Scotsman NM650 Owner’s Manual

INTRODUCTION

NM650

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

TABLE OF CONTENTS

Installation

For the Installer

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

Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Two units on one bin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

For the Plumber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

For the Electrician . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

The NM650 is a modular ice system that fits a
variety of Scotsman ice storage bins.

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

Final Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Component Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Electrical Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Maintenance and Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Service Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Removal and Replacement

Reservoir and Bin Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Bearing and Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Water Seal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Evaporator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Gearmotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Fan Motor Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Electronic Tester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

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

January, 1991

Page 1

Minimum

Circuit

Ampacity

20.7

16.8

11.4

10.2

WATER

INLET

NM650

FOR THE INSTALLER

BACK VIEW: AIR COOLED

WATER INLET

3/8" FLARE

DRAIN

3/4" FPT

Note: Allow 6"

behind and 6"

above either unit

for air circulation,

utility connections,

and service.

ELECTRICAL

INLET

9.5"

5.25"

3"

Condenser Inlet 3/8" FPT

2.1"

5.7"

Condenser Drain 1/2" FPT

BACK VIEW: WATER COOLED

2.9"

3.4"

DRAIN

3/4" FPT

4.9"

7.46"

ELECTRICAL

5.25"

3"

INLET

7.3"

9.43"

The NM650 is designed to fit the following
Scotsman storage bins:

B590 and extensions (with bin top KBT18)
BH800 using bin top KBT15 (one unit).
BH800 (two units, no bin top required).
BH1000 using bin top KBT16.

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

Correct Bin
Correct Ice Machine
Correct Bin Top (if required)
All kits, legs, and information required for
the specific job.

SPECIFICATIONS: ICE MAKER

Model Number

NM650AE-1A

NM650WE-1A

NM650AE-32A

NM650WE-32A

Diminsions

(w/o bin)

H X W X D

27" x 21" x 24"

same
same
same

Basic

Electrical

115/60/1

same

208-230/60/1

same

Installation Limitations:

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

Min Max
Air Temperature 50
Water Temperature 40

0

F 1000F

0

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

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

limitations is misuse and can void the warranty.
The normal finish for the ice machine is

enamel-sandalwood. A stainless steel panel
kit, SPKFM21 may be field installed to convert
the unit to a stainless steel finish.

Ice Type

NUGGET

same
same
same

Condenser

Type

Air

Water

Air

Water

Max

Fuse

Size

35
30
20
20

Comp.

H.P.

3/4
3/4
3/4
3/4

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

January, 1991

Page 2

FOR THE INSTALLER

NM650

Water Limitations:

An ice machine is a food manufacturing plant:
it takes a raw material, water, and transforms
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
related questions, but it does offer these
general recommendations:

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

2. In most cases, the water used to make ice
should be filtered or treated, depending upon
the water.

that is effective in all situations.

water test is important.

There is no one type of water filter

That is why a

Note:

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.

Typical Storage Bin - B590

1.25"

21.12"

Drain

3/4"
FPT

January, 1991

Page 3

NM650

FOR THE INSTALLER

Typical Storage Bin with Extension and Bin Top

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 at the
back 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 environmental limitations.

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.

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.

Install the appropriate bin top on the bin,
according to the instructions for the bin top.

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

Remove the front panel and remove any
shipping blocks.

January, 1991

Page 4

Ice Maker:

FOR THE INSTALLER: Location

TWO UNITS ON ONE BIN

ALLOW ROOM

FOR AIR
CIRCULATION
AND SERVICE

ACCESS

NM650

DO NOT STACK ANYTHING IN

FRONT OF THE MACHINE(S)

January, 1991

Page 5

NM650

FOR THE PLUMBER

CONFORM TO ALL APPLICABLE CODES

Water Inlet

Air Cooled Models: The recommended water

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

Water Treatment: In most areas, a water filter
of some type will be useful. In areas where the
water is highly concentrated with minerals the
water should be tested by a water treatment
specialist, and the recommendations of the
specialist regarding filtration and/or treatment
should be followed.

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

WATER

COOLED

CONDENSER

INLET

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.
Use only 3/4" rigid tubing.

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.

AIR COOLED

MODELS

FIELD

HAND

VALVE

SUPPLIED

FILTER

HAND

VALVE

WATER

FILTER

CONDENSER

DRAIN

VENTED

DRAIN

WATER

INLET

VENTED

DRAIN

January, 1991

Page 6

FOR THE ELECTRICIAN

CONFORM TO ALL APPLICABLE CODES

NM650

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.

WATER COOLED

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

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

POWER

SUPPLY

AIR COOLED

January, 1991

Page 7

NM650

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
back 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 clearance over the top of the
machine for service access?

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

10. Have all of the shipping blocks been
removed?

January, 1991

Page 8

START UP

NM650

Pre-Start Inspection

1. Remove the front and side service panels.

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

Start Up

1. Go through the prestart inspection.

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

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

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

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

will start.

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

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

4. Check that the unit is installed correctly
according to the final check list (page 8).

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

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

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

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

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

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

5. The unit should soon be making ice, if
desired, the low side pressure can be
checked: it should be 30 psig + or - 4 psig.

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

January, 1991

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

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

Page 9

NM650

COMPONENT DESCRIPTION

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

High Pressure Cut Out Switch: A manual
reset switch sensing the high side refrigeration
pressure. It is set to shut the machine off if the
discharge pressure should ever exceed 400
psig. On older models (up to late 1990
production) the reset switch light would also
come on.

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

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

Water Level Sensor: Senses if there is water
in the reservoir to make ice out of. Will shut
the machine off it there is no water.

AIR COOLED

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

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

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

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

Expansion valve: The refrigerant metering
device.

WATER COOLED

ICE CHUTE

CONTROL BOX

CONDENSER

EXPANSION

VALVE

RESERVOIR

DRAIN

TUBE

CONTROL BOX

CONDENSER

EXPANSION

VALVE

RESERVOIR

ICE CHUTE

COMPRESSOR

ICE LEVEL

SENSORS

January, 1991

Page 10

HIGH

PRESSURE

CUT OUT

ICE LEVEL

SENSORS