Bunn Espress ES-1A Instruction and safety manual

BUNNEspress
TM
OPERATING & SERVICE MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: [phone] FAX: [phone]
10712.0000A 7/93 ©1993 Bunn-O-Matic Corporation
ES•1A
ES•1A
TM
ESPRESSO/CAPPUCCINO
COFFEEBREWER
P-176
DISCONTINUED VERSION
The information in this manual
is no longer current.

1
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

BUNN Espress™ Model ES•1A™
2
BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY
Bunn-O-MaticCorp.(“Bunn”)warrantstheequipmentmanufacturedbyittobecommerciallyfreefromdefectsinmaterial
andworkmanshipexistingatthetimeofmanufactureandappearingwithinoneyearfromthedateofinstallation. Thiswarranty
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.
THEFOREGOINGWARRANTYISEXCLUSIVEANDISINLIEUOFANYOTHERWARRANTY,WRITTENORORAL,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
warrantyortomakeadditionalwarrantiesthatarebindingonBunn. Accordingly,statementsbysuchindividuals,whetheroral
or written, do not constitute warranties and should not be relied upon.
TheBuyershallgiveBunnpromptnoticeofanyclaimtobemadeunderthiswarrantybytelephoneat(217)529-6601or
bywriting to Post Office Box 3227, Springfield, Illinois, 62708-3227. If requested by Bunn, the Buyer shall ship the defective
equipmentprepaidtoanauthorizedBunnservicelocation. IfBunndetermines,initssolediscretion,thattheequipmentdoes
notconformtothewarranty,Bunnshallrepairtheequipmentwithnochargeforpartsduringtheoneyearwarrantyperiodand
nochargeforlaborbyaBunnAuthorizedServiceRepresentativeduringtheoneyearwarrantyperiod. IfBunndeterminesthat
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. Bunnshall not be liablefor any other damageorloss,
including,butnotlimitedto,lostprofits,lostsales,lossofuseofequipment,claimsofBuyer’scustomers,costofcapital,cost
of down time, cost of substitute equipment, facilities or services, or any other special, incidental or consequential damages.
WARRANTY

3
BUNN Espress™ Model ES•1A™
WARNING
HAZARDOUS
VOLTAGE
UNPLUG BREWER
BEFORE REMOVING!
USER NOTICES
The notices on this brewer should be kept in good condition. Replace unreadable or damaged labels.
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
CAUTION
HOT
Liquid-Steam-Surfaces
NOTICE
160 psig max operating pressure
24246.0000
24247.0000
12652.0000
Fill water tank before turning -on
thermostat or connecting appliance
to power source.
Do not use near combustibles.
Follow national/local electrical codes.
Electrically ground the chassis.
Use only on a properly protected
circuit capable of the rated load.
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
00831.0000F 3/98 © 1988 BUNN-O-MATIC CORPORATION
WARNING
!
00831.0000

BUNN Espress™ Model ES•1A™
4
Hot water rinse dispensing tube and steam dispensing tube
TheES•1A™ is equipped with a hot waterrinse dispensing tube and a steam dispensing tube. Theyare
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.
BoilerThe 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
whenpressureinsidetheboilerexceeds1.8bar(26.1psi). Thewaterheatingelementisanelectricresistance
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
Theelectricpumpincorporatedinthemachineisrequiredtoobtainoptimumwaterpressureof9bar(130
psi)forespresso extraction. Ifwater pressurefromthetapexceeds 5bar (73psi),apressurereducer should
beinstalledtoavoiddamagingthemachine. Ifapressurereducerisrequired,itshouldbeinstalledinthewater
inlet pipe just before the water conditioner or electric-pump.
HOT WATER RINSE
STEAM
FEATURES
P-157

5
BUNN Espress™ Model ES•1A™
7
1
12
2
9
3
4
10
11
6
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-valvereceives an electriccurrent, causing the plunger(10) to move, thusclosing 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 whichprogressively increases it’spressure on thatbubble. The mixture ofair 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
dischargevalve(2). Theatomizer(1)directsthewaterbeingdischargedtotheopeningtoavoidit’ssplashing
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
FEATURES

BUNN Espress™ Model ES•1A™
6
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.
• Bylooseningthenut(4)thatholdsthecontrolpanelinpositionandbyplacingthefrontpieceataright
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.
5
6
1
4
Technical features
2
3
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"-19StraightpipeBSPP
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)
FEATURES
P-159

7
BUNN Espress™ Model ES•1A™
P-161
FEATURES
8
7
6
5
13
12
10
911
15
16
4213
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
14
Component identification

BUNN Espress™ Model ES•1A™
8
Warning alarm (visual only, not audible) on flow counter
This alarm goes off when impulses from the flow meter are not registered by the central control unit, or
whenaperiodinexcessoffivesecondslapsesbetweenimpulsesfromtheflowmeter. Ifthebrewerisrunning
(i.e.pilotlamponcontinually),brewerfunctionwillstopandthelampwillbegintoflash. Begintroubleshooting
by checking the following:
• Excessively fine grind of the coffee or excessive tamping.
• Any possible obstruction in the coffee outlet (dirty shower unit, blocked set injector, etc.).
• Electrical connections on the volumetric counter.
• Electric valve (group solenoid.
• Electrical connection on the electric valve.
• Possible breakdown in the electric pump.
In order to eliminate the alarm signal simply press any of the buttons; however, if the problem persists,
the alarm will reappear every time a programmed dose button is pressed. This alarm does not effect the
machine’s functioning in the continuous liquid drawing mode or automatic refill.
Warning alarm (visual only, not audible) on automatic refill
This alarm goes off when the water entering the boiler does not reach its required level within a
predetermined period of time. The time limit control prevents any over-filling from taking place. Once the
alarm goes off, all automatic batch buttons a well as auto matic refill will not function. If the alarm goes off,
check the following:
• Level probe.
• Connections of the level probe.
• Water entrance (possible blockage at input).
• Electric valve controlling the entrance of the water into the boiler.
This alarm does not impede the machine’s functioning in the continuous liquid drawing mode and is not
effected if the machine is disconnected from the water supply and reconnected.
NOTE: After the problem has been solved the alarm can be reset in the following way: move the
programmingswitch(14)totheprogrammingposition;simultaneouslypressthe“oneshort”and
“twoshort” buttons. Whenthealarmhasbeeneliminated, theswitchshould beturnedback into
the “run” position.
Thealarmwillmostlikelygooffwhenfillinganemptyornearlyemptyboiler(suchasintheevent
of repairs or setting up a new machine), it may happen more than once.
FEATURES