Bunn ES.1A User Manual
BUNNEspress
ESPRESSO/CAPPUCCINO
COFFEE BREWER
TM
TM
ES•1A
ES•1A
OPERATING & SERVICE MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
P-176
10712.0000A 7/93 ©1993 Bunn-O-Matic Corporation
BUNN Espress™ Model ES•1A™
INDEX
Warranty..............................................................2
User notices ........................................................3
Features.......................................................... 4-9
Installation.........................................................10
Initial setup/use .................................................11
Programming ....................................................12
Cleaning............................................................13
Trouble-shooting ......................................... 14-15
Schematic-plumbing .........................................16
Schematic-electrical..........................................17
Replacement parts...................................... 18-25
Frequency of cartridge change ................... 26-28
1
BUNN Espress™ Model ES•1A™
WARRANTY
BUNN-O-MATIC COMMERCIAL PRODUCT 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) 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 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™ Model ES•1A™
The notices on this brewer should be kept in good condition. Replace unreadable or damaged labels.
USER NOTICES
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
WARNING
HAZARDOUS
VOLTAGE
CAUTION
HOT
Liquid-Steam-Surfaces
24246.0000
NOTICE
160 psig max operating pressure
UNPLUG BREWER
BEFORE REMOVING!
12652.0000
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
!
WARNING
24247.0000
READ THE ENTIRE OPERATING MANUAL
BEFORE BUYING OR USING THIS PRODUCT
THIS APPLIANCE IS HEATED WHENEVER
CONNECTED TO A POWER SOURCE
00831.0000F 3/98 © 1988 BUNN-O-MATIC CORPORATION
00831.0000
3
BUNN Espress™ Model ES•1A™
FEATURES
Hot water rinse dispensing tube and steam dispensing tube
The ES•1A™ is equipped with a hot water rinse dispensing tube and a steam dispensing tube. They are
operated by moving the levers located at the bottom of the machine from to side-to-side; they can be placed
in a continuously open position if required. The outlet tubes can also be rotated.
STEAM
HOT WATER RINSE
P-157
Boiler
The boiler is made of copper plating, 1.5 mm thick; it operates under a pressure between 1.1 to 1.3 bar
(16-18.8 psi). This is measured by means of a pressure gauge with a scale from 0 to 2 bar (0-29 psi). The
safety valve assures that boiler pressure never exceeds the safety limits; it automatically discharges steam
when pressure inside the boiler exceeds 1.8 bar (26.1 psi). The water heating element is an electric resistance
unit controlled by a pressure switch. This switch automatically regulates the pressure of steam in the boiler.
The pressure switch will automatically shut off the heater when necessary.
Electrical pump
The electric pump incorporated in the machine is required to obtain optimum water pressure of 9 bar (130
psi) for espresso extraction. If water pressure from the tap exceeds 5 bar (73 psi), a pressure reducer should
be installed to avoid damaging the machine. If a pressure reducer is required, it should be installed in the water
inlet pipe just before the water conditioner or electric-pump.
4
BUNN Espress™ Model ES•1A™
FEA TURES
7
6
4
3
9
11
10
2
12
1
Group head (Espresso extraction chamber)
The group head-espresso extraction chamber is where the coffee infusion takes place. After extraction,
an electric pressure valve automatically discharges the accumulated pressure. When the coil (12) of the
electro-valve receives an electric current, causing the plunger (10) to move, thus closing the discharge valve
(2) and opening the water intake valve (9) allowing the water to pass towards the shower (4) through the
sprayer (3). This is when the brewing process (infusion) begins.
The bubbling effect is produced by an interchange between air, contained in a bubble formed in the
chamber, and water which progressively increases it’s pressure on that bubble. The mixture of air and water
produced then falls on coffee previously dampened by the infusion process. When the liquid extraction
process of the coffee is complete, excess pressure contained in the filter holder is then released through a
discharge valve (2). The atomizer (1) directs the water being discharged to the opening to avoid it’s splashing
outward.
Water softener
It is essential to install a water softener to prevent any calcium build up in the boiler and hydraulic circuit.
P-158
5
BUNN Espress™ Model ES•1A™
FEATURES
Chassis
The chassis of the ES•1A™ is made of painted steel and the work tray is stainless steel. To reach the
interior of the machine, proceed as follows:
• Remove the cup heater tray (1)
• Loosen the two screws (2) holding the side panel in place (2)
• Remove the side panel (3) by lifting it up carefully.
• By loosening the nut (4) that holds the control panel in position and by placing the front piece at a right
angle, access to the interior of the control panel is obtained.
• Finally, by removing the work tray (5) and the drainage tray (6), access is gained to all the elements
of the machine.
2
4
1
3
6
Technical features
Width......................... 400 mm(15.7 inches)
Height........................ 370 mm(14.5 inches)
Depth......................... 490 mm(19.3 inches)
Net weight ................. 30 kgs(66.12 lbs.)
Gross weight ............. 37 kgs(81.55 lbs.)
Hydraulic feed............3⁄8"-19 Straight pipe BSPP
5
P-159
Drainage .................... 25 mm (1.07 in)
Total brewer power.... 2000 W.
Electric feed...............120 V. Single phase
Consumption ............. 16.7 A.
Boiler capacity ........... 4.0 liters (1.05 gal)
6
BUNN Espress™ Model ES•1A™
FEATURES
8
7
6
5
4
Component identification
9
10
11
12
13
15
14
16
P-161
2
13
1 ..................Hot water rinse outlet control lever
2 ..................Steam outlet control lever
3 ..................Hand grip-filter container for coffee
4 ..................Work tray
5 ..................Steam outlet tube
6 ..................Hot water rinse outlet tube
7 ..................Pressure gauge pump/steam
8 ..................Group head espresso extraction chamber
9 ..................Cup-heater tray
10 ................Power light
11 ................Refill light
12 ................Automatic dosification selector panel
13 ................Continuous flow control button
14 ................Program/Run toggle switch
15 ................General ON/OFF switch
16 ................Drainage tray
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