Bunn Single SH Operating & Service Manual Download | Manualshive

Page: 15 / 44

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Page 15

SERVICE (cont.)

BYPASS VALVE

Location:

The bypass valve is located inside the right front

of the hood.

Test Procedures:
1. Disconnect the brewer from the power source.

Place a server beneath the brewing funnel.

2. Check the water level in the tank to confirm that it

is within 1/2" from the top of the tank.

3. Connect the brewer to the power source.
4. Check the bypass valve for coil action. Place the

ON/OFF switch in the "ON" position, press and
release the BREW switch. Listen carefully in the
vicinity of the bypass valve for a "clicking" sound as
the coil magnet attracts and repels the plunger.

5. Disconnect the brewer from the power source.

If the sound is heard as described, there may be a
blockage in the bypass valve or the water line to the
sprayhead. Remove the bypass valve and inspect for
wear, and remove waterborne particles.
If the sound is not heard as described, proceed to #6.

6. Connect the voltmeter lead ends to the dispense

valve coil terminals. Connect the brewer to the
power source. With the selector switch in the 1.5
or 1.75 gallon position, place "ON/OFF" Switch in
the "ON" position. Press and release the brew
switch. The indication must be:

P774

FIG. 2 BYPASS VALVE

FIG.3 BYPASS VALVE TERMINALS

22978.0000

TL5

TL4

TL3

TL2

TL1

J2

J1

SE

T

LO

CK

LOCK

SET

1 2 3 4 5 6

P2230

WHI/GRN to Dispence Valve

WHI/VIO to Brew Selector Switch

28230 031201

a.) 120 volts ac for two wire 120 volt models, 208
volts ac for three wire 120/208 volt models and
240 volts ac for three wire 120/240 volt models.
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models.

7. Disconnect the brewer from the power source.

If voltage is present as described, but no coil action is
observed, nor "clicking" heard, bypass valve is defec-
tive. Replace valve and test again to verify repair.
If voltage is not present as described, refer to

Wiring

Diagrams and check the brewer wiring harness. Also
check the control board for proper operation. See
Pages 23 through 27.

Removal and Replacement:
1. Remove the wires from the bypass valve.
2. Drain enough water from the tank so bypass valve

is above the water level.

3. Remove water lines from valve.
4. Remove two nuts retaining bypass valve inside the

hood and remove bypass valve.

5. Remove hose barb fitting and attach to new by-

pass valve.

6. Install new bypass valve with hose barb fitting.
7. Reconnect the water tubes and the wires to the

bypass valve.

8. Refer to Fig. 3 when reconnecting the wires.

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Summary of Contents for Single SH

Page 1: ... INJU RY PN 658 198 5 BUN N O MA TIC CO RPO RAT ION FU NN EL CO NT EN TS AR E HO T CA UT IO N HO T WAT ER D IS C O N N E C T FR O M P O W E R S O U R C E B E FO R E R E M O V A L O F A N Y P A N E L O R R E P LA C E M E N T O F A N Y C O M P O N E N T W A R N IN G BUNN O MATIC CORPORATION POST OFFICE BOX 3227 SPRINGFIELD ILLINOIS 62708 3227 PHONE 217 529 6601 FAX 217 529 6644 www bunnomatic com 28...

Page 2: ...ARRANTY 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 warr...

Page 3: ...r vice rated 120 208 volts or 120 240 volts ac 20 amp single phase 60 Hz Requires 2 wire grounded ser vice rated 120 volts ac 20 amp single phase 60 Hz USER NOTICES The notices on this brewer should be kept in good condition Replace unreadable or damaged labels 00658 0000 WARNING HOT WATER 20201 5600 00656 0000 120V A C NEUTRAL WHITE L1 BLACK 208 or 240 Volts A C L2 RED WHITE NEUTRAL L1 BLACK 120 ...

Page 4: ...kPa froma1 2 orlargersupplyline Ashut offvalveshouldbeinstalledinthelinebeforethebrewer Install a regulator in the line when pressure is greater than 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 copp...

Page 5: ... position and initiate a brew cycle Triple set timers require the setting of each dial individually The 5 minute dial is for 1 2 gallon 8 minute dial is for 1 gallon and the 10 minute dial is for 1 1 2 or 1 3 4 gallon settings 6 Place the On Off switch in the lower OFF position after water has stopped flowing from the funnel and check the water volume in the server It should be 64 oz 1 2 gallon 12...

Page 6: ...ART 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 2 Setting batch sizes To set a batch volume first check that the SET LOCK switch...

Page 7: ...upper position NOTE The On Off switch must be in the lighted upper position to initiate and complete a brew cycle COFFEE BREWING 1 Select the desired batch size 2 Insert a BUNN filter into the funnel 3 Pour the proper amount of fresh coffee into the filter and level the bed of grounds by gently shaking 4 Slide the funnel into the funnel rails 5 Place an empty server under the funnel 6 Place the On...

Page 8: ...upply of water The use of two wrenches is recommended whenever plumbing fittings are tightened or loosened This will help avoid twists and kinks in the tubing Makecertainthatallplumbingconnectionsaresealedandelectricalconnectionstightandisolated This brewer is heated at all times Keep away from combustibles WARNING Exercise extreme caution when servicing electrical equipment Disconnect power sourc...

Page 9: ...vice Brew selector switch for testing procedures See page 16 Checkplumbingandshut offvalves A Direction of flow arrow must be pointing towards brewer B Remove the strainer flow con trolandcheckforobstructions Clear or replace Refer to Service Overflow protec tion switch for testing procedures See page 25 RefertoService Levelcontrolboard for testing procedures See page 26 Refer to Service Solenoid ...

Page 10: ...r to Service Control thermo statfortestingprocedures Seepage 22 Refer to Service Contactor for test procedures See page 20 Refer to Service Tank heater for testing procedures See page 34 Refer to Service Control thermo statfortestingprocedures Seepage 22 Inspect the tank assembly for ex cessive lime deposits Delime as required Probable Cause 1 Brew selector switch 1 Timer 1 Levelcontrolboardandlev...

Page 11: ...s Clear or replace Check the operating water pressure tothebrewer Itmustbebetween20 and 90 psi 138 and 620 kPa Refer to Service Dispense valve for testing procedures See page 24 Adjust the timer as required to achieve the recommended volume for each brew cycle Refer to Service Dispense valve for testing procedures See page 24 RefertoAdjustmentsonpage4step 7 For test procedures see page 15 BUNN pap...

Page 12: ...l and the bed of groundcoffeeleveledbygentleshak ing Empty the server remove its cover Place empty funnel over the server entrance with ON OFF switch in the ON position press the start switch and release it Check the water tem perature immediately below the sprayhead with a thermometer The readingshouldnotbelessthan195 F 91 C The nut on back of the solenoid must be tight or it will vibrate during ...

Page 13: ...medy A Check and reset if necessary B Refer to Service Circuit breaker for test procedures See page 18 Clean or replace See page 29 Refer to Service Relay Server Power fortestprocedures Seepage 31 Refer to Service Transformer for test procedures See page 35 Refer to Service Rectifier for test procedures See page 30 Problem Server will not heat 28230 092200 ...

Page 14: ... NE CT FR OM PO W ER SO UR CE BE FO RE RE M OV AL OF AN Y PA NE L OR RE PL AC EM EN T OF AN Y CO M PO NE NT W A R N IN G COMPONENT ACCESS WARNING Disconnect the brewer from the power source before the removal of any panel or the replace ment of any component All components are accessible by the removal of the top cover front inspection panel and server plat form The top cover is attached with one ...

Page 15: ...d release the brew switch The indication must be P774 FIG 2 BYPASS VALVE FIG 3 BYPASS VALVE TERMINALS 22978 0000 TL5 TL4 TL3 TL2 TL1 J2 J1 SET LOCK LOCK SET 1 2 3 4 5 6 P2230 WHI GRN to Dispence Valve WHI VIO to Brew Selector Switch 28230 031201 a 120 volts ac for two wire 120 volt models 208 volts ac for three wire 120 208 volt models and 240 volts ac for three wire 120 240 volt models b 200 to 2...

Page 16: ...ion 9 Check for continuity across the pink wire and gray wire on the selector switch when the switch is in the 1 gallon position Continuity must not be present in any other position 10 Reconnect the pink gray and tan wires on the selector switch to the pink gray and tan wires on the interface Bypass Valve 11 Disconnect the white violet wire on the selector switch from the bypass valve coil and dis...

Page 17: ...alve 3 Loosen the set screw on the switch knob 4 Remove the 9 16 nut and washer holding the switch to the hood 5 Remove the switch 6 Installthenewswitch Thepositioningtabmustbe in the hole in the hood for proper switch and knob alignment 7 Install the knob so that the arrow lines up in the 1 1 2 or 1 3 4 gallon position when the switch is turned to the full right position 8 Reattach the connector ...

Page 18: ...K to Transformer 12 BLU BLK to Rectifier AC CAUTIO N DIS CA RD DE CA NT ER IF CR AC KE D SC RA TC HE D BO ILE D DR Y HE AT ED WH EN EM PT Y US ED ON HIG H FLA ME OR EX PO SE D EL EC TR IC EL EM EN TS FA ILU RE TO CO MP LY RIS KS INJ UR Y PN 658 198 5 BUN N O MA TIC COR POR ATIO N FU NN EL CO NT EN TS AR E HO T CA UT IO N HO T WA TE R D IS C O N N EC T FR O M PO W ER SO U R C E BE FO R E R EM O VA ...

Page 19: ...ibed press the reset button on the limit thermostat and repeat step 3 After repeating step 3 and no continuity is shown replace the limit thermostat FIG 8 LIMIT THERMOSTAT 22978 0000 TL5 TL4 TL3 TL2 TL1 J1 1 2 3 4 5 6 P2230 P833 FIG 9 LIMIT THERMOSTAT TERMINALS BLK to Terminal Block Black Insert BLK to Tank Heater Left Terminal BLK to Contactor Terminal SERVICE cont LIMIT THERMOSTAT Removal and Re...

Page 20: ...actor coil If continuity is present as described reconnect one black wire to the white wire or red wire from the terminal block and the other black wire to the black wire from the control thermostat Reinstall capillary tube into tank to line 7 above the bulb and proceed to 7 If continuity is not present as described replace the contactor 7 Locate the white wire or red wire on L1 terminal andblackw...

Page 21: ...contactor Removal and Replacement 1 Remove all wires from the contactor 2 Removethetwo 10 32slottedheadscrewsecur ing contactor to the inside of the hood 3 Securely install the new contactor inside the hood 4 Refer to Fig 11 when reconnecting the wires SERVICE cont CONTACTOR ASSEMBLY P828 FIG 11 CONTACTOR ASSEMBLY TERMINALS 28230 092200 ...

Page 22: ...age is present as described reconnect the wire and proceed to 5 If voltage is not present as described refer to the wiring diagrams and check the brewer wiring harness 5 Locate the black wires on the control thermostat 6 Gently remove the capillary bulb and grommet from the tank 7 Check the voltage across the black wire of the control thermostat and the white insert on the two pole or three pole 1...

Page 23: ...acket 4 Slide the grommet to the line 7 above the bulb on the new capillary tube 5 Insert the capillary bulb through the hole in the tank lid and press the grommet firmly and evenly so that the groove in the grommet fits into the tank lid 6 Carefully bend the capillary tube so that the tube andbulbinsidethetankareintheverticalposition NOTE The capillary tube must be clear of any electri cal termin...

Page 24: ...OFF Switch WHI RED to Brew Selector Switch WHI GRN to Timer TL4 WHI GRN to By Pass Valve 28230 092200 4 Checkforcontinuityacrossthedispensevalvecoil terminals If continuity is present as described reconnect the wires to the dispense valve and proceed to 5 If continuity is not present as described replace the dispense valve 5 Check the dispense valve for coil action Connect the brewer to power sour...

Page 25: ...the level control board and terminal block Test Procedure 1 Disconnect the brewer from the power source 2 Remove the wire nuts connecting the red wires from the overflow protection switch to the black wirefromtheterminalblockandbluewirefromthe thermostat 3 Check for continuity across the overflow protec tion switch red wires only until the plastic float is raised and check that continuity returns ...

Page 26: ...hebrewertothepowersource The indication must be a 120 volts ac for two wire 120 volt models three wire 120 208 volt models and three wire 120 240 volt models after a delay of approximately 1 sec ond b 200 to 240 volts ac for two wire 200 230 or 240 volt models after a delay of approximately 1 second 8 Touch the free end of jumper wire to the brewer housing The indication must be 0 9 Move the jumpe...

Page 27: ...ely 1 sec ond 17 Disconnect the brewer from the power source If voltage is present as described reinstall the probe the level control board and level probe are operating properly If voltage is not present as described check the pink probe wire for continuity 28230 092200 Removal and Replacement 1 Remove all wires from the level control board 2 Remove two 8 32 slotted head screws and lockwashers ho...

Page 28: ... is present as described reconnect the black wire to the center terminal and the white violet wire on the switch to the lower left terminal If continuity is not present as described replace the switch Removal and Installation 1 Remove the wires from the switch terminals 2 Compress the clips inside the hood and gently push the switch through the opening 3 Push the new switch into the opening and sp...

Page 29: ... 658 198 5 BUN N O MA TIC COR POR ATIO N FU NN EL CO NT EN TS AR E HO T P1357 BLK to Terminal on Right Rectifier RED to Terminal on Right Rectifier Rectifier Rectifier Removal and Replacement 1 Disconnect the brewer from the power source 2 Disconnect the wires from the receptacle assem bly 3 Remove the two 6 32 flat head screws securing the receptacle to the server platform 4 Remove and discard re...

Page 30: ...bed the rectifier is operating properly If voltage is not present as described refer to the brewer wiring diagrams and check the brewer wiring harness TL5 TL4 TL3 TL2 TL1 J2 J1 SET LOCK LOCK SET 1 2 3 4 5 6 1 2 3 4 5 6 BUNN90 psig max operating pressure Strainer Flow Control 22300 033 0 Repl Flow Washer 20526 0330 Repl Screen 23721 0000 500 gpm FLOW P2230 RED to Server Connector BLU BLK to Transfo...

Page 31: ...6 P2230 If continuity is not present as described replace the relay 5 Disconnect the white yellow from terminal 6 and white orange wire from terminal 9 on the relay 6 Check for continuity across terminals 6 and 9 of the relay by manually closing the relay contacts Continuity must not be present when the contacts are released If continuity is present as described reconnect the white yellow wire to ...

Page 32: ...8V 120 240V Models Red to Level Control Board T3 200 or 240V Models 28230 092200 If continuity is present as described reconnect the white and violet wires on 120 120 208 and 120 240 volt brewers red and violet wires on 200 230 or 240 volt brewers If continuity is not present as described replace the solenoid valve 6 Check the solenoid valve for coil action Connect the brewer to the power source L...

Page 33: ...acement 1 Remove all wires from the switch terminals 2 Compress the clips inside the hood and gently push the switch through the opening 3 Push the new switch into the opening and spread the clips to hold the switch in the hood 4 Refer to Fig 31 when reconnecting the wires SERVICE cont P1386 FIG 31 START SWITCH TERMINALS P1357 FIG 30 START SWITCH TIO N CA NT ER CA UT IO N HO T WA TE R D IS C O N N...

Page 34: ...ee wire 120 240 volt models b 200 to 240 volts ac for two wire 200 230 or 240 volt models 3 Disconnect the brewer from the power supply If voltage is present as described proceed to 4 If voltage is not present as described refer to the wiring diagrams and check the wiring harness 4 Disconnect wires from the tank heater 5 Check for continuity across the terminals of the tank heater If continuity is...

Page 35: ... operating properly If voltage is not present as described replace the transformer Removal and Replacement 1 Disconnect all the wires from the transformer 2 Remove the two 6 32 screws and the two 6 32 keps nuts securing the transformer to the brewer base plate 3 Remove transformer and discard 4 Install new transformer on the brewer base plate securing with two 6 32 screws and two 6 32 keps nuts 5 ...

Page 36: ...4 white yellow wire to TL5 and proceed to 5 If voltage is not present as described refer to the wiring diagrams and check the brewer wiring harness 5 Place an empty server under the funnel and select 1 2 gallon position on selector switch 6 Check the voltage across terminals TL1 and TL4 withavoltmeterwhenthe ON OFF switchisinthe ON position Connect the brewer to the power source and press the star...

Page 37: ...ng circuit board and dial plate on to the compo nent mounting bracket 3 Remove circuit board nylon spacers and dial plate 4 Install new timer circuit board as described in Digital Timer section on the following pages 5 Refer to Fig 39 when reconnecting wires 6 Install the timer setting decal provided with the replacement timer kit on the inside of the front access panel 7 Adjust timer as required ...

Page 38: ...ck the voltage across termi nals TL1 and TL4 when the ON OFF switch is in the ON position Connectthebrewertothepower source The indication must be 0 volts If voltage is as described proceed to 7 If voltage is not as described disconnect the brewer from the power source and replace the timer 7 With a voltmeter check the voltage across termi nals TL1 and TL4 when the ON OFF switch is in the ON posit...

Page 39: ...press and release the START switch once for every two second interval to be removed from the total brew time period then immediately press and hold down the START 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 ...

Page 40: ...ONNECTION TAN GRY PNK WHI VIO 1 4 BATCH 1 3 BATCH 1 2 BATCH 2 3 BATCH 3 4 BATCH BATCH COMMON S E L E C T O R S W WHI ORA WHI GRN WHI YEL WHI RED 1 2 3 4 5 BREW TIMER WHI WHI VIO WHI WHI WHI VIO WHI GRN WATER BYPASS WHI RED WHI VIO WHI VIO REFILL 4 3 2 1 TANK HEATER K1 K1 N O SW THERMOSTAT 1 2 3 4 LIQUID LEVEL BOARD SOL DISPENSE START SWITCH SOL ON OFF SWITCH K2 GRN AC AC RECTIFIER 4 AMP TRANSFORME...

Page 41: ...TCH 1 2 BATCH 2 3 BATCH 3 4 BATCH BATCH COMMON S E L E C T O R S W WHI ORA WHI GRN WHI YEL WHI RED 1 2 3 4 5 BREW TIMER RED WHI VIO RED RED RED RED WHI VIO WHI GRN WATER BYPASS WHI RED WHI VIO REFILL 4 3 2 1 TANK HEATER K1 K1 N O SW THERMOSTAT 1 2 3 4 LIQUID LEVEL BOARD SOL DISPENSE SOL ON OFF SWITCH AC AC RECTIFIER 4 AMP TRANSFORMER RED BLK BLU BLK BLU BLK RESETTABLE FUSE BLK BLK BLK BLK 12 11 1 ...

Page 42: ...D FULL BATCH NO CONNECTION TAN GRY PNK WHI VIO 1 4 BATCH 1 3 BATCH 1 2 BATCH 2 3 BATCH 3 4 BATCH BATCH COMMON S E L E C T O R S W WHI ORA WHI GRN WHI YEL WHI RED 1 2 3 4 5 BREW TIMER WHI WHI VIO WHI WHI WHI VIO WHI GRN WATER BYPASS VALVE WHI RED WHI VIO REFILL VALVE 4 3 2 1 TANK HEATER K1 K1 N O SW THERMOSTAT 1 2 3 4 LIQUID LEVEL BOARD SOL DISPENSE VALVE START SWITCH SOL ON OFF SWITCH AC AC RECTIF...

Page 43: ...ED 1 2 3 4 5 BREW TIMER WHI BLK WHI VIO RED RED RED RED WHI VIO WHI GRN WATER BYPASS VALVE WHI RED WHI VIO REFILL VALVE 4 3 2 1 TANK HEATER K1 K1 N O SW THERMOSTAT 1 2 3 4 LIQUID LEVEL BOARD SOL DISPENSE VALVE SOL ON OFF SWITCH AC AC RECTIFIER 4 AMP TRANSFORMER RED BLK BLU BLK BLU BLK BLK BLK 12 11 1 2 5 6 7 8 Front view of Brewer Server Connector 24VDC N C GRY TAN PNK TANK HEATER CONTACTOR CIRCUI...

Page 44: ...HEATER BLK WHI WHI BLK RED BLK WHI OPTIONAL BYPASS P1 P3 TAN GRY PNK GRINDER INTERFACE CONNECTOR GRY TAN PNK 4 1 2 3 P4 P2 WHI RED WHI VIO WHI OVERFLOW PROTECTION SWITCH D I G I T A L B R E W E R C O N T R O L C I R C U I T B O A R D SOL REFILL TRIAC 208 0R 240V A C 120V A C 120V A C SOL SOL LIMIT THERMOSTAT S W I T C H S E L E C T B A T C H SINGLE SH BREWER W DIGITAL BREWER CONTROL SCHEMATIC WIRI...

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