Bunn ESPRESS ES2C User Manual

932.63 Kb

BUNNEspress ®

ES•2C

DISCONTINUED VERSION

 

 

UTIO

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CA T

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The information in this manual

is no longer current.

Espresso Brewer

OPERATING & SERVICE MANUAL

BUNN-O-MATIC CORPORATION

POST OFFICE BOX 3227

SPRINGFIELD, ILLINOIS 62708-3227

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

10837.0000C 6/96 ©1994 Bunn-O-Matic Corporation

BUNN Espress ®

GENERAL

ES•2C

User notices.........................................................................................................................

3

Site Requirements ...............................................................................................................

4

Installation ...........................................................................................................................

5

Operating Controls...............................................................................................................

6

Adjustments ........................................................................................................................

7

Operation .............................................................................................................................

8

Brewing tips ........................................................................................................................

9

Cleaning .............................................................................................................................

10

Alarms ...............................................................................................................................

11

Troubleshooting ................................................................................................................

12

Plumbing Diagram .............................................................................................................

16

Wiring Diagram .................................................................................................................

17

INTRODUCTION

This compact, easy-to-operate equipment produces consistently fine esspresso and related beverages with the push of a button. The brewer has two group heads, each selectable to deliver one of four different programmed amounts of beverage. It has two milk steam wands and a hot water wand. All of the critical functions of the brewer are electronically controlled.

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. 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) 5296601 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 one year warranty period and no charge for labor by a Bunn Authorized Service Representative during the one year 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.Bunn shall not 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.

2

BUNN Espress ®

USER NOTICES

ES•2C

The notices on this brewer should be kept in good condition. Replace unreadable or damaged labels.

00656.0000

00831.0000

CAUTION

HOT

Liquid-Steam-Surfaces

24246.0000

24247.0000

3

BUNN Espress ®

SITE REQUIREMENTS

ES•2C

PHYSICAL

The brewer is for indoor use only on a sturdy counter. It is 2612” (67 cm) wide,16” (40.5 cm) tall, and 1912” (49 cm) deep. The brewer weighs approximately 142 pounds (64.5 kg) when the water tank is filled.

PLUMBING

The brewer must be connected to a cold water source with operating pressure between 20 and 90 psi (1.5- 6.5 bar) from a 12” or larger supply line. Install a valve in the water line before the brewer. Install a regulator before the brewer when the pressure is greater than 100 psi (7 bar) to reduce it to 45-60 psi ( 3-4 bar). The enclosed water strainer and either of the two enclosed water inlet hose assemblies must be installed before the brewer.

NOTE-Only softened or demineralized water should ever be used in this espresso brewer to reduce the service problems caused by naturally occuring elements in your local water supply. A polyphosphate feeder is not recommended because it does not remove minerals.

NOTE-Bunn-O-Matic recommends 38” copper tubing for no more than 25 feet from the 12” water supply line. Bunn-O-Matic does not recommentd 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.

ELECTRICAL

The brewer is equipped with an attached cordset and requires a 2-wire, grounded mating receptacle rated 208-240 volts ac, 20 amp, single phase, 60 Hz. An electrician must properly install a NEMA L6-20R connector to the appropriate electrical service on an individual branch circuit to install this brewer.

CAUTION-The brewer must be properly grounded. A plumbing line will not provide an adequate ground.

4

BUNN Espress ®

INSTALLATION

ES•2C

PLUMBING

Install the brewer as indicated below

FROM

 

 

WATER

WATER STRAINER

INLET HOSE

SUPPLY

 

ASSY.

 

24682.0000

 

 

 

 

 

Adaptor

 

24684.0000

 

23820.0000

 

 

 

 

 

 

Strainer Assy.

 

 

 

Sealing Washer

 

 

 

 

 

From Water Treatment

 

BUNN

FLOW

90psigmaxoperatingpressure

BOMStrainer

 

24684.0000 Sealing Washer

24683.0000 Adapter

To Espresso Brewer

Inlet Hose

ELECTRICAL

CAUTION-The brewer must be disconnected from the power source until specified. Improper electrical installation will damage electronic components.

1.Using a voltmeter, check the voltage and color coding of each conductor at the electrical source.

2.When instructed to proceed, connect the brewer to the power source.

CAUTION-The brewer must be properly grounded. A plumbing line will not provide an adequate ground.

INITIAL FILL & HEAT

CAUTION-The brewer must be disconnected from the power source until specified. Improper electrical installation will damage electronic components. Plumbing must be connected to the brewer before proceeding.

1.Watch the tank water level gage and push the tank/boiler manual fill button. Hold the button until the water level is visible in the sight gage.

2.Connect the brewer to the power source.

3.Place the main power switch in the “ON” position. The automatic refill function of the electronic control system will engage at this time. The refill indicator will glow and the tank will automatically fill with water. This switch also initiates the heating of the water in the tank/boiler.

4.Press the continuous flow button on each of the group control panels just until water flows from the group heads. This will purge air from the lines and allow faster heating of the group heads.

5

BUNN Espress ®

OPERATING CONTROLS

ES•2C

 

1

.............. Tank/Boiler Manual Fill Button

 

2

.............. Pressure Gage

 

3

.............. Hot Water Wand

 

4

.............. Tank Water Level Gage

 

5

.............. Hot Water Wand Control Knob

 

6

.............. Espresso Group Head

 

7

.............. Cup Warmer Tray

 

8

.............. Steam Wand Control Knob

 

9

.............. Power Indicator Lamp

 

10

............ Main Power Switch

 

11

............ Steam Wand

 

 

12

............ Drip Tray

 

 

13

............ Drip Tray Grate

 

14

............ Filter Holder

 

 

15

............ Program Switch

 

16

............ Group Control Panel

 

A .............. One Half-Cup Selector

 

B .............. One Full-Cup Selector

 

C .............. Two Half-Cups Selector

 

D .............. Two Full-Cups Selector

 

E .............. Continuous Flow Button

 

F .............. Brew Indicator

 

 

6

 

 

 

BUNN Espress ®

ADJUSTMENTS

ES•2C

INFUSION

The brewer leaves the factory set to yield these approximate amounts of water:

 

One Half-Cup ...................

50 cc.

Two Half-Cups .................

100 cc.

One Full-Cup ....................

100 cc.

Two Full-Cups ..................

200 cc.

To change the factory set amounts:

1.Place the program switch in the “Program” (right) position. The brew indicators may glow (see preinfusion section below).

2.Place the desired amount of espresso grind coffee in the appropriate filter holder (1 or 2 cups). Lock the filter holder into the group head.

3.Place a measuring vessel beneath the filter holder dripouts. The amounts may be set from 0 to 500 cc.

4.Press and hold the desired selector button until water flows from the filter holder (approximately 3 seconds). The brew indicator will begin flashing.

5.Press any of the selector buttons when the desired amount of coffee is measured. This saves the new setting in memory only for the selection in step #4.

6.Repeat steps 2-5 for each amount selection you want to reset. Those not reset will retain their old settings.

7.Place the program switch in the “Run” (left) position.

NOTE - The continuous flow button is not programmable.

PREINFUSION

Preinfusion releases a small nonadjustable amount of water into the filter holder at the beginning of the brew cycle, wetting the coffee. This is followed by a short delay, then the programmed amount of infusion water. Preinfusion may be enabled or disabled on either or boths sides of the brewer.

To determine whether or not preinfusion is enabled, place the programming switch in the “Program” (right) position. If either brew indicator glows, preinfusion is enabled on that side.

To enable preinfusion on either side, press the continuous flow button of the desired side until the brew indicator glows .

To disable preinfusion on either side, press the continuous flow button of the desired side until the brew indicator goes out.

Place the program switch in the “Run” (left) position.

7

BUNN Espress ®

OPERATION

ES•2C

ESPRESSO BREWING

1.Determine the batch size to be made.

2.Place the desired amount of espresso grind coffee in the appropriate filter holder (1 or 2 cups), shake it gently to level the bed, and using a tamper, compress the coffee.

3.Clean all coffee particles from the edge of the filter holder.

3.Raise the prepared filter holder up into the desired group head and twist it to the right (counterclockwise) until tight. Do not use excessive force.

4.Press the appropriate batch selector button for the selection made in step #1. (The continuous flow button may also be used.)

5.Brewing stops automatically when the predetermind amount of water has been used. The flow may be stopped at any time by pressing one of the five dispensing buttons.

6.Rinse the filter holder after each use.

HOT WATER & STEAM

CAUTION - Water, steam, and wands are hot. Be very careful!

Rotate the the steam or hot water control knobs to the left (counterclockwise) to dispense steam or hot water from the associated wands.

Rotate the steam or hot water control knobs to the right (clockwise) to stop the flow of steam or hot water from the associated wands.

Wipe the wands with a damp cloth immediately after each use.

8

BUNN Espress ®

BREWING TIPS

ES•2C

GENERAL

Good espresso is identified by its taste, aroma, and the manner in which it is served. All of these elements can be improved-upon to serve your customers a better product.

BEAN SELECTION

The selection of a blend of coffee is a matter of personal choice. A blend with a high proportion of Central and/or South American beans results in a beverage with a soft and agreeable flavor. A blend with a high proportion of African, Arabian, or Indonesian beans results in a bevewrage with a stronger flavor.

BEAN STORAGE

Roasted beans begin to lose their flavor and aroma shortly after roasting. It is not advisable to keep large quantities of coffee beans. Roasted beans should always be stored in an airtight container in a cool, dry place to retain these qualities for as long as possible.

GRIND

Make sure the grinder is functioning properly and delivering the correct grind. Place a small amount of ground coffee in the palm of your hand and spread it out some. The particles should be small and for the most part, uniform in size. There should be almost no really large grains. If the grind doesn’t look right, try adjusting the grinder. The true test of the grind, though is when you brew.

GROUND COFFEE STORAGE

Do not store quantities of ground espresso coffee, even overnight. The use of freshly ground espresso coffee is always advisable for better flavor extraction and aroma.

ACCESSORIES & TOOLS

Keep a supply of serving cups warming on top of the brewer, even when not a busy time. This assures the customer a hot cup of espresso each time. The cups will draw heat from the beverage if they are too thick. Medium-sized cups improve the presentation of the served beverage by allowing a slight amount of turbulence in the cup as the espresso falls from the filter holder. The crema can then rise easily to the surface.

Store all mixing tools, ie: spoons, etc. in hot water so they will not draw the heat from the beverage.

CLEANLINESS

Keep all items used in the preparation of espresso and related beverages clean. It improves the presentation of the product served and it’s just a good sanitary practice.

9

BUNN Espress ®

CLEANING

ES•2C

FILTER HOLDER CLEANING

Bunn-O-Matic recommends daily cleaning for your espresso brewer using the following steps:

1.Place the one-cup basket into the filter holder.

2.Put a teaspoon of any granular espresso cleaner or automatic dish washing detergent (such as Cascade®) into the basket.

3.Lock the filter holder into the right group head. As if you were brewing espresso.

4.Press the right continuous flow button to begin the cleaning process. After about 20 seconds, press the button again to stop the flow of water.

5.Repeat step 4, six times. Decreasing the time to about ten-seconds for each cleaning process.

6.Remove the filter holder from the right group head.

7.Rinse the right group head thoroughly by repeating step 4 a few times without a filter holder installed.

8.Repeat steps 2 through 7 using the left group head.

9.Remove the basket and filter support wire from the filter holder.

10.Use a damp cloth rinsed in any mild, non-abrasive liquid detergent to wipe the inside and outside surfaces of the filter holder, basket, and support wire.

11.Rinse all parts in hot water and reassemble the filter holder.

NOTE: Your hands must be clean before reassembling the filter holder.

12.Repeat steps 2 through 11 with the two-cup filter basket.

EXTERIOR CLEANING

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.

10

BUNN Espress ®

ALARMS

ES•2C

ONE BREW INDICATOR FLASHING (EITHER SIDE)

This alarm flashes when either flow meter has not sent impulses to the electronic control unit for more than five seconds. All functions will stop and the lamp will begin to flash if brewing a programmed amount. Check the following:

A.Coffee ground too fine.

B.Obstruction in the group head (dirty screen, blocked orifices, etc.)

C.Flow meter and electrical connections.

D.Solenoid valve and electrical connections.

E.Pump not operating properly.

Turn the alarm off by attempting another programmed brew or by placing the program switch in the “Program” (right) position and simultaneously pressing the ‘two half-cup’ and ‘two full-cup’ selector buttons on the appropriate control panel. Place the program switch in the “Run” (left) position.

If the problem persists, the alarm will flash every time a programmed button is pressed.

BOTH BREW INDICATORS FLASHING

This alarm flashes when the boiler does not refill to the required level within 60 seconds. All functions except continuous brew will stop and the lamps will begin to flash if brewing a programmed amount. Check the following:

A.Level probe and electrical connections

B.Water connections and pressure loss

C.Solenoid valve and electrical connections.

Turn the alarm off by placing the program switch in the “Program” (right) position and simultaneously pressing the ‘one half-cup’ and ‘two half-cup’ selector buttons on the left control panel. Place the program switch in the “Run” (left) position, the boiler will resume refilling.

This alarm does not affect operations when using the continuous flow button.

NOTE - This alarm will flash when attempting to entirely fill the tank/boiler without using manual fill.

11

BUNN Espress ®

TROUBLESHOOTING

ES•2C

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 at (800) 637-8606.

Inspection, testing, and repair of electrical equipment should be performed only by qualified service personnel.

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.

All electronic components have 208-240 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 loose connection at a terminal or crimp.

WARNINGS

Exercise extreme caution when servicing electrical equipment.

Disconnect the brewer from the power source when servicing, except when specified.

Follow recommended service procedures.

Replace all protective shields and safety notices.

PROBLEM

PROBABLE CAUSE

REMEDY

Equipment will not operate

No power or incorrect voltage

 

Power switch

 

No water

Brew cycle will not start

Water treatment or strainer

Connect the brewer to the power source. Check for proper voltage.

Check circuit breaker/fuse.

Must be in the “ON” position. Power indicator will glow.

Check plumbing and shut off valves.

Direction of flow arrows must be pointing toward the brewer.

Remove the strainer and/or water softener and check for obstructions. Clear or replace.

12

BUNN Espress ®

TROUBLESHOOTING

ES•2C

PROBLEM

PROBABLE CAUSE

Will not brew when any of the

Flowmeter

batch buttons is pressed.

 

(Continuous brew works as

 

well as automatic refill.)

Solenoid valve

 

Pump

Water is not hot or long reSolenoid valve covery time.

Limit thermostat(s)

Tank heater

REMEDY

Check connections between the flowmeter and electronic control unit. Replace flowmeter.

Check voltage at terminals. If voltage is presentwhenthedoseswitchispressed, disconnect power supply, remove wires from coil terminals and check coil terminal continuity. If there is continuity replace solenoid.

When start switch is pressed, pump should turn on immediately. If this does not happen, check voltage at terminal block on the pump. If correct voltage is present, use a flat-blade screwdriver to turn the motor shaft on the rear end of the motor to see if the pump is locked. If the shaft does not turn, replace pump assembly.

Remove the solenoid valve and clear it of any obstructions. Rebuild or replace the valve if necessary.

Disconnect power supply , remove all wires check across limit terminals for continuity. If no continuity, replace limit thermostat(s).

Check tank heater terminals for correct voltage. If voltage is present and machine is not heating properly, replace tank heater.

13

BUNN Espress ®

TROUBLESHOOTING

ES•2C

PROBLEM

PROBABLE CAUSE

REMEDY

Short brew time(less than

Coffee ground too coarse

Check coffee grind

approximately 20 seconds per

 

 

half-cup). Weak coffee. No

Coffee not fresh

Use fresh coffee

crema.

Too little coffee used

Adjust amount to taste

 

 

Coffee not tamped into filter basket

Use tamper to press coffee into basket

Brewer does not reach oper-

 

 

ating pressure or does so very

 

 

slowly.

 

 

14

BUNN Espress ®

TROUBLESHOOTING

 

ES•2C

PROBLEM

PROBABLE CAUSE

REMEDY

 

problem

problem

problem

 

 

 

 

 

 

15

16

SET TO ~160 PSI

CHECK

PRESSURE

VALVE

RELIEF

 

 

 

VALVE

 

 

 

REFILL

SOLENOID

TO DRAIN

TO REFILL

CONTROL

PUMP W/ADJUSTABLE

PRESSURE RELIEF VALVE

SET TO ~150 PSI

B•

DUAL PRESSURE

 

CONTROL

 

 

GAUGE

S

 

 

P

T

 

 

U

 

 

E

 

 

M

 

 

A

 

 

P

 

 

M

 

 

 

 

 

COLD WATER FILL LINE

 

 

 

PRESSURE

 

PRESSURE

 

RELIEF VALVE

FLOWMETER

SWITCH

 

 

 

(~25 PSI POP-OFF)

 

 

MANUAL FILL

 

 

VALVE

 

 

 

(Normally Blocked)

 

 

STEAM

~ 18 PSI

TEMERATURE

~ 250 F¡

WATER TREATMENT

 

 

 

 

HEAT

 

 

 

 

EXCHANGER

110 WS

 

 

 

 

 

 

 

 

TUBE

 

 

 

 

 

 

FROM WATER

STEAM

FAUCET

STEAM

VALVE

VALVE

VALVE

SUPPLY VALVE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

COLD

 

 

 

 

 

 

WATER

TO STEAM WAND

TO HOT WATER

TO STEAM WAND

 

 

LEGEND

Cold Water

Brew Water

Steam

Hot Water (surrounding tank heater)

Components and Item Numbers

HOT WATER

 

GROUP HEAD

GROUP HEAD

 

 

 

 

 

 

 

 

 

 

 

 

FILTER

 

HOLDER

 

GROUP

 

SOLENOID

 

(3-WAY)

 

HOT WATER

 

BREW CHAMBER

BREW CHAMBER

VENT TO DRAIN

VENT TO DRAIN

TANK HEATER

 

FILTER

HOLDER

GROUP

SOLENOID (3-WAY)

® Espress BUNN

DIAGRAM PLUMBING

ES•2C

BUNN Espress ®

WIRING DIAGRAM

ES•2C

 

ES•2C

L2

L1

 

 

GREEN

 

 

 

ELECTRONIC

PROGRAM SWITCH

 

K1-N.O.

CONTROLLER

 

 

COIL

J9-1

 

 

 

 

 

A1

A2

J8-1

POWER IND

 

 

 

 

GROUP

 

7

8

 

 

 

 

 

SOL

 

 

 

 

GROUP

 

5

6

 

SOL

 

 

 

 

REFILL

 

3

4

 

 

 

 

SOL

 

 

 

 

PUMP

 

1

2

J7-1

F L O W

 

 

 

METER

REFILL

IND

 

 

 

POWER

 

F L O W

 

SWITCH

J6-1

 

 

 

METER

 

 

J5-1

 

 

LIMIT

 

 

 

THERMOSTAT

J4-1

 

TANK HEATER

 

 

 

J3-1

 

 

PRESSURE

 

 

SWITCH

J2-1

PROBE

CONTROL &

INDICATOR

 

 

PANEL

J1

 

CONTROL &

 

 

INDICATOR

 

(RIBBON CABLE)

PANEL

 

 

10839.0000A 10/94 © 1994 BUNN-O-MATIC CORPORATION

220 VOLTS AC

2 WIRE

SINGLE PHASE

60 HZ

17