Table of Contents
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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 ND750 is a combination nugget ice maker and
countertop dispenser. A water station is standard.
The ND750 ice making section is equipped with
the following features: electronic controls for bin
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2
Location/Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 3
For the Plumber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 4
Final Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 6
Inital Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 7
Component Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 8
Electrical Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 11
Maintenance and Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 15
Bearing and Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 24
Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 25
Gearmotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 28
Electronic Circuit Tester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 29
Wiring diagrams and parts lists are located in the middle of this manual, printed on yellow
paper .
TABLE OF CONTENTS
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.
January, 1989
Page 1
ND750
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Summary of Contents for Scotsman ND750
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Page 1: Table Of Contents
The ND750 is a combination nugget ice maker and countertop dispenser. A water station is standard. The ND750 ice making section is equipped with... -
Page 2: Specifications
Scotsman Ice Systems are designed and manufactured with the highest regard for safety and performance. They meet or exceed the standards of U.L., N.S.F., and C.S.A. Scotsman assumes no liability or responsibility of any kind for products manufactured by Scotsman 3/8" FPT Cond. -
Page 3: For The Installer
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. -
Page 4: For The Plumber
ND750 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, connect to the 3/8" male flare at the back of the cabinet. Install a hand valve near the machine to control the water supply. -
Page 5: For The Electrician
ND750 FOR THE ELECTRICIAN CONFORM TO ALL APPLICABLE CODES The electrical power to the unit is supplied through the junction box at the rear of the machine. Check the nameplate (located on the back panel) for the voltage requirements, and for the minimum circuit ampacity. -
Page 6: Final Check List
ND750 FOR THE INSTALLER: Final Check List 1. Is the icemaker-dispenser installed ELECTRICAL? indoors, in a location where the air and LEVELED? water temperatures are controlled, and where they do not go beyond design limitations? 2. is there an electrical service... -
Page 7: Inital 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. January, 1989... -
Page 8: Component Description
Will shut the machine off it there is none. 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 PRESSURE PRESSURE CUT OUT... - Page 9 ND750 COMPONENT DESCRIPTION: Control Box Contactor: A definite purpose contactor connecting the compressor to the power supply. Circuit Board: Controlling the ice machine through sensors and relays. The sensors are for ice level and water level. The relays are for the...
- Page 10 ND750 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 11: Electrical Sequence
Holding the glass filler lever in will not cause additional dispensing, unless the portion control is set for continious dispensing. Releasing and re-pushing the glass filler lever will repeat the dispense cycle. January, 1989 Page 11 ND750... -
Page 12: Operation
ND750 OPERATION: Water ADJUSTMENT OF THE WATER RESERVOIR RESERVOIR RESERVOIR DRAIN WATER INLET DRAIN TUBE 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. - Page 13 REFRIGERATION SCHEMATIC (AIR COOLED SHOWN) SUCTION LINE DISCHARGE LINE COMPRESSOR HI PRESSURE CUT OUT January, 1989 Page 13 ND750 THERMOSTATIC EXPANSION VALVE EVAPORATOR...
- Page 14 ND750 OPERATION: Ice Vending When the ice dispensing glass filler lever is pushed, an electrical circuit is made to the ice chute door solenoid causing the ice chute door to open. At the same time power is connected to the portion control module in the control box.
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Page 15: Maintenance And Cleaning
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 16 ///////////////////////////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 17 ND750 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 and auger becoming coated with these minerals, requiring a BREAKER AND more frequent removal than twice per year.
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Page 18: Service Diagnosis
ND750 SERVICE DIAGNOSIS: Condition - No Ice Being Produced STATUS: ICE MAKER DOES NOT OPERATE 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. - Page 19 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 20 ND750 SERVICE DIAGNOSIS: Condition - No Ice Being 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 21 ND750 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 22 ND750 SERVICE DIAGNOSIS: Condition - Poor or No Ice Dispensing STATUS: There is power to the unit, but no ice is 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 cam produce.
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Page 23: Removal And Replacement
6. Reverse to reassemble, be certain that the bin controls are aligned so that the ice level sensors are visible (centered) through the holes in the ice chute. January, 1989 Page 23 ND750 SLIDE HOUSINGS UP TO REMOVE... -
Page 24: 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 25: 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 26: 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 27: Evaporator
Do Not Drop Into the Evaporator. 3. Complete the reassembly by reversing the disassembly for the breaker & thrust bearing assembly. SEAL DRIP PAN January, 1989 Page 27 ND750 BREAKER ICE SWEEP BREAKER BEARING AUGER... -
Page 28: Gearmotor
ND750 TO REMOVE AND REPAIR THE GEARMOTOR ASSEMBLY (Assuming that the procedures through removal of the water seal have been performed.) 1. Remove the electrical wires from the gear drive motor. 2. Unscrew the 4 cap screws holding the gearmotor to the gearmotor plate. -
Page 29: Electronic Circuit Tester
If the Bin Empty light does not come ON, the circuit board should be replaced. LIGHT GOES SWITCH TO “BIN EMPTY” January, 1989 Page 29 ND750 LIGHT GOES ON LIGHT OFF... - Page 30 Circuit Board Testing 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.