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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.

Содержание MDT3F

Страница 1: ...s 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 ...

Страница 2: ...performance They meet or exceed the standards of UL NSF and CUL 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 parts and of other components not specifically approved by Scotsman MDT3F MDT4F April 2010 Page 2 Specifications Model Number Dimensions W x D x H Basic Electrical Refrigerant Charge ...

Страница 3: ...reated A water filter is always a good idea but does require regular maintenance to change the cartridge In some water conditions water treatment may be required Generally this means a polyphosphate feeder of some kind Water softeners are not recommended General Installation Place the machine in its final location Remove the front top right and left side panels 1 Remove two screws at the bottom of...

Страница 4: ... 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 Replace the back panel when the electrical connections are complete MDT3F MDT4F May 2001 Page 4 FOLLOW ALL APPLICABLE LOCAL STATE AND NATIONAL CODES This Unit MUST BE GROUNDED Electrical Pow...

Страница 5: ...bing between the machine and the building drain Route the drains separately to the building drain Water supply Connect cold potable water to the machine The inlet water fitting is a 1 4 male flare located on a wall inside the cabinet A hand valve near the location is recommended A water filter is also a good idea Follow all local codes MDT3F MDT4F May 2006 Page 5 FOLLOW ALL APPLICABLE LOCAL STATE ...

Страница 6: ...ition it in line with the pre punched holes in the frame 3 Fasten the bracket to the frame with four 20 screws from the kit Top Wall Bracket 1 Hold the bracket on the wall where it will be mounted 2 Mark on the wall the positions of the holes in the bracket 3 If needed drill pilot holes for the fasteners 4 Secure the bracket to the wall with fasteners of sufficient strength to hold up the dispense...

Страница 7: ...fter about 15 seconds the machine should start 6 Let the machine operate listen for any unusual noises If needed reposition tubing panels to eliminate vibration After the unit has been operating for about 10 minutes there should be enough ice in the bin to test the dispense system 7 Using a container place in in front of the glass sensor and below the ice chute See that ice is dispensed the bin dr...

Страница 8: ...nto the container below the spout Note The water is NOT cooled it is the same temperature as the building supply water Daily Maintenance Pour hot water into the sink to flush out any debris or build up Wipe the cabinet off wash the sink and grill to keep minerals from accumulating Caution Unless the touch free sensor is de activated by pushing the Cleaning Switch in ice and or water may be dispens...

Страница 9: ... at the top and has a spout at the bottom There is a rotating ice vane inside the bin that causes the ice to be swept over the spout and dispensed The vane is rotated by a gear motor at the top of the bin Bin Cover The bin cover not only keeps dirt from the ice storage bin it also is the support for the dispense gear reducer and the location of the electric eye bin controls Condenser The machine u...

Страница 10: ...he high pressure liquid refrigerant moves into the evaporator s area of low pressure the warm water and low pressure cause the refrigerant to evaporate and absorb heat from the metal walls of the evaporator After the refrigerant has flowed thru the evaporator it goes back to the compressor thru the suction line as a low pressure vapor At the compressor the cycle is repeated System Characteristics ...

Страница 11: ...the evaporator there is a water seal This seal is the type that has a rotating half and a stationary half The area where the two seals touch are smooth flat surfaces When the auger is installed in the evaporator it forces the rotating half of the seal against the stationary half The stationary half is spring loaded and provides a firm pressure against the auger portion of the seal MDT3F MDT4F Apri...

Страница 12: ...sor will send a signal to the control board to shut down the machine Refrigeration The refrigeration system uses a hermetic compressor specifically designed for R 134a forced draft air cooled condenser capillary tube and vertical flaked ice evaporator Inside the evaporator is a slowly rotating auger The auger is supported by bearings at each end and there is a face type water seal above the bottom...

Страница 13: ...s run by the circuit board for 2 more minutes clearing out ice in the evaporator and then The auger motor no longer receives power from the circuit board and the auger motor stops After a 6 minute delay If the ice level sensor is clear bin empty for more than 15 seconds the machine will start up again Another purpose of the circuit board is to turn the machine off if there is not enough water in t...

Страница 14: ...e sanitizing solution may be obtained by mixing 1 ounce of household bleach with 2 gallons of clean warm 95o F 115o F water 13 Unplug or disconnect electrical power 14 Remove bin top pour in warm potable water to melt out any ice 15 Pull out the vane and bin bottom from the bin 16 Thoroughly wash the bin s interior bin top interior spout ice vane and bin bottom with the sanitizing solution Pour so...

Страница 15: ...l 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 Wash the splash panel and wipe with sanitizer Re ...

Страница 16: ... the evaporator and reservoir 6 Remove cap from top of evaporator 7 Remove 2 permagum plugs from the side of the evaporator 8 Remove 2 screws screwheads were covered by the permagum 9 Pull up on a Design from 2001 to 2007 The pull ring to remove the auger b Design from 2007 on Obtain a 1 1 2 pipe thread tee Install the Tee it will screw onto the breaker Pull up on the Tee or insert a bar thru the ...

Страница 17: ...te grease Grease should just cover the bearing surface Wipe out 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 Some condensation is normal however visible water may be a sign of a water seal leak 7 Reverse all of the above to reassemble Note The bottom bearing must be remove...

Страница 18: ...r The water level sensor may not shut the ice machine off when the reservoir goes dry if there is a film of mineral scale on the probe tip 1 Remove the top panel 2 Remove the reservoir cover 3 Pull the water level probe up and out of the reservoir 4 Carefully wipe the tip of the probe with a clean cloth Ice machine cleaner may be needed Note The tip is made of glass 5 Reinsert the water level sens...

Страница 19: ...eck coupling gear reducer No refrigeration Check refrigeration system Ice in bin but will not dispense Drive motor does not turn Vend system does not work Check replace vend system Check that cleaning switch has been released Dispense motor open Check replace dispense motor Dispense output shaft broken Check replace output shaft Ice in bin motor turns vane Ice jammed up Users held cup against disp...

Страница 20: ...l open Replace solenoid Vend system does not work Check replace vend system Water turned off Restore water supply Water drips from spout Melting ice in chute Some water dripping is normal Unit or bin not level Level unit check bin Water solenoid leaks thru Replace solenoid Ice jammed in spout Clear ice jam check for cause Ice will not stop dispensing Vend system does not work Check replace vend sy...

Страница 21: ...pty 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 3 Off Timer ON Unit cycling off On when water level is low in the reservoir 4 No Water ON Trouble To check the electrical system first check the lights on the circuit board 1 Remove the top panel 2 Remove the left side panel...

Страница 22: ...for voltage at the Water Sensor pins it should read about 12 volts DC If no voltage replace the controller If there is voltage replace the sensor Another check is sensor resistance the sensor normally reads about 850 ohms at 72 degrees F higher if colder and lower if warmer There is no bypass method or part that will allow operation only a good sensor will work 3 Ice is not dispensed when a contai...

Страница 23: ...drive gear motor to the bin top 6 Pull gear motor off the bin top 7 Unscrew the output shaft extension from the gear motor 8 Remove screws holding the mounting bracket to the gear motor 9 Reverse to reassemble be certain that the new wire nuts are secure and that the ground strap is reattached Dispense Vane 1 Disconnect electrical power 2 Remove top panel 3 Remove four thumb screws holding bin cov...

Страница 24: ...oir and lift the valve out of the reservoir tank 6 Replace with a new valve or replace the valve plunger Valve Plunger 1 After the valve has been removed from the reservoir remove the nut holding the valve to its mounting bracket 2 Pull out the cotter pin to release the internal valve plunger Note Do not replace the plunger if the valve s seat is damaged Replace the valve Inlet Water Valve 1 Disco...

Страница 25: ...r bolt All versions Use threaded rod or a slide hammer puller and screw into the auger slide the weight quickly up against the stop to remove the auger 9 Separate auger from top bearing a Units prior to 2007 Remove snap ring holding bearing cover to breaker a1 Remove bearing cover All units Unscrew bolt holding bearing to auger 9 Remove three cap screws holding evaporator to the adapter stand Sepa...

Страница 26: ...ter race during assembly a Cut a 1 2 length of 3 4 PVC tubing Cut it as straight as possible b Obtain a 1 1 2 long 3 8 bolt with nut and 2 flat washers c Assemble them with the new bearing as shown 7 Lube the outside of the new bearing and insert it into the top of the breaker 8 Drive the new bearing into the breaker as far as it will go Extended inner race faces up Note Use a vice as a support or...

Страница 27: ...the water seal until the bottom bearing is inside the evaporator about 1 16 6 Replace the evaporator on the adapter and re attach the stand using the original bolts 7 Attach the auger to the top bearing and breaker 8 Return the auger to the evaporator and slide it down until the splines touch the coupling 9 Rotate the auger until the coupling splines align with the auger 10 Push the auger down and...

Страница 28: ...s valves must be in the closed position before the hose caps are removed Do not remove the hose caps before checking the position of the valve Use a 3 16 allen wrench to open and close the valve As with any other refrigerant do not place pressurized air or oxygen into the refrigeration system Note The refrigeration system uses an HFC type refrigerant and MUST use an HFC type drier Evacuation to 30...

Страница 29: ...olts holding the gear reducer to the cabinet frame 12 Trace auger drive motor wires back to the control box 13 Disconnect the drive motor wires from the relay on the circuit board 14 Pull the wires back to the auger drive motor 15 Pull the gear reducer out the side of the cabinet to remove it from the machine Note If there is evidence of water near the output shaft of the gear reducer it would be ...

Страница 30: ...o a relay on the circuit board 2 Disconnect the auger motor s wires and pull them back to the auger drive motor 3 Lift the auger motor windings off the gear reducer If the rotor needs to be removed 1 Run a screw into the top of the rotor 2 Grasp the screw with a grip pliers 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 Replac...

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