Scotsman NS650 Manual de usuario

INTRODUCTION

To the owner or user: The service manual you

are reading is intended to provide you, and the

maintenance or service technician, with the

information needed to install, start up, clean,

maintain, and service this ice system.

The NS650 is a complete ice system that

produces and stores nugget ice.

It features: front service for the condenser,

control box, and water reservoir; a slide out

chassis; an electronic circuit for monitoring ice

and water level; a thermostatic expansion

valve; and R-502 as the refrigerant.

TABLE OF CONTENTS

Installation

For the Installer

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

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

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

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

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

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

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

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

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

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

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

Removal and Replacement

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

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

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

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

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

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

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

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

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

NS650

December, 1988

Page 1

FOR THE INSTALLER

When installing a new system, check to be

sure that you have everything you need

before beginning:

Correct Ice Machine (air or water cooled)

All kits, legs, and information required for

the specific job.

Installation Limitations:

This ice system is designed to be installed

indoors, in a controlled environment:

Min Max

Air Temperature 500F 1000F

Water Temperature 400F 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.

Model Number

NS650AE-1A

NS650WE-1A

Diminsions

(w/o legs)

H x W x D

37.5" x 38.06" x 29.5"

same

Basic

Electrical

115/60/1

same

Ice Type

NUGGET

same

Condenser

Type

Air

Water

Minimum

Circuit

Ampacity

Comp.

H.P.

3/4

Max

Fuse

Size

The normal finish for the ice machine is

enamel-sandalwood. A stainless steel panel

kit, SPKNS650 may be field installed to

convert the unit to a stainless steel finish.

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

ELECTRICAL

INLET

9.97"

5.77"

32.08"

WATER INLET

3/8" FLARE

BIN DRAIN

3/4" FPT

BACK VIEW

11.97"

33.14"

Note: Allow 6"

behind and 6" to

the left of the unit

for air circulation,

utility connections,

and service.

15"

RES DRAIN

3/4" FPT

Condenser Inlet

3/8 FPT

(Water Cooled)

Condenser Drain

1/2 FPT

(Water Cooled)

3.62"

9.27"

38.06"

1.77"

SPECIFICATIONS: ICE MAKER

NS650

December, 1988

Page 2

Location

After uncrating the machine, and inspecting it

for freight damage, the unit is ready for

installation.

It is important that the machine be installed in

a location where it has enough space for

service access. The unit will require removal

of the top panel for some service, so in under

counter applications, the unit will either have

to be pulled out, or the

countertop will have to

be removable.

Utility installation

needs some space at

the back of the cabinet,

the minimum is 6

inches.

On air cooled models,

the air flow must be

given consideration:

the unit takes in air

from the front, and

exhausts it through the

left and back panels.

These areas require at

least 6 inches of air

space to exhaust the

hot air.

Water Limitations

An ice machine is a food manufacturing plant;

it takes a raw material, water, and turns it into

a food product, ice. The purity of the water is

very important in obtaining pure ice and in

maximizing product life. This section is not

intended as a complete resource for water

questions, but it does offer these general

recommendations:

1. Filter the water used to produce ice. That is

the water going to the "potable" water

connection.

Water filters vary greatly in ability and

function. Install one that filters out suspended

solids to a dimension of 5 microns or smaller.

The finer the filter the better, but finer filters

will clog sooner than course ones. It may be

necessary to add a course filter ahead of the

fine filter to prolong filter life.

2. Check with a water treatment specialist for

a water test, and recommendations regarding

filters and treatment.

Legs

The legs (when used)

may now be installed.

Either use a

mechanical lift to

hoist the cabinet high

enough to screw in

the legs, or carefully

lay the unit on its

back (using portions

of the carton to

protect the back

panel) and screw the

legs in. Note: the legs

must be threaded in

all the way for

maximum strength.

When ready, do not

push the machine

into position, pushing may damage the floor,

and/or the legs mounts. Use a mechanical lift,

and set the unit in it’s selected location.

Level the unit, using the adjustable leg

levelers: both in the front to back and left to

right directions.

Unscrew it’s two screws and take off the front

panel. Remove any packing material

(styrofoam blocks or cardboard sheets) that

may be there.

FOR THE INSTALLER: Environmental Limitations

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.

NS650

December, 1988

Page 3

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.

Drains

Air Cooled Models: There are two

3/4" FPT drains at the back of the

cabinet. Drain lines are of the gravity

type, and 1/4 inch per foot fall is an

acceptable pitch for the drain tubing.

There should be a vent at the highest

point of each drain line, and the ideal

drain receptacle would be a trapped

and vented floor drain. Use only 3/4"

rigid tubing.

Water Cooled Models: In addition to

the above mentioned drains, a

separate condenser drain must be

installed. Connect it to the 1/2"

condenser drain connection at the

back of the cabinet.

HAND

VALVE

FIELD

SUPPLIED

FILTER

WATER

INLET

VENTED

DRAIN

CONDENSER

DRAIN

CONDENSER

INLET

WATER

COOLED

MODEL

VENTED

DRAIN

FLOOR DRAIN

NS650

December, 1988

Page 4

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.

All external wiring must conform to

national, state, and local electrical codes.

The use of a licensed electrician is

required to perform the electrical

installation.

JUNCTION

BOX

POWER

SUPPLY

NS650

December, 1988

Page 5

FOR THE INSTALLER Final Check List

1. Is the ice system installed indoors in a

location where the air and water temperatures

are controlled, and where they do not exceed

the design limitations?

2. Is there an electrical service disconnect

within sight of the installed machine? Has the

voltage been checked, and compared to

nameplate requirements?

3. Have all the plumbing connections been

made and checked for leaks?

4. Has the machine been leveled?

5. Is there a minimum of 6" clearance at the

back and left sideof the machine for proper

service access and air circulation? (air cooled)

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

7.Is the unit grounded?

8. Is there clearance over the top of the

machine for service access?

9. Is there a water shut off valve installed near

the machine?

10. Have all of the shipping blocks been

removed?

LEVELED?

WATER

SUPPLY?

DRAINS?

POWER

SUPPLY?

NS650

December, 1988

Page 6

START UP Pre-Start Inspection

1. Remove the front panels.

2. Check that the styrofoam shipping blocks

have been removed.

3. Inspect the interior of the machine for loose

screws or wires. Check that no refrigerant

lines are rubbing each other. Check that the

fan blade turns freely (air cooled).

4. Check that the unit is installed correctly

according to the final check list (page 7).

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.

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.

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.

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.

NS650

December, 1988

Page 7

COMPONENT DESCRIPTION

Control Box: Contains the electrical controls

that operate the machine.

High Pressure Cut Out Switch: A manual

reset switch sensing the high side refrigeration

pressure. It is set to shut the machine off, and

illuminate the reset switch light if the discharge

pressure should ever exceed 450 psig.

Compressor: The refrigerant vapor pump.

Reservoir: Float operated, it maintains the

water level in the evaporator at a constant

level, it also contains the water level sensor.

Water Level Sensor: Senses if there is water

in the reservoir to make ice out of. Will shut

the machine off it there is none.

Ice 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

CONTROL BOX

CONDENSER

EXPANSION

VALVE

RESERVOIR

AND WATER

LEVEL SENSOR

ICE CHUTE

COMPRESSOR

ICE LEVEL

SENSORS

GEARMOTOR

WATER

REGULATING

VALVE

ICE ACCESS

DOOR

ICE

STORAGE

BIN

HIGH

PRESSURE

CUT OUT

NS650

December, 1988

Page 8

COMPONENT DESCRIPTION: Control Box

Contactor: A definite purpose contactor

connecting the compressor and the remote

condenser fan motor to the power supply.

Circuit Board: Controlling the ice machine

through sensors and relays. The sensors are

for ice level and water level. The relays are for

the gear motor (with a built in time delay to

clear the evaporator of ice when the unit turns

off) and for the compressor. The reset switch

is mounted on the circuit board.

Transformer: Supplies low voltage to the

circuit board.

Low Pressure Cut Out Switch: A manual

reset control that shuts off the ice machine

when the low side pressure drops below a

preset point, 0-4 psig.

Potential Relay: The compressor start relay.

On/Off Switch: Manual control for the

machine.

Reset Switch: Part of Circuit Board, manual

reset. Lights up when unit shuts off from: ice

discharge chute being overfilled (opening the

microswitch at the top of the chute); low or

high pressure switches opening.

ON/OFF SWITCH

LOW PRESSURE

CUT OUT SWITCH POTENTIAL

RELAY

CONTACTOR

RESET SWITCH

CIRCUIT

BOARD

TRANSFORMER

START

CAPACITOR

NS650

December, 1988

Page 9

COMPONENT DESCRIPTION

Evaporator: A refrigerated vertical tube filled

with water and containing a water seal and

auger.

Auger: A solid stainless steel double spiral

auger, it pushes the ice crystals up to the top

of the evaporator.

Water Seal: A two part "face" seal, the top half

rotating with the auger, the bottom half

stationary, the sealing action being where the

two seal "faces" meet.

Ice Sweep: A plastic cap with "fingers". It

revolves with the auger to "sweep" the ice into

the ice chute.

Breaker: Where the ice is compressed and

much of the extra water is squeezed out of it

before it is discharged into the bin.

Motor: A permanent split capacitor motor that

drives the gear reducer.

Thrust Bearing: As the ice is pushed up the

evaporator, the auger is thrust down, and

pressure from the auger thrust is taken up by

this bearing.

WATER

SEAL

ICE SWEEP

BEARING

BREAKER

AUGER

EVAPORATOR

MOTOR

NS650

December, 1988

Page 10

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