Scotsman NME 1850, FME 2400 ice maker Service manual

NME1850 & FME2400

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.

This product contains 2 separate ice making systems in one cabinet.

TABLE OF CONTENTS

Installation

For the Installer

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

Storage Bin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

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

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

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

Gear motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

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

Refrigeration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Electronic Tester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

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 the Warning symbol where it appears, it marks a possible hazard.

January 1994

Page 1

NME1850 & FME2400

FOR THE INSTALLER

The FME2400 and the

NME1850 are designed to fit the following Scotsman storage bins:

B90 and extensions

(with bin top KBT18)

BH800 no bin top required.

BH900 using bin top KBT14.

BH1360, no bin top required.

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

Correct Bin

Correct Ice Machine

BACK VIEW

Condenser Inlet (W/C):

3/8" FPT

Correct Bin Top (if required)

All kits, legs, and information

TOP VIEW required for the specific job.

9.5"

5.25"

3"

Note: Allow 6" behind and

6" above the unit for air circulation, utility connections, and service.

The normal finish for the ice machine is enamel-sandalwood. A stainless steel panel kit,

Ice Chute

2.64" x 6.2"

14.9"

15.8"

18.74"

18.9"

Electrical Inlet

Water Inlet 3/8" Flare

Drain 3/4" FPT

Condenser Drain (W/C):

1/2" FPT

6"

34.84"

13.84"

18.28"

SPECIFICATIONS : ICE MAKER

Model Dimensions

(w/o Bin)

Basic

Electrical

Ice Type Condenser

Type

W x D x H

FME2400AE-32A 42" x 24" x 27" 208-320/60/1 Flake Air

FME2400WE-32A 42" x 24" x 27" 208-320/60/1 Flake Water

FME2400AE-3A 42" x 24" x 27" 208-230/60/3 Flake Air

FME2400WE-3A 42" x 24" x 27" 208-230/60/3 Flake Water

NME1850AE-32A 42" x 24" x 27" 208-320/60/1 Nugget Air

NME1850WE-32A 42" x 24" x 27" 208-320/60/1 Nugget Water

NME1850AE-3A 42" x 24" x 27" 208-230/60/3 Nugget Air

NME1850WE-3A 42" x 24" x 27" 208-230/60/3 Nugget Water

Refrigerant Charge*

Air Cooled 30 oz.

R-404A

Water

Cooled

24 oz.

R-404A

* Per system. Always go by the nameplate.

January 1994

Page 2

NME1850 & FME2400

FOR THE INSTALLER: Environmental Limitations

Installation Limitations:

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

Min

Air Temperature 50

0

F

Water Temperature 40

0

F

Max

100

0

F

100

0

F

Water Pressure

Voltage

20 PSI

-5%

(Compared to the nameplate)

80 PSI

+10%

Operating the machine outside of the limitations is misuse and can void the warranty.

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 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. There is no one type of water filter that will be effective in all situations. That is why a water test is important.

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 CUL.

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 - B90

1.25"

January 1994

Page 3

21.12"

Drain

3/4"

FPT

NME1850 & FME2400

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 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.

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.

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 side. Secure the machine to the bin with the hardware provided with the machine.

Remove the front panel and remove any shipping blocks.

January 1994

Page 4

FOR THE INSTALLER: Location

NME1850 & FME2400

ALLOW ROOM

FOR AIR

CIRCULATION

AND SERVICE

ACCESS

DO NOT STACK ANYTHING IN

FRONT OF THE MACHINE(S)

January 1994

Page 5

NME1850 & FME2400

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, and connect to the single 3/8" male flare at the back of the cabinet. This connection supplies water to both ice making systems. 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 single 3/8"

FPT condenser inlet at the back of the cabinet.

This connection supplies water to both water cooled condensers. The water pressure to all lines must always be above 20 psig, and below 80 psig.

Drains

Air Cooled Models: There is one 3/4" FPT drain for both ice making systems 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. There is one drain for both ice making systems. 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.

COMPLETE PLUMBING INSTALLATION, WATER

COOLED

AIR COOLED

MODELS

FIELD

SUPPLIED

FILTER

HAND

VALVE

WATER

INLET

VENTED

DRAIN

CONDENSER

INLET

WATER

COOLED

HAND

VALVE

WATER

FILTER

CONDENSER

DRAIN

VENTED

DRAIN

January 1994

Page 6

NME1850 & FME2400

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.

WATER COOLED

AIR COOLED

POWER

SUPPLY

January 1994

Page 7

NME1850 & FME2400

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 above 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 1994

Page 8

NME1850 & FME2400

START UP

Pre-Start Inspection

1. Remove the front and side service 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 8).

The following procedure applies to each of the two separate ice making systems.

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 gear motor starts.

B. After the gear motor starts, the compressor will start.

Start Up

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 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.

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.

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 Scotsman.

5. The unit should soon be making ice, if desired, the low side pressure of each system may be checked: it should be 33 psig + or - 2 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.

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

January 1994

Page 9

NME1850 & FME2400

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 450 psig.

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

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.

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

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

Expansion valve : The refrigerant metering device.

There are two of each of the above components in these machines.

Hi Pressure Cut

Outs

Condenser

Expansion Valve

Reservoir

Drain Tube

Gearbox

Control Box

January 1994

Page 10

NME1850 & FME2400

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 contactor.

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.

LOW

PRESSURE

CUT OUT

SWITCH

POTENTIAL

RELAY

TRANSFORMER

ON/OFF SWITCH

CONTACTOR

CIRCUIT

BOARD

January 1994

Page 11

NME1850 & FME2400

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 (Divider): 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.

ICE SWEEP

BEARING

BREAKER/DIVIDER

AUGER

EVAPORATOR

WATER

SEAL

MOTOR

January 1994

Page 12

NME1850 & FME2400

ELECTRICAL SEQUENCE

Refer the wiring diagram as needed.

The following description applies to either one of the two ice making systems. They operate independently of each other.

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 compressor relay and auger motor relay become energized, connecting power to the windings of the auger motor.

•

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 stay 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 bin empty light goes out, and the machine shuts down.

Shut Down consists of:

•

The compressor relay 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 switch) opens, the machine will stop immediately

(through the relays on the circuit board). It must be manually reset at the control .

•

If the low pressure control (cut out switch) opens, the machine will stop immediately

(through the relays on the circuit board). It must be manually reset at the control.

•

Each master switch is the manual control for each system, but it is not a service disconnect.

January 1994

Page 13

NME1850 & FME2400

OPERATION: Water

Water enters the machine through the 3/8" male flare at the rear of the cabinet, splits into two separate lines, flows to a strainer at each reservoir and then to each water reservoir which it enters through the float valve. The water then goes out the bottom of the reservoir tanks to the bottom of each evaporator.

Reservoir overflow or evaporator condensation is routed to the drain.

Water cooled models have a separate water circuit for the cooling water: it enters the fitting at the rear, divides and goes to the two water regulating valves, then through each water cooled condenser, reconnects into one drain and down the drain.

WATER INLET

RESERVOIR

WATER

LEVEL

EVAPORATOR

DRAIN

STRAINER ICE

CHUTE

EVAPORATOR

DRAIN

EVAPORATOR INLET

WATER SCHEMATIC

January 1994

Page 14

NME1850 & FME2400

OPERATION: Refrigeration

The following description applies to each of the two separate ice making systems.

Beginning at the compressor, the refrigerant is compressed into a high temperature gas. The discharge line directs this gas to the condenser.

At the condenser (air or water cooled) the gas is cooled by either air or water and it then condenses into a liquid. This high pressure liquid then goes through the liquid line 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 the compressor, where the cycle is repeated.

System Information @ 90 o

F. air and 70 o

F. water:

•

Suction Pressure: 33-34 PSIG

•

Discharge Pressure, air cooled - 275 PSIG

•

Discharge Pressure, water cooled - 245 PSIG

Compressor Amps:

•

3 phase - 2.8

•

Single phase 4.3

CONDENSER

FAN

MOTOR

LIQUID

LINE

DISCHARGE

LINE

SUCTION LINE

EVAPORATOR

THERMOSTATIC

EXPANSION

VALVE

HIGH PRESSURE

CUT OUT SWITCH

COMPRESSOR

Refrigeration Schematic

January 1994

Page 15

GEAR

MOTOR

NME1850 & FME2400

MAINTENANCE AND CLEANING

To properly clean and maintain this product, these steps must be followed for both systems.

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.

ICE MAKING SYSTEM: In place cleaning

1. Check and clean any water treatment devices, if any are installed.

2. Remove screws and 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 water should be between 90-115 degrees F.

12. Go thru steps 13-19 to sanitize the ice machine water system.

13. Mix two gallons of sanitizer solution. Use an approved sanitizer.

A possible sanitizer solution may be obtained by mixing two gallons of warm (90-115 o

F.) potable water with 1 ounce of household bleach.

14. Slowly pout the sanitizer solution into the water reservoir until the float rises, then switch the master switch ON.

15. As the ice machine uses water from the reservoir, continue to pour the sanitizer solution into the reservoir.

16. After 1 ⁄

2

of the sanitizer solution has been added to the reservoir, and the reservoir is nearly empty, switch the master switch OFF.

17. Drain the reservoir and thoroughly wash the interior of the reservoir and cover with sanitizer solution.

18. Remove the block from the float in the water reservoir.

19. Switch the master switch to ON

20. Continue ice making for at least 15 minutes, to flush out any cleaning solution.

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.

DO NOT USE any ice produced from the cleaning solution. Be sure no ice remains in the bin.

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

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

January 1996

Page 16

21. Remove all ice from the storage bin.

22. Add warm water to the ice storage bin and thoroughly wash and rinse all surfaces within the bin.

23. Sanitize the bin interior by washing the interior of the bin with the balance of the sanitizer solution.

24. Switch the master switch ON.

25. Replace the front panel.

NME1850 & FME2400

MAINTENANCE AND CLEANING

These steps must be followed for both systems.

ICE LEVEL SENSORS:

SLIDE TO REMOVE

Disconnect electrical power before beginning.

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.

PULL UP TO

REMOVE PROBE

CLEAN THE

LIGHT SENSORS

RESERVOIR

CLEAN THE

WATER LEVEL

PROBE

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

CAUTION: THE TIP IS

MADE OF GLASS

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

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

A. Check the bearing by:

• removing the ice chute cover

• unscrewing the ice sweep

• removing the water shed

• unscrewing the breaker cover.

• unscrewing the auger stud

January 1994

Page 17

Inspect the assembly, looking for wear.

See Removal and Replacement to replace bearing or seals. Reverse to reassemble.

4. Check and tighten all bolts and screws.

ICE SWEEP

BREAKER

COVER

NME1850 & FME2400

MAINTENANCE: Air Cooled

5. Clean each air cooled condenser. Use a vacuum cleaner or coil cleaner if needed. Do NOT use a wire brush.

Disconnect electrical power before beginning.

A. Remove top panel.

TOP

PANEL

FAN MOTOR

ASSEMBLY

C. Pull fan motor assembly off of locating pins and out of the unit.

B. Remove two screws, and unplug the fan motors.

CAP SCREW

LOCATING

PINS

UNPLUG

LEADS

D. Clean the condenser; reassemble by placing the fan motor assembly onto the locating pins, replacing the mounting screws, plugging the fan motors back in, and replacing the top panel.

Reconnect power.

January 1994

Page 18

MAINTENANCE AND CLEANING: Auger

NME1850 & FME2400

In some areas the water supply to the ice maker 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

Note: Water filters can filter out suspended solids, edges, handle with care.

but not dissolved solids. ‘‘Soft’’ water may not be

//////////////////////////////////////////// the complete answer. Check with a water

/////////////WARNING/////////////// treatment specialist regarding water treatment.

For more information on removal of these parts, see REMOVAL AND REPLACEMENT.

ALLEN

SCREWS

BREAKER &

BEARING &

AUGER

ASSEMBLY

Disconnect electrical power before beginning.

1. To remove the auger, remove the front and top panels.

2. Push back bail clamp holding ice chute cover to ice chute, and remove cover.

3. Unscrew and remove ice sweep.

4. Loosen band clamp under ice chute, and remove ice chute from evaporator.

5. Remove 4 allen screws holding breaker to evaporator.

6. Drain the evaporator by pulling down and uncapping the evaporator drain tube.

7. Pull up to remove auger.

After the auger has been removed, allow the auger to dry: if the auger is not bright and shiny, it must be cleaned.

Clean the auger and evaporator as required. DO

NOT HONE THE EVAPORATOR.

8. Replace the water seal.

9. Reverse to reassemble.

January 1994

Page 19

NME1850 & FME2400

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 2 reset switches , (high and low pressure): depress and release each switch. If the still does not start, check: the spout switch; the high and the low side pressures.

D. Check the low pressure cut out, if closed, go to E; if it is open, it could be due to:

•

Low refrigerant charge

•

The auger not turning

•

Restricted system

•

TXV not opening

1. Check the low side pressure, the low pressure cut out opens at pressure below 4 psig.

If open, reset and: 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 will operate,(normal low side pressure being about 32 psig) stop and look for a leak, recover, 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 charge.

Check for a Thermostatic Expansion Valve that does not open, if defective, replace it. Replace the drier, evacuate, and weigh in the nameplate charge.

E. Check the high pressure cut out, if closed, go to F; if open check:

1. The pressure control opens at 450 psig. Check the high side pressure, reset the control,

and observe: on water cooled, that water soon begins to flow from the condenser drain; or, on air cooled, that the fan is forcing air through the condenser. If the unit trips out on pressures below 400 psig, replace the control. If the pressures rise above the trip out point, and the unit shuts down: a. Check for adequate water flow on water cooled, if adequate, clean the interior of the condenser. If the pressures are still too high replace the water regulating valve.

b. Check for adequate air flow on air cooled. Clean the condenser and (if used) the filter. 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.

5. Check the water level in the reservoir. The machine will not run if there is not enough water in the reservoir.

1. Restore/adjust water level. See the next step.

January 1994

Page 20

NME1850 & FME2400

SERVICE DIAGNOSIS: Condition - No Ice Being Produced

STATUS: NOTHING OPERATES

G. 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.

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 Scotsman Electronic 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.

MORE INFORMATION ON THE TESTER CAN BE FOUND ON THE LAST PAGES OF THE MANUAL.

January 1994

Page 21

NME1850 & FME2400

SERVICE DIAGNOSIS: Condition - No Ice Produced

STATUS: GEAR MOTOR OPERATES, COMPRESSOR DOES NOT

A. Check the compressor relay.

The relay is on the circuit board, if it does not supply power to the contactor coil, the

compressor will not run.

1. Check for power at the contactor 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 contactor coil,

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

2. Check the contactor coil. If the coil is open, replace the contactor.

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.

B. Check the compressor

1. Check the compressor start relay.

2. Check the start capacitor.

3. Check the windings of the compressor for open windings or shorts to ground.

Replace those items found defective.

January 1994

Page 22

NME1850 & FME2400

SERVICE DIAGNOSIS: Condition - Low Ice Production

STATUS: EVERYTHING IS OPERATING

A. Check the air cooled condenser for dirt. Clean as required. Check the head pressure on water cooled.

Adjust as required. If the head pressure is very high:

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

2. Water cooled. Check for high water temperatures, or low water pressure.

Correct as needed.

3. The refrigerant may contain non condensable gases, recover, evacuate, and recharge per nameplate.

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 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, 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.

January 1994

Page 23

NME1850 & FME2400

REMOVAL AND REPLACEMENT: Water Reservoir & Bin Controls

WATER RESERVOIR

1. Shut off water supply.

2. Remove front panel.

3. Remove reservoir cover.

4. Disconnect water inlet tube from reservoir inlet fitting.

5. To remove float valve, push in on "locking tab" as shown and pull valve up.

Note: The plunger/seat is available as a separate part.

6. To remove reservoir, pull up and remove water sensor.

7. Disconnect water outlet tubes.

8. Remove the two screws holding reservoir to bracket.

9. Remove reservoir from machine.

10. Reverse steps 1-9 to reassemble.

Float Valve

Plunger/Seat

Locking

Tab

SLIDE BIN

CONTROLS IN

AND OUT

ICE

CHUTE

BIN CONTROLS (Ice Level Sensors)

1. Disconnect electrical power.

2. Remove the front panel.

3. Remove the control box cover.

4. Locate the 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 bin control at 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 ice chute.

January 1994

Page 24

NME1850 & FME2400

REMOVAL AND REPLACEMENT: Bearing And Breaker

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

To Remove the Breaker Bearing Assembly:

Disconnect electrical power before beginning.

1. Remove panels and disconnect electrical power.

2. Push bail clamp back and remove ice chute cover.

3. Unscrew and remove ice sweep.

4. Remove insulation halves from outside of ice chute, loosen band clamp under 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.

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

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 and Step 6

BEARING

ICE

SWEEP SEALS

SLOTTED

COLLAR

AUGER

STUD

BREAKER

COVER

January 1994

Page 25

NME1850 & FME2400

REMOVAL AND REPLACEMENT: Auger

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.

Disconnect electrical power before beginning

Use care when removing the auger, it has very sharp edges.

2. Remove ice chute cover.

3. Unscrew ice sweep.

4. Loosen band clamp and remove ice chute body.

5. 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.

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

d. Lift up & remove breaker from evaporator.

e. If the auger is stuck use a slide hammer type puller to pull on the auger at the threaded hole.

The size of that hole is 5/8"-18.

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

1. 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.

CAUTION

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

2. 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.

BREAKER

AND AUGER

ASSEMBLY

SLIDE HAMMER

PULLER

Note: If the auger is stuck, the breaker must be removed from the auger.

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.

THREAD INTO THE

AUGER HERE

January 1994

Page 26

NME1850 & FME2400

REMOVAL AND REPLACEMENT: Water Seal

To Remove the Water Seal:

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

1. The gear motor/evaporator assembly will have to be exposed.

2. Remove the 4 hex head cap screws holding the evaporator to the gear motor assembly. Lift the evaporator up and off of the gear motor.

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.

REMOVAL 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.

REPLACING THE WATER SEAL

WATER SEAL

RETAINING

RING

PLACE FOOD

GRADE SEALANT

HERE

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 gear motor.

January 1994

Page 27

NME1850 & FME2400

REMOVAL AND REPLACEMENT: Evaporator

To Replace the Evaporator:

(Assuming all the steps for removal of the thrust bearing, breaker, auger, and water seal have been performed.)

Disconnect electrical power before beginning.

1. Discharge 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.

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 gear motor has been inspected, fasten the evaporator to the gear motor. 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.

FME Evaporator Shown

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’’) sweat in the new evaporator at the old tubing connections.

ICE CHUTE

ICE SWEEP

AUGER

EVAPORATOR

BEARING

BREAKER/DIVIDER

January 1994

Page 28

NME1850 & FME2400

REMOVAL AND REPLACEMENT: Gearmotor

Disconnect electrical power before beginning.

SEAL

WATER SHED

CENTRIFUGAL

SWITCH

AUGER DRIVE MOTOR

COVER &

OUTPUT GEAR

ASSEMBLY

Note: There are two gear motors in each unit.

ROTOR BEARING

SEAL

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 gear motor to the base of the machine.

3. Remove the gear motor from the ice maker.

Bench test the gear motor, check for oil leaks, noise, and amp draw.

To Inspect the gear motor.

A) Remove the cap screws holding the gear motor 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 gearcase cover, output gear, bearings and output shaft are a pressed together assembly.

January 1994

Page 29

NME1850 & FME2400

REMOVAL AND REPLACEMENT

Removing Condenser Fan Motor Assembly

Disconnect electrical power before beginning.

CAP SCREWS

LOCATING

PINS

FAN

MOTOR

WIRE

1. Remove the top panel.

2. Unplug the two fan motor wire leads from the fan motors.

3. Remove two hex head bolts from top end of fan motor assembly, (see the illustration).

4. Lift up, and pull out the fan motor assembly.

5. Repair as needed.

6. To reassemble: Place the fan motor assembly lower flange holes over the two allen head cap screws in the base, and reinstall the hex head bolts at the top of the assembly. Plug the fan motors back in, and replace the top panel.

January 1994

Page 30

FAN MOTOR

ASSEMBLY

NME1850 & FME2400

Removal and Replacement: Refrigeration System

This ice machine uses R-404A refrigerant and polyolester oil. Do NOT use mineral oil in this refrigeration system.

•

R-404A is a "Near Azeotrope" so liquid charging is required:

•

When the system is serviced, a special liquid line drier is required. It is included with replacement compressors.

•

HP62 is not compatible with mineral oil, so these ice machines use

Polyolester oil. Polyolester oil absorbs water very easily. When one of these refrigeration systems 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 Halongenated refrigerant or HFC-134a will work. Check with the leak detector manufacturer if in doubt.

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 Cap to

8-12 ft. lb..

ACCESS

VALVE

Torque Cap to

7-12 ft. lb..

Pressure-Temperature Chart for HP62

VAPOR VAPOR

TEMP. PRESS. TEMP. PRESS.

56

58

60

62

64

66

68

48

50

52

54

40

42

44

46

32

34

36

38

24

26

28

30

16

18

20

22

8

10

12

14

0

2

4

6

-8

-6

-4

-2

(DEG F) (PSIG) DEG F) (PSIG)

-20 17 70 146

-18 18 72 150

-16

-14

-12

-10

20

21

23

24

74

76

78

80

155

161

166

171

26

28

29

31

33

35

37

39

82

84

86

88

90

92

94

96

177

182

188

194

200

206

212

219

41

43

46

48

50

53

55

58

60

63

66

69

72

75

78

81

98

100

102

104

106

108

110

112

114

116

118

120

122

124

126

128

225

232

239

246

253

260

268

275

283

291

299

307

316

324

333

342

85

88

91

95

130 351

132 360

134 370

136 379

99 138 389

102 140 399

106 142 409

110 144 420

114 146 430

118 148 441

123 150 452

127 152 464

132 154 475

136 156 487

141 158 499

January 1994

Page 31

NME1850 & FME2400

CIRCUIT BOARD TESTING

WARNING

These procedures require the machine to be connected to the power supply. The voltages of the electronic circuit are very low, but HIGHER

VOLTAGES ARE PRESENT IN THE UNIT. Do not touch anything but the tester while the unit is being checked out. Make all connections to the circuit board with the ELECTRICAL POWER OFF.

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.)

If the "NO WATER" indicator is lit, but inspection shows that the water level in the reservoir is above the top of the water level sensor, OR the "BIN EMPTY" indicator is off while inspection shows that the ice level sensors are properly aligned, clean and not obstructed, use the tester as follows:

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.

PHOTO TRANS 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 Bin Empty light is ON, wait 10-20 seconds for the machine to start, if the machine starts, replace the ice level sensors.

If the Bin Empty light does not come ON, the circuit board should be replaced.

Water Level 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.

LED

LIGHT GOES

ON

LIGHT ON

WATER SENS

SWITCH TO

‘‘FULL ’’

3. Unplug ‘‘water sen’’ connector from control board.

4. Plug ‘‘water sen’’ connector from Scotsman tester into circuit board.

Bin Control 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.

SWITCH TO

‘‘NO WATER ’’ 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.

If the Bin Empty light is ON, wait 10-20 seconds for the machine to start. The machine should start.

January 1994

Page 32