Bunn System III User Manual
BUNN
®
®
SYSTEM III
OPERATING & SERVICE MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
27362.0000B 9/00 ©1996 Bunn-O-Matic Corporation
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. In addition:
1.) Bunn warrants electronic circuit and/or control boards to be commercially free from defects in material and
workmanship for two years from the date of installation.
2.) Bunn warrants the compressor on refrigeration equipment to be commercially free from defects in material
and workmanship for two years from the date of installation.
3.) Bunn warrants that the grinding burrs on coffee grinding equipment will grind coffee to meet original factory
screen sieve analysis for three years from date of installation or for 30,000 pounds of coffee, whichever comes first.
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 warranty period and no charge for labor by a Bunn Authorized Service Representative during
the 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.
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.
Page 2
27362 092500
USER NOTICES
Carefully read and follow all notices in this manual and on the equipment. The notices on this brewer should
be kept in good condition. Replace any unreadable or damaged labels.
12364.0000
10044.0000
! WARNING
20201.5600
00656.0000
HOT WATER
00831.0000
03408.0000
03409.0000
Page 3
27362 092900
ELECTRICAL REQUIREMENTS
CAUTION - The brewer must be disconnected from the power source until specified in
L2RED
WHITE
NEUTRAL
BLACK
120V.A.C.
208 or 240V.A.C.
120V.A.C.
P1841
Requires 3-wire, grounded service rated 120/208 volts or 120/240
volts ac, 20 amp, single phase, 60
Hz.
L2 RED
L1 BLACK
"A" & "B" models require 2-wire,
grounded service rated 200 volts ac
or 240 volts ac, 20 amp, single phase,
50 Hz.
Initial Set-Up.
200 OR 240V.A.C.
P2185
Electrical Hook-Up
CAUTION – Improper electrical installation will damage electronic components.
1. An electrician must provide electrical service as specified.
2. Using a voltmeter, check the voltage and color coding of each conductor at the electrical source.
3. Remove the front panel beneath the sprayhead.
Models with digital brewer control assembly:
Place the tank heater toggle switch at the bottom left of the control assembly in the "OFF" position.
Models with electro/mechanical thermostats:
Rotate the control thermostat knob fully counterclockwise to the "OFF" position.
4. Feed the cord through the strain relief and connect it to the terminal block.
5. Connect the brewer to the power source and verify the voltage at the terminal block before proceeding. Replace
the front panel.
6. If plumbing is to be hooked up later be sure the brewer is disconnected from the power source. If plumbing
has been hooked up, the brewer is ready for
Initial Set-Up
.
PLUMBING REQUIREMENTS
This brewer must be connected to a cold water system with operating pressure between 20 (138) and 90 psi
(620 kPa) from a 1⁄2" or larger supply line. A shut-off valve should be installed in the line before the brewer. Install
a regulator in the line when pressure is greater than 90 psi (620 kPa) to reduce it to 50 psi (345 kPa). The water
inlet fitting is 3⁄8" flare.
NOTE – Bunn-O-Matic recommends 3⁄8" copper tubing for installations of less than 25 feet and 1/2" for more than
25 feet from the 1⁄2" water supply line. A tight coil of copper tubing in the water line will facilitate moving the brewer
to clean the countertop. Bunn-O-Matic does not recommend 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.
This equipment must 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).
Plumbing Hook-Up
1. Remove the 3⁄8" flare cap from the bulkhead fitting on the bottom of the brewer.
2. Flush the water line and securely attach it to the bulkhead fitting on the bottom of the brewer.
3. Turn on the water supply.
Page 4
27362 092900
INITIAL SET-UP
CAUTION – The brewer must be disconnected from the power source throughout the initial set-up, except when
specified in the instructions.
1. Remove the front panel beneath the sprayhead.
Models with digital brewer control assembly:
Place the tank heater toggle switch at the bottom left of the control assembly in the "OFF" position.
Models with electro/mechanical thermostats:
Rotate the control thermostat knob fully counterclockwise to the "OFF" position.
2. Connect the brewer to the power source. Water will begin flowing into the tank.
3. When water stops flowing into the tank, remove the front panel and proceed as directed.
Models with digital brewer control assembly:
Place the tank heater toggle switch at the bottom left of the control assembly in the "ON" position and replace
the front panel.
Models with electro/mechanical thermostats:
Rotate the control thermostat knob fully clockwise to the "ON" position and replace the front panel.
4. On 208V or 240V Models , wait approximately twenty-five minutes for the water in the tank to heat to the proper
temperature.
5. Place an empty server beneath the brew station. Place the Selector switch in the desired position, the ON/OFF
switch in the "ON" (upper) position and initiate a brew cycle. Each volume must be set individually.
6. Place the ON/OFF switch in the "OFF" (lower) position after water has stopped flowing from the funnel, and check
the water volume in the server. It should be 128 oz (1 gallon), 192 oz (1-1/2 gallon) or 256 oz (2 gallon).
7. (A) If not, adjust the brew timer as required. See
Service - Digital Brewer Control Board
for DBC Brewers. Allow the water to reheat, start, and measure another
brew cycle.
(B) If necessary adjust the needle valve to achieve water volume to be bypassed around the coffee filter in the
funnel.
NOTE: To increase the water bypass turn the needle valve counterclockwise, to decrease the water bypass turn
the needle valve clockwise. An adjustment to the needle valve will require a timer adjustment for desired
volume.
8. Repeat step 7 until the proper water volume is achieved.
9. The brewer is now ready for use in accordance with the coffee brewing instructions.
Adjusting Brew Volumes
for electro/mechanical brewers
.
See
ADJUSTING BREW VOLUMES
electro/mechanical brewers
CAUTION - Disconnect the power source from the brewer prior to the removal of any panel for the replacement
or adjustment of any component.
NOTE: Prior to setting or modifying batch sizes, check that the brewer is connected to water supply, the tank is
properly filled, and a funnel and server are in place.
1. Modifying batch sizes. To modify a batch volume, first check that the SET/LOCK switch is in the “SET”
position on the circuit board. Select the batch volume to be set. (1, 1-1/2, or 2 gallons)
NOTE: Each batch setting must be adjusted separately.
To increase a batch size. Press and hold the START or BREW switch until three clicks are heard. Release the
switch (Failure to release the switch within two seconds after the third click causes the volume setting to be
aborted and previous volume setting will remain in memory) and press it again one or more times. Each time
the switch is pressed, two seconds are added to the brew time period. Allow the brew cycle to finish in order
to verify that the desired volume has been achieved.
Page 5
27362 092900
ADJUSTING BREW VOLUMES (cont.)
To decrease a batch size. Press and release the START or BREW switch once for every two-second interval
to be removed from the total brew time period; then immediately press and hold down the START or BREW
switch until three clicks are heard. Release the switch. (Failure to release the switch within two seconds after
the third click causes the volume setting to be aborted and previous volume setting will remain in memory).
Allow the brew cycle to finish in order to verify that the desired volume has been achieved.
2. Setting batch sizes. To set a batch volume, first check that the SET/LOCK switch is in the "SET" position on
the circuit board. Press and hold the START or BREW switch until three distinct clicks are heard, and then
release the switch. (Failure to release the switch within two seconds after the third click causes the volume
setting to be aborted and previous volume setting will remain in memory). View the level of the liquid being
dispensed. When the desired level is reached, turn the ON/OFF switch to "OFF" (lower). The brewer remembers this volume and will continue to brew batches of this size until the volume setting procedure is repeated.
NOTE: When brewing coffee, batch volumes will decrease due to absorption by the coffee grounds.
3. Setting programming disable feature. If it becomes necessary to prevent anyone from changing brew times
once programmed, you can set the SET/LOCK switch to the "LOCK" position. This will prevent any programming to be done until switch is once again placed in the "SET" position.
OPERATING CONTROLS
BREW SELECTOR SWITCH
Placing the switch in the 1Gal, 1-1/2Gal or 2Gal position selects the amount of coffee to be brewed in
subsequent brew cycles. Repositioning this switch after a brew cycle has been initiated does not change the brew
batch in progress.
ON/0FF (Warmer) SWITCH
Placing the switch in the unlighted lower position cuts power to the brew station warmer and stops brewing.
Stopping a brew cycle after it has been started will not stop the flow of water from the funnel. Placing the switch
in the lighted upper position supplies power to the brew station warmer and enables the brew circuit.
START SWITCH
Momentarily pressing and releasing this switch starts a brew cycle when the ON/OFF switch is in the lighted
upper position.
NOTE – The ON/OFF switch must be in the lighted upper position to initiate and complete a brew cycle.
COFFEE BREWING
1. Select the desired batch size.
2. Insert a BUNN® filter into the funnel.
3. Pour the proper amount of fresh coffee into the filter and level the bed of grounds by gently shaking.
4. Slide the funnel into the funnel rails.
5. Place an empty server under the funnel.
6 Place the ON/OFF switch in the lighted upper position. Momentarily press and release the Start switch.
7. When brewing is complete, simply discard the grounds and filter.
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. Check and clean the sprayhead. The sprayhead holes must always remain open.
NOTE – In hard water areas, this may need to be done daily. It will help prevent liming problems in the brewer and
takes less than a minute.
Page 6
27362 092900
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, and repair of electrical equipment should be performed only by qualified service
personnel.
• All electronic components have 120 - 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 switch contact or
a loose connection at a terminal or crimp.
• 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 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. Keep away from combustibles.
WARNING
• Exercise extreme caution when servicing electrical equipment.
• Disconnect power source when servicing, except when electrical tests are specified.
• Follow recommended service procedures.
• Replace all protective shields or safety notices.
Problem
Equipment will not operate.
Brew cycle will not start.
Probable Cause
1. No power or incorrect voltage
1. No water
2. Water strainer/flow control (.500
GPM)
Remedy
(A1) Check the terminal block for
120 volts across the red and white
terminals and the black and white
terminals on 120/208 or 120/240
volt brewers.
(A2) Check the terminal block for
200 volts on "B Series" brewers or
240 volts on "A Series" brewers
across the red and black terminals.
(B) Check circuit breakers or fuses.
Check plumbing and shut-off valves
(A) Direction of flow arrow must be
pointing towards the right.
(B) Remove the strainer/flow
control and check for obstructions.
Clear or replace.
Page 7
27362 092996
TROUBLESHOOTING (cont.)
Problem
Brew cycle will not start (cont.)
Automatic refill will not operate
Probable Cause
3. ON/OFF switch
4. Start switch
5. Timer
6. Dispense Valve
7. Digital Brewer Control
1. No water
2. Water strainer/flow control (.500
GPM)
Remedy
Refer to
Service
- ON/OFF switch for
testing procedures. See page 28
Refer to
Service -
Start switch for
testing procedures. See page 32
Refer to
Service -
Timer for testing
procedures. See page 34 or 35
Refer to
Service -
Dispense valve for
testing procedures. See page 21
Refer to
Service
- Digital brewer
controls for testing procedures. See
page 22 step 4
Check plumbing and shut-off valves.
(A) Direction of flow arrow must be
pointing towards the right.
3. Limit thermostat (Electro/mechanical and Digital Brewer Control)
4. Overflow protection switch
5. (A) Level control board & level
probe. (Electro/mechanical)
(B) Digital Brewer Control Assembly (DBC)
(B) Remove the strainer/flow control and check for obstructions. Clear
or replace.
Refer to
Service
- Limit thermostat
for testing procedures. See page 27
Refer to
Service -
Overflow protection switch for testing procedures.
See page 29
Refer to
Service
- Level control board
for testing procedures. See page 25
Refer to
Service
- Digital brewer
control for testing procedures. See
page 22 step 2
Page 8
27362 092900
TROUBLESHOOTING (cont.)
Problem Probable Cause Remedy
Automatic refill will not operate
(cont.)
Beverage level will not adjust (Selector switch in any position)
Water flows into tank continuously
(ON/OFF Switch "OFF")
Water from tank is not hot
6. Solenoid Valve
1. Selector switch
1. (A) Level control board and level
probe (Electro/mechanical)
(B) Digital Brewer Control
2. Overflow protection switch
3. Solenoid valve
1. Limit thermostat
CAUTION - Do not eliminate or bypass limit thermostat. Use only
B.O.M. part #23717.0001
Refer to
Service
- Solenoid valve for
testing procedures. See page 30
Refer to
Service
- Selector switch for
testing procedures. See page 16
Refer to
Service
- Level control board
for testing procedures. See page 25
Refer to
Service
- Digital brewer
control for testing procedures. See
page 23 step 10
Refer to
Service
- Overflow protection switch for testing procedures.
See page 29
Refer to
Service
- Solenoid valve for
testing procedures. See page 30
Refer to
Service
-Limit thermostat
for testing procedures. See page 27
2. (A) Control Thermostat (Electro/
mechanical)
(B) Digital Brewer Control
3. Contactor (Electro/mechanical)
4. Tank heater
Refer to
Service
- Control thermostat for testing procedures. See page
20
Refer to
Service
- Digital brewer
control for testing procedure. See
page 22 step 3
Refer to
Service
- Contactor for test
procedures. See page 18
Refer to
Service
- Tank heater for
testing procedures. See page 33
Page 9
27362 092900
TROUBLESHOOTING (cont.)
Problem
Water from tank is not hot (cont.)
Server warmer is not hot.
Spitting or unusual steaming from
sprayhead or airvent.
Probable Cause
5. Triac assembly (DBC)
1. ON/OFF switch
2. Warmer element
1. (A) Control thermostat (Electro/
mechanical)
(B) Digital Brewer Control
2. Triac assembly (DBC)
Remedy
Refer to
Service
- Digital brewer control for testing procedures. See page
22
Refer to
Service
- ON/OFF switch for
testing procedures. See page 28
Refer to
Service
- Warmer element
for testing procedures. See page 37
Refer to
Service
- Control thermostat for testing procedures. See page
20
Refer to
Service
- Digital brewer control for testing procedures. See page
23 step 10
Refer to
Service
- Digital Brew Control for testing procedures. See page
22
Inconsistent beverage level in server.
3. Lime build-up
CAUTION - Tank and tank components should be delimed regularly
depending on local water conditions.
Excessive mineral build-up on stainless steel surfaces can initiate corrosive reactions resulting in serious
leaks.
1. Strainer/flow control (.500 GPM)
2. Improper water pressure
Inspect the tank assembly for excessive lime deposits. Delime as required.
(A) Direction of flow arrow must be
pointing towards the brewer.
(B) Remove the strainer/flow control and check for obstructions. Clear
or replace.
Check the operating water pressure
to the brewer. It must be between 20
(138) and 90 psi (620 kPa).
Page 10
27362 092900
TROUBLESHOOTING (cont.)
Problem Probable Cause
Inconsistent beverage level in server.
3. Dispense valve
(cont.)
Consistently high or low beverage
level in server.
1. (A) Time adjustment (Electro/
mechanical)
(B) DBC volume adjustment
Dripping from sprayhead.
Water overflows filter.
1. Dispense valve
1. Bypass valve (Electro/mechanical)
2. Type of paper filters
Remedy
Refer to
Service -
Dispense valve for
testing procedures. See page 21
Refer to
Service -
Brew Timer for
testing and adjustment procedures.
See pages 34 or 35
Refer to
Service
- Digital brewer
control for testing procedures. See
page 23 step 8
Refer to
Service
- Dispense valve
for testing procedures. See page 21
Refer to
Adjustments
on page 5 step
#7. For test procedures see page 15.
BUNN® paper filters should be used
for proper extraction.
Beverage overflows server.
Weak beverage.
3. No sprayhead
1. Beverage left in server
2. Timer adjustment
3. Dispense valve
1. Type of paper filters
2. Coffee
Check sprayhead
The brew cycle should be started
only with an empty server under the
funnel.
Refer to
Service
- Timer for testing
procedures. See page 34 or 35
Refer to
Service
- Dispense valve for
testing procedures. See page 21
®
BUNN
paper filters should be used
for proper extraction.
A sufficient quantity of fresh drip or
regular grind should be used for
proper extraction.
Page 11
27362 092900
TROUBLESHOOTING (cont.)
Problem
Weak beverage (cont.)
Probable Cause Remedy
3. Sprayhead
B.O.M. sprayhead #01082.0002
should be used to properly wet the
bed of ground coffee in the funnel.
4. Funnel loading
The BUNN® paper filter should be
centered in the funnel and the bed of
ground coffee leveled by gentle shaking.
5. Water temperature
Empty the server, remove its cover,
and place the server on the warmer.
Place empty funnel over the server
entrance, with ON/OFF switch in the
"ON" (upper) position press the start
switch and release it. Check the water temperature immediately below
the sprayhead with a thermometer.
The reading should not be less than
195˚F (91˚C).
Brewer is making unusual noises.
1. Solenoid (Inlet)
2. Plumbing lines
3. Water supply
4. Tank heater
5. Contactor
The nut on back of the solenoid must
be tight or it will vibrate during operation
Plumbing lines should not be resting on the counter top.
(A) The brewer must be connected
to a cold water line.
(B) Water pressure to the brewer
must not be higher than 90 psi (620
kPa). Install a regulator if necessary
to lower the working pressure to
approximately 50 psi (345 kPa).
Remove and clean lime off the tank
heater.
Check for low voltage.
Temperature on the DBC display
varies.
1. Digital brewer control
Page 12
Refer to
Service
- Digital brewer
control for testing procedures. See
page 22 step 6
27362 092900
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