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®
BUNN
U3
U3A
OPERATING & SERVICE MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
10060.0000G 8/00 ©1984 Bunn-O-Matic Corporation
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INTRODUCTION This brewer will brew a three gallon batch of coffee into each reservoir (one at a time). Each reservoir has its own dispensing faucet(s).The brewer also has a hot water faucet(s) 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 insta
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ELECTRICAL REQUIREMENTS CAUTION - The brewer must be disconnected from the power source until specified in Initial Set-Up. L2 RED L2 RED 208V OR 240V 120V A.C. 380V OR 440V L3 BLUE WHITE 208 OR 208V OR 240V 380V OR 440V 240V A.C. NEUTRAL 208V OR 240V 120V A.C. 380V OR 440V L1 BLACK L1 BLACK P1841 P1843 U3 & U38 requires 3-wire, grounded service rated U333 & U3833 requires 3-wire, grounded service 120/208 or 120/240 volts ac, U3-30 amp,U38-40 amp, rated 240 volt ac, 35 amp or 440 volts ac, 30
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ELECTRICAL INSTALLATION INSTRUCTIONS (CONT.) 6. If plumbing is to be hooked up later be sure the brewer is disconnected from the power source. If plumbing has been hooked up, the brewer is ready for Initial Setup. NOTE: Schematic wiring diagrams are included in this manual. PLUMBING REQUIREMENTS These brewers must be connected to a cold water system with operating pressure between 20 (138) and 90 psi (620 kPa) from a 1/2" or larger supply line. A shut-off valve should be installed in the line
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INITIAL SETUP (cont.) 6. Brewing 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. The ° recommended brewing temperature is approximately 200 F (93°C). Water temperature may be increased by turning thermostat knob clockwise, decreased by turning knob counterclockwise. 7. When desired temperature is reached, insert funnel support, funnel and fu
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COFFEE BREWING 1. Brewing 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. ® filter in funnel and add desired amount of coffee. 2. Insert Bunn 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. Turn "ON/OFF" switch
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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. Shorting of terminals or the appl
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TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY Brew cycle will not start (cont) (A4) Check the terminal block for 2. No power or incorrect voltage to the brewer (cont) 440 volts ac across the black and blue terminals, black and red termi- nals and the red and blue terminals on four wire three phase 440 volt models. (B) Check circuit breakers or fuses. 3. Water level below pump housing. Be sure water shut-off valve is open and that the in-line filters or strain- (Water level in the hot wat
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TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY Tank not filling 1.ON/OFF Switch (This switch Refer to Service - ON/OFF Switch must be in the "ON" position for the for testing procedures. See page refill circuit to operate. 22 2. No water Be sure water shut-off is open and that in-line filters or strainers are not blocking water flow. (Do not confuse water shut-off valve with the manual fill and drain valve un- derneath brewer). 3. Solenoid Valve Refer to Service - Solenoid Valve for testi
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TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY Water not hot 1. Limit Thermostat Refer to Service - Limit Thermo- CAUTION - Do not eliminate or stat for testing procedures. See bypass limit thermostat. Use only page19 Bunn-O-Matic replacement part #29329.1000 2. Control Thermostat Refer to Service - Control Ther- mostat for testing procedures. See page 17 3. Tank Heater(s) Refer to Service - Tank Heater for testing procedures. See page 30 4. Contactor Refer to Service - Contactor for tes
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TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY Check pump flow rate with a watch. 3. Pump - Flow Rate Funnels overflow (cont.) Pump flow rate should be approxi- mately 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 pre- ferred. If required, a bypass sys- tem is available as an optional feature. Coffee reservoir overflows Be sure coffee reservoir is empty 1. Coffee reservoir not complete
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SERVICE (cont.) 4. With the black wire removed, remove the other CIRCUIT BREAKER (120/208V and 120/240V Three black wire from the circuit breaker. Wire Models and 440V Four Wire Models) 5. Check for continuity across the terminals on the circuit breaker. If continuity is present as described the circuit breaker is operating properly. 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
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SERVICE (cont.) CONTACTOR (cont.) Removal and Replacement: 9. Check for continuity across the terminals on the 1. Disconnect all the wires from the contactor. left side of the contactor by manually closing the 2. Remove the two #8-32 screws securing the contacts. Continuity must not present when the contactor to the contactor mounting bracket, re- contact is released. move contactor and protective shield. Discard 10. Check for continuity across the terminals on the contactor. right side of the c
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