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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 NDE754 is a combination nugget ice maker
and countertop dispenser. A water station is
standard.
FOR THE INSTALLER: Specifications · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 2
FOR THE INSTALLER · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 3
FOR THE PLUMBER · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 4
FOR THE ELECTRICIAN · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 5
FOR THE INSTALLER: Final Check List · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 6
INITIAL START UP · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 7
COMPONENT DESCRIPTION · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 8
COMPONENT DESCRIPTION · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 9
Control Box · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 10
ELECTRICAL SEQUENCE · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 11
OPERATION: Water · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 12
OPERATION: Refrigeration · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 13
OPERATION: Ice Vending · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 14
CLEANING and SANITIZING · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 15
SENSOR MAINTENANCE · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 16
BEARING MAINTENANCE · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 17
AUGER MAINTENANCE · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 18
SERVICE DIAGNOSIS · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 19
CONTROL SYSTEM DIAGNOSTICS
REMOVAL AND REPLACEMENT · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 21
REMOVAL AND REPLACEMENT: Bearing And Breaker · · · · · · · · · · · · · · · · · · · · Page 22
REMOVAL AND REPLACEMENT · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 23
REMOVAL AND REPLACEMENT: Water Seal · · · · · · · · · · · · · · · · · · · · · · · · · · Page 24
REMOVAL AND REPLACEMENT · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 25
TO REMOVE AND REPAIR THE GEARMOTOR ASSEMBLY · · · · · · · · · · · · · · · · · · Page 26
REFRIGERATION SERVICE · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 27
This manual was printed on recycled paper.
Keep it for future reference.
The NDE754 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.
Table of Contents
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 20
March 2000
Page 1
Note this symbol when it appears.
It marks a possible hazard.
NDE754
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Related Manuals for Scotsman NDE754
Summary of Contents for Scotsman NDE754
- Page 1 The NDE754 is a combination nugget ice maker and countertop dispenser. A water station is standard. FOR THE INSTALLER: Specifications · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 2 FOR THE INSTALLER ·...
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Page 2: For The Installer: Specifications
*Minimum circuit ampacity is used to determine wire size and type per National Electric Code. Options: Machine stand DMS31. Portion control kit KPC750. 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 parts and/or other components not specifically approved 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
NDE754 FOR THE PLUMBER CONFORM TO ALL APPLICABLE CODES Water Inlet Air Cooled Models: Connect a clean, potable and cold water supply to the ” male flare at the back of the cabinet. Install a hand valve near the machine to control the water supply. Use “... -
Page 5: For The Electrician
NDE754 FOR THE ELECTRICIAN CONFORM TO ALL APPLICABLE CODES Connect the electrical power supply for the unit to the wires in 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
NDE754 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
9. Give the owner/user the service manual, instruct him/her in the operation and maintenance requirements of the unit. 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. March 2000 Page 7... -
Page 8: Component Description
Will shut the machine off it there is none. Low Pressure Cut Out Switch: An automatic reset control that shuts off the ice machine when the low side pressure drops below a preset point, 15 psig. -
Page 9: Water Seal
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 10: Control Box
NDE754 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 gear motor (with a built in time delay to clear the evaporator of ice when the unit turns off) and for the compressor. -
Page 11: Electrical Sequence
The service light will then be glowing continuously. To Reset: Disconnect and reconnect power to the ice machine. Separate from the circuit board: · If the high pressure cut out switch opens the machine stops immediately. -
Page 12: Operation: Water
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
OPERATION: Refrigeration Beginning at the compressor, the refrigerant 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 14: Operation: Ice Vending
NDE754 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 agitator drive motor. -
Page 15: Cleaning And Sanitizing
Return the drain tube to its normal upright position and replace the end cap. 7. Prepare the cleaning solution: Mix eight ounces of Scotsman Ice Machine Cleaner with three quarts of hot water. The water should be between 90-115 degrees F. -
Page 16: Sensor Maintenance
SENSOR MAINTENANCE 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. SLIDE SENSORS UP TO REMOVE 2. -
Page 17: Bearing Maintenance
If the bearing only needs grease, inject grease into the bearing using Scotsman grease needle pn Breaker 02-3559-01 and Scotsman bearing grease Cover cartridge, pn A36808-001. -
Page 18: Auger Maintenance
AUGER MAINTENANCE 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 more frequent removal than twice per year. If in doubt about the condition of the evaporator and auger, the auger can be removed so the parts can be inspected. -
Page 19: Service Diagnosis
(air cooled). Auger can’t turn. Circuit board has not yet shut unit down. Circuit board has shut ice machine down due to high auger motor amp draw. Check for cause of high amp draw, including bearings, gearmotor condition and scale on auger and in evaporator. -
Page 20: Control System Diagnostics
If it is on, the ice sensors may be blocked. Remove them and check for mineral scale. Scotsman's test box can also be used to determine if the ice sensors or board are defective. -
Page 21: Removal And Replacement
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 22: 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 23: Sharp Edges
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. -
Page 24: 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 25 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. Recover the refrigerant from the ice maker. 2. Unsweat the refrigerant connections: a) At the thermostatic expansion valve outlet. Heat sink the TXV body when unsweating or resweating the adjacent tubing.
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Page 26: To Remove And Repair The Gearmotor Assembly
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 27: Refrigeration Service
10. Re-open the manifold valves until all liquid has flowed out of the hoses. 11. Shut the low side access valve on the ice R-404A machine. Tank Must 12. Remove hoses from ice machine and replace Be in Liquid all caps. Dispensing Position - Check Tank!
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