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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 maker-dispenser.
The ND650 is a combination nugget ice maker and
countertop dispenser, with the option of wall
mounting. A water station is standard.
The ND650 ice making section is equipped with
the following features: electronic controls for bin
TABLE OF CONTENTS
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Environmental Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Wall Mount Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Soda Valve Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Final Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
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Electrical Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Maintenance and Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Breaker and Bearing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Evaporator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Gearmotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Electronic Tester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Parts Lists and Wiring Diagrams are printed on yellow paper in the center of this manual.
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level and low water; thermostatic expansion valve;
front service for most components; and R502
refrigerant. The ice dispensing section is a
seamless plastic storage bin, with a stainless steel
ice agitator at the bottom to sweep the ice into the
dispensing chute.
March, 1989
Page 1
ND650
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Summary of Contents for Scotsman ND650
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Page 1: Table Of Contents
The ND650 is a combination nugget ice maker and countertop dispenser, with the option of wall mounting. A water station is standard. -
Page 2: For The Installer
ND650 FOR THE INSTALLER: Specifications This ice maker-dispenser is designed to be mounted on a machine stand, or a countertop, or using wall mounting kit KWB3, hung from a wall. The sink may be retained, or removed and the optional longer splash panel (KSP1) installed in place of the original. -
Page 3: Environmental Limitations
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 use of any part and/or other components not specifically approved by Scotsman. - Page 4 Counter Top or Machine Stand Installation The base of the icemaker-dispenser must be sealed to the object it rests upon. Food grade silastic sealant such as Scotsman part number 19-0529-01 is recommended. Place a bead of the sealant on the machine stand or counter top to match the outside edge of the cabinet base and sink.
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Page 5: Wall Mount Kit
3. Lift unit up and hook bracket "A" over bracket "B". Slide unit until the two remaining holes are aligned and secure with the remaining (2) 1/4-20 bolts, flat washers and lockwashers. March, 1989 Page 5 ND650 SIDE BASE ROUTING HOLE... -
Page 6: Soda Valve Kit
3. Remove large plug from base of icemaker-dispenser. 4. Install valve assembly in the ice machine with Note: The water glass filler station will have to be removed, this includes: glass filler lever, water tube, spring, as well as the filler plate with the switch on it. -
Page 7: For The Plumber
WATER INLET CABINET DRAIN OPTIONAL WATER FILTER WATER INLET SHUT OFF VALVE VENTED DRAIN TUBE WATER COOLED DETAIL CONDENSER WATER INLET POTABLE WATER INLET CONDENSER March, 1989 Page 7 ND650 FLOOR DRAIN CABINET DRAIN DRAIN... -
Page 8: For The Electrician
ND650 FOR THE ELECTRICIAN CONFORM TO ALL APPLICABLE CODES The electrical power to the unit is supplied through the junction box at the ELECTRICAL rear of the machine. POWER Check the nameplate (located on the back panel) for the voltage requirements, and for the minimum circuit ampacity. -
Page 9: Final Check List
7. Is there a water shut off valve installed near the machine? 8. Have all of the shipping blocks been removed? BACK VIEW OF COMPLETED INTSTALLATION ICEMAKER DISPENSER PLUMBING? MACHINE STAND March, 1989 Page 9 ND650 ELECTRICAL? LEVELED? -
Page 10: Start Up
Make sure they know who to call for service. 10. Fill out the warranty registration card, and mail it in to Scotsman. 11. Fill out the field Quality Audit form, and mail it to Scotsman. March, 1989... -
Page 11: Component Description
Turning this knob adjusts the length of time of dispense. 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. ICE LEVEL SENSORS... - Page 12 ND650 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"...
- Page 13 ND650 COMPONENT DESCRIPTION: Control Box Contactor: A definite purpose contactor connecting the compressor to the power supply. PORTION CONTROL Circuit Board: Controlling MODULE the ice machine through sensors and relays. The sensors are for ice level and water level. The relays are for...
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Page 14: Electrical Sequence
ND650 ELECTRICAL SEQUENCE Refer the wiring diagram as needed. If the machine is switched off at the master switch, but is otherwise ready to go, switching the master switch to on does the following: The bin empty light on the circuit board goes on... -
Page 15: Operation
ND650 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 16 ND650 OPERATION: Refrigeration Beginning at the compressor, the refrigerant 502 is compressed into a high temperature gas. The discharge line directs this gas to the condenser. At the condenser (air or water cooled) the gas is cooled by either air or water and it then condenses into a liquid.
- Page 17 ND650 OPERATION: Ice Vending When the ice dispensing glass filler lever is pushed, an electrical circuit is made to the portion control module in the control box. That module will energize the agitator drive motor for a certain length of time, depending upon the setting of the portion control knob.
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Page 18: Maintenance And Cleaning
ND650 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 19 ///////////////////////////WARNING///////////////////////////// Disconnect electrical power before beginning. ////////////////////////////////////////////////////////////////////////// 1. The ice machine senses water level by a probe located in the water reservoir. At least twice a year, the probe should be removed from the reservoir, and the tip wiped clean of mineral buildup.
- Page 20 ND650 MAINTENANCE AND CLEANING In some areas, the water supply to the ice maker ALLEN will contain a high concentration of minerals, and HEAD that will result in an evaporator and auger SCREWS becoming coated with these minerals, requiring a more frequent removal than twice per year.
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Page 21: Service Diagnosis
G. Check the water level in the reservoir. The machine will not run if there is not enough water in the reservoir. March, 1989 Page 21 ND650... - Page 22 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 23 B. Check the compressor 1. Check the compressor start relay. 2. Check the start capacitor. 3. Check the windings of the compressor for open windings or shorts to ground. Replace those items found defective. March, 1989 Page 23 ND650...
- Page 24 ND650 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.
- Page 25 ND650 SERVICE DIAGNOSIS: Condition - Poor or No Ice Dispensing STATUS: There is power to the unit, but no ice dispensed A. Check for ice in the bin. If no ice, check the ice making system. If the ice making system is normal, the demand for ice may exceed the quantity the icemaker dispenser can produce.
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Page 26: Removal And Replacement
ND650 REMOVAL AND REPLACEMENT 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 27: Breaker And Bearing
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 28: 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. -
Page 29: 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 30: Evaporator
ND650 REMOVAL AND REPLACEMENT 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. 2. Unsweat the refrigerant connections: a) At the thermostatic expansion valve outlet. -
Page 31: Gearmotor
If there were no shims on the new parts, do not use any shims. Do not use the old shims. 4. Bench test the gearmotor, check for oil leaks, noise, and amp draw. March, 1989 Page 31 ND650... -
Page 32: To Remove And Repair The Gearmotor Assembly
ND650 TO REMOVE AND REPAIR THE GEARMOTOR ASSEMBLY WATER SHED GREASE SEAL GEARCASE COVER FIRST GEAR AND BEARINGS SECOND GEAR AND BEARINGS GASKET GEARCASE /////////////////////////////WARNING//////////////////////////// Disconnect electrical power before begining removal procedures. ////////////////////////////////////////////////////////////////////////// March, 1989 Page 32 CENTRIFUGAL SWITCH DRIVE MOTOR... -
Page 33: Electronic Tester
If the machine starts, replace the ice level sensors. If the Bin Empty light does not come ON, the circuit board should be replaced. PHOTO TRANS LIGHT GOES SWITCH TO “BIN EMPTY” March, 1989 Page 33 ND650 LIGHT GOES ON LIGHT GOES... - Page 34 REMOVAL AND REPLACEMENT Water Level 1. Unplug "water sen" connector from control board. 2. Plug "water sen" connector from Scotsman tester into circuit board. a. Move "water" switch on tester to No Water position. The No Water light on the circuit board should go ON.