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MDT3F and MDT4F 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.
Specifications: · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 2
To The Installer: · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 3
For The Electrician · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 4
For The Plumber · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 5
Wall Mount Kit (KWB4): · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 6
Final Check List & Initial Start Up · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 7
User Operation · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 8
Component Location & Function · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 9
Refrigeration System Operation · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 10
Water System Operation: · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 11
Mechanical Operation · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 12
Electrical Sequence · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 13
Maintenance: · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 14
Dispense Area Sanitation · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 15
Auger and Bearing Inspection · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 16
Inspection: Top Bearing · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 17
Inspection:· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 18
Service Diagnosis · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 19
Service Diagnosis · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 20
Service Diagnosis: Circuit Board · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 21
Removal and Replacement · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 22
Water System · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 23
Bearings, Water Seal and Auger · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 24
Top Bearing Replacement · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 25
Water Seal & Bottom Bearing Replacement: · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 26
Refrigeration System · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 27
Gear Reducer Removal · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 28
Auger Drive Motor · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 29
The MDT3F and MDT4F are combination ice
makers and dispensers. 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.
New Table of Contents
April 2010
Page 1
MDT3F & MDT4F
Note this symbol when it appears.
It marks a possible hazard.
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Table of Contents
Related Manuals for Scotsman MDT4FA-1
Summary of Contents for Scotsman MDT4FA-1
- Page 1 MDT3F & MDT4F MDT3F and MDT4F Manual The MDT3F and MDT4F are combination ice Purpose of this manual: To provide detailed makers and dispensers. The refrigeration system installation and operation instructions; to give is air cooled, using R-134a as a refrigerant. The insights into how the machine works;...
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Page 2: Specifications
MDT3F & MDT4F Specifications: Scotsman ice machines, like the MDT3F or Scotsman Ice Systems are designed and MDT4F, are designed to be installed indoors, in a manufactured with the highest regard for safety controlled environment. The minimum and and performance. They meet or exceed the maximum operating conditions are: standards of UL, NSF and CUL. -
Page 3: To The Installer
MDT3F & MDT4F To The Installer: A professional installation of any product is critical Water Quality: to the long term satisfaction of the user. The ice The quality of the water supplied to the machine maker-dispenser is designed to be installed either will directly affect the purity of the ice and the on a counter, or, using a wall hanging kit, hung reliability of the machine. -
Page 4: For The Electrician
MDT3F & MDT4F For The Electrician Electrical connections: Check the nameplate for voltage and current requirements. An electrical cord is not supplied. Connect the MDT3F or MDT4F 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
MDT3F & MDT4F For The Plumber Drains: The dispenser requires a gravity drain. The pitch on the drain tubes must be at least ¼ inch fall per foot of horizontal run. On long horizontal runs, a vent at the back of the cabinet will improve draining, and is recommended. -
Page 6: Wall Mount Kit (Kwb4)
MDT3F & MDT4F Wall Mount Kit (KWB4): Contents: Top Wall Bracket: 1. Top Case Hanger Bracket: Attaches to the frame 1. Hold the bracket on the wall where it will be of the dispenser. mounted. 2. Top Wall Bracket: Mounts to the wall and 2. -
Page 7: 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 8: User Operation
MDT3F & MDT4F User Operation The MDT3F and the MDT4F are automatic ice vending machines. All either 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. -
Page 9: Component Location & Function
MDT3F & MDT4F Component Location & Function Evaporator. This is a vertical cylinder full of water and refrigerated. Also in the cylinder is a slowly rotating auger. The auger forces the ice up the evaporator walls and compresses it at the top. The resulting flaked ice then falls by gravity into the ice storage bin. -
Page 10: Refrigeration System Operation
MDT3F & MDT4F Refrigeration System Operation Both the MDT3F and the MDT4F use a forced draft System Characteristics: · condenser, capillary tube and hermetic Typical Low Side Pressure: compressor. The system uses R-134a as a 13 - 14 PSIG refrigerant. High pressure, high temperature ·... -
Page 11: Water System Operation
MDT3F & MDT4F Water System Operation: The water system consists of a float valve, Inside the evaporator there is a water seal. This reservoir and water dispense solenoid valve. The seal is the type that has a rotating half and a water level in the reservoir tank is the same level stationary half. -
Page 12: Mechanical Operation
MDT3F & MDT4F Mechanical Operation General: The machine makes, stores and dispenses ice. It Ice Vending also dispenses water. The ice making portion of Dispensing takes place when the touch free the machine produces flaked ice at about 32 sensor’s infrared beam bounces back to the The ice falls thru a chute into the dispensing bin. -
Page 13: Electrical Sequence
MDT3F & MDT4F Electrical Sequence Refer the wiring diagram as needed. Shut Down consists of: · The compressor contactor opens The “Power” light on the board glows whenever · there is power to the machine (and the master The compressor stops switch is ON). -
Page 14: Maintenance
15. Pull out the vane and bin bottom from the bin. 5. Drain reservoir. 16. Thoroughly wash the bin’s interior, bin top 6. Mix 8 ounces of Scotsman Ice Machine Cleaner interior, spout, ice vane and bin bottom with the and 3 quarts of hot (95 F. -
Page 15: Dispense Area Sanitation
MDT3F & MDT4F Dispense Area Sanitation 1. The spout may be removed by taking out the two mounting screws. Wash and sanitize it. 2. The sink grill may be removed for washing and sanitizing. 3. The sink should be flushed with hot water and wiped clean with sanitizer. -
Page 16: Auger And Bearing Inspection
Auger and Bearing Inspection While in most areas regular in-place cleaning with If the auger still will not move, bearing replacement Scotsman scale remover will be adequate to keep is mandatory. See Bearing Removal and the interior of the evaporator free of excessive Replacement. -
Page 17: Inspection: Top Bearing
Wipe out Thrust Washer and Bearing any contaminated grease. Add new grease, Scotsman part number 19-0662-02. If water or rust is present, replace the bearing. 6. Check the bottom of the evaporator for water leaks. -
Page 18: Water Level Sensor
1. Remove the top panel. 2. Pull both of the photo-electric eyes out of their rubber grommets. 3. Wash both eyes with a clean cloth dipped in Scotsman Ice Machine Cleaner. Clean Photo-Electric Eyes 4. Wash the eyes off with clean water. -
Page 19: Service Diagnosis
MDT3F & MDT4F Service Diagnosis PROBLEM POSSIBLE CAUSE PROBABLE CORRECTION No ice is dispensed. No ice in bin due to: · Check/restore power No electrical power · Recheck ice needs vs. machine Overuse capacity. · Check water filter/hand valve/float Water supply turned off valve ·... - Page 20 MDT3F & MDT4F Service Diagnosis PROBLEM POSSIBLE CAUSE PROBABLE CORRECTION Unusual noise Mineral scale in evaporator Clean water system with ice machine cleaner. Auger coupling dry Grease coupling Auger coupling worn Replace coupling and adapter stand. Bearings worn Replace bearings and water seal. Gear motor loose on frame Tighten bolts, check grommets Low water level...
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Page 21: Service Diagnosis: Circuit Board
MDT3F & MDT4F Service Diagnosis: Circuit Board Explanation of Indicator Light Position On Name and Meaning of Board Light or Reset On at all times when the master switch is ON and machine is Power, connected to electrical power. ON = Normal On when ice level is low (unit making ice). - Page 22 Scotsman MTD3, MDT4, MDT5, MDT6 Service Diagnostic - Touch Free and Control System The MDT controller operates the refrigeration and dispensing systems. The on/off of the ice making system is determined by infrared sensors. Ice or water dispensing is also determined by infrared sensors.
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Page 23: Removal And Replacement
MDT3F & MDT4F Removal and Replacement Panels: Dispense Vane 1. Remove two screws at the back of the top 1. Disconnect electrical power. panel. Dispense Drive Bin Top 2. Lift up at the back and push the top panel Motor forward to release it. -
Page 24: Water System
MDT3F & MDT4F Water System The water system consists of the reservoir and Valve Plunger inlet water valve. 1. After the valve has been removed from the Reservoir. reservoir, remove the nut holding the valve to its mounting bracket. 1. Shut off the water supply. 2. -
Page 25: Bearings, Water Seal And Auger
MDT3F & MDT4F Bearings, Water Seal and Auger 1. Disconnect electrical power. Rotating Parts Hazard Disconnect Electrical Power Before Beginning 2. Shut off the water supply. Cap Screw 3. Remove the top panel. 4. Remove the side panels. Top Bearing 5. -
Page 26: Top Bearing Replacement
MDT3F & MDT4F Top Bearing Replacement Units from 2001 to April 2010: The top bearing was two ball bearings, one on top the other and open in Thrust between. That design is no longer available. The Washer only top bearing that can be replaced is the one pictured here. -
Page 27: Water Seal & Bottom 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
MDT3F & MDT4F 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 Temperature Pressure Chart, Selected Points procedures. Temperature in PSIG of R-134a General Service A HFC type liquid line drier is required. -
Page 29: Gear Reducer Removal
MDT3F & MDT4F Gear Reducer Removal 1. Disconnect electrical power. 8. Disconnect the water inlet tube from the evaporator. 9. Remove the three screws holding the evaporator to the adapter stand. 10. Lift the evaporator up high enough for the Electrical Shock Hazard auger to clear the adapter stand. -
Page 30: Auger Drive Motor
MDT3F & MDT4F Auger Drive Motor The windings or top bearing & cover may be If the rotor needs to be removed: replaced without removing the evaporator or gear 1. Run a screw into the top of the rotor. reducer from the machine. 2.