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FOR THE INSTALLER: Location

TWO UNITS ON ONE BIN

ALLOW ROOM

FOR AIR

CIRCULATION
AND SERVICE

ACCESS

DO NOT STACK ANYTHING IN

FRONT OF THE MACHINE(S)

NM650

January, 1991

Page 5

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Summary of Contents for NM650

Page 1: ...ice and water level a thermostatic expansion valve and R 502 as the refrigerant TABLE OF CONTENTS Installation For the Installer Specifications 2 Location 4 Two units on one bin 5 For the Plumber 6 Fo...

Page 2: ...umber NM650AE 1A NM650WE 1A NM650AE 32A NM650WE 32A Diminsions w o bin H X W X D 27 x 21 x 24 same same same Basic Electrical 115 60 1 same 208 230 60 1 same Ice Type NUGGET same same same Condenser T...

Page 3: ...es the water used to make ice should be filtered or treated depending upon the water There is no one type of water filter that is effective in all situations That is why a water test is important Note...

Page 4: ...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...

Page 5: ...FOR THE INSTALLER Location TWO UNITS ON ONE BIN ALLOW ROOM FOR AIR CIRCULATION AND SERVICE ACCESS DO NOT STACK ANYTHING IN FRONT OF THE MACHINE S NM650 January 1991 Page 5...

Page 6: ...cabinet The water pressure to all lines must always be above 20 psig and below 120 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...

Page 7: ...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 limi...

Page 8: ...late 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 s...

Page 9: ...valve will 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 te...

Page 10: ...make ice out of Will shut the machine off it there is no water Ice Discharge Chute Directs the ice produced by the evaporator into the storage bin Ice Level Sensor An electronic eye it senses the pre...

Page 11: ...of ice when the unit turns off and for the compressor Early models before late 1990 production had a reset switch is mounted on the circuit board Transformer Supplies low voltage to the circuit board...

Page 12: ...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 sque...

Page 13: ...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 A...

Page 14: ...e 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 rea...

Page 15: ...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...

Page 16: ...sphoric 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...

Page 17: ...buildup 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 spa...

Page 18: ...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 clo...

Page 19: ...1 To remove the auger remove the front and top panels 2 Remove 3 hex studs holding ice chute cover to ice chute and remove cover 3 Unscrew and remove ice sweep 4 Loosen band clamp under ice chute and...

Page 20: ...r evacuate and weigh in the nameplate charge E Check the high pressure cut out if closed go to F if open check 1 The pressure control opens at 400 psig Check the high side pressure reset the control a...

Page 21: ...elf the ice level sensors should be replaced 3 If the transformer is fine and the no water light is ON check the water level sensor a Check the water level in the reservoir restore if low If the water...

Page 22: ...il 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 c...

Page 23: ...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 rest...

Page 24: ...emaker 8 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 in front of and...

Page 25: ...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 d...

Page 26: ...r 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...

Page 27: ...n 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 s...

Page 28: ...ated 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...

Page 29: ...rings They are likely to be fine if the oil is If there is evidence of water in the oil rusty bearings and gears the oil having a creamy white appearance oil level too high carefully inspect the beari...

Page 30: ...hat 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 s...

Page 31: ...ot 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...

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