Bunn OL, RL with High Heat Warmer Owner's Manual

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OPERATING & SERVICE MANUAL

BUNN-O-MATIC CORPORATION

POST OFFICE BOX 3227

SPRINGFIELD, ILLINOIS 62708-3227

PHONE: (217) 529-6601 FAX: (217) 529-6644

CONTENTS

Introduction............................................................... 2

User Notices .............................................................. 3

Electrical Requirements............................................. 4

Plumbing Requirements ............................................ 4

Initial Set-Up..............................................................5

Operating Controls..................................................... 6

Coffee Brewing .......................................................... 7

Cleaning..................................................................... 7

Troubleshooting......................................................... 8

Service....................................................................... 12

Wiring Diagrams........................................................ 26

INTRODUCTION

This equipment will brew a half-gallon batch of coffee into an awaiting decanter at the press of a button. The OL has two and the RL has five warmers to keep the beverage at the right temperature, on the RL one of which is capable of heating water to boiling. The brewer 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 warrants electronic circuit and/or control boards to be commercially free from defects in material and

workmanship for two years from the date of installation.

2.) Bunn warrants the compressor on refrigeration equipment to be commercially free from defects in material

and workmanship for two years from the date of installation.

3.) Bunn warrants that the grinding burrs on coffee grinding equipment will grind coffee to meet original factory

screen sieve analysis for three years from date of installation or for 30,000 pounds of coffee, whichever comes first.

This warranty does not apply to any equipment, component or part that was not manufactured by Bunn or that, in Bunn’s judgement, has been affected by misuse, neglect, alteration, improper installation or operation, improper maintenance or repair, damage or casualty.

THE FOREGOING WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ANY OTHER WARRANTY, WRITTEN OR ORAL, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF EITHER MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. The agents, dealers or employees of Bunn are

not authorized to make modifications to this warranty or to make additional warranties that are binding on Bunn. Accordingly, statements by such individuals, whether oral or written, do not constitute warranties and should not be relied upon.

The Buyer shall give Bunn prompt notice of any claim to be made under this warranty by telephone at (217) 529-6601 or by writing to Post Office Box 3227, Springfield, Illinois, 62708-3227. If requested by Bunn, the Buyer shall ship the defective equipment prepaid to an authorized Bunn service location. If Bunn determines, in its sole discretion, that the equipment does not conform to the warranty, Bunn shall repair the equipment with no charge for parts during the warranty period and no charge for labor by a Bunn Authorized Service Representative during the warranty period. If Bunn determines that repair is not feasible, Bunn shall, at its sole option, replace the equipment or refund the purchase price for the equipment.

THE BUYER’S REMEDY AGAINST BUNN FOR THE BREACH OF ANY OBLIGATION ARISING OUT OF THE SALE OF THIS EQUIPMENT, WHETHER DERIVED FROM WARRANTY OR OTHERWISE, SHALL BE LIMITED, AS SPECIFIED HEREIN, TO REPAIR OR, AT BUNN’S SOLE OPTION, REPLACEMENT OR REFUND.

In no event shall Bunn be liable for any other damage or loss, including, but not limited to, lost profits, lost sales, loss of use of equipment, claims of Buyer’s customers, cost of capital, cost of down time, cost of substitute equipment, facilities or services, or any other special, incidental or consequential damages.

Page 2

10020 030800

USER NOTICES

Carefully read and follow all notices on the equipment and in this manual. They were written for your protection.

All notices on the equipment should be kept in good condition. Replace any unreadable or damaged labels.

00831.0000

!

WARNING

Fill water tank before turning -on thermostat or connecting appliance to power source. Use only on a properly protected circuit capable of the rated load.

Electrically ground the chassis. Follow national/local electrical codes.

Do not use near combustibles.

FAILURE TO COMPLY RISKS EQUIPMENT

DAMAGE, FIRE, OR SHOCK HAZARD

READ THE ENTIRE OPERATING MANUAL

BEFORE BUYING OR USING THIS PRODUCT

THIS APPLIANCE IS HEATED WHENEVER

CONNECTED TO A POWER SOURCE

00658.0000

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

Page 3

WARNING

!

HIGH HEAT WARMER

DO NOT BOIL DECANTER DRY

KEEP COMBUSTIBLES AWAY

FAILURE TO COMPLY RISKS

GLASS FAILURE/HOT LIQUID

BURNS AND FIRE HAZARD

00688.0000

10020 111598

ELECTRICAL REQUIREMENTS

200 OR 240V.A.C.

L1 BLACK

L2 RED

CAUTION - Do not connect the brewer to the power source until specified in Initial Set-Up.

WHITE

NEUTRAL L1 BLACK

120V.A.C.

MODELS OL15 & 20 require 2wire, grounded service rated 120 volts ac, 15 or 20 amp respectively, single phase, 60 Hz.

L2 RED

WHITE

NEUTRAL

L1 BLACK

120V.A.C.

208 or 240V.A.C.

120V.A.C.

MODELS OL35 & RL35 require 3-wire, grounded service rated 120/208 or 120/240 volts ac, 20 amp, single phase, 60 Hz.

Electrical Hook-Up

Model OL15 has an attached cordset. Models OL20, OL35, & RL35, proceed as follows:

CAUTION – Improper electrical installation will dam-

age 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 top panel and rotate the control ther-

mostat knob fully counterclockwise to the "OFF" position and replace the panel.

4. Remove the rear panel, feed the cord through

the strain relief, and connect it to the terminal block.

5. Connect the brewer to the power source and

verify the voltage at the terminal block before proceeding. Replace the rear panel.

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 Set-Up.

PLUMBING REQUIREMENTS

This brewer must be connected to a cold water system with operating pressure between 20 and 90 psi from a 1/2" or larger supply line. A shut-off valve should be installed in the line before the brewer. Install a regulator in the line when pressure is greater than 90 psi to reduce it to 50 psi. The water inlet fitting is 1/4" flare.

RED

MODELS OLA, RLA, OL35B & RL35B require 2-wire,

grounded service rated 240 volts ac or 200 volts ac, 20 amp single phase, 50 Hz.

NEUTRAL L1 BLACK

MODEL OL25B & RL25B

requires 2-wire, grounded service rated 100 volts ac, 20 amp single phase, 50 Hz.

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100V.A.C.

P1478

NOTE - Bunn-O-Matic recommends 1/4" copper tubing for installations of less than 25 feet and 3/8" for more than 25 feet from the 1/2" water supply line. A tight coil of copper tubing in the water line will facilitate moving the brewer to clean the counter top. BunnO-Matic does not recommend the use of a saddle valve to install the brewer. The size and shape of the hole made in the supply line by this type of device may restrict water flow.

This equipment must 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).

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10020 111598

PLUMBING REQUIREMENTS (Cont.) Plumbing Hook-Up

Model OL15 has an attached water strainer, proceed to step 2. Models OL20, OL35, & RL35, proceed as follows:

1. Remove the rear panel and bottom pan. Run the long piece of tubing from the strainer (supplied) under the brewer and attach it to the water inlet fitting on the bottom bracket. Reinstall the bottom pan and rear panel.

2. Flush the water line and securely attach it to the 1/4" flare fitting on the strainer.

3. Turn on the water supply.

INITIAL SETUP

CAUTION - The brewer must be disconnected from the power source throughout the initial setup, except when

specified in the instructions.

1. Remove the top panel.

2. Rotate the control thermostat knob fully counterclockwise to the "OFF" position and replace the panel.

3. Insert an empty funnel into the funnel rails.

4. Place a decanter containing a small amount of water on the warmer beneath the funnel.

5. Connect the brewer to the power source, place the On/Off brew station warmer switch the upper position, and momentarily press the start switch. Water will begin flowing into the tank. When water stops flowing into the tank, initiate a second and a third brew cycle. During this third brew cycle the tank will fill to its capacity and the excess will flow from the sprayhead, out of the funnel, and into the decanter.

NOTE - The On/Off brew station warmer switch must be in the upper position to initiate and complete a brew cycle.

6. Place the On/Off brew station warmer switch in the lower position.

7. Disconnect the brewer from the power source.

8. Remove the top panel.

9. Rotate the control thermostat knob fully clockwise to the "ON" position and replace the panel.

10. Connect the brewer to the power source and wait approximately twenty minutes for the water in the tank to heat to the proper temperature. Some water will drip from the funnel during this time; this is due to expansion and should not occur thereafter.

11. Place an empty decanter under the funnel.

12. Place the On/Off brew station warmer switch in the upper position and momentarily press the start switch. Empty the decanter after water has stopped flowing from the funnel.

13. Allow the water in the tank to reheat to the proper temperature.

14. Place an empty decanter on the warmer and press the start switch. Check the water volume in the decanter after water has stopped flowing from the funnel. It should be 64 ounces.

15. If not, disconnect the brewer from the power source and remove the top panel.

16. Add or remove washers to the float on the level switch as required. Adding washers increases the volume, removing washers decreases it. Replace the top panel, connect the brewer to the power source, start, and measure another brew cycle.

17. Repeat steps 13-16 until 64 oz water volume is achieved.

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10020 111598

OPERATING CONTROLS

A. On/Off Brew Station Warmer Switch

Placing the switch in the upper position supplies power to the brew station warmer and enables brewing. Placing the switch in the lower position cuts power to the brew station warmer and stops brewing. Stopping a brew cycle after it has been started will not stop the flow of water into the funnel until the tank syphons down to its proper level.

NOTE - The On/Off brew station warmer switch must be in the upper position to initiate and complete a brew cycle.

B. On/Off Brew Station Warmer Indicator Lamp

Glows whenever the On/Off brew station warmer switch is in the upper position showing that the warmer is on and that the automatic brew cycle can be started.

C. Start Switch

Starts a brew cycle when the On/Off brew station warmer switch is in the upper position.

MODEL OL

MODEL RL

D E

D. Upper Warmer Switch

Placing the switch in the upper position supplies power to the upper warmer . Placing the switch in the lower position cuts power to the upper warmer.

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. USED ON HIGH FLAME

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E. Upper Warmer Indicator Lamp

Glows whenever the upper warmer switch is in

the upper position showing that the warmer is on.

F. Left Rear Warmer Rotary Switch

Rotating the knob to the "ON" position supplies power to the left rear warmer. Rotating the knob to the "OFF" position cuts power to the left rear warmer.

G. Left Front Warmer Rotary Switch

A B C

P1712

Rotating the knob to the "ON" position supplies power to the left front warmer. Rotating the knob to the "OFF" position cuts power to the left front warmer .

H. Right Front Warmer Rotary Switch

Rotating the knob to the "ON" position supplies power to the right front warmer . Rotating the knob to the "OFF" position cuts power to the right front warmer .

P1713

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I. Right Rear Warmer Three Heat Rotary Switch

Rotating the knob to the "LO", "MED", or "HIGH" positions supply power to the right rear warmer . Rotating the knob to the "OFF" position cuts power to the right rear warmer . The “HIGH” position of this switch makes the warmer capable of boiling water.

Page 6

10020 111598

COFFEE BREWING

Start each brew cycle with an empty, clean, half-gallon decanter.

1. Insert a BUNN® filter into the funnel.

2. Pour the fresh coffee into the filter and level the bed of grounds by gently shaking.

3. Slide the funnel into the funnel rails.

4. Place the On/Off brew station warmer switch in the upper position.

5. Momentarily press the start switch.

6. When brewing is completed, simply discard the grounds and filter.

CLEANING

1. The use of a damp cloth rinsed in any mild, non-abrasive, liquid detergent is recommended for cleaning all surfaces on Bunn-O-Matic equipment.

2. Check and clean the sprayhead. The sprayhead holes must always remain open.

3. With the sprayhead removed, insert the deliming spring (provided) all the way into the sprayhead tube. When inserted properly, no mor e than two inches of spring should be visible. Saw back and forth five or six times.

NOTE - In hard water areas, this may need to be done daily . It will help prevent liming problems in the brewer and takes less than a minute.

Page 7

10020 111598

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 electric components have 120 volt ac voltage on their terminals. Shorting of terminals or the application

of external voltages may result in equipment failure.

• Intermittent operation of electronic equipment is unlikely. Component failure will normally be permanent. If an intermittent condition is encountered, the cause will likely be a switch contact or a loose connection at a terminal or crimp.

• Solenoid removal requires interrupting the water supply to the valve. Damage may result if solenoids are energized for more than ten minutes without a supply of water.

• The use of two wrenches is recommended whenever plumbing fittings are tightened or loosened. This will help to avoid twists and kinks in the tubing.

• Make certain that all plumbing connections are sealed and electrical connections tight and isolated.

• This brewer is heated at all times unless disconnected from the power source. Keep away from combustibles.

WARNING

• Exercise extreme caution when servicing electrical equipment.

• Disconnect the brewer from the power source when servicing, except when electrical tests are specified.

• Follow recommended service procedures

• Replace all protective shields or safety notices

Problem

Equipment will not operate.

Brew cycle will not start.

Probable Cause

1. No power or incorrect voltage

1. No water

2. Water Strainer

3. Water Level Switch and Overflow Safety Switch

Remedy

(A) Connect the brewer to the power source.

(B) Check the terminal block for the proper voltages.

(C) Check circuit breaker/fuse. Check plumbing and shut-off valves.

(A) Direction of flow arrow must be pointing towards brewer.

(B) Remove the strainer and check for obstructions. Clear or replace.

Refer to Service - Water Level Switch and Overflow Safety Switch for testing procedures. See page 25.

Page 8

10020 111598

TROUBLESHOOTING (cont.) Problem

Brew cycle will not start. (cont.)

Water flows into fill basin continuously (On/Off brew station warmer switch "OFF").

Water flows into fill basin continuously (On/Off brew station warmer switch "ON").

Probable Cause

4. On/Off Brew Station Warmer Switch

5. Start Switch

6. Relay

7. Solenoid Valve

1. Solenoid Valve

1. Start Switch

Remedy

Refer to Service - On/Off Brew Station Warmer Switch for testing procedures. See page 16.

Refer to Service - Start Switch for testing procedures. See page 19.

Refer to Service - Relay for testing procedures. See page 23.

Refer to Service - Solenoid Valve for testing procedures. See page 22.

Refer to Service - Start Switch for testing procedures. See page 19.

Water is not hot.

Decanter warmer is not hot.

1. Limit Thermostat

CAUTION

Do not eliminate or bypass limit thermostat. Use only B.O.M. replacement part #29329.1000

2. Control Thermostat

3. Tank Heater

1. Warmer Switches

Refer to Service - Limit Thermostat for testing procedures. See page 21.

Refer to Service - Control Thermostat for testing procedures. See page 13.

Refer to Service - Tank Heater for testing procedures. See page 24.

(A) The Warmer Switch(es) must be in the "ON" position for the warmer to operate.

(B) Refer to Service - Warmer Switch(es) for testing procedures. See pages 16,17, & 18.

2. Decanter Warmers

Page 9

Refer to Service - Warmers for testing procedures. See pages 14 & 15.

10020 111598

TROUBLESHOOTING (cont.)

Problem

Spitting or unusual steaming from sprayhead.

Warmer plates too hot, solenoid coil smoking, or water in tank heats excessively fast.

Probable Cause

1. Control Thermostat

2. Lime build-up

CAUTION

Tank and tank components should be delimed regularly depending on local water conditions. Excessive mineral build-up on stainless steel surfaces can initiate corrosive reactions resulting in serious leaks.

1. Brewer wired to wrong voltage

Remedy

Refer to Service - Control Thermostat for testing procedures. See page 13.

Inspect the tank assembly for excessive lime deposits. Delime as required.

Refer to Electrical Requirements Page 4.

Inconsistent beverage level in decanter.

Dripping from sprayhead.

1. Improper water pressure

2. Syphon system

1. Syphon system

Check the operating water pressure to the brewer. It must be between 20 and 90 psi.

Water should flow freely from the sprayhead and then stop abruptly. The brewer must be level from frontto-back to syphon properly.

2. Solenoid Valve

Page 10

Refer to Service - Solenoid Valve for testing procedures. See page 22.

10020 111598

TROUBLESHOOTING (cont.) Problem

Beverage overflows decanter.

Weak beverage.

Probable Cause

1. Beverage left in decanter

1. Type of paper filters

2. Coffee

3. Sprayhead

4. Funnel loading

Remedy

The brew cycle should be started only with an empty decanter under the funnel.

BUNN® paper filters should be used for proper extraction.

A sufficient quantity of fine or drip grind coffee should be used for proper extraction.

B.O.M. sprayhead #01082.0000 should be used to properly wet the bed of ground coffee in the funnel.

The BUNN® paper filter should be centered in the funnel and the bed of coffee leveled by gentle shaking.

Brewer is making unusual noises.

5. Water temperature

1. Solenoid Valve

2. Plumbing lines

3. Water supply

Place a funnel over an empty decanter on the warmer beneath the sprayhead. Place the On/Off brew station warmer switch in the upper position, press the start switch, and check the water temperature immediately below the sprayhead with an accurate thermometer . The reading should not be less than 195° F. Ad- just the control thermostat slightly clockwise to increase the water temperature.

The nut on top of the solenoid valve must be tight or it will vibrate during operation.

Plumbing lines should not rest on the counter top.

(A) The brewer must be connected to a cold water line.

Page 11

(B) Water pressure to the brewer must not be higher than 90 psi. Install a regulator if necessary to lower the working pressure to approximately 50 psi.

10020 111598