Scotsman NSE650 Manuel utilisateur

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 NSE650 is a complete ice system that

produces and stores nugget ice.

It features: front service for the condenser, control

box, and water reservoir; an electronic circuit for

monitoring ice and water level; a thermostatic

expansion valve; and HP62 as the refrigerant.

Table of Contents

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

FOR THE PLUMBER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

FOR THE ELECTRICIAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

FOR THE INSTALLER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

START UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

COMPONENT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

ELECTRICAL SEQUENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

OPERATION: Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

OPERATION: Refrigeration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

TECHNICAL CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

MAINTENANCE AND CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

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

REMOVAL AND REPLACEMENT: Water Reservoir & Bin Controls . . . . . . . . . . . . . . . . . . . . 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

REFRIGERATION SERVICE: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

CIRCUIT BOARD TESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

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

This manual was printed on recycled paper.

Keep it for future reference.

Note these symbols when they appear.

They mark a section that concerns potential hazards.

NSE650

August 1993

Page 1

FOR THE INSTALLER

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 104 126

(Compared to the nameplate)

Operating the machine outside of the

limitations is misuse and can void the warranty.

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.

Max.

Fuse

Size

Refrigerant

Charge

(R-404a)

Model Number

NSE650AE-1A

NSE650WE-1A

Dimensions

(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

25 ounces

20 ounces

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.

SPECIFICATIONS: ICE MAKER

NSE650

June 1994

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 its selected location.

Level the unit, using the adjustable leg levelers:

both in the front to back and left to right directions.

Unscrew its 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.

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

design are subject to change without notice.

NSE650

August 1993

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 80 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

NSE650

June 1994

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

NSE650

August 1993

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 side of 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?

NSE650

June 1994

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 6).

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

34 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 220 psig and 300 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.

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 Customer Evaluation & Warranty

Registration Form, and mail it to Scotsman.

NSE650

August 1993

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

NSE650

June 1994

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.

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.

ON/OFF SWITCH

LOW PRESSURE

CUT OUT SWITCH

POTENTIAL

RELAY

CONTACTOR

CIRCUIT

BOARD

TRANSFORMER

START

CAPACITOR

"Bin Empty"

Light, glows

when ice level in

storage bin is

not full.

"No Water" Light, glows

when water level in

reservoir is too low.

NSE650

August 1993

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 split phase 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

NSE650

June 1994

Page 10

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