Bunn SRUA User Manual

1.67 Mb
Loading...

BUNN® SRUA

OPERATING & SERVICE MANUAL

BUNN-O-MATIC CORPORATION

POST OFFICE BOX 3227

SPRINGFIELD, ILLINOIS 62708-3227

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

10067.0003A 07/02 ©2002 Bunn-O-Matic Corporation

www.bunnomatic.com

INTRODUCTION

This brewer will brew a three gallon batch of coffee into the reservoir, which has its own dispensing faucet.The brewer also has a hot water faucet for allied beverage use. It is only for indoor use on a sturdy counter.

BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY

Bunn-O-Matic Corp. (“BUNN”) warrants equipment manufactured by it as follows:

1)All equipment other than as specified below: 2 years parts and 1 year labor.

2)Electronic circuit and/or control boards: parts and labor for 3 years.

3)Compressors on refrigeration equipment: 5 years parts and 1 year labor.

4)Grinding burrs on coffee grinding equipment to grind coffee to meet original factory screen sieve analysis: parts and labor for 3 years or 30,000 pounds of coffee, whichever comes first.

These warranty periods run from the date of installation BUNN warrants that the equipment manufactured by it will be commercially free of defects in material and workmanship existing at the time of manufacture and appearing within the applicable warranty period. This warranty does not apply to any equipment, component or part that was not manufactured by BUNN or that, in BUNN’s judgment, has been affected by misuse, neglect, alteration, improper installation or operation, improper maintenance or repair, damage or casualty. This warranty is conditioned on the Buyer 1) giving 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; 2) if requested by BUNN, shipping the defective equipment prepaid to an authorized BUNN service location; and 3) receiving prior authorization from BUNN that the defective equipment is under warranty.

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.

If BUNN determines in its sole discretion that the equipment does not conform to the warranty, BUNN, at its exclusive option while the equipment is under warranty, shall either 1) provide at no charge replacement parts and/ or labor (during the applicable parts and labor warranty periods specified above) to repair the defective components, provided that this repair is done by a BUNN Authorized Service Representative; or 2) shall 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, AT BUNN’S SOLE OPTION AS SPECIFIED HEREIN, TO REPAIR, 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

10067.3 070102

 

USER NOTICES

Carefully read and follow all notices on the brewer and in this manual. They were written for your protection. All notices on the brewer are to be kept in good condition. Replace any unreadable or damaged labels.

#00656.0000

#00831.0000

 

ATTENTION:TURN OFF WHEN UNATTENDED

 

#00878.0000

#10044.0000

 

#03408.0000

#12593.0000

 

#03409.0000

#12555.0000

#29299.0000

Page 3

10067.3 070102

 

ELECTRICAL REQUIREMENTS

CAUTION - The brewer must be disconnected from the power source until specified in Initial Set-Up.

L2 RED

 

 

 

 

 

 

 

 

 

 

 

 

 

230V

 

 

 

 

 

A.C.

 

 

 

 

 

L1 BLACK

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P1842

SRUA Models require 2-wire, grounded service rated 230 volts ac, 30 amp, single phase, 50 Hz. Proceed as follows:

ELECTRICAL INSTALLATION INSTRUCTIONS

CAUTION – Improper electrical installation can damage the equipment and injure the installer. The chassis must be properly grounded. Do not assume a plumbing line will provide an adequate ground.

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.Before electrically connecting the brewer, remove the left side panel from the hood and rotate the control thermostat knob fully clockwise to the "OFF" position. Keep this knob in the "OFF" position until performing the Initial Setup. Replace the side panel.

4.Remove the lower front panel and connect the proper electrical service to the terminal block.

5.Connect the brewer to the power source and verify the voltage at the terminal block before proceeding. Replace the lower front panel.

6.Disconnect the brewer from the power source. If plumbing has been hooked up, the brewer is ready for the

Initial Setup.

NOTE: A Schematic wiring diagram is included in this manual.

PLUMBING REQUIREMENTS

The brewer must be connected to a cold water system with operating pressure between 20 and 90 psi (138 and 621 kPa) 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 (621 kPa) to reduce it to 50 psi (345 kPa). The water inlet fitting is 3/8" flare.

NOTE - Bunn-O-Matic recommends 3/8" copper tubing for installations from the 1/2" water supply line. Bunn- O-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.

Page 4

10067.3 070102

 

PLUMBING REQUIREMENTS(cont.)

Plumbing Hook-up

1.Make certain the 3/8" female flare fittings on the short tube from the outlet of strainer (supplied) is securely attached to the male fitting at the bottom rear of the brewer.

2.Flush the water line and securely attach it to the 3/8" male flare fitting on the inlet of the strainer.

3.Turn on the water supply.

4.Inspect the connection for leaks.

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).

INITIAL SETUP

CAUTION - The brewer must be disconnected from the power source throughout the Initial Setup, except when specified in the instructions.

IMPORTANT: Brewer must be level and installed on a sturdy structure.

Electrician's and Plumber's Instructions are provided. These instructions should be carefully followed before proceeding with Initial Setup.

Be sure all electrical and plumbing connections are tight.

1.Disconnect the brewer from the power source.

2.Remove the left side panel from the hood and rotate the control thermostat knob fully counterclockwise to the "OFF" position. Replace the side panel.

3.Connect the brewer to the power source and place the lighted ON/OFF switch in the "ON" position. Water will flow into the tank and should automatically stop after approximately 15 minutes.

NOTE - The lighted ON/OFF switch must be in the "ON" position to automatically refill the tank. The switch should be in the "OFF" position whenever the brewer is left unattended.

4.Disconnect the brewer from the power source.

5.Remove the left side panel from the hood and rotate the control thermostat knob clockwise to the 5 o'clock position. Replace the side panel.

6.Connect the brewer to the power source and wait for the water in the tank to heat to the proper temperature. This will take approximately 1-2 hours, depending on the incoming water temperature. Some water will flow from the overflow tube during this time due to expansion. Draw off a 1/2 gallon decanter of water every 15 minutes during the initial heat-up to lessen the chance of hot water flow from this expansion.

7.Determine the water temperature by checking the water with a thermometer at the hot water faucet (red handle). The best brewing temperature is between 195˚(91˚C) and 200˚F(93˚C). The temperature may be increased by turning the thermostat knob clockwise and decreased by turning the knob counterclockwise.

8.When the desired temperature is attained, place the funnel support, funnel, and funnel cover on top of the coffee reservoir. Center the discharge of the water swing spout over the opening in the top of the funnel cover.

9.Place the lighted ON/OFF switch in the "ON" position and momentarily press and release the start switch. Water should flow from the swing spout into the funnel assembly.

10.Drain and measure the water from the reservoir when the flow of water from this initial cycle stops. If it is three gallons, proceed to step 12. If it is more or less than three gallons, proceed to step 11.

11.Adjust the brew timer as required. See Adjusting Brew Volumes. Repeat steps 9 & 10.

12.The brewer is now properly adjusted to brew coffee.

Page 5

10067.3 070102

 

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 support, funnel and funnel cover 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 and hold the START or BREW switch until you see three breaks in the water stream from the swing arm. Release the switch (Failure to release the switch within two seconds after the third break in the water stream causes the volume setting to be aborted and previous volume setting will remain in memory) and press it again one or more times. Each time the switch is pressed, two seconds are added to the brew time period. Allow the brew cycle to finish in order to verify that the desired volume has been achieved.

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 you see three breaks in the water stream from the swing arm. Release the switch. (Failure to release the switch within two seconds after the third break in the water stream causes the volume setting to be aborted and previous volume setting will remain in memory). Allow the brew cycle to finish in order to verify that the desired volume has been achieved.

2.Setting batch sizes. To set a batch volume, first check that the SET/LOCK switch is in the “SET” position on the circuit board. Press and hold the START or BREW switch until you see three breaks in the water stream from the swing arm, and then release the switch. (Failure to release the switch within two seconds after the third break in the water stream causes the volume setting to be aborted and previous volume setting will

remain in memory). View the level of the liquid being dispensed. When the desired level is reached, turn the ON/OFF switch to “OFF” (lower). The brewer remembers this volume and will continue to brew batches of this size until the volume setting procedure is repeated.

NOTE: When brewing coffee, batch volumes will decrease due to absorption by the coffee grounds. NOTE: HALF-BATCH AND FULL BATCH SETTINGS MUST EACH BE SET SEPARATELY

3.Setting programming disable feature. If it becomes necessary to prevent anyone from changing brew times once programmed, you can set the SET/LOCK switch to the “LOCK” position. This will prevent any programming until switch is once again placed in the “SET” position.

Page 6

10067.3 070102

 

COFFEE BREWING

1.Brew 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.

2.Insert a Bunn® filter in funnel and add desired amount of coffee.

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 to the "ON" position.(This switch must be in the "ON" position to start and complete a brewing cycle.)

5.Push and release "START" switch to start the brew cycle.

6.Water swing spout should not be moved as long as water is flowing into the funnel cover. When water stops flowing, it may then be moved for access to brewing funnel.

7.Remove funnel cover. Funnel should not be removed from urn until drip out of coffee has been completed.

8.To empty funnel, invert it over a waste container to dispose of filter and grounds. An additional flange is provided on the funnel to help make this step easier.

NOTE: Hot water may be drawn from the hot water faucet during a brew cycle. However, if a large amount of hot water is drawn off (over 1 gallon) operator should wait to do so between brewing cycles.

CLEANING

NOTE: Tank and tank components should be delimed regularly based on local water conditions. Excessive mineral build up on stainless steel surfaces can initiate corrosion reactions resulting in serious leaks,

1.Remove funnel, funnel lid and support. Under hot water, rinse away all coffee oils. Wipe with a clean damp cloth.

2.Drain coffee reservoir by opening coffee faucet. When empty, close faucet.

3.Cycle two or three inches of water into the coffee reservoir, adding a bucket of crushed ice to obtain a more desirable cleaning temperature, and scrub entire reservoir area.

4.Drain coffee reservoir and rinse. Use clean damp cloth to wipe reservoir.

5.Install coffee funnel support, funnel and funnel lid.

6.Remove the sight gauge cap, insert sight gauge cleaning brush into the sight gauge glass tube and clean.

7.To clean coffee faucet, remove the faucet handle from the faucet and faucet clean out cap. Clean faucet with

a faucet cleaning brush and wipe all parts with a damp cloth. Replace faucet seat cup periodically if badly stained or to stop faucet dripping. DO NOT CLEAN THE HOT WATER FAUCET.

8Reassemble the coffee faucet.

9. Wipe the entire outside surface of the machine with a clean damp cloth. Wipe dry. CAUTION - Surfaces of machine are hot.

FILTER HOLDER

1.A filter holder is supplied with each SRU coffee brewer. Its purpose is to keep the filters in their originally formed shape to properly fit the brewer funnel.

2.It is suggested that only one cluster of filters be placed in the holder at one time for best results.

3.Not using the filter holder may permit the filters to gradually widen out towards a flat shape, especially so if humidity is present. Once a filter has lost its upright side walls, it may tend to collapse inward when placed in the brewing funnel. If this happens the hot water spray may cause one side to fall inwards, letting coffee grounds flow over the edge of filter and into the brewed coffee. Proper use of the holder should prevent this problem.

Page 7

10067.3 070102

 

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 230 volt ac and low voltage dc potential on their terminals. Shorting of terminals or the application of external voltages may result in board failure.

Intermittent operation of electronic circuit boards is unlikely. Board 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. Keep away from combustibles.

WARNING – • Exercise extreme caution when servicing electrical equipment.

Unplug the brewer when servicing, except when electrical tests are specified.

Follow recommended service procedures

Replace all protective shields or safety notices

PROBLEM

PROBABLE CAUSE

Brew cycle will not start

1.

No water

 

2.

No power or incorrect voltage to

 

the brewer

3. Water level below pump housing. (Water level in the hot water gauge glass should be approximately half full).

4. Swing Arm Switch

5. ON/OFF Switch

REMEDY

Water lines and valves to the brewer must be open.

(A)Check the terminal block for 230 volts ac across the red and black terminals.

(B)Check fuse.

Be sure water shut-off valve is open and that the in-line filters or strainers are not blocking water flow.

Refer to Service - Swing Arm Switch for testing procedures. See page 25

Refer to Service - ON/OFF Switch for testing. See page 20

Page 8

10067.3 070102

 

TROUBLESHOOTING (cont.)

 

 

PROBLEM

PROBABLE CAUSE

Brew cycle will not start (cont.)

6.

Start Switch

 

7.

Timer

 

8. Pump

 

9.

Solenoid Valve

 

10. Strainer

Tank not filling

1.ON/OFF Switch (This switch must

 

be in the "ON" position for the refill

 

circuit to operate.

 

2. No water

REMEDY

Refer to Service - Start Switch for testing procedures. See page 24

Refer to Service - Timer for testing procedures. See page 28 or 29

Refer to Service - Pump for testing procedures. See page 21

Refer to Service - Solenoid Valve for testing procedures. See page 23

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

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

Refer to Service - ON/OFF Switch for testing procedures. See page 20

Be sure water shut-off is open and that in-line filters or strainers are not blocking water flow.

3.Solenoid Valve

4.Probe

5.Liquid Level Board

Refer to Service - Solenoid Valve for testing procedures. See page 23

Refer to Service - Probe for testing procedures. See page 18

Refer to Service - Liquid Level Board for testing procedures. See page 18

Page 9

10067.3 070102

 

TROUBLESHOOTING (cont.)

 

 

 

PROBLEM

PROBABLE CAUSE

REMEDY

Water running out of the overflow

1.

Brewer not level

Brewer must be level and installed

 

 

 

on a sturdy structure.

 

2.

Solenoid Valve

Refer to Service - Solenoid Valve

 

 

 

for testing procedures. See page

 

 

 

23

 

3.

Liquid Level Board

Refer to Service -Liquid Level

 

 

 

Board for testing procedures. See

 

 

 

page 18

 

4.

Probe

Water is not hot

1.

Limit Thermostat

CAUTION - Do not eliminate or bypass limit thermostat. Use only Bunn-O-Matic replacement part #29329.1000.

Refer to Service - Probe for testing procedures. See page 18

Refer to Service - Limit Thermostat for testing procedures. See page 17

 

2.

Control Thermostat

Refer to Service - Control Ther-

 

 

 

mostat for testing procedures. See

 

 

 

page 15

 

3.

Tank Heater

Refer to Service - Tank Heater for

 

 

 

testing procedures. See page 26

 

4.

Contactor

Refer to Service - Contactor for

 

 

 

testing procedures. See page 14

 

5.

Thermal fuses

Refer to Service - thermal fuses

 

 

 

for testing procedures. See page

 

 

 

27

Fuse Opening

1. Fuse

Refer to Service - Fuse for testing

 

 

 

procedures. See page 16

 

2.

Tank Heater

Refer to Service - Tank Heater for

 

testing procedures. See page 26

Page 10

10067.3 070102

 

+ 21 hidden pages