. Check the water level in the reservoir, restore if low. If the water level is ok:
b. Remove the water level sensor from the reservoir and clean the tip if dirty.
////////////////////////////////////////////////////////////////////
CAUTION: THE TIP IS MADE OF GLASS
///////////////////////////////////////////////////////////////////
c. Replace the water level sensor. If the no water light is still on, check that the
"water sen" plug is firmly plugged into the circuit board.
d. If the no water light is still on,

1. Unplug the "water sen" connector from the circuit board.

2. Plug "water sen" connector from the control tester into the circuit board.
a. Move the water switch on the tester to "no water" and the no water light
on the circuit board should go on. If not, replace the board..
b. Move the water switch to the" water" position, the no water light should
go off, if not, replace the circuit board.
c. If after the above, the machine still will not run, replace the
water level sensor

August 1993

Page 23

NME1250R

SERVICE DIAGNOSIS: Condition - No Ice Being Produced

STATUS:

GEARMOTOR OPERATES, COMPRESSOR DOES NOT

A. Check the pump down control switch.

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

running the machine the switch opens at a pressure higher than 18 psig, replace the switch.

The pump down could remai n op en for any of the fol lowing reasons: Lo w ref r i ge ra nt charge, auger not

turning, restricted system, TXV not opening, liquid line valve not opening.

2. Check the low side pre ss u re , the pump down control shou ld remain closed at any pres s ur e hig her than

15 psig. If less than that:

a. Check if the auger is turning, if it is not, remove the gearbox and:

Check for internal damage, repair and replace in the machine.
b. Check for low charge, add some refrigerant, if the unit begins to operate, (normal low
side pressure being about 30-32 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 charg e.

Check for a Thermostatic Expansion Valve that does not open, if defective,

replace it. Replace the drier, evacuate, and weigh in the nameplate charge.

c. Check the liq ui d line solenoid valv e, it should hav e p ower to it, if not:

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

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

If there is power to the valve, the coil may be open, or the valve jammed, replace

the valve.

Note: The pump down control setting changed beginning with May 1995 production. CI was 17, CO was 2.

June 1995

Page 24

NME1250R

SERVICE DIAGNOSIS: Condition - No Ice Being Produced

STATUS:

GEARMOTOR OPERATES, COMPRESSOR DOES NOT

B. Check the compressor relay.

The relay is on the circuit board, if it does not supply power to the liquid line valve coil, the low pressure

control will not close, and the compressor will not run.

1. Check for power at the liquid line valve 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 coil,

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

2. Check the coil. If the coil is open, replace the liquid line valve.

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.

C. Check the compressor contactor.

1. If the liquid line valve is open, and the gearmotor is running, the low pressure control should be closed,

and the compressor contactor should be energized. If not:

a. Check for power at the gearmotor terminal to the contactor, if none:

Replace the drive motor or the centrifugal switch in the drive motor.
b. Check for power at the high pressure control, if none, check that control.
c. Check the coil of the contactor, if open, replace the contactor.

D. Check the compressor

1. Check for power at the compressor: check the start relay, and start capacitor.

2. Check the windings of the compressor for open windings or shorts to ground.
Replace those items found defective.

August 1993

Page 25

NME1250R

SERVICE DIAGNOSIS: Condition - Low Ice Production

I. STATUS:

EVERYTHING IS OPERATING

A. Check the condenser for dirt. Clean as required. Check the head pressure. If the head
pressure is very high:

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

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

3. Check the interconnecting refrigerant tubing for kinks or twists. Check that
the discharge and liquid lines are insulated, and do not touch each other
where not insulated.

B. Check the evaporator

1. Clean the evaporator, the mineral build up will adversely affect the ice machines production.

2. Check the evaporator for water leaks, replace the water seal if found to be leaking.

3. Check the low side pressure; normal is about 30-32 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 form 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.

D. Refrigerant charge

On this model the refrigerant charge is adequate whenever the receiver has enough liquid refrigerant to
maintain liquid refrigerant at the TXV. HOWEVER, the condensing temperature will have a definite bearing
on this. A unit with a marginal charge in summer, will be undercharged when the outside air temperature
drops. The only correct way to charge this unit is to weigh in the nameplate charge.

June 1994

Page 26

REMOVAL AND REPLACEMENT

LOCKING TAB

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 push locking tab in and pull float

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

available separately.

5. To remove reservoir, remove drain hose from

reservoir.

6. Remove evaporator inlet hose from reservoir.

7. Pull water sensor from reservoir.

8. Remove mounting screws from reservoir

bracket, and remove reservoir from icemaker.

9. Reverse to reassemble.

NME1250R

FLOAT VALVE

PLUNGER

ICE DISCHARGE CHUTE

SLIDE THE

SENSOR

HOLDERS LEFT

TO REMOVE

FROM THE 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.

August 1993

Page 27

BEARING

NME1250R

REMOVAL AND REPLACEMENT: Bearing And Breaker

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

Hazardous Moving
Parts.

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

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

To Remove the Breaker Bearing Assembly:

1. Remove panels and disconnect electrical power.

2. Move bail clip off of ice chute cover and remove

ice chute cover.

3. Unscrew and remove ice sweep.

4. Remove insulation halves from outside of 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.

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 & Step 6

ICE SWEEP

BREAKER

AUGER

STUD

BREAKER

COVER

SEALS

June 1994

Page 28

REMOVAL AND REPLACEMENT: Auger

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

d. Use a slide hammer type puller to pull on the

Hazardous Moving
Parts.

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

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. 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.

auger at the threaded hole. The size of that hole
is 5/8"-18.

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

a. The auger body. It should be clean and
shining. Sometimes an auger will appear clean
when wet, but after it is dry it will be seen to be
stained. Scrub the auger with ice machine cleaner
and hot water.

Ice machine cleaner is an acid. Handle it with
extreme care, keep out of the reach of children.

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

NME1250R

BREAKER

ASSEMBLY

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.

ALLEN

SCREWS

SLIDE

HAMMER

PULLER

August 1993

Page 29

PLACE FOOD

GRADE SILASTIC

HERE

NME1250R

REMOVAL AND REPLACEMENT: Evaporator & Water Seal

To Remove the Water Seal:

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

1. The gearmotor/evaporator assembly will have to

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

2. Remove the 4 hex head cap screws holding the

evaporator to the gearmotor assembly. Lift the
evaporator up and off of the gearmotor.

3. Remove the snap ring or wire retainer from the

grove under the water seal.

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

To Replace the Water Seal:

1. Lubricate the water seal with water, and push

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

2. Replace the snap ring and pull the water seal

down against it.

3. The part of the water seal that rotates with the

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

4. Place a small bead of food grade silastic sealant

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

5. Carefully push the water seal (rubber side

against the auger shoulder and the silastic.)
////////////////////////////////CAUTION//////////////////////////////
Do not get any silastic onto the face of the seal.
//////////////////////////////////////////////////////////////////////////////

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

silastic is dry on the surface.

7. If the original water seal was leaking, it would be

a good idea to inspect the interior of the gearmotor.

REPLACING THE WATER SEAL

WATER SEAL

RETAINING RING

June 1994

Page 30

REMOVAL AND REPLACEMENT: Evaporator

CHARGING

CYLINDER

NME1250R

To Replace the Evaporator:

(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")
resweat the tubing connections.

6. Install an new drier in the liquid line.

7. Evacuate the system until dehydrated, then

weigh in the nameplate charge. Check for leaks.

8. Install auger, breaker, breaker bearing

assembly, and ice discharge chute in reverse
order of disassembly. See "To Reassemble
Evaporator and Auger"

To Reassemble the Evaporator and Auger

1. After the gearmotor has been inspected, fasten
the evaporator to the gear motor, be sure that the
number of shims indicated on the gear case cover
is in place between the gearcase cover and the
drip pan gasket. Torque the bolts to 110 inch
pounds.

2. Lower the auger into the evaporator barrel,
slightly turning it to match up with the drive end.
Do Not Drop Into the Evaporator.

3. Complete the reassembly by reversing the
disassembly for the breaker & thrust bearing
assembly.

Head Pressure Control Valve

1. Recover system of refrigerant.

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

3. Unsweat old valve from tubing.

4. Unsweat old dryer from tubing.

5. Install new valve in place. Check for correct
connections and be sure that the number on the
side of the valve is "220"

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

7. Sweat in the new valve and the new dryer.

8. Evacuate the system, and weigh the nameplate
charge into the receiver..

CHARGING PROCEDURES

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

RECEIVER

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

KING VALVE

SERVICE PORT

August 1993

Page 31

NME1250R

REMOVAL AND REPLACEMENT: Gearmotor

having a creamy white appearance; oil level too

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.

WATER

To Inspect the gearmotor.

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

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

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

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

If there is evidence of water in the oil
(rusty bearings and gears; the oil

SHED

COVER

high) carefully inspect the bearings and gears. If
in doubt about the condition of a part, replace it.
The oil quantity is 14 fluid ounces, do not overfill.

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

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

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

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

MOTOR

BEARING

SEAL

June 1994

Page 32

FIRST GEAR

SECOND GEAR

GASKET

GEARCASE

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

NME1250R

August 1993

Page 33

Access Valves

Note: There are no valve

cores in this valve.

NME1250R

REFRIGERATION SERVICE

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.

June 1994

Page 34

NME1250R

ELECTRONIC CONTROL TESTER

Electrical shock hazard.

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

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.)
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 machine still does not run, replace the ice
level sensors.

LIGHT GOES ON

SWITCH TO

"FULL"

PHOTO TRANS

LED

LIGHT

GOES OFF

LIGHT

GOES ON

SWITCH TO

"BIN EMPTY"

August 1993

Page 35

NME1250R

ELECTRONIC CONTROL TESTER

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.

LIGHT OFF

SWITCH TO

"NO WATER"

SWITCH TO

"WATER"

June 1994

Page 36