Specifications

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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.

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.

MDT3F & MDT4F

April 2010

Page 1

New Table of Contents

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

Note this symbol when it appears.

It marks a possible hazard.

Summary of content (29 pages)

PAGE 1
MDT3F & MDT4F 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. 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.
PAGE 2
MDT3F & MDT4F 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: 50oF. · Maximum Air Temperature: 100oF. · Minimum Water Temperature: 40oF. · Maximum Water Temperature: 100oF. · 60 Hz voltage may vary between 104 and 126 volts. · Water Pressure may vary between 20 and 80 psi.
PAGE 3
MDT3F & MDT4F 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. This machine is air cooled and blows air out the lower left side of the cabinet. Do not install the machine where the side to side air flow might be blocked.
PAGE 4
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. Remove the back panel to make the electrical connection. The electrical connection is made on the terminal strip in the junction box inside the machine.
PAGE 5
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. There are two drains to connect: A sink drain, a 7 8” ID plastic tube; and the bin drain, a 5 8” ID plastic tube. Install rigid tubing between the machine and the building drain. Route the drains separately to the building drain.
PAGE 6
MDT3F & MDT4F Wall Mount Kit (KWB4): Contents: Top Wall Bracket: 1. Top Case Hanger Bracket: Attaches to the frame of the dispenser. 1. Hold the bracket on the wall where it will be mounted. 2. Top Wall Bracket: Mounts to the wall and engages the top case hanger bracket to support the dispenser. 2. Mark on the wall the positions of the holes in the bracket. 3. If needed, drill pilot holes for the fasteners. 3.
PAGE 7
MDT3F & MDT4F Final Check List & Initial Start Up 1. Is the machine located indoors where the temperature limitations are not exceeded? Initial Start Up 1. Remove 2 screws at the bottom of the front panel and remove the front panel. 2. Is there at least 6" clearance on both sides of the cabinet for adequate air flow? 2. Remove screws and the top panel. 3. Is the water supply adequate, and has a shut off valve been installed? 4. Is the cabinet level? 5.
PAGE 8
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. Hold it there until the container is full of ice. Do NOT overfill the container or a build up of ice in the sink or a back up of ice in the spout will occur. To Vend Ice and Water. Switch the Water Switch to ON.
PAGE 9
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. Water Reservoir. The water reservoir contains the inlet float valve and the water level sensor.
PAGE 10
MDT3F & MDT4F 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
MDT3F & MDT4F 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. The solenoid will only open if the water switch is closed and the touch free sensor initiates an ice dispense.
PAGE 12
MDT3F & MDT4F 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 oF. The ice falls thru a chute into the dispensing bin. Above the cylindrical bin is a dispense drive motor and electric eyes. The drive motor is connected to an ice vane in the bin. When the user holds a container in front of the glass sensor and below the ice chute, the dispense drive motor rotates the vane and the ice.
PAGE 13
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 switch is ON). · The compressor stops · The auger motor is run by the circuit board for 2 Switching the power on does the following: · The bin empty and power lights on the circuit board glow.
PAGE 14
MDT3F & MDT4F Maintenance: Although the ice in this dispenser is completely untouched, the water and ice vending systems will need to be periodically sanitized and de-mineralized. The air cooled condenser will also need to be kept clean. Schedule the sanitation, cleaning and de-mineralization on a regular basis to keep the ice clean and the machine operating efficiently. Sanitation and Cleaning 1. Vend all ice from the machine. 12.
PAGE 15
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. 4. The splash panel requires special attention to clean it. · Push and release the Cleaning Switch located to the left of the ice spout. This disables the Touch Free Sensor so the splash panel may be cleaned without vending ice or water.
PAGE 16
MDT3F & MDT4F Auger and Bearing Inspection While in most areas regular in-place cleaning with Scotsman scale remover 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. This physical inspection is recommended twice per year for the top bearing and once per year for the auger and both bearings.
PAGE 17
MDT3F & MDT4F Inspection: Top Bearing This procedure applies to machines produced after April 2010. 1.Shut machine off by disconnecting electrical power. 2. Remove top panel. 3. Unscrew and remove bearing sealing cap Top of Bearing Thrust Washer Sealing Cap 4. Check the top bearing. The top of the thrust washer will be visible. It should be clean, as seen in the photo. 5. Remove the bolt and thrust washer and check the bearing surface for adequate grease. Grease should just cover the bearing surface.
PAGE 18
MDT3F & MDT4F Inspection: Photo-Electric Eyes The photo electric eyes used to “see” the ice build up in the top of the bin cover must be clean to get a good “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. 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.
PAGE 19
MDT3F & MDT4F 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 · Auger does not turn · No refrigeration PROBABLE CORRECTION Check/restore power Recheck ice needs vs. machine capacity.
PAGE 20
MDT3F & MDT4F Service Diagnosis PROBLEM Unusual noise POSSIBLE CAUSE Mineral scale in evaporator Auger coupling dry Auger coupling worn No water is dispensed Water drips from spout Ice will not stop dispensing Water leaks from cabinet No refrigeration Bearings worn Gear motor loose on frame Low water level Tubing vibrating Tooth on a gear missing Compressor too loud Gear noise Water Switch in Off position Water switch open Water solenoid plugged up Water solenoid coil open Vend system does not work Wa
PAGE 21
MDT3F & MDT4F Service Diagnosis: Circuit Board 1 2 3 4 Explanation of Indicator Light On at all times when the master switch is ON and machine is connected to electrical power. Position On Board 1 Name and Meaning of Light or Reset Power, ON = Normal On when ice level is low (unit making ice). 2 Bin Empty, ON = Needs 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
MDT3F & MDT4F Removal and Replacement Panels: Dispense Vane 1. Remove two screws at the back of the top panel. 1. Disconnect electrical power. Dispense Drive Motor 2. Lift up at the back and push the top panel forward to release it. Bin Top 3. Remove 3 screws at the top, 3 screws at the bottom and 1 screw at the front edge of each side panel. 4. Push each side panel to the rear to release the panel from the cabinet frame.
PAGE 23
MDT3F & MDT4F Water System The water system consists of the reservoir and inlet water valve. Valve Plunger 1. After the valve has been removed from the reservoir, remove the nut holding the valve to its mounting bracket. Reservoir. 1. Shut off the water supply. 2. Pull out the cotter pin to release the internal valve plunger. 2. Remove the top panel. 3. Remove the right side panel. Note: Do not replace the plunger if the valve’s seat is damaged. Replace the valve. 4.
PAGE 24
MDT3F & MDT4F Bearings, Water Seal and Auger 1. Disconnect electrical power. Rotating Parts Hazard Disconnect Electrical Power Before Beginning Cap 2. Shut off the water supply. Cap Screw 3. Remove the top panel. 4. Remove the side panels. Top Bearing Set 5. Drain the reservoir and evaporator. Breaker Screws 6. Remove cap from the top of the evaporator. Breaker 7. Remove the two permagum plugs from the side of the evaporator. 8.
PAGE 25
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 between. That design is no longer available. The only top bearing that can be replaced is the one pictured here. It has a gray plastic cap. The prior versions either had a brass cap or a white plastic cap. Existing prior versions require an auger kit to replace the bearings. Thrust Washer Thrust Bearing Roller Bearing 1.
PAGE 26
MDT3F & MDT4F 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. 3. Wash the new seal in water. While wet, slip it onto the bottom of the auger, rubber side toward the auger. Push up until seated against the sealant.
PAGE 27
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 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. The time that the refrigeration system is open to the air must not exceed 15 minutes.
PAGE 28
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. Electrical Shock Hazard Disconnect electrical power before beginning. 10. Lift the evaporator up high enough for the auger to clear the adapter stand. 11. Remove the mounting bolts holding the gear reducer to the cabinet frame. 12. Trace auger drive motor wires back to the control box. 2.
PAGE 29
MDT3F & MDT4F Auger Drive Motor The windings or top bearing & cover may be replaced without removing the evaporator or gear reducer from the machine. If the rotor needs to be removed: 1. Disconnect electrical power. 2. Grasp the screw with a grip pliers. 1. Run a screw into the top of the rotor. 3. Pull and/or tap on the pliers to pull the rotor & bearing out of the gear reducer. 4. Inspect the bearing and input seal. Replace them if worn.