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Scotsman NS650, User Manual

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Scotsman NS650 User Manual Download Page 27

ICE SWEEP

AUGER

EVAPORATOR

BREAKER

BEARING

WATER

SEAL

RETAINING

RING

DRIP PAN

GASKET

WATER SHED

GEARMOTOR

ASSEMBLY

SEAL(S)

O-RING

CAP SCREW

O-RING

WATER

SHED

LIP SEAL

BREAKER

COVER

O-RING

AUGER STUD

THRUST

WASHER

REMOVAL AND REPLACEMENT: Evaporator

NS650

December, 1988

Page 27

Summary of Contents for NS650

Page 1: ...toring ice and water level a thermostatic expansion valve and R 502 as the refrigerant TABLE OF CONTENTS Installation For the Installer Specifications 2 Location 3 For the Plumber 4 For the Electrician 5 Final Check List 6 Start Up 7 Component Description 8 Electrical Sequence 11 Operation 12 Maintenance and Cleaning 14 Service Diagnosis 17 Removal and Replacement Reservoir and Bin Controls 21 Sli...

Page 2: ...x D 37 5 x 38 06 x 29 5 same Basic Electrical 115 60 1 same Ice Type NUGGET same Condenser Type Air Water Minimum Circuit Ampacity 25 20 Comp H P 3 4 3 4 Max Fuse Size 35 30 The normal finish for the ice machine is enamel sandalwood A stainless steel panel kit SPKNS650 may be field installed to convert the unit to a stainless steel finish Note Minimum Circuit Ampacity is used to determine wire siz...

Page 3: ...icrons or smaller The finer the filter the better but finer filters will clog sooner than course ones It may be necessary to add a course filter ahead of the fine filter to prolong filter life 2 Check with a water treatment specialist for a water test and recommendations regarding filters and treatment Legs The legs when used may now be installed Either use a mechanical lift to hoist the cabinet h...

Page 4: ...e to control it It is connected to a 3 8 FPT condenser inlet at the back of the cabinet The water pressure to all lines must always be above 20 psig and below 120 psig Drains Air Cooled Models There are two 3 4 FPT drains at the back of the cabinet Drain lines are of the gravity type and 1 4 inch per foot fall is an acceptable pitch for the drain tubing There should be a vent at the highest point ...

Page 5: ...y 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 insta...

Page 6: ... Have all the plumbing connections been made and checked for leaks 4 Has the machine been leveled 5 Is there a minimum of 6 clearance at the back and left sideof the machine for proper service access and air circulation air cooled 6 Is the water pressure a minimum of 20 psig 7 Is the unit grounded 8 Is there clearance over the top of the machine for service access 9 Is there a water shut off valve...

Page 7: ...ll open and warm water will be discharged into the drain 5 The unit should soon be making ice if desired the low side pressure can be checked it should be 30 psig or 4 psig The suction line temperature at the compressor is normally very cold nearly to the point of frost up to the compressor body but not on it The air cooled discharge pressure will depend upon air and water temperatures but should ...

Page 8: ...f 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 C...

Page 9: ...t board 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 Reset Switch Part of Circuit Board manual reset Lights up when unit shuts off from ice discharge chute be...

Page 10: ...here the two seal faces meet Ice Sweep A plastic cap with fingers It revolves with the auger to sweep the ice into the ice chute Breaker Where the ice is compressed and much of the extra water is squeezed out of it before it is discharged into the bin Motor A permanent split capacitor motor that drives the gear reducer Thrust Bearing As the ice is pushed up the evaporator the auger is thrust down ...

Page 11: ...er 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 mach...

Page 12: ...vaporator 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 The storage bin has a separate drain tube and drain fitting ADJUSTMENT OF WATER LEVEL EVAPORATOR DRAIN WATER LEVEL ICE CHUTE D...

Page 13: ... 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 pressur...

Page 14: ...ic and Hydroxyacetic acids These compounds are corrosive and 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 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 11...

Page 15: ...uildup 3 The bearing in the breaker should also be checked at least two times per year A Check the bearing by removing the ice chute cover unscrewing the ice sweep removing the water shed using a spanner wrench and unscrewing the breaker cover unscrewing the auger stud Inspect the assembly looking for wear See Removal and Replacement to replace bearing or seals Reverse to reassemble 4 Check and ti...

Page 16: ...hex studs holding ice chute cover to ice chute and remove cover 4 Unscrew and remove ice sweep 5 Loosen band clamp under ice chute and remove ice chute from evaporator 6 Remove 4 allen screws holding breaker to evaporator 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 requir...

Page 17: ... E Check the high pressure cut out if closed go to F if open check 1 The pressure control opens at 450 psig Check the high side pressure reset the control and observe on water cooled that water soon begins to flow from the condenser drain or on air cooled that the fan is forcing air through the condenser If the unit trips out on pressures below 450 psig replace the control If the pressures rise ab...

Page 18: ...n full light on the tester should be ON if not replace the circuit board If the bin full light on the tester is ON move the tester switch to bin empty the light on the tester should go OFF and the bin empty light on the circuit board should go ON If not replace the circuit board If it does as above and the machine still does not run replace the ice level sensors 3 If the transformer is fine and th...

Page 19: ...oil is open replace the contactor 3 Check the auger drive motor centrifugal switch If when the drive motor is running contact 4 black wire removed has no power and all of the above switches have been checked replace the centrifugal switch or the drive motor 4 If the compressor relay on the circuit board has power on the NO contact but not on the COM contact replace the circuit board B Check the co...

Page 20: ...ter leaks replace the water seal if found to be leaking 3 Check the low side pressure normal is about 30 psig If low assume a refrigerant leak locate repair and recharge If no leak the TXV may be restricted defective or not adjusted properly If needed replace the TXV evacuate and recharge per nameplate 4 Check the insulation on the evaporator It should be dry with no wet spots or frost If the insu...

Page 21: ...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 in front of and behind it are two plastic bin control mounts 5 Pull each bin control ice level sensor out of the rubber mounting grommets and in the control box disconnect the electrical leads connecting the bin control to the circuit b...

Page 22: ...r is OFF and disconnect the spout switch leads from the spout switch 5 Pull up and remove the ice level sensors from the ice chute 6 Unscrew three hex studs and remove the ice chute cover 7 Unscrew the ice sweep and remove it 8 Loosen the band clamp under the ice chute and lift up and remove the ice chute from the evaporator 9 Disconnect drain system from reservoir and drip pan 10 Remove control b...

Page 23: ...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 on...

Page 24: ...ger 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 ...

Page 25: ... 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 5 Carefully push the water seal rubber side against the auge...

Page 26: ...ate the system until dehydrated then weigh in the nameplate charge Check for leaks 8 Install auger breaker breaker bearing assembly and ice discharge chute in reverse order of disassembly See To Reassemble Evaporator and Auger To Reassemble the Evaporator and Auger 1 After the gearmotor has been inspected fasten the evaporator to the gear motor be sure that the number of shims indicated on the gea...

Page 27: ...EARING WATER SEAL RETAINING RING DRIP PAN GASKET WATER SHED GEARMOTOR ASSEMBLY SEAL S O RING CAP SCREW O RING WATER SHED LIP SEAL BREAKER COVER O RING AUGER STUD THRUST WASHER REMOVAL AND REPLACEMENT Evaporator NS650 December 1988 Page 27 ...

Page 28: ...ENT Gearmotor COVER OUTPUT GEAR ASSEMBLY GEAR CASE CENTRIFUGAL SWITCH AUGER DRIVE MOTOR ROTOR BEARING SEAL WATER SHED SEAL WARNING Disconnect Electrical Power Before Begining Removal Procedures NS650 December 1988 Page 28 ...

Page 29: ...g E After the case is together and the locating pins are secure in both ends replace all cap screws Note If the gearcase cover was replaced the replacement part was shipped with a certain number of shims The number of shims used must match the number on the gearcase cover Do not use the old shims unless there is a shortage Bench test the gearmotor check for oil leaks noise and amp draw REMOVAL AND...

Page 30: ...ile 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 swit...

Page 31: ...oard 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 ON WATER SENS SWITCH TO NO WATER LIGHT OFF SWITCH ...

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