Bunn VLPF Use and Care Manual
Contents
1. OPERATING amp SERVICE MANUAL BUNN O MATIC CORPORATION POST OFFICE BOX 3227 SPRINGFIELD ILLINOIS 62708 3227 PHONE 217 529 6601 FAX 217 529 6644 10179 0000G 6 00 1987 BUNN O MATIC CORPORATION INTRODUCTION This equipment will brew a half gallon batch of coffee into an awaiting decanter and dispense hot water on demand for other purposes It has two warmers to keep the beverage at the right temperature The brewer is only for indoor use on a sturdy counter or shelf CONTENTS Introduction and tan rhe eb tmt ee 2 User BOUES 3 Electrical Plumbing Requirements Operating Controls 4 Initial Setup Brew Volume Adjustments 5 Coffee Brewing en teet nan etn tantos 6 ce ere 7 zip een ane ee EA S TE 13 Wiring D AO E LB a 28 WARRANTY Bunn O Matic Corp Bunn warrants the equipment manufactured by itto be commercially free from defects in material and workmanship existing at the time of manufacture and appearing within one year from the date of installation In addition 1 Bunn warrants electronic circuit and or control boards to be commercially free from defects in material and workmanship for two years from the date of installation 2 Bunn warrants the compressor on refrigeration equipment to be commercially free from defects in material and workmanship for two years fr2. The BUNN paper filter should be centered in the funnel and the bed of ground coffee leveled by gentle shaking Empty a decanter and place it on the left warmer Insert an empty funnel into the funnel rails Place the On left switch in the upper position Press the Start switch and check the water temperature immediately below the sprayhead with a thermometer The reading should not be less than 195 F Adjust the control thermostat slightly clockwise to increase the water temperature The nut on top of the solenoid valve must be tight or it will vi brate during operation Plumbing lines should not be rest ing on the counter top A The brewer must be connected to a cold water line B Water pressure to the brewer must not be higher than 90 psi 620 kPa Install a regulator if necessary to lower the working pressure to approximately 50 psi 345kPa 10179 060100 SERVICE This section provides procedures for testing and replacing various major components used in this brewer should service become necessary Refer to Troubleshooting for assistance in determining the cause of any problem COMPONENT ACCESS WARNING Unplug the brewer before the removal of any panel or the replacement of any component The On Left switch Start switch Right switch solenoid valve brew timer liquid level control com ponents relay control thermostat limit thermostat and tank heater are located in the hood Access is gained b
3. 90 psi 620 kPa to reduce it to 50 psi 345 kPa The water inlet fitting is 1 4 flare NOTE Bunn O Matic recommends 1 4 copper tubing for installations of less than 25 feet and 3 8 for more than 25 feet from the 1 2 water supply line A tight coil of copper tubing in the water line will facilitate moving the brewer to clean the countertop Bunn O Matic does not recommend the use of a saddle valve to install the brewer The size and shape of the hole made in the supply line by this type of device may restrict water flow Plumbing Hook Up 1 Attach the female fitting from the short piece of tubing on the flow control strainer assembly supplied to the water inlet fitting on the right rear side of the brewer 2 Flush the water line and securely attach it to the flare fitting on the flow control strainer assembly 3 Turn on the water supply This equipment must be installed to comply with the Basic Plumbing Code of the Building Officials and Code Administrators International Inc BOCA and the Food Service Sanitation Manual of the Food and Drug Administra tion FDA OPERATING CONTROLS A On Left Switch Placing the switch in the upper position supplies power to the left decanter warmer and enables brewing and refilling of the tank Placing the switch in the lower position cuts power to the left decanter warmer and stops brewing and refilling of the tank Stopping a brew cycle after it has been started will not stop the flow of w
4. Check for continuity across the two terminals on the switch when it is held in the lower position Continuity must not be present across these ter minals in the upper position If continuity is present as described reconnect the wires the switch is operating properly It does not matter which terminals the wires are installed on If continuity is not present as described replace the switch Removal and Replacement 1 Remove all wires from the switch terminals 2 Compress the clips inside the hood and gently push the switch through the opening 3 Pushthe new switch into the opening and spread the clips to hold the switch captive in the hood 4 Refer to the FIG 23 When reconnecting the wires BLU to Timer WHI RED to On Left Switch WHI RED to Liquid Level Control Board P1987 FIG 23 START SWITCH TERMINAL Page 26 10179 060100 SERVICE cont TANK HEATER FIG 24 TANK HEATER Location The tank heater is located on the tank lid Test Procedure 1 Disconnect the brewer from the power source and remove both wires from the tank heater 2 With a voltmeter check the voltage across the black and white wires removed from the tank heater when the control thermostat is turned ON fully clockwise Connect the brewer to the power source The indication must be 120 volts ac 3 Disconnect the brewer from
5. On Left switch is in the upper position Connect the brewer to the power source The indication must be 120 volts ac 3 Disconnect the brewer from the power source If voltage is present as described proceed to 4 If voltage is not present as described refer to the Wiring Diagram and check the brewer wiring harness 4 Reconnect the white brown wire to terminal 1 5 Carefully connect a piece of insulated jumper wire to terminal 4 Keep the other end of this wire away Page 20 from any metal surface of the brewer 6 With a voltmeter check the voltage across termi nals 1 amp 3 when the On Left switch is in the upper position Connect the brewer to the power source The indication must be 120 volts ac after a delay of approximately 5 seconds 7 Touch the end of the jumper wire to the brewer housing The indication must be zero 8 Movethe jumper wire away from the brewer hous ing The indication must again be 120 volts ac af ter a delay of approximately 5 seconds 9 Disconnect the brewer from the power source and remove the jumper wire from terminal 4 If voltage is present as described the liquid level con trol board is operating properly proceed to 710 If voltage is not present as described replace the liq uid level control board 10 Reconnect the pink wire to terminal 4 11 Gently pull the probe out of the tank lid and in spect for corrosion Replace it if necessary Place the probe so that neit
6. See page 27 10179 060100 TROUBLESHOOTING cont PROBLEM Decanter warmer is not hot Spitting or unusual steaming from sprayhead Inconsistent beverage level in de canter PROBABLE CAUSE 1 Warmer switches 2 Decanter warmers 1 Control thermostat 2 Lime build up CAUTION Tank and tank compo nents should be delimed regularly depending on local water condi tions Excessive mineral build up on stainless steel surfaces can ini tiate corrosive reactions resulting in serious leaks 1 How control 2 Improper water pressure Page 10 REMEDY A The decanter warmer switch must be in the upper position for the warmer to operate B Refer to Service On Left or Right switch for testing proce dures See page 22 or 24 Refer to Service Decanter Warmer for testing procedures See page 18 Refer to Service Control Thermo stat for testing procedures See page 17 Inspect the tank assembly for ex cessive lime deposits Delime as required A Direction of flow arrow must be pointing towards the brewer B Remove the control and check for obstructions Clear or replace Check the operating water pres sure to the brewer It must be be tween 20 138 and 90 psi 620 kPa 10179 060100 TROUBLESHOOTING cont PROBLEM Inconsistent beverage level in de canter cont Consistently high or low beverage level in decanter Dripping from sprayhead Beverage overflows decanter We
7. canter Warmer FIG 19 RIGHT SWITCH TERMINALS 10179 060100 SERVICE cont SOLENOID VALVE P2173 80 FIG 20 SOLENOID VALVE Location The solenoid valve is located in the left rear cor ner of the hood Test Procedures 1 Disconnect the brewer from the power source and remove both wires from the solenoid valve coil terminals 2 With a voltmeter check the voltage across the white and white blue wires when the On Left switch is in the upper position and the Start switch is pressed to the lower position and released Connect the brewer to the power source The in dication must be 120 volts ac for the approximate setting on the brew timer dial and then return to zero 3 Disconnect the brewer from the power source If voltage is present as described proceed to 4 If voltage is not present as described refer to the Wiring Diagram and check the brewer wiring harness 4 Checkfor continuity across the solenoid valve coil If continuity is present as described reconnect the white and white blue wires and proceed to 75 If continuity is not present as described replace the solenoid valve Page 25 5 Check the solenoid valve for coil action Connect the brewer to the power source place the On Left switch in the upper position press and release the Start switch Listen carefully in the vicinity of the solenoid valve for a clicking sound as the coil magnet attracts and after the approxim
8. the auto matic refill to operate B Refer to Service On Left switch for testing procedures See page 22 10179 060100 TROUBLESHOOTING cont PROBLEM Automatic refill will not operate after drawing hot water cont Water flows into tank continuously On left switch OFF Water flows into tank continuously On left switch ON Water is not hot PROBABLE CAUSE 2 Liquid level control system 3 Relay 4 Solenoid valve 1 Solenoid valve 1 Liquid level control system 2 Relay 3 Brew timer 1 Limit thermostat CAUTION Do not eliminate or by pass limit thermostat Use only replacement part 29329 1000 2 Control thermostat 3 Tank heater Page 9 REMEDY Refer to Service Liquid Level Control system for testing proce dures See page 20 Refer to Service Relay for test ing procedures See Page 23 Refer to Service Solenoid valve for testing procedures See page 25 Refer to Service Solenoid valve for testing procedures See page 25 Refer to Service Liquid Level Control system for testing proce dures See page 20 Refer to Service Relay for test ing procedures See page 23 Refer to Service Brew timer for testing procedures See page 14 Refer to Service Limit Thermo stat for testing procedures See page 19 Refer to Service Control Thermo stat for testing procedures See page 17 Refer to Service Tank Heater for testing procedures
9. 9 060100 SERVICE cont ON LEFT SWITCH If continuity is not present as described replace the switch Removal and Replacement 1 Remove all wires from the switch terminals 2 Compress the clips inside the hood and gently push the switch through the opening 3 Pushthe new switch into the opening and spread the clips to hold the switch captive in the panel 4 Referto FlG 15 when reconnecting the wires WHI to Right switch BLK to Right switch WHI to Left warmer BLK to Cordset P2172 80 FIG 14 ON LEFT SWITCH Location The On Left switch is located in the front of the hood above and to the left of the brew funnel Test Procedure 1 Disconnect the brewer from the power source and remove the wires from all three terminals of the On Left switch 2 With a voltmeter check the voltage across the P1987 black and white wires Connect the brewer to the FIG 15 ON LEFT SWITCH TERMINALS power source The indication must be 120 volts ac 3 Disconnect the brewer from the power source WHI RED to Start switch WHI VIO to Left warmer If voltage is present as described proceed to 74 If voltage is not present as described refer to the Wiring Diagram and check the brewer wiring harness 4 Check for continuity across the two terminals on the left side of the switch when it is in the upper position
10. Continuity must not be present across these terminals in the lower position If continuity is present as described reconnect the wires the switch is operating properly Page 22 10179 060100 SERVICE cont RELAY P2172 80 FIG 16 RELAY Location The relay is located in the right rear corner of the hood Test Procedures 1 Disconnect the brewer from the power source 2 With a voltmeter check the voltage across termi nals A amp B in the lower corners of the relay when the On Left switch is in the upper position and the Start switch is pressed to the lower position and released Connect the brewer to the power source The indication must be 120 volts ac for the ap proximate setting on the brew timer dial and then return to zero 3 Disconnect the brewer from the power source If voltage is present as described proceed to 4 If voltage is not present as described refer to the Wiring Diagram and check the brewer wiring harness 4 Remove the black and white wires from terminals A amp B 5 Checkfor continuity across terminals A amp B of the relay If continuity is present as described reconnect the black and white wires and proceed to 76 If continuity is not present as described replace the relay 6 Remove the white brown white red and white blue wires from terminals 2 5 amp 7 of the relay Page 23 7 Check for continuity across terminals 2 amp 7 when the On Left switch is in the up
11. ak beverage PROBABLE CAUSE 3 Syphon System 1 Brew timer adjustment 1 Syphon System 2 Solenoid valve 1 Beverage left in decanter 2 Incorrect decanter size 1 Type of paper filters 2 Coffee 3 Sprayhead Page 11 REMEDY Water should flow freely from the sprayhead for approximately twenty seconds after the brew solenoid has shut off and then stop flowing abruptly The brewer must be level from side to side to syphon properly Adjust the brew timer as required to achieve the recommended 64 0z for each brew cycle Water should flow freely from the sprayhead for approximately twenty seconds after the brew solenoid has shut off and then stop flowing abruptly The brewer must be level from side to side to syphon properly Refer to Service Solenoid valve for testing procedures See page 25 The brew cycle should be started only with an empty decanter un der the funnel Use only 64 oz decanters BUNN paper filters should be used for proper extraction A sufficient quantity of fine or drip grind coffee should be used for proper extraction Bunn 0 Matic sprayhead 01082 0000 should be used to properly wet the bed of ground coffee in the funnel 10179 060100 TROUBLESHOOTING cont PROBLEM PROBABLE CAUSE Weak beverage cont 4 Funnel loading 5 Water temperature Brewer is making unusual noises 1 Solenoid valve 2 Plumbing lines 3 Water supply Page 12 REMEDY
12. and to the right of the brew funnel Test Procedure 1 Disconnect the brewer from the power source and remove the wires from all three terminals of the Right switch 2 With a voltmeter check the voltage across the black and white wires Connect the brewer to the power source The indication must be 120 volts ac 3 Disconnect the brewer from the power source If voltage is present as described proceed to 4 If voltage is not present as described refer to the Wiring Diagram and check the brewer wiring harness 4 Check for continuity across the two terminals on the left side of the switch when it is in the upper position Continuity must not be present across these terminals in the lower position Page 24 If continuity is present as describe reconnect the wires the switch is operating properly If continuity is not present as described replace the switch Removal and Replacement 1 Remove all wires from the switch terminals 2 Compress the clips inside the hood and gently push the switch through the opening 3 Pushthe new switch into the opening and spread the clips to hold the switch captive in the panel 4 Refer to FIG 19 when reconnecting the wires WHI Tank Keep Warm Heater Lead WHI to On Left Switch WHI to Solenoid WHI Tank Keep Warm Heater Lead BLK to On Left Switch BRN BLK to Right De
13. ate setting on the brew timer dial repels the plunger 6 Disconnect the brewer from the power source If the sound is heard as described and water will not pass through the solenoid valve there may be a block age in the water line before or after the solenoid valve or the solenoid valve may require inspection for wear and removal of waterborne particles If the sound is not heard as described replace the solenoid valve Removal and Replacement Remove all wires from the solenoid valve coil 1 2 Turn off the water supply to the brewer 3 Disconnect the water lines to and from the sole noid valve 4 Remove the two 78 32 nuts holding the solenoid valve mounting bracket to the hood Lift out the solenoid valve 6 Remove the solenoid valve from the mounting bracket 7 Securely install the new solenoid valve to the mounting bracket 8 Attach the mounting bracket to the hood 9 Securely fasten the water lines to and from the solenoid valve 10 Refer to FIG 21 when reconnecting the wires e WHI to Right Switch 1 WHI to Liquid Level Control Board FIG 21 SOLENOID TERMINALS 10179 060100 SERVICE cont START SWITCH P2172 80 FIG 22 START SWITCH Location The Start switch is located in front of the hood centered above the brew funnel Test Procedure 1 Disconnect the brewer from the power source and remove the wires from both terminals of the Start Switch
14. ater into the funnel until the tank syphons down to its proper level NOTE The On Left switch must be in the upper position to initiate and complete a brew cycle or to automatically refill the tank after using the hot water faucet B Start Switch Starts a brew cycle when the On Left switch is in the upper position C Right Switch Placing the switch in the upper position supplies power to the right decanter warmer Placing the switch in the lower position cuts power to the right decanter warmer Page 4 10179 060100 INITIAL SET UP CAUTION The brewer must be unplugged throughout the nitial Set up except when specified in the instruc tions Remove the top lid from the brewer Rotate the control thermostat knob fully counterclockwise to the OFF position and replace the top lid Insert an empty funnel into the funnel rails Place a decanter containing a small amount of water on the left warmer Plug inthe brewer and place the On Left switch in the upper position Water will flow into the tank after a five second delay and continue until the tank has filled to its capacity This should take approximately seven minutes NOTE The On left switch must be in the upper position to initiate and complete a brew cycle or to automatically refill the tank after using the hot water faucet Place the On left switch in the lower position Unplug the brewer Remove the top lid Rotate the control thermostat knob fully clockw
15. cal connections tight and isolated This brewer is heated at all times unless unplugged Keep away from combustibles WARNING Exercise extreme caution when servicing electrical equipment e Unplug the brewer when servicing except when electrical tests are specified e Follow recommended service procedures Replace all protective shields or safety notices Page 1 10179 060100 TROUBLESHOOTING cont PROBLEM Equipment will not operate Brew cycle will not start Automatic refill will not operate af ter drawing hot water PROBABLE CAUSE 1 No power or incorrect voltage 1 No water 2 Water strainer Flow Control 3 On Left switch 4 Start switch 5 Brew timer 6 Relay 7 Solenoid valve 1 On Left switch Page 8 REMEDY A Plug in brewer B Check wall outlet for 120V ac C Check circuit breaker fuse Check plumbing and shut off valves A Direction of flow arrow must be pointing towards brewer B Remove the strainer Flow con trol and check for obstructions Clear or replace Refer to Service On Left switch for testing procedures See page 22 Refer to Service Start switch for testing procedures See page 26 Refer to Service Brew timer for testing procedures See page 16 Refer to Service Relay for test ing procedures See page 23 Refer to Service Solenoid valve for testing procedures See page 25 A The On Left switch must be in the upper position for
16. es of spring should be visible Saw back and forth five or six times Then repeat this step for the airvent tube NOTE In hard water areas this may need to be done daily It will help prevent liming problems in the brewer and takes less than a minute Page 6 10179 060100 TROUBLESHOOTING A troubleshooting guide is provided to suggest probable causes and remedies for the most likely problems encountered If the problem remains after exhausting the troubleshooting steps contact the Bunn O Matic Technical Services Department Inspection testing and repair of electrical equipment should be performed only by qualified service person nel All electronic components have 120 volt ac and low voltage dc potential on their terminals Shorting of terminals or the application of external voltages may result in board failure Intermittent operation of electronic circuit boards is unlikely Board failure will normally be permanent If an intermittent condition is encountered the cause will likely be a switch contact or a loose connection at a terminal or crimp Solenoid removal requires interrupting the water supply to the valve Damage may result if solenoids are energized for more than ten minutes without a supply of water The use of two wrenches is recommended whenever plumbing fittings are tightened or loosened This will help to avoid twists and kinks in the tubing Make certain that all plumbing connections are sealed and electri
17. he Wiring Diagram and check the brewer wiring harness 4 Disconnect the white blue wire from terminal TL3 and the blue black wire from terminal TL5 Check for continuity across the two wires when the start switch is pressed to the START position If continuity is present as described reconnect the wires and proceed to 75 If continuity is not present as described refer to the Wiring Diagram and check the brewer wiring harness Page 15 5 With a voltmeter check the voltage across termi nals TL1 and TL4 when the ON OFF switch is in theh ON position Connect the brewer to the power source The indication must be 0 volts If voltage is as described proceed to 76 If voltage is not as described disconnect the brewer from the power source and replace the timer 6 With a voltmeter check the voltage across termi nals TL1 and TL4 when the ON OFF switch is in the ON position Connect the brewerto the power source and press the start switch The indication must be 120 volts ac If voltage is present as described the brew timer is operating properly Reset the timer as required to obtain the desired brew volume If voltage is not present as described disconnect the brewer from the power source and replace the timer Removal and Replacement NOTE Do not remove or install wires while timer board is installed Pressure applied to one side may cause damage to the board 1 Removethe two 78 32 nuts secur
18. he power source The indication must be 120 volts ac 3 Disconnect the brewer from the power source If voltage is present as described proceed to 4 If voltage is not present as described refer to the Wir ing Diagram and check the brewing harness 4 With a voltmeter check the voltage across sock ets 1 amp 2 blue and white wires of the female connector when the On Left switch is in the upper position and the Start switch is pressed to the lower position and held Connect the brewer to the power source The indication must be 120 volts ac until the Start switch is released 5 Disconnect the brewer from the power source If voltage is present as described reconnect the po larized three pin connectors and proceed to 6 If voltage is not present as described refer to the Wir ing Diagram and check the brewer wiring harness Page 6 Disconnectthe in line connectors on the black and white wires from the timer to the wiring harness 7 With a voltmeter check the voltage across the black and white wires when the On Left switch is in the upper position and the Start switch is pressed to the lower position and released Con nect the brewer to the power source The indica tion must be 120 volts ac for approximately 20 seconds and then return to its previous indica tion 8 Disconnect the brewer from the power source If voltage is present as described the brew timer is operating properly Reset the timer dial as requ
19. her end is in contact with any metal surface of the brewer With a voltmeter check the voltage across termi nals 1 amp 3 when the On Left switch is in the upper position Connect the brewer to the power source The indication must be 120 volts ac after a delay of approximately 5 seconds 14 Touch the probe s flat end to the brewer housing The indication must be zero 15 Move the probe s flat end away from the brewer housing The indication should again be 120 volts ac after a delay of approximately 5 seconds 16 Disconnect the brewer from the power source 1 n2 1 If voltage is present as described reinstall the probe the liquid level control system is operating properly If voltage is not present as described check the pink probe wire and or replace the probe 10179 060100 SERVICE cont LIQUID LEVEL CONTROL SYSTEM cont Removal and Replacement 1 Remove all wires from the liquid level control board terminals 2 Remove the two 8 32 slotted head screws hold ing the circuit board to the brewer hood 3 Install the new circuit board to the hood making sure that the two lock washers are in place below the board and above the spacers 4 Refer to FIG 13 when reconnecting the wires WHI BRN to Relay Term 2 WHI RED to Start Switch WHI RED to Relay Term 5 WHI to Timer WHI to Solenoid PNK to Probe P1985 70 FIG 13 LIQUID LEVEL CONTROL BOARD TERMINALS Page 21 1017
20. ibed replace the warmer Removal and Replacement 1 Remove the three 74 40 slotted head screws hold ing the warmer to the brewer base 2 Bring the warmer out the top of the base 3 Disconnect both wires from the warmer 4 Refer to FIG 9 when reconnecting the wires and orienting the warmers 5 Place the warmer into the base and securely at tach it using the three 74 40 screws Left Warmer WHI VIO to On Left Switch WHI to Right Warmer WHI to Cordset Right Warmer BRN BLK to Right Switch WHI to On Left Switch WHI to Left Warmer P1982 FIG 9 WARMER ELEMENT TERMINALS 10179 060100 SERVICE cont LIMIT THERMOSTAT P1983 40 FIG 10 LIMIT THERMOSTAT Location The limit thermostat is located on the tank lid be tween the tank heater terminals Test Procedure 1 Disconnect the brewer from the power source and remove the blue wire from the limit thermostat 2 With a voltmeter check the voltage across the blue wire removed from the limit thermostat and the white wire on the tank heater terminal when the control thermostat is turned ON fully clock wise Connect the brewer to the power source The indication must be 120 volts ac 3 Disconnect the brewer from the power source Page 19 If voltage is present as described reconnect the blue wire and proceed to 74 If voltage is not present as described refer to the Wiring Diagram and check the brewer wiring har
21. ing circuit board to the hood 2 Remove circuit board and spacers as required 3 Remove all wires from the timer 4 Attach all wires to the replacement timer board prior to installation to the component mounting bracket Refer to FIG 5 when reconnecting the wires 5 Install new circuit board with spacers as required to the hood 6 Adjust the timer as described below Timer Setting NOTE Prior to setting or modifying volumes check that the brewer is connected to water supply the tank is properly filled and a funnel and server are in place NOTE All volume settings must be done with the sprayhead installed 10179 060100 SERVICE cont BREW TIMER cont late models 1 Modifying brew volumes To modify a brew vol ume first check that the SET LOCK switch is in the SET position on the circuit board To increase a brew volume place the ON OFF switch in the ON position press and hold the START switch until three clicks are heard Release the switch and press it again one or more times Failure to re lease the switch within two seconds after the third click causes the volume setting to be aborted and pre vious volume setting will remain in memory Each time the switch is pressed two seconds are added to the brew time period Allow the brew cycle to finish in order to verify that the desired volume has been achieved To decrease a brew volume place the ON OFF switch in the ON position pre
22. ired to obtain the desired brew volume If voltage is not present as described replace the brew timer Removal and Replacement 1 Separate all connectors between the brewer wir ing harness and the timer 2 Remove the two 78 32 nuts holding the timer to the inside of the hood 3 Install the new timer circuit board as described in Late Model Timer section on the following pages 4 Refer to FIG 5 when reconnecting the wires 5 Install the Timer Setting decal provided with the replacement timer kit on the bottom of the top COVer 6 Adjust the timer as required Refer to Late Model Timer section on the following pages WHI to Relay Coil V N BiKto Relay Coil P1 BLU BLK to Start Switch P2 WHI to Liquid Level Board P3 BLK to Relay OLD STYLE FIG 3 BREW TIMER WIRING 14 10179 060100 SERVICE cont BREW TIMER cont late models P2172 80 FIG 4 BREW TIMER Location The brew timer is located in the hood to the right of the tank Test Procedures 1 Disconnect the brewer from the power source and remove the top cover 2 With a voltmeter check the voltage across termi nals TL1 and TL2 when the ON OFF switch is in the ON position Connect the brewer to the power source The indication must be 120 volts ac 3 Disconnect the brewer from the power source If voltage is present as described proceed to 4 If voltage is not present as described refer to t
23. ise to the ON position and replace the top lid 0 Plug in the brewer and wait for the water in the tank to heat to the proper temperature Some water will drip from the funnel during this time This is due to expansion and should not occur thereafter 11 Place an empty decanter under the funnel 12 Place the On Left switch in the upper position and press the Start switch Empty the decanter after water has stopped flowing from the funnel 13 Allow the water in the tank to reheat to the proper temperature 14 Press the Start switch Check the water volume in the decanter after water has stopped flowing from the funnel It should be 64 ounces 15 If not unplug the brewer and remove the top lid 16 Adjustthe brew timer as required See Adjusting Brew Volumes Replace the top lid plug in the brewer start and measure another brew cycle 17 Repeat steps 13 16 until 64 oz water volume is achieved O1 R wp SoS ADJUSTING BREW VOLUMES CAUTION Disconnect the power source from the brewer prior to the removal of any panel for the replacement or adjustment of any component NOTE Prior to setting or modifying batch sizes check that the brewer is connected to water supply the tank is properly filled and a funnel and server are in place 1 Modifying batch sizes To modify a batch volume first check that the SET LOCK switch is in the SET position on the circuit board To increase a batch size Press and hold
24. l termination and is not kinked 7 Fasten the new control thermostat to the brewer housing 8 Refer to FIG 7 when reconnecting the wires 9 Readjust the control thermostat dial as required BLU to Limit Thermo stat BLK to Cordset U P1981 FIG 7 CONTROL THERMOSTAT TERMINALS 10179 060100 SERVICE cont DECANTER WARMERS P1956 40 FIG 8 DECANTER WARMERS Location The decanter warmers are located in the base of the brewer Test Procedure 1 Disconnect the brewer from the power source and remove the three 4 40 screws attaching the sus pect warmer 2 Bring the warmer assembly out the top of the base 3 Disconnect both wires from the warmer Make sure that the wire ends do not touch any metal surface of the brewer 4 With a voltmeter check the voltage across the two wires removed from the warmer when the appro priate warmer switch on left or right is in the upper position The voltage must be 120 volts ac 5 Connect the crewer to the power source Page 18 If voltage is present as described proceed to 6 If voltage is not present as described refer to the Wiring Diagram and check the brewer wiring harness 6 Disconnect the brewer from the power source 7 Check for continuity across the two terminals on the warmer If continuity is present as described reconnect the wires to the terminals the warmer is operating prop erly If continuity is not present as descr
25. ness 4 Remove the black wire from the limit thermostat 5 With a voltmeter check for voltage across the ex posed terminal of the limit thermostat and the white wire on the tank heater terminal when the control thermostat is turned ON full clockwise Connect the brewer to the power source The in dication must be 120 volts ac 6 Disconnect the brewer from the power source If voltage is present as described reconnect the black wire the limit thermostat is operating properly If voltage is not present as described replace the limit thermostat Removal and Replacement 1 Remove both wires from the limit thermostat ter minals 2 Carefully slide the limit thermostat out from un der the retaining clip 3 Carefully slide the new limit thermostat into the retaining clip 4 Refer to FIG 11 when reconnecting the wires BLU to Control Thermostat BLK to Tank Heater P1984 60 FIG 11 LIMIT THERMOSTAT TERMINALS 10179 060100 SERVICE cont LIQUID LEVEL CONTROL SYSTEM P2173 80 FIG 12 LIQUID LEVEL PROBE amp CONTROL BOARD Location The liquid level control system is composed of the circuit board in the right front corner of the hood and the probe in the tank lid Test Procedure 1 Disconnect the brewer from the power source and remove the wires from terminals 1 amp 4 of the cir cuit board 2 With a voltmeter check the voltage across termi nals 2 amp 3 when the
26. no charge for parts during the warranty period and no charge for labor by a Bunn Authorized Service Representative during the warranty period If Bunn determines that repair is not feasible Bunn shall at its sole option replace the equipment or refund the purchase price for the equipment THE BUYER S REMEDY AGAINST BUNN FOR THE BREACH OF ANY OBLIGATION ARISING OUT OF THE SALE OF THIS EQUIPMENT WHETHER DERIVED FROM WARRANTY OR OTHERWISE SHALL BE LIMITED AS SPECIFIED HEREIN TO REPAIR OR AT BUNN S SOLE OPTION REPLACEMENT OR REFUND In no event shall Bunn be liable for any other damage or loss including but not limited to lost profits lost sales loss of use of equipment claims of Buyer s customers cost of capital cost of down time cost of substitute equipment facilities or services or any other special incidental or consequential damages Page 2 10179 060100 USER NOTICES Carefully read and follow all notices on the equipment and in this manual They were written for your protection All notices on the equipment should be kept in good condition Replace any unreadable or dam aged labels 00656 0000 00658 0000 P This equipment is to be installed to Y comply with the Basic Plumbing Code of A WARNING the Building Officials and Code DISCARD DECANTER IF CRACKED SCRATCHED BOILED DRY HEATED WHEN EMPTY USED ON HIGH FLAME FUNNEL CONTENTS OR EXPOSED ELECTRIC ARE HOT ELEMENTS Administrators In
27. obe and thermostat into the tank lid 14 Securely fasten the 1 4 flare fitting to the tank lid inlet fitting 15 Refer to FIG 25 when reconnecting the wires BLK to limit thermostat 8 g wi to Cordset CZ FIG 25 TANK HEATER TERMINALS P1990 70 10179 060100 SCHEMATIC WIRING DIAGRAM VLPF GREEN N L1 SW amp THERMOSTA LIMIT THERMOSTAT BRN BLK P1 P2 amp P3 ARE PINS OF A POLARIZED JJ P3 THREE PIN CONNECTOR 120 VOLTS 2 WIRE SINGLE PHASE Page 28 10179 091599
28. om the date of installation 3 Bunn warrants that the grinding burrs on coffee grinding equipment will grind coffee to meet original factory screen sieve analysis for three years from date of installation or for 30 000 pounds of coffee whichever comes first This warranty does not apply to any equipment component or part that was not manufactured by Bunn or that in Bunn s judgement has been affected by misuse neglect alteration improper installation or operation improper maintenance or repair damage or casualty THE FOREGOING WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ANY OTHER WARRANTY WRITTEN OR ORAL EXPRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF EITHER MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE The agents dealers or employees of Bunn are not authorized to make modifications to this warranty or to make additional warranties that are binding on Bunn Accordingly statements by such individuals whether oral or written do not constitute warranties and should not be relied upon The Buyer shall give Bunn prompt notice of any claim to be made under this warranty by telephone at 217 529 6601 or by writing to Post Office Box 3227 Springfield Illinois 62708 3227 If requested by Bunn the Buyer shall ship the defective equipment prepaid to an authorized Bunn service location If Bunn determines in its sole discretion that the equipment does not conform to the warranty Bunn shall repair the equipment with
29. one from changing brew time once programmed you can set the SET LOCK switch to the LOCK position This will pre vent any further programming until switch is once again put into the SET position O Q TL5 Td 13 TL2 a TL 200 O O BLU BLK wire from TL5 to P1 WHI GRN wire from TL4 to WHI Relay Coil WHI BLU wire from TL3 to BLK Relay Coil WHI wire from TL2 to P2 BLK wire from TL1 to P3 P2037 FIG 5 DIGITAL TIMER WIRING 10179 060100 SERVICE cont CONTROL THERMOSTAT P2172 80 FIG 6 CONTROL THERMOSTAT Location The control thermostat is located on the rear of the hood to the right of the tank Test Procedure 1 Disconnect the brewer from the power source and remove the black wire from the control thermo Stat 2 With a voltmeter check the voltage across the black wire removed from the control thermostat and the white wire on the tank heater terminal Connect the brewer to the power source The in dication must be 120 volts ac 3 Disconnect the brewer from the power source If voltage is present as described reconnect the black wire and proceed to 4 If voltage is not present as described refer
30. per position only until the Start switch is pressed to the lower posi tion and released Connect the brewer to the power source Continuity must return across these ter minals after the approximate setting on the brew timer dial Disconnect the brewer from the power source 9 Check for continuity across terminals 5 amp 7 when the On Left switch is in the upper position and the Start switch is pressed to the lower position and released Connect the brewer to the power source Continuity must be present across these termi nals for the approximate setting on the brew timer dial 10 Unplug the brewer em If continuity is present as described reconnect the wires the relay is operating properly If continuity is not present as described replace the relay Removal and Replacement 1 Remove all wires from the relay terminals Remove the two 78 32 nuts holding the relay mounting bracket to the hood Remove the relay from the mounting bracket 4 Securely install the new relay to the mounting bracket 5 Install the relay mounting bracket to the hood 6 Refer to FIG 17 when reconnecting the wires WHI BRN to Liquid Level Board Solenoid WHI to Timer WHI RED toLiquid Level Board WHI RED to Timer FIG 17 RELAY TERMINALS 10179 060100 SERVICE cont RIGHT SWITCH P2172 80 FIG 18 RIGHT SWITCH Location The Right switch is located in the front of the hood above
31. ss and release the START switch once for every two second interval to be removed from the total brew time period then im mediately press and hold down the START switch until three clicks are heard Relase the switch Failure to release the switch within two seconds after the third click causes the volume setting to be aborted and pre vious volume setting will remain in memory Allow the brew cycle to finish in order to verify that the de sired volume has been achieved 2 Setting brew volumes To set a brew volume first check that the SET LOCK switch is in the SET position on the circuit board Place the ON OFF switch in the ON position press and hold the START switch until three distinct clicks are heard and then release the switch Failure to release theh switch within two seconds after the third click causes the volume set ting to be aborted and previous volume setting will remain in memory View the level of the liquid being dispensed When the desired level is reached turn the ON OFF switch to OFF Page 16 NOTE Several ounces of water will continue to sy phon from the tank after turning the switch OFF The brewer remembers this volume and will continue to brew batches of this size until the volume setting procedure is repeated NOTE When brewing coffee volume will decrease due to absorption by the coffee grounds 3 Setting programming disable feature If it be comes necessary to prevent any
32. ternational Inc BOCA and the Food Service Sanitation Manual of the Food and Drug Administration FDA READ THE ENTIRE OPERATING MANUAL 00831 0000 BEFORE USING THIS PRODUCT FAILURE TO COMPLY RISKS INJURY AWARNING Fill water tank before turning on 7 thermostat connecting appliance to power source Use only on a properly protected circuit capable of the rated load Electrically ground the chassis 00882 0000 Follow national local electrical codes Do not use near combustibles HOT WATER FAILURE TO COMPLY RISKS EQUIPMENT DAMAGE FIRE OR SHOCK HAZARD READ THE ENTIRE OPERATING MANUAL BEFORE BUYING OR USING THIS PRODUCT THIS APPLIANCE IS HEATED WHENEVER CONNECTED TO A POWER SOURCE 00831 0000F 3 98 1988 BUNN O MATIC CORPORATION Do Not Use During Brew Cycle 12364 0000 CAUTION 6 sce 10179 091599 Page 3 ELECTRICAL REQUIREMENTS CAUTION The brewer must be disconnected from the power source until specified in nitial Set Up The brewer has an attached cordset and requires 2 wire grounded service rated 120 volts ac 15 amp single phase 60 Hz PLUMBING REQUIREMENTS This brewer must be connected to a cold water system with operating pressure between 20 138 and 90 psi 620 kPa from a 1 2 or larger supply line A shut off valve should be installed in the line before the brewer Install a regulator in the line when pressure is greater than
33. the START or BREW switch until three clicks are heard Release the switch Failure to release the switch within two seconds after the third click causes the volume setting to be aborted and previous volume setting will remain in memory and press it again one or more times Each time the switch is pressed two seconds are added to the brew time period Allow the brew cycle to finish in order to verify that the desired volume has been achieved To decrease a batch size Press and release the START or BREW switch once for every two second interval to be removed from the total brew time period then immediately press and hold down the START or BREW switch until three clicks are heard Release the switch Failure to release the switch within two seconds after the third click causes the volume setting to be aborted and previous volume setting will remain in memory Allow the brew cycle to finish in order to verify that the desired volume has been achieved Page 5 10179 060100 ADJUSTING BREW VOLUMES cont 2 Setting batch sizes To set a batch volume first check that the SET LOCK switch is in the SET position on the circuit board Press and hold the START or BREW switch until three distinct clicks are heard and then release the switch Failure to release the switch within two seconds after the third click causes the volume setting to be aborted and previous volume setting will remain in memory View the level of the liquid being dispensed When
34. the desired level is reached turn the ON OFF switch to OFF The brewer remembers this volume and will continue to brew batches of this size until the volume setting procedure is repeated NOTE When brewing coffee batch volumes will decrease due to absorption by the coffee grounds 3 OO O1 R D Setting programming disable feature If it becomes necessary to prevent anyone from changing brew times once programmed you can set the SET LOCK switch to the LOCK position This will prevent any program ming to be done until switch is once again placed in the SET position COFFEE BREWING Insert a BUNN filter into the funnel Pour the fresh coffee into the filter and level the bed of grounds by gently shaking Slide the funnel into the funnel rails Place the On Left switch in the upper position Press the Start switch When brewing is completed simply discard the grounds and filter NOTE Any attempt to draw hot water from the faucet during a brew cycle will result in a lesser amount of finished beverage in the decanter CLEANING The use of a damp cloth rinsed in any mild non abrasive liquid detergent is recommended for cleaning all surfaces on Bunn O Matic equipment Check and clean the sprayhead The sprayhead holes must always remain open With the sprayhead removed insert the deliming spring provided all the way into the sprayhead tube When inserted properly no more than two inch
35. the power source If voltage is present as described proceed to 4 If voltage is not present as described refer to the Wiring Diagram and check the brewer wiring harness 4 Check for continuity across the terminals of the tank heater If continuity is present as described reconnect the wires the tank heater is operating properly If continuity is not present as described replace the tank heater Page 27 NOTE the tank heater remains unable to heat remove and inspect the heater for cracks in the sheath Removal and Replacement 1 Remove the white wire from the tank heater ter minal and the blue wire from the limit thermostat terminals 2 Gently pull the liquid level probe and thermostat tube with grommet out of the tank lid 3 Disconnect the 1 4 flare fitting on the tank lid in let fitting 4 Remove the sprayhead and sprayhead nut from the panel on the bottom of the hood 5 Disconnect the airvent tube from the fitting above the sprayhead panel 6 Loosen the eight 78 32 nuts on the tank lid and remove the tank lid 7 Remove the two nuts from the tank heater fittings 8 Remove the tank heater 9 Install the new tank heater with new sealing wash ers on the underside of the tank lid Securely tighten the nuts to be certain of a water tight seal 11 Reinstall tank lid and secure with eight 78 32 nuts 12 Reinstall the sprayhead tube nut and sprayhead 13 Reinstall the liquid level pr
36. to the Wiring Diagram and check the brewer wiring harness 4 Remove the blue wire from the control thermo Stat 5 With a voltmeter check the voltage across the ex posed terminal of the control thermostat and the white wire on the tank heater terminal when the control thermostat is turned ON fully clock wise Connect the brewer to the power source The indication must be 120 volts ac Voltage must not be indicated across these terminals when the thermostat is turned OFF fully counterclock wise Page 17 6 Disconnect the brewer from the power source If voltage is present as described reconnect the blue wire the control thermostat is operating properly If voltage is not present as described replace the con trol thermostat Removal and Replacement 1 Remove both wires from the control thermostat terminals 2 Remove the thermostat bulb by firmly pulling up on the capillary tube at the tank lid This will dis engage the grommet from the tank lid 3 Remove the two 8 32 screws holding the con trol thermostat to the brewer housing 4 Slide the grommet to the red mark on the capil lary tube 5 Insert the bulb through the hole in the tank lid and press the grommet firmly and evenly so the groove in the grommet fits into the tank lid 6 Carefully bend the capillary tube so the tube and bulb inside the tank are in a vertical position NOTE Make sure the capillary tube is away from any electrica
37. y removing the top lid attached with two 4 40 slotted head screws WARNING Inspection testing and repair of electri cal equipment should be performed only by qualified service personnel The brewer should be unplugged when servicing except when electrical tests are re quired and the test procedure specifically states to plug in the brewer P1956 40 FIG 1 COMPONENT ACCESS CONTENTS Brew 14 Control Thermostat 17 Decanter 18 19 Liquid Level Control System 20 On Left Warmer Switch 22 RM 23 Right Warmer Switch 24 Solenoid Valve 25 Start 26 Tank Heater aio ted tatis Dno 27 Wiring Diagram 28 Page 13 10179 060100 SERVICE cont BREW TIMER early models P1979 75 FIG 2 BREW TIMER Location The brew timer is located in the hood to the right of the tank Test Procedure 1 Disconnect the brewer from the power source and separate the polarized three pin connectors be tween the timer and brewer wiring harness and rotate the brew timer dial fully counterclockwise 2 With a voltmeter check the voltage across sock ets 2 amp 3 white and black wires of the female connector when the On Left switch is in the upper position Connect the brewer to t
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