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- Operating & Service Manual
Bunn SRUA Operating & Service Manual
Summary of SRUA
Page 1
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 srua bunn ® 10067.0003a 07/02 ©2002 bunn-o-matic corporation.
Page 2
Page 2 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. 10067.3 070102 bunn-o-matic commercial product warranty bunn...
Page 3
Page 3 #00831.0000 #00656.0000 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. #00878.0000 #12593.0000 #03408.0000 #03409....
Page 4
Page 4 electrical requirements caution - the brewer must be disconnected from the power source until specified in initial set-up. Electrical installation instructions caution – improper electrical installation can damage the equipment and injure the installer. The chassis must be properly grounded. ...
Page 5
Page 5 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. Electrician's and plumber's instructions are provided. These instruction...
Page 6
Page 6 10067.3 070102 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 pr...
Page 7
Page 7 10067.3 070102 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...
Page 8
Page 8 problem brew cycle will not start probable cause 1. No water 2. No power or incorrect voltage to the brewer 3. Water level below pump housing. (water level in the hot water gauge glass should be approximately half full). 4. Swing arm switch 5. On/off switch remedy water lines and valves to th...
Page 9
Page 9 troubleshooting (cont.) problem 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. No water 3. Solenoid valve 4. Probe 5. Liquid level board refer to service - start switch for testing...
Page 10
Page 10 troubleshooting (cont.) problem water running out of the overflow water is not hot fuse opening probable cause 1. Brewer not level 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 par...
Page 11
Page 11 probable cause 1. Timer 2. Start switch 1. Timer 2. Solenoid valve 3. Lime build-up in swing spout and pump tubing. 1. Filters 2. Hole in bottom of funnel ob- structed. 3. Pump - flow rate 4. Soft water troubleshooting (cont.) problem water keeps running from swing spout inconsistent coffee ...
Page 12
Page 12 troubleshooting (cont.) coffee reservoir overflows brewer is making unusal noises probable cause remedy problem 10067.3 070102 be sure coffee reservoir is empty before brew cycle is started. Refer to service -timer for test- ing procedures. See page 28 or 29 check pump flow rate with a watch...
Page 13
Page 13 disco nnect fro m po wer source bef ore re mov al o f a ny panel or replace me nt of any comp onen t! W ar nin g ! Disc onn ec t f rom pow er so ur ce befo re remo va l o f an y pa nel o r re pl ac em en t o f a ny co mp one nt ! W ar nin g ! At te nt io n: t ur n of f w he n un at te nd ed ...
Page 14
Page 14 service (cont.) 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 th...
Page 15
Page 15 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 ...
Page 16
Page 16 service (cont.) 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. Remove the cap and fuse from the fuse holder. 3. Remove fuse from the cap. 4. Check fo...
Page 17
Page 17 limit thermostat service (cont.) fig. 9 limit thermostat terminals fig. 8 limit thermostat p2180 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 re...
Page 18
Page 18 service (cont.) 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. Test procedures: 1. Disconnect th...
Page 19
Page 19 service (cont.) liquid level board and level probe (cont.) t1 blu to solenoid valve t2 red to on/off switch t3 blk to main harness t4 pnk to level probe fig.11 liquid level board terminals p1733.50 removal and replacement: 1. Remove all wires from the liquid level board. 2. Remove the #10-32...
Page 20
Page 20 dis con nec t f ro m pow er so urc e befo re r em ova l o f a ny pa ne l or repl ac em en t o f an y c om pon ent! W ar ni ng ! Disc on nect fro m p ow er so ur ce befo re r em ova l o f a ny pan el or re pla ceme nt o f a ny co mpon en t! W ar nin g ! At te nt io n: t ur n of f w he n un at...
Page 21
Page 21 service (cont.) pump assembly fig.14 pump assembly p2180 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 le...
Page 22
Page 22 service (cont.) selector switch (half batch option) location: the selector switch is located to the right of the front access panel above the start switch. Test procedures: 1. Disconnect the brewer from the power source. 2. Disconnect the wires from the switch terminals. 3. Check for continu...
Page 23
Page 23 service (cont.) solenoid fig. 18 solenoid p2180 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. Place the on/off...
Page 24
Page 24 start switch (brew) 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. Test procedures: 1. Disconnect the brewer from the power source. 2. Remove the wires from the start switch terminals. 3. Check...
Page 25
Page 25 service (cont.) swing arm switch fig. 22 swing arm switch p2139.40 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. 3. Disconnect the two black w...
Page 26
Page 26 blk (thermal fuse) to contactor lower left terminal) red (thermal fuse) to contactor lower right terminal) service (cont.) tank heater p1746 fig. 24 tank heater p2180 location: the tank heater is located on the front center of the upper component bracket. Test procedures: 1. Disconnect the b...
Page 27
Page 27 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 an...
Page 28
Page 28 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 a...
Page 29
Page 29 service (cont.) digital brew timer (late models) fig. 29 digital brew timer p2211.40 late models 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. Pressure app...
Page 30
Page 30 service (cont.) digital brew timer (late models) blu/blk wire from tl5 to p1 whi/grn wire from tl4 to (whi) pump whi/blu wire from tl3 to (blk) swing arm switch whi wire from tl2 to p2 blk wire from tl1 to p3 j2 - three pin connector from half/full batch switch p2037 fig. 30 digital timer te...
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Page 31 10491.0004a 07/02 © 2002 bunn-o-matic corporation pnk 10067.3 070102.