Bunn C Series Service & Repair Manual
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Bunn C Series Service & Repair Manual

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C, CS, CT, CWTF,
CRT, CRTF Series
Including
DV, MV, APS/TC/TS,
Single CW & Twins
Supercedes Service Manual: 41711.0000
SERVICE & REPAIR MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601
FAX: (217) 529-6644
41711.0001B 05/12 ©2009 Bunn-O-Matic Corporation

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  • Page 1 C, CS, CT, CWTF, CRT, CRTF Series Including DV, MV, APS/TC/TS, Single CW & Twins Supercedes Service Manual: 41711.0000 SERVICE & REPAIR MANUAL BUNN-O-MATIC CORPORATION POST OFFICE BOX 3227 SPRINGFIELD, ILLINOIS 62708-3227 PHONE: (217) 529-6601 FAX: (217) 529-6644 41711.0001B 05/12 ©2009 Bunn-O-Matic Corporation...
  • Page 2 AS SPECIFIED HEREIN, TO REPAIR, 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 3: Table Of Contents

    Contents Trouble Shooting ......................4 Component Access ......................10 Control Thermostat ......................10 Electronic Thermostat ....................11 ON/OFF Switch ....................... 12 Start Switch (Brew) ......................13 Solenoid (Inlet) ......................14 Tank Heater ........................16 Fill Basin ........................16 Tank Heater Switch ......................18 Thermal Cut-Off ......................

  • Page 4: Troubleshooting

    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 Service Department. • Inspection, testing, and repair of electrical equipment should be performed only by qualified service person- nel.

  • Page 5: Control Thermostat

    TROUBLESHOOTING (cont.) PROBABLE CAUSE REMEDY PROBLEM Brew cycle will not start (cont.) 3. ON/OFF Switch Refer to Service - ON/OFF Switch for testing. 4. Start Switch Refer to Service - Start Switch for testing procedures. 5. Timer Refer to Service - Timer for test- ing procedures.
  • Page 6 TROUBLESHOOTING (cont.) PROBLEM REMEDY PROBABLE CAUSE 1. Strainer /flow control (.222 Inconsistent beverage level in (A) Direction of flow arrow must GPM) Early models. dispenser be pointing towards the brewer. (B) Remove the strainer/flow control and check for obstruc- tion. Clear or replace. 2.
  • Page 7 TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY Spitting or excessive steaming 2. Control Thermostat Refer to Service - Control Ther- (cont.) mostat for testing procedures. Dripping from sprayhead 1. Syphon System The brewer must be level or slightly lower in front to syphon properly.

  • Page 8: Solenoid (Inlet)

    TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY 1. Filter Type Weak beverage BUNN® paper filters must be used for proper extraction. 2. Coffee Grind A fine or drip grind must be used for proper extraction. 3. Sprayhead A six-hole stainless steel spray- head must be used for proper extraction.
  • Page 9 TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY 4. Tank Heater Brewer is making unusal noises Remove and clean lime off the tank heater. (cont.) 1. Warmer Refer to Service - Warmer ele- Low beverage serving tempera- ture ment for testing procedures. 2.
  • Page 10 SERVICE This section provides procedures for testing and 3. Gently remove the capillary bulb and grommet replacing various major components used in this from the tank. brewer should service become necessary. Refer to 4. Check for continuity across the thermostat termi- Troubleshooting for assistance in determining the nals.
  • Page 11 SERVICE (cont.) OPTIONAL ELECTRONIC THERMOSTAT (ERT): The ERT is located inside the trunk on the upper left side of the component bracket. Test Procedures: 1. Disconnect the brewer from the power source. 2. Gently remove the temperature sensor and grom- met from the tank.
  • Page 12 SERVICE (cont.) ON/OFF WARMER SWITCH Removal and Replacement: 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 spread the clips to hold switch in the hood.
  • Page 13 SERVICE (cont.) START SWITCHES Test Procedure: CT SERIES 1. Disconnect the brewer from the power supply. 2. Disconnect the blue wire and the white/red wire from the switch terminals. 3. Check for continuity across the two terminals on the switch when it is held in the "pressed-in" posi- tion.
  • Page 14 SERVICE (cont.) SOLENOID VALVES 6. Check the solenoid valve for coil action. Connect the brewer to the power source. With "ON/OFF" switch in the "ON' upper position press start switch and listen carefully in the vicinity of the solenoid valve for a" clicking" sound as the coil magnet attracts.
  • Page 15 SERVICE (cont.) SOLENOID VALVES Disassembly: 1. Use of the basin wrench 01060.0000 is recom- mended for disassembly of early style valves as illustrated below. 2. Disconnect from power source and turn off the water supply to the brewer. 3. Disconnect the water lines to and from the solenoid valve.

  • Page 16: Tank Heater

    SERVICE (cont.) FILL BASIN TANK HEATER FIG. 16-1 TANK HEATER FIG. 16-2 TANK HEATER Location: The tank heater is located inside the tank and Disassembly: secured to the tank lid. 1. Use of the basin wrench 01060.0000 is recom- mended for removal of the fill basin. Test Procedures: 2.
  • Page 17 SERVICE (cont.) TANK HEATER (Cont.) HEATER RESISTANCE 11. Install tank lid with limit thermostat, sprayhead 1800W-120V 7.40 - 8.70 tube, tank heater, coil assembly (brewers with 1850W-220V 24.40 -28.40 faucet) and control thermostat with bracket (early brewers only) using eight #8-32 hex nut. 3500W-200V 10.70 -12.36...

  • Page 18: Tank Heater Switch

    SERVICE (cont.) TANK HEATER SWITCH 5. With the tank heater switch in the "ON" upper posi- tion, check for continuity between the black wire removed from the limit thermostat and the black insert on the terminal block. Continuity should not be present in the "OFF" lower position. If continuity is present as described, the tank heater switch is operating properly.
  • Page 19 SERVICE (cont.) TANK HEATER SWITCH (cont.) 15. Set tank assembly inside the hood on mounting brackets and secure with two #8-32 screws. 16. Reconnect the wires to the limit thermostat, tank heater and the control thermostat. Refer to limit thermostat, tank heater and control thermostat sec- tions in this manual when reconnecting wires.

  • Page 20: Thermal Cut-Off

    SERVICE (cont.) Removal and Replacement: THERMAL CUT-OFF (Brewers W/Faucet) 1. Disconnect both ends of the TCO. 2. Install new thermal cut-off. 3. Refer to Fig. 17 when reconnecting wires. Thermal Cut-Off from Tank Heater to BLK Lead from Control Thermostat WHI or RED to Terminal Block Fig.

  • Page 21: Coil/Faucet

    SERVICE (cont.) COIL/FAUCET Location: The coil for the faucet is located in the tank. Operation: Water inside the coil is separate from the brewing water and is always under line pressure. Brewing water in the tank heats the submerged coil. Use of a coil faucet during a brew cycle will not cause short potting, but is limited to 8-10 ounces of hot water before the cooler water is passed through coil.

  • Page 22: Limit Thermostat

    SERVICE (cont.) LIMIT THERMOSTAT If continuity is present as described, the limit thermostat is operating properly. If continuity is not present as described, replace the limit thermostat. Removal and Replacement: 1. Remove all wires from limit thermostat termi- nals. 2. Carefully slide the limit thermostat out from under the retaining clip and remove limit thermostat.

  • Page 23: Recovery Booster

    contact terminals. Connect the brewer to the power RECOVERY BOOSTER RELAY (OPTIONAL) source. With the "ON/OFF" switch in the "ON" po- sition and the start switch pressed and released, 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.

  • Page 24: Timer (Early Model)

    SERVICE (cont.) Connect the brewer to the power source. The TIMER (Early Models) indication must be: a) 120 volts ac for two wire 120 volt models and three wire 120/240 volt models. b) 200 to 240 volts ac for two wire 200 volt or 240 volt models.

  • Page 25: Freshness Timer (Early Models)

    SERVICE (cont.) If voltage is present as described, proceed to #4. FRESHNESS TIMER (Early Models) If voltage is not present as described, refer to the Wiring Diagrams and check the brewer wiring har- ness. 4. Check the voltage across the T3 and T4 (white/ orange and white/blue wires) of the fresh timer with a voltmeter when the "ON/OFF"...

  • Page 26: Digital Brew Timer (Late Model)

    SERVICE (cont.) DIGITAL BREW TIMER (Late Models) 4. With a voltmeter, check the output voltage across terminals TL2 and TL4 when the "ON/OFF" switch is in the "ON" position. Connect the brewer to the power source and press the "START" switch. The indication must be as follows: a) 120 volts ac for two wire 120 volt models and three wire 120/240 volt models.
  • Page 27 SERVICE (cont.) DIGITAL BREW TIMER (Late Models)(cont.) NOTE: Several ounces of water will continue to sy- Timer Setting: phon from the tank after turning the switch “OFF”. NOTE: Prior to setting or modifying volumes, check The brewer remembers this volume and will continue that the brewer is connected to water supply, the to brew batches of this size until the volume setting tank is properly filled, and a funnel and server are in...

  • Page 28: Warmer Elements

    SERVICE (cont.) WARMER ELEMENT(S) 4. Check the resistance across the two terminals on the warmer element. NOTE: There should be no resistance reading between the heater sheath and either terminal. Refer to the following chart. If resistance is to specification, reconnect the two wires to the warmer element.
  • Page 29 LEFT REAR ON/OFF SWITCH WARMER BRN/BLK RIGHT FRONT WARMER ON/OFF SWITCH RIGHT REAR WARMER 120/240 VOLTS AC 3 WIRE 120 VOLTS AC 2 WIRE SINGLE PHASE 10476.0000G 07/03 © 1990 BUNN-O-MATIC CORPORATION White Strip-Tac Plus 41711.1 052009 Page 29 Black Ink...

  • Page 30: Schematic Wiring Diagram

    TIMER ON/OFF SWITCH LEFT FRONT WARMER ON/OFF SWITCH WHI/VIO LEFT REAR ON/OFF SWITCH WARMER BRN/BLK RIGHT FRONT WARMER ON/OFF SWITCH RIGHT REAR WARMER 240 VOLTS AC 2 WIRE SINGLE PHASE 10477.0000H 07/03 © 1990 BUNN-O-MATIC CORPORATION 41711.1 052009 Page 30...
  • Page 31 TIMER ON/OFF SWITCH LEFT FRONT WARMER ON/OFF SWITCH WHI/VIO LEFT REAR WARMER ON/OFF SWITCH BRN/BLK RIGHT FRONT WARMER ON/OFF SWITCH RIGHT REAR WARMER 200 VOLTS AC 2 WIRE SINGLE PHASE 10477.0001H 07/03 © 1993 BUNN-O-MATIC CORPORATION 41711.1 052009 Page 31...
  • Page 32 WHI Model 15 "KEEP WARM" HEATER OPTIONAL AUTOMATIC BREW CIRCUIT ON/OFF SWITCH START SWITCH WHI/BLU WHI/RED WHI/RED WHI/GRN BREW TIMER 120/240 VOLTS AC 3 WIRE 120 VOLTS AC 2 WIRE SINGLE PHASE 10693.0000G 02/07 © 1993 BUNN-O-MATIC CORPORATION 41711.1 052009 Page 32...
  • Page 33 SWITCH START SWITCH WHI/RED WHI/RED P1, P2, & P3 ARE PINS OF A BREW POLARIZED THREE-PIN TIMER CONNECTOR. 120/240 VOLTS AC 3 WIRE 120 VOLTS AC 2 WIRE 10693.0001C 9/96 © 1996 BUNN-O-MATIC CORPORATION SINGLE PHASE 41711.1 052009 Page 33...
  • Page 34 SCHEMATIC WIRING DIAGRAM FOR CWT-APS MV, CWTF-APS MV, CWTF-TS MV, CWTF-TSR MV 41711.1 052009 Page 34...
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  • Page 39 41711.1 052009 Page 39...
  • Page 40 RIGHT TOP FRONT WARMER MODEL 4/2 ONLY P5-3 P5-1 WHI/VIO WHI/VIO LEFT TOP REAR WARMER SW10 P5-2 WHI/BRN WHI/BRN RIGHT TOP REAR WARMER 120/240 VOLTS AC 3 WIRE + GND SINGLE PHASE 10736.0000L 03/07 © 1993 BUNN-O-MATIC CORPORATION 41711.1 052009 Page 40...
  • Page 41 RIGHT TOP FRONT WARMER MODEL 4/2 ONLY P5-3 P5-1 WHI/VIO WHI/VIO LEFT TOP REAR WARMER SW10 P5-2 WHI/BRN WHI/BRN RIGHT TOP REAR WARMER 120/240 VOLTS AC 3 WIRE + GND SINGLE PHASE 10736.0000M 01/10 © 1993 BUNN-O-MATIC CORPORATION 41711.1 020410 Page 41...
  • Page 42 RIGHT TOP FRONT WARMER MODEL 4/2 ONLY P5-3 P5-1 WHI/VIO WHI/VIO LEFT TOP REAR WARMER SW10 P5-2 WHI/BRN WHI/BRN RIGHT TOP REAR WARMER 230 VOLTS AC 3 WIRE THREE PHASE 10736.0001G 12/00 © 1993 BUNN-O-MATIC CORPORATION 41711.1 052009 Page 42...
  • Page 43 RIGHT TOP FRONT WARMER MODEL 4/2 ONLY P5-3 P5-1 WHI/VIO WHI/VIO LEFT TOP REAR WARMER SW10 P5-2 WHI/BRN WHI/BRN RIGHT TOP REAR WARMER 200 OR 240 VOLTS AC 2 WIRE SINGLE PHASE 10736.0002J 12/00 © 1993 BUNN-O-MATIC CORPORATION 41711.1 052009 Page 43...
  • Page 44 RIGHT TOP FRONT WARMER MODEL 4/2 ONLY P5-3 P5-1 WHI/VIO WHI/VIO LEFT TOP REAR WARMER SW10 P5-2 WHI/BRN WHI/BRN RIGHT TOP REAR WARMER 230 VOLTS AC 2 WIRE SINGLE PHASE 10736.0004A 02/06 © 2006 BUNN-O-MATIC CORPORATION 41711.1 052009 Page 44...
  • Page 45 WHI/RED WHI/GRN T1 T5 T3 T4 LEFT BREW TIMER WHI/RED WHI/RED WHI/BLU WHI/RED WHI/GRN T1 T5 T3 T4 RIGHT BREW TIMER 230 VOLTS AC 2 WIRE + GND SINGLE PHASE 10736.0005B 08/07 © 2007 BUNN-O-MATIC CORPORATION 41711.1 052009 Page 45...
  • Page 46 P4-2 BRN/BLK BRN/BLK RIGHT FRONT WARMER LEFT FRONT WARMER SW12 SW10 P5-2 P4-3 WHI/VIO WHI/VIO LEFT REAR WARMER RIGHT REAR WARMER 120/240 VOLTS AC 3 WIRE + GND SINGLE PHASE 10741.0000H 01/07 © 1993 BUNN-O-MATIC CORPORATION 41711.1 052009 Page 46...
  • Page 47 CONNECTOR. TIMER OPTIONAL DUAL WARMER ASSY (TOP OR SIDE) BRN/BLK BRN/BLK FRONT REAR OPTIONAL SINGLE TOP WARMER ASSY 120/240 VOLTS AC 3 WIRE 120 VOLTS AC 2 WIRE SINGLE PHASE REAR 10836.0000H 05/09 ©1995 BUNN-O-MATIC CORPORATION 41711.1 052009 Page 47...
  • Page 48 T1 T5 T3 WHI/GRN POLARIZED THREE-PIN BREW CONNECTOR. TIMER OPTIONAL DUAL WARMER ASSY (TOP OR SIDE) BRN/BLK BRN/BLK FRONT REAR OPTIONAL SINGLE TOP WARMER ASSY 200 VOLTS AC 2 WIRE SINGLE PHASE REAR 10836.0002E 07/00 ©1995 BUNN-O-MATIC CORPORATION 41711.1 052009 Page 48...
  • Page 49 T1 T5 T3 WHI/GRN POLARIZED THREE-PIN BREW TIMER CONNECTOR. OPTIONAL DUAL WARMER ASSY (TOP OR SIDE) BRN/BLK BRN/BLK FRONT REAR OPTIONAL SINGLE TOP WARMER ASSY 220-240 VOLTS AC 2 WIRE SINGLE PHASE REAR 10836.0003E 07/00 ©1995 BUNN-O-MATIC CORPORATION 41711.1 052009 Page 49...
  • Page 50 CONNECTOR. OPTIONAL DUAL WARMER ASSY (TOP OR SIDE) BRN/BLK BRN/BLK GRINDER FRONT WARMER INTERFACE CONNECTOR REAR WARMER OPTIONAL SINGLE TOP WARMER ASSY 230 VOLTS AC 2 WIRE SINGLE PHASE REAR WARMER 10836.0004H 10/02 ©1997 BUNN-O-MATIC CORPORATION 41711.1 052009 Page 50...
  • Page 51 T5 T3 41711.1 052009 Page 51...
  • Page 52 START SWITCH WHI/RED L.E.D. INDICATOR TIMER WHI/RED P1, P2, & P3 ARE PINS OF A BREW POLARIZED THREE-PIN TIMER CONNECTOR. 120/240 VOLTS AC 3 WIRE 100-120 VOLTS AC 2 WIRE SINGLE PHASE 10836.0006M 02/07 ©1995 BUNN-O-MATIC CORPORATION 41711.1 052009 Page 52...
  • Page 53 OPTIONAL FRESH LIGHT SYSTEM START SWITCH WHI/RED L.E.D. INDICATOR WHI/RED TIMER P1, P2, & P3 ARE PINS OF A P2 WHI BREW POLARIZED THREE-PIN TIMER CONNECTOR. 230 VOLTS AC 2 WIRE SINGLE PHASE 10836.0008A 12/99 ©1999 BUNN-O-MATIC CORPORATION 41711.1 052009 Page 53...
  • Page 54 OPTIONAL DUAL WARMER ASSY (TOP OR SIDE) BRN/BLK BRN/BLK FRONT WARMER REAR WARMER OPTIONAL SINGLE TOP WARMER ASSY 120V AC 2 WIRE 120/208V AC 3 WIRE 120/240V AC 3 WIRE SINGLE PHASE REAR WARMER 10836.0009C 02/07 ©2003 BUNN-O-MATIC CORPORATION 41711.1 052009 Page 54...

  • Page 55: Schematic Wiring Diagrams

    RED-14 ON/OFF "KEEP WARM" HEATER SWITCH START SWITCH WHI/RED WHI/RED WHI/BLU WHI/RED 120V AC 2 WIRE WHI/GRN T5 T3 120/208V AC 3 WIRE BREW 120/240V AC 3 WIRE TIMER SINGLE PHASE 10836.0010B 02/07 ©2001 BUNN-O-MATIC CORPORATION 41711.1 052009 Page 55...
  • Page 56 TIMER HALF/FULL SWITCH P1, P2, & BRN/BLK P3 ARE PINS OF A POLARIZED THREE-PIN CONNECTOR. 120/240 VOLTS AC 3 WIRE 120 VOLTS AC 2 WIRE SINGLE PHASE NO CONNECTION THIS APPLICATION 10836.0011B 01/03 ©2003 BUNN-O-MATIC CORPORATION 41711.1 052009 Page 56...
  • Page 57 LEFT FRONT WARMER RIGHT FRONT WARMER SW5-L SW5-R P2-3L P2-3R RIGHT REAR WARMER LEFT REAR WARMER TWO INDIVIDUAL BRANCH CIRCUITS REQUIRED EACH RATED 120/240 VOLTS AC 3 WIRE + GND SINGLE PHASE 10847.0000D 01/07 ©1994 BUNN-O-MATIC CORPORATION 41711.1 052009 Page 57...
  • Page 58 WHI/YEL RIGHT TOP WARMER MODELS 4/2 ONLY P5-3 P5-1 WHI/VIO WHI/VIO LEFT TOP WARMER SW10 P5-2 WHI/BRN WHI/BRN RIGHT TOP WARMER 120/240 VOLTS AC 3 WIRE + GND SINGLE PHASE 10867.0000F 01/07 © 1995 BUNN-O-MATIC CORPORATION 41711.1 052009 Page 58...
  • Page 59 P5-1 P4-1 P4-2 BRN/BLK BRN/BLK RIGHT FRONT WARMER LEFT FRONT WARMER SW10 SW12 P5-3 P4-3 WHI/VIO WHI/VIO RIGHT REAR WARMER LEFT REAR WARMER 120/240 VOLTS AC 3 WIRE SINGLE PHASE 27693.0000D 07/03 © 1996 BUNN-O-MATIC CORPORATION 41711.1 052009 Page 59...

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Cs seriesCrt seriesCrtf seriesCt seriesSeries cwtf

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