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INTRODUCTION This equipment will brew a half-gallon, gallon, or gallon and a three fourths batch of coffee into an awaiting server at the push of a button and includes a hot water faucet for allied beverage use. The brewer is specifically ® designed for use with a BUNN .5 gallon and 1.75 gallon server. It is only for indoor use on a sturdy counter or shelf. WARRANTY Bunn-O-Matic Corp. (“Bunn”) warrants the equipment manufactured by it to be commercially free from defects in material and workma
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Electrical Hook-Up CAUTION – Improper electrical installation will damage electronic components. 1. An electrician must provide electrical service as specified. 2. Using a voltmeter, check the voltage and color coding of each conductor at the electrical source. 3. Remove the front panel beneath the sprayhead. Models with electronic control assemblies: Place the tank heater switch at the top of the control assembly in the “OFF” position. Models with electro/mechanical thermostats: Rotate the cont
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INITIAL SET-UP CAUTION – The brewer must be disconnected from the power source throughout the initial set-up, except when specified in the instructions. NOTE: ECA Models Only - This brewer is equipped with a temperature sensor that indicates when to brew and, when selected, locks-out the start of a brew cycle until the water has heated to the optimum brewing temperature. 1. Remove the front panel beneath the sprayhead. Models with electronic control assemblies: Place the tank heater switch at th
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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. Press
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OPERATING CONTROLS BREW SELECTOR SWITCH 1 3 Placing the switch in the ⁄2 Gal, 1 Gal, or 1 ⁄4 Gal position selects the amount of coffee to be brewed in subsequent brew cycles. Repositioning this switch after a brew cycle has been initiated does not change the brew batch in progress. ON/OFF SWITCH Placing the switch in the unlighted lower position cuts power to the server sensor and stops brewing. Stopping a brew cycle after it has been started will not stop the flow of water from the funnel. P
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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 - 240 volt ac and low voltage dc potential on their terminals. Shorting of terminals or the
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TROUBLESHOOTING (cont.) Problem Probable Cause Remedy Brew cycle will not start (cont.) 3. Water strainer/flow control (.500 (A) Direction of flow arrow must be GPM) pointing towards brewer. (B) Remove the strainer/flow con- trol and check for obstructions. Clear or replace. 4. ON/OFF switch Refer to Service - ON/OFF switch for testing procedures. See page 31 5. Start switch Refer to Service - Start switch for testing procedures. See page 35 6. Timer Refer to Service - Timer for testing procedu
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TROUBLESHOOTING (cont.) Problem Probable Cause Remedy Automatic refill will not operate 3. Overflow protection switch Refer to Service - Overflow protec- (cont.) tion switch for testing procedures. See page 32 4. (A) Level control board & level Service - Level control board Refer to probe. (Electro/mechanical) for testing procedures. See page 28 (B) Control Assembly (Electronic) Refer to Service - Electronic con- trols for testing procedures. See page 23 thru 27 5. Solenoid Valve Refer to
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TROUBLESHOOTING (cont.) Problem Probable Cause Remedy Water from tank is not hot (cont.) 2. (A) Control Thermostat (Electro/ Refer to Service - Control thermo- mechanical) stat for testing procedures. See page 20 (B) Control assembly (Electronic) Service - Control assembly Refer to for testing procedure. See page 23 thru 27 3. Contactor (Electro/mechanical) Refer to Service - Contactor for test procedures. See page 18 4. Tank heater Refer to Service - Tank heater for testing procedures. Se
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TROUBLESHOOTING (cont.) Problem Probable Cause Remedy Inconsistent beverage level in server. 1. Strainer/flow control (.500 GPM) (A) Direction of flow arrow must be pointing towards the brewer. (B) Remove the strainer/flow con- trol and check for obstructions. Clear or replace. 2. Improper water pressure Check the operating water pressure to the brewer. It must be between 20 and 90 psi (138 and 620 kPa) 3. Dispense valve Refer to Service - Dispense valve for testing procedures. See page 22 Cons
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TROUBLESHOOTING (cont.) Problem Probable Cause Remedy ® Weak beverage 1. Type of paper filters BUNN paper filters should be used for proper extraction. 2. Coffee A sufficient quantity of fresh drip or regular grind should be used for proper extraction. 3. Sprayhead B.O.M. sprayhead #01082.0002 should be used to properly wet the bed of ground coffee in the funnel. ® 4. Funnel loading The BUNN paper filter should be centered in the funnel and the bed of ground coffee leveled by gentle shak- ing.
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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. The brewer should be unplugged when servicing, except when electrical tests are re- quired and the test procedure specifically states to plug-in th
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9. Check for continuity across the pink wire and gray SERVICE (cont.) wire on the selector switch when the switch in the BREW SELECTOR SWITCH 1 gallon position. Continuity must not be present in any other position. 10. Reconnect the pink, gray and tan wires on the selector switch to the pink, gray and tan wires on the interface. Bypass Valve: 11. Disconnect the white/violet on the selector switch from the bypass valve coil and disconnect the white/red from the dispense valve coil. 12. Check for
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SERVICE (cont.) CONTACTOR ASSEMBLY (W/ MECHANICAL THER- MOSTAT ONLY) (cont.) If continuity is present as described, the contactor is operating properly. If continuity is not present as described, replace the contactor. Removal and Replacement: 1. Remove all wires from the contactor. 2. Remove the two #10-32 slotted head screw secur- ing contactor to the inside of the hood. 3. Securely install the new contactor inside the hood. 4. Refer to the illustration below when reconnecting the wires. P828
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