Bunn My Cafe AP Technical Training Manual Download Page 2

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Index

Unit 1: Installation

Site Requirements ..............................................................................................................4

Location of the Serial Number ..........................................................................................4

Water Supply Install ...........................................................................................................4

Initial Start-Up .....................................................................................................................5

Unit 2: Setup

User Interface ......................................................................................................................7

Switch/Display Board and Decal Button Layout .......................................................7

Operation ......................................................................................................................7

Programming Lockout Switch ...........................................................................................7

Programming Menus ..........................................................................................................8

Calibrating Flow Rate .........................................................................................................10

Coffee Brewing ...................................................................................................................11

Unit 3: Machine Composition

Exterior Overview ...............................................................................................................13

Accessing the Inside of the Brewer ..................................................................................13

Machine Function and Operations ....................................................................................14

Main Control Board ......................................................................................................14

Filling System ...............................................................................................................14

Hot Water Dispense .....................................................................................................15

Brew Dispense .............................................................................................................15

Heating System ............................................................................................................16

Ejector Assembly .........................................................................................................17

Unit 4: Preventive Maintenance

Preventive Maintenance .....................................................................................................19

PM Steps .............................................................................................................................19

Unit 5: Troubleshooting

Service Tools ......................................................................................................................23

Test Outputs .................................................................................................................23

Index Motor ...................................................................................................................24

Set Refill Threshold

.....................................................................................................25

Level 3 Programming .........................................................................................................25

Warning Messages .............................................................................................................26

Error Messages ...................................................................................................................26

Tank Draining ......................................................................................................................27

Index Motor Alignment Procedure ....................................................................................28

Index Motor Assembly Removal .................................................................................28

Index Motor Assembly Replacement .........................................................................28

Triac Map .............................................................................................................................29

Symptom Reference Guide ................................................................................................29

Rev. B

Summary of Contents for My Cafe AP

Page 1: ...BUNN TECHNICAL TRAINING My Cafe AP ...

Page 2: ...achine Function and Operations 14 Main Control Board 14 Filling System 14 Hot Water Dispense 15 Brew Dispense 15 Heating System 16 Ejector Assembly 17 Unit 4 Preventive Maintenance Preventive Maintenance 19 PM Steps 19 Unit 5 Troubleshooting Service Tools 23 Test Outputs 23 Index Motor 24 Set Refill Threshold 25 Level 3 Programming 25 Warning Messages 26 Error Messages 26 Tank Draining 27 Index Mo...

Page 3: ...ne all the necessary tools and safety equipment the learner will be able to install the brewer without error The learner will be able to verify that the site requirements have been met The learner will be able to locate and document the serial number The learner will be able to hook up the water supply to the My Caf é AP The learner will be able to power up and perform the initial set up of the br...

Page 4: ...lose to the ma chine between the backflow preventer and the machine Electrical 120VAC 2 wire plus ground Dedicated 15Amp circuit breaker Receptacle within 5 feet of machine Location of the Serial Number The machine s serial number is located on the data plate which is located on the lower front panel behind the waste bin and drip tray The serial number half tag can be found on the inside of the ma...

Page 5: ...or switch and close door by pressing the same switch Step 6 Press the large Brew Switch Water will flow into the cup When finished discard contents of cup Step 7 Water volumes and flow settings have been preset at the factory Refer to adjustments for the Set Brew Vol umes section of this manual should the volume need to be increased or decreased 8 The brewer is now ready for use in accordance with...

Page 6: ...ut error Given an installed machine all the necessary tools and safety equipment the learner will be able to set the machine up for initial operation The learner will be able to operate the switch controls The learner will be able to enter programming The learner will be able to perform the brew inlet flow calibration The learner will be able to perform a brew process ...

Page 7: ...This switch can be set to prevent access to the programming settings of the brewer Once all the cor rect brew settings are programmed the operator can set the switch to the On position to prohibit anyone from changing the settings With the switch in the On position the programming menus can still be accessed to view the current settings However no changes will be saved To access the lockout switch...

Page 8: ...et Password 001 999 Program any 3 digit number as a password Set Language Chose between English or French Units Chose between English Oz ºF or Metric Ml ºC Set Temp Adjust tank temperature 185º F to 205º F 85º C to 96º C Set Ready Sets the minimum temperature allowable to start a brew cycle If BREW LOCKOUT is en abled Range 2º F to 20º F or 2º C to 10º C below the set temperature Hot H2O Lockout P...

Page 9: ...an ounce adjustment menu for entry of ounces delivered during test New ounces entered in menu will calculate the number of flow counts needed to deliver 10 ounces Flow Counts 10 oz Informational and adjustable menu displaying the calibrated flow count number in relation to a 10 ounce dispense Number of Ejects Option of setting how many times the brewer tries to eject coffee pod after a brew cycle ...

Page 10: ...nce set temperature has been achieved the machine will display messages to prompt the user to do the following Step 6 The machine will repeat step 3 the flow countdown dispense routine Measure the captured hot water in ounces Step 7 The machine will display the following menu after the second dispense routine Use the or buttons on the switch pad to enter the amount of ounces captured in your gradu...

Page 11: ... the Open Close switch to close the pod door The following menu screens will prompt you to close the pod door and select a brew size Step 5 After selecting large or small brew the menu screens will scroll brewing messages during the brew process and inform you when brewing is complete The system will automatically dispense the pod into the pod bin reset back to standby position and be ready for ne...

Page 12: ...erating machine the learner will be able to give a general explanation of how the unit operates The learner will be able to identify the functions of the main control board and identify the components that correspond to each triac The learner will be able to identify the components and functions of the fill system The learner will be able to identify the components and functions of the hot water d...

Page 13: ...ove the two screws from the top cover of the unit Lift the top cover up and away from the unit Step 3 Move to the rear of the unit and remove the six standard screws securing the back panel Pull the panel back and away from the unit Step 4 Return to the front of the unit and pull the drip tray and pod bin out and set aside Step 5 Remove the black plastic door bezel by lifting upward and set aside ...

Page 14: ...f of the tank during a brew cycle or from the hot water outlet the fill circuit activates to refill the tank The fill system consists of A Fill Probe B Tank C 120VAC inlet valve with outlet flow restrictor Water enters the rear of the brewer from the supply line and first goes through a plastic strainer mounted in the inlet valve assembly The CBA will activate the fill valve and allow water flow p...

Page 15: ...ted by an orifice located in the outlet of the fill valve The regulated water passes through a flow meter and travels to the top of the tank and connects to a fill tube that is held in place with a grommet The fill tube is approximately 6 inches in length going into the tank The tank will fill with water to the refill probe level and will heat to the set temperature When a user presses the momenta...

Page 16: ...rd with Hybrid Heating Components F Vent Valve The vent valve is located above the water tank and is normally open to allow venting during heating The heat ing element is protected when the brewer is powered on to prevent dry firing of the tank element which occurs when there is no water in the tank The fill probe must be satisfied with water before the CBA activated the heating element Once the f...

Page 17: ...ation 17 A B C D E F Ejector Assembly Ejector assembly consists of A Housing B Brew head assembly with check valves C Pod holder assembly with linkage D Pod screen assembly E Index motor with position disc F Index sensor ...

Page 18: ...Brew Cycle Step 1 Depress the open close button and pod holder rotates outward to coffee pod load position Step 2 Depress the open close button and the pod holder rotates back in and stops in the brew position under sprayhead assembly Step 3 After brewing is complete the pod holder rotates further back and down to coffee pod eject position Note The coffee pod eject has an option of making a single...

Page 19: ...hine requiring a preventive maintenance the learner will be able to identify which elements of a component need to be serviced without error Given a machine all the necessary tools and safety equipment the learner will be able to identify the components that need to be serviced for the PM ...

Page 20: ... the water and electrical supply Assess placement of brewer to perform PM process Allow brewer tank time to cool down Remove top cover and rear panel 6 Month PM Steps Step 1 If customer has a BUNN water filtration system installed before the brewer replace the filter or filter cartridge and purge before installing to the brewer Write next change date on filter decal Step 2 Clean sprayhead Enter Se...

Page 21: ... blade screwdriver in the seam and pry up to remove bowl cap Use clean wash cloth to clean cap and lower stream guide bowl Insert 26367 0000 cleaning brush from the underside into the coffee outlet hole rear and work back and forth Reinstall bowl cap by aligning the tab and notch then put back into position Remove the object holding the door open and return the pod drawer back to home position by ...

Page 22: ...ature and fill sensor Use a solution called Dezcal to help dissolve the scale from the sensors Follow the directions outlined by the product manufacture Note Do not submerse the temperature sensor wires or use any abrasive material to help assist the removal of lime scale from any metal surface Pump and hot water silicone pickup tubes The pickup tubes are flexible enough to squeeze and break up mi...

Page 23: ... to access the programming menu The learner will be able to navigate to the Service Tools menu The learner will be able use the Service Tools menu to test inputs or outputs The learner will be able use the Test Switches menu for testing Given a list of error and warning messages the learner will be able to explain the error and warning messages Given a realistic scenario requiring diagnosis and th...

Page 24: ...before removing any panel Step 2 Access the rear of the machine Step 3 Remove the rear panel by removing six standard screws On Position Locked The following menu screens will appear to inform you that programming is locked but still can be accessed to view current settings Service Tools To access SERVICE TOOLS enter Level 1 Programming without lockout switch activated Once the BREW LOCK OUT menu ...

Page 25: ... signal operation of the flow meter Drain the tank partially be fore testing of the water inlet by turning off the water supply and activating the hot water dispense Once the partial draining of the tank is complete turn the water supply back on before continuing with the flow meter test Access the Water Inlet xxx test screen Activate the water inlet and watch the flow count number to increase at ...

Page 26: ...s can have different conductivities By adjusting range 20 230 the sensitivity of the refill circuit this will allow the brewer to operate under various water conditions The level probe senses the water level in the tank by the conductance of minerals in the water grounding out the very low AC voltage applied to the probes A high reading approximately 255 indicates water is not touching or not con ...

Page 27: ...pods cause brewing issues BREW SEAL WARNING Sets the count number for REPLACE SEAL message WATER PUMP POWER 100 FACTORY USE ONLY DO NOT ADJUST CAL TEMPERATURE NO SENSORS YES CALIBRATE TEMPERATURE PROBE Press YES to access the calibration screen LEVEL 3 2nd THERM FAULT DISABLE ENABLE FACTORY USE ONLY DO NOT ADJUST Level 3 Programming Access level 3 programming menus by pressing and holding the hidd...

Page 28: ...g by following the screen prompts to reset error fault erase or you will need to fix the problem and the machine will automatically reset the error fault This message appears if the control board loses contact with the temperature sensor or senses shorted connection The heater relay has been activated for more than 6 minutes This message appears if the flow meter has not metered any pulses or flow...

Page 29: ...grammed value is raised and lowered depending on the last successful closing of the drawer The Path Clear message comes up when the self programmed value 1 amps for 20ms one thousandth of a second has been exceeded How to Drain the Hot Water Tank Step 1 Disconnect the power and water supply to the brewer Allow the brewer to cool before proceeding Step 2 Remove 6 screws securing the rear panel Remo...

Page 30: ...1 Step 5 Install the motor assembly and ensure the mounting nuts are snug Step 6 Verify that the door assembly is open Tighten the Allen screws with 3 32 Allen wrench Move drawer back and forth to find center of flats on shaft when tightening Allen screws Note Do not tighten Allen screws until the motor bracket is secure against the ejector wall Step 7 Install puck into pod holder Fig 2 2 Step 8 R...

Page 31: ...t Used Red Wire TH3 Symptom Reference Guide No Heat Tank Heater Limit Thermostat Temperature Sensor CBA Over Heating Steaming Temperature Sensor CBA No Refill Main Water Source Inlet Valve Fill Circuit Grounded CBA Water Flow Path Restricted flow meter or tank fill tube Problem Probable Cause 1 2 3 4 ...

Page 32: ...estricted Hot Water Pickup Tube CBA Excessive Water or Coffee in Drip Tray Air pump not working pods soaked Not blown out correctly Air time set too low Leaking sprayhead seal Stream guide plugged Brewer over heating Pod Door Partially Open Index Motor Misaligned During Brew Position Sprayhead loose Failed motor Brew Volume Incorrect or Inconsistent Flow meter Calibration is Off Brew volume set in...

Page 33: ...Online Learning Center you can download a QR Reader application for your SmartPhone Download QRReader Application for your SmartPhone Open the QRReader application on your SmartPhone Aim your SmartPhone Camera as if you are taking a picture of the QR code image image on the right The QRReader Application will direct you to the BOLC where you will have access to many resources relating to BUNN beve...

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