Bunn JDF Silver Series, Technical Training Manual

Page 1: ...BUNN TECHNICAL TRAINING JDF Silver Series ...

Page 2: ... P H Buttons 8 Portion Control P C Membrane Button 9 Unit 3 Machine Composition Exterior Overview 11 Product Outlets and Removable Parts 11 User Interface 11 Product Cabinet 11 Accessing the Inside of the Machine 12 Removing the Door Cover 12 Machine Function and Operations 12 Electronic Group 12 Door Assembly 14 Refrigeration System 14 Cabinet Cooling 15 Water Tank Assembly 16 Water Delivery 16 D...

Page 3: ...and safety equipment the learner will be able to install the dispenser without error The learner will be able to verify that the site requirements have been met The learner will be able to prepare the machine for install The learner will be able to install the outer door cover The learner will be able to hook up the water supply The learner will be able to install the air filter The learner will b...

Page 4: ... all the parts Step 3 Place the machine in the desired location on the counter Step 4 Document the complete serial number of the machine Install Outer Door Cover Step 1 Connect the ribbon cables from the door cover to the control board When connecting the ribbon cables ensure that the number on the cable is at the top of the ribbon For models without the portion control option you will only need t...

Page 5: ...e overflow tube Then press the dispense button again to stop the fill process NOTE The fill timer may time out before filling is complete Press and hold the dispense button for 10 seconds to start again if needed Step 7 Turn ON the refrigeration switch near the main control board This will start the water bath pump circulation Step 8 Check water level in the overflow tube and top off the tank if n...

Page 6: ...ools and safety equipment the learner will be able to set the machine up for initial operation The learner will be able to load the product The learner will be able to prime the pumps The learner will be able to perform a water flow test and adjustment The learner will be able to perform a total dispense test The learner will be able to perform a pump speed adjustment The learner will be able to s...

Page 7: ...he free end of the Convertible Tube Assembly s concentrate tube through the openings in the refrigerated compartment and dispenser rear panel Take care to route Tube Assemblies so they won t kink or interfere with the condenser fan Step 6 Connect the concentrate container to the free end of the concentrate tube protruding from the dispenser s rear panel Step 7 Insert the Adapter end of the Convert...

Page 8: ...nse Switch three times On Portion Control models use the plus stop switches Step 3 The selected position will dispense water no concentrate only for 3 seconds Step 4 Measure the water dispensed Step 5 Adjust the water flow rate with a 1 4 allen wrench clockwise to increase flow rate counterclockwise to decrease flow rate to the corresponding product mix ratio as follows Maximum flow rate may be le...

Page 9: ...decreasing the pump speed will have the opposite affect Note Some 2 S models will have 4 adjustment knobs on the circuit board For these models use the two left most knobs to make a pump speed adjustment Step 5 Reinstall the splash panel and drip tray then reconnect the dispenser to the power source Set the Portion Control Option The product dispense buttons for machines using mechanical buttons o...

Page 10: ... 44 3 30 3 21 3 14 3 09 306 3 03 3 00 2 98 2 96 2 95 2 93 3 0 4 50 4 00 3 75 3 60 3 50 3 43 3 38 3 33 3 30 3 27 3 25 3 23 3 21 3 20 3 25 4 88 4 33 4 06 3 90 3 79 3 71 3 66 3 61 3 58 3 55 3 52 3 50 3 48 3 47 3 5 5 25 4 67 4 38 4 20 4 08 4 00 3 94 3 89 3 85 3 82 3 79 3 77 3 75 3 73 3 75 5 63 5 00 4 69 4 50 4 38 4 29 4 22 4 17 4 13 4 09 4 06 40 4 4 02 4 00 4 0 6 00 5 33 5 00 4 80 4 67 4 57 4 50 4 44 ...

Page 11: ...to access the internal components of the machine the learner will be able to remove panels 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 major components in the machine and describe their functions The learner will be able to explain how the components work in relation to the system The learner will b...

Page 12: ...cated on backside of splash panel Cold Water Nozzle option only available JDF 4S User Interface The user interface allows the customer to dispense a beverage Product Cabinet This houses the product and keeps it cool by maintaining a cabinet temperature range of 35º to 41º F If the customer wishes to use ambient concentrates you will have to install the optional Ambient Concentrate Conversion Kit A...

Page 13: ...away from the dispenser Removing the Door Cover The door cover may be removed if you need to gain access to the lighting circuit switches switch board or membrane switches Step 1 Disconnect unit from power source Step 2 Remove the 5 screws securing the door cover to the door assembly Step 3 If unit uses a membrane switch disconnect the 6 pin connectors from auxiliary switch board If the unit uses ...

Page 14: ...ontact terminal waiting to pass on The relay coil K1 will receive 120VAC from the main control board after a 6 minute delay from initial plug in and energize closing the relay contacts With the contacts closed 120VAC will pass across the contact and onto the compressor limit thermostat and energize the compressor start and run winding Control Board Assembly CBA E The CBA is powered by receiving 24...

Page 15: ...down transformer and converts the 24VAC over to 24VDC before going on to the door light ballasts rated at 24VDC Door Assembly The door gasket is mounted and foamed in place to the inner door Early models with fluorescent lamps may contain one or two ballasts mounted on the inner door panel or the latest version being LED lighting See BUNN service bulletin 175 about converting fluorescent lighting ...

Page 16: ... have a six minute delay starting the compressor The delay ensures enough allowable time for the start relay PTC resistance to decrease to complete the start wind ing path for initial start up and refrigerant high and low pressure to stabilize Cabinet Cooling First the refrigeration system creates an ice block around the evaporator coil in the bath tank The top load recircu lating pump is mounted ...

Page 17: ...f for a period of 48 hours for the ice block to thaw After thaw remove sight gauge tube from retaining clip and lower the tube below tank level and the tank will begin drain ing water out of the sight gauge tube Water Delivery When a user depresses a button or membrane on the door an input signal is sent to the CBA In return the CBA will send out the corresponding output to turn on the water inlet...

Page 18: ...on the CBA The potenti ometers range from 9 0 to 25 0 VDC The advantage to modular dispense platforms is removal and ease of service High Intensity Dispense Valve The water entering the rear of the dispense valve is coil activated or energized 24VDC to let the regulated water flow travel down the stem and out the narrow slot as the concentrate enters the valve body and the High Intensity mixing te...

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: ...t side panel PM Steps Step1 Remove inlet valve connector fitting and clean inlet valve strainer Using your hand and unscrew the valve adapter fitting and set aside Using the needle nose pliers gently grab the strainer tab and pull the strainer out of the valve Clean and rinse strainer of any sediment or mineral build up Re installation is the opposite of removal Step 2 Replacement of lamp in light...

Page 21: ...nections Replace the dispense platform cover Turn power on to dispenser Install containers of rinse water run each station and check for leaks Repair leaks as necessary Replace product shelf and product containers Reconnect any connections to ambient product containers Prime the pumps Step 6 Follow the daily parts washing procedure in the operating manual Remove and wash the dispense nozzle s mixi...

Page 22: ...l dispense decreasing the pump speed will have the opposite affect Step 5 Conduct the total dispense test to determine if more of an adjustment is needed If no further adjustments are required turn OFF the program switch and re install the lower splash panel Temperature Compensated Refractometer Method Step 1 Adjust the water flow as described in Water Flow Test and Adjustment Step 2 Place an empt...

Page 23: ...penser having a fault condition all the necessary tools and safety equipment the learner will be able to diagnose the symptom to the actual problem The leaner will be able to access the fault indicators The learner will be able to correlate the fault code to the symptom Given a dispenser with a malfunction the learner will be able to effectively troubleshoot the malfunction and diagnose it as a re...

Page 24: ... flash 2 and 3 LED s 2 times every 3 seconds The compressor will not run under this condition 2 Bath Green When bath temperature is below 34º F 3 Green When the compressor should be On 4 Cabinet Red When the cabinet temperature is above 50º F Flashes slowly when cabinet temperature exceeds 50º F for 4 hours Dispense functions are locked out under this condition Power down the dispenser to reset Fl...

Page 25: ...oubleshooting the control circuits No Determine pump motor is getting its 120VAC supply when the refrigeration switch is turned on 120VAC present Replace recirculating pump assembly 120VAC not present Defective switch or loose wire connection in circuit Step 2 Bath thermistor can be out of range and cause frozen bath Thermistor frozen in ice must read 31 K ohms or greater and will be approximately...

Page 26: ... be needed to check for low refrigerant charge or locked rotor com pressor which create open circuits identified in step 4 No Manually depress the test contact button on the side of K1 compressor relay and see if compressor starts Yes 120VAC must be present after 6 minute delay from power up across K1 relay coil replace the compressor relay No 120VAC is not present after 6 minute delay after power...

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