Bunn U3A, U3 User Manual
U3
U3A
OPERATING & SERVICE MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
To ensure you have the latest revision of the Operating Manual, or to view the Illustrated Parts
Catalog, Programming Manual, or Service Manual, please visit the Bunn-O-Matic website, at
www.bunn.com. This is absolutely FREE, and the quickest way to obtain the latest catalog and
manual updates. For Technical Service, contact Bunn-O-Matic Corporation at 1-800-286-6070.
10060.0000K 10/08 ©1984 Bunn-O-Matic Corporation
BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY
Bunn-O-Matic Corp. (“BUNN”) warrants equipment manufactured by it as follows:
1) All equipment other than as specified below: 2 years parts and 1 year labor.
2) Electronic circuit and/or control boards: parts and labor for 3 years.
3) Compressors on refrigeration equipment: 5 years parts and 1 year labor.
4) Grinding burrs on coffee grinding equipment to grind coffee to meet original factory screen sieve analysis:
parts and labor for 3 years or 30,000 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, damage or casualty. 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.
BrewWISE, BrewLOGIC, BrewWIZARD, BUNN Gourmet Ice, BUNN Pour-O-Matic, BUNN, Bunn-OMatic, Bunn-O-Matic,
BUNNlink, BUNNserve, BUNN Espress, DBC, Dr. Brew, Dual, EasyClear, EasyGard, Easy Pour, FlavorGard, Gourmet Ice,
Gourmet Juice, High Intensity, IMIX, Infusion Series, Quality Beverage Equipment Worldwide, The Mark of Quality in Beverage Equipment Worldwide, My Café, PowerLogic, Safety-Fresh, Scale-Pro, Single, Smart Funnel, Smart Hopper, SmartWAVE, Soft Heat, SplashGard, System III, ThermoFresh, 392, AutoPOD, AXIOM, Beverage Profit Calculator, Beverage
Bar Creator, BrewMETER, BUNNSERVE, BUNNsource, Coffee At Its Best, Cool Froth, Digital Brewer Control, Intellisteam,
Nothing Brews Like a BUNN, Pouring Profits, Pulse Wave, Signature Series, Silver Series, Smart Heat, Tea At Its Best, The
Horizontal Red Line, Titan, Ultra, are either trademarks or registered trademarks of Bunn-O-Matic Corporation.
Page 2
10060 100908
WARNING
Very Hot Water
Use With Care!
INTRODUCTION
WARNING
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
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 ©1998 BUNN-O-MATIC CORPORATION
SLOWLY
WARNING
REMOVE FUNNEL
WARNING
HOT
LIQUID
CAUTION
SURFACES
HOT
ATTENTION: TURN OFF WHEN UNATTENDED
This equipment must be installed to comply
with the International Plumbing Code of the
International Code Council and the Food
Code Manual of the Food and Drug Administration (FDA). For models installed outside
the U.S.A., comply with the applicable
Plumbing /Sanitation Code.
This brewer will brew a three gallon batch of coffee into each reservoir (one at a time). Each reservoir has
its own dispensing faucet(s).The brewer also has a hot water faucet(s) for allied beverage use. It is only for
indoor use on a sturdy counter where ambient temperature is in the range of 10-30°C (50-85°F). Brewer to be
installed at a location where it can be overseen by trained personnel.
USER NOTICES
Carefully read and follow all notices on the brewer and in this manual. They were written for your protection.
All notices on the brewer are to be kept in good condition. Replace any unreadable or damaged labels.
#00656.0000
#00831.0000
#12593.0000
#12555.0000
Page 3
#37881.0000
#03408.0000
#03409.0000
#00878.0000
#00824.0001
10060 011708
ELECTRICAL REQUIREMENTS
GREEN GREEN
GREEN GREEN
GREEN GREEN
CAUTION - The brewer must be disconnected from the power source until specified in Initial Set-Up.
L2 RED
WHITE
NEUTRAL
L1 BLACK
120V A.C.
120V A.C.
208 OR
240V A.C.
P1841
U3 & U38 requires 3-wire, grounded service rated
120/208 or 120/240 volts ac, U3-30 amp,U38-40 amp,
single phase, 60 Hz. Proceed as follows:
BLACK
L1
RED
L2
230V A.C.
P1842
RED
BLACK
BLUE
L2
L3
L1
208V OR 240V
380V OR 440V
208V OR 240V
380V OR 440V
208V OR 240V
380V OR 440V
P1843
U333 & U3833 requires 3-wire, grounded service
rated 240 volt ac, 35 amp or 440 volts ac, 30 amp for
U333,three phase, 60 Hz or 380 volts ac, 30 amp for
U3833, three phase, 50 Hz. Proceed as follows:
WHITE
(NEUTRAL)
RED
BLUE
BLACK
N
L2
L3
L1
P1844
L1, L2, L3, are the 3 phases
V1 = Phase to phase voltage,
between any 2 phases.
V2 = Phase to neutral voltage,
any phase to neutral.
SYSTEM
VOLTAGE V1 V2
208 208 120
240 240 139
380 380 220
440 440 254
U3A models require 2-wire, grounded service rated
230 volts ac, 30 amp, single phase, 50 Hz. Proceed
as follows:
ELECTRICAL INSTALLATION INSTRUCTIONS
NOTE: Electrical source should have a circuit breaker between the brewer and the main supply which breaks all
poles with a contact separation of at least 3 mm.
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. Before electrically connecting the brewer, remove the front cupola cover (some models have the thermostat
knob on the outside of the cover) and rotate the thermostat knob fully counterclockwise to the "OFF" position.
Keep this knob in the "OFF" position until performing the Initial Setup.
4. Electrical service is connected at the upper rear of the single service and scrambler brewers using a junction box. On double service brewers the rear decorative channel must be removed for access to the terminal
block.
5. Connect the brewer to the power source and verify the voltage at the terminal block before proceeding. Replace all panels.
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 Setup.
NOTE: Schematic wiring diagrams are included in this manual.
U3833 requires 4-wire, grounded service rated
380 volts ac or 440 volts ac, 30 amp, three phase, 50
Hz. Proceed as follows:
Page 4
10060 011708
CE REQUIREMENTS
• This appliance must be installed in locations where it can be overseen by trained personnel.
• For proper operation, this appliance must be installed where the temperature is between 5°C to 35°C.
• Appliance shall not be tilted more than 10° for safe operation.
• An electrician must provide electrical service as specied in conformance with all local and national codes.
• This appliance must not be cleaned by water jet.
• This appliance is not intended for use by persons (including children) with reduced physical, sensory or mental
capabilities, or lack of experience and knowledge, unless they have been given instructions concerning use of
this appliance by a person responsible for its safety.
• Children should be supervised to ensure they do not play with the appliance.
• If the power cord is ever damaged, it must be replaced by the manufacturer or authorized service personnel with
a special cord available from the manufacturer or its authorized service personnel in order to avoid a hazard.
PLUMBING REQUIREMENTS
These brewers 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 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 International Plumbing Code of the International
Code Council and the Food Code Manual of the Food and Drug Administration (FDA). For models
installed outside the U.S.A., you must comply with the applicable Plumbing/Sanitation Code for
your area.
INITIAL SETUP
CAUTION - The brewer must be disconnected from the power source throughout the initial setup, except when specified
in the instructions.
IMPORTANT: Brewer must be level and installed on a sturdy structure.
Electrician's and Plumber's Instructions are provided. These instructions should be carefully followed
before proceeding with initial setup.
Be sure all electrical and plumbing connections are tight.
1. Open manual fill valve located on the bottom of the brewer. Water should start filling the tank. When water is visible
in the hot water gauge glass (center spigot), close valve. Approximate time for filling manually is 3 minutes.
CAUTION: Never leave brewer unattended while manually filling tank.
2. Connect the brewer to the power source. Turn "ON/OFF" switch to the "ON" position. Water should finish filling tank
automatically.
NOTE: It is recommended that the "ON/OFF" switch be left in the "OFF" position at the end of the operating day or when
unattended for a long period of time.
3. Disconnect the brewer from the power source. Remove front cupola cover for access to thermostat knob and timer.
On some brewers the thermostat knob is located on the front of the cupola cover.
4. Turn the thermostat knob clockwise to an approximate 5 o'clock position. Allow 1-1/2 hours for water to heat. Time
will vary with incoming water temperature.
5. On initial warm-up, some water may flow thru the overflow spigot due to expansion of the cold water in the tank.
This will not recur during the use of the brewer and may be avoided on the initial warm-up by drawing off 1/2 gallon
decanters of water each 15 minutes till brewing temperature is reached.
Page 5
10060 102808
INITIAL SETUP (cont.)
6. Brewing cycles may be started whenever water temperature is correct. This condition is indicated by the dial
thermometer on front of the brewer. Whenever the pointer is in the green, brewer is ready for brewing. The
recommended brewing temperature is approximately 200° F (93°C). Water temperature may be increased by
turning thermostat knob clockwise, decreased by turning knob counterclockwise.
7. When desired temperature is reached, insert funnel support, funnel and funnel cover in position. Be sure
the water swing spout is over the center of the funnel cover, turn "ON/OFF" switch to the "ON" position, push
and release "START" and run a brew cycle of hot water only. At the end of this cycle, brewer will be ready for
checking timer adjustment.
8. The timer has been preset for a 4 minute cycle. This setting will deliver approximately 3 gallons of water per
brewing cycle. To increase or decrease amount of water, adjust the timer as required. See Adjusting Brew
Volumes.
9. Having determined final settings of the thermostat and the timer, replace front cupola cover. Brewer is now
ready for brewing coffee.
ADJUSTING BREW VOLUMES
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 support, funnel and funnel cover are in place.
1. Modifying batch sizes. To modify a batch volume, first check that the SET/LOCK switch is in the “SET” posi-
tion on the circuit board.
To increase a batch size. Press and hold the START or BREW switch until you see three breaks in the water
stream from the swing arm. Release the switch (Failure to release the switch within two seconds after the
third break in the water stream 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.
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 you see three breaks in the water stream from the swing arm. Release the switch. (Failure to
release the switch within two seconds after the third break in the water stream 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 you see three breaks in the water stream
from the swing arm, and then release the switch. (Failure to release the switch within two seconds after the
third break in the water stream 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.
NOTE: HALF-BATCH AND FULL BATCH SETTINGS MUST EACH BE SET SEPARATELY.
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.
Page 6
10060 080900
COFFEE BREWING
1. Brewing cycles may be started whenever water temperature is correct. This condition is indicated by the dial
thermometer on front of the brewer. Whenever the pointer is in the green, brewer is ready for brewing.
2. Insert Bunn® filter in funnel and add desired amount of coffee.
3. Level the bed of coffee and place funnel into the funnel support. Place funnel cover over the funnel and be
sure the water swing spout is over the center of the funnel cover.
4. Turn "ON/OFF" switch to the "ON" position.
5. Push and release "START" switch to start the brew cycle.
6. Water swing spout should not be moved as long as water is flowing into the funnel cover. When water stops
flowing, it may then be moved for access to brewing funnel.
7. Remove funnel cover. Funnel should not be removed from brewer until drip out of coffee has been com-
pleted.
8. To empty funnel, invert it over a waste container to dispose of filter and grounds. An additional flange is
provided on the funnel to help make this step easier.
NOTE: Hot water may be drawn from the hot water faucet during a brew cycle. However, if a large amount of
hot water is drawn off (over 1 gallon) operator should wait to do so between brewing cycles.
CLEANING
NOTE: Tanks and tank components should be delimed regularly based on local water conditions. Excessive
mineral build-up on stainless steel surfaces can initiate corrosion reactions resulting in serious leaks.
1. Remove both funnels, funnel lids and supports, under hot water, rinse away all coffee oils. Wipe with a clean
damp cloth.
2. Drain both coffee reservoirs by opening coffee faucets. When empty, close faucets.
3. Cycle two or three inches of water into each coffee reservoir and scrub entire reservoir area.
NOTE: The brewer must NOT be rinsed or cleaned by a water jet device.
4. Drain both coffee reservoirs and rinse. Use clean damp cloth to wipe both reservoirs.
5. Install both coffee funnel supports, funnels and funnel lids.
6. Remove the sight gauge cap, insert sight gauge cleaning brush into the sight gauge glass tube and clean.
7. To clean coffee faucets, remove the faucet handle from the faucet and faucet clean out cap. Clean faucet with
a faucet cleaning brush and wipe all parts with a damp cloth. Replace faucet seat cups periodically if badly
stained or to stop faucet dripping. DO NOT CLEAN THE HOT WATER FAUCET.
8 Reassemble the coffee faucets.
9. Wipe the entire outside surface of the machine with a clean damp cloth. Wipe dry.
FILTER HOLDER
1. A filter holder is supplied with each U3 coffee brewer. Its purpose is to keep the filters in their originally
formed shape to properly fit the brewer funnel.
2. It is suggested that only one cluster of filters be placed in the holder at one time for best results.
3. Not using the filter holder may permit the filters to gradually widen out towards a flat shape, especially so if
humidity is present. Once a filter has lost its upright side walls, it may tend to collapse inward when placed
in the brewing funnel. If this happens the hot water spray may cause one side to fall inwards, letting coffee
grounds flow over the edge of filter and into the brewed coffee. Proper use of the holder should prevent this
problem.
Page 7
10060 081106
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 qualied service personnel.
• 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.
• 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 ttings are tightened or loosened. This will
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. Keep away from combustibles.
WARNING – • Exercise extreme caution when servicing electrical equipment.
• Unplug the brewer when servicing, except when electrical tests are specied.
• Follow recommended service procedures
• Replace all protective shields or safety notices
PROBLEM
Brew cycle will not start
PROBABLE CAUSE
1. No water
2. No power or incorrect voltage to
the brewer
REMEDY
Water lines and valves to the brewer
must be open.
(A1) Check the terminal block for
120 volts ac across the red and white
terminals and the black and white
terminal on three wire 102/208 volt
or 120/240 volt models.
(A2) Check the terminal block for 208
volts ac, 230 volts ac or 240 volts
ac on "A Series" brewers across the
red and black terminals on two wire
single phase 208 volt, 230 volt and
240 volt models.
(A3) Check the terminal block for 208
volts ac, 240 volts ac, 380 volts ac
across the black and blue terminals,
the blue and red and the black and
red terminals on three wire three
phase 208 volt, 240 volt and 380
volt models.
Page 8
10060 031500
TROUBLESHOOTING (cont.)
PROBLEM
Brew cycle will not start (cont)
PROBABLE CAUSE
2. No power or incorrect voltage to
the brewer (cont)
3. Water level below pump housing.
(Water level in the hot water gauge
glass should be approximately half
full).
4. ON/OFF Switch
REMEDY
(A4) Check the terminal block for
440 volts ac across the black and
blue terminals, black and red terminals and the red and blue terminals
on four wire three phase 440 volt
models.
(B) Check circuit breakers or
fuses.
Be sure water shut-off valve is open
and that the in-line filters or strainers are not blocking water flow. (Do
not confuse water shut-off valve
with the manual fill and drain valve
underneath the brewer).
Refer to Service - ON/OFF Switch for
testing. See page 22
5. Start Switch
6. Relay
7. Timer
8. Pump
9. Solenoid Valve
10. Strainer
Refer to Service - Start Switches for
testing procedures. See page 29
Refer to Service - Relay for testing
procedures. See page 24
Refer to Service - Timer for testing
procedures. See page 31 or 33
Refer to Service - Pump for testing
procedures. See page 23
Refer to Service - Solenoid Valve for
testing procedures. See page 27
(A) Direction of flow arrow must be
pointing towards brewer.
(B) Remove the strainer and check
for obstructions. Clear or replace.
Brew cycle starts with brew lockout
relay engaged.
1. Relay
Page 9
Refer to Service - Relay for testing
procedures. See page 24
10060 080900
TROUBLESHOOTING (cont.)
PROBLEM
Tank not filling
PROBABLE CAUSE
1.ON/OFF Switch (This switch
must be in the "ON" position for
the refill circuit to operate.
2. No water
3. Solenoid Valve
4. Probe
5. Liquid Level Board
REMEDY
Refer to Service - ON/OFF Switch
for testing procedures. See page
22
Be sure water shut-off is open and
that in-line filters or strainers are
not blocking water flow. (Do not
confuse water shut-off valve with
the manual fill and drain valve
underneath brewer).
Refer to Service - Solenoid Valve
for testing procedures. See page
27
Refer to Service - Probe for testing
procedures. See page 20
Refer to Service - Liquid Level
Board for testing procedures. See
page 20
Water running out of the overflow
1.Brewer not level
2. Solenoid Valve
3. Liquid Level Board
4. Probe
5. Manual fill and drain valve underneath brewer open.
Brewer must be level and installed
on a sturdy structure.
Refer to Service - Solenoid Valve
for testing procedures. See page
27
Refer to Service -Liquid Level
Board for testing procedures. See
page 20
Refer to Service - Probe for testing
procedures. See page 20
Be sure valve is closed.
Page 10
10060 080900
TROUBLESHOOTING (cont.)
PROBLEM
Water not hot
Circuit breaker keeps tripping
PROBABLE CAUSE
1. Limit Thermostat
CAUTION - Do not eliminate or
bypass limit thermostat. Use only
Bunn-O-Matic replacement part
#29329.1000
2. Control Thermostat
3. Tank Heater(s)
4. Contactor
1. Circuit Breaker
REMEDY
Refer to Service - Limit Thermostat for testing procedures. See
page19
Refer to Service - Control Thermostat for testing procedures.
See page 17
Refer to Service - Tank Heater for
testing procedures. See page 30
Refer to Service - Contactor for
testing procedures. See page 15
Refer to Service - Circuit Breaker
for testing procedures. See page
14
Water keeps running from swing
spout
Inconsistent coffee yield
Funnels overflow
2. Tank Heater(s)
1. Timer
2. Start Switch
1. Timer
2. Solenoid Valve
3. Lime build-up in swing spout
and pump tubing.
1. Filters
Refer to Service - Tank Heater for
testing procedures. See page 30
Refer to Service - Timer for testing
procedures. See page 31 or 33
Refer to Service - Start Switch for
testing procedures. See page 29
Refer to Service - Timer for testing
procedures. See page 31 or 33
Refer to Service - Solenoid Valve
for testing procedures. See page
27
Remove swing spout and insert
deliming rod down into pump
tubing as far as possible.
Use Bunn® filters made for the
U3 brewer.
2. Hole in bottom of funnel obstructed.
Page 11
Remove obstruction.
10060 080900
TROUBLESHOOTING (cont.)
PROBLEM
Funnels overflow (cont.)
Coffee reservoir overflows
PROBABLE CAUSE
3. Pump - Flow Rate
4. Soft Water
1. Coffee reservoir not completely
empty befor a brew cycle was
started.
2. Timer
REMEDY
Check pump flow rate with a watch.
Pump flow rate should be approximately 24 ounces in 15 seconds.
Be sure pump assembly is free of
any obstructions.
When using a water softener, a
coarse grind of coffee may be
preferred. If required, a bypass
system is available as an optional
feature.
Be sure coffee reservoir is empty
before brew cycle is started.
Refer to Service -Timer for testing
procedures. See page 31 or 33
Brewer is making unusal noises
3. Pump - Flow Rate
1. Solenoid Valve
2. Plumbing lines
3. Water supply
Check pump flow rate with a watch.
Pump flow rate should be approximately 24 ounces in 15 seconds.
Be sure pump assembly is free of
any obstructions.
The nut on 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 exceed 90 psi (620 kPa).
Install a regulator if necessary to
lower the pressure to approximately 50 psi (345 kPa).
4. Tank Heater(s)
Page 12
Remove and clean lime off the tank
heater. See page 30
10060 080900
SERVICE
This section provides procedures for testing and
replacing various major components used in this
brewer should service become necessary. Refer to
Troubleshooting for assistance in determining the
cause of any problem.
WARNING - Inspection, testing, and repair of electrical equipment should be performed only by qualified
service personnel. The brewer should be unplugged
when servicing, except when electrical tests are required and the test procedure specifically states to
plug in the brewer.
COMPONENT ACCESS
WARNING - Disconnect the brewer from the power
source before the removal of any panel or the replacement of any component.
All components are accessible by the removal of
the swing spout, front cupola cover, rear cupola cover
and the cupola.
Contents
Circuit Breaker .....................................................14
Contactor ..............................................................15
Control Thermostat ...............................................17
Fuse and Fuse Holder ...........................................18
Limit Thermostat ................................................... 19
Liquid Level Board and Level Probe .................... 20
ON/OFF Switch ......................................................22
Pump ....................................................................23
Relay ................................................................... 24
Selector Switch (Half Batch) .................................26
Solenoid ...............................................................27
Start Switch (Brew) ...............................................29
Tank Heater(s) .......................................................30
Thermal Cut-off ................................................... 31
Timer (Early Models).............................................31
Digital Timer (Late Models) ................................... 33
Transformer ..........................................................35
Master ON/OFF Switch (Late Models) ................... 36
Wiring Diagrams ...................................... 37 thru 42
Disconnect the swing spout nut from the swing
spout base fitting. Remove swing spout.
Remove the four #8-32 screws, two on the front and
rear, securing front and rear cupola covers to the
cupola.
Slip cupola off of the component bracket.
FIG. 1 COMPONENT ACCESS
P1317.30
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