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is no longer current.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

9
BUNN Espress™ Model ES•1A™
Central/Electronic unit
This component analyzes and controls all information received from the buttons and volumetric counter,
activating the different relays and thus causing the different electric valves and the electric pump to start
functioning.
The connections of the central unit, as shown on the diagrams, are divided into two parts. First of all, the
connections that are marked with a zero plus a number correspond to the power feed and to the output. The
connectionsthatare markedwithjust anumbercorrespond totheinputs andtotheoutputsof theinformation
comingto thecentral unit fromthe volumetriccounter, the electroniclevel orthe programming switch. There
is also a single connection with a flat wire for 10 conductors which corresponds to these connection with the
buttons.
FEATURES
F
2
F
1
F
2
Connection
to the
dose switch
013
07
010
06
05
1
2
3
14
5
7
05-06.....120v. feed
07 ..........Connection refill solenoid
010 ........Output for the group solenoid valve
013 ........Output for the electric pump
Fl ...........Feed fuse, electric pump
F2 ..........Feed fuse electric valves
F3 ..........Feed fuse for the central unit
1-2.........Output to the programming switch
3 ............Connection to ground
5 ............Feed output (-) volumetric counter (flowmeter)
7 ............Feed output (+) volumetric counter (flowmeter)
14 ..........Connection to the level probe

BUNN Espress™ Model ES•1A™
10
INSTALLATION
Placement and installation
Once the machine has been unpacked, it should be placed on a table or counter having sufficient space
for easy access to water, electricity and drainage per the following specifications.
• A water inlet pipe.
• An electric plug with ground wire.
• A drain pipe with minimum interior diameter of 35 mm.
1.... Three-way or two-way plug with ground wire.
2.... Pipe with a minimum internal diameter of 35mm (braided hose is provided).
3.... Water conditioner 3⁄8" flare
4.... Strainer assembly (part # 24744.0000)
Water installation
Pipesforwateranddrainageconnectionsarelocatedinthelowerfrontpartofthemachine. Toreachthem,
raise the work and drainage trays. Connect the corresponding pipes, which are packed with the machine in
the following way:
From the electric pump to the water conditioner, and from the conditioner to the tap inlet. In the event a
water purifier is not installed, the connection from the electric pump should be made directly to the tap outlet.
One end of the flexible drain pipe must be connected to the drainage cup section and the other end to the
general drain.
NOTE: Forcartapplications,unitwillfunctionwithpumpsuctionlinesuspendedintoacontainerofwater.
Be sure not to run the container dry, damage to the pump will occur.
Electrical installation
Be certain that the available voltage at the installation site is the same as that on the manufacturer’s data
plate. Thisplaqueislocatedontheleftsideofthemachine. Theelectricalconnectionshouldbemadedirectly
to a wall socket equipped with a ground wire using the plug provided.
P-160
2
3
1
4

11
BUNN Espress™ Model ES•1A™
Filling
1. Make sure power switch is OFF and water is connected and turned ON before plugging in.
NOTE - Plumbing must be connected to the brewer before proceeding.
2. Locate the ON/OFF switch knob. It is in the upper right corner of the front panel.
3. Rotate the knob to the "OFF" (farthest counterclockwise) position.
4. Plug-in the brewer.
5. Place the power switch in the “ON” position.
6. Rotate the ON/OFF Switch knob to the (farthest clockwise) position. This allows the tank to
fill with water without turning-on the heater.
7. The refill pilot light (lower indicator on the front panel) will glow and the tank will automatically fill with
water.
NOTE: Proceed as follows if the pump stops and the pilot light flashes during the fill procedure:
a. Locate the small toggle switch on the upper right side of the front panel
b. Carefully place the switch in the right position.
c. Press the one-short and two-short cup brew switches simultaneously, flashing light
will stop.
d. Place the toggle switch in the left position.
e. The filling pilot light will glow and the tank will continue to fill with water if required.
8. Water will continue to flow into the tank until full. Simply repeat steps a-e above if the pump stops
again.
9. When the tank stops filling and the lower pilot light stops flashing, rotate the general ON/OFF switch
knob to the "ON" (center) position.
10. Allow the water in the tank to heat to the proper temperature before using the brewer.
11. Press any of the automatic brewing buttons. This causes hot water to circulate and the warming of the
extraction chamber to begin.
INITIAL SETUP/USE
“OFF”
Coffee extraction
1. Place ground coffee in the filter holder, shake it level, and compress the bed of coffee with the tamper on
the grinder.
2. Cleantheedgeofthefilterholderwiththepalmofthehandbeforelockingitontotheset. Thiswillprevent
any coffee particles from imbedding themselves into the group head gasket.
3. Place the filter holder in the group head and twist it to the right until tight. Do not force the filter holder
excessively.
4. Pressanyoneofthefourdosificationbuttons(12)orthecontinuousdrawbutton(13)accordingtothedose
required.
5. Extraction ends automatically. If the continuous liquid dispensing button (13) was pressed, dispensing
canbestoppedbypressingonanyoneofthefivebuttons. Theautomaticliquidextractioncausedbyusing
one of the four dosification buttons (12) can be stopped by pressing any of the dosification buttons.
NOTE: Theautomatic selectionshaveregulated doses,thesecan besetbetween 0and500 cc
The machines leave the factory with regulators adjusted for the following approximate amounts:
One short coffee: 50 cc of water
One normal coffee: 100 cc of water
Two short coffees: 100 cc of water
Two normal coffees: 200 cc of water
It should be noted that these doses have been set without coffee in the filter holder. With coffee, the

BUNN Espress™ Model ES•1A™
12
PROGRAMMING
Programming dosifications
To change the factory set dosages, set the Program/Run toggle switch to the “Program” (right) position.
Dependingonthedosageyouwishtochange(1cupor2cups),fillthefilter-holderwiththeproperamount
of ground coffee and place in the group head infusion unit of the machine. Press the corresponding dosage
push-buttonand hold for approximately 3 seconds. The brew lightwillbe flashing. Once the desired amount
of coffee is achieved press any of the dosage push-buttons to save the new setting in memory. Return the
“Run/Program” switch lever to the “Run” (left) position.
NOTES:1. This operation must be repeated for each dosage you wish to reprogram.
2. The push-buttons which were not reprogrammed will continue using the previous dosage
sets.
3. The “Continuous dosage” is not programmable.
Pre-infusion programming
Pre-infusion causes a non-programmable amount of brew water to be injected into the bed of coffee at
the beginning of the brew cycle; thus wetting the coffee, this is followed by a short delay, followed by the
programmed amount of dispense.
In order to check whether or not the pre-infusion has been turned on, turn the programming switch (14)
to the “Program” (right) position. If the pilot lamp (F) comes on, pre-infusion is on. To eliminate the pre-
infusion,pressthecontinuousdosagebutton(E)untilthepilotlamp(F)turnsoff;thenreturntheprogramming
switch to the “Run” position.
F
P-162
BE
ACD
volumes are slightly less. Should different volumes be required, refer to (Programming dosifications)
Control panel
This panel is composed of five buttons (A, B, C, D, and E) and a pilot lamp (F). The buttons A, B, C and
Dcorrespondtotheselectionsoffourpossibledosifications. ButtonEisforcontinuousliquiddispensing;and
the (F) is the pilot light.

13
BUNN Espress™ Model ES•1A™
CLEANING
Cleaning
1. The use of a damp cloth rinsed in any mild, nonabrasive, liquid detergent is recommended for cleaning
all surfaces on Bunn-O-Matic equipment.
2. Clean the gasket that seals the filter & the group head, located under the group head. Ground coffee
buildup on this gasket will result in a bad seal of the filter holder, and will leak brewed coffee onto the
outside of the filter holder when brewing. This is why it is important to wipe excess coffee off of the rim
of the filter prior to insertion in the group head.
4. The drip tray is to be cleaned daily. Remove the grill and drip pan, wash them out thoroughly, and place
them back into the brewer.
5. The steam wand must be cleaned after each use. Wipe with a damp cloth immediately after use. At the
end of the day, run the steam wand for about 15 seconds to clean it out.
6. The group head is to be cleaned daily.
a. Unit needs to be heated to normal operating temperature. This provides very hot water that will do
the best cleaning.
b. Install the “No hole” filter basket into a filter holder (porta filter).
c. Put a teaspoon of any espresso cleaner or automatic dishwasher detergent into the “No hole” filter
basket.
d. Install the filter holder as if brewing espresso.
e. Press the continuous brew switch (does not pertain to semi-automatic units) to activate the brew
cycle.
f. Allow the cycle to run for about 20 seconds.
g. Press the continuous brew switch to stop the brew cycle.
h. Repeat Step 5 except only allow the brew cycle to run for 10 seconds each time.
i. RepeatStep6untilthewaterbeingdischargedisclear.Thismaybeviewedbynotingtheliquidthat’s
being discharged onto the drip tray.
j. Remove filter holder (porta filter) containing the “No hole” filter basket.
k. Rinse thoroughly by turning brew cycle on and off several times.
l. Repeat process for all groups.

BUNN Espress™ Model ES•1A™
14
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 1-800-637-8606.
• Inspection, testing, and repair of electrical equipment should be performed only by qualified service
personnel.
• Solenoidremoval requires interrupting the water supply to thevalve. Damage may result if solenoids are
energized for more than ten minutes without a supply of water.
• Theuseoftwowrenchesisrecommendedwheneverplumbingfittingsaretightenedorloosened.Thiswill
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 120 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.
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.
TROUBLESHOOTING
Problem
Equipment will not
operate
Brew cycle will not start
Pushing any of the
automatic batch buttons
results in only a short
flash of the brew light.
Will not brew. Continu-
ous brew works as well
as automatic refill.
Probable cause
No power or incorrect
voltage
Toggle switch (Master
on/off)
No water
Water strainer or water
conditioner
Dose sizes were set
with a defective flowme-
ter. The result was no
flow pulses reached the
electronic controller.
during the dose size
programming.
Remedy
Connect the brewer to the power
source. Check for proper voltages.
Check circuit breaker/fuse.
Must be in the on position. Pilot
lamp will light.
Check plumbing and shut off
valves.
Direction of flow arrows must be
pointing toward the brewer.
Remove the strainer and/or filter
cartridge of the water conditioner
and check for obstructions. Clear
or replace.
Replace flowmeter. Repair loose
connector in wiring between
flowmeter and electronic controller.

15
BUNN Espress™ Model ES•1A™
TROUBLESHOOTING
Probable cause
Solenoid valve
Pump
Solenoid valve
Limit thermostat(s)
Tank heater
Remedy
Check voltage at terminals. If voltage is
presentwhenthedoseswitchispressed,
disconnect power supply, remove wires
from coil terminals and check coil termi-
nal continuity. If there is continuity re-
place solenoid.
Whenstart switchis pressed,pump should
turn on immediately. If this dies not hap-
pen, 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 itself is locked up. 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.
Disconnectpowersupply,removeallwires
check across limit terminals for continuity.
Ifno continuity,replace limitthermostat(s).
Check tank heater terminals for correct
voltage. If voltage is present and machine
isnotheatingproperly, replacetankheater.
Problem
Brew cycle will not
start (cont.)
Water is not hot or
long recovery time.

BUNN Espress™ Model ES•1A™
16
56789
1
2
3
4
11 12
10
1 ........ Electric pump
2 ........ Check valve
3 ........ Refill solenoid
4 ........ Flowmeter
5 ........ Steam valve
6 ........ Hot water rinse valve
7 ........ Liquid level probe
8 ........ Pressure relief valve
9 ........ Pressure switch
10 ...... Pressure gauge (Pump/Steam)
11 ...... Compensation valve (anti-siphon)
12 ...... Group head espresso extraction chamber
SCHEMATIC-PLUMBING

17
BUNN Espress™ Model ES•1A™
SCHEMATIC WIRING DIAGRAM
ES•1A N
BLK
L1 GREEN
120 VOLTS AC
2 WIRE
SINGLE PHASE
60 HZ
CONTROL
SWITCH
ABCD
E
51234
H
8
BLKBLU
•
•
•
•
•
•
•
•
•
•
•
•
1
2
3
4
5
8
A
B
C
D
E
H
•
•
•
•
•
•
•
•
•
•
•
•
1
2
3
4
5
8
A
B
C
D
E
H
•
•
•
•
•
•
•
•
•
•
•
•
1
2
3
4
5
8
A
B
C
D
E
H
CONTROL SWITCH LOGIC TABLE
BLK WHI
BLK
LIMIT
THERMOSTAT LIMIT
THERMOSTAT
BLU TANK HEATERS SW
PRESSUREBLKBLK
ELECTRONIC
CONTROLLER
BLK
BLU
TAN
TAN
TAN
SOL
GROUP
SOL
REFILL
BLU
PUMP
BLU
BLU
BLU
WHI
BLU
BLU
GRY
GRN
GRN/YEL PROBE
BRN
METER
FLOW
GRN
RED
CONTROL &
INDICATOR PANEL
(RIBBON CABLE)
PROGRAM
SW
1785 @ 120V
TOTAL WATTS
SCHEMATIC-ELECTRICAL

BUNN Espress™ Model ES•1A™
18
Figure Description Part Number
1 ...... Drip tray guide (left) ........................23654.0000
2 ...... Pressure gauge ...............................24210.0000
3 ...... Pressure gauge mounting bracket...24212.0000
4 ...... Locating pin-lower side panel..........23648.0000
5 ...... Side panel (left) ...............................23669.0000
6 ...... Nut ..................................................23933.0000
7 ...... Outlet fitting.....................................23610.0000
8 ...... “U” clip ............................................23638.0000
9 ...... Center mtg. brkt., front panel ..........23652.0000
10 .... Screw ..............................................24004.0800
11 .... Cable clamp.....................................23635.0000
12 .... Top cup warmer panel.....................23658.0000
Figure Description Part Number
13 .... Back panel .......................................23656.0000
14 .... Side panel (right).............................23668.0000
15 .... Programming switch-toggle ............22816.0000
16 .... Base frame ......................................23667.0000
17 .... Machine frame chassis....................23660.0000
18 .... Chrome front panel..........................23659.0000
19 .... Drain cup.........................................23634.0000
20 .... Drip tray guide (right)......................23653.0000
21 .... Rubber foot .....................................23633.0000
22 .... Nut ..................................................24045.0101
23 .... Drip tray ..........................................23655.0001
24 .... Drip tray grate .................................23657.0000
913147 8 10 11 12
6
5
4
3
2
1
24 23 22 21 20 19
15
16
17
18 P-165
REPLACEMENT PARTS