Bunn SRUA Operating & Service Manual
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Bunn SRUA Operating & Service Manual

Bunn SRUA Operating & Service Manual

Operating & service manual - srua
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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
www.bunnomatic.com
10067.0003A 07/02 ©2002 Bunn-O-Matic Corporation

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  • Page 1 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 www.bunnomatic.com 10067.0003A 07/02 ©2002 Bunn-O-Matic Corporation...
  • Page 2 SOLE OPTION 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: User Notices

    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...

  • Page 4: Electrical Requirements

    3/8" flare. NOTE - Bunn-O-Matic recommends 3/8" copper tubing for installations from the 1/2" water supply line. Bunn- O-Matic does not recommend the use of a saddle valve to install the brewer. The size and shape of the hole made in the supply line by this type of device may restrict water flow.

  • Page 5: Initial Setup

    PLUMBING REQUIREMENTS(cont.) 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.

  • Page 6: 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.

  • Page 7: 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 ®...

  • 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 Technical Service Department. • Inspection, testing, and repair of electrical equipment should be performed only by qualified service personnel.
  • Page 9 TROUBLESHOOTING (cont.) PROBLEM Brew cycle will not start (cont.) Tank not filling PROBABLE CAUSE 6. Start Switch 7. Timer 8. Pump 9. Solenoid Valve 10. Strainer 1.ON/OFF Switch (This switch must be in the "ON" position for the refill circuit to operate. 2.
  • Page 10 2. Solenoid Valve 3. Liquid Level Board 4. Probe 1. Limit Thermostat CAUTION - Do not eliminate or bypass limit thermostat. Use only Bunn-O-Matic replacement part #29329.1000. 2. Control Thermostat 3. Tank Heater 4. Contactor 5. Thermal fuses 1. Fuse 2.
  • Page 11 See page Remove swing spout and insert deliming rod down into pump tub- ing as far as possible. Use Bunn filters made for the SRU brewer. Remove obstruction. Check pump flow rate with a watch. Pump flow rate should be approxi- mately 24 ounces in 15 seconds.
  • Page 12 TROUBLESHOOTING (cont.) PROBLEM Coffee reservoir overflows Brewer is making unusal noises PROBABLE CAUSE 1. Coffee reservoir not completely empty before a brew cycle was started. 2. Timer 3. Pump - Flow Rate 1. Plumbing lines 2. Water supply 3. Tank Heater Page 12 REMEDY Be sure coffee reservoir is empty...

  • Page 13: Table Of Contents

    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 should be performed only by qualified service personnel.

  • Page 14: Contactor

    SERVICE (cont.) CONTACTOR FIG. 2 CONTACTOR Location: The contactor is located inside the front lower access panel, left of center on the component bracket. Test Procedures: 1. Disconnect the brewer from the power source. 2 Disconnect the red wire from contactor coil to the control thermostat and the black wire from the contactor coil to the main harness.

  • Page 15: Control Thermostat

    SERVICE (cont.) CONTROL THERMOSTAT FIG. 4 CONTROL THERMOSTAT 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.

  • Page 16: Fuse And Fuse Holder

    SERVICE (cont.) FUSE AND FUSE HOLDER FIG.6 FUSE AND FUSE HOLDER Location: The fuse and fuse holder are located on the rear of the urn behind the rear utility cover. Test Procedures: 1. Disconnect the brewer from the power source. 2.

  • Page 17: Limit Thermostat

    SERVICE (cont.) LIMIT THERMOSTAT FIG. 8 LIMIT THERMOSTAT 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 thermo- stat.

  • Page 18: Liquid Level Board And Level Probe

    SERVICE (cont.) LIQUID LEVEL BOARD AND LEVEL PROBE FIG.10 LIQUID LEVEL BOARD AND LEVEL PROBE Location: The liquid level board is located behind the lower front access panel, to the right of center on the component bracket. The level probe is located on the right front of the upper component bracket.
  • Page 19 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 secur- ing 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.

  • Page 20: On/Off Switch

    SERVICE (cont.) ON/OFF SWITCH DI SC IN G T OF L OF W ER Y PA Y CO L OR IN G W ER Y PA L OF Y CO T OF DI SC : TU FIG.12 ON/OFF SWITCH Location: The ON/OFF switch is located on the left side of the lower front access panel.

  • Page 21: Pump

    SERVICE (cont.) PUMP ASSEMBLY FIG.14 PUMP ASSEMBLY Location: The pump is located on the right of the upper component bracket. Test Procedures: 1. Disconnect the brewer from the power source. 2. Disconnect the black wire from the black lead on the pump and the red wire from the black lead on the pump.

  • Page 22: Selector Switch (Half Batch)

    SERVICE (cont.) SELECTOR SWITCH (HALF BATCH OPTION) DI SC IN G T OF L OF W ER Y PA Y CO L OR IN G L OR W ER Y PA L OF Y CO T OF DI SC : TU FIG.

  • Page 23: Solenoid

    SERVICE (cont.) SOLENOID FIG. 18 SOLENOID Location: The solenoid is mounted on the upper left rear of the component bracket. Test Procedures: 1. Drain 1/2 gallon of water from the faucet in order to activate the probe. 2. Disconnect the brewer from the power source. 3.

  • Page 24: Start Switch (Brew)

    SERVICE (cont.) START SWITCH (BREW) DI SC IN G T OF L OF W ER Y PA Y CO L OR IN G L OR W ER Y PA L OF Y CO T OF DI SC : TU FIG. 20 START SWITCH (BREW) Location: The brew start switch is located on the lower right of the front access panel, beneath the selector switch.

  • Page 25: Swing Arm Switch

    SERVICE (cont.) SWING ARM SWITCH FIG. 22 SWING ARM SWITCH Location: The swing arm switch is attached to the cupola cover. Test Procedures: 1. Disconnect the brewer from the power source. 2. Remove the cupola cover end caps, swing spout and cupola cover.

  • Page 26: Tank Heater

    SERVICE (cont.) TANK HEATER FIG. 24 TANK HEATER Location: The tank heater is located on the front center of the upper component bracket. Test Procedures: 1. Disconnect the brewer from the power source. 2. Disconnect the wires from the tank heater. 3.

  • Page 27: Thermal Fuse

    SERVICE (cont.) THERMAL FUSES FIG. 26 THERMAL FUSES 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.

  • Page 28: Timer

    SERVICE (cont.) TIMER M IN -1 20 P/ N EARLY MODELS FIG. 27 TIMER Location: The timer is located behind the front access panel on the right side of the component bracket. Test Procedures: 1. Disconnect the brewer from the power source. 2.

  • Page 29: Digital Timer

    SERVICE (cont.) DIGITAL BREW TIMER (Late Models) LATE MODELS FIG. 29 DIGITAL BREW TIMER Location: The timer is located inside the front of the trunk on the top of the component bracket. Test Procedure. NOTE: Do not remove or install wires while timer board is installed.
  • Page 30 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.
  • Page 31 10491.0004A 07/02 © 2002 BUNN-O-MATIC CORPORATION Page 31 10067.3 070102...

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