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®
BUNN
GMB-PS
OPERATING & SERVICE MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
27479.0000D 12/00 ©1996 Bunn-O-Matic Corporation
! WARNING
Disconnect from power source
before removal of any panel or
replacement of any component!
! CAUTION
DISCARD DECANTER
IF:
. CRACKED
. SCRATCHED
. BOILED DRY
. HEATED WHEN EMPTY
. USED ON HIGH FLAME
FUNNEL CONTENTS . OR EXPOSED ELECTRIC
ELEMENTS
ARE HOT
FAILURE
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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 defects in material and workmanship existing at the time of manufacture and appearing within one year from the date of installation. In addition: 1.) Bunn warr
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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. This equipment is to 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). #00656.0000 #10044.0000 ! WARNING ! WARNING Fill water tank before tur
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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. L2 RED WHITE 120 V.A.C. WHITE 208 OR 240 V.A.C. NEUTRAL 120V.A.C. NEUTRAL 120 V.A.C. L1 BLACK L1 BLACK P2185 P1841 P2193 Model 20 requires 2-wire, Model 35 requires 3-wire, “A" & "B” models require 2- grounded service rated 120 volts grounded service rated 1
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PLUMBING REQUIREMENTS (cont.) 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 dispensed. P1939 INITIAL SET-UP CAUTION - The brewer must be disconnected from the power source throughout the initial set-up, exce
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ADJUSTING BREW VOLUMES (cont.) To decrease a batch size. Press and release the START or BREW switch once for every two-second interval to be removed from the total brew time period; then immediately press and hold down the START or BREW switch until three clicks are heard. Release the switch. (Failure to release the switch within two seconds after the third click causes the volume setting to be aborted and previous volume setting will remain in memory). Allow the brew cycle to finish in order to
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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.) 3. ON/OFF Switch Refer to Service - ON/OFF Switch for testing. See page 16 4. Start Switch Refer to Service - Start Switch for testing procedures. See page 18 5. Timer Refer to Service - Timer for testing procedures. See page 20 or 21 6. Solenoid Valve Refer to Service - Solenoid Valve for testing procedures. See page 17 7. Water flow control (.222 GPM) (A) Direction of flow arrow must be pointing towards bre
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TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY Inconsistent beverage level in dis- 1. Flow control (.175 GPM) (A) Direction of flow arrow must penser be pointing towards the brewer. (B) Remove the flow control and check for obstructions. Clear or replace. 2. Strainer (A) Direction of flow arrow must be pointing towards the brewer. (B) Remove the strainer and check for obstructions. Clear or replace. 3. Syphon System The brewer must be level or slightly lower in front to syphon properly. 4
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TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY Consistently low beverage level in 3. Strainer (A) Direction of flow arrow must the dispenser (cont.) be pointing towards brewer. (B) Remove the strainer and check for obstructions. Clear or replace. Spitting or excessive steaming 1. Lime Build-up Inspect tank assembly for exces- CAUTION - Tank and tank compo- sive lime deposits. Delime as re- nents should be delimed regularly quired. depending on local water condi- tions. Excessive mineral b
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TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY Water flows into tank continuously 1. Solenoid Valve Remove the solenoid valve and (ON/OFF Switch "OFF") clear any obstructions. Rebuild or replace the valve if necessary. See page 17 Beverage overflows dispenser 1. Dispenser The dispenser must be completely empty before starting a brew cycle. Refer to Service - Timer for testing 2. Timer procedures. See page 20 or 21 3. Solenoid Valve Remove the solenoid valve and clear any obstructions. Reb
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TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY ® Dry coffee grounds remain in the 1. Funnel Loading The BUNN paper filter must be funnel centered in the funnel and the bed of grounds leveled by gently shak- ing. Brewer is making unusal noises 1. Solenoid Valve The nut on the solenoid must be tight or it will vibrate during op- eration. 2. Plumbing Lines Plumbing lines should not resting on the counter top. 3. Water Supply (A) The brewer must be connected to a cold water line. (B) Water pr
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to the power source. The indication must be: SERVICE (cont.) a) 120 volts ac for two wire 120 volt models, three CONTROL THERMOSTAT wire 120/208 and 120/240 volt models. b) 200 to 240 volts ac for two wire 200 volt or 240 volt models. 6. Disconnect the brewer from the power source. If voltage is present as described, reinstall the capillary tube into the tank to the line 4.5" above the bulb, the control thermostat is operating properly. If voltage is not present as described, replace the thermo
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SERVICE (cont.) If continuity is present as described, reconnect the ON/OFF SWITCH black wire to the center terminal and the white/red to the lower terminal. If continuity is not present as described, replace the switch. Removal and Replacement: 1. Remove the wires from the switch terminals. 2. Compress the clips inside the hood and gently push the switch through the opening. 3. Push the new switch into the opening and spread the clips to hold switch in the hood. 4. Refer to Fig. 7 when reconnec
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SERVICE (cont.) Removal and Replacement TANK HEATER 1. Shut off water supply to the brewer. 2. Disconnect the water supply tubes on the tank lid for the tank and the faucet coil assembly. 3. Disconnect the blue/black wire from the limit ther- mostat to the control thermostat. 4. Disconnect the black wire and the white or red wire from the tank heater terminals. 5. Remove sprayhead and the hex nut securing the sprayhead tube to the hood. Set aside for reas- sembly. 6. Remove the eight #8-32 nuts
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