Bunn AFPO-3 SL, AFPO-2 SL, AFPO-3 User Manual 2
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SERVICE & REPAIR MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
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41093.0000B 06/12 ©2008 Bunn-O-Matic Corporation
BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY
Bunn-O-Matic Corp. (“BUNN”) warrants equipment manufactured by it as follows:
1) Airpots, thermal carafes, decanters, GPR servers, iced tea/coffee dispensers, MCP/MCA pod brewers thermal servers
and Thermofresh servers (mechanical and digital)- 1 year parts and 1 year labor.
2) All other equipment - 2 years parts and 1 year labor plus added warranties as specified below:
a) Electronic circuit and/or control boards - parts and labor for 3 years.
b) Compressors on refrigeration equipment - 5 years parts and 1 year labor.
c) Grinding burrs on coffee grinding equipment to grind coffee to meet original factory screen sieve analysis - parts
and labor for 4 years or 40,000 pounds of coffee, whichever comes first.
These warranty periods run from the date of installation BUNN warrants that the equipment manufactured by it will be
commercially free of defects in material and workmanship existing at the time of manufacture and appearing within the
applicable warranty period. This warranty does not apply to any equipment, component or part that was not manufactured
by BUNN or that, in BUNN’s judgment, has been affected by misuse, neglect, alteration, improper installation or operation,
improper maintenance or repair, non periodic cleaning and descaling, equipment failures related to poor water quality,
damage or casualty. In addition, the warranty does not apply to replacement of items subject to normal use including but
not limited to user replaceable parts such as seals and gaskets. This warranty is conditioned on the Buyer 1) giving 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; 2) if requested by BUNN, shipping the defective equipment prepaid to an
authorized BUNN service location; and 3) receiving prior authorization from BUNN that the defective equipment is under
warranty.
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.
If BUNN determines in its sole discretion that the equipment does not conform to the warranty, BUNN, at its exclusive option while the equipment is under warranty, shall either 1) provide at no charge replacement parts and/or labor (during the
applicable parts and labor warranty periods specified above) to repair the defective components, provided that this repair
is done by a BUNN Authorized Service Representative; or 2) shall 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, AT BUNN’S SOLE OPTION
AS SPECIFIED HEREIN, TO REPAIR, REPLACEMENT OR REFUND.
In no event shall BUNN 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.
392, AutoPOD, AXIOM, BrewLOGIC, BrewMETER, Brew Better Not Bitter, BrewWISE, BrewWIZARD, BUNN Espress, BUNN
Family Gourmet, BUNN Gourmet, BUNN Pour-O-Matic, BUNN, BUNN with the stylized red line, BUNNlink, Bunn-OMatic,
Bunn-O-Matic, BUNNserve, BUNNSERVE with the stylized wrench design, Cool Froth, DBC, Dr. Brew stylized Dr. design,
Dual, Easy Pour, EasyClear, EasyGard, FlavorGard, Gourmet Ice, Gourmet Juice, High Intensity, iMIX, Infusion Series, Intellisteam, My Café, Phase Brew, PowerLogic, Quality Beverage Equipment Worldwide, Respect Earth, Respect Earth with
the stylized leaf and coffee cherry design, Safety-Fresh, savemycoffee.com, Scale-Pro, Silver Series, Single, Smart Funnel,
Smart Hopper, SmartWAVE, Soft Heat, SplashGard, The Mark of Quality in Beverage Equipment Worldwide, ThermoFresh,
Titan, trifecta, Velocity Brew, A Partner You Can Count On, Air Brew, Air Infusion, Beverage Bar Creator, Beverage Profit
Calculator, Brew better, not bitter., BUNNSource, Coffee At Its Best, Cyclonic Heating System, Daypart, Digital Brewer
Control, Nothing Brews Like a BUNN, Pouring Profits, Signature Series, Tea At Its Best, The Horizontal Red Line, Ultra are
either trademarks or registered trademarks of Bunn-O-Matic Corporation.
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41093 030912
CONTENTS
User Notices ..............................................................................................................................3
Preventive Maintenance
Cleaning ..................................................................................................................................... 4
Adjustments ............................................................................................................................... 4
Operating Controls ..................................................................................................................... 6
Troubleshooting ......................................................................................................................... 7
Service ......................................................................................................................................9
Circuit Board ............................................................................................................................10
Fuse & Fuse Holder .................................................................................................................. 11
Main ON/OFF Switch ................................................................................................................ 12
Probe LOW/OFF/HIGH Switches ............................................................................................... 13
Pump (Flavor) Start Switches .................................................................................................. 14
Refill ON/OFF Switches ........................................................................................................... 15
Solenoid ................................................................................................................................... 16
Solenoid (Water) Start Switches .............................................................................................. 17
Test/Operate Switch ................................................................................................................. 18
Vacuum/Supply Pump Assembly ............................................................................................. 19
Vacuum Switches .................................................................................................................... 21
Piping Diagram ........................................................................................................................ 22
Wiring Diagrams ...................................................................................................................... 23
USER NOTICES
All notices on the equipment are written for your protection. All notices are to be kept in good condition. Replace
any unreadable or damaged labels.
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CLEANING
RECOMMENDED WEEKLY CLEANING:
This should be done in conjunction with the recommended weekly cleaning of your machine. The Hoppers must
be empty before starting.
1. Prepare a 1 gallon cleaning solution consisting of 1 gallon of hot water and a sanitizing cleaner which contains
3-5% chlorine based sanitizer. Mix per manufacturers instructions
2. Remove connectors from each concentrate container and place them directly into the cleaning solution.
3. Energize each refill station and allow the cleaning solution to pump through the system into the hoppers. The
cleaning procedure should remove the color stains from the tubing. If not, prepare another gallon of cleaning
solution and repeat.
4. After the cleaning solution has been pumped into the hoppers, rinse the cleaning solution container with hot
water.
5. Fill the cleaning solution container with hot water. Energize each refill station and rinse thoroughly. The amount
of clean hot rinse water should equal the amount of cleaning solution pumped through the system.
6. Empty the hoppers of your machine and follow the recommended cleaning instructions.
NOTE: The hoses should be checked monthly for deterioration, cracks and possible discoloration from some
concentrates. Replace the tubing when necessary.
MIX RATIO ADJUSTMENTS
1. Remove the top access panel.
2. Connect the test hose to the “WATER OUTPUT” to be adjusted.
3. Connect the provided hose (or other suitable water hose) to the “WATER INPUT”.
4. Ensure water regulator is set at 20 psi(137.9 kPa). Press the “TEST OUTPUT” switch and while water is
flowing from the test hose, check that the gauge reads 20.
5. Place a one-cup container under the test hose. Press the “TEST OUTPUT” switch, and carefully measure and
note the elapsed time from when water first flows form the test hose to when one cup of water has been
dispensed. Hoses and tubing should be primed and free of substantial air spaces and/or bubbles prior to
calibration.
6. Compare results with chart or formula below.
7. If the time observed is too short or long, turn the needle valve clockwise or counterclockwise, respectively,
a little at a time. Repeat from the preceding step until correct.
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MIX RATIO ADJUSTMENTS(cont.)
Mix ratio (water/flavor) Time for FLAVOR OUTPUT (1/2 cup) Time for WATER OUTPUT (1 cup)
1+1 assume 20 sec. or obtain time per note below 40 sec. or 2 times flavor output time
2+1 assume 20 sec. or obtain time per note below 20 sec. or equal to flavor output time
3+1 assume 20 sec. or obtain time per note below 13.3 sec. or 0.67 times flavor output time
4+1(see below) assume 20 sec. or obtain time per note below 10 sec. or 0.5 times flavor output time
5+1 assume 20 sec. or obtain time per note below 8 sec. or 0.4 times flavor output time
6+1 assume 20 sec. or obtain time per note below 6.7 sec. or 0.33 times flavor output time
NOTE: For a typical adjustment, the time for flavor output in the center column above is assumed to be 20
seconds. A more specific flavor pump output time may be obtained prior to adjustment of the needle valve.
To do so, connect the flavor to be tested to the “FLAVOR INPUT”, and the test hose to the corresponding
“FLAVOR OUTPUT” (make no connection to the “WATER INPUT”). With a one-cup container under the
test hose press the corresponding “TEST OUTPUT” switch, and carefully measure and note the elapsed
time from when the product first flows from the test hose to when one-half cup of the product has been
dispensed. This value may then be used in the formula below. Following flavor pump output measurement,
disconnect the flavor line from the “FLAVOR INPUT” and purge remaining product from the line.
Formula for setting mix ratio: To obtain the time for dispensing 1 cup of water, divide the time it
takes to dispense one-half cup of product by the first number in the mix ratio and then multiply
the result by two.
Example: W=2(F/X) Where W is the time it should take to dispense one cup of water, it took F
seconds (20 here) to dispense 1/2 cup of flavor concentrate, we desire a mix ratio X of 4+1 (X
will be the first number in the mix ratio, 4).
Therefore: W = 2/(20/4)
W = 2/5
W = 10 seconds
So if it took 20 seconds to dispense one-half cup of flavor concentrate, and a mix ratio of 4 to 1
is required, the needle valve should be adjusted to dispense 1 cup of water in 10 seconds.
NOTE: Hoses and tubing should be primed and free of substantial air spaces and/or bubbles prior
to calibration.
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NEEDLE VALVE
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41093 040408
INPUT
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A. MAIN POWER ON/OFF
The main power ON/OFF switch is located on the right of the front panel just above the power cord.
B. REFILL CIRCUIT ON/OFF
The refill circuit ON/OFF switches are located on the right of the front panel just above the main power switch.
These allow each circuit to operate independently.
C. TEST/OPERATE
The TEST/OPERATE switch is located inside the auto-fill
box just below the top access cover. For setting flow
rates and mix ratios for flavors, place the TEST/OPERATE switch in the “TEST” position. This allows the op-
D
erator to run the water and flavor lines for each circuit
depending on the requirements for the flavor recipe.
D. PROBE CONTROL BOX LOW/OFF/HIGH
On models equipped with a dual level probe, there is a
LOW/OFF/HIGH switch located at the probe control box
on the hopper. The “OFF” position allows the operator
to disable the probe for that hopper only. THE “LOW”
and “HIGH” positions allow the operator to select the
level of product desired for that hopper.
P1951
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41093 040408
TROUBLESHOOTING
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.
• Inspection,testing,andrepairofelectricalequipmentshouldbeperformedonlybyqualiedserviceperson-
nel.
• Allelectronic components have 120voltacandlowvoltagedcpotentialontheirterminals. Shorting of
terminals or the application of external voltages may result in board failure.
• Intermittentoperationofelectroniccircuitboardsisunlikely.Boardfailurewillnormallybepermanent.If
an intermittent condition is encountered, the cause will likely be a switch contact or a loose connection at a
terminal or crimp.
• Solenoidremovalrequiresinterruptingthewatersupplytothevalve.Damagemayresultifsolenoidsare
energized for more than ten minutes without a supply of water.
• Theuseoftwowrenchesisrecommendedwheneverplumbingttingsaretightenedorloosened.Thiswill
help to avoid twists and kinks in the tubing.
• Makecertainthatallplumbingconnectionsaresealedandelectricalconnectionstightandisolated.
• Keepawayfromcombustibles.
WARNING – • Exerciseextremecautionwhenservicingelectricalequipment.
• Unplugthedispenserwhenservicing,exceptwhenelectricaltestsarespecied.
• Followrecommendedserviceprocedures
• Replaceallprotectiveshieldsorsafetynotices
PROBLEM
Product will not dispense
PROBABLE CAUSE
1. No water
2. No power or incorrect voltage to
the dispenser
3. Signal cable unplugged
4. Hopper is full
5. Fuse and fuse holder
REMEDY
Water lines and valves to the dispenser must be open.
(A1) Check the outlet for 120 volts
on two wire 120 volt dispensers.
(A2) Check the outlet for 200 volts
or 240 volts ac for two wire 200 volt
or 240 volt dispensers.
(A3) Check the outlet for 230 volts
on two wire 230 volt dispensers.
(B) Check circuit breakers or fuses.
Signal cable must be plugged in.
Product must not be touching probes
to fill.
Refer to Service - Fuse and Fuse
Holder for test procedures. See
page 12
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41093 040408
TROUBLESHOOTING (cont.)
PROBLEM
PROBABLE CAUSE
REMEDY
Product will not dispense (cont.)
6. Main ON/OFF switch
7. Probe box LOW/OFF/HIGH switches
8. Circuit board
9. Vacuum switch
10. Vacuum/Supply pump
11. Pump (flavor) start switches
Refer to Service - Main ON/OFF
Switch for testing procedure. See
page 13
Refer to Service - Probe system.
See page 14
Refer to Service - Circuit Board for
testing procedures. See page 11
Refer to Service - Vacuum switch for
testing procedures. See page 22
Refer to Service - Vacuum/Supply
pump for testing procedures. See
page 20
Refer to Service - Pump (flavor)
start switches for test procedures.
See page 15
Incorrect mix ratio
1. No water
Water lines and valves to the dispenser must be open.
2. Needle valve
Refer to Setup - Mix Ratio Adjustments for adjustment. See page 5
3. Solenoids
Refer to Service - Solenoids for test
procedures. See page 17
Motor thermal cutout (motor stops
running)
1. Motor overheat
The thermal switch will reset, but
requires up to 30 minutes of cooling
time. See NOTE below
NOTE: This refill unit should not be used to initially fill the hopper. Running the motor for extended periods will
trip the thermal switch. The thermal switch will reset, but requires up to 30 minutes of cooling time.
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41093 040408
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