introduction manuals... · 2019-04-29 · according to the final check list (page 8). start up 1....

INTRODUCTIONTo the owner or user: The service manual you arereading is intended to provide you, and themaintenance or service technician, with theinformation needed to install, start up, clean,maintain, and service this ice system.This machine is a modular ice system that fits avariety of Scotsman ice storage bins.

It features: front service for the freezer, gearmotor, control box, water reservoir, and bin control;an electronic circuit for monitoring ice and waterlevel; a thermostatic expansion valve; and R-404Aas the refrigerant.

This manual was printed on recycled paper.Keep it for future reference.

TABLE OF CONTENTSFOR 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0

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.

Note the warning symbolwhere it appears. It marks apossible hazard.

NME950 & FME1200

January 1995Page 1

FOR THE INSTALLER

This machine is designed to fit the followingScotsman 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 surethat everything is on site before beginning:

Correct BinCorrect Ice MachineCorrect Bin Top (if required)All kits, legs, and information required for the specific job.

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

Min MaxAir Temperature 500F 1000FWater Temperature 400F 1000FWater Pressure 20 PSI 80 PSIVoltage -5% +10%

(Compared to the nameplate)Operating the machine outside of the limitations ismisuse and can void the warranty.

The normal finish for the ice machine isenamel-sandalwood. A stainless steel panel kit,SPKFM21 may be field installed to convert the unitto a stainless steel finish.

ELECTRICALINLET

WATERINLET

7.3"5.25"

3"

3.4"

7.46"

Condenser Inlet 3/8" FPT

Condenser Drain 1/2" FPT

DRAIN3/4" FPT 4.9"

2.9"

9.43"

BACK VIEW: WATER COOLED

SPECIFICATIONS : ICE MAKER

ELECTRICALINLET

3"

2.1"

5.7"

WATER INLET3/8" FLARE

DRAIN3/4" FPT

BACK VIEW: AIR COOLED

5.25"

9.5"

Note: Allow 6"behind and 6"

above either unitfor air circulation,

utility connections,and service.

Refrigerant Charge*Air Cooled 30 oz

R-404AWaterCooled

24 ozR-404A

* Always go by thenameplate charge.

Model Number

FME1200AE-3AFME1200WE-3AFME1200AE-32AFME1200WE-32A

NME950AE-3ANME950WE-3ANME950AE-32ANME950WE-32A

Dimensions (w/o bin)W x D x H

21" x 24" x 27"samesamesamesamesamesamesame

BasicElectrical

208-230/60/3same

208-230/60/1same

208-230/60/3same

208-230/60/1same

Ice Type

FLAKEsamesamesame

Nuggetsamesamesame

CondenserType

AirWater

AirWater

AirWater

AirWater

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

NME950 & FME1200

January 1995

Air Flow onAll AirCooled

Models is Inthe Front

and Out theBack

SAMPLE BIN AND MACHINE COMBINATIONS

FME1200 ON BH550* NME950 ON BH800*

FME1200 ON BH900*

* Bin Top Kit Required

The Nameplate islocated on the back

of the machine.

NME950 & FME1200

January 1995

FOR THE INSTALLER

Scotsman Ice Systems are designed andmanufactured with the highest regard for safetyand performance. They meet or exceed thestandards of UL, NSF and CUL. Scotsman assumes no liability or responsibility ofany kind for products manufactured by Scotsmanthat have been altered in any way, including theuse of any part and/or other components notspecifically approved by Scotsman.Scotsman reserves the right to make designchanges and/or improvements at any time.Specifications and design are subject to changewithout notice.

Location:After uncrating and inspection, the unit is ready forinstallation. It is important that the machine beinstalled in a location where it has enough spacearound it to be accessible for service, andminimum of 6" be allowed at the back for aircirculation on air cooled models. Try to avoid hot,dirty and crowded locations. Be sure that thelocation for the machine is within theenvironmental limitations.

Storage Bin:Tip the storage bin on its back, using parts of thecarton to protect the exterior finish. Install the legsinto the threaded holes in the bottom of the bin.Turn the leg levelers all the way in preparation forleveling later. Return the bin to the uprightposition, 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, cancause damage to the legs and the leg mounts.Install the appropriate bin top on the bin, accordingto the instructions for the bin top.

Ice Maker:The machine is heavy, so the use of a mechanicallift is recommended for lifting the machine highenough to install on top of the bin. After the unit isplaced on the bin, line it up so it is even with theback side. Secure the machine to the bin with thehardware provided with the machine.Remove the front panel and remove any shippingblocks.

Typical Storage Bin with Extension and Bin Top

NME950 & FME1200

January 1995

FOR THE INSTALLER: Location

TWO UNITS ON ONE BIN

ALLOW ROOMFOR AIR

CIRCULATIONAND SERVICE

ACCESS

DO NOT STACK ANYTHING INFRONT OF THE MACHINE(S)

NME950 & FME1200

January 1995

FOR THE PLUMBERCONFORM TO ALL APPLICABLE CODES

Water InletAir Cooled Models: The recommended watersupply is clean, cold water. Use 3/8" O.D. coppertubing, connect to the 3/8" male flare at the back ofthe cabinet. Install a hand valve near the machineto control the water supply.Water Treatment: In most areas, a water filter ofsome type will be useful. In areas where the wateris highly concentrated with minerals the watershould be tested by a water treatment specialist,and the recommendations of the specialistregarding filtration and/or treatment should befollowed.Water Cooled Models: A separate 3/8" O.D.copper line is recommended, with a separate handvalve to control it. It is connected to a 3/8" FPTcondenser inlet at the back of the cabinet. Thewater pressure to all lines must always be above20 psig, and below 80 psig.

DrainsAir Cooled Models: There is one 3/4" FPT drainat the back of the cabinet, the drain line is of thegravity type, and 1/4 inch per foot fall is anacceptable pitch for the drain tubing. There shouldbe a vent at the highest point of the drain line, andthe ideal drain receptacle would be a trapped andvented floor drain. Use only 3/4" rigid tubing.Water Cooled Models : In addition to the abovementioned drain, a separate condenser drain mustbe installed. Connect it to the 1/2" condenserdrain connection at the back of the cabinet.Storage Bin : A separate gravity type drain needsto be run, similar to the air cooled drain. Insulationof this drain line is recommended.

WATERCOOLED

HANDVALVE

CONDENSERINLET

WATERFILTER

CONDENSERDRAIN

VENTED DRAIN

AIR COOLEDMODELS

HANDVALVE

FIELDSUPPLIED

FILTER

WATERINLET

VENTEDDRAIN

NME950 & FME1200

January 1995

FOR THE ELECTRICIANCONFORM TO ALL APPLICABLE CODES

The electrical power to the unit is supplied throughthe junction box at the rear of the machine.Check the nameplate (located on the back panel)for the voltage requirements, and for the minimumcircuit ampacity. The machine requires a solidchassis to earth ground wire.

The ice maker should be connected to its ownelectrical circuit so it would be individually fused.Voltage variation must remain within designlimitations, even under starting conditions.All external wiring must conform to national,state, and local electrical codes. The use of alicensed electrician is required to perform theelectrical installation.

WATER COOLED

AIR COOLED

POWERSUPPLY

NME950 & FME1200

January 1995

FOR THE INSTALLERFinal Check List

1. Is the ice system installed indoors in a locationwhere the air and water temperatures arecontrolled, and where they do not exceed thedesign limitations?

2. Is there an electrical service disconnect withinsight of the installed machine? Has the voltagebeen checked, and compared to nameplaterequirements?

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

4. Has the machine and bin been leveled?

5. Is there a minimum of 6" clearance at the backof the machine for proper service access and aircirculation?

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 machinefor service access?

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

10. Have all of the shipping blocks been removed?

NME950 & FME1200

January 1995

START UPPre-Start Inspection

1. Remove the front and side service panels.

2. Check that the styrofoam shipping blocks havebeen removed.

3. Inspect the interior of the machine for loosescrews or wires. Check that no refrigerant linesare rubbing each other. Check that the fan bladeturns freely (air cooled).

4. Check that the unit is installed correctlyaccording to the final check list (page 8).

Start Up1. Go through the prestart inspection.

2. Open the hand valve, observe that water entersthe water reservoir, fills the tube from the reservoirto the evaporator, and then shuts off. Check forleaks.

3. Switch the master switch on.The electrical start up sequence is now onautomatic.A. There should be a short (15 second) delaybefore the gear motor starts.B. After the gear motor starts, the compressor willstart.

4. On air cooled models, the condenser will beginto discharge warm air, on water cooled models,the water regulating valve will open, and warmwater will be discharged into the drain.

5. The unit should soon be making ice, if desired,the low side pressure may be checked: it shouldbe 32 psig + or - 2 psig.The suction line temperature at the compressor isnormally very cold, nearly to the point of frost up tothe compressor body, but not on it.

The air cooled discharge pressure will dependupon air and water temperatures, but should bebetween 200 psig and 280 psig. The water cooled discharge pressure should beconstant at about 245 psig.The above numbers are for new, clean machines,you can expect to see some values higher, andsome lower between different units.

6. THERE ARE NO ADJUSTMENTS TO MAKE ,so replace the panels.

7. Clean and/or sanitize the storage bin interior,wipe off the exterior with a clean, damp cloth.

8. Give the owner/user the service manual, instructhim/her in the operation of the unit, and make surethey know who to call for service.

9. Fill out the manufacturers registration card, andmail it to the Scotsman Factory.

10. Fill out the warranty registration form, and mailit to Scotsman.

NME950 & FME1200

January 1995

COMPONENT DESCRIPTIONControl Box: Contains the electrical controls thatoperate the machine.High Pressure Cut Out Switch : A manual resetswitch sensing the high side refrigeration pressure.It is set to shut the machine off if the dischargepressure should ever exceed 450 psig.Evaporator: A vertical stainless steel tube,refrigerated, and water filled. In it there is astainless steel auger.Compressor: The refrigerant vapor pump.Reservoir: Float operated, it maintains the waterlevel in the evaporator at a constant level, it alsocontains the water level sensor.Water Level Sensor: Senses if there is water inthe reservoir to make ice out of. Will shut themachine off it there is none.

Ice Discharge Chute : Directs the ice producedby the evaporator into the storage bin.Ice Level Sensor: An electronic "eye", it sensesthe presence of ice in the bottom of the icedischarge chute. Operates to turn the ice machineon and off automatically as the level of ice in thebin changes.Gear Motor: An oil filled, speed reductiongearbox, driving the auger.Drain Tube : When uncapped and lowered, drainsthe evaporator.Condenser: Air or water cooled, where the heatremoved in ice making is discharged.Expansion valve : The refrigerant meteringdevice.

AIR COOLED

CONTROL BOX

CONDENSEREXPANSION

VALVE

RESERVOIR

ICE CHUTE

COMPRESSORICE LEVELSENSORS

DRAINTUBE

Hi PressureCut Out

NME950 & FME1200

January 1995

COMPONENT DESCRIPTION: Control BoxContactor: A definite purpose contactorconnecting the compressor and the fan motor tothe power supply.Circuit Board: Controls the operation of the icemachine using input from sensors and pressurecontrols. Switches loads on and off thru relays.Transformer: Supplies low voltage to the circuitboard.

Low Pressure Cut Out Switch: A manual resetcontrol that shuts off the ice machine when the lowside pressure drops below a preset point, 0-4 psig.Potential Relay : The compressor start relay.On/Off Switch: Manual control for the machine.

ON/OFF SWITCHLOWPRESSURECUT OUTSWITCH

POTENTIALRELAY

TRANSFORMER

CONTACTOR

CIRCUITBOARD

"No Water " light,glows when there isnot enough water in

the reservoir

"Bin Empty" light,glows when ice level is

below electric eyes.

Control Box

NME950 & FME1200

January 1995

COMPONENT DESCRIPTIONEvaporator : A refrigerated vertical tube filled withwater 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 theevaporator.Water Seal: A two part "face" seal, the top halfrotating 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 revolveswith the auger to "sweep" the ice into the ice chute.Breaker (Divider): Where the ice is compressedand much of the extra water is squeezed out of itbefore it is discharged into the bin. Motor: A split phase motor that drives the gearreducer.Thrust Bearing: As the ice is pushed up theevaporator, the auger is thrust down, and pressurefrom the auger thrust is taken up by this bearing.

WATERSEAL

ICE SWEEP

BEARING

BREAKER/DIVIDER

AUGER

EVAPORATOR

MOTOR

NME950 & FME1200

January 1995

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 masterswitch 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, thecircuit board will allow the machine to start up.

Start up consists of:••The compressor relay and auger motor relay

become energized, connecting power to thewindings of the auger motor.

••The auger motor starts, and the centrifugalswitch closes, connecting power to thecompressor contactor coil.

••The contactor is energized, connecting powerto the compressor, and the compressor starts.

••As ice goes past the ice level sensors, the binempty light will stay on, and the machine willcontinue to run, unless the ice stays betweenthe sensors for more than 15 seconds (bin full).At that point, the bin empty light goes out, andthe 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 2more minutes, clearing out ice in theevaporator, and then

••The auger motor relay opens, and the augermotor stops.

If the ice level sensor is clear (bin empty) for morethan 15 seconds, the machine will start up again.Another purpose of the circuit board is to turn themachine off if there is not enough water in themachine.

••When the water level in the reservoir fallsbelow the water level sensor, the machine will"shut down"

••When the water refills the reservoir, themachine 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 amanual reset.

••If the low pressure control (cut out switch)opens, the machine will stop immediately(through the relays on the circuit board). It is amanual reset.

••The master switch is the manual control for thecomplete machine, but it is not a servicedisconnect.

NME950 & FME1200

January 1995

OPERATION: WaterWater enters the machine through the 3/8" maleflare at the rear of the cabinet, goes to a strainerand then to the water reservoir which it entersthrough the float valve. The water then goes outthe bottom of the reservoir tank to the bottom ofthe evaporator.

Reservoir overflow or evaporator condensation isrouted to the drain. Water cooled models have aseparate water circuit for the cooling water: itenters the fitting at the rear, goes to the waterregulating valve, then to the water cooledcondenser and down the drain.

EVAPORATORDRAIN

WATERLEVEL

EVAPORATOR

ICECHUTE

DRAIN

STRAINER

WATER SCHEMATIC

RESERVOIR

WATER INLET

EVAPORATOR INLET

NME950 & FME1200

January 1995

OPERATION: RefrigerationBeginning at the compressor, the refrigerant iscompressed into a high temperature gas. Thedischarge line directs this gas to the condenser.At the condenser (air or water cooled) the gas iscooled by either air or water and it then condensesinto a liquid. This high pressure liquid then goesthrough the liquid line to the expansion valve. The thermostatic expansion valve meters liquidrefrigerant into the evaporator, the volume of liquidrefrigerant depending upon the temperature of the

evaporator; warmer evaporators get morerefrigerant and colder evaporators get less. At the evaporator, the refrigerant enters an area ofrelatively low pressure, where it can easily "boiloff" or evaporate. As it evaporates, it absorbs heatfrom the evaporator and whatever is in contactwith it (such as the water inside it). After theevaporator, the refrigerant, now a low pressurevapor, goes through the suction line back tocompressor, where the cycle is repeated.

CONDENSER

FAN MOTOR

LIQUIDLINE

THERMOSTATICEXPANSION

VALVE

SUCTION LINE

GEARMOTORCOMPRESSOR

DISCHARGE LINE

Refrigeration Schematic

EVAPORATOR

OPERATION: PerformanceTypical Low Side Pressure

•• Air Cooled: 34 - 38 PSIG

•• Water Cooled: 32 PSIGTypical Discharge Pressure

•• Air Cooled: 220 - 275 PSIG

•• Water Cooled: 245 PSIGTypical Compressor Amp Draw

•• Single phase = 4.3

•• Three phase = 2.8Superheat

•• 5 - 7 degreesHigh Pressure Cut Out

•• 450 PSIG

Low Pressure Cut Out•• 0 - 4 PSIG

Refrigerant Charge•• Air Cooled: 30 ounces HP62

•• Water Cooled: 24 ounces of HP62.

NME950 & FME1200

January 1995

SANITIZING AND CLEANING

A Scotsman Ice System represents a sizable investment of time and money in any company’s business. Inorder 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, andless costly in the long run, to avoid possible down time by keeping it clean; adjusting it as needed; and byreplacing worn parts before they can cause failure. The following is a list of recommended maintenancethat 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 cleaning1. 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 andblock the float up.6. Drain the water reservoir and freezer assemblyusing the drain tube attached to the freezer waterinlet. Return the drain tube to its normal uprightposition and replace the end cap.7. Prepare the cleaning solution: Mix eightounces of Scotsman Ice Machine Cleaner withthree quarts of hot water. The water should bebetween 90-115 degrees F.

8. Slowly pour the cleaning solution into the waterreservoir until it is full. Wait 15 minutes, thenswitch the master switch to ON.9. As the ice maker begins to use water from thereservoir, continue to add more cleaning solutionto maintain a full reservoir.10. After all of the cleaning solution has beenadded to the reservoir, and the reservoir is nearlyempty, switch the master switch to OFF.11. After draining the reservoir, as in step 6, washand rinse the water reservoir.

12. Go thru steps 13-18 to sanitize the ice machinewater system.13. Mix two gallons of sanitizer solution. Use anapproved sanitizer.A possible sanitizer solution may be obtained bymixing two gallons of warm (90-115oF.) potablewater with 1 ounce of household bleach.14. Slowly pour the sanitizer solution into the waterreservoir until the float rises, then switch themaster switch ON.15. As the ice machine uses water from thereservoir, continue to pour the sanitizer solutioninto the reservoir.16. After 1⁄2 of the sanitizer solution has beenadded to the reservoir, and the reservoir is nearlyempty, switch the master switch OFF.17. Drain the reservoir and thoroughly wash theinterior of the reservoir and cover with sanitizersolution.18. Remove the block from the float in the waterreservoir.19. Switch the master switch to ON20. Continue ice making for at least 15 minutes, toflush out any cleaning solution. Switch the masterswitch OFF.

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

21. Remove all ice from the storage bin.22. Add warm water to the ice storage bin andthoroughly wash and rinse all surfaces within thebin.23. Sanitize the bin interior by thoroughly washingthe interior of the bin and bin door with the balanceof the sanitizer solution.24. Switch the master switch ON.25. Replace the panels.

Scotsman Ice MachineCleaner contains acids.These compounds maycause burns.If swallowed, DO NOTinduce vomiting. Give largeamounts of water or milk.Call Physician immediately.In case of external contact,flush with water.Keep out of the reach ofchildren.

NME950 & FME1200

January 1996

1. The bin control uses devices that sense light,therefore they must be kept clean enough so thatthey can ‘‘see’’. At least twice a year, remove thebin 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 probelocated in the water reservoir. At least twice ayear, the probe should be removed from thereservoir, and the tip wiped clean of mineralbuild-up.

3. The bearing in the breaker should also bechecked 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 studInspect the assembly, looking for wear.

See Removal and Replacement to replacebearing or seals. Reverse to reassemble. 4. Check and tighten all bolts and screws.

CLEAN THEWATER LEVEL

PROBE

PULL UP TOREMOVE PROBE

RESERVOIR

///////////////////////////////////////////CAUTION: THE TIP IS

MADE OF GLASS//////////////////////////////////////////

ICE LEVEL SENSORS:SLIDE TO REMOVE

CLEAN THELIGHT SENSORS

MAINTENANCE AND CLEANING

ICE SWEEP

BREAKERCOVER

Electrical shock hazard.Electrical shock can causepersonal injury.Disconnect power beforebeginning to servicecomponents.

NME950 & FME1200

January 1995

5. Clean the air cooled condenser.

The air flow on this model is from front to back, sothe inside of the machine will have to be availableto clean the air cooled condenser. Use a vacuumcleaner or coil cleaner if needed. Do NOT use awire brush.A. Disconnect electrical power, and remove thefilter. The filter may be cleaned or replaced.B. Clean the condenser: the condenser mayappear to be clean on the surface, but it can stillbe clogged internally. Check with a flash light fromthe front to see if light can be seen though thecondenser fins. Reverse to reassemble.

MAINTENANCE: Air Cooled

1. REMOVE TOP PANEL

2. REMOVE TWO SCREWS & UNPLUG FAN MOTORS.

3. PULL FAN MOTOR ASSEMBLY UP AND OUT

4. CLEAN CONDENSER FINS.

TO GAIN ACCESS TO CONDENSER SURFACE:


NME950 & FME1200

January 1995

In some areas, the water supply to the ice makerwill contain a high concentration of minerals, andthat will result in an evaporator and augerbecoming coated with these minerals, requiring amore frequent removal than twice per year. If indoubt about the condition of the evaporator andauger, the auger can be removed so the parts canbe inspected.Note: Water filters can filter out suspended solids,but not dissolved solids. ‘‘Soft’’ water may not bethe complete answer. Check with a watertreatment specialist regarding water treatment.For more information on removal of theseparts, see REMOVAL AND REPLACEMENT.

Turn off the water supply.

1. To remove the auger, remove the front and toppanels.2. Push back bail clamp holding ice chute cover toice chute, and remove cover.3. Unscrew and remove ice sweep.

4. Loosen band clamp under ice chute, andremove ice chute from evaporator. 5. Remove 4 allen screws holding breaker toevaporator.6. Drain the evaporator by lowering and uncappingthe evaporator drain hose.7. Pull up to remove auger.After the auger has been removed, allow the augerto dry: if the auger is not bright and shiny, it mustbe cleaned.Clean the auger and evaporator as required. DONOT HONE THE EVAPORATOR.8. Replace the water seal.9. Reverse to reassemble.

MAINTENANCE AND CLEANING: Auger

ALLENSCREWS

BREAKER &BEARING &

AUGERASSEMBLY

The auger has sharpedges, handle with care.


NME950 & FME1200

January 1995

SERVICE DIAGNOSIS: Symptom Possible Cause Probable CorrectionNo ice is made, nothingoperates

Unit off due to no power Restore PowerUnit off due to master switch inOFF position.

Switch master switch to ON.

Unit off due to low water level. Check water supply, filter,strainer, float valve. Correctwater supply.

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

Check/clean ice level sensors.

Unit off due to scale on waterlevel sensor.

Clean water level sensor.

Unit off due to high pressurecontrol open.

Check for water interruption(water cooled) or fan motorfailure (air cooled).

Auger motor does not turn. Winding open, bearingsseized. Check/replace augermotor.

Low pressure control open Check that auger turnsCheck charge.Check for a restricted system

Centrifugal switch in augermotor does not close.

Check/replace centrifugalswitch.

No power to circuit board,transformer is open.

Replace transformer.

Circuit Board gear motor relaywill not close

Check, replace board

Water level or ice level sensorfailed.

Check, replace sensor

No ice, auger motor is turning Compressor contactor coil isopen

Check/replace contactor

Compressor will not start Check start capacitor.Check start relayCheck compressor windings

Circuit board compressor relaywill not close.

Check, replace board

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

Clean the air filter andcondenser.

Low capacity because theauger and evaporator arecoated with mineral scale

Clean the water system

Low suction pressure due tolow refrigerant charge

Locate leak. Recoverrefrigerant, repair leak, replacedryer, evacuate and weigh inthe nameplate charge

NME950 & FME1200

January 1995

SERVICE DIAGNOSISSymptom Possible Cause Probable CorrectionWater Leak Drain plugged up Clean out drain

Tubing cracked Replace tubingCondensation on drain tubing Insulate tubingHose off Reattach hoseReservoir cover off Return cover to reservoirReservoir cracked Replace reservoirEvaporator water seal leaks Check base of evaporator &

drip pan. If the seal leaks, shutoff the water, remove theauger, replace the water seal.Check gear motor for waterinfiltration.

Excessive water use Water cooled model, waterregulating valve not adjustedproperly.

Adjust to 245 PSIG dischargepressure

Reservoir float valve leaks thru Replace float valve or seatWater cooled model,overcharged with refrigerant

Recover and weigh refrigerant.Weigh in correct charge.

Water cooled model,condenser coated with minerals

Acid clean water cooledcondenser.

Excessive ice meltage Bin drain clogged Clean out bin drain.Improper installation of drains,they are connected.

Drains must be separate.

Poor fit between bin door anddoor frame

Adjust or replace

Machine makes too much noise Evaporator coated internallywith minerals

Clean with Scotsman IceMachine Cleaner

Motor bearings dry Oil or replace motor

NME950 & FME1200

January 1995

WATER RESERVOIR1. Shut off the water supply to the ice maker.2. Remove front panel.3. Remove reservoir cover.4. Disconnect water inlet tube from reservoir inletfitting.5. To remove float valve, push in "locking tabs" asshown and pull float up.Note: The plunger/seat is available separately asa part.6. To remove reservoir, pull up and remove watersensor.8. Disconnect water outlet tubes.9. Remove mounting screws from reservoirbracket, and remove reservoir from ice maker. 10. Reverse to reassemble.

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, infront of and behind it are two plastic bin controlmounts.5. Slide each bin control to the left, and in thecontrol box, disconnect the electrical leadsconnecting the bin control to the circuit board.6. Reverse to reassemble, be certain that the bincontrols are aligned so that the ice level sensorsare visible (centered) through the holes in the icechute.

LOCKINGTABS

FLOATASSEMBLY

PLUNGER/SEAT

ICECHUTE

SLIDE BINCONTROLS IN

AND OUT

REMOVAL AND REPLACEMENT: Water Reservoir & Bin ControlsNME950 & FME1200

January 1995

REMOVAL AND REPLACEMENT: Bearing And BreakerNote: Removal of the auger, water seal,evaporator and gear motor must begin at the topof the assembly.1. Remove panels and disconnect electricalpower.

2. Push back bail clamp and remove ice chutecover.3. Unscrew and remove ice sweep.4. Remove insulation halves from outside of icechute, loosen band clamp under ice chute, lift upand remove ice chute.5. The breaker may be removed from the augerand evaporator without disturbing the auger. a. Unscrew breaker cover from breaker (left handthreads) b. Unscrew auger stud from top of auger.

c. Unscrew 4 allen head cap screws holdingbreaker to evaporator. d. Lift up, and remove breaker/bearing assemblyfrom auger & evaporator.6. Service the bearing. Check for rust, rough spotsand damage. a. The bearing is pressed into the breaker, toremove the bearing and replace it an arbor pressis needed. b. Replace lower seals before installing newbearing in breaker.Note: seals must be pressed in with a tool pushingagainst the outer edge only, they will not install byhand.Replace parts as required. Re-grease bearing withScotsman part no. A29123-001 bearing grease.Replace top seal, and check the o-rings, replace ifcut or torn.7. Reverse to reassemble: specific tools andmaterials are required to install properly.a. Add food grade grease such as Scotsman partnumber 19-0569-01 to the seal area beforeinstalling on the auger.b. Check the seal to shaft areas for cuts, or roughspots: none are permitted.

Note: Flaker parts are shown in this manual.Nugget Breakers do NOT have a Slotted Collar.

AUGER STUD

BEARING

SEALS

SLOTTEDCOLLAR

ICESWEEP

BREAKER COVER

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


NME950 & FME1200

January 1995

To Remove the Auger:Turn off the water to the machine, and unclip theevaporator drain hose, pull it down and drain theevaporator into the bin or a container.1. The top panel must be removed.

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 beremoved as an assembly. a. Unscrew 4 allen head cap screws holding

breaker to evaporator. b. Lift up on breaker and remove auger fromevaporator.Note: If the auger is stuck, the breaker mustbe removed from the auger. The breaker may be removed from the auger andevaporator without disturbing the auger.

a. Unscrew breaker cover from breaker (left handthreads) b. Unscrew auger stud from top of auger. c. Unscrew 4 allen head cap screws holdingbreaker to evaporator. d. Lift up & remove breaker from evaporator. e. If the auger is stuck use a slide hammer typepuller 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 augerare: 1. The auger body. It should be clean andshining. Sometimes an auger will appear cleanwhen wet, but after it is dry it will be seen to bestained. Scrub the auger with ice machine cleanerand hot water.

WARNINGIce machine cleaner is an acid. Handle it withextreme care, keep out of the reach of children.

2. The water seal area. Because the auger hasbeen removed, the water seal will have to bereplaced. Remove the water seal top half from theauger, and inspect the auger for minerals, clean asrequired.

REMOVAL AND REPLACEMENT: Auger

SLIDE HAMMER PULLER

THREAD INTO THEAUGER HERE

BREAKERAND AUGERASSEMBLY

WARNINGThe auger has sharp

edges, handle with care.

Electrical shock hazard.Electrical shock cancause personal injury.Disconnect power beforebeginning to servicecomponents.

NME950 & FME1200

January 1995

To Remove the Water Seal: (Assuming all steps to remove the auger havebeen performed.)1. The gear motor/evaporator assembly will haveto be exposed.2. Remove the 4 hex head cap screws holding theevaporator to the gear motor assembly. Lift theevaporator up and off of the gear motor.3. Remove the snap ring or wire retainer from thegrove 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 pushthe water seal into the bottom of the evaporatorslightly past the grove for the snap ring.2. Replace the snap ring and pull the water sealdown against it.3. The part of the water seal that rotates with theauger must also be replaced. Remove the old partfrom the auger and clean the mounting area.4. Place a small bead of food grade silastic sealant(such as 732 RTV or Scotsman part number19-0529-01) on the area of the auger where thewater seal is to be mounted.

5. Carefully push the water seal (rubber sideagainst the auger shoulder and the silastic.)

CAUTIONDo not get any silastic onto the face of the seal.

6. Allow the auger and seal to air dry until thesilastic is dry on the surface.7. If the original water seal was leaking, it would bea good idea to inspect the interior of the gearmotor.

REMOVAL AND REPLACEMENT: Water Seal

WATER SEAL

RETAININGRING

REMOVAL OF THE WATER SEAL

PLACE FOODGRADE SEALANT

HERE

REPLACING THE WATER SEAL

NME950 & FME1200

January 1995

To Replace the Evaporator:(Assuming all the steps for removal of the thrustbearing, breaker, auger, and water seal have beenperformed.)1. Discharge the refrigerant from the ice maker.2. Unsweat the refrigerant connections: a) At the thermostatic expansion valve outlet.

b) At the suction line at the jointabout 3" from the evaporator.3. Remove the evaporator.4. Unsweat the drier from the liquidline.5. After installing a new water sealin the new evaporator (see "ToReplace the Water Seal") sweat inthe new evaporator at the old tubingconnections.6. Install an new drier in the liquidline.7. Evacuate the system untildehydrated, then weigh in thenameplate charge. Check for leaks.8. Install auger, breaker, breakerbearing assembly, and icedischarge chute in reverse order ofdisassembly.

To Reassemble the Evaporator and Auger1. After the gear motor has been inspected, fastenthe evaporator to the gear motor. Torque the boltsto 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 thedisassembly for the breaker & thrust bearingassembly.

ICE SWEEP

AUGER

EVAPORATOR

BREAKER/DIVIDER

BEARING

ICE CHUTE

REMOVAL AND REPLACEMENT: Evaporator


CAUTIONHeat sink the TXV body when unsweating orresweating the adjacent tubing.

NME950 & FME1200

January 1995

To Remove and Repair the Gear motorAssembly:(Assuming that the procedures through removal ofthe water seal have been performed.)1. Remove the electrical wires from the gear drivemotor.2. Unscrew the 4 cap screws holding the gearmotor 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.

REMOVAL AND REPLACEMENT: Gearmotor


COVER &OUTPUT GEAR

ASSEMBLY

CENTRIFUGALSWITCH

AUGER DRIVE MOTOR

ROTOR BEARING

SEAL

WATER SHED

To Inspect the gear motor.A) Remove the cap screws holding the gear motorcase halves together and pry the two cases apart.B) To lift off the cover, lift up until you can feelinternal contact, then pull the cover towards theoutput gear end, and then lift the cover (with drivemotor attached) up and away from the gear motorcase.Note: The gearcase cover, output gear,bearings and output shaft are a pressedtogether assembly. C) Inspect the oil gears and bearings. If there isevidence of water in the oil (rusty metal, too muchoil, white oil) replace the oil and damaged parts.The oil charge is 14 oz. Do not overfill.Reassemble and bench test the gear motor, checkfor oil leaks, noise, and amp draw.

NME950 & FME1200

January 1995

To Remove the Condenser Fan MotorAssembly1. Remove top panel.2. Unplug the two fan motor wire leads from thefan motors.3. Remove the two hex head bolts from the topend 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 assemblylower flange holes over the two allen head capscrews in the base, and reinstall the hex headbolts at the top of the assembly. Plug the fanmotors back in, and replace the top panel.

REMOVAL AND REPLACEMENT: Fans


NME950 & FME1200

January 1995

REFRIGERATION SYSTEM SERVICEGeneral:

ACCESS VALVE

ALLENWRENCHTorque to6-8 ft. lb..

Cap, Torqueto 8-12 ft. lb..

Cap, Torqueto 7-11 ft. lb..

VAPOR VAPOR TEMP. PRESS. TEMP. PRESS.(DEG F) (PSIG) DEG F) (PSIG)-20 17 70 146-18 18 72 150-16 20 74 155-14 21 76 161-12 23 78 166-10 24 80 171 -8 26 82 177 -6 28 84 182 -4 29 86 188 -2 31 88 194 0 33 90 200 2 35 92 206 4 37 94 212 6 39 96 219 8 41 98 22510 43 100 23212 46 102 23914 48 104 24616 50 106 25318 53 108 26020 55 110 26822 58 112 27524 60 114 28326 63 116 29128 66 118 29930 69 120 30732 72 122 31634 75 124 32436 78 126 33338 81 128 34240 85 130 35142 88 132 36044 91 134 37046 95 136 37948 99 138 38950 102 140 39952 106 142 40954 110 144 42056 114 146 43058 118 148 44160 123 150 45262 127 152 46464 132 154 47566 136 156 48768 141 158 499

Pressure-Temperature Chart for HP62

This ice machine uses R-404A refrigerant and polyolester oil. Do NOTuse 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 isincluded with replacement compressors.

••HP62 is not compatible with mineral oil, so these ice machines usePolyolester oil. Polyolester oil absorbs water very easily. When one ofthese refrigeration systems is opened for service, it must be re-sealedas soon as possible (15 minutes maximum).

••Special leak detection equipment is required to locate small refrigerantleaks. Usually a leak detector capable of detecting a Halongenatedrefrigerant or HFC-134a will work. Check with the leak detectormanufacturer 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 valvewill leak.

NME950 & FME1200

January 1995

LIQUID CHARGING Instructions for R-404AIn preparation for charging, the low side hoseshould have a sight glass, and/or a restrictordevice (such as a "Charge Faster") installed in itfor metering liquid into the low side of the system.

1. After a thorough evacuation to at least 200microns, shut off the manifold valves and switchoff the vacuum pump.2. Place a drum of R-404A onto an electronicscale.3. Attach the charging hose to the drum.4. Open the valve on the drum and purge thecharging hose.5. Zero out the scale.6. Shut the low side access valve at the icemachine.7. Open the discharge manifold valve full open.8. Watch the scale, when the correct charge isshown, shut the manifold valve.Note: If all of the charge will not "go in" thedischarge side:

A. Shut the discharge access valve at the icemachine.

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 isflowing into the system.

E. When the proper charge is indicated on thescale, shut off the manifold valve(s).9. Shut off the valve on the refrigerant drum.10. Re-open the manifold valves until all liquid hasflowed out of the hoses.11. Shut the low side access valve on the icemachine.12. Remove hoses from ice machine and replaceall caps.

Manifold Valve Manifold Valve

Refrigerant Drum Valve

Low SideAccess Valve

High SideAccess Valve

Sight Glass

SCALE

Hose Connection Schematic for Liquid Charging

NME950 & FME1200

January 1995

These procedures require the machine to be connected to the power supply. The voltages of theelectronic circuit are very low, but HIGHER VOLTAGES ARE PRESENT IN THE UNIT. Do not touchanything but the tester while the unit is being checked out. Make all connections to the circuit board withthe 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, butinspection 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, cleanand not obstructed, use the tester as follows:Bin Control Note: All testing is done with theelectrical power on, the master switch on, and allreset switches ‘‘reset’’.1. Unplug ‘‘photo trans’’ and ‘‘LED’’ connectors fromthe circuit board.2. Plug ‘‘photo trans’’ and ‘‘LED’’ connectors fromthe 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 boardshould be replaced.

b. If the light on the tester IS on, move the ‘‘binfull’’ switch to Bin Empty. The light on the testershould go OFF, and the Bin Empty light on thecircuit board should go ON.If the Bin Empty light is ON, wait 10-20 seconds forthe machine to start, if the machine starts, replacethe ice level sensors.If the Bin Empty light does not come ON, thecircuit board should be replaced.

CIRCUIT BOARD TESTING:

PHOTO TRANS

LED

LIGHT GOESON

SWITCH TO‘‘FULL’’

LIGHT GOES ON

LIGHTGOES OFF

SWITCH TO‘‘BIN EMPTY ’’

NME950 & FME1200

January 1995

Water Level1. Unplug ‘‘water sen’’ connector from controlboard.2. Plug ‘‘water sen’’ connector from Scotsmantester into circuit board.

a. Move ‘‘water’’ switch on tester to No Waterposition. The No Water light on the circuit boardshould go ON. If not, replace the circuit board.

b. Move the ‘‘water’’ switch on the tester to theWater position. The No Water light on the boardshould go OFF. If not replace the circuit board. Ifthe light does go off, replace the water level sensor.If the Bin Empty light is ON, wait 10-20 seconds forthe machine to start. The machine should start.

LIGHT ON

WATER SENS

SWITCH TO‘‘NO WATER ’’

CIRCUIT BOARD TESTING:

LIGHT OFF

SWITCH TO‘‘WATER’’

NME950 & FME1200

January 1995

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