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Bunn GMB-PS - page 1
OPERA TING & SER VICE MANU AL B UNN-O-MA TIC CORPORA TION POST OFFICE BOX 3227 SPRINGFIELD, ILLINOIS 62708-3227 PHONE: (217) 529-6601 F AX: (217) 529-6644 27479.0000D 12/00 ©1996 Bunn-O-Matic Corporation GMB-PS C A U T IO N D I S C A R D D E C A N T E R I F : . CRACKED . SCRATCHED . BOILED DRY . HEATED WHEN EMPTY . USED ON HIGH FLAME . OR EXPO ...
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Bunn GMB-PS - page 2
Page 2 INTRODUCTION This equipment will brew a half-gallon batch of coffee into an awaiting dispenser at the push of a button and includes a hot water faucet for allied beverage use. 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 ...
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Bunn GMB-PS - page 3
Page 3 USER NOTICES Carefully read and follow all notices in this manual and on the equipment. All labels on the equipment should be kept in good condition. Replace any unreadable or damaged labels. #00831.0000 This equipment is to be installed to comply with the Basic Plumbing Code of the Building Officials and Code Administrators International, I ...
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Bunn GMB-PS - page 4
Page 4 ELECTRICAL REQUIREMENTS CAUTION - The brewer must be disconnected from the power source until specified in Initial Set-Up. Model 15 has an attached cordset and requires 2-wire grounded service rated 120 volts ac, 15 amp, single phase, 60 Hz. Model 35 requires 3-wire, grounded service rated 120/208 or 120/240 volts ac, 20 amp, single phase, 6 ...
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Bunn GMB-PS - page 5
Page 5 1. Attach the flare fitting from the short piece of tubing on the strainer (supplied) to the water inlet fitting at the left rear of the brewer. 2. Flush the water line and securely attach it to the flare fitting on the strainer. 3. Turn on the water supply. 4. Place an empty vessel beneath the faucet and lift the handle until water is dispe ...
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Bunn GMB-PS - page 6
Page 6 27479 121500 T o decrease a batch size. Press and release the ST ART or BREW switch once for every two-second inter val to be removed from the total brew time period; then immediately press and hold down the ST ART or BREW switch until three clicks are heard. Release the switch. (Failure to release the switch within two seconds after the thi ...
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Bunn GMB-PS - page 7
Page 7 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 ...
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Bunn GMB-PS - page 8
Page 8 TROUBLESHOOTING (cont.) Brew cycle will not start (cont.) Water is not hot PROBABLE CAUSE REMEDY Refer to Service - ON/OFF Switch for testing. See page 16 Refer to Service - Start Switch for testing procedures. See page 18 Refer to Service - Timer for testing procedures. See page 20 or 21 Refer to Service - Solenoid Valve for testing procedu ...
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Bunn GMB-PS - page 9
Page 9 TROUBLESHOOTING (cont.) PROBLEM Inconsistent beverage level in dis- penser Consistently low beverage level in the dispenser PROBABLE CAUSE 1. Flow control (.175 GPM) 2. Strainer 3. Syphon System 4. Lime Build-up CAUTION - Tank and tank compo- nents should be delimed regularly depending on local water condi- tions. Excessive mineral build-up ...
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Bunn GMB-PS - page 10
Page 10 TROUBLESHOOTING (cont.) PROBLEM Consistently low beverage level in the dispenser (cont.) Spitting or excessive steaming Dripping from sprayhead Water flows into tank continuously (ON/OFF Switch "ON") PROBABLE CAUSE 3. Strainer 1. Lime Build-up CAUTION - Tank and tank compo- nents should be delimed regularly depending on local wate ...
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Bunn GMB-PS - page 11
Page 11 TROUBLESHOOTING (cont.) PROBLEM Water flows into tank continuously (ON/OFF Switch "OFF") Beverage overflows dispenser Weak beverage PROBABLE CAUSE 1. Solenoid Valve 1. Dispenser 2. Timer 3. Solenoid Valve 1. Filter Type 2. Coffee Grind 3. Sprayhead 4. Funnel Loading 5. Water Temperature REMEDY Remove the solenoid valve and clear a ...
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Bunn GMB-PS - page 12
Page 12 TROUBLESHOOTING (cont.) PROBLEM Dry coffee grounds remain in the funnel Brewer is making unusal noises PROBABLE CAUSE 1. Funnel Loading 1. Solenoid Valve 2. Plumbing Lines 3. Water Supply 4. Tank Heater REMEDY The BUNN ® paper filter must be centered in the funnel and the bed of grounds leveled by gently shak- ing. The nut on the solenoid ...
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Bunn GMB-PS - page 13
Page 13 C A U TIO N DISCARD DECANTER IF: . C R A C K E D . S C R A T C H E D . B O IL E D D R Y . H E A T E D W H E N E M P T Y . U S E D O N H IG H F L A M E . O R E X P O S E D E L E C T R IC E L E M E N T S ...
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Bunn GMB-PS - page 14
Page 14 O N O F F S T A R T SERVICE (cont.) CONTROL THERMOSTAT Location: The control thermostat is located inside the hood on the right side. Test Procedures: 1. Disconnect the brewer from the power source. 2. With a voltmeter, check the voltage across the blue/black wire on the control thermostat and the white wire on the power cord for 120 volt m ...
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Bunn GMB-PS - page 15
Page 15 ...
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Bunn GMB-PS - page 16
Page 16 ON OFF START B U N N 90 psig max operating pressure S trainer/Flow Control # 24222.0222 R epl. Flow W asher #20526.0222 ) (Repl. Screen #23721.0000) .222 gpm FLOW SERVICE (cont.) ON/OFF SWITCH Location: The ON/OFF switch is located on the left front of the hood. Test Procedure: 1. Disconnect the brewer from the power source. 2. Viewing the ...
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Bunn GMB-PS - page 17
Page 17 SERVICE (cont.) SOLENOID VALVE Location: The solenoid valve is located inside the bottom right side of the trunk mounted on the base. Test Procedures: 1. Disconnect the brewer from the power source. 2. Disconnect the white/red and white/green wires from the solenoid valve. With the "ON/OFF" switch in the "ON" upper posit ...
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Bunn GMB-PS - page 18
Page 18 SERVICE (cont.) START SWITCH Location: The start switch is located in the right front of the hood just to the left of faucet. Test Procedure: 1. Disconnect the brewer from the power supply. 2. Disconnect the white/orange wire from the top switch terminal and the white/yellow from the bottom switch terminal. 3. Check for continuity across th ...
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Bunn GMB-PS - page 19
Page 19 O N O F F S T A R T TANK HEATER Location: The tank heater is located inside the tank and secured to the tank lid. Test Procedures: 1. Disconnect the brewer from the power supply. 2. With a voltmeter, check the voltage across the black and white wires on 120 volt models or the black and red wires for 120/208 or 120/240 volt models, 200 volt ...
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Bunn GMB-PS - page 20
Page 20 ...
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Bunn GMB-PS - page 21
Page 21 SERVICE (cont.) 27479 091596 DIGITAL TIMER (Late Models) ...
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Bunn GMB-PS - page 22
Page 22 27479 121500 T o increase a brew volume, place the ON/OFF switch in the "ON" position, press and hold the ST ART switch until three clicks are heard. Release the switch and press it again one or more times. (Failure to re- lease the switch within two seconds after the third click causes the volume setting to be aborted and pre- vi ...
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Bunn GMB-PS - page 23
Page 23 27479 091596 ...
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Bunn GMB-PS - page 24
Page 24 27479 091596 ...
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