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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
Refrigeration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Electronic Tester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Parts lists and wiring diagrams are in the center of this manual, printed on yellow paper.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
The NM1852 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-22 as the
refrigerant.
August 1993
Page 1
NM1852
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Table of Contents
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Summary of Contents for Scotsman NM1852
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Page 1: Table Of Contents
Electronic Tester ........32 Parts lists and wiring diagrams are in the center of this manual, printed on yellow paper. The NM1852 is a modular ice system that fits a variety of Scotsman ice storage bins. -
Page 2: For The Installer
NM1852 FOR THE INSTALLER The NM1852 is designed to fit the following Scotsman storage bins: B90 and extensions (with bin top KBT18) BH800 no bin top required. BH900 using bin top KBT14. BH1360, no bin top required. When installing a new system,... - Page 3 They meet or exceed the standards of UL, NSF, and CSA. Scotsman assumes no liability or responsibility of any kind for products manufactured by Scotsman that have been altered in any way, including the...
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Page 4: Storage Bin
NM1852 FOR THE INSTALLER Typical Storage Bin with Extension and Bin Top Location: 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 NM1852 FOR THE INSTALLER: Location ALLOW ROOM FOR AIR DO NOT STACK ANYTHING IN CIRCULATION FRONT OF THE MACHINE(S) AND SERVICE ACCESS August 1993 Page 5...
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Page 6: For The Plumber
NM1852 FOR THE PLUMBER CONFORM TO ALL APPLICABLE CODES Water Inlet Air Cooled Models: The recommended water supply is clean, cold water. Use 3/8" O.D. copper tubing, and connect to the single 3/8" male flare at the back of the cabinet. This connection supplies water to both ice making systems. -
Page 7: For The Electrician
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 installation. August 1993 Page 7 NM1852 POWER SUPPLY... -
Page 8: Final Check List
NM1852 FOR THE INSTALLER 1. Is the ice system installed indoors in a location where the air and water temperatures are controlled, and where they do not exceed the design limitations? 2. Is there an electrical service disconnect within sight of the installed machine? Has the voltage... -
Page 9: Start Up
9. Fill out the manufacturers registration card, and mail it to the Scotsman Factory. 10. Fill out the field quality audit form, and mail it to the Scotsman factory. -
Page 10: Component Description
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. There are two of each of the above components in the NM1852. WATER COOLED COMPRESSOR Ice Discharge Chute: Directs the ice produced by the evaporator into the storage bin. - Page 11 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.
- Page 12 NM1852 COMPONENT DESCRIPTION Evaporator: A refrigerated vertical tube filled with water 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 the evaporator. Water Seal: A two part "face" seal, the top half rotating with the auger, the bottom half stationary, the sealing action being where the two seal "faces"...
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Page 13: Electrical Sequence
If the spout switch opens, the machine will stop immediately (through the relays on the circuit board). The spout switch must be manually reset. Each master switch is the manual control for each system, but it is not a service disconnect. August 1993 Page 13 NM1852... -
Page 14: Operation
NM1852 OPERATION: Water WATER INLET DRAIN CHUTE 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. - Page 15 Refrigeration Schematic DISCHARGE LINE THERMOSTATIC EXPANSION VALVE COMPRESSOR August 1993 Page 15 NM1852 SUCTION LINE EVAPORATOR GEAR MOTOR...
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Page 16: Maintenance And Cleaning
NM1852 MAINTENANCE AND CLEANING The NM1852 is made up of two separate ice makers; to properly clean and maintain the NM1852, 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 MAINTENANCE AND CLEANING The NM1852 is made up of two separate ice makers; to properly clean and maintain the NM1852, these steps must be followed for both systems. ///////////////////////////WARNING///////////////////////////// Disconnect electrical power before beginning. ////////////////////////////////////////////////////////////////////////// 1. The bin control uses devices that sense light, therefore they must be kept clean enough so that they can “see”.
- Page 18 NM1852 MAINTENANCE: Air Cooled 5. Clean each air cooled condenser. Use a vacuum cleaner or coil cleaner if needed. Do NOT use a wire brush. ////////////////////////////WARNING/////////////////////////////// Disconnect electrical power. ///////////////////////////////////////////////////////////////////////////// A. Remove top panel. PANEL B. Remove two screws, and unplug the fan motors.
- Page 19 Clean the auger and evaporator as required. DO NOT HONE THE EVAPORATOR. 8. Replace the water seal. 9. Reverse to reassemble. August 1993 Page 19 NM1852 ALLEN SCREWS BREAKER & BEARING & AUGER ASSEMBLY...
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Page 20: Service Diagnosis
NM1852 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, (spout switch, 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 Tester Model NM1 into the circuit board.
- Page 22 NM1852 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 NM1852 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: Water Reservoir & Bin Controls
NM1852 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
7. Reverse to reassemble: specific tools and materials are required to install properly. a. Add food grade grease such as Scotsman part number 19-0569-01 to the seal area before installing on the auger. b. Check the seal to shaft areas for cuts, or rough spots: none are permitted. -
Page 26: Auger
Scrub the auger with ice machine cleaner and hot water. ///////////////////////////WARNING////////////////////////////// Ice machine cleaner is an acid. Handle it with extreme care, keep out of the reach of children. ////////////////////////////////////////////////////////////////////////// 2. The water seal area. Because the auger has been removed, the water seal will have to be replaced. -
Page 27: Water Seal
REPLACING THE WATER SEAL 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. -
Page 28: Evaporator
NM1852 REMOVAL AND REPLACEMENT: Evaporator WARNING Disconnect electrical power before beginning removal procedures. To Replace the Evaporator: (Assuming all the steps for removal of the thrust bearing, breaker, auger, and water seal have been performed.) 1. Discharge the refrigerant from the ice maker. -
Page 29: Gearmotor
/////////////////////////////////////////////////////////////////////////// WATER SHED SEAL COVER & OUTPUT GEAR ASSEMBLY Note: There are two gearmotors in each NM1852 CENTRIFUGAL SWITCH AUGER DRIVE MOTOR 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
NM1852 REMOVAL AND REPLACEMENT Removing Condenser Fan Motor Assembly /////////////////////////////WARNING////////////////////////// Disconnect all electrical power to the machine before beginning. ///////////////////////////////////////////////////////////////////////// 1. Remove the top panel. 2. Unplug the two fan motor wire leads from the fan motors. 3. Remove two hex head bolts from top end of fan motor assembly, (see the illustration). -
Page 31: Refrigeration
There are various mechanical devices that may be used to recycle refrigerant at the field level, however, Scotsman requires that any refrigerant placed into a Scotsman ice machine meet ARI spec 700-88. Reclaim programs are available through most refrigerant wholesalers. -
Page 32: Electronic Tester
2. Plug “photo trans” and “LED” connectors from the tester into the circuit board. 3. Unplug “water sen” connector from control board. 4. Plug “water sen” connector from Scotsman tester into circuit board. Bin Level a. Move the “bin full” switch on the tester to Full.