BUNN ® SRUA OPERATING & SERVICE MANUAL BUNN-O-MATIC CORPORATION POST OFFICE BOX 3227 SPRINGFIELD, ILLINOIS 62708-3227 PHONE: (217) 529-6601 FAX: (217) 529-6644 10067.0003A 07/02 ©2002 Bunn-O-Matic Corporation www.bunnomatic.
INTRODUCTION This brewer will brew a three gallon batch of coffee into the reservoir, which has its own dispensing faucet.The brewer also has a hot water faucet for allied beverage use. It is only for indoor use on a sturdy counter. BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY Bunn-O-Matic Corp. (“BUNN”) warrants equipment manufactured by it as follows: 1) All equipment other than as specified below: 2 years parts and 1 year labor. 2) Electronic circuit and/or control boards: parts and labor for 3 years.
USER NOTICES Carefully read and follow all notices on the brewer and in this manual. They were written for your protection. All notices on the brewer are to be kept in good condition. Replace any unreadable or damaged labels. #00656.0000 #00831.0000 ATTENTION: TURN OFF WHEN UNATTENDED #10044.0000 #00878.0000 #03408.0000 #12593.0000 #03409.0000 #12555.0000 #29299.0000 Page 3 10067.
ELECTRICAL REQUIREMENTS CAUTION - The brewer must be disconnected from the power source until specified in Initial Set-Up. L2 RED 230V A.C. L1 BLACK P1842 SRUA Models require 2-wire, grounded service rated 230 volts ac, 30 amp, single phase, 50 Hz. Proceed as follows: ELECTRICAL INSTALLATION INSTRUCTIONS CAUTION – Improper electrical installation can damage the equipment and injure the installer. The chassis must be properly grounded. Do not assume a plumbing line will provide an adequate ground. 1.
PLUMBING REQUIREMENTS(cont.) Plumbing Hook-up 1. Make certain the 3/8" female flare fittings on the short tube from the outlet of strainer (supplied) is securely attached to the male fitting at the bottom rear of the brewer. 2. Flush the water line and securely attach it to the 3/8" male flare fitting on the inlet of the strainer. 3. Turn on the water supply. 4. Inspect the connection for leaks.
ADJUSTING BREW VOLUMES CAUTION - Disconnect the power source from the brewer prior to the removal of any panel for the replacement or adjustment of any component. NOTE: Prior to setting or modifying batch sizes, check that the brewer is connected to water supply, the tank is properly filled, and a funnel support, funnel and funnel cover are in place. 1. Modifying batch sizes. To modify a batch volume, first check that the SET/LOCK switch is in the “SET” position on the circuit board.
COFFEE BREWING 1. Brew cycles may be started whenever water temperature is correct. This condition is indicated by the dial thermometer on front of the brewer. Whenever the pointer is in the green, brewer is ready for brewing. 2. Insert a Bunn® filter in funnel and add desired amount of coffee. 3. Level the bed of coffee and place funnel into the funnel support. Place funnel cover over the funnel and be sure the water swing spout is over the center of the funnel cover. 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 electrical equipment should be performed only by qualified service personnel. All electronic components have 230 volt ac and low voltage dc potential on their terminals.
TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY Brew cycle will not start (cont.) 6. Start Switch Refer to Service - Start Switch for testing procedures. See page 24 7. Timer Refer to Service - Timer for testing procedures. See page 28 or 29 8. Pump Refer to Service - Pump for testing procedures. See page 21 9. Solenoid Valve Refer to Service - Solenoid Valve for testing procedures. See page 23 10. Strainer (A) Direction of flow arrow must be pointing towards brewer.
TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY Water running out of the overflow 1. Brewer not level Brewer must be level and installed on a sturdy structure. 2. Solenoid Valve Refer to Service - Solenoid Valve for testing procedures. See page 23 3. Liquid Level Board Refer to Service -Liquid Level Board for testing procedures. See page 18 4. Probe Refer to Service - Probe for testing procedures. See page 18 1. Limit Thermostat CAUTION - Do not eliminate or bypass limit thermostat.
TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY Water keeps running from swing spout 1. Timer Refer to Service - Timer for testing procedures. See page 28 or 29 2. Start Switch Refer to Service - Start Switch for testing procedures. See page 24 1. Timer Refer to Service - Timer for testing procedures. See page 28 or 29 2. Solenoid Valve Refer to Service - Solenoid Valve for testing procedures. See page 23 3. Lime build-up in swing spout and pump tubing.
TROUBLESHOOTING (cont.) PROBLEM Coffee reservoir overflows PROBABLE CAUSE 1. Coffee reservoir not completely empty before a brew cycle was started. Refer to Service -Timer for testing procedures. See page 28 or 29 2. Timer 3. Pump - Flow Rate Brewer is making unusal noises REMEDY Be sure coffee reservoir is empty before brew cycle is started. Check pump flow rate with a watch. Pump flow rate should be approximately 24 ounces in 15 seconds. Be sure pump assembly is free of any obstructions. 1.
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 electrical equipment should be performed only by qualified service personnel. The brewer should be unplugged when servicing, except when electrical tests are required and the test procedure specifically states to plug in the brewer.
If voltage is present as described, proceed to #9. If voltage is not present as described, refer to the wiring diagram and check the brewer wiring harness. SERVICE (cont.) CONTACTOR 9. Check for continuity across the terminals on the left side of the contactor by manually closing the contacts. Continuity must not be present when the contact is released. 10. Check for continuity across the terminals on the right side of the contactor by manually closing the contacts.
SERVICE (cont.) CONTROL THERMOSTAT FIG. 4 CONTROL THERMOSTAT P2180 Location: The control thermostat is mounted on the left front of the top component bracket. Test Procedures: 1. Disconnect the brewer from the power source. 2. Locate the thermostat and check for 230 volts ac between the red wire from the limit thermostat to the control thermostat and the black wire on the main terminal block. 3. Disconnect the brewer from the power source. If voltage is present as described, proceed to #4.
SERVICE (cont.) FUSE AND FUSE HOLDER Fuse Holder: 1. Disconnect the wires from the rear of the fuse holder. 2. Remove the nut securing the fuse holder to the component bracket. 3. Push fuse holder through the hole in the component bracket. 4. Install new fuse holder and fuse through the hole in the component bracket and secure with nut. 5. Refer to Fig. 7 and reconnect the wires. RED from ON/OFF Switch P2176.30 FIG.
SERVICE (cont.) LIMIT THERMOSTAT RED to Main Harness RED to Control Thermostat P1984 FIG. 8 LIMIT THERMOSTAT P2180 FIG. 9 LIMIT THERMOSTAT TERMINALS Location: The limit thermostat is located on the center rear of the component bracket behind the tank heater. Test Procedures: 1. Disconnect the brewer from the power source. 2. Disconnect the red wires from the limit thermostat. 3. Check for continuity across the limit thermostat terminals with an ohmmeter.
SERVICE (cont.) 7. Touching the free end of the jumper to the brewer's frame simulates a "FULL" condition, preventing jumper from touching the brewer's frame simulates "NEED WATER" condition. Connect the brewer to the power source, simulate each condition while measuring the voltage between T1 and T3 on the liquid level board. The indication should be 0 volts with jumper touching the frame and 230 volts ac not touching the frame. Repeat these several times.
SERVICE (cont.) LIQUID LEVEL BOARD AND LEVEL PROBE (cont.) Removal and Replacement: 1. Remove all wires from the liquid level board. 2. Remove the #10-32 screw and flat washer securing the protective shield to the component bracket. 3. Remove the #10-32 screw and internal tooth lockwasher securing the liquid level board to the component bracket. 4. Remove liquid level board and discard. 5. Install new liquid level board on component bracket and secure with a #10-32 screw and internal tooth lockwasher. 6.
SERVICE (cont.) If continuity is present as described, the switch is operating properly. If continuity is not present as described, replace the switch. ON/OFF SWITCH Removal and Replacement: 1. Remove the wires from the switch terminals. 2. Compress the clips on the back side of the switch and gently push them through the opening. 3. Push the new switch into the opening and spread the clips to hold switch. 4. Refer to Fig. 13 and reconnect the wires.
SERVICE (cont.) 3. Disengage the fill tube (1) from the pump assembly (4). 4. Remove the four #8-32 screws (6) securing the pump assembly (4) to the component bracket (7). 5. Remove pump assembly (4). 6. Remove pump gasket (5) and inspect, replace if necessary. 7. Position gasket (5) on component bracket (7). 8. Install new pump assembly (4) on component bracket (7) and secure with four #8-32 screws (6). 9. Install fill tube (1) on pump assembly (4). 10.
SERVICE (cont.) Removal and Replacement: 1. Remove the wires from the switch terminals. 2. Compress the clips on the back side of the switch and gently push them through the opening. 3. Push the new switch into the opening and spread the clips to hold switch. 4. Refer to Fig. 17 and reconnect the wires.
SERVICE (cont.) 7. Check the solenoid valve for coil action. Connect the dispenser to the power source. Listen carefully in the vicinity of the solenoid valve for a "clicking" sound as the coil magnet attracts. SOLENOID If the sound is heard as described and water will not pass through the solenoid valve, there may be a blockage in the water line before the solenoid valve or, the solenoid valve may require inspection for wear, and removal of waterborne particles.
SERVICE (cont.) START SWITCH (BREW) Removal and Replacement: 1. Remove the wires from the switch terminals. 2. Compress the clips on the back side of the switch and gently push them through the opening. 3. Push the new switch into the opening and spread the clips to hold switch. 4. Refer to Fig. 21 and reconnect the wires.
SERVICE (cont.) Removal and Replacement: NOTE: Measure the distance from the top of the switch plunger to the hood cover. The same distance is needed when the new switch is installed. 1. Remove nut securing switch to hood cover and remove switch. 2. Install new switch. Refer to Fig. 23 and reconnect the wires. 3. Install all panels. 4. Test action of swing arm and switch for activation. 5. Adjust switch assembly up or down as needed for proper operation. NOTE: Do not remove cam assembly from swing spout.
SERVICE (cont.) Removal and Replacement: 1. Remove the thermal fuses from the tank heater. 2. Remove the four #8-32 screws securing the tank heater to the component bracket. 3. Remove tank heater and gasket. 4. Position new tank heater and gasket on the component bracket and secure with four #8-32 screws. 5. Refer to Fig. 25 and reconnect the wires. TANK HEATER RED (Thermal Fuse) to Contactor Lower Right Terminal) P2180 FIG.
SERVICE (cont.) THERMAL FUSES FIG. 26 THERMAL FUSES P2121.40 Location: The thermal fuses are mounted between the tank heater terminals and the contactor terminals. Test Procedures: 1. Disconnect the brewer from the power source. 2. Disconnect the thermal fuse from the tank heater terminal and the contactor lead. 3. Check for continuity across the terminals on the ends of each thermal fuse. If continuity is present as described, the thermal fuse is operating properly.
SERVICE (cont.) TIMER If voltage is present as described, proceed to #8. If voltage is not present as described, refer to the wiring diagram and check the brewer wiring harness. 8. Disconnect the black and white wires to the swing arm switch and pump leads. 9. With a voltmeter check the voltage across the black and white wires when the "ON/OFF" switch is in the "ON" (upper) position and the start switch pressed to the start position and released. Connect the brewer to the power source.
SERVICE (cont.) DIGITAL BREW TIMER (Late Models) 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 terminals TL1 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 230 volts ac. If voltage is present as described, the brew timer is operating properly.
SERVICE (cont.) DIGITAL BREW TIMER (Late Models) within two seconds after the third break in the water stream causes the volume setting to be aborted and previous volume setting will remain in memory.) Each time the switch is pressed, two seconds are added to the brew time period. Allow the brew cycle to finish in order to verify that the desired volume has been achieved. 3. Setting programming disable feature.
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