Bunn | ESPRESS ES2C | Service manual | Bunn ESPRESS ES2C Service manual

BUNNEspress
®
ES•2C
™
DISCONTINUED VERSION
The information in this manual
is no longer current.
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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 261⁄2” (67 cm) wide,16” (40.5 cm) tall, and 191⁄2”
(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 (1.56.5 bar) from a 1⁄2” 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 3⁄8” copper tubing for no more than 25 feet from the 1⁄2” 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
INSTALLATION
BUNN Espress ®
ES•2C ™
PLUMBING
Install the brewer as indicated below
FROM
WATER
SUPPLY
WATER STRAINER
ASSY.
24682.0000
Adaptor
INLET HOSE
24684.0000
Sealing Washer
23820.0000
Strainer Assy.
24684.0000
Sealing Washer
24683.0000
Adapter
To Espresso Brewer
Inlet Hose
From Water Treatment
FLOW
BUNN
90 psig max operating pressure
BOM Strainer
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
Connect the brewer to the power source.
Check for proper voltage.
Check circuit breaker/fuse.
Power switch
Must be in the “ON” position.
Power indicator will glow.
No water
Check plumbing and shut off valves.
Water treatment or strainer
Direction of flow arrows must be
pointing toward the brewer.
Brew cycle will not start
Remove the strainer and/or water
softener and check for obstructions.
Clear or replace.
12
TROUBLESHOOTING
BUNN Espress ®
PROBLEM
PROBABLE CAUSE
ES•2C ™
REMEDY
Check connections between the
flowmeter and electronic control unit.
Replace flowmeter.
Will not brew when any of the Flowmeter
batch buttons is pressed.
(Continuous brew works as
well as automatic refill.)
Solenoid valve
Check voltage at terminals. If voltage is
present when the dose switch is pressed,
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.
Pump
Remove the solenoid valve and clear it
of any obstructions. Rebuild or replace
the valve if necessary.
Water is not hot or long re- Solenoid valve
covery time.
Disconnect power supply , remove all
wires check across limit terminals for
continuity. If no continuity, replace
limit thermostat(s).
Limit thermostat(s)
Check tank heater terminals for correct
voltage. If voltage is present and machine is not heating properly, replace
tank heater.
Tank heater
13
BUNN Espress ®
PROBLEM
TROUBLESHOOTING
PROBABLE CAUSE
Short brew time(less than Coffee ground too coarse
approximately 20 seconds per
half-cup). Weak coffee. No Coffee not fresh
crema.
Too little coffee used
Coffee not tamped into filter basket
Brewer does not reach operating pressure or does so very
slowly.
14
ES•2C ™
REMEDY
Check coffee grind
Use fresh coffee
Adjust amount to taste
Use tamper to press coffee into basket
BUNN Espress ®
TROUBLESHOOTING
PROBLEM
PROBABLE CAUSE
REMEDY
problem
problem
problem
15
ES•2C ™
16
REFILL
SOLENOID
W a t er C o
nditioning Systems
B•U•N•N
™
PUMP W/ADJUSTABLE
PRESSURE RELIEF VALVE
SET TO ~150 PSI
TO REFILL
CONTROL
TO DRAIN
PRESSURE
RELIEF
VALVE
COLD
WATER
TO STEAM WAND
STEAM
VALVE
STEAM
~ 18 PSI
TEMERATURE
~ 250 F¡
TO HOT WATER
FAUCET
STEAM
VALVE
PRESSURE
SWITCH
TO STEAM WAND
HEAT
EXCHANGER
TUBE
FLOWMETER
FAUCET
VALVE
PRESSURE
RELIEF VALVE
(~25 PSI POP-OFF)
COLD WATER FILL LINE
T
E
A
M
MANUAL FILL
VALVE
(Normally Blocked)
P
U
M
P
TO HEATER
CONTROL
TANK HEATER
GROUP
SOLENOID
(3-WAY)
BREW CHAMBER
VENT TO DRAIN
GROUP HEAD
Components and Item Numbers
Hot Water (surrounding tank heater)
Steam
Brew Water
FILTER
HOLDER
HOT WATER
BREW CHAMBER
VENT TO DRAIN
GROUP HEAD
HOT WATER
LEGEND
Cold Water
GROUP
SOLENOID
(3-WAY)
FILTER
HOLDER
PLUMBING DIAGRAM
FROM WATER
SUPPLY VALVE
WATER TREATMENT
110 WS
CHECK
VALVE
SET TO
~160 PSI
DUAL PRESSURE
GAUGE S
BUNN Espress ®
ES•2C ™
BUNN Espress ®
WIRING DIAGRAM
ES•2C
ES•2C ™
L2
L1
GREEN
ELECTRONIC
CONTROLLER
PROGRAM SWITCH
K1-N.O.
COIL
J9-1
A1 A2
POWER IND
J8-1
GROUP
SOL
GROUP
7
8
5
6
3
4
1
2
SOL
REFILL
SOL
PUMP
J7-1
J6-1
FLOW
METER
REFILL IND
POWER
SWITCH
FLOW
METER
J5-1
LIMIT
THERMOSTAT
TANK HEATER
J4-1
PRESSURE
SWITCH
J3-1
J2-1
CONTROL &
INDICATOR
PANEL
PROBE
J1
CONTROL &
INDICATOR
PANEL
(RIBBON CABLE)
10839.0000A 10/94 © 1994 BUNN-O-MATIC CORPORATION
17
220 VOLTS AC
2 WIRE
SINGLE PHASE
60 HZ
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