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Bunn ITB, Technical Training Manual

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Bunn ITB Technical Training Manual Download Page 12

Unit Objectives

U

nit

 3  M

achine

 c

oMposition

Given a realistic scenario in which the learner has access to the machine’s internal components the learner 

will understand the composition and functions of the brewer.

 Given a realistic scenario requiring the learner to access the internal components of the machine the  

 learner will be able to remove rear panel and top panel.

  

The learner will remove the rear panel and top panel.

  

 Given an operating 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 .

  

The learner will be able to identify the components and functions of the filling system.

  

The learner will be able to identify the components and functions of the heating system.

  

The learner will be able to identify the components and functions of the dispensing system.

  

The learner will be able to identify the components and functions of the dilution system.

Summary of Contents for ITB

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Page 2: ...fault Values 11 Unit 3 Machine Composition Exterior Overview 13 Product Outlets and Removable Parts 13 User Interface 13 Accessing the Inside of the Brewer 13 Machine Function and Operations 13 Main Control Board 13 Filling System 14 Heating System 14 Dispensing System 14 Dilution System 15 Unit 4 Preventive Maintenance Preventive Maintenance 17 Draining the Tank 17 PM Steps 17 Unit 5 Troubleshoot...

Page 3: ...or Given a new machine 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 The learner will be able to hook up the electrical supply ...

Page 4: ...to the cold water supply Water pressure 20 90psi Minimum water flow of 1 00GPM Electrical 120VAC 120VAC 2 wire plus ground L1 neutral ground 15 amp dedicated circuit breaker plug and receptacle Receptacle within 5 feet of the machine Location of the Serial Number The machine s serial number is located on the data plate which is adhered to the front panel below the dilution nozzle The complete seri...

Page 5: ...the On position When the machine is turned on it will begin to fill the tank After the tank fills the machine will automatically begin the heating cycle This will take approximately 20 minutes Once the water temperature has reached the programmed Brew Lockout temperature it will display the ready screen The machine will continue to heat until it reaches its programmed shut off temperature PLEASE W...

Page 6: ...alled 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 power on the machine The learner will be able to access and scroll through the programming options The learner will be able to perform the calibrations The learner will be able to assign recipe The learner will be able to modify recipe ...

Page 7: ...lay during programming To exit the programming mode at any time press and release the ON OFF button located on the user interface The display will return to the main screen Programming Lockout Dip switch number 4 locks out the memory and constant value change is not possible The program menus are then used as read only status without saving any changes The dip switch is located top left side of th...

Page 8: ...ewer by writing the ad using the programming commands This message will be displayed when the brewer is not in use This function allows the operator to enable the sanitation function and set the time be fore a cleaning alert will be displayed This function allows the operator to enable the Energy Savings mode function and set the idle time Once the set idle time has expired the operator can choose...

Page 9: ...ings Calibrating the Sprayhead Flow Rate Step 1 Place a measuring container with a minimum capacity of 60 ounces beneath the funnel of the brewer Water can also be dispensed into the server and then into the measuring container Step 2 Press and hold the right hidden switch to enter level 2 programming Continue to press the right hidden switch until the display reads Calibrate Flow Step 3 Press YES...

Page 10: ...a brew switch in order to brew a batch of tea The machine will have a total of six recipes in the Recipe list Iced Tea Other Tea Green Tea Sweet Tea Flavored Tea and Iced Coffee When you select yes for Assign Recipe menu the machine will prompt set up menus for each of the brew switches starting with A and end with brew button C Procedure to Select Switch Recipes Step 1 Press and hold the right hi...

Page 11: ...tea concentrate Dilute Delay Amount of time allowed for tea to steep before introducing the dilute water Pulse Brew Routine of delivering hot water over tea in segments within the brew ounces Drip Time Countdown of time after a brew cycle to inform the operator status of funnel Factory Default Values Brew Lockout Disabled Set Language English Units English Master Temp 205º Ready Degree 5º Enable A...

Page 12: ... will remove the rear panel and top panel Given an operating 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 The learner will be able to identify the components and functions of the filling system The learner will be able to identify the components and functions of the heating syste...

Page 13: ...ackwards through the function list while in programming mode C D E Brew A B C and Function When the ON OFF is ON and the brewer is on the main screen not in programming mode momentarily press ing and releasing this pad will begin a brew cycle These are also used to program the brewer when in the programming mode F On Off Switch Pressing the ON OFF pad will alternately turn the brewer on and off Pr...

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 120VAC dual solenoid inlet valve Flow control Fill probe and CBA Water enters the rear of the brewer from the supply line and first goes through a plastic strainer mounted in the combination inlet solenoid dilution solenoid assembly From the solenoid valve the wa...

Page 15: ...rol Tea brewing can be programmed with pulse brew routines The control board will open and close the dispense valve multiple times during the brew cycle Anytime a recipe is set to a brew value of 86 ounces and higher will result in a constant value pulse routine 30 15 15 This will prevent the possibility of the funnel from overflowing The tea brew funnel will have a small outlet restrictor to faci...

Page 16: ...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 17: ... bottom end of the fill line to the flow control and remove the line from the check valve Step 4 Place the water line over a sink or bucket and remove the hose clamp to allow the tank to drain PM Steps Step 1 Disassemble and clean the strainer assembly Use Channel lock pliers to remove the flare to hose thread adapter fitting from the water inlet assembly Use needle nose pliers to gently pull the ...

Page 18: ...e hose clamp that secures tubing to the tank dispense outlet fitting Removal of the tank lid may be required depending upon the severity of the mineral build up Remove silicone hose from tank fitting Clean inside of tank fitting of any mineral build up Reassembly is the opposite of disassembly Step 6 Rebuild the dispense solenoid Remove the hose clamps that secure the tubing to the valve Remove th...

Page 19: ...ly The faucet cleaning procedure requires a 3 compartment sink Thor oughly wash all faucet parts in a mild detergent and water solution in the first sink Rinse the parts in hot water in the second sink Sanitize the parts for one minute in 75 F warm chlorine solution 50 100 ppm in the third sink Do not use full strength bleach but a solution with water of 50 100 ppm of chlorine Reassemble the fauce...

Page 20: ...to normal operation Given a machine displaying an error message all the necessary tools and safety equipment the learner will be able to diagnosis the problem Given a list of error messages and issues the learner will be to identify the probable cause of the message or issue Given a brewer with a defective component the learner will be able to test the component to deter mine the cause of the defe...

Page 21: ...s supplies voltage to load components in the brewer Switches Tests the inputs from the membrane switch Test Outputs The following load components can be tested individually Brew Valve Rectified within the coil Dilution Valve Funnel Lock Refill Valve Tank Heater Relay Tank Heater Triac Brew Valve Test Procedure Step 1 Enter Service Tools and select Yes Enter Test Outputs and scroll to Brew Valve te...

Page 22: ...will allow the brewer to operate under various water conditions The level probe senses the water level in the tank by the conductive 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 conduc tive enough to ground the circuit A low reading 0 2 indicates the probe is grounded Left side is the actua...

Page 23: ...rpose of the triac map is to identify triac in relation to the load component Triac can be blown burnt and short ed on the CBA The triac map will guide you in the replacement of the CBA prior to checking and replacing the load component which caused the triac failure on the CBA 1 TH1 Left Dilution 2 TH2 Refill Inlet Water 3 TH3 Brew 4 TH4 Right Dilution 5 TH5 Funnel Lock 6 TH6 Sweetener 7 TH7 Heat...

Page 24: ...ve 155VDC non activated 1 0VDC Activated Thermistor Voltage Range 1 0 5 0VDC Dependent Upon Temp Resistance Resistance Check the Following Components Tank Heater 8 6 Ohms and Infinite to Ground Chasis Thermistor 32º F at 32651 Ohms 70º F at 11864 Ohms and 205º F at 761 Ohms Dual Valve Coils 1130 Ohms Transformer supplies the low 12VAC to power the main control board Primary Side Black and White wi...

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