Scotsman ND750 Installation Manual

INTRODUCTION

ND750

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 maker-dispenser.

The ND750 is a combination nugget ice maker and countertop dispenser. A water station is standard.

The ND750 ice making section is equipped with the following features: electronic controls for bin

level and low water; thermostatic expansion valve; front service for most components; and R502 refrigerant. The ice dispensing section is a seamless plastic storage bin, with a stainless steel ice agitator at the bottom to sweep the ice into the dispensing chute.

TABLE OF CONTENTS

For the Installer

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2

Location/Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 3

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

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

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

Inital Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 7

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

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

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 12

Maintenance and Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 15

Service Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 18

Removal and Replacement

Reservoir & Bin Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 23

Bearing and Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 24

Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 25

Water Seal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 26

Evaporator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 27

Gearmotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 28

Electronic Circuit Tester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 29

Wiring diagrams and parts lists are located in the middle of this manual, printed on yellow paper

January, 1989

Page 1

3/8" FPT

Cond.

Water Inlet

(W/C)

115/60/1

same

Basic

Electrical

ND750

FOR THE INSTALLER: Specifications

This ice maker-dispenser is designed to be mounted on a machine stand, or a countertop. Before beginning the installation, check that all the materials and kits required are available at the installation location.

Scotsman Ice Systems are designed and manufactured with the highest regard for safety and performance. They meet or exceed the standards of U.L., N.S.F., and C.S.A.

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 parts 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 designs are subject to change without notice.

Water Limitations:

An ice machine is a food manufacturing plant; it takes in a raw material, water, and turns it into a food product, ice. The purity of the water is very

BACK VIEW

important in obtaining pure ice and in maximizing product life.

General recommendations are:

1. Filter the water used to produce ice.

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

Electrical Junction

Box

3/8" Flare

Water Inlet

6.63"

12.5"

7.93"

Cond. Drain

.75"

1/2" FPT

(W/C)

3/4" FPT

Drain

3/4 FPT

Drain

4.63"

3.84"

2.63"

5.59"

17.59"

SPECIFCATIONS

Model

Number

ND750AE-1

ND750WE-1

Dimensions

(w/o stand)

H" x W" X D"

45.74" x 35.18" x 29.26" same

Ice

Type

Nugget

same

Condenser

Type

Air

Water

Bin

Capacity

110 lbs.

same

Minimum

Circuit

Ampacity+

19.8

18.4

+ Minimum Circuit Ampacity is used to determine wire size and type per National Electric Code.

Maximum

Fuse

Size

30 30

January, 1989

Page 2

FOR THE INSTALLER

ND750

Location

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

Minimum Maximum

Air Temp 50 Water Temp 40 Water Pressure 20 psi 80 psi Voltage 104 126 Operating the machine oustide of the above

limitations, or outdoors, is potentially damaging to the machine; also it is misuse of the machine which may void the warranty.

Service Limitations

Do not install in a location where the top of the machine is within 6" of a fixed ceiling. Air cooled models require a minimum of 6 inches to the left and right of the machine for air circulation. It is important that the machine be installed in a location where it has enough space above and behind it for service.

After uncrating and inspection, the unit is ready for installation.

Machine Stand Installation

Tip the stand on it’s back and install the legs, return the stand to the upright position. Adjust leg levelers so that the stand does not “rock”.

Counter Top or Machine Stand Installation

The base of the icemaker-dispenser must be sealed to the object it rests upon. Food grade silastic sealant such as Scotsman part number 19-0529-01 is recommended.

Place a bead of the sealant on the machine stand or counter top to match the outside edge of the cabinet base and sink.

The icemaker-dispenser is heavy: use of a mechanical hoist is recommended to lift it to the height required to install it.

The DMS machine stand has holes in the top that match up with threaded holes in the base of the machine. Secure the machine stand to the base with 4 5/16" bolts.

F. 1000F.

In both counter top and machine stand installations, wipe off and neatly smooth any excess sealant. Level the machine stand and cabinet.

Unpack and install the sink brackets. Fit the sink assembly onto the two sink brackets, and press onto the bead of sealant. Wipe off and neatly smooth any excess sealant from under the sink edge. Connect the sink drain to the dispenser drain system.

SEAL

ICEMAKER-

DISPENSER TO

THE COUNTER

TOP OR

MACHINE STAND

January, 1989

Page 3

ND750

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.

INLET WATER

Drains

Air Cooled Models: There is one 3/4" FPT drain

WATER COOLED

CONDENSER

WATER INLET

CONDENSER

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.

VENTED

DRAIN

OPTIONAL

WATER

FILTER

SHUT OFF VALVE

FLOOR DRAIN

January, 1989

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.

ND750

POWER SUPPLY

ELECTRICAL

CONNECTION

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Page 5

ND750

FOR THE INSTALLER: Final Check List

1. Is the icemaker-dispenser installed indoors, in a location where the air and water temperatures are controlled, and where they do not go beyond design limitations?

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

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

4. Has the machine been leveled?

5. Is there a minimum of 6 inches of clearance at the left and right sides of an air cooled machine?

ELECTRICAL?

LEVELED?

6. Is there a minimum of 6 inches of clearance at the top and back of the machine for service and utility connections?

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

8. Have all of the shipping blocks been removed?

WATER INLET?

DRAINS?

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Page 6

INITIAL START UP

Pre Start Inspection

1. Remove the two front panels.

2. Check that all shipping blocks have been removed.

3. Remove any and all packing tape (check inside the storage bin).

4. 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 on air cooled models turns freely.

5. Check that the machine is installed correctly according to the final check list.

Start Up

1. Go through the pre start inspection.

2. Open the water 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 will be a short (15 second) delay before the gearmotor starts.

B. After the gearmotor starts, the compressor will start.

4. On air cooled models, warm air will begin to flow from the condenser. Water cooled models will begin to discharge warm water down the drain.

5. The unit should soon be making ice. If desired, the low side pressure may be checked: it should be 30 PSIG + or - 4 PSIG.

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

Water cooled discharge pressure should be about 220 PSIG. If needed, adjust the water regulating valve.

The above numbers are for new, clean machines. Field values may be somewhat higher or lower.

6. There are no adjustments to make, so replace the panels.

ND750

turning a knob, the length of time the unit dispenses when the glass filler lever is pushed (and the amount of ice dispensed) is adjusted.

8. Switch off the icemaker-dispenser, remove the top panel and the top of the ice storage bin. Sanitize the interior of the ice storage bin by wiping it with a mixture of 1 ounce of household bleach to 1 gallon of water, allow to air dry. Replace all covers and panels. Switch the icemaker-dispenser back on.

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

10. Fill out the warranty registration card, and mail it in to Scotsman.

11. Fill out the field Quality Audit form, and mail it to Scotsman.

7. Check ice dispensing by pushing in on the glass filler lever. Ice dispenses are portion controlled; by

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Page 7

ND750

COMPONENT DESCRIPTION

RESERVOIR

WATER

LEVEL

SENSOR

EVAPORATOR

DRAIN

TUBE

ICE LEVEL SENSOR

ICE STORAGE BIN

GLASS FILLER

CONTROL BOX

PRESSURE

CUT OUT

PORTION

LOW

PRESSURE

CUT OUT

PORTION

CONTROL KNOB

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.

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 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

CONDENSER

on and off automatically as the level of ice in the bin changes.

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

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

Ice Storage Bin Assembly: A plastic lined, insulated cylinder that receives, stores and dispenses the ice. Fresh ice enters at the top, and when the bin is full enough the ice will be between the ice level sensors, and the icemaking will stop. Ice is dispensed through a chute at the bottom front when the agitator assembly sweeps the ice through the chute.

Glass Filler Lever: Pushing in on this lever causes the ice dispensing cycle to occur.

Portion Control Knob: Turning this knob adjusts the length of time of dispense.

January, 1989

Page 8

COMPONENT DESCRIPTION: Control Box

POTENTIAL RELAY

CONTACTOR

Contactor: A definite purpose contactor

connecting the compressor to the power supply. Circuit Board: Controlling the ice machine

through sensors and relays. The sensors are 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.

On/Off Switch: Manual control for the machine. Transformer: Supplies low voltage to the circuit

board. Potential Relay: The compressor

start relay. 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.

Portion Control Module: Controls the amount of time the dipensing drive motor is on. The time is varied by adjusting the portion control knob.

PORTION CONTROL

ND750

TRANSFORMER

CIRCUIT BOARD

RESET SWITCH

January, 1989

Page 9

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