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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.
TABLE OF CONTENTS
Installation
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
Reservoir and Bin Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Bearing and Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
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.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
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.
May, 1989
Page 1
NM1850
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Summary of Contents for Scotsman NM1850
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Page 1: Table Of Contents
NM1850 INTRODUCTION To the owner or user: The service manual you The NM1850 is a modular ice system that fits are reading is intended to provide you, and the a variety of Scotsman ice storage bins. maintenance or service technician, with the... -
Page 2: For The Installer
NM1850 FOR THE INSTALLER BACK VIEW The NM1850 is designed to fit the following Scotsman Condenser Inlet (W/C): storage bins: 3/8" FPT B590 and extensions (with bin top KBT18) BH800 no bin top required. BH1000 using bin top KBT14. 5.25"... - Page 3 Scotsman assumes no liability or responsibility Air Temperature of any kind for products manufactured by Water Temperature 40 Scotsman that have been altered in any way, Water Pressure 20 PSI 80 PSI including the use of any part and/or other...
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Page 4: Storage Bin
NM1850 FOR THE INSTALLER Location: Typical Storage Bin with Extension and Bin Top 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"... - Page 5 NM1850 FOR THE INSTALLER: Location ALLOW ROOM FOR AIR DO NOT STACK ANYTHING IN CIRCULATION FRONT OF THE MACHINE(S) AND SERVICE ACCESS May, 1989 Page 5...
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Page 6: For The Plumber
NM1850 FOR THE PLUMBER CONFORM TO ALL APPLICABLE CODES Water Inlet Drains Air Cooled Models: The recommended water Air Cooled Models: There is one 3/4" FPT supply is clean, cold water. Use 3/8" O.D. drain for both ice making systems at the back copper tubing, and connect to the single 3/8"... -
Page 7: For The Electrician
NM1850 FOR THE ELECTRICIAN CONFORM TO ALL APPLICABLE CODES The electrical power to the unit is supplied fused. Voltage variation must remain within through the junction box at the rear of the design limitations, even under starting machine. conditions. Check the nameplate (located on the back... -
Page 8: Final Check List
NM1850 FOR THE INSTALLER Final Check List 1. Is the ice system installed indoors in a 5. Is there a minimum of 6" clearance at the location where the air and water temperatures back of the machine for proper service access... -
Page 9: Start Up
5. The unit should soon be making ice, if 9. Fill out the manufacturers registration card, desired, the low side pressure of each system and mail it to the Scotsman Factory. can be checked: it should be 30 psig + or - 4 psig. -
Page 10: Component Description
Expansion valve: The refrigerant metering level, it also contains the water level sensor. device. There are two of each of the above components in the NM1850. WATER EXPANSION COOLED VALVES... - Page 11 NM1850 COMPONENT DESCRIPTION: Control Box Contactor: A definite purpose contactor Low Pressure Cut Out Switch: A manual connecting the compressor and the remote reset control that shuts off the ice machine condenser fan motor to the power supply. when the low side pressure drops below a preset point, 0-4 psig.
- Page 12 NM1850 COMPONENT DESCRIPTION Evaporator: A refrigerated vertical tube filled Breaker (Divider): Where the ice is with water and containing a water seal and compressed and much of the extra water is auger. squeezed out of it before it is discharged into the bin.
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Page 13: Electrical Sequence
NM1850 ELECTRICAL SEQUENCE Refer the wiring diagram as needed. Shut Down consists of: • • The following description applies to either one The compressor relay opens. • • of the two ice making systems. They operate The compressor contactor opens •... -
Page 14: Operation
NM1850 OPERATION: Water Water enters the machine through the 3/8" male flare at the rear of the cabinet, splits into two separate lines, flows to a strainer at each reservoir and then to each water reservoir which it enters through the float valve. The... - Page 15 NM1850 OPERATION: Refrigeration The following description applies to each of the two separate ice making systems. Beginning at the compressor, the refrigerant At the evaporator, the refrigerant enters an 502 is compressed into a high temperature area of relatively low pressure, where it can gas.
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Page 16: Maintenance And Cleaning
NM1850 MAINTENANCE AND CLEANING The NM1850 is made up of two separate ice makers; to properly clean and maintain the NM1850, these steps must be followed for both systems. ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// A Scotsman Ice System represents a sizable investment of time and money in any company’s business. - Page 17 NM1850 MAINTENANCE AND CLEANING The NM1850 is made up of two separate ice makers; to properly clean and maintain the NM1850, these steps must be followed for both systems. ICE LEVEL SENSORS: ///////////////////////////WARNING///////////////////////////// SLIDE TO REMOVE Disconnect electrical power before beginning.
- Page 18 NM1850 MAINTENANCE: Air Cooled 5. Clean each air cooled condenser. Use a FAN MOTOR vacuum cleaner or coil cleaner if needed. Do NOT ASSEMBLY use a wire brush. ////////////////////////////WARNING/////////////////////////////// Disconnect electrical power. ///////////////////////////////////////////////////////////////////////////// A. Remove top panel. PANEL C. Pull fan motor assembly off of locating pins and out of the unit.
- Page 19 NM1850 MAINTENANCE AND CLEANING: Auger In some areas the water supply to the icemaker will have a great deal of minerals in it, and that will result in an evaporator and ALLEN auger becoming coated with these minerals, SCREWS requiring a more frequent removal than twice per year.
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Page 20: Service Diagnosis
NM1850 SERVICE DIAGNOSIS: Condition - No Ice Being Produced STATUS: NOTHING OPERATES A. Check: Voltage to the unit, restore it if there is none. Compare to the nameplate. B. Check: The master switch, switch ON if off. C. Check: The 3 reset switches, (circuit board, high and low pressure): depress and release each switch. - Page 21 If the bin empty light is still OFF, check the circuit board. 1. Unplug “opto trans” and “LED” connectors from the circuit board. 2. Plug “opto trans” and “LED” connectors from the Scotsman Electronic Control Testor Model NM1 into the circiut board.
- Page 22 NM1850 SERVICE DIAGNOSIS: Condition - No Ice Produced STATUS: GEARMOTOR OPERATES, COMPRESSOR DOES NOT A. Check the compressor relay. The relay is on the circuit board, if it does not supply power to the contactor coil, the compressor will not run.
- Page 23 NM1850 SERVICE DIAGNOSIS: Condition - Low Ice Production STATUS: EVERYTHING IS OPERATING A. Check the air cooled condenser for dirt. Clean as required. Check the head pressure on water cooled. Adjust as required. If the head pressure is very high: 1.
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Page 24: Removal And Replacement
NM1850 REMOVAL AND REPLACEMENT: Water Reservoir & Bin Controls WATER RESERVOIR 1. Shut off the water supply to the icemaker. 2. Remove front panel and reservoir cover. 3. To remove float only, pry the mounting flanges apart enough to lift one float pivot pin out of the flange hole, and pull float up and out of the reservoir. -
Page 25: Bearing And Breaker
5. The breaker may be removed from the a. Add food grade grease such as Scotsman auger and evaporator without disturbing the part number 19-0569-01 to the seal area auger. -
Page 26: Auger
NM1850 REMOVAL AND REPLACEMENT: Auger //////////////////////////////WARNING//////////////////////////// d. Lift up & remove breaker from evaporator. Disconnect electrical power. e. If the auger is stuck use a slide hammer type puller to pull on the auger at the threaded Use care when removing the auger: it has hole. -
Page 27: Water Seal
GRADE SEALANT HERE 4. Place a small bead of food grade silastic WATER SEAL sealant (such as 732 RTV or Scotsman part number 19-0529-01) on the area of the auger RETAINING where the water seal is to be mounted. RING 5. -
Page 28: Evaporator
NM1850 REMOVAL AND REPLACEMENT: Evaporator ///////////////////////////////////////////////////////////////////////////WARNING////////////////////////////// ////////////////////////////////// Disconnect electrical power before begining removal procedures. ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// To Replace the Evaporator: To Reassemble the Evaporator and Auger (Assuming all the steps for removal of the 1. After the gearmotor has been inspected,... -
Page 29: Gearmotor
NM1850 REMOVAL AND REPLACEMENT: Gearmotor //////////////////////////////WARNING//////////////////////////// Disconnect Electrical Power Before Begining Removal Procedures. /////////////////////////////////////////////////////////////////////////// CENTRIFUGAL WATER SHED SWITCH SEAL AUGER DRIVE MOTOR COVER & OUTPUT GEAR ASSEMBLY ROTOR BEARING SEAL To Remove and Repair the Gearmotor Assembly: (Assuming that the procedures through removal of the water seal have been performed.) -
Page 30: Fan Motor Assembly
NM1850 REMOVAL AND REPLACEMENT CAP SCREWS Note: The gearcase cover, output gear, LOCATING bearings and output shaft are a pressed PINS together assembly. Replace as a unit. C) Inspect the oil, gears, and bearings. If the oil level and condition is acceptable, quickly check the gears and bearings. -
Page 31: Electronic Tester
NM1850 CIRCUIT BOARD TESTING ///////////////////////////////////////////////////////////////////////WARNING////////////////////////////////////////////////////////////////// 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. - Page 32 OFF. If not replace the circuit board. board. If the light does go off, replace the 2. Plug “water sen” connector from Scotsman water level sensor. tester into circuit board. If the Bin Empty light is ON, wait 10-20 a.