Table of Contents
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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: Auger · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 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
Bearing Replacement: · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 25
Refrigeration System · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 26
Gear Reducer Removal · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 27
Auger Drive Motor · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 28
Parts Lists and Wiring Diagrams are printed on
yellow paper in the center of this manual.
This manual was printed on recycled paper. Keep it
for future reference.
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
May 2001
Page 1
MDT3F & MDT4F
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Table of Contents
Related Manuals for Scotsman MDT4F12
Summary of Contents for Scotsman MDT4F12
- Page 1 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: ·...
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Page 2: Specifications
Specifications: Scotsman ice machines, like the MDT3F or MDT4F, are designed to be installed indoors, in a controlled environment. The minimum and maximum operating conditions are: · Minimum Air Temperature: 50 · Maximum Air Temperature: 100 · Minimum Water Temperature: 40 ·... -
Page 3: To The Installer
To The Installer: A professional installation of any product is critical to the long term satisfaction of the user. The ice maker-dispenser is designed to be installed either on a counter, or, using a wall hanging kit, hung from a wall. Determine the location from the anticipated use and any options planned for. -
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
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)
Wall Mount Kit (KWB4): Contents: 1. Top Case Hanger Bracket: Attaches to the frame of the dispenser. 2. Top Wall Bracket: Mounts to the wall and engages the top case hanger bracket to support the dispenser. 3. Bottom Wall Bracket: Mounts to the wall and spaces the base of the dispenser away from the wall. -
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
Refrigeration System Operation Both the MDT3F and the MDT4F use a forced draft condenser, capillary tube and hermetic compressor. The system uses R-134a as a refrigerant. High pressure, high temperature refrigerant is forced thru the condenser where it looses enough heat to condense. The high pressure liquid refrigerant then passes thru the capillary tube which causes a pressure drop in the evaporator. -
Page 11: Water System Operation
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 12: Mechanical Operation
Mechanical Operation General: The machine 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 13: Electrical Sequence
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 switch to ON does the following: ·... -
Page 14: 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 15: Dispense Area Sanitation
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 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 17: Inspection: Auger
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 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
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 ·... - Page 20 Service Diagnosis PROBLEM Unusual noise No water is dispensed Water drips from spout Ice will not stop dispensing Water leaks from cabinet No refrigeration POSSIBLE CAUSE Mineral scale in evaporator Auger coupling dry Auger coupling worn Bearings worn Gear motor loose on frame Low water level Tubing vibrating Tooth on a gear missing...
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Page 21: Service Diagnosis: Circuit Board
SERVICE DIAGNOSIS: Circuit Board Explanation of Indicator Light On at all times when the master switch is ON and machine is connected to electrical power. On when ice level is low (unit making ice). Normal 6 minute off/delay start. To prevent short cycling, the machine will not restart after any shut off (except power to the board) until 6 minutes have passed. -
Page 22: Removal And Replacement
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 23: Water System
Water System The water system consists of the reservoir and inlet water valve. Reservoir. 1. Shut off the water supply. 2. Remove the top panel. 3. Remove the right side panel. 4. Drain the water reservoir and evaporator. 5. Disconnect inlet and outlet tubes from the reservoir. -
Page 24: Bearings, Water Seal And Auger
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. 6. Remove foam cap from the top of the evaporator. -
Page 25: 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 26: Refrigeration System
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” driers may not take out enough moisture and may affect the oil additives. -
Page 27: Gear Reducer Removal
Gear Reducer Removal 1. Disconnect electrical power. Electrical Shock Hazard Disconnect electrical power before beginning. 2. Shut off the water supply. 3. Remove the top and side panels. 4. Remove the control box cover. 5. Remove the centrifugal switch cover on the top of the auger drive motor. -
Page 28: Auger Drive Motor
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. 3.