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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.
Installation
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
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.
TABLE OF CONTENTS
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The NM950 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.
March, 1989
Page 1
NM950
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Summary of Contents for Scotsman NM950
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Page 1: Table Of Contents
NM950 INTRODUCTION To the owner or user: The service manual you The NM950 is a modular ice system that fits a are reading is intended to provide you, and the variety of Scotsman ice storage bins. maintenance or service technician, with the... -
Page 2: For The Installer
3/4" FPT 4.9" 3/4" FPT 7.46" Installation Limitations: The NM950 is designed to fit the following Scotsman storage bins: This ice system is designed to be installed B590 and extensions (with bin top KBT18) indoors, in a controlled environment: BH800 using bin top KBT15 (one unit). - Page 3 This is not intended of any kind for products manufactured by as a complete resource for water related Scotsman that have been altered in any way, questions, but it does offer these general including the use of any part and/or other...
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Page 4: Location
NM950 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: Two Units On One Bin
NM950 FOR THE INSTALLER: Location DO NOT STACK ANYTHING IN FRONT OF THE MACHINE(S) TWO UNITS ON ONE BIN ALLOW ROOM FOR AIR CIRCULATION AND SERVICE ACCESS March, 1989 Page 5... -
Page 6: For The Plumber
NM950 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 at the back of the cabinet, the drain line copper tubing, connect to the 3/8"... -
Page 7: For The Electrician
NM950 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
NM950 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 can be and mail it to the Scotsman Factory. checked: it should be 30 psig + or - 4 psig. The suction line temperature at the compressor is normally very cold, nearly to the 10. -
Page 10: Component Description
NM950 COMPONENT DESCRIPTION Control Box: Contains the electrical controls Water Level Sensor: Senses if there is water that operate the machine. in the reservoir to make ice out of. Will shut the machine off it there is none. High Pressure Cut Out Switch: A manual... - Page 11 NM950 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 NM950 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
NM950 ELECTRICAL SEQUENCE Refer the wiring diagram as needed. Shut Down consists of: • • The compressor relay opens. • • If the machine is switched off at the master The compressor contactor opens • • switch, but is otherwise ready to go, switching The compressor stops •... -
Page 14: Operation
NM950 OPERATION: Water Water enters the machine through the 3/8" male flare at the rear of the cabinet, goes to a strainer and then to the water reservoir which it enters through the float valve. The water then goes out the bottom of the reservoir tank to the bottom of the evaporator. - Page 15 NM950 OPERATION: Refrigeration Beginning at the compressor, the refrigerant evaporator; warmer evaporators get more 502 is compressed into a high temperature refrigerant and colder evaporators get less. At gas. The discharge line directs this gas to the the evaporator, the refrigerant enters an area condenser.
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Page 16: Maintenance And Cleaning
NM950 MAINTENANCE AND CLEANING ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// A Scotsman Ice System represents a sizable investment of time and money in any company’s business. In order to receive the best return for that investment, it MUST receive periodic maintenance. It is the USER’S RESPONSIBILITY to see that the unit is properly maintained. It is always preferable, and less costly in the long run, to avoid possible down time by keeping it clean;... - Page 17 NM950 MAINTENANCE AND CLEANING ///////////////////////////WARNING///////////////////////////// ICE LEVEL SENSORS: Disconnect electrical power before SLIDE TO REMOVE beginning. ////////////////////////////////////////////////////////////////////////// 1. The bin control uses devices that sense light, therefore they must be kept clean enough so that they can “see”. At least twice a...
- Page 18 NM950 MAINTENANCE: Air Cooled Step 3. Pull fan motor assembly off of locating ///////////////////////////WARNING///////////////////////////// pins and out of the unit. Disconnect electrical power before beginning. ////////////////////////////////////////////////////////////////////////// 5. Clean the air cooled condenser. The air flow on this model is from front to...
- Page 19 NM950 MAINTENANCE AND CLEANING: Auger In some areas, the water supply to the ice maker will contain a high concentration of minerals, and that will result in an evaporator ALLEN and auger becoming coated with these SCREWS minerals, requiring a more frequent removal /////////////WARNING/////////////// than twice per year.
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Page 20: Service Diagnosis
NM950 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 NM950 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 NM950 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
NM950 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
NM950 REMOVAL AND REPLACEMENT: Auger //////////////////////////////WARNING////////////////////////// c. Unscrew 4 allen head cap screws holding breaker to evaporator. Disconnect Electrical Power. d. Lift up & remove breaker from evaporator. ///////////////////////////////////////////////////////////////////////// e. If the auger is stuck use a slide hammer To Remove the Auger:... -
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
NM950 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
NM950 REMOVAL AND REPLACEMENT: Gearmotor Note: The gears and bearings are available //////////////////////////////WARNING//////////////////////////// only as pressed together sets. Disconnect Electrical Power Before Begining Removal Procedures. D) After replacing parts as required, (if any) reassemble the gearcase. The two smaller ///////////////////////////////////////////////////////////////////////////... -
Page 30: Fan Motor Assembly
NM950 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 31: Electronic Tester
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.
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