Bunn JDF S Series Instructions for use

JDF S Preventive Maintenance
In order to maintain proper operation and long service life BUNN recommends performing the preventive mainte-
nance every 6 months. Individual customers will vary with some customers choosing not to receive preventive main-
tenance. Some of the PM items may require more frequent maintenance depending on the site conditions.
Tools Required:
Flat blade screwdriver•
8 inch crescent wrench (2)•
Needle Nose Pliers•
Velcro Tape•
Graduated measuring cup•
Refractometer•
Thermometer•
Flashlight•
5 gal. bucket•
Tube PM Kit BUNN PN: 39690.0000 (1 per dispense station)•
Kay-5 Sanitizer (50 Count BUNN P/N: 24634.0001) (200 Count BUNN P/N: 24634.0000)•
BUNNrellablecontainer(BUNNP/N:39302.0000)•
Condenser Cleaner•
Rubber gloves•
Safety goggles or face shield•
Fin Comb•
Mild non abrasive detergent and cloth•
Vacuum with soft brush attachment•
Prior to servicing the brewer:
Sanitize the dispenser before you begin the preventive maintenance process.•
Disconnect the water and electrical supply.•
Assess placement of dispenser to perform PM process.•
Check and make sure you have the necessary safety equipment of cleaning the condenser.•
Remove the lower splash panel.•
Remove the right side panel.•
PM Steps
Step1:Removeinletvalveconnectorttingandcleaninletvalvestrainer.
Usingyourhandandunscrewthevalveadaptertting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 lighted door assembly.
Usingaatbladescrewdriver,removethevescrewssecuringtheouterdoorcovertotheinnerdoor.□
Disconnect the door switch connector or connectors from the auxiliary switch CBA and set door cover aside.□
Gently grab the failed lamp and rotate half turn until lamp connection studs are aligned up with lamp socket□
opening and remove lamp.
Re-installation of new lamp is the opposite of removal.□
Step3:Removeandcleanthemeshairlter.
Usingyourhand,grabthemeshltertrianglehandleandpulltheairlterfromthedispenser.□
Washtheairlterinwarmsoapywateranddry.□
Usingaashlight,shinethelightthroughthecondensertocheckfordirtbetweenthens.Inspectcondenserns□
for straightness. Go to the next step of Cleaning the Condenser.
InspectVelcrostrapsforadhesiontoairlteranddispenserandbereadytoreplaceaftercleaningofthe□
condenser.
Rev. 05/19/09

Step 4: Cleaning the condenser.
Usingasoftcleaningbrushattachment,gentlyvacuumthecondensercoilns.□
Usingaashlight,shinethelightthroughthecondensernstore-checkforcleanlinessordirtbetweenthens.□
Heavy build-up of grease in the condenser may require the use of a commercial condenser cleaner.□
Follow the manufacture warning and safety instructions along with how to instructions supplied with the cleaner.□
Step 5: Replacing the peristaltic pump tubing.
Open dispenser door.□
Removeallproductcontainersandplacetheminarefrigerated,(35-40ºF[1.6-4.4ºC]),environment.Disconnect□
all connections to ambient products from the bottle adapter.
Rinse all dispense stations using steps outlined in “DAILY RINSE PROCEDURE” in the operating manual.□
Disconnect dispenser from power source.□
Remove the dispense platform cover.□
Disconnect the dispense platform water line(s) from the supply line inside the refrigerated cabinet and disconnect□
the wiring connection(s) from the cabinet receptacle(s).
Remove the mounting screw(s) securing the dispense platform(s) to the cabinet.□
Pullthedispenseplatform(s)completelyoutofthecabinetandplaceitonaatworksurface.□
Close the dispenser door.□
Remove the 4 screws securing the pump head.□
Gently pull the pump head apart.□
Gently pull the pump tube from around the pump’s rotor.□
Release the clamps securing the old pump tubing to the plastic elbows.□
Pulltheplasticelbowsfromtheoldpumptubing,anddiscardtheoldpumptubing.□
Insert the plastic elbows into the new pump tubing and secure it with the clamps.□
Gently wrap the new pump tubing around the pump’s rotor.□
Reassemble the pump housing onto the platform assembly.□
Repeat this process for the remaining pumps.□
Replacethedispenseplatform(s)intotherefrigeratedcabinet,makingsuretoreconnectallelectricalandwater□
connections.
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);mixingelement(s),driptrayanddriptraycoverinamilddetergent□
solution. Rinse thoroughly.
Wipesplashpanel,areasarounddispensenozzle(s),andrefrigeratedcompartmentwithaclean,dampcloth.□
Inspect door seal gasket for wear and cleanliness.□
Step 7: Examine all electrical connections and power cord for loose connection.
Step 8: Examine all water lines and supply for leakage.
Step 9: Check cabinet temperature with thermometer (Note: The dispenser must be on to perform this step).
Install thermometer in cabinet and monitor temperature to see if it comes down below 41 degrees Fahrenheit.□
Good idea always to leave thermometer in cabinet to monitor proper cooling process and temperature.
Checkforproperairowinsidecabinetaroundproduct.□
Step 10: Check product mix brix/ratio in their corresponding dispense station (Note: The dispenser must be on to
perform this step).
Water Flow Test and Adjustment□
Step 1: Place the pitcher beneath the dispense nozzle you are testing.
Step 2: Place the “Dispense Lockout” switch in the Off position.
Step 3:Pressandreleasetheappropriatedispensebutton,(“Stop/Plus”buttonifusingportioncontrol
option). The machine will dispense water from the dispense nozzle for 3 seconds.
Step 4: Measure the water dispensed.
Step 5:Adjustthewaterowifneeded,(seewaterowchartinthe“InstallationandOperatingGuide”). 
 Clockwisewillincreaseowrateandcounterclockwisewilldecreasetheowrate.
Rev. 05/19/09

Step 6: Mark the quantity of water dispensed on the total dispense ratio chart.
Total Dispense Test□
Step 1: Place the pitcher beneath the dispense nozzle you are testing.
Step 2: Place the “Dispense Lockout” switch in the Off position.
Step 3:Pressandreleasethedispensebutton,(“Stop/Plus”buttonifusingportioncontroloption),6times.
Step 4: Measure the amount of liquid dispensed.
Step 5: Mark the quantity of liquid dispensed on the total dispense ratio chart.
Pump Speed Adjustment□
Step 1: Disconnect the machine from the power source.
Step 2: Remove the drip tray.
Step 3: Remove the splash panel by removing the screws holding it in place.
Step 4:Locatetheadjustmentknobsonthecontrolboard.Turntheknob,associatedwiththedispense
 stationyouwishtoadjust,clockwisetoincreasethepumpspeedandcounterclockwisetodecreasethe 
pump speed. Increasing the pump speed will increase the amount of product dispensed giving you a higher
 total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 replace the splash panel.
Temperature Compensated Refractometer Method□
Step 1:AdjustthewaterowasdescribedinWaterFlowTestandAdjustment.
Step 2: Place an empty container under the appropriate dispense nozzle.
Step 3:Pressandholdthe“ProductDispenseSwitch”,untilwaterandconcentratebeginowingfreelyfrom
the dispense nozzle.
Step 4: Discard the product caught previously and place the empty container back under the dispense
nozzle.
Step 5:Pressandholdthe“ProductDispenseSwitch”untilthecupislled.
Step 6:Stirthecontentsofthecup,andusetherefractometer(accordingtothemanufacturer’sinstructions)
to check the brix %.
Step 7: Adjust the pump speed (down to decrease the brix %; up to increase the brix %) to achieve the
correct brix % as described in Pump Speed Adjustment.
Step11:IfcustomerhasaBUNNwaterltrationsysteminstalledbeforethedispenser,replacethelterorltercar-
tridge.
Rev. 05/19/09