Page 3 - Contents
Page 3 41711.1 052009 Contents Trouble Shooting .............................................................................................................. 4 Component Access ........................................................................................................ 10 Control Thermo...
Page 4 - TROUBLESHOOTING; PROBLEM
Page 4 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 ...
Page 10 - SERVICE; CONTROL THERMOSTAT
Page 10 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.WARNING - Inspection, testing, and repair of electri- cal equipment...
Page 13 - CT SERIES
Page 13 SERVICE (cont.) START SWITCHES Location: CRT/CRTF On brewers w/out fresh light, the start switch is located in the right front of the hood. On brewers w/fresh light, the start switch is located on the right side of the hood. Location: CT/CWT/CWTF/TWINS On most "CT" series brewers, th...
Page 14 - SOLENOID VALVES
Page 14 SERVICE (cont.) SOLENOID VALVES Location: The solenoid valve is located inside the trunk on the lower center part of the component bracket. Test Procedures: 1. Disconnect the brewer from the power source. 2. Disconnect the white and black wires from the solenoid valve. With the "ON/OFF...
Page 15 - THE BASE WITH LOCKING PLIERS AS THIS CAN
Page 15 41711.1 052009 120VAC - 1.18K 240VAC - 3.76K 120VAC - 247 240VAC - 757 120VAC - 334 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...
Page 17 - HEATER RESISTANCE; NOTE
Page 17 1800W-120V 7.40 - 8.70 1850W-220V 24.40 -28.40 3500W-200V 10.70 -12.36 3500W-240V 15.36 -17.90 HEATER RESISTANCE If resistance is present as described, reconnect the wires, the tank heater is ok. If resistance is not present as described, replace the tank heater. NOTE - If any resistance is ...
Page 22 - LIMIT THERMOSTAT
Page 22 SERVICE (cont.) 41711.1 052009 LIMIT THERMOSTAT Location: The limit thermostat is located inside the rear of the hood on the tank lid. Test Procedures: 1. Disconnect the brewer from the power source. 2. Disconnect the blue and black wires from the limit thermostat. 3. Check for continuity ac...
Page 23 - Diagrams and check the brewer wiring harness.
Page 23 RECOVERY BOOSTER RELAY (OPTIONAL) FIG. 23-1 RECOVERY BOOSTER RELAY Location The recovery booster(s) are located inside the trunk on the center of the component brackets just above the solenoid valve. The coil is activated by the timer/ solenoid circuit. The contacts then close, bypassing the...
Page 26 - NOTE: Do not remove or install wires while timer board; ing Diagrams and check the wiring harness.
Page 26 DIGITAL BREW TIMER (Late Models) FIG. 26-1 DIGITAL BREW TIMER SERVICE (cont.) Location: The timer is located inside the front of the trunk on the upper right side of component bracket. Test Procedure NOTE: Do not remove or install wires while timer board is installed. Pressure applied to one...
Page 28 - WARMER RESISTANCE
Page 28 WARMER ELEMENT(S) Location: The warmer element(s) is located under the warmer plate. Test Procedures: 1. Disconnect the brewer from the power source. 2. With a voltmeter, check voltage across the two wires at the warmer element with the "ON/OFF" switch in the "ON" position. C...
Page 29 - SCHEMATIC WIRING DIAGRAM; Black Ink
Page 29 L1 BLK WHI BLK BLK BLK BLK BLK VIO BRN/BLK YEL WHI/VIO LEFT FRONT WARMER LEFT REAR WARMER RIGHT FRONT WARMER RIGHT REAR WARMER BLK BLK TANK HEATER WHI (MODEL 20) N L2 RED (MODEL 35) GREEN WHI WHI WHI WHI WHI WHI WHI WHI WHI WHI WHI/GRN WHI/BLU LOWER CENTER WARMER BLU WHI/RED WHI/RED WHI/RED ...
Page 34 - SCHEMATIC WIRING DIAGRAM FOR CWT-APS MV,
Page 34 SCHEMATIC WIRING DIAGRAM FOR CWT-APS MV, CWTF-APS MV, CWTF-TS MV, CWTF-TSR MV 41711.1 052009
Page 42 - SCHEMATIC WIRING DIAGRAM CWTFA; THREE PHASE
Page 42 WHI/RED WHI/GRN P1-2 P1-3 P4-2 P4-3 SCHEMATIC WIRING DIAGRAM CWTFA TWIN 2/2 & 4/2 L1 GRN/YEL L2 L3 RIGHT TANK HEATER BLK BLU RT. READY INDICATOR RT. SW. & THERMOSTAT RED BLK SW2 BLU RT. LIMIT THERMOSTAT BLU 10736.0001G 12/00 © 1993 BUNN-O-MATIC CORPORATION 230 VOLTS AC 3 WIRE THREE P...
Page 44 - SCHEMATIC WIRING DIAGRAM
Page 44 BLK WHI/RED WHI/GRN P1-2 P1-3 P4-2 P4-3 SCHEMATIC WIRING DIAGRAM CWTFA 2/2 TWIN, CWTFA 4/2 TWIN & CWTFA TWIN-APS L1 L2 10736.0004A 02/06 © 2006 BUNN-O-MATIC CORPORATION 230 VOLTS AC 2 WIRE SINGLE PHASE RED RED RED MODEL 4/2 ONLY NOT APPLICABLE TO APS MODELS NOT APPLICABLE TO APS MODELS B...
Page 46 - SCHEMATIC WIRING DIAGRAM CWTF TWIN 0/6
Page 46 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 (FAUCET) BLK BLK RIGHT TANK HEATER BLK BLU BLK BLK SW2 RT. LIMIT THERMOSTAT RT. READY INDICATOR RT. SW. & THERMOSTAT BLK RED LEFT BREW WARMER RIGHT BREW WARMER ...
Page 48 - SCHEMATIC WIRING DIAGRAM CWTB
Page 48 P3 P1, P2, & P3 ARE PINS OF A POLARIZED THREE-PIN CONNECTOR. BLU P1 RED OPTIONAL AUTOMATIC BREW CIRCUIT SCHEMATIC WIRING DIAGRAM CWTB 10836.0002E 07/00 ©1995 BUNN-O-MATIC CORPORATION P2 P1 FRONT RED RED P3 RED BRN/BLK VIO RED REAR RED RED RED BLK WHI/RED LOWER WARMER START SWITCH WHI/RED...
Page 49 - SCHEMATIC WIRING DIAGRAM CWTA; WIRE
Page 49 P3 P1, P2, & P3 ARE PINS OF A POLARIZED THREE-PIN CONNECTOR. BLU P1 RED OPTIONAL AUTOMATIC BREW CIRCUIT SCHEMATIC WIRING DIAGRAM CWTA 10836.0003E 07/00 ©1995 BUNN-O-MATIC CORPORATION P2 P1 FRONT RED RED P3 RED BRN/BLK VIO RED REAR RED WHI RED RED BLK WHI/RED LOWER WARMER START SWITCH WHI...
Page 50 - SCHEMATIC WIRING DIAGRAM CWTA - CE
Page 50 P1, P2, & P3 ARE PINS OF A POLARIZED THREE-PIN CONNECTOR. SOL BREW TIMER RED RED 10836.0004H 10/02 ©1997 BUNN-O-MATIC CORPORATION P2 P1 FRONT WARMER RED RED P3 RED BRN/BLK VIO RED REAR WARMER RED RED WHI/RED WHI/RED LOWER WARMER REAR WARMER RED RED P3 P1 VIO 230 VOLTS AC 2 WIRE SINGLE PH...
Page 57 - TWO INDIVIDUAL BRANCH
Page 57 BLK WHI RED BLU TANK HEATER BLK LIMIT THERMOSTAT LIMIT THERMOSTAT SW1-L SW1-R (FAUCET SIDE) "KEEP WARM" HEATER SCHEMATIC WIRING DIAGRAM CWTF TWIN 4/2 & 0/6 TWO-CIRCUIT LEFT RIGHT 10847.0000D 01/07 ©1994 BUNN-O-MATIC CORPORATION TWO INDIVIDUAL BRANCH CIRCUITS REQUIRED EACH RATED 1...
Page 59 - SINGLE PHASE
Page 59 WHI/RED WHI/GRN P1-2 P1-3 SCHEMATIC WIRING DIAGRAM CWTF TWIN 0/6 WITH RECOVERY BOOSTER L1 GREEN (FAUCET) THERMAL SAFETY FUSE BLK BLK RIGHT TANK HEATER BLK BLU BLK BLK SW2 RT. LIMIT THERMOSTAT RT. READY INDICATOR RT. SW. & THERMOSTAT BLK RED LEFT BREW WARMER RIGHT BREW WARMER WHI P1-1 WHI...