BUNN
®
TWF-EZ
OPERATING & SERVICE MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
TELEPHONE: (217) 529-6601 FAX: (217) 529-6644
29466.0000C 8/00 © 1999 Bunn-O-Matic Corporation
CONTENTS
Introduction .............................................................. 2
Warranty ................................................................... 2
User Notices ............................................................. 3
Electrical Requirements ............................................ 4
Plumbing Requirements ........................................... 4
Initial Set-Up ............................................................. 5
Operating Controls.................................................... 6
Cleaning .................................................................... 6
Tea Brewing .............................................................. 6
Adjustments and Optional Settings ........................... 7
Troubleshooting ........................................................ 8
Diagnostic Chart ..................................................... 14
Service.................................................................... 15
Wiring Schematic ................................................... 26
INTRODUCTION
This equipment will brew a half-gallon batch of hot coffee into an airpot server or dispenser and a three-gallon batch
of fresh tea into a dispenser and dispense at approximately room temperature to conserve ice. The brewer 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
29466 082200
Page 3
ELECTRICAL REQUIREMENTS
CAUTION - The brewer must be disconnected from the power source until specified in Initial Set-Up.
120V model brewers require 2-wire, grounded service rated 120 volts ac, 15 amp, single phase, 60 Hz.
Proceed as follows:
Electrical Hook-Up
CAUTION – Improper electrical installation will damage electronic components.
1. An electrician must provide electrical service as specified.
2. Connect the brewer to the power source.
3. Using a voltmeter, check the voltage at the electrical source.
4. 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
These brewers must be connected to a cold water system with operating pressure between 20 (138) and 90
(620 kPa) psi 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).
1. Remove the shipping caps from the bulkhead fittings on the rear of the brewer.
2. Attach the flare fitting from the short piece of tubing on the tee and strainer/flow control (supplied)
to the water inlet fittings at the rear of the brewer.
3. Flush the water line and securely attach it to the
flare fitting on the tee.
4. Turn on the water supply.
5. Place an empty vessel beneath the faucet and lift
the handle until water is dispensed.
P1392
Page 4
29466 082200
INITIAL SET-UP
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
Insert the funnel (empty) into the funnel rails.
Place an empty tea dispenser on the brewer base. Be prepared to empty the dispenser a few times.
Plug in the brewer, place the TEA/OFF/COFFEE switch in the “COFFEE” position, and momentarily press the
start switch. When the flow of water into the tank stops, press the start switch to initiate a second cycle.
Wait until the flow of water stops and start a third cycle. During the third cycle, the tank will fill to its capacity
and the excess will flow from the funnel into the dispenser. The tank heater will come on automatically.
Empty the dispenser when the third cycle stops. Allow the tank to heat (approximately 15 to 20 minutes).
Some water will drip from the funnel during this time; this is due to expansion and will not occur thereafter.
Empty the dispenser.
Place the TEA/OFF/COFFEE switch in the “TEA” position and begin another brew cycle.
Measure the total water volume from the dispenser. It should be approximately (396 ounces.)
If not, see Adjustments and Optional Settings on page 7 to increase or decrease volumes.
Repeat steps 5 & 6 until the recommended total water volume (396 ounces) is achieved.
The concentrate valve is preadjusted to deliver the correct ratio of brew water to dilution water.
Empty the dispenser.
Place the TEA/OFF/COFFEE switch in the “COFFEE” position and begin another brew cycle.
Measure the total water volume from the dispenser. It should be approximately 64 ounces.
If not, see Adjustments and Optional Settings on page 7 to increase or decrease volumes.
Repeat steps 11 & 12 until the recommended total water volume (64 ounces) is achieved.
The brewer is now ready to brew approximately one-half gallon of hot coffee or 3-gallons of freshly brewed
room temperature tea.
Page 5
29466 061599
A. TEA/OFF/COFFEE Switch
OPERATING CONTROLS
TEA- Placing the switch in the full left position allows the start switch to activate a timed brew cycle for a 0.5 gallon
of tea concentrate and 2.5 gallons of dillution water into the dispenser.
COFFEE- Placing the switch in the full right position allows the start switch to activate a timed brew cycle for a 0.5
gallon of coffee into the dispenser.
OFF - Placing the switch in the center position stops the brew cycle. Stopping a brew cycle after it has been started
will not stop the flow of water into the funnel until the tank syphons down to its proper level. The switch should
always be placed in this position after a brew cycle and whenever the brewer is unattended.
B. Start Switch
Starts a brew cycle when the TEA/OFF/COFFEE switch is in the "TEA" or "COFFEE" position.
C. Ready Indicator
This indicator glows when preselected brew water temperature has been achieved. It is also used for diagnostic
testing.
CLEANING
CAUTION - CLEAN AND SANITIZE YOUR ICED TEA BREWER DAILY
1.
2.
3.
4.
Remove and thoroughly clean the entire brew funnel. The funnel tip and screen must be free from any tea
particles or residue. Reassemble the funnel.
Place the TEA/OFF/COFFEE switch in the "OFF" position. Remove and thoroughly rinse the sprayhead. The
holes must be open and clear of any mineral deposits. Wipe the sprayhead panel clean with a damp cloth.
Insert the deliming spring into the sprayhead fitting until no more than two inches is visible and move it in
and out 5 or 6 times. Insert the spring into the air vent hole in the sprayhead panel and move it in and out
5 or 6 times. Reattach the sprayhead.
Wash the entire outside surface of the brewer with a clean damp cloth.
CAUTION - DO NOT KEEP BREWED ICED TEA OVERNIGHT. THE SERVER MUST BE CLEANED DAILY.
BREWING
1.
2.
3.
4.
5.
6.
7.
Begin each brew cycle with a clean empty brew funnel and server. (Be sure the server lid doesn’t interfere
with the flow of dilution water.)
Insert a BUNN® filter into the funnel.
Pour the packet of loose fresh tea leaves or coffee into the filter. Approximately four ounces is recommended for tea.
Level the bed of tea leaves or coffee by gently shaking.
Slide the funnel into the funnel rails until it stops.
Place the TEA/OFF/COFFEE switch in the "TEA" or "COFFEE" position.
Momentarily press the start switch.
CAUTION - The funnel contains hot liquids. Remove funnel slowly.
8.
9.
Carefully discard the used filter when beverage no longer drips from the funnel tip.
Place the TEA/OFF/COFFEE switch in the "OFF" position to prevent a false start.
Page 6
29466 082200
TWF-EZ ADJUSTMENTS & OPTIONAL SETTINGS
Page 7
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 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 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 specified.
Follow recommended service procedures.
Replace all protective shields or safety notices.
Before troubleshooting this brewer, check for the following:
A. Control Board
Locate J6 connector on control board. If jumper is across pins 1 & 2, board is set up to operate this coffee/tea
brewer which does not use a refill system. See page 7 for proper jumper location.
B. Also make sure before servicing brewer that voltage is present at control board. Check for voltage across pins
1 & 7 of the eight pin J1 connector (black and white wires). If voltage is present, proceed with testing. If
voltage is not present, check wiring and voltage at socket. Correct the problem and retest before proceeding
with testing.
Page 8
29466 061599
TROUBLESHOOTING (cont.)
BREW CIRCUIT
PROBLEM
PROBABLE CAUSE
REMEDY
Ready Light Flashing
1. Brewer has shut down due to
malfunction.
Refer to Diagnostic Chart on page
14.
Brew cycle will not start
1. No water
Water lines and valves to the brewer
must be open.
2. No power or incorrect voltage to
the brewer
Check for voltage across the black
and white terminals at the terminal
block.
3. TEA/OFF/COFFEE Switch
a) Check Switch position, confirming that it is in either "TEA" or "COFFEE" position
b) Refer to Service - TEA/OFF/COFFEE Switch for testing procedures.
See page 20
4. Start Switch
Refer to Service - Start Switch for
testing procedures. See page 21
5. Low water temperature (Brew
lockout is enabled)
Allow brewer to heat until ready
lamp is lit, or disable the brew lockout feature. See page 7
6. Brew solenoid valves
Refer to Service - Brew Solenoid
Valves for testing procedures. See
pages 16 or 17
7. Control Board
Attach a voltmeter to terminals J11 & J1-7 of the control board. Connect the brewer to the power
source. Voltage should be present.
Disconnect the brewer from the
power source. Attach a voltmeter
to terminals J1-1 and J1-8. Reconnect the brewer to the power
source. With the TEA/OFF/COFFEE
switch in the "TEA" and/or "COFFEE"
position, voltage should be present.
It should not be present in the "OFF"
position. If these readings are not
correct, replace the control board
assembly. See page 25
Page 9
29466 082200
TROUBLESHOOTING (cont.)
BREW CIRCUIT
PROBLEM
PROBABLE CAUSE
REMEDY
Consistently low beverage level in
the dispenser or beverage overflows dispenser
1. Brew volume (TEA or COFFEE)
NOTE: All volumes to run with
sprayhead attached.
Refer to Adjustments and Optional
Settings to set brew volume. See
page 7. Using a stop watch or second hand, time the length of the
brew cycle. Record this time inside
the top lid. If service is ever needed
again, use the time as reference to
determine if time has changed.
2. Lime build up
Inspect the sprayhead tube and
sprayhead for excessive lime deposits. Delime as required.
3. Brew Solenoid Valves
Refer to Service - Brew Solenoid
Valves for testing procedures. See
pages 16 or 17
4. Dilution Solenoid Valve
Refer to Service - Dilution Solenoid
Valve for testing procedures. See
page 18
Page 10
29466 082200
TROUBLESHOOTING (cont.)
BREW CIRCUIT
PROBLEM
PROBABLE CAUSE
REMEDY
Dripping from sprayhead
1. Lime build up
Inspect the tank assembly for excessive lime deposits. Delime as required.
2. Brew Solenoid Valves
Refer to Service - Brew Solenoid
Valves for testing procedures. See
pages 16 or 17
1. Sprayhead
A seven-hole stainless steel sprayhead must be used for proper extraction.
2. Water temperature
With the "TEA/OFF/COFFEE" Switch
in the "COFFEE" position, place an
empty brew funnel on an empty
decanter beneath the sprayhead.
Initiate brew cycle and check the
water temperature immediately below the sprayhead with a thermometer. The reading must not be less
than 5°F (3°C) below set temperature. Adjust the temperature setting
to increase the water temperature.
Refer to Adjustments and Optional
Settings. See page 7
3. Filter type
BUNN® paper filters must be used
for proper extraction.
4. Funnel loading
The BUNN® paper filter must be
centered in the funnel and the bed
of tea leaves or coffee grounds leveled by shaking gently.
1. Funnel Tip (Tea brewing)
The brew funnel should be cleaned
thoroughly before each brew cycle
to lesson the chance of tea leaf particles clogging the funnel tip.
Weak beverage
Drip out time too long
Page 11
29466 082200
TROUBLESHOOTING (cont.)
BREW CIRCUIT
PROBLEM
PROBABLE CAUSE
REMEDY
Dry tea leaves or coffee grounds remain in the funnel
1. Sprayhead
Make sure sprayhead is present and
holes are clear and unobstructed.
There should be seven separate
streams of water coming out of the
sprayhead.
2. Funnel loading
The BUNN® paper filter must be
centered in the funnel and the bed
of tea leaves or coffee grounds leveled by shaking gently.
Page 12
29466 082300
TROUBLESHOOTING (cont.)
HEATING CIRCUIT
PROBLEM
PROBABLE CAUSE
REMEDY
Water does not heat to proper
temperature
1. Water not touching temperature
probe
Remove probe and grommet. Look
into hole on tank lid. Water must
be within one inch from top of tank.
2. Temperature Probe
Refer to Service - Temperature
Probe for testing procedures. See
page 23
3. Limit Thermostat
CAUTION: Do not eliminate or bypass limit thermostat or thermal
fuse. Use only BOM replacement
part # 29329.1000.
Refer to Service - Limit Thermostat
for testing procedures. See page 19
4. Tank Heater
Refer to Service - Tank Heater for
testing procedures. See page 22
1. Lime build up on temperature
probe, tank or tank heater
Inspect probe and tank assembly
for excessive lime deposits. Delime
as required.
2. Temperature Probe
Refer to Service - Temperature
Probe for testing procedures. See
page 23
3. Control Board
Set the temperature to 205°F
(96°C). Let tank temperature stabilize. If temperature in tank is
above temperature setting by more
than 7°F (4°C), replace the control
board. See page 24
1. Plumbing lines
Plumbing lines should not rest on
the counter top.
2. Water supply
The brewer must be connected to
a cold water supply.
3. Lime build up
Remove the tank lid and clean inside of tank with a deliming agent,
if necessary.
IMPORTANT: Make sure no temperature tests are taken before the
ready light is "ON". Tank temperature must be stabilized before readings are taken.
Spitting or excessive steaming
Brewer is making unusual noises
Page 13
29466 082200
DIAGNOSTICS
Intermittent flashing of the READY indicator indicates that a fault exists. Count the number of flashes between
pauses and use this chart as a guide to investigating the fault.
FLASHES CAUSE
THINGS TO CHECK
1
Dry Plug - In Fault Sheath of temperature probe dry for 10 minutes after power-up
Water Pressure (Is water shut off?)
Temperature probe wiring
Fill valve wiring, function, & strainer
Green wire between tank and circuit board
2
Low Tank Level Fault Level probe dry for 7 minutes after fill valve is energized
Water pressure (Is water shut off?)
Shorting pin on J6 connector of control board
not on correct set of pins (See page 7)
Level probe wiring
Temperature probe wiring
Fill valve wiring, function, & strainer
3
Low Water Temperature Fault Sensor in tank is calling for heat for 30 minutes or more
Tank heater wiring & function
Temperature probe wiring
4
Tank Sensor Disagreement Level probe detects water, but dry plug-in probe dry
Temperature probe wiring
Level probe wiring
Green wire between tank and circuit board
5
Temp Sensor Out-of-Range - High
Sensor not connected to circuit board
6
Temp Sensor Out-of-Range - Low
Sensor wires shorted together or to chassis
Page 14
29466 061599
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 disconnected
from the power source 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 top cover and rear inspection panel.
The top cover is attached with four #6-32 screws.
Removal of the top cover will allow access to TEA/OFF/
COFFEE switch, START switch, Control Board, limit
thermostat, temperature probe, thermal fuse and tank
heater,
The rear inspection panel is attached with six #832 screws. Removal of the rear panel will allow access
to the solenoid valves and the .195 GPM flow control.
FIG. 1 COMPONENT ACCESS
P1808.40
Contents
Brew Solenoid Valve (Hot Coffee) ....................... 16
Brew Solenoid Valve (Iced Tea) .......................... 17
Dilution Solenoid Valve ....................................... 18
Limit Thermostat ................................................ 19
TEA/OFF/COFFEE Switch ..................................... 20
START Switch ..................................................... 21
Tank Heater ......................................................... 22
Temperature Probe ............................................. 23
Thermal Fuse ...................................................... 24
Control Board ..................................................... 25
Wiring Diagram .................................................. 26
Page 15
29466 082200
Page 16
SERVICE (cont.)
6. Check the iced tea solenoid valve for coil action.
Connect the brewer to the power source. With TEA/
OFF/COFFEE switch in the "TEA" position press
the start switch and listen carefully in the vicinity
of the solenoid valve for a "clicking" sound as the
coil magnet attracts.
7. Disconnect the brewer from the power source.
BREW SOLENOID VALVE (ICED TEA)
If the sound is heard as described and water will not
pass through the solenoid valve, there may be a blockage in the water line before the solenoid valve or, the
solenoid valve may require inspection for wear, and
removal of waterborne particles.
If the sound is not heard as described, replace the
solenoid valve.
P1960.60
FIG. 4 ICED TEA BREW SOLENOID VALVE
Location:
Viewing the brewer from the rear the iced tea brew
solenoid valve is mounted in the center of the mounting bracket.
Test Procedures:
1. Disconnect the brewer from the power source.
2. Disconnect the white/blue and white wires from
the iced tea brew and dilution solenoid valves. With
the TEA/OFF/COFFEE switch in the "TEA" position
press the start switch.
3. With a voltmeter, check the voltage across the
white/blue and white wires. Connect the brewer
to the power source. The indication must be 120
volts ac.
4. Disconnect the brewer from the power source.
Removal and Replacement:
1. Remove all wires from solenoid valves.
2. Turn off the water supply to the brewer.
3. Disconnect the water lines to and from the solenoid valves.
4. Remove the two #8-32 keps nuts holding the
mounting bracket to the brewer base.
5. Lift out the bracket.
6. Remove the two #10-32 slotted-head screws holding the iced tea brew solenoid valve to the mounting bracket.
7. Securely install the new iced tea brew solenoid
valve to the mounting bracket.
8. Attach the mounting bracket to the brewer base.
9. Securely fasten the water lines to and from the
solenoid valves.
10. Refer to Fig. 5 when reconnecting the wires.
WHI to Main
Harness
If voltage is present as described, proceed to #5.
If voltage is not present as described, refer to the Wiring Diagram and check brewer wiring harness.
5. Check for continuity across the iced tea brew solenoid valve coil terminals.
WHI/RED
to Switch
HOT COFFEE
BREW SOLENOID
ICED TEA BREW
SOLENOID
If continuity is present as described, reconnect the
WHI/BLU
DILUTION
to Switch
white/blue and white wires to the solenoid.
SOLENOID
If continuity is not present as described, replace the
P1364
solenoid valve.
FIG.5 SOLENOID VALVE TERMINALS
29466 082200
Page 17
Page 18
SERVICE (cont.)
LIMIT THERMOSTAT
5. With a voltmeter, check the voltage across the exposed terminal of the limit thermostat and the
white wire on the tank heater terminal. Connect
the brewer to the power source. The indication
must be 120 volts ac.
6. Disconnect the brewer from the power source.
If voltage is present as described, reconnect the black
wire to the limit thermostat. The limit thermostat is
operating properly.
If voltage is not present as described, replace the limit
thermostat.
P1960.60
FIG. 8 LIMIT THERMOSTAT
Location:
The limit thermostat is located inside the hood on
the tank lid.
Removal and Replacement
1. Remove both wires from the limit thermostat terminals.
2. Carefully slide the limit thermostat out from under the retaining clip.
3. Carefully slide the new limit thermostat into the
retaining clip.
4. Refer to Fig. 9 when reconnecting the wires.
Test Procedure:
1. Disconnect the brewer from the power source and
remove the blue wire from the limit thermostat.
2. With a voltmeter, check the voltage across the blue
wire removed from the limit thermostat and the
white wire on the tank heater terminal. Connect
the brewer to the power source. The indication
must be 120 volts ac.
3. Disconnect the brewer to from the power source.
If voltage is present as described, reconnect the blue
wire and proceed to #4.
If voltage is not present as described, refer to the Wiring Diagram and check the wiring harness.
BLK Thermal Fuse
to Tank Heater
BLU to Control
Board (N.O.)
P1800
FIG. 9 LIMIT THERMOSTAT TERMINALS
4. Remove the black wire from the limit thermostat.
Page 19
29466 061599
SERVICE (cont.)
6. Viewing the switch from the rear, check for continuity across the center and left terminals of the
top row when switch is in the "TEA" position and
the center and right terminals of the top row when
the switch is in the "COFFEE" position.
7. Viewing the switch from the rear, check for continuity across the center and left terminals of the
second row from the bottom when switch is in
the "TEA" position. Also check for continuity across
the center and right terminals of the second row
from the bottom when the switch is in the "COFFEE" position.
8. Viewing the switch from the rear, check for continuity across the center and left terminals of the
bottom row when switch is in the "TEA" position.
Also check for continuity across the center and
right terminals of the bottom row when the switch
is in the "COFFEE" position.
TEA/OFF/COFFEE SWITCH
If continuity is present as described, replace the wires,
the switch is operating properly.
If continuity is not present as described, replace the
switch.
P1808.40
FIG. 10 TEA/OFF/COFFEE SWITCH
Location:
The TEA/OFF/COFFEE switch is located in the front
of the hood, above and to the left of the brew funnel.
Removal and Replacement:
1. Remove the wires from the switch terminals.
2. Compress the clips inside the hood and gently
push the switch through the opening.
3. Push the new switch into the opening and spread
the clips to hold the switch captive in the hood.
4. Refer to FIG. 11 when reconnecting the wires.
Test Procedure:
1. Disconnect the brewer from the power source.
2. Remove the black and white/violet wires from the
switch terminals.
3. With a voltmeter, check the voltage across the
black wire removed from the TEA/OFF/COFFEE
switch and the white/green wire remaining on the
switch terminal.
4. Connect the brewer to the power source.The indication must be 120 volts ac.
5. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #6.
If voltage is not present as described, refer to the Wiring Diagram and check the wiring harness.
Page 20
WHI/VIO to
Board J1-8
BLK to
Board J1-7
WHI/VIO to
Board J1-8
VIO to
Board J3-2
ORA to
Board J3-1
YEL to
Board J3-3
WHI/BLU to
Tea Solenoid
WHI/GRN to
Board J1-4
WHI/RED to
Coffee Solenoid
P1525
FIG.11 TEA/OFF/COFFEE SWITCH TERMINALS
29466 082200
SERVICE (cont.)
START SWITCH
Removal and Replacement:
1. Remove the wires from the switch terminals.
2. Compress the clips inside the hood and gently
push the switch through the opening.
3. Push the new switch into the opening and spread
the clips to hold the switch captive in the hood.
4. Refer to Fig. 13 when reconnecting the wires.
WHI/ORA to
Board J5-6
WHI/YEL to
Board J5-1
FIG. 13 START SWITCH TERMINALS
FIG. 12 START SWITCH
P1368
P1808.40
Location:
The start switch is located in the front of the hood,
above and to the right of the brew funnel.
Test Procedure:
1. Disconnect the brewer from the power source.
2. Remove white/yellow and white/orange wires from
the Start switch.
3. Check for continuity across the two terminals on
the left side of the switch when it is held in the
lower position. Continuity must not be present
across these terminals in the upper position.
If continuity is present as described, reconnect the
wires, the switch is operating properly.
If continuity is not present as described, replace the
switch.
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29466 061599
SERVICE (cont.)
TANK HEATER
FIG. 14 TANK HEATER
P1960.60
Location:
The tank heater is located inside the tank and secured to the tank lid.
Test Procedures:
1. Disconnect the brewer from the power supply.
2. With a voltmeter, check the voltage across the
black and white wires. Connect the brewer to the
power source. The indication must be 120 volts
ac.
3. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #4
If voltage is not present as described, refer to the Wiring Diagram and check wiring harness.
4. Disconnect the black wire and the white wire from
the tank heater terminals.
5. Check for continuity across the tank heater terminals.
2. Remove the temperature probe and grommet from
the tank lid.
3. Disconnect and remove the faucet tube.
4. Remove sprayhead and the hex nut securing the
sprayhead tube to the hood. Set aside for reassembly.
5. Disconnect and remove the water inlet tube.
6. Disconnect vent tube.
7. Remove the eight #8-32 nuts securing the tank
lid and the green grounding wire to the tank.
8. Remove the tank lid with limit thermostat, sprayhead tube, tank heater, faucet coil and vent tube.
9. Remove the two hex nuts securing the tank heater
to the tank lid. Remove tank heater with gaskets
and discard.
10. Install new tank heater with gaskets on the tank
lid and secure with two hex nuts.
11. Install tank lid with limit thermostat, sprayhead
tube, tank heater, faucet coil and vent tube. Install
green grounding wire to tank stud and secure with
eight #8-32 nuts.
12. Secure sprayhead tube to hood using a hex nut.
13. Install sprayhead.
14. Connect vent tube to fitting.
15. Install the faucet tube.
16. Install water inlet tube.
17. Install the temperature probe and grommet to the
tank lid.
18. Reconnect the wires to the limit thermostat and
tank heater. See limit thermostat section when
reconnecting wires.
19. Refer to Fig.15 when reconnecting the tank heater
wires.
If continuity is present as described, reconnect the
wires, the tank heater is operating properly.
If continuity is not present as described, replace the
tank heater.
NOTE- If the tank heater remains unable to heat, remove and inspect heater for cracks in the sheath.
Removal and Replacement:
1. Disconnect the black wire and white wire from the
tank heater terminals.
Page 22
FIG. 15 TANK HEATER TERMINALS
P1369
SERVICE (cont.)
TEMPERATURE PROBE
FIG. 16 TEMPERATURE PROBE
P1960.60
Page 23
SERVICE (cont.)
Removal and Replacement:
1. Disconnect the thermal fuse from the right tank
heater terminal and the limit thermostat.
2. Remove thermal fuse and discard.
3. Connect new thermal fuse to the right tank heater
terminal and the limit thermostat
4. Refer to Fig. 19 when reconnecting wires.
THERMAL FUSE
FIG. 18 THERMAL FUSE
P1960.60
P1393
FIG. 19 THERMAL FUSE TERMINALS
Location:
The thermal fuse is located inside the hood connected to the right tank heater terminal.
Test Procedures:
1. Disconnect the brewer from the power source.
2. Disconnect the thermal fuse from the tank heater
terminal and the limit thermostat.
3. With an ohmmeter, check for continuity across
the thermal fuse terminals.
If continuity is present as described, the thermal fuse
is operating properly.
If continuity is not present as described, replace the
thermal fuse.
Page 24
29466 061599
SERVICE (cont.)
TRM1
CONTROL BOARD
TR
M2
J1
J3
J7
J4
J2
J6
J5
P1960.50
FIG. 20 CONTROL BOARD
Page 25
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29466 082200
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