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INTRODUCTION

To the owner or user: The service manual you
are reading is intended to provide you, and the
maintenance or service technician, with the
information needed to install, start up, clean,
maintain, and service this ice system.
This product contains 2 separate ice making
systems in one cabinet.

The NM1850 is a modular ice system that fits
a variety 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 water level; a thermostatic expansion
valve; and R-502 as the refrigerant.

TABLE OF CONTENTS

Installation

For the Installer

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

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

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

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

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

Final Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Component Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Electrical Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Maintenance and Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Service Diagnosis

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Removal and Replacement

Reservoir and Bin Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Bearing and Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Gearmotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

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

Electronic Tester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Parts lists and wiring diagrams are in the center of this manual, printed on yellow paper.

NM1850

May, 1989

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Содержание NM1850

Страница 1: ...rol an electronic circuit for monitoring ice and water level a thermostatic expansion valve and R 502 as the refrigerant TABLE OF CONTENTS Installation For the Installer Specifications 2 Storage Bin 4 Location 5 For the Plumber 6 For the Electrician 7 Final Check List 8 Start Up 9 Component Description 10 Electrical Sequence 13 Operation 14 Maintenance and Cleaning 16 Service Diagnosis 20 Removal ...

Страница 2: ...ce Type NUGGET same same same Condenser Type Air Water Air Water Minimum Circuit Ampacity 16 2 14 9 14 5 12 8 Max Fuse Size 25 20 20 20 Comp H P 1 5 x 2 1 5 x 2 1 5 x 2 1 5 x 2 The normal finish for the ice machine is enamel sandalwood A stainless steel panel kit SPKFM42 may be field installed to convert the unit to a stainless steel finish Note Minimum Circuit Ampacity is used to determine wire s...

Страница 3: ...a water test and recommendations regarding filters and treatment 2 In most cases the water used to make ice should be filtered or treated depending upon the water There is no one type of water filter that will be effective in all situations That is why a water test is important Scotsman Ice Systems are designed and manufactured with the highest regard for safety and performance They meet or exceed...

Страница 4: ... 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...

Страница 5: ...FOR THE INSTALLER Location ALLOW ROOM FOR AIR CIRCULATION AND SERVICE ACCESS DO NOT STACK ANYTHING IN FRONT OF THE MACHINE S NM1850 May 1989 Page 5 ...

Страница 6: ...er cooled condensers 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 for both ice making systems at the back of the cabinet the drain line is of the gravity type and 1 4 inch per foot fall is an acceptable pitch for the drain tubing There should be a vent at the highest point of the drain line and the ideal drain r...

Страница 7: ...he 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 installa...

Страница 8: ...eplate requirements 3 Have all the plumbing connections been made and checked for leaks 4 Has the machine and bin been leveled 5 Is there a minimum of 6 clearance at the back of the machine for proper service access and air circulation 6 Is the water pressure a minimum of 20 psig 7 Has the machine been secured to the bin 8 Is there clearance above the top of the machine for service access 9 Is the...

Страница 9: ...rged into the drain 5 The unit should soon be making ice if desired the low side pressure of each system 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 be between 200 psig an...

Страница 10: ...onstant 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 ...

Страница 11: ...the circuit 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 discharg...

Страница 12: ...he 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 permanent split capacitor motor that drives the gear reducer Thrust Bearing As the ice is pushed up the evaporator the auger is thrust dow...

Страница 13: ... 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 mac...

Страница 14: ...ttom of each evaporator Reservoir overflow or evaporator condensation is routed to the drain Water cooled models have a separate water circuit for the cooling water it enters the fitting at the rear divides and goes to the two water regulating valves then through each water cooled condenser reconnects into one drain and down the drain ADJUSTMENT OF WATER LEVEL EVAPORATOR DRAIN WATER LEVEL EVAPORAT...

Страница 15: ...armer 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 bac...

Страница 16: ...se 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 90 115 degrees F 8 Slowly pour the cleaning solution into the water reser...

Страница 17: ...st 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 tighten all bolts and screws CLEAN THE WATER LEVEL PROBE PULL UP TO...

Страница 18: ...of locating pins and out of the unit B Remove two screws and unplug the fan motors D Clean the condenser reassemble by placing the fan motor assembly onto the loacting pins replacing the mounting screws plugging the fan motors back in and replacing the top panel Reconnect power TOP PANEL FAN MOTOR ASSEMBLY CAP SCREW LOCATING PINS UNPLUG LEADS MAINTENANCE Air Cooled NM1850 May 1989 Page 18 ...

Страница 19: ...ut off electrical power and water supply 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 remove ice chute from evaporator 5 Remove 4 allen screws holding breaker to evaporator 6 Drain the evaporator by pulling down and uncaping the evaporator drain...

Страница 20: ...igh 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 above the trip o...

Страница 21: ...bin full light on the tester should be ON if not replace the circuit board If the bin full light on the tester is ON move the tester switch to bin empty the light on the tester should go OFF and the bin empty light on the circuit board should go ON If not replace the circuit board If it does as above and the machine still does not run replace the ice level sensors 3 If the transformer is fine and ...

Страница 22: ... coil is open replace the contactor 3 Check the auger drive motor centrifugal switch If when the drive motor is running contact 4 black wire removed has no power and all of the above switches have been checked replace the centrifugal switch or the drive motor 4 If the compressor relay on the circuit board has power on the NO contact but not on the COM contact replace the circuit board B Check the ...

Страница 23: ...water 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 in...

Страница 24: ...icemaker 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 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 ...

Страница 25: ...ding 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 ...

Страница 26: ... 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 shinin...

Страница 27: ...own 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 auger shoulder and th...

Страница 28: ...drated 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 gear case cover is in place ...

Страница 29: ...d 1 Remove the electrical wires from the gear drive motor 2 Unscrew the 4 cap screws holding the gearmotor to the base of the machine 3 Remove the gearmotor from the icemaker Bench test the gearmotor check for oil leaks noise and amp draw To Inspect the gearmotor A Remove the cap screws holding the gearmotor case halves together and pry the two cases apart B To lift off the cover lift up until you...

Страница 30: ...ase is together and the locating pins are secure in both ends replace all cap screws Note If the gearcase cover or the gearmotor was replaced the replacement part MAY HAVE BEEN shipped with a certain number of shims The number of shims used must match the number written on the gearcase cover If there is no number written on the cover and no shims were received with the new part do not use any shim...

Страница 31: ...s 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...

Страница 32: ... 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 CIRCUIT BOARD TESTING LIGHT OFF SWITC...

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