BUNN ® SRU 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.
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. WARRANTY Bunn-O-Matic Corp. (“Bunn”) warrants the equipment manufactured by it to be commercially free from defects in material and workmanship existing at the time of manufacture and appearing within one year from the date of installation. In addition: 1.
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 #10044.0000 #00878.0000 #03408.0000 #12593.0000 #03409.0000 #12555.0000 #29299.
ELECTRICAL REQUIREMENTS CAUTION - The brewer must be disconnected from the power source until specified in Initial Set-Up. WHITE NEUTRAL L1 BLACK L2 RED L2 RED L2 RED 120V A.C. 208 OR 240V A.C. 120V A.C. L1 BLACK L1 BLACK P1841 SRU Model requires 3wire, grounded service rated 120/208 or 120/240 volts ac, 30 amp, single phase, 60 Hz. Proceed as follows: 208 OR 240V A.C. 230V A.C. P1842 SRUA-CE Models require 2wire, grounded service rated 230 volts ac, 30 amp, single phase, 60 Hz.
ELECTRICAL INSTALLATION INSTRUCTIONS (CONT.) This equipment must be installed to comply with the Basic Plumbing Code of the Building Officials and Code Administrators International, Inc. (BOCA) and the Food Service Sanitation Manual of the Food and Drug Administration (FDA). INITIAL SETUP CAUTION - The brewer must be disconnected from the power source throughout the initial setup, except when specified in the instructions. IMPORTANT: Brewer must be level and installed on a sturdy structure.
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 and server 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. To increase a batch size.
CLEANING NOTE: Tank and tank components should be delimed regularly based on local water conditions. Excessive mineral build up on stainless steel surfaces can initiate corrosion reactions resulting in serious leaks, 1. Remove funnel, funnel lid and support. Under hot water, rinse away all coffee oils. Wipe with a clean damp cloth. 2. Drain coffee reservoir by opening coffee faucet. When empty, close faucet. 3. Cycle two or three inches of water into the coffee reservoir and scrub entire reservoir area.
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 120 volt ac and low voltage dc potential on their terminals.
TROUBLESHOOTING (cont.) PROBLEM Brew cycle will not start (cont) PROBABLE CAUSE 3. Water level below pump housing. (Water level in the hot water gauge glass should be approximately half full). REMEDY Be sure water shut-off valve is open and that the in-line filters or strainers are not blocking water flow. (Do not confuse water shut-off valve with the manual fill and drain valve underneath the brewer). 4. ON/OFF Switch Refer to Service - ON/OFF Switch for testing. See page 22 5.
TROUBLESHOOTING (cont.) PROBLEM Water running out of the overflow Water is not hot PROBABLE CAUSE 1. Brewer not level REMEDY Brewer must be level and installed on a sturdy structure. 2. Solenoid Valve Refer to Service - Solenoid Valve for testing procedures. See page 25 3. Liquid Level Board Refer to Service -Liquid Level Board for testing procedures. See page 20 4. Probe Refer to Service - Probe for testing procedures. See page 20 1.
TROUBLESHOOTING (cont.) PROBLEM Circuit breaker keeps tripping Water keeps running from swing spout Inconsistent coffee yield Funnel overflows PROBABLE CAUSE 1. Circuit Breaker REMEDY Refer to Service - Circuit Breaker for testing procedures. See page 14 2. ON/OFF Switch Refer to Service - ON/OFF Switch for testing procedures. See page 22 3. Brew Circuit Refer to Service - Pump Assembly for testing procedures. See page 23 4.
TROUBLESHOOTING (cont.) PROBLEM Funnel overflows (cont.) Coffee reservoir overflows Brewer is making unusal noises PROBABLE CAUSE 3. Pump - Flow Rate REMEDY 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. 4. Soft Water When using a water softener, a coarse grind of coffee may be preferred. If required, a bypass system is available as an optional feature. 1.
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SERVICE (cont.) CIRCUIT BREAKER (120/208V and 120/240V Three Wire Models) If continuity is not present as described, press the reset button and repeat step 5, if continuity is not present as described, replace the circuit breaker. Removal and Replacement: 1. Remove wires from the circuit breaker. 2. Remove the nut securing the circuit breaker to the component bracket. 3. Remove circuit breaker and discard. 4. Install new circuit breaker on component bracket and secure with nut. 5. Refer to Fig.
SERVICE (cont.) 5. Disconnect the brewer from the power source. If voltage is present as describ 84 20.0006 -1.5 2 2 2l01 8 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. 2A. 120/208V and 120/240V THREE WIRE MODELS Disconnect the black wire from the contactor coil to the limit thermostat and black wire from the white wire on the main harness. 2B.
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SERVICE (cont.) CONTROL THERMOSTAT FIG. 6 CONTROL THERMOSTAT If continuity is present as described, the control thermostat is operating properly. If continuity is not present as described, replace the control thermostat. P2113.40 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 the voltage check points.
SERVICE (cont.) FUSE AND FUSE HOLDER (208V, 240V and 230V Two Wire Models) 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. 9 and reconnect the wires.
SERVICE (cont.) LIMIT THERMOSTAT BLK to Contactor coil (All Models Except 230V CE Models) Red to Contactor Coil (230V CE Models) BLK to Control Thermostat(All Models Except 230V CE Models) RED to Control Thermostat (230V CE Models) P1984 FIG. 10 LIMIT THERMOSTAT P1732 FIG. 11 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.
SERVICE (cont.) LIQUID LEVEL BOARD AND LEVEL PROBE FIG.12 LIQUID LEVEL BOARD AND LEVEL PROBE Location: P2208.40 5. Reconnect the blue wire to T1 on the liquid level board. 6. Carefully connect a piece of insulated jumper wire to T4. Keep the other end of this wire away from any metal surface of the brewer. 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.
SERVICE (cont.) LIQUID LEVEL BOARD AND LEVEL PROBE (cont.) 8. Disconnect the brewer from the power source and remove the jumper wire from T4. 14. Disconnect the brewer from the power source. If voltage is present as described, liquid level board is operating properly, proceed to #9. If voltage is not present as described, replace the liquid level board. If voltage is present as described, reinstall the level probe, the liquid level board and level probe are operating properly.
SERVICE (cont.) ON/OFF SWITCH 6. a) 120/208V, 120/240V, 208V and 240V Models Check for continuity across the terminals on the rear of the switch with the switch in the "ON" (upper) position. Continuity must not be present when the switch is in the "OFF" (lower) position. b) 230V - CE Models - Check for continuity across the center terminal (2) and the lower terminal (1) when the switch is in the "ON" (upper) position. Continuity must not present when the switch is in "OFF" (lower) position.
SERVICE (cont.) PUMP ASSEMBLY FIG.16 PUMP ASSEMBLY P2113.40 Location: The pump is located on the right of the component bracket. 2. Loosen the #8-32 screw (2) securing the clamp (3) on the fill tube (1) and slide the clamp (3) up the fill tube (1). 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.
SERVICE (cont.) SELECTOR SWITCH (HALF BATCH OPTION) P2053.25 FIG. 18 SELECTOR SWITCH (HALF BATCH) Location: The selector switch is located in the center of the front access panel at the base of the urn on all models except the 230V CE Models. The selector switch is located to the right of the front panel, above the start switch on the 230V CE Models. Test Procedures: 1. Disconnect the brewer from the power source. 2. Disconnect the wires from the switch terminals. 3.
SERVICE (cont.) SOLENOID FIG. 20 SOLENOID P2113.40 Location: The solenoid is mounted on the upper left rear of the component bracket. Test Procedures: 1. Disconnect the brewer from the power source. 2. A) For 120/208 volt and 120/240 volt 3-wire, single phase models, disconnect the black wire from the liquid level board #2 and the white wire on the solenoid. Check the voltage across the black and the white wire with a voltmeter. Connect the brewer to the power source.
SERVICE (cont.) SOLENOID 10. Install water inlet tube to connector on the solenoid. 11. Turn on the water supply to the brewer. 12. Refer to Fig. 21 and reconnect the wires. BLU from Liquid Level Board #1 WHI from Main Harness (120/208V and 120/240V Models) RED from Main Harness (208V and 240V Models) BLU from Liquid Level Board #1 BLK from Main Harness 230V - CE MODELS FIG. 21 SOLENOID TERMINALS P1741.
Test Procedures: 1. Disconnect the brewer from the power source. 2. Remove the wires from the start switch terminals. 3. Check for continuity across the switch terminals when the switch is held in the lower position. Continuity must not be present when the switch is in the upper position. START SWITCH (BREW) If continuity is present as described, reconnect the wires the switch is operating properly. If continuity is not present as described, replace the switch. P2053.25 Removal and Replacement: 1.
SERVICE (cont.) Removal and Replacement: 1. Remove the wires or 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 HEATERS RED to Contactor T2 (120/ 208V, 120/240 Three Wire Single Phase, 208V and 240V Two Wire, Single Phase) P2113.40 FIG.
SERVICE (cont.) THERMAL FUSES (230V-CE MODELS ONLY) FIG. 26 THERMAL FUSES P2121.40 Location: The thermal fuses are mounted on the tank heater 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 the thermal fuse. If continuity is present as described, the thermal fuse is operating properly.
TIMER (Early Models) P2114.40 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. Disconnect the polarized, three pin connector from the brewer main harness and rotate the brew timer dial fully counterclockwise. 3.
SERVICE (cont.) TIMER (Early Models)(cont.) Removal and Replacement: 1. Separate all connectors between the brewer wiring harness and the timer. 2. Disconnect the timer leads from the pump leads. 3. Remove the two #8-32 screws securing the brew timer to the component bracket and remove timer. 4. Install new timer circuit board as described in Late Model Timer section on the following pages. 5. Refer to Fig. 30 to reconnect the wires. 6.
SERVICE (cont.
SERVICE (cont.) DIGITAL BREW TIMER (Late Models) 1. Modifying brew volumes. To modify a brew volume, first check that the SET/LOCK switch is in the “SET” position on the circuit board. To increase a brew volume, place the ON/OFF switch in the “ON” position, press and hold the START switch until you see three breaks in the water stream from the swing arm. Release the switch and press it again one or more times.
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