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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 NDE750 is a combination nugget ice maker
and countertop dispenser. A water station is
standard.
FOR THE INSTALLER: Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 2
FOR THE INSTALLER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
FOR THE PLUMBER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
FOR THE ELECTRICIAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
FOR THE INSTALLER: Final Check List . . . . . . . . . . . . . . . . . . . . . . . . 6
COMPONENT DESCRIPTION: Control Box . . . . . . . . . . . . . . . . . . . . . . . 9
ELECTRICAL SEQUENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
OPERATION: Refrigeration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
OPERATION: Ice Vending . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
CLEANING and SANITIZING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
MAINTENANCE AND CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
MAINTENANCE AND CLEANING: Auger . . . . . . . . . . . . . . . . . . . . . . . . 17
SERVICE DIAGNOSIS: Condition - No Ice Being Produced . . . . . . . . . . . . . . 18
SERVICE DIAGNOSIS: Condition - Poor or No Ice Dispensing . . . . . . . . . . . . . 22
REMOVAL AND REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
REMOVAL AND REPLACEMENT: Bearing And Breaker . . . . . . . . . . . . . . . . 24
REMOVAL AND REPLACEMENT: Water Seal . . . . . . . . . . . . . . . . . . . . . 26
TO REMOVE AND REPAIR THE GEARMOTOR ASSEMBLY . . . . . . . . . . . . . 28
REFRIGERATION SERVICE: HP62 . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
REFRIGERATION SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
This manual was printed on recycled paper.
Keep it for future reference.
Table of Contents
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The NDE750 ice making section is equipped with
the following features: electronic controls for bin
level and low water; thermostatic expansion valve;
front service for most components; and R-404a
(HP62) 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.
. . . . . . . . . . . . . . . . 21
Note this symbol when it appears.
December 1993
Page 1
It marks a possible hazard.
NDE750
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Table of Contents
Related Manuals for Scotsman NDE750
Summary of Contents for Scotsman NDE750
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Page 1: Table Of Contents
The NDE750 is a combination nugget ice maker and countertop dispenser. A water station is standard. FOR THE INSTALLER: Specifications ......2 FOR THE INSTALLER . -
Page 2: For The Installer: Specifications
+ Minimum Circuit Ampacity is used to determine wire size and type per National Electric Code. Optional kit: KPC750 adds dispense portion control to units mfg. after 6/97. Scotsman assumes no liability or responsibility of any kind for products manufactured by Scotsman... -
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
NDE750 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
NDE750 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: For The Installer: Final Check List
NDE750 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: Initial Start Up
Make sure they know who to call for service. 10. Fill out the Customer Evaluation and warranty Registration form, and mail it in to Scotsman. December 1993 Page 7 NDE750... -
Page 8: Component Description
Will shut the machine off it there is none. 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. WATER... -
Page 9: Component Description: Control Box
The time is varied by adjusting the portion control knob. Note: Portion control not standard on units mfg. after 6/97. May be added on with kit KPC750. TRANSFORMER CIRCUIT BOARD PORTION CONTROL May 1997 Page 9 NDE750 POTENTIAL RELAY CONTACTOR... - Page 10 NDE750 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 continuous dispensing. Releasing and re-pushing the glass filler lever will repeat the dispense cycle. December 1993 Page 11 NDE750... -
Page 12: Operation: Water
NDE750 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 13: Operation: Refrigeration
REFRIGERATION SCHEMATIC (AIR COOLED SHOWN) SUCTION LINE DISCHARGE LINE COMPRESSOR December 1993 Page 13 NDE750 THERMOSTATIC EXPANSION VALVE EVAPORATOR... -
Page 14: Operation: Ice Vending
NDE750 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. -
Page 15: Cleaning And Sanitizing
CLEANING and SANITIZING 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: Maintenance And Cleaning
NDE750 MAINTENANCE AND CLEANING 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 build-up. -
Page 17: Maintenance And Cleaning: Auger
4. Check with light to see if fins are clean all the way through. 5. Use coil cleaner if grease is deep inside fins. 6. Replace service panel and reconnect power. December 1993 Page 17 NDE750 BREAKER AND AUGER ASSEMBLY... -
Page 18: Service Diagnosis: Condition - No Ice Being Produced
NDE750 SERVICE DIAGNOSIS: Condition - No Ice Being Produced STATUS: ICE MAKER DOES NOT OPERATE A. Check: Voltage to the unit, restore power 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 Tester Model NM1 into the circuit board.
- Page 20 NDE750 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.
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Page 21: Service Diagnosis: Condition - Low Ice Production
NDE750 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: Service Diagnosis: Condition - Poor Or No Ice Dispensing
NDE750 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 can produce. -
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. FLOAT VALVE VALVE PLUNGER LOCKING TAB December 1993 Page 23 NDE750... -
Page 24: Removal And Replacement: 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 Scrub the auger with ice machine cleaner and hot water. 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.
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Page 26: Removal And Replacement: 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 Do Not Drop Into the Evaporator. 3. Complete the reassembly by reversing the disassembly for the breaker & thrust bearing assembly. WATER SEAL DRIP PAN December 1993 Page 27 NDE750 BREAKER ICE SWEEP BREAKER BEARING AUGER...
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Page 28: To Remove And Repair The Gearmotor Assembly
NDE750 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. Electrical Shock Hazard. Disconnect electrical power to the icemaker - dispenser before beginning. -
Page 29: Refrigeration Service: Hp62
As with any other refrigerant, do NOT mix HP62 with pressurized air when leak testing. The vacuum pump or recovery unit should use polyolester oil. Pressure-Temperature Chart for HP62 VAPOR TEMP. PRESSURE (DEG F) (PSIG) December 1993 Page 29 NDE750 VAPOR TEMP. PRESSURE (DEG F) (PSIG) -
Page 30: Refrigeration Service
Scotsman also recommends that, at the time of initial start up, gauges not be used. If gauges must be used, don’t always check the high side pressure. -
Page 31: Circuit Board Testing
If the Bin Empty light does not come ON, the circuit board should be replaced. LIGHT GOES SWITCH TO “BIN EMPTY” December 1993 Page 31 NDE750 LIGHT GOES ON LIGHT OFF... - Page 32 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.