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Bunn CWTF TWIN - page 1
CWT TWIN CWTF TWIN CWTF TWIN-APS ...
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Bunn CWTF TWIN - page 2
Page 2 INTRODUCTION This equipment will brew one or two half-gallon batches of coffee simultaneously into awaiting dispensers (with just the press of a button). One side may include a hot water faucet for allied beverage use. It is only for indoor use on a sturdy counter . BUNN-O-MA TIC COMMERCIAL PRODUCT WARRANTY Bunn-O-Matic Corp. (“BUNN”) wa ...
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Bunn CWTF TWIN - page 3
Page 3 USER NOTICES Carefully 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 ...
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Bunn CWTF TWIN - page 4
Page 4 ELECTRICAL HOOK-UP CAUTION – Improper electrical installation will damage electronic components. 1. An electrician must provide electrical service as specifi ed. 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" ...
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Bunn CWTF TWIN - page 5
Page 5 Models CWT & CWTF PLUMBING REQUIREMENTS These brewers must be connected to a cold water system with operating pressure between 20 and 90 psi (138 and 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 90 p ...
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Bunn CWTF TWIN - page 6
Page 6 INITIAL SET -UP CAUTION - The brewer must be disconnected from the power sour ce throughout the initial set-up, except when specifi ed in the instructions. 1. Insert an empty funnel into the funnel rails. 2. Place an empty dispenser under the funnel. 3. Place the heater switch at the rear of the brewer in the "OFF" lower position. ...
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Bunn CWTF TWIN - page 7
Page 7 10737 100801 OPERA TING CONTROLS ON/OFF SWITCH Placing the "ON/OFF" switch in the "OFF" lower position stops brewing. Stopping a brew cycle after it has been started will not stop the fl ow of water into the funnel until the tank syphons down to its proper level. Plac- ing the switch in the "ON" upper position ...
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Bunn CWTF TWIN - page 8
Page 8 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 T echnical Service Department. • Inspection, testing, and repair of electrical equipment should be performed only b ...
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Bunn CWTF TWIN - page 9
Page 9 TROUBLESHOOTING (cont.) PROBLEM Brew cycle will not start (cont.) Water is not hot PROBABLE CAUSE REMEDY 10737 120800 Refer to Service - ON/OFF Switch for testing. See page 16 Refer to Service - Start Switch for testing procedures. See page 20 Refer to Service - Timer for testing procedures. See page 24 or 25 Refer to Service - Solenoid Valv ...
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Bunn CWTF TWIN - page 10
Page 10 TROUBLESHOOTING (cont.) PROBLEM Inconsistent beverage level in dispenser Consistently low beverage level in the dispenser Spitting or excessive steaming PROBABLE CAUSE 1. Strainer/flow control (.222 GPM) 2. Syphon System 3. Lime Build-up CAUTION - T ank and tank compo- nents should be delimed regularly depending on local water condi- tions. ...
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Bunn CWTF TWIN - page 11
Page 11 TROUBLESHOOTING (cont.) PROBLEM Spitting or excessive steaming (cont.) Dripping from sprayhead Water fl ows into tank continuously (ON/OFF Switch "ON") Water fl ows into tank continuously (ON/OFF Switch "OFF") Beverage overfl ows dispenser PROBABLE CAUSE 2. Control Thermostat 1. Syphon System 2. Lime Build-up CAUTION ...
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Bunn CWTF TWIN - page 12
Page 12 TROUBLESHOOTING (cont.) PROBLEM Weak beverage Dry coffee grounds remain in the funnel Brewer is making unusal noises PROBABLE CAUSE 1. Filter T ype 2. Coffee Grind 3. Sprayhead 4. Funnel Loading 5. Water T emperature 1. Funnel Loading 1. Solenoid 2. Plumbing Lines 3. Water Supply REMEDY BUNN ® paper fi lters must be used for proper extrac ...
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Bunn CWTF TWIN - page 13
Page 13 TROUBLESHOOTING (cont.) PROBLEM Brewer is making unusal noises (cont.) Low beverage serving tempera- ture PROBABLE CAUSE 4. T ank 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 ...
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Bunn CWTF TWIN - page 14
Page 14 O N O N O F F OFF T A N K C AU T IO N : W A R M E R S A ND S U R F A C E S A R E H O T CA UT I O N C A U T I ON D I S C A R D D E C AN T E R D I S C A R D D E C AN T E R I F : I F : . CRA CKE D . CR AC K E D . S C RA T C H E D . S C R A T C H E D . B O I L E D DR Y . B O I LE D D R Y . H E A T E D W HE N E M P T Y . HE A T E D W H E N E M P ...
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Bunn CWTF TWIN - page 15
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Bunn CWTF TWIN - page 16
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Bunn CWTF TWIN - page 17
Page 17 SERVICE (cont.) 10737 100801 ON/OFF SWITCHES (cont.) T est Procedure: 1. Disconnect the brewer from the power source. 2. Viewing the switch from the back remove the white or red wire from the upper terminal and the black wire from the center terminal. 3. With a voltmeter , check the voltage across the white wire or red wire and the black wi ...
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Bunn CWTF TWIN - page 18
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Bunn CWTF TWIN - page 19
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Bunn CWTF TWIN - page 20
Page 20 APS Models ST ART SWITCHES SERVICE (cont.) ...
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Bunn CWTF TWIN - page 21
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Bunn CWTF TWIN - page 22
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Bunn CWTF TWIN - page 23
Page 23 SERVICE (cont.) 10737 120800 Diagrams and check the brewer wiring harness. 5. Check for continuity between the black wire re- moved from the limit thermostat and the black insert on the terminal block. with the tank heater switch in the "ON" upper position. Continuity should not be present in the "OFF" lower position. If ...
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Bunn CWTF TWIN - page 24
Page 24 O N ON O F F O F F T A N K USE COPPER WIRE ONLY FOR POWER SUPPLY CONNECTIONS USE COPPER WIRE ONLY FOR POWER SUPPLY CONNECTIONS 1 2 3 4 5 .5 MINUTES BUNN-O-MATIC P/N 2235-120 VAC 1 2 3 4 5 .5 MINUTES BUNN-O-MATIC P/N 2235-120 VAC ...
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Bunn CWTF TWIN - page 25
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Bunn CWTF TWIN - page 26
Page 26 10737 120800 BLU/BLK wire from TL5 to P1 WHI/GRN wire from TL4 to (WHI) Solenoid WHI/BLU wire from TL3 to (BLK) Solenoid WHI wire from TL2 to P2 BLK wire from TL1 to P3 FIG. 22 DIGIT AL TIMER WIRING P2037 DIGIT AL BREW TIMER (Late Models)(cont.) SERVICE (cont.) 1. Modifying brew volumes. T o modify a brew vol- ume, fi rst check that the SE ...
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Bunn CWTF TWIN - page 27
Page 27 O N ON O FF O F F T A N K C A U T I O N : W A R M E R S A N D S U R F AC E S A R E H OT C A U T IO N CAU TI ON DI SCAR D DE C A NT E R D I SC A RD D ECA N T E R I F : I F : . C R AC K E D . CR A C K ED . S C R A T C H E D . S C R A T C H E D . B O I L E D D R Y . B O I LE D D R Y . H E A T E D W H E N E M PT Y . H E A T E D W H E N E M P T ...
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Bunn CWTF TWIN - page 28
Page 28 WHI/RED (NOT AVAILABLE ON CWT TWIN-AP S ) LEFT LOWER WARMER WHI/RED WHI/GRN P1-2 P1-3 P4-2 P4-3 SCHEMATIC WIRING DIAGRAM CWT/CWTF TWIN 0/2, 2/2, 4/2 & CWT TWIN-APS L1 GREEN N L2 (FAUCET) THERMAL S AFETY FU S E BLK RIGHT TANK HEATER BLK BLK BLK RED BLU BLK BLK S W2 RT. LIMIT THERMO S TAT RT. READY INDICATOR RT. S W. & THERMO S TAT BL ...
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Bunn CWTF TWIN - page 29
Page 29 P4-2 P4-3 SCHEMATIC WIRING DIAGRAM CWT TWIN 2/2 & 4/2 W/RECOVERY BOOSTER L1 GREEN N L2 RED WHI WHI WHI LEFT TOP WARMER RIGHT TOP WARMER ...
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Bunn CWTF TWIN - page 30
Page 30 GRY PIN L.E.D. L.E.D. GRY PIN GRY PIN OPTIONAL INDICATOR TIMER WHI/RED WHI/GRN P1-2 P1-3 SCHEMATIC WIRING DIAGRAM CWTF TWIN 0/6 L1 GREEN (FAUCET) BLK BLK RIGHT TANK HEATER BLK BLU BLK BLK S W2 RT. LIMIT THERMO S TAT RT. READY INDICATOR RT. S W. & THERMO S TAT BLK RED LEFT BREW WARMER RIGHT BREW WARMER WHI P1-1 WHI/RED WHI/GRN WHI WHI RE ...
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Bunn CWTF TWIN - page 31
Page 31 BLK WHI RED BLU TANK HEATER BLK LIMIT THERMO S TAT LIMIT THERMO S TAT S W1-L S W1-R (FAUCET S IDE) "KEEP WARM" HEATER SCHEMATIC WIRING DIAGRAM CWTF TWIN 4/2 & 0/6 TWO-CIRCUIT GREEN GREEN L2 N L1 LEFT L2 N L1 RIGHT 10 8 47.0000C 12/00 © 1994 BUNN-O-MATIC CORPORATION TWO INDIVIDUAL BRANCH CIRCUITS RE Q UIRED EACH RATED 120/240 ...
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Bunn CWTF TWIN - page 32
Page 32 WHI/RED WHI/GRN P1-2 P1-3 SCHEMATIC WIRING DIAGRAM CWTF TWIN 0/6 WITH RECOVERY BOOSTER L1 GREEN (FAUCET) THERMAL S AFETY FU S E BLK BLK RIGHT TANK HEATER BLK BLU BLK BLK S W2 RT. LIMIT THERMO S TAT RT. READY INDICATOR RT. S W. & THERMO S TAT BLK RED LEFT BREW WARMER RIGHT BREW WARMER WHI P1-1 WHI/RED WHI/GRN WHI WHI RED S W3 S W4 BLK RI ...
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Bunn CWTF TWIN - page 33
Page 33 WHI/RED WHI/GRN P1-2 P1-3 P4-2 P4-3 SCHEMA TIC WIRING DIAGRAM CWTF A TWIN 2/2, 4/2 & TWIN-APS L1 GRN/YEL L2 L3 RIGHT T ANK HEATER BLK BLU RT . READY INDICA TOR RT . SW . & THERMOST A T RED BLK SW2 BLU RT . LIMIT THERMOST AT BLU 10736.0001G 02/06 © 1993 BUNN-O-MA TIC CORPORA TION 230 VOL TS AC 3 WIRE THREE PHASE RED RED RED MODEL 4/ ...
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Bunn CWTF TWIN - page 34
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 L1 GRN/YEL L2 (FAUCET) THERMAL FUSE BLK RIGHT TANK HEATER BLK RED BLU BLK BLK SW2 RT. LIMIT THERMOSTAT RT. READY INDICATOR RT. SW. & THERMOSTAT ...
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Bunn CWTF TWIN - page 35
Page 35 BLK WHI/RED WHI/GRN P1-2 P1-3 P4-2 P4-3 SCHEMA TIC WIRING DIA GRAM CWTF A 2/2 TWIN, CWTF A 4/2 TWIN & CWTF A TWIN-APS L1 L2 10736.0004A 02/06 © 2006 BUNN-O-MA TIC CORPORA TION 230 VOL TS AC 2 WIRE SINGLE PHASE RED RED RED MODEL 4/2 ONL Y NOT APPLICABLE TO APS MODELS NOT APPLICABLE TO APS MODELS BLK SW9 LEFT TOP REAR WARMER P5-2 P5-3 SW ...
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