Bunn CWT TWIN Operating & Service Manual Download Page 34

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Page 34

BLK

WHI/RED

WHI/GRN

P1-2

P1-3

P4-2

P4-3

SCHEMATIC WIRING DIAGRAM

CWTFA & CWTFB TWIN 2/2 & 4/2

GRN/YEL

(FAUCET)

THERMAL

FUSE

BLK

RIGHT TANK HEATER

BLK

RED

BLU

BLK

SW2

RT. LIMIT

THERMOSTAT

RT. READY INDICATOR

RT. SW. & THERMOSTAT

BLK

RED

200 OR 240 VOLTS AC 2 WIRE

SINGLE PHASE

RED

MODEL 4/2 ONLY

BLK

SW9

LEFT TOP REAR WARMER

P5-2

P5-3

SW10

BLK

RIGHT TOP REAR WARMER

RED

P5-1

WHI/VIO

WHI/BRN

RED

LEFT TOP FRONT WARMER

RIGHT TOP FRONT WARMER

RED

P4-1

YEL

WHI/YEL

RED

BLK

SW7

SW8

BLK

P2-3

BLK

WHI/GRN

WHI/BLU

SOL

BLU

BLU/BLK

LEFT

BREW TIMER

P2-1

SW5

WHI/RED

RED

LEFT LOWER WARMER

RIGHT LOWER WARMER

RED

P1-1

WHI/RED

WHI/GRN

RED

SW3

SW4

BLK

P3-3

BLK

WHI/GRN

WHI/BLU

SOL

BLU

BLU/BLK

WHI

RIGHT

BREW TIMER

P3-1

P3-2

RED

SW6

WHI/GRN

WHI

P2-2

RED

LEFT TANK HEATER

RED

BLU

BLK

SW1

LT.LIMIT

THERMOSTAT

LT. READY INDICATOR

LT. SW. & THERMOSTAT

BLK

RED

BLU

BLK

T1 T5 T3 T4

T1 T5 T3

T4
T2

10737 120100

Summary of Contents for CWT TWIN

Page 1: ...D BOIL ED DRY BOIL ED DRY HEA TED WHE N EMP TY HEA TED WHE N EMP TY USE D ON HIGH FLA ME USE D ON HIGH FLA ME OR EXP OSE D ELE CTR IC OR EXP OSE D ELE CTR IC ELE MEN TS ELE MEN TS PN 658 PN 658 1985 BUNN O MA TIC CORP ORAT ION 1985 BUNN O MA TIC CORP ORAT ION ON L OWE R ON LOW ER TOP STA RT ON LOW ER TOP STA RT ON ON OF F OF F T A N K CA UT IO N CA UT IO N DIS CAR D DEC ANT ER DIS CAR D DEC ANT ER...

Page 2: ...RANTY 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 cla...

Page 3: ...ully read and follow all notices in this manual and on the equipment All labels on the equipment should be kept in good condition Replace any unreadable or damaged labels 12364 0000 00658 0000 00656 0000 00831 0000 10737 121598 ...

Page 4: ...d 2 Using a voltmeter check the voltage and color coding of each conductor at the electrical source 3 Place the heater switchs at the rear of the brewer in the OFF lower position 4 Remove the front panel beneath the sprayheads 5 Feed the cord through the strain relief s and connect it to the terminal block s 6 Connectthebrewertothepowersourceandverifythevoltageattheterminalblockbeforeproceeding Re...

Page 5: ...itting on the bottom of the center tube assembly 2 Flush the water line and securely attach it to the flare fitting on the center tube assembly 3 Turn on the water supply 4 On models with faucet place an empty vessel beneath the faucet and lift the handle until water is dispensed ON OFF T A N K This eq uipm en t is to be installed to co mply with the Bas ic Plumbing Cod e of the Building Officials...

Page 6: ...uld be 64 ounces 9 If not adjust the timer as required Refer to Adjusting Brew Volumes 10 Repeat steps 8 9 until 64 oz water volume is achieved NOTE Repeat steps 1 through 10 for the other side 11 The brewer is now ready for use in accordance with the coffee brewing instructions on the next page 10737 100801 ADJUSTING BREW VOLUMES CAUTION Disconnect the power source from the brewer prior to the re...

Page 7: ...always remain open 3 With the sprayhead removed insert the deliming spring provided all the way into the sprayhead tube When inserted properly no more than two inches of spring should be visible Saw back and forth five or six times 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 2 Setting batch sizes To set a b...

Page 8: ...wrenchesisrecommendedwheneverplumbingfittingsaretightenedorloosened Thiswillhelp to avoid twists and kinks in the tubing Make certain that all plumbing connections are sealed and electrical connections tight and isolated This brewer is heated at all times Keep away from combustibles WARNING Exercise extreme caution when servicing electrical equipment Unplug the brewer when servicing except when el...

Page 9: ...k for obstructions Clear or replace Refer to Service Tank Heater Switchfortestingprocedures See page 22 Refer to Service Limit Thermo stat for testing procedures See page 16 Refer to Service Control Ther mostatfortestingprocedures See page 15 Refer to Service Tank Heater for testing procedures See page 21 Refer to Service Recovery Booster for testing procedures See page 18 3 ON OFF Switch 4 Start ...

Page 10: ...ld up on stainless steel surfaces can initiatecorrosivereactionsresult ing in serious leaks REMEDY A Direction of flow arrow must be pointing towards the brewer B Remove the strainer flow con trol and check for obstruction Clear or replace Thebrewermustbelevelorslightly lower in front to syphon properly Inspect the tank assembly for ex cessive lime deposits Delime as required The water pressure to...

Page 11: ...enser 2 Timer 3 Solenoid Valve REMEDY Refer to Service Control Ther mostatfortestingprocedures See page 15 Thebrewermustbelevelorslightly lower in front to syphon properly Inspect the tank assembly for ex cessive lime deposits Delime as required Remove the solenoid valve and clear any obstructions Rebuild or replace the valve if necessary See page 19 RefertoService Timerfortesting procedures See p...

Page 12: ...le shak ing Placeanemptyfunnelonanempty dispenser beneath the sprayhead Initiate a brew cycle and check the water temperature immediately below the sprayhead with a ther mometer The reading should not be less than 195 F 91 C Adjust the control thermostat to increase the water temperature Replace if necessary The BUNN paper filter must be centered in the funnel and the bed ofgroundsleveledbygentlys...

Page 13: ...r is making unusal noises cont Low beverage serving tempera ture PROBABLE CAUSE 4 Tank Heater 1 Warmer REMEDY Remove and clean lime off the tank heater See page 21 Refer to Service Warmer ele ment for testing procedures See page 27 10737 120800 ...

Page 14: ...r 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 warmer plate s The top cover is attached with two 4 40 screw The front inspection panel is attached with five 8 32 screws The warmer assembly is attached with three 4 40 s...

Page 15: ...re 120 240 volt models b 200 volts ac for two wire 200 volt volt models c 240 volts ac for two wire 240 volt models d 230 volts ac for three wire three phase 230 volt models 6 Disconnect the brewer from the power source Ifvoltageispresentasdescribed reinstallthecapillary tube into the tank to the line 4 5 above the bulb the control thermostat is operating properly If voltage is not present as desc...

Page 16: ...at 3 Withanohmmeter checkforcontinuityacrossthe limit thermostat terminals If continuity is present as described the limit thermo stat is operating properly If continuity is not present as described replace the limit thermostat Removal and Replacement 1 Remove all wires from limit thermostat terminals 2 Carefully slide the limit thermostat out from under the retaining clip and remove limit thermos...

Page 17: ...nd Replacement 1 Remove the wires from the switch terminals 2 On models with faucet turn off water supply and remove faucet 3 Remove front end cap 4 Compress the clips inside the hood and gently push the switch through the opening 5 Push the new switch into the opening and spread the clips to hold switch in the hood 6 Reinstall front end cap 7 Onmodelswithfaucetreinstallfaucetandconnect brewer to ...

Page 18: ...minals Connectthebrewertothepower source With the ON OFF switch in the ON positionandthestartswitchpressedandreleased check for continuity across relay terminals 7 Disconnect the brewer from the power source If continuity is present as described reconnect the blue and black wires to the relay contact terminals If continuity is not present as described replace the relay Removal and Replacement 1 Re...

Page 19: ...mer P1132 6 Check the solenoid valve for coil action Connect the brewer to the power source With ON OFF switchinthe ON upperpositionpressstartswitch and listen carefully in the vicinity of the solenoid valve for a clicking sound as the coil magnet attracts 7 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 b...

Page 20: ...ss these ter minals in the upper position If continuity is present as described reconnect the blue wire to the top terminal and the white red wire to the bottom terminal If continuity is not present as described replace the switch Removal and Replacement 1 Remove the blue wire and white red wire from the start switch 2 On models with faucet turn off the water supply and remove faucet 3 Remove fron...

Page 21: ...ATER 10737 120800 1 2 3 4 5 FIG 15 FILL BASIN P1238 1 Splash Guard 2 Tank Inlet Fitting 3 Tank Inlet Gasket 4 Fill Basin 5 Fill Tube Assembly Removal and Replacement 1 Disconnect the water supply tube 5 from the fill basin 4 2 Remove the tank inlet fitting 2 securing the fill basin 4 to the tank lid remove fill basin 4 splash guard 1 and tank inlet gasket 3 Set all parts aside for reassembly 3 On ...

Page 22: ...for reas sembly 7 Remove the eight 8 32 nuts securing the tank lid to the tank 8 Remove the tank lid with limit thermostat spray head tube tank heater coil assembly and control thermostat w bracket early models only 9 Remove the two hex nuts securing the tank heater to the tank lid Remove tank heater with gaskets and discard 10 Install new tank heater with gaskets on the tank lid and secure with t...

Page 23: ...met in the tank lid 10 Remove the two 8 32 screws securing the tank assembly to the hood 11 Lift tank and components out as an assembly and set aside for reassembly 12 Disconnect the two black wires from the tank heater switch 13 Remove the plastic facenut hex facenut and the switch indicator guard bracket that secures tank heater switch to the rear of the brewer Remove switch and discard 14 Inser...

Page 24: ...wo wire 240 volt models d 230 volts ac for three wire three phase 230 volt models FIG 19 TIMERS P1233 FIG 20 TIMER TERMINALS 10737 120800 To Main Harness WHI to Solenoid Valve BLK to Solenoid Valve 6 Disconnect the brewer from the power source 7 Reconnect the three pin connector from main wiring harness to the timer If voltage is present as described proceed to 7 If voltage is not present as descr...

Page 25: ...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 position Connectthebrewertothepower source and press the START switch The indica tion must be as follows a 120 volts ac for three wire 120 240 volt models b 200 volts ac for two...

Page 26: ... 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 th...

Page 27: ...ring the warmer assembly to the brewer 2 Lift the warmer assembly from the brewer 3 Disconnect the two wires from the warmer ele ment terminals 4 Remove the two 8 32 nuts securing the warmer element to the warmer plate 5 Securely install new warmer element 6 Reconnectthetwowirestowarmerelementtermi nals 7 Securely install warmer assembly on the brewer 8 Refer to Fig 24 when reconnecting the wires ...

Page 28: ...OP REAR WARMER WHI P5 1 WHI VIO WHI VIO WHI BRN WHI BRN WHI WHI RED WHI WHI WHI LEFT TOP FRONT WARMER RIGHT TOP FRONT WARMER WHI P4 1 YEL YEL WHI YEL WHI YEL WHI WHI RED SW7 SW8 BLK P2 3 BLK WHI BLU LT SOL BLU BLU BLK LEFT BREW TIMER P2 1 SW5 WHI RED WHI RED RED WHI WHI WHI WHI P1 1 WHI GRN WHI WHI RED SW3 SW4 BLK RIGHT KEEP WARM HEATER WHI P3 3 BLK WHI BLU RT SOL BLU BLU BLK WHI WHI GRN RIGHT BRE...

Page 29: ...K RT SOL WHI BLK K2 WHI BLK P2 3 BLK LT SOL BLU BLU BLK LEFT BREW TIMER P2 1 SW5 WHI RED WHI RED RED WHI WHI WHI SW3 WHI RED WHI GRN P1 2 P1 3 LEFT LOWER WARMER RIGHT LOWER WARMER WHI P1 1 WHI RED WHI GRN WHI WHI RED SW4 BLK RIGHT KEEP WARM HEATER WHI WHI WHI WHI GRN P2 2 WHI WHI P3 3 BLK RT SOL BLU BLU BLK WHI WHI GRN RIGHT BREW TIMER P3 1 P3 2 SW6 WHI GRN WHI GRN WHI BLK K1 WHI BLK RIGHT TANK HE...

Page 30: ...HEATER WHI WHI RED WHI RED WHI RED P2 3 BLK WHI GRN WHI BLU SW6 SW5 BLU BLU BLK LEFT BREW TIMER P2 1 WHI P2 2 P4 2 P4 3 10741 0000F 12 00 1993 BUNN O MATIC CORPORATION 120 240 VOLTS AC 3 WIRE SINGLE PHASE N WHI WHI WHI WHI WHI WHI WHI LEFT FRONT WARMER LEFT REAR WARMER SW9 RIGHT FRONT WARMER P5 2 P5 3 SW10 BLK RIGHT REAR WARMER WHI BRN BLK VIO WHI BLK P3 1 P3 3 BLK WHI BLU BLU BLU BLK SW7 SW8 RED ...

Page 31: ...RN BLU BLU BLK WHI BLK WHI RED SW3 L SW2 L BLK WHI P1 1L P1 2L P1 3L WHI RED WHI BLU WHI RED WHI GRN BLU BLU BLK WHI BLK WHI RED SW3 R SW2 R BLK WHI P1 1R P1 2R P1 3R WHI RED WHI BLU RIGHT BREW WARMER WHI WHI RED WHI BLK LEFT FRONT WARMER VIO LEFT REAR WARMER SW4 L P2 2L BRN BLK SW5 L P2 3L WHI VIO BLK P2 1L WHI WHI RIGHT FRONT WARMER BRN BLK VIO RIGHT REAR WARMER SW4 R BLK P2 2R BRN BLK P2 1R SW5...

Page 32: ...HI RED WHI RED WHI RED P2 3 BLK WHI SW6 SW5 BLU BLU BLK LEFT BREW TIMER P2 1 WHI P2 2 LT SOL P4 2 P4 3 27693 0000C 12 00 1996 BUNN O MATIC CORPORATION 120 240 VOLTS AC 3 WIRE SINGLE PHASE N WHI WHI WHI WHI WHI WHI WHI LEFT FRONT WARMER LEFT REAR WARMER SW9 RIGHT FRONT WARMER P5 3 P5 2 SW10 BLK RIGHT REAR WARMER WHI BRN BLK VIO WHI BLK P3 1 P3 3 BLK BLK BLU BLU BLK RIGHT BREW TIMER SW8 SW7 RED RED ...

Page 33: ...ONT WARMER RIGHT TOP FRONT WARMER RED P4 1 YEL YEL WHI YEL WHI YEL RED RED BLK SW7 SW8 BLK P2 3 BLK WHI GRN WHI BLU BLU BLU BLK LEFT BREW TIMER P2 1 SW5 WHI RED WHI RED RED RED RED LEFT LOWER WARMER RIGHT LOWER WARMER RED P1 1 WHI RED WHI GRN RED RED SW3 SW4 BLK RIGHT KEEP WARM HEATER WHI WHI P3 3 BLK WHI GRN WHI BLU RT SOL BLU BLU BLK WHI RIGHT BREW TIMER P3 1 P3 2 RED SW6 WHI GRN WHI GRN WHI P2 ...

Page 34: ... WARMER RED P5 1 WHI VIO WHI VIO WHI BRN WHI BRN RED RED RED RED RED LEFT TOP FRONT WARMER RIGHT TOP FRONT WARMER RED P4 1 YEL YEL WHI YEL WHI YEL RED RED BLK SW7 SW8 BLK P2 3 BLK WHI GRN WHI BLU LT SOL BLU BLU BLK LEFT BREW TIMER P2 1 SW5 WHI RED WHI RED RED RED RED LEFT LOWER WARMER RIGHT LOWER WARMER RED P1 1 WHI RED WHI GRN RED RED SW3 SW4 BLK P3 3 BLK WHI GRN WHI BLU RT SOL BLU BLU BLK WHI RI...

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