Scotsman FME1200 Service manual

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Scotsman FME1200 Service manual | Manualzz

NME950 & FME1200

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

It features: front service for the freezer, gear motor, control box, water reservoir, and bin control; an electronic circuit for monitoring ice and water level; a thermostatic expansion valve; and R-404A as the refrigerant.

TABLE OF CONTENTS

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

SAMPLE BIN AND MACHINE COMBINATIONS . . . . . . . . . . . . . . . . . . . . . . Page 3

FOR THE INSTALLER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 4

FOR THE PLUMBER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 6

FOR THE ELECTRICIAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 7

START UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 9

COMPONENT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 10

COMPONENT DESCRIPTION: Control Box . . . . . . . . . . . . . . . . . . . . . . . . Page 11

ELECTRICAL SEQUENCE: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 13

OPERATION: Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 14

OPERATION: Refrigeration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 15

OPERATION: Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 15

SANITIZING AND CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 16

MAINTENANCE AND CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 17

MAINTENANCE: Air Cooled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 18

MAINTENANCE AND CLEANING: Auger . . . . . . . . . . . . . . . . . . . . . . . . . Page 19

SERVICE DIAGNOSIS: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 20

REMOVAL AND REPLACEMENT: Water Reservoir & Bin Controls . . . . . . . . . . . . Page 22

REMOVAL AND REPLACEMENT: Bearing And Breaker . . . . . . . . . . . . . . . . . . Page 23

REMOVAL AND REPLACEMENT: Auger . . . . . . . . . . . . . . . . . . . . . . . . . Page 24

REMOVAL AND REPLACEMENT: Water Seal . . . . . . . . . . . . . . . . . . . . . . . Page 25

REMOVAL AND REPLACEMENT: Evaporator . . . . . . . . . . . . . . . . . . . . . . . Page 26

REMOVAL AND REPLACEMENT: Gearmotor . . . . . . . . . . . . . . . . . . . . . . . Page 27

REMOVAL AND REPLACEMENT: Fans . . . . . . . . . . . . . . . . . . . . . . . . . . Page 28

REFRIGERATION SYSTEM SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 29

LIQUID CHARGING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 30

CIRCUIT BOARD TESTING: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 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 the warning symbol where it appears. It marks a possible hazard.

January 1995

Page 1

NME950 & FME1200

FOR THE INSTALLER

BACK VIEW: AIR COOLED

Note: Allow 6" behind and 6" above either unit for air circulation, utility connections, and service.

ELECTRICAL

INLET

BACK VIEW: WATER COOLED

ELECTRICAL

INLET

WATER

INLET

3"

5.25"

9.5"

3"

5.25"

7.3"

9.43"

WATER INLET

3/8" FLARE

DRAIN

3/4" FPT

2.1"

5.7"

Condenser Inlet 3/8" FPT

Condenser Drain 1/2" FPT

DRAIN

3/4" FPT

2.9"

3.4"

4.9"

7.46"

This machine is designed to fit the following

Scotsman storage bins:

B90 and extensions (with bin top KBT18)

BH800 using bin top KBT15 (one unit).

BH800 (two units, no bin top required).

BH900 with KBT24 (one unit)

BH900 with KBT25 (two units side by side)

When installing a new system, check to be sure that everything is on site before beginning:

Correct Bin

Correct Ice Machine

Correct Bin Top (if required)

All kits, legs, and information required for the specific job.

SPECIFICATIONS : ICE MAKER

Model Number Dimensions

(w/o bin)

W x D x H

Basic

Electrical

FME1200AE-3A

FME1200WE-3A

FME1200AE-32A

FME1200WE-32A

NME950AE-3A

NME950WE-3A

NME950AE-32A

NME950WE-32A

21" x 24" x 27" same same same same same same same

Installation Limitations:

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

Air Temperature

Min

50

0

F

Water Temperature 40

0

F

Max

100

0

F

100

0

F

Water Pressure

Voltage

20 PSI

-5%

80 PSI

+10%

(Compared to the nameplate)

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

208-230/60/3 same

208-230/60/1 same

208-230/60/3 same

208-230/60/1 same

January 1995

Page 2

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

SPKFM21 may be field installed to convert the unit to a stainless steel finish.

Ice Type Condenser

Type

FLAKE same same same

Nugget same same same

Air

Water

Air

Water

Air

Water

Air

Water

Refrigerant Charge*

Air Cooled 30 oz

R-404A

Water

Cooled

24 oz

R-404A

* Always go by the nameplate charge.

Note: 50 Hz (-6) models have also been produced.

NME950 & FME1200

SAMPLE BIN AND MACHINE COMBINATIONS

Air Flow on

All Air

Cooled

Models is In the Front and Out the

Back

FME1200 ON BH550*

NME950 ON BH800*

The Nameplate is located on the back of the machine.

FME1200 ON BH900*

* Bin Top Kit Required

January 1995

Page 3

NME950 & FME1200

FOR THE INSTALLER

Typical Storage Bin with Extension and Bin Top

Location:

After uncrating and inspection, the unit is ready for installation. It is important that the machine be installed in a location where it has enough space around it to be accessible for service, and minimum of 6" be allowed at the back for air circulation on air cooled models. Try to avoid hot, dirty and crowded locations. Be sure that the location for the machine is within the environmental limitations.

Storage Bin:

Tip the storage bin on its back, using parts of the carton to protect the exterior finish. Install the legs into the threaded holes in the bottom of the bin.

Turn the leg levelers all the way in preparation for leveling later. Return the bin to the upright position, remove paper covering the bin gasket.

Note: Do not push bin into position, but lift it there.

Pushing a bin, especially one with ice in it, can cause damage to the legs and the leg mounts.

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

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.

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.

January 1995

Page 4

FOR THE INSTALLER: Location

TWO UNITS ON ONE BIN

NME950 & FME1200

DO NOT STACK ANYTHING IN

FRONT OF THE MACHINE(S)

ALLOW ROOM

FOR AIR

CIRCULATION

AND SERVICE

ACCESS

January 1995

Page 5

NME950 & FME1200

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 is one 3/4" FPT drain at the back of the cabinet, the drain line is of the gravity type, and 1/4 inch per foot fall is an acceptable pitch for the drain tubing. There should be a vent at the highest point of the drain line, and the ideal drain receptacle would be a trapped and vented floor drain. Use only 3/4" rigid tubing.

Water Cooled Models : In addition to the above mentioned drain, a separate condenser drain must be installed. Connect it to the 1/2" condenser drain connection at the back of the cabinet.

Storage Bin : A separate gravity type drain needs to be run, similar to the air cooled drain. Insulation of this drain line is recommended.

AIR COOLED

MODELS

WATER

COOLED

CONDENSER

INLET

HAND

VALVE

FIELD

SUPPLIED

FILTER

HAND

VALVE

VENTED

DRAIN

WATER

FILTER

CONDENSER

DRAIN

VENTED

DRAIN

WATER

INLET

January 1995

Page 6

NME950 & FME1200

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

POWER

SUPPLY

AIR COOLED

January 1995

Page 7

NME950 & FME1200

FOR THE INSTALLER

Final Check List

1. Is the ice system installed indoors in a location where the air and water temperatures are controlled, and where they do not exceed the design limitations?

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

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

4. Has the machine and bin been leveled?

5. Is there a minimum of 6" clearance at the back of the machine for proper service access and air circulation?

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

7. Has the machine been secured to the bin?

8. Is there clearance over the top of the machine for service access?

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

10. Have all of the shipping blocks been removed?

January 1995

Page 8

NME950 & FME1200

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).

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 the Scotsman Factory.

5. The unit should soon be making ice, if desired, the low side pressure may be checked: it should be 32 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 warranty registration form, and mail it to Scotsman.

January 1995

Page 9

NME950 & FME1200

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.

AIR COOLED

CONTROL BOX

CONDENSER

EXPANSION

VALVE

RESERVOIR

Hi Pressure

Cut Out

DRAIN

TUBE

ICE CHUTE

COMPRESSOR

January 1995

Page 10

ICE LEVEL

SENSORS

COMPONENT DESCRIPTION: Control Box

NME950 & FME1200

Contactor: A definite purpose contactor connecting the compressor and the fan motor to the power supply.

Circuit Board: Controls the operation of the ice machine using input from sensors and pressure controls. Switches loads on and off thru relays.

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

Control Box

ON/OFF SWITCH

CONTACTOR

TRANSFORMER

CIRCUIT

BOARD

"No Water " light, glows when there is not enough water in the reservoir

"Bin Empty" light, glows when ice level is below electric eyes.

January 1995

Page 11

NME950 & FME1200

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 1995

Page 12

NME950 & FME1200

ELECTRICAL SEQUENCE:

Refer the wiring diagram as needed.

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 is a manual reset.

••

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

(through the relays on the circuit board). It is a manual reset.

••

The master switch is the manual control for the complete machine, but it is not a service disconnect.

January 1995

Page 13

NME950 & FME1200

OPERATION: Water

Water enters the machine through the 3/8" male flare at the rear of the cabinet, goes to a strainer and then to the water reservoir which it enters through the float valve. The water then goes out the bottom of the reservoir tank to the bottom of the 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, goes to the water regulating valve, then to the water cooled condenser and down the drain.

WATER INLET

RESERVOIR

WATER

LEVEL

EVAPORATOR

DRAIN

STRAINER ICE

CHUTE

EVAPORATOR

DRAIN

January 1995

Page 14

EVAPORATOR INLET

WATER SCHEMATIC

NME950 & FME1200

OPERATION: Refrigeration

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 compressor, where the cycle is repeated.

Refrigeration Schematic

CONDENSER

LIQUID

LINE

DISCHARGE

LINE

SUCTION LINE

EVAPORATOR

FAN

MOTOR

THERMOSTATIC

EXPANSION

VALVE

COMPRESSOR

GEAR

MOTOR

OPERATION: Performance

Typical Low Side Pressure

••

Air Cooled: 34 - 38 PSIG

••

Water Cooled: 32 PSIG

Typical Discharge Pressure

••

Air Cooled: 220 - 275 PSIG

••

Water Cooled: 245 PSIG

Typical Compressor Amp Draw

••

Single phase = 4.3

••

Three phase = 2.8

Superheat

••

5 - 7 degrees

High Pressure Cut Out

••

450 PSIG

January 1995

Page 15

Low Pressure Cut Out

••

0 - 4 PSIG

Refrigerant Charge

••

Air Cooled: 30 ounces HP62

••

Water Cooled: 24 ounces of HP62.

NME950 & FME1200

SANITIZING AND CLEANING

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 and top panels.

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 13-18 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 pour 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. Switch the master switch OFF.

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.

21. Remove all ice from the storage bin.

9. As the ice maker begins to use water from the reservoir, continue to add more cleaning solution to maintain a full reservoir.

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

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.

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

24. Switch the master switch ON.

11. After draining the reservoir, as in step 6, wash and rinse the water reservoir.

25. Replace the panels.

January 1996

Page 16

NME950 & FME1200

MAINTENANCE AND CLEANING

Electrical shock hazard.

Electrical shock can cause personal injury.

Disconnect power before beginning to service components.

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

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

Inspect the assembly, looking for wear.

ICE LEVEL SENSORS:

SLIDE TO REMOVE

CLEAN THE

LIGHT SENSORS

RESERVOIR

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

4. Check and tighten all bolts and screws.

ICE SWEEP

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 .

BREAKER

COVER

January 1995

Page 17

NME950 & FME1200

MAINTENANCE: Air Cooled

Electrical shock hazard.

Electrical shock can cause personal injury.

Disconnect power before beginning to service components.

5. Clean the air cooled condenser.

The air flow on this model is from front to back, so the inside of the machine will have to be available to clean the air cooled condenser. Use a vacuum cleaner or coil cleaner if needed. Do NOT use a wire brush.

A. Disconnect electrical power, and remove the filter. The filter may be cleaned or replaced.

B. Clean the condenser: the condenser may appear to be clean on the surface, but it can still be clogged internally. Check with a flash light from the front to see if light can be seen though the condenser fins. Reverse to reassemble.

TO GAIN ACCESS TO CONDENSER SURFACE:

1. REMOVE TOP PANEL 3. PULL FAN MOTOR ASSEMBLY UP AND OUT

2. REMOVE TWO SCREWS & UNPLUG FAN MOTORS.

4. CLEAN CONDENSER FINS.

January 1995

Page 18

NME950 & FME1200

MAINTENANCE AND CLEANING: Auger

In some areas, the water supply to the ice maker will contain a high concentration of minerals, 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 edges, handle with care.

Note: Water filters can filter out suspended solids, but not dissolved solids. ‘‘Soft’’ water may not be the complete answer. Check with a water treatment specialist regarding water treatment.

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

ALLEN

SCREWS

BREAKER &

BEARING &

AUGER

ASSEMBLY

Turn off the water supply.

Electrical shock hazard.

Electrical shock can cause personal injury.

Disconnect power before beginning to service components.

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 lowering and uncapping the evaporator drain hose.

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 1995

Page 19

NME950 & FME1200

SERVICE DIAGNOSIS:

Symptom

No ice is made, nothing operates

Possible Cause

Unit off due to no power

Unit off due to scale on water level sensor.

Unit off due to high pressure control open.

Probable Correction

Restore Power

Unit off due to master switch in

OFF position.

Switch master switch to ON.

Unit off due to low water level.

Check water supply, filter, strainer, float valve. Correct water supply.

Check/clean ice level sensors.

Unit off due to ice level sensors (photo-electric eyes) blocked.

Clean water level sensor.

Auger motor does not turn.

Low pressure control open

Check for water interruption

(water cooled) or fan motor failure (air cooled).

Winding open, bearings seized. Check/replace auger motor.

Check that auger turns

Check charge.

Check for a restricted system

Check/replace centrifugal switch.

Replace transformer.

Centrifugal switch in auger motor does not close.

No power to circuit board, transformer is open.

Circuit Board gear motor relay will not close

Water level or ice level sensor failed.

No ice, auger motor is turning Compressor contactor coil is open

Compressor will not start

Check, replace board

Check, replace sensor

Check/replace contactor

Check start capacitor.

Check start relay

Check compressor windings

Check, replace board Circuit board compressor relay will not close.

Unit makes ice, but very slowly. High discharge pressure because of a dirty condenser

Low capacity because the auger and evaporator are coated with mineral scale

Low suction pressure due to low refrigerant charge

Clean the air filter and condenser.

Clean the water system

Locate leak. Recover refrigerant, repair leak, replace dryer, evacuate and weigh in the nameplate charge

January 1995

Page 20

NME950 & FME1200

SERVICE DIAGNOSIS

Symptom

Water Leak

Excessive water use

Excessive ice meltage

Possible Cause

Drain plugged up

Probable Correction

Clean out drain

Tubing cracked Replace tubing

Condensation on drain tubing Insulate tubing

Hose off

Reservoir cover off

Reattach hose

Return cover to reservoir

Reservoir cracked

Evaporator water seal leaks

Water cooled model, water regulating valve not adjusted properly.

Replace reservoir

Check base of evaporator & drip pan. If the seal leaks, shut off the water, remove the auger, replace the water seal.

Check gear motor for water infiltration.

Adjust to 245 PSIG discharge pressure

Reservoir float valve leaks thru Replace float valve or seat

Water cooled model, overcharged with refrigerant

Recover and weigh refrigerant.

Weigh in correct charge.

Water cooled model, condenser coated with minerals

Bin drain clogged

Improper installation of drains, they are connected.

Poor fit between bin door and door frame

Acid clean water cooled condenser.

Clean out bin drain.

Drains must be separate.

Adjust or replace

Machine makes too much noise Evaporator coated internally with minerals

Motor bearings dry

Clean with Scotsman Ice

Machine Cleaner

Oil or replace motor

January 1995

Page 21

NME950 & FME1200

REMOVAL AND REPLACEMENT: Water Reservoir & Bin Controls

WATER RESERVOIR

1. Shut off the water supply to the ice maker.

2. Remove front panel.

3. Remove reservoir cover.

4. Disconnect water inlet tube from reservoir inlet fitting.

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

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

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

8. Disconnect water outlet tubes.

9. Remove mounting screws from reservoir bracket, and remove reservoir from ice maker.

10. Reverse to reassemble.

FLOAT

ASSEMBLY

PLUNGER

/SEAT

LOCKING

TABS

ICE

CHUTE

SLIDE BIN

CONTROLS IN

AND OUT

BIN CONTROLS (Ice Level Sensors)

1. Disconnect electrical power.

2. Remove front panel.

3. Remove control box cover.

4. Locate 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 electrical leads connecting the bin control to 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 1995

Page 22

NME950 & FME1200

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.

1. Remove panels and disconnect electrical power.

Electrical shock hazard.

Electrical shock can cause personal injury.

Disconnect power before beginning to service components.

2. Push back bail clamp 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.

Note: Flaker parts are shown in this manual.

Nugget Breakers do NOT have a Slotted Collar.

Step 5-a Step 5-b Step 5-c and Step 6

BEARING

ICE

SWEEP SEALS

SLOTTED

COLLAR

AUGER

STUD

BREAKER

COVER

January 1995

Page 23

NME950 & FME1200

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.

Electrical shock hazard.

Electrical shock can cause personal injury.

Disconnect power before beginning to service components.

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

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 & 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.

WARNING

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

BREAKER

AND AUGER

ASSEMBLY

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.

WARNING

The auger has sharp edges, handle with care.

SLIDE HAMMER

PULLER

THREAD INTO THE

AUGER HERE breaker to evaporator.

b. Lift up on breaker and remove auger from evaporator.

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.

January 1995

Page 24

NME950 & FME1200

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.

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

REMOVAL OF 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 1995

Page 25

NME950 & FME1200

REMOVAL AND REPLACEMENT: Evaporator

Electrical shock hazard.

Electrical shock can cause personal injury.

Disconnect power before beginning to service components.

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.

To Replace the Evaporator:

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

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.

ICE SWEEP

AUGER

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.

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.

ICE CHUTE

BEARING

EVAPORATOR

BREAKER/DIVIDER

January 1995

Page 26

NME950 & FME1200

REMOVAL AND REPLACEMENT: Gearmotor

Electrical shock hazard.

Electrical shock can cause personal injury.

Disconnect power before beginning to service components.

To Remove and Repair the Gear motor

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.

C) Inspect the oil gears and bearings. If there is evidence of water in the oil (rusty metal, too much oil, white oil) replace the oil and damaged parts.

The oil charge is 14 oz. Do not overfill.

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

WATER SHED

CENTRIFUGAL

SWITCH

AUGER DRIVE MOTOR

COVER &

OUTPUT GEAR

ASSEMBLY

ROTOR BEARING

SEAL

January 1995

Page 27

NME950 & FME1200

REMOVAL AND REPLACEMENT: Fans

Electrical shock hazard.

Electrical shock can cause personal injury.

Disconnect power before beginning to service components.

To Remove the Condenser Fan Motor

Assembly

1. Remove top panel.

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

3. Remove the two hex head bolts from the top end of the fan motor assembly.

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 1995

Page 28

NME950 & FME1200

REFRIGERATION SYSTEM SERVICE

General:

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 to

6-8 ft. lb..

Cap, Torque to 8-12 ft. lb..

ACCESS VALVE

Cap, Torque to 7-11 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 1995

Page 29

NME950 & FME1200

LIQUID CHARGING

Instructions for R-404A

In preparation for charging, the low side hose should have a sight glass, and/or a restrictor device (such as a "Charge Faster") installed in it for metering liquid into the low side of the system.

1. After a thorough evacuation to at least 200 microns, shut off the manifold valves and switch off the vacuum pump.

2. Place a drum of R-404A onto an electronic scale.

3. Attach the charging hose to the drum.

4. Open the valve on the drum and purge the charging hose.

5. Zero out the scale.

6. Shut the low side access valve at the ice machine.

Manifold Valve

Sight Glass

Low Side

Access Valve

Manifold Valve

Refrigerant Drum Valve

7. Open the discharge manifold valve full open.

8. Watch the scale, when the correct charge is shown, shut the manifold valve.

Note: If all of the charge will not "go in" the discharge side:

A. Shut the discharge access valve at the ice machine.

B. Switch the machine on.

C. Open the low side access valve at the ice machine.

D. Open the low side manifold valve and observe the sight glass to be certain that only gas is flowing into the system.

High Side

Access Valve

SCALE

Hose Connection Schematic for Liquid Charging

E. When the proper charge is indicated on the scale, shut off the manifold valve(s).

9. Shut off the valve on the refrigerant drum.

10. Re-open the manifold valves until all liquid has flowed out of the hoses.

11. Shut the low side access valve on the ice machine.

12. Remove hoses from ice machine and replace all caps.

January 1995

Page 30

NME950 & FME1200

CIRCUIT BOARD TESTING:

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 "Reset" indicator (located in the "reset" switch) is off and 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:

Bin Control 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.

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.

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.

SWITCH TO

‘‘FULL ’’

PHOTO TRANS

LED

LIGHT GOES

ON

SWITCH TO

‘‘BIN EMPTY ’’

LIGHT GOES

ON

LIGHT

GOES OFF

January 1995

Page 31

NME950 & FME1200

CIRCUIT BOARD TESTING:

Water Level

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

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

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.

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.

LIGHT OFF

LIGHT ON

WATER SENS

SWITCH TO

‘‘NO WATER ’’

SWITCH TO

‘‘WATER ’’

January 1995

Page 32

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