Bunn Dual TF User 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
27124.0000 6/00 ©1996 Bunn-O-Matic Corporation
INTRODUCTION
This equipment will brew two half-gallon, gallon, or gallon and three forths 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 BUNN® .5 gallon
and 1.75 gallon servers. It is only for indoor use on a sturdy counter or shelf.
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
27124 050800
00831.0000
! WARNING
ELECTRICAL REQUIREMENTS
CAUTION - The brewer must be disconnected from the power source until specified in
L2 RED
200 or 240V A.C.
L1 BLACK
Requires 2-wire, grounded
service rated 200 to 240 volts
ac, 30 amp, single phase 50
or 60 Hz.
L2 RED
WHITE
NEUTRAL
L1 BLACK
120V A.C.
208 or 240V A.C.
120V A.C.120V A.C.
Requires 3-wire, grounded service rated 120/208 or 120/240
volts ac, 30 amp, single phase,
60 Hz.
HOT WATER
Initial Set-Up.
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 or quick disconnect 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.
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 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.
Page 4
27124 062100
INITIAL SET-UP (cont.)
4. Wait approximately twenty minutes for the water in the tank to heat to the proper temperature.
5. Place an empty server beneath either of the brew stations. Place its associated Selector switch in the desired
position, the On/Off switch in the upper position and initiate a brew cycle.
6. Place the On/Off switch in the lower “OFF” position after water has stopped flowing from the funnel, and check
the water volume in the server. It should be 64 oz (1/2 gallon), 128 oz (1 gallon), 224 oz (1-3/4 gallon) or adjust
volume to your company specifications. On models with Digital Timers, refer to
adjustments.
NOTE: Brewer will not operate if the server size does not match the selected batch size.
7. (A) If not, disconnect the brewer from the power source, remove the front panel, and adjust the brew timer for
that brew station as required. Replace the front panel, connect the brewer to the power source, allow the water
to reheat, start, and measure another brew cycle.
(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 of 1
gallon and 1-3/4 gallon.
8. Repeat step 7 until the proper water volume is achieved.
9. Repeat steps 5 through 8 for the other brew station.
10. The brewer is now ready for use in accordance with the coffee brewing instructions.
Service
section for
OPERATING CONTROLS
BREW SELECTOR SWITCH
Placing the switch in the 1⁄2 Gal, 1 Gal, or 1-3⁄4 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 server sensor 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 server sensor 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 to the grinder interface.
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 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 that matches the selected batch size.
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 5
27124 062100
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 Probable Cause Remedy
Equipment will not operate.
1. No power or incorrect voltage.
(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.
Brew cycle will not start.
1. Server
Make sure the server size agrees
with the batch selection (.5 gallon =
.5 gallon, 1.75 gallon = 1 & 1.75
gallon)
2. No water
Check plumbing and shut-off valves
Page 6
27124 050800
TROUBLESHOOTING (cont.)
Problem
Brew cycle will not start (cont.)
Probable Cause
3. Water strainer/flow control (.750
GPM)
4. ON/OFF switch
5. Start switch
6. Timer
7. Dispense Valve
Remedy
(A) Direction of flow arrow must be
pointing towards brewer.
(B) Remove the strainer/flow control and check for obstructions. Clear
or replace.
Refer to
Service
- ON/OFF switch for
testing procedures. See page 28
Refer to
Service -
Start switch for
testing procedures. See page 34
Refer to
Service -
Timer for testing
procedures. See page 36 or 38
Refer to
Service -
Dispense valve for
testing procedures. See page 19
Automatic refill will not operate
8. Control Assembly (Electronic)
9. Brew selector switch
10. Server sensor
1. No water
2. Water strainer/flow control (.750
GPM)
3. Solenoid Valve (Inlet)
Refer to
Service
- Control assembly
for testing procedures. See pages
20 thru 25
Refer to
Service
- Brew selector
switch for testing procedures. See
page 14
Refer to
Service
- Server sensor for
testing procedures. See page 29
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.
Refer to
Service
- Solenoid valve for
testing procedures. See page 33
Page 7
27124 062100
TROUBLESHOOTING (cont.)
Problem Probable Cause
Automatic refill will not operate
4. Overflow protection switch
(cont.)
5. (A) Level control board & level
probe. (Electro/mechanical controlled)
(B) Electronic controls
Beverage level will not adjust (Se-
1. Brew Selector switch
lector switch in any position)
Water flows into tank continuously .
1. Solenoid valve
2. (A) Level control board and level
probe (Electro/mechanical)
Remedy
Refer to
Service -
Overflow protection switch for testing procedures.
See page 30
Refer to
Service
- Level control board
for testing procedures. See page 26
Refer to
Service
- Electronic controls for testing procedures. See page
20 thru 25
Refer to
Service
- Selector switch for
testing procedures. See page 14
Refer to
Service
- Solenoid valve for
testing procedures. See page 33
Refer to
Service
- Level control board
for test procedures. See page 26
Water flows into tank continuously
(ON/OFF switch "ON").
Water from tank is not hot
(B) Control assembly (Electronic)
3. Overflow protection switch
1. Timer
1. Limit thermostat
CAUTION - Do not eliminate or bypass limit thermostat. Use only replacement part #23717.0001
2. (A) Control Thermostat (Electro/
mechanical
Refer to
Service
- Control assembly
for testing procedures. See page 20
thru 25
Refer to
Service
- Overflow protection switch for testing procedures.
See page 30
Refer to
Service
- Timer for testing
procedures. See page 36 or 38
Refer to
Service
-Limit thermostat
for testing procedures. See page 27
Refer to
Service
- Control Thermostat for testing procedures. See page
18
Page 8
27124 062100
TROUBLESHOOTING (cont.)
Problem
Water from tank is not hot (cont.).
Spitting or unusual steaming from
sprayhead or airvents.
Probable Cause
(B) Control assembly (Electronic)
3. Contactor (Brewers with Recovery booster)
4. Tank heaters
5. Triac assembly (Electronic)
6. Relay (Brewers with Recovery
Booster)
1. (A) Control thermostat (Electro/
mechanical)
Remedy
Refer to
Service
- Control assembly
for testing procedure. See page 20
thru 25
Refer to
Service
- Contactor for test-
ing procedures. See page 16
Refer to
Service
- Tank heaters for
testing procedures. See page 35
Refer to
Service
- Triac assembly for
testing procedures. See page 24
Refer to
Service
- Relay for testing
procedures. See page 31
Refer to
Service
- Control thermostat for testing procedures. See page
18
Inconsistent beverage level in server.
(B) 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.
1. Strainer/flow control (.750 GPM)
Refer to
Service
- Control assembly
for testing procedures. See page 20
thru 25
Refer to
Service
- Triac assembly for
testing procedures. See page 24
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.
Page 9
27124 050800
TROUBLESHOOTING (cont.)
Problem Probable Cause Remedy
Inconsistent beverage level in server.
(cont.)
Consistently high or low beverage
level in server.
Dripping from sprayhead.
Water overflows filter.
2. Improper water pressure
3. Dispense valve
4. Bypass valve
1. Timer adjustment
1. Dispense valve
1. Bypass valve
Check the operating water pressure
to the brewer. It must be between 20
and 90 psi (138 and 620 kPa).
Refer to
Service -
Dispense valve for
testing procedures. See page 19
Refer to
Initial Set-Up
on page 5 step
#7. For test procedure see page 13.
Adjust the timer as required to
achieve the recommended volume
for each brew cycle.
Refer to
Service
- Dispense valve for
testing procedures. See page 19
Refer to
Initial Set -Up
on page 5
step #7. For test procedures see
page 13.
Beverage overflows server
2. Needle Valve
3. Type of paper filters
4. No sprayhead
1. Beverage left in server
2. Timer adjustment
3. Dispense valve
Refer to
Initial Set-Up
on Page 5
step #7.
.
BUNN® paper filters should be used
for proper extraction.
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 36 or 38
Refer to
Service
- Dispense valve for
testing procedures. See page 19
Page 10
27124 050800
TROUBLESHOOTING (cont.)
Problem Probable Cause Remedy
Weak beverage
1. Type of paper filters
2. Coffee
3. Sprayhead
4. Funnel loading
5. Water temperature
®
BUNN
paper filters should be used
for proper extraction.
A sufficient quantity of fresh drip or
regular grind should be used for
proper extraction.
B.O.M. sprayhead #01082.0002
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.
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 (76° 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 11
27124 050800
SERVICE
Contents
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 server
platform.
Brew Selector Switch............................................ 14
Bypass Valve ........................................................ 13
Contactor Assembly.............................................. 16
Control Thermostat............................................... 18
Dispense Valve ..................................................... 19
Electronic Control .................................... 20 thru 25
Grinder Selector Switch ........................................25
Level Control Board and Level Probe .................... 26
Limit Thermostat .................................................. 27
ON/OFF Switch...................................................... 28
Overflow Protection Switch .................................. 30
Relay .................................................................... 31
Server Sensor ....................................................... 29
Solenoid ............................................................... 33
Start Switch (Brew) .............................................. 34
Tank Heaters.........................................................35
Timers ............................................................. 36,38
Wiring Diagrams...................................... 40 thru 47
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DISCONNECT FROM POWER SOURCE
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REPLACEMENT OF ANY COMPONENT!
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OPERATING PROCEDURES
1.Check Server size if
Brewer refuses to brew.
°F ± 5°
2.McDonald's Brew
Temperature: 200
N
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(3-18-96)
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C
.
R
N
P
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X
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Y
A
E
C
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M
R
-
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P
L
O
T
O
-
T
.
M
E
N
N
N
E
O
N
O
U
M
B
H
N
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E
5
8
U
L
E
9
O
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F
1
R
T
A
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R
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I
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8
5
6
:
N
P
I
!
T
C
A
U
T
H
O
I
L
I
U
Q
HOT WATER
CAUTION
!
N
O
I
!
T
C
A
R
E
T
N
A
C
Y
T
P
M
E
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Q
The top cover is attached with four #4-40 slot-
ted head screws.
P970
The front inspection panel is attached with
seven #6-32 slotted head screws.
The sever platform is attached with four #6-32
slotted head screws.
Page 12
27124 062100
SERVICE (cont.)
1.5
.5
2.5
MINUTES
MINUTES
MINUTES
P/N 24486-0000 120 VAC
BUNN-O-MATIC
1.5
.5
2
.5
MINUTES
MINUTES
MINUTES
P/N 24486-0000 120 VAC
BUNN-O-MATIC
BYPASS VALVE
If voltage is not present as described refer to the wiring
diagrams and check the brewer wiring harness.
5. Check for continuity across the bypass valve coil
terminals.
If continuity is present as described, reconnect the
white/green and white/ violet wires to the bypass
valve, brew-lock if necessary and proceed to #6.
If continuity is not present as described, replace the
bypass valve.
5
6
C
4
I
T
A
7
M
O
-
3
N
4
N
U
8
B
5
3
2
S
1
6
2
2
E
T
U
5
.
N
2
I
1.5
M
S
.
E
C
I
1
T
T
C
U
S
A
A
E
N
I
M
V
1
T
-
M
0
U
O
2
-
C
N
1
I
3
N
A
M
N
V
-
U
0
0
5
2
B
2
6
6
1
.5
2
C
S
4
I
0
N
E
/
T
0
T
P
A
0
U
7
0
M
-
-
N
6
I
O
8
-
M
3
4
N
4
4
N
2
U
8
N
B
5
/
P
3
2
S
1
6
2
2
E
T
U
.5
N
2
I
1.5
M
S
.
E
C
I
1
T
T
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U
A
S
A
N
E
I
M
V
-
1
T
M
0
O
U
2
-
C
N
1
N
I
3
A
N
M
-
V
U
0
0
2
B
2
6
1
.5
2
S
N
0
/
E
0
P
T
0
U
0
-
N
6
I
8
M
4
4
2
N
/
P
6. Check the bypass valve for coil action. Connect
brewer to the power source. With the "ON/OFF"
switch in the "ON" position press the start switch.
Listen carefully in the vicinity of the by-pass valve
for a "clicking" sound as the coil attracts and repels
the plunger.
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 1-3/4 gallon server under funnel.
2. Disconnect the white/green wire and the white/
violet wire on the bypass valve.
NOTE: ECA MODELS ONLY - Brewer must be at
operating temperature to perform step #3 or brewlock must be bypassed. To bypass brew-lock
disconnect white/orange and brown/black for right
timer or orange and red/black for left timer from
brew-lock of ECA and connect harness leads together.
3. Check the voltage across the white/green and the
white/violet wires with a voltmeter. Connect the
brewer to the power source. With the "ON/OFF"
switch in the "ON' position, the selector switch in
the 1 or 1-3/4 gallon position press the start
switch. The indication must be:
a.) 120 volts ac for three wire 120/208 volt mod-
els and three wire 120/240 volt models.
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models.
4. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #5.
P971
If the sound is heard as described, there may be a
blockage in the water line before the bypass valve or
the bypass valve may require inspection for wear and
removal of waterborne particles.
If the sound is not heard as described, replace the
bypass valve.
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 the illustration below when reconnecting
the wires.
WHI/GRN to Dispense Valve
WHI/VIO to Brew Selector Switch
LEFT AND RIGHT VALVE
P774
Page 13
SERVICE (cont.)
BREW SELECTOR SWITCH
present in any other position.
10. Check for continuity across the pink wire and gray
wire on the selector switch when the switch is in
the 1 gallon position. Continuity must not be
present in any other position.
11. Reconnect the gray and tan wire on the selector
switch to the gray and tan wires on the interface
socket.
12. Reconnect the pink wire on the selector switch to
the grinder switch.
N
O
I
N
T
A
R
O
P
R
O
C
C
I
T
.
A
A
M
.
-
S
.
O
-
U
N
,
N
S
I
U
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B
N
I
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S
L
T
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B
I
T
D
,
UN
A
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E
D
/
R
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W
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U
I
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Z
F
:
T
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S
R
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I
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P
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A
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W
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F
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.
H
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IN
O
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M
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S
P
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B
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Y
A
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R
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R
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E
N
O
O
R
P
G
N
I
T
A
R
E
P
O
°F ± 5°
1. Check Server size if
Brewer refuses to brew.
2. McDonald's Brew
Temperature: 200
(3-18-96)
R
E
T
N
N
A
O
C
I
E
T
D
D
U
R
A
A
C
C
S
I
D
:
!
F
I
D
E
K
D
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Y
A
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T
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P
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Y
M
.
A
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D
A
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C
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.
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T
H
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B
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I
E
.
T
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.
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S
E
Y
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.
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J
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I
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T
.
R
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M
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K
P
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IS
E
C
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IC
O
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Y
A
C
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M
-
T
P
L
-O
O
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M
N
N
H
N
O
U
E
N
B
C
R
85
U
O
F
19
A
T
E
R
U
L
I
A
F
8
65
:
N
P
N
O
I
!
T
C
A
U
T
H
O
D
I
L
I
U
Q
N
O
I
!
T
C
A
U
T
H
O
D
I
L
I
U
Q
P972
Location:
The brew selector switches are located in the
front left and right side of the hood.
Test Procedure:
Timer: Left or Right
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.
Grinder Interface: Left or Right:
7. Disconnect the gray and tan wires on the selector
switch from the gray and tan wires on the interface
socket.
8. Disconnect the pink wire on the selector switch
from the grinder switch.
9. Check for continuity across the pink wire and tan
wire on the selector switch when the switch is in
the 1/2 gallon position. Continuity must not be
Bypass Valve: Left or Right
13. Disconnect the white/violet on the selector switch
from the bypass valve coil and disconnect the
white/red from the dispense valve coil.
14. Check for continuity across the white/violet and
the white/red wires when the selector is in the 1
gallon and 1-3/4 gallon position. Continuity must
not be present in any other position.
15. Reconnect the white/violet to the bypass valve coil
and white/red to the dispense valve coil.
Server Sensor: Left or Right
16. Disconnect the yellow, white/orange and the orange wires on the selector switch from the yellow,
white/orange and orange wires of the brewer wiring harness.
17. Check for continuity across the white/orange and
yellow wires on the selector switch when the
switch is in the 1/2 gallon position. Continuity
must not be present in any other position.
18. Check for continuity across the white/orange and
orange wires of the selector switch when the
switch is in the 1 gallon and 1-3/4 gallon position.
Continuity must not be present in any other position.
19. Reconnect the yellow, white/orange and orange
wires.
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, bypass valve and
proximity sensor harness.
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.
Page 14
SERVICE (cont.)
BREW SELECTOR SWITCH (cont.)
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 points to the 13/4 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 the illustration below when reconnecting
the wires.
WHI/VIO to Left or Right
By-Pass Valve
ORA to Server Sensor ORA
(Pin #3)
WHI/ORA To Left or Right
Start Switch (Electro/mechanical)
WHI/ORA to Interlock Assy
(Electronic)
GRY from Left or Right Selector Switch
to GRY Lead on Interface Socket
PNK from Left Selector Switch
to Grinder Switch (Lower Left)
PNK from Right Selector Switch
to Grinder Switch (Lower Right)
TAN from Left or Right Selector Switch
to TAN Lead on Interface Socket
YEL toServer Sensor
YEL (Pin #4)
WHI/RED to Left or Right
Dispense Valve
WHI/GRN to Left or Right Dispense Valve
and Left or Right Bypass Valve
To Left or Right Timer
TAN
GRY
PNK
Page 15
P991
27124 050800
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