Bunn Coffee Maker DUAL Installation Manual
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OPERATING & SERVICE MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
27040.0000F 01/04 ©1996 Bunn-O-Matic Corporation
CAUTION:
WARMERS
AND
URFACES ARE HOT
S
www.bunnomatic.com
INTRODUCTION
This equipment will brew two half-gallon, gallon, or gallon and a half batches of coffee into awaiting servers
at the push of a button. The brewer is also equipped with a hot water faucet for allied beverage use and is designed
to interface with a BUNN® Grinder. The brewer is specifically designed for use with a BUNN® 1.5 GPR server. It
is only for indoor use on a sturdy counter or shelf.
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.
Page 2
27040 010804
USER NOTICES
The notices on this brewer should be kept in good condition. Replace unreadable or damaged labels.
00658.0000
00831.0000
20201.5600
00656.0000
12364.0000
ELECTRICAL REQUIREMENTS
CAUTION - The brewer must be disconnected from the power source until specified in
L2 RED
200 or 240V A.C.
L1 BLACK
L2 RED
WHITE
NEUTRAL
L1 BLACK
120V A.C.
208 or 240V A.C.
120V A.C.120V A.C.
Initial Set-Up.
Requires 2-wire, grounded
service rated 200 to 240
volts ac, 30 amp, single
phase 50 or 60 Hz.
Requires 3-wire, grounded
service rated 120/208 or 120/
240 volts ac, 30 amp, single
phase, 60 Hz.
27040 010804
Page 3
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 sprayheads.
Models with electronic control assemblies:
Place the tank heater switch at the top 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 and 90 psi (138
and 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 1⁄4" flare.
NOTE – Bunn-O-Matic recommends 1⁄4" copper tubing for installations of less than 25 feet and 3⁄8" 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. Flush the water line and securely attach it to the flare fitting on the strainer/flow control located on bottom of
brewer.
2. Turn on the water supply.
INITIAL SET-UP
CAUTION – The brewer must be disconnected from the power source throughout the initial set-up, except when
specified in the instructions.
NOTE: ECA Models Only -This brewer is equipped with a temperature sensor that indicates when to brew and, when
selected, locks-out the start of a brew cycle until the water has heated to the optimum brewing temperature.
1. Remove the front panel beneath the sprayhead.
Models with electronic control assemblies:
Place the tank heater switch at the top of the control assembly in the “OFF” position.
Replace the front panel.
Models with electro/mechanical thermostats:
Rotate the control thermostat knob fully counterclockwise to the “OFF” position.
Replace the front panel.
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:
Page 4
27040 032201
INITIAL SET-UP (cont.)
Models with electronic control assemblies:
Place the tank heater switch at the top 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. Wait approximately twenty minutes for the water in the tank to heat to the proper temperature.
5. Place an empty server beneath either brew station and the ON/OFF switch in the upper ("ON") position.
6. Triple-set Timers only: Place the brew station Selector switch in the 1
7. (A) Initiate a brew cycle; after water has stopped flowing from the funnel, place the ON/OFF switch in the lower
("OFF") position and check the water volume in the server. It should be 192 ounces (5.7 L) for 1 1/2 gallons.
If not, adjust the timer as required. Refer to
Adjusting Brew Volumes
NOTE: Each batch setting must be adjusted individually, if they are not correct. Volumes are as follows:
1 gallon - 128 ounces (3.8L)
.5 gallon - 64 ounces (1.9L)
(B) If necessary adjust the needle valve to achieve desired 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 of the needle valve will require a timer adjustment for volume. To
determine how many turns must be performed to achieve the desired volume, use the chart below.
1
⁄2 gallon position.
40
30
20
% BYPASS
10
REFERENCE CHART
MECHANICAL BYPASS WITH ADJUSTABLE NEEDLE VALVE
BYPASS PERCENTAGE VS NUMBER OF FULL TURNS FROM
MAXIMUM CLOCKWISE POSITION
SINGLE & DUAL BREWERS
0
012345678
NUMBER OF FULL TURNS
NOTE: The factory bypass is set at 20%
Page 5
27040 011904
INITIAL SET-UP (cont.)
8. Repeat step 7 until the proper water volume is achieved.
9. Repeat steps 5 through 8 for the remaining brew station.
10. The brewer is now ready for use in accordance with the coffee brewing instructions.
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 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.
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.
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 (Triple - set timer models only)
Placing the switch in the 1⁄2 Gal, 1 Gal, or 11⁄2 Gal 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/OFF 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.
GRINDER SELECTOR SWITCH
Pressing the right or left side of the switch selects the corresponding brew station.
NOTE – The On/Off switch must be in the lighted upper position to initiate and complete a brew cycle.
27040 011904
Page 6
INITIAL SET-UP (cont.)
COFFEE BREWING
1. Select the desired batch size.
®
2. Insert a BUNN
filter into the funnel.
3. Pour the proper amount of fresh ground 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 completed, simply discard the grounds and filter.
CLEANING
1. The use of a damp cloth rinsed in any mild, non-abrasive, 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 7
27040 011904
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 the brewer from the 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.
Probable Cause
1. No power or incorrect voltage.
1. No waterBrew cycle will not start.
2. Water strainer/flow control
(.750 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 brewer.
(B) Remove the strainer/flow control and check for obstructions. Clear
or replace.
Page 8
27040 041100
TROUBLESHOOTING (cont.)
Problem
Probable Cause
Remedy
Brew cycle will not start (cont.)
Automatic refill will not operate
3. ON/OFF switch
4. Start switch
5. Timer
6. Dispense Valve
7. Control Assembly (Electronic)
1. No water
2. Water strainer/flow control
(.750 GPM)
Refer to
Service
- ON/OFF switch for
testing procedures. See page 32
Refer to
Service -
Start switch for
testing procedures. See page 37
Refer to
Service -
Timer for testing
procedures. See page 39 or 42
Refer to
Service -
Dispense valve for
testing procedures. See page 22
Refer to
Service
- Control assembly
for testing procedures. See pages
23 thru 28
Check plumbing and shut-off valves.
(A) Direction of flow arrow must be
pointing towards brewer.
3. Solenoid Valve
4. Limit thermostat (Electro/
mechanical and Electronic)
5. Overflow protection switch
6. (A) Level control board & level
probe. (Electro/mechanical controlled)
(B) Electronic controls
(B) Remove the strainer/flow control and check for obstructions. Clear
or replace.
Refer to
Service
- Solenoid valve for
testing procedures. See page 36
Refer to
Service
- Limit thermostat
for testing procedures. See page 31
Refer to
Service -
Overflow protection switch for testing procedures.
See page 33
Refer to
Service
- Level control board
for testing procedures. See page 29
Refer to
Service
- Electronic controls for testing procedures. See page
23 thru 28
Page 9
27040 011904
TROUBLESHOOTING (cont.)
Problem
Probable Cause
Remedy
Beverage level will not adjust
(Selector switch in any position)
Water flows into tank continuously
.
Water flows into tank continuously
(ON/OFF switch "ON").
Water from tank is not hot
1. Brew Selector switch
1. Solenoid valve
2A. Level control board and level
probe (Electro/mechanical)
2B. Control assembly (Electronic)
1. Timer
2. Overflow protection switch
1. Limit thermostat
CAUTION - Do not eliminate or bypass limit thermostat. Use only replacement part #23717.0001
Refer to
Service
- Selector switch for
testing procedures. See page 16
Refer to
Service
- Solenoid valve for
testing procedures. See page 36
Refer to
Service
- Level control board
for test procedures. See page 29
Refer to
Service
- Control assembly
for testing procedures. See page 23
thru 28
Refer to
Service
- Timer for testing
procedures. See page 39 or 42
Refer to
Service
- Overflow protection switch for testing procedures.
See page 33
Refer to
Service
-Limit thermostat
for testing procedures. See page 31
2A. Control Thermostat (Electro/mechanical)
2B. Control assembly (Electronic)
3. Contactor (Brewers with Recovery Booster)
4. Tank heaters
5. Triac assembly (Electronic)
Refer to
Service
- Control Thermostat for testing procedures. See page
20
Refer to
Service
- Control assembly
for testing procedure. See page 23
thru 28
Refer to
Service
- Contactor for test-
ing procedures. See page 18
Refer to
Service
- Tank heaters for
testing procedures. See page 38
Refer to
Service
- Triac assembly for
testing procedures. See page 23 thru
28
Page 10
27040 011904
TROUBLESHOOTING (cont.)
Problem
Water from tank is not hot (cont.).
Server warmer is not hot.
Spitting or unusual steaming from
sprayhead or airvents.
Probable Cause
6. Relay (Brewers with Recovery
Booster)
1. ON/OFF switch
2. Warmer element
1A. Control thermostat (Electro/mechanical)
1B. Control assembly (Electronic)
2. Triac assembly (Electronic)
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.
Remedy
Refer to
Service
- Relay for testing
procedures. See page 34
Refer to
Service
- ON/OFF switch for
testing procedures. See page 32
Refer to
Service
- Warmer element
for testing procedures. See page 44
Refer to
Service
- Control thermostat for testing procedures. See page
20
Refer to
Service
- Control assembly
for testing procedures. See page 23
thru 28
Refer to
Service
- Triac assembly for
testing procedures. See page 23 thru
28
Inspect the tank assembly for excessive lime deposits. Delime as required.
Inconsistent beverage level in server.
1. Strainer/flow control (.750 GPM)
(A) Direction of flow arrow must be
pointing towards the brewer.
(B) Remove the strainer/flow control and check for obstructions. Clear
or replace.
2. Improper water pressure
Check operating water pressure to
the brewer. It must be between 20
and 90 psi (138 and 620 kPa) .
27040 011904
Page 11
TROUBLESHOOTING (cont.)
Problem
Inconsistent beverage level in
server (cont.).
Consistently high or low beverage
level in server.
Dripping from sprayhead.
Water overflows filter.
Probable Cause
3. Dispense valve
1. Timer adjustment
1. Dispense valve
1. Bypass valve
2. Needle Valve
3. Type of paper filters
Remedy
Refer to
Service -
Dispense valve for
testing procedures. See page 22
Adjust the timer as required to
achieve the recommended volume
for each brew cycle.
Refer to
Service
- Dispense valve
for testing procedures. See page 22
Refer to
Initial Set-Up
on page 5 step
#7. For test procedures see page 15
Refer to
Initial Set-Up
on Page 5
step #7
BUNN® paper filters should be used
for proper extraction.
Beverage overflows server.
Weak beverage.
4. 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.
Adjust the timer as required to
achieve the recommended volume
for each brew cycle.
Refer to
Service
- Timer for testing
procedures. See page 39 or 42
Refer to
Service
- Dispense valve for
testing procedures. See page 22
®
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 12
27040 011904
TROUBLESHOOTING (cont.)
Problem
Weak beverage (cont.)
Probable Cause
3. Sprayhead
4. Funnel loading
5. Water temperature
Remedy
A clean sprayhead should be used to
properly wet the bed of ground coffee in the funnel.
The BUNN® paper filter should be
centered in the funnel and the bed of
ground coffee leveled by gentle shaking.
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" 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 Heaters
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 tank heaters.
Check for low voltage
Page 13
27040 011904
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 - Unplug the brewer before the removal of
any panel or the replacement of any component.
All components are accessible by the removal of
the top cover, front inspection panel and warmer base
plate.
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The top cover is attached with four #4-40 slotted
head screws.
The front inspection panel is attached with five #6-
32 slotted head screws.
The warmer base is attached with four #6-32
slotted head screws.
Contents
Brewer Selector Switch......................................... 16
Bypass Valve ........................................................15
Contactor Assembly.............................................. 18
Control Thermostat............................................... 20
Dispense Valve ..................................................... 22
Electronic Control .................................... 23 thru 28
Grinder Selector Switch ........................................ 28
Level Control Board and Level Probe ....................29
Limit Thermostat .................................................. 31
ON/OFF Switch (Warmer) .....................................32
Overflow Protection Switch .................................. 33
Relay .................................................................... 34
Solenoid ...............................................................36
Start Switches (Brew) ...........................................37
Tank Heaters......................................................... 38
Timers (Early Models) .......................................... 39
Digital Timer (Late Models) .................................. 42
Warmer Elements .................................................44
Wiring Diagrams................................................... 45
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P772
27040 011904
Page 14
SERVICE (cont.)
BYPASS VALVE
gal
1
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P773
FIG. 1 BYPASS VALVES
Location:
The bypass valves are located inside the right front
and the center front of the hood.
Test Procedures:
1. Disconnect the brewer from the power source and
place a server beneath the funnel.
2. Check the water level in the tank to confirm that it
is within 1/2" from the top of the tank.
3. Connect the brewer to the power source.
4. Check the bypass valve for coil action. Place the
ON/OFF switch in the "ON" position, press and
release the BREW switch. Listen carefully in the
vicinity of the bypass valve for a "clicking" sound as
the coil magnet attracts and repels the plunger.
5. Disconnect the brewer from the power source.
6. Connect the voltmeter lead ends to the bypass
valve coil terminals. Connect the brewer to the
power source. With the selector switch in the 1 or
1-1/2 gallon position, place "ON/OFF" Switch in the
"ON" position. Press and release the brew switch.
The indication must be:
a.) 120 volts ac for three wire 120/208 volt and
three wire 120/240 volt models.
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models.
7. Disconnect the brewer from the power source.
If voltage is present as described, but no coil action is
observed, nor "clicking" heard, bypass valve is defective. Replace valve and test again to verify repair.
If voltage is not present as described, refer to
Diagrams
and check the brewer wiring harness. Also
Wiring
check the control board for proper operation. See
Pages 22 through 27.
Removal and Replacement:
1. Remove the wires from the bypass valve.
2. Drain enough water from the tank so bypass valve
is above the water line.
3. Remove water lines from bypass valve.
4. Remove the two nuts retaining the bypass valve
inside the hood and remove bypass valve.
5. Remove hose barb fitting and attach to new bypass valve.
6. Install new bypass valve with hose barb fitting.
7. Reconnect the water tubes and the wires to the
bypass valve.
8. Refer to Fig. 2 when reconnecting the wires.
WHI/GRN To Dispense Valve
If the sound is heard as described, there may be a
blockage in the bypass valve or the water line to the
sprayhead. Remove the bypass valve and inspect for
wear, and remove waterborne particles.
If the sound is not heard as described, proceed to #6.
WHI/VIO to Brew Selector
Switch
LEFT AND RIGHT VALVE
P774
FIG. 2 BYPASS VALVE TERMINALS
27040 032201
Page 15
SERVICE (cont.)
BREW SELECTOR SWITCH
FIG. 3 BREW SELECTOR SWITCHES
12. Reconnect the pink wire to the grind switch.
13. Disconnect the tan wire from the left or right
selector switch and tan wire from interface socket.
14. Check for continuity across the tan wires.
15. Reconnect the tan wires.
16. With the selector switch set at 1 and 1-1/2 gallon,
disconnect the white/violet from the bypass valve.
17. Check for continuity across the white/violet wire
and terminal on bypass valve.
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18. Reconnect the white/violet wire to the terminal on
the bypass valve.
19. Disconnect the white/red wire from the dispense
valve.
20. Check for continuity across white/red wire and
terminal on dispense valve.
21. Reconnect white/red wire to the terminal on the
P775
dispense valve.
Location:
The brew selector switches are located in the front
left and right side of the hood.
Test Procedure:
1. Disconnect the brewer from the power supply.
2. Separate the connector on the selector switch
harness from the brew timer circuit board.
3. Carefully slide the plastic cover off of the connector from the switch harness.
4. Check for continuity across the pink and tan wires
on the connector when the switch is in the 1/2
gallon position. Continuity must not be present in
any other switch position.
5. Check for continuity across the pink wire and gray
wire when the switch is in the 1 gallon position.
Continuity must not be present in any other position.
6. Reattach the connector to the brew timer circuit
board.
7. Disconnect the gray wire from the left or right
selector switch and gray wire from the interface
socket.
8. Check for continuity across the gray wires.
9. Reconnect the gray wires from the selector switches
and the interface socket.
10. Disconnect the pink wire from the left or right
selector switch to the grinder switch.
11. Check for continuity across the pink wire and the
terminal on the grind switch.
If continuity is present as described the switch is
operating properly.
If continuity is not present as described replace switch
assembly.
Removal and Replacement:
1. Disconnect the connector on the selector switch
harness from the brewer timer circuit board.
2. Disconnect wires from the selector switch, interface socket, dispense valve and bypass valve.
3. Loosen the set screw on the switch knob.
4. Remove the 9/16" nut and washer holding the
switch to the hood.
5. Remove the switch.
6. Install the new switch. The positioning tab must be
in the hole in the hood for proper switch and knob
alignment.
7. Install the knob so that the arrow lines up in the 11/2 gallon position when the switch is turned to the
full right position.
8. Reattach the connector to the brew timer circuit
board.
9. Refer to Fig. 4 when reconnecting the wires.
Page 16
27040 032201
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