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TDE470 Service Manual
Purpose of this manual: To provide detailed
installation and operation instructions; to give
insights into how the machine works; to list
possible causes for problems; and to suggest
procedures for specific types of service.
To The Installer: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 3
For The Electrician . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 4
For The Plumber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 5
Optional Kits: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 6
User Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 9
Refrigeration System Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 11
Water System Operation: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 12
Maintenance: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 15
Auger and Bearing Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 17
Inspection: Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 18
Service Diagnosis: Circuit Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 22
Electrical System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 23
Water System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 25
Bearings, Water Seal and Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 26
Bearing Replacement: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 27
Refrigeration System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 28
A Parts List and Wiring Diagram are located in the center of this manual, on yellow paper.
Table of Contents
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The TDE470 is an ice maker and dispenser
combined into one cabinet. The refrigeration
system is air cooled, using R-134a as a refrigerant.
The control system uses electric eyes as a bin
control and a water level sensor as the water
safety control. As ice is made, it fills a plastic
storage bin. When ice is needed, a motor rotates a
stainless steel vane inside the storage bin and
sweeps the ice into the spout.
February 1995
Page 1
TDE470
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Summary of Contents for Scotsman TDE470
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Page 1: Table Of Contents
......... Page 30 A Parts List and Wiring Diagram are located in the center of this manual, on yellow paper. The TDE470 is an ice maker and dispenser combined into one cabinet. The refrigeration system is air cooled, using R-134a as a refrigerant. -
Page 2: Specifications
A stainless steel panel kit may be installed at the field level to change the finish to stainless steel. The kit number is: SPKFD470 Scotsman ice machines, like the TDE470, are designed to be installed indoors, in a controlled environment. The minimum and maximum... -
Page 3: To The Installer
A professional installation of any product is critical to the long term satisfaction of the user. The TDE470 is designed to be installed either on a counter, or, using a wall hanging kit, hung from a wall. Another option is a kit to increase the cabinet height which will allow taller containers to be placed under the spout. -
Page 4: For The Electrician
Electrical connections: Check the nameplate for voltage and current requirements. An electrical cord is not supplied. Connect the TDE470 to a separate electrical circuit. Wiring to the machine must conform to all codes. A licensed electrician may be required in some situations. -
Page 5: For The Plumber
Follow all local codes. Water Supply Overflow Drains " " plastic tube. Water Inlet Fitting (Inside Cabinet) Strainer or Filter Bin and Reservoir February 1995 Page 5 TDE470 FOLLOW ALL APPLICABLE LOCAL, STATE AND NATIONAL CODES Sink Drain Building Drain (Typical) -
Page 6: Optional Kits
TDE470 Optional Kits: Sink Extension (KDE1A enamel or KDE1A-SS stainless steel): If installed, follow these steps, if not go to step 2. A. Unplug or disconnect electrical power. B. Remove top and right side panels. C. Shut off water supply and disconnect water inlet tube. -
Page 7: Wall Mount Kit (Kwb1)
Installation: Check building wall for the strength required to support a machine of the TDE470’s weight and size. Note that if at least 6" of space is not left above the machine, cleaning and most service of the machine will require removal of the machine from the wall mounts. -
Page 8: Final Check List & Initial Start Up
10. Explain to the user the maintenance requirements and operation of the machine. 11. Fill out the Warranty Registration and Customer Evaluation form. Mail it to Scotsman. 12. Leave the service manual with the owner/user and explain who should be called if service is needed. -
Page 9: User Operation
TDE470 User Operation The TDE470 is an automatic ice vending machine. All it requires is cool air, clean water and an adequate supply of electrical power. To Vend Ice: Place a container in front of the Touch Free sensor and below the ice spout. Hold it there until the container is full of ice. -
Page 10: Component Location & Function
Evaporator Auger Drive Condenser. The TDE470 uses an air cooled condenser. It blows Compressor air out, away from the fan motor. Bin Cover The heat removed from the water is exhausted from the condenser. -
Page 11: Refrigeration System Operation
At the compressor the cycle is repeated. The TDE470 uses a low side pressure control as a safety, it will shut the system down if the suction pressure is too low for reliable operation. -
Page 12: Water System Operation
TDE470 Water System Operation: The water system consists of a float valve, reservoir and water dispense solenoid valve. The water level in the reservoir tank is the same level as that inside the evaporator. Building water supply flows to both the float valve and the solenoid. The float valve will open to add water to the reservoir as water flows out to the evaporator. -
Page 13: Mechanical Operation
Mechanical Operation General: The TDE470 makes, stores and dispenses ice. It also dispenses water. The ice making portion of the machine produces flaked ice at about 32 The ice falls thru a chute into the dispensing bin. Above the cylindrical bin is a dispense drive motor and electric eyes. -
Page 14: Electrical Sequence
TDE470 Electrical Sequence Refer the wiring diagram as needed. The "Power" light on the board glows whenever there is power to the machine (and the master switch is ON). If the machine is switched off at the master switch, but is otherwise ready to go, switching the master... -
Page 15: Maintenance
2. Remove top and right side panels. 3. Unplug or disconnect electrical power. 4. Shut off water supply. 5. Drain reservoir. 6. Mix 8 ounces of Scotsman Ice Machine Cleaner and 3 quarts of hot (95 F. -115 Scotsman Ice Machine Cleaner contains acids. -
Page 16: Dispense Area Sanitation
TDE470 Dispense Area Sanitation The dispense area is made up of the spout, sink, grill and splash panel. It requires periodic cleaning and sanitation. 1. The spout may be removed by taking out the two mounting screws. Wash and sanitize it. -
Page 17: Auger And Bearing Inspection
Auger and Bearing Inspection While in most areas regular in-place cleaning with Scotsman Ice Machine Cleaner will be adequate to keep the interior of the evaporator free of excessive mineral build up, some water conditions may require more intense methods. In addition, the auger bearings require physical inspection to determine that they are not wearing. -
Page 18: Inspection: Auger
There should be minimal rust or dirt. If in doubt, replace the bearing. Note: The top bearing used in the TDE470 is a "directional" bearing. Note which way the inner race is configured and install into the breaker. The breaker is also available as a replacement part with the top bearing already installed. -
Page 19: Water Level Sensor
"look" at the ice. If clouded by mineral scale, the eyes will cause the ice machine to shut off and stay off. To clean the photo-electric eyes. -
Page 20: Service Diagnosis
TDE470 Service Diagnosis PROBLEM No ice is dispensed. POSSIBLE CAUSE No ice in bin due to: No electrical power Overuse Water supply turned off Bin controls dirty Water sensor dirty Control system malfunction Auger drive motor open Centrifugal switch open... - Page 21 Gear motor does not turn Centrifugal switch does not close Fan motor does not turn Lack of refrigerant Compressor does not pump February 1995 Page 21 TDE470 PROBABLE CORRECTION Clean water system with ice machine cleaner. Grease coupling Replace coupling and adapter stand.
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Page 22: Service Diagnosis: Circuit Board
TDE470 Service Diagnosis: Circuit Board Circuit Board Light Identification Explanation of Indicator Light or Reset Will be On after the second auger motor trip, indicating that the machine must be cleaned and/or inspected for drive train maintenance and manually reset. -
Page 23: Electrical System
TDE470 Electrical System Bin and Water Level Sensors There are two indicator lights on the control board. The Bin Empty light glows when there is no ice between the electric eyes. The Water Level light only glows when there is a lack of water in the reservoir. -
Page 24: Removal And Replacement
TDE470 Removal and Replacement Panels: 1. Remove two screws at the back of the top panel. 2. Lift up at the back and push the top panel forward to release it. 3. Remove 3 screws at the top, 3 screws at the bottom and 1 screw at the front edge of each side panel. -
Page 25: Water System
5. Remove wire harness from inlet water valve. 6. Remove tube connecting outlet of the valve to the dispense tube. 7. Rotate the valve to unscrew it from its inlet fitting. 8. Reverse to reassemble. Valve Water Level Sensor Slot February 1995 Page 25 TDE470... -
Page 26: Bearings, Water Seal And Auger
TDE470 Bearings, Water Seal and Auger 1. Disconnect electrical power. Rotating parts hazard. Disconnect Electrical Power Before Beginning. 2. Shut off the water supply. 3. Remove the top panel. 4. Remove the side panels. 5. Drain the reservoir and evaporator. -
Page 27: Bearing Replacement
1. Remove old rotating half from the auger. Clean the mounting area. 2. Place a bead of food grade sealant (such as Scotsman part number 19-0529-01) onto the shoulder of the auger where the rotating half of the water seal will be installed. -
Page 28: Refrigeration System
TDE470 Refrigeration System This ice machine uses R-134a as the refrigerant. This refrigerant has no chlorine, and therefore requires polyolester type refrigerant oil. This oil requires specific service procedures. General Service A HFC type liquid line drier is required. "Standard"... -
Page 29: Gear Reducer Removal
16. Rebuild or replace the gear reducer. Rotor Bearing February 1995 Page 29 TDE470 Shaft Seals- 2, back to back E-Clip Woodruff Key Output Gear Gear Case... -
Page 30: Auger Drive Motor
TDE470 Auger Drive Motor The windings or top bearing & cover may be replaced without removing the evaporator or gear reducer from the machine. 1. Disconnect electrical power. Electrical Shock Hazard Disconnect electrical power before beginning. 2. Shut off water supply.