Bunn Coffeemaker TWF User Manual

®
BUNN  
TW  
TWF  
DISCONTINUED VERSION  
The information in this manual  
is no longer current.  
OPERATING & SERVICE MANUAL  
BUNN-O-MATIC CORPORATION  
POST OFFICE BOX 3227  
SPRINGFIELD, ILLINOIS 62708-3227  
TELEPHONE: (217) 529-6601 FAX: (217) 529-6644  
10510.0000 11/00 © 1990 Bunn-O-Matic Corporation  
USER NOTICES  
Carefully read and follow all notices on the equipment and in this manual. They were written for your protec-  
tion. All notices on the equipment should be kept in good condition. Replace any unreadable or damaged labels  
#00656.0000  
#03408.0000  
#00831.0000  
#02822.0000  
#03409.0000  
10510 081599  
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 volt  
ac, 15 amp, single phase, 60 Hz.  
L2 RED  
120/208V model brewers require 3-wire, grounded service rated 120/  
208 volt, 20 amp, single phase, 60 Hz.  
120V.A.C.  
WHITE  
208V.A.C.  
NEUTRAL  
L1 BLACK  
120V.A.C.  
Electrical Hook-Up  
CAUTION – Improper electrical installation will damage electronic components.  
1. An electrician must provide electrical service as specified.  
2. Remove the top lid and rotate the control thermostat knob fully counterclockwise to the "OFF" position.  
3. a) 120V brewers have an attached cordset. Plug in the brewer and proceed to #6.  
b) 120/208V brewers, feed the cord through the strain relief at the rear of the brewer and connect it to the  
terminal block.  
4. Using a voltmeter, check the voltage and color coding of each conductor at the power source.  
5. Connect the brewer to the power source and verify the voltage at the terminal block.  
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  
These brewers must be connected to a cold water system with operating pressure between 20 (128) and 90  
1
psi (620 kPa) from a 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  
1
water inlet fitting is 4" flare.  
1
3
NOTE - Bunn-O-Matic recommends 4" copper tubing for installations of less than 25 feet and 8" for more than  
1
25 feet from the 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.  
1. Remove the shipping cap(s) from the bulkhead fitting(s) on the rear of the brewer.  
2. Attach the flare fitting from the short piece of tubing on the strainer/flow control (supplied) to the water inlet  
fitting(s) at the rear of the brewer.  
3. Flush the water line and securely attach it to the flare fitting on the tee or strainer/flow control.  
4. Turn on the water supply.  
5. On brewers with a faucet, place an empty vessel beneath the faucet and lift the handle until water is dis-  
pensed.  
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).  
10510 071000  
Page 4  
PLUMBING REQUIREMENTS (cont.)  
P1394  
P1392  
BREWERS W/FAUCET  
BREWERS W/OUT FAUCET  
INITIAL SET-UP  
CAUTION – The brewer must be unplugged throughout the initial set-up, except when specified in the instruc-  
tions.  
1. Remove the top lid from the brewer.  
2. Rotate the control thermostat knob fully counterclockwise to the “OFF” position and replace the top lid.  
3. Insert the funnel (empty) into the funnel rails.  
4. Place an empty tea dispenser on the brewer base. Be prepared to empty the dispenser a few times.  
5. 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. Empty the dispenser when this third cycle stops.  
6. Place the TEA/OFF/COFFEE switch in the “TEA” position and begin another brew cycle.  
7. Measure the total water volume from the dispenser. It should be approximately (396 ounces.)  
8. If not, adjust the Iced Tea Brew Timer (right timer) as required. (See Adjusting Brew Volume)  
9. Start, and measure another cycle.  
10. Repeat steps 7-9 until the recommended total water volume (396 ounces) is achieved.  
11. The concentrate valve is pre-adjusted to deliver the correct ratio of brew water to dilution water.  
12. Unplug the brewer, remove the top lid, rotate the control thermostat knob fully clockwise to the “ON” position  
and replace the top lid.  
13. Empty the dispenser.  
14. Plug in the brewer and wait for the water in the tank to heat to brewing temperature (approximately 20  
minutes). Some water will drip from the funnel during this time; this is due to expansion and should not  
occur thereafter.  
15. Place the TEA/OFF/COFFEE switch in the “COFFEE” position and begin another brew cycle. Empty the reser-  
voir after water has stopped flowing from the funnel.  
16. Allow the water in the tank to heat to the proper temperature and begin another brew cycle.  
17. Measure the total water volume from the dispenser. It should be approximately 64 ounces.  
18. If not, adjust the Coffee Brew Timer (left timer) as required. (See Adjusting Brew Volume)  
19. Start, and measure another cycle.  
20. Repeat steps 17-19 until the recommended total water volume (64 ounces) is achieved.  
21 The brewer is now ready to brew approximately one-half gallon of hot coffee or 3-gallons of freshly brewed  
room temperature tea.  
10510 071000  
Page 5  
INITIAL SET-UP (cont.)  
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 remem-  
bers 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 program-  
ming to be done until switch is once again placed in the “SET” position.  
CLEANING  
CAUTION – Do not keep brewed tea overnight. Clean and sanitize your iced tea dispenser daily  
1. Remove and thoroughly clean the brew funnel. The funnel tip and screen must be free from any tea particles  
or residue. Reassemble the funnel.  
2. Unplug the brewer. 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.  
3. Insert the deliming spring into the sprayhead fitting until no more than one inch is visible and move it in and  
out 5 or 6 times. Insert the spring into the airvent hole in the sprayhead panel and move it in and out 5 or 6  
times. Reattach the sprayhead.  
4. Wash the entire outside surface of the brewer with a clean damp cloth.  
10510 071000  
Page 6  
OPERATING CONTROLS  
A. TEA/OFF/COFFEE Switch  
TEA– Placing the switch in the left position allows the start switch to activate a timed brew cycle delivering .5  
gallon of tea concentrate and 2.5 gallons of dilution water into the dispenser.  
OFF – Placing the switch in the center position stops the brew cycle. Stopping a brew cycle after it has started  
will not stop the flow of water into the funnel until the tank syphons down to its level. The switch should always  
be placed in this position after a brew cycle and whenever the brewer is unattended.  
COFFEE– Placing the switch in the right position allows the start switch to activate a timed brew cycle delivering  
.5 gallon of hot coffee into an airpot dispenser.  
B. Start Switch  
Starts a brew cycle when the TEA/OFF/COFFEE switch is in either the “TEA” or “COFFEE” position.  
BREWING  
1. Begin brewing with a clean empty brew funnel and dispenser. (Be sure the server lid doesn't interfere with  
the flow of dilution water)  
2. Insert a BUNN® filter into the funnel.  
3. Pour the packet of fresh tea leaves or coffee into the filter. Approximately 4 ounces is recommended for tea.  
4. Level the bed of tea leaves or coffee by gently shaking.  
5. Slide the funnel into the funnel rails until it stops.  
6. Place the TEA/OFF/COFFEE switch in the desired position.  
7. Momentarily press the start switch.  
CAUTION – The funnel contains hot liquid. Remove funnel slowly.  
8. Carefully remove the brew funnel and discard its contents after liquid stops flowing from the funnel.  
9. Place the TEA/OFF/COFFEE switch in the “OFF” position to prevent a false start.  
10510 071000  
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 person-  
nel.  
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  
Problem  
Probable Cause  
Remedy  
Brew cycle(s) will not start  
1. No water  
Water lines and valves to the brewer  
must be open.  
2. No power or incorrect voltage to Check circuit breakers or fuses.  
the brewer  
3. External Strainer/ Flow Control (A) Direction of flow arrow must be  
(.750 GPM)  
pointing towards the brewer.  
(B) Remove the strainer/flow con-  
trol and check for obstructions.  
Clear or replace.  
4. TEA/OFF/COFFEE Switch  
5. Start Switch  
Refer to Service - TEA/OFF/COFFEE  
Switch for testing. See page 26  
Refer to Service - Start Switch for  
testing procedures. See page 27  
10510 071000  
Page 8  
TROUBLESHOOTING (cont.)  
PROBLEM  
PROBABLE CAUSE  
REMEDY  
Brew cycle(s) will not start (cont.)  
6. Brew Timer  
A) Iced Tea  
Refer to Service - Brew Timer (Iced  
Tea) for testing procedures. See  
page 20 or 21  
Refer to Service - Brew Timer (Hot  
Coffee) for testing procedures. See  
page 17 or 18  
B) Hot Coffee  
Refer to Service - Brew Solenoid  
Valve (Iced Tea) for testing proce-  
dures. See page 16  
7. Brew Solenoid Valve  
A) Iced Tea  
Refer to Service- Brew Solenoid  
Valve (Hot Coffee) for testing pro-  
cedures. See page 15  
B) Hot Coffee  
(A) Direction of flow arrow must be  
pointing towards brewer.  
8. Internal Flow control (.195 GPM)  
(Hot Coffee Only)  
(B) Remove the flow control and  
check for obstructions. Clear or re-  
place.  
Brew water is not hot  
Refer to Service - Limit Thermostat  
for testing procedures. See page 25  
1. Limit Thermostat  
CAUTION - Do not eliminate or by-  
pass limit thermostat. Use only  
BOM  
replacement  
part  
#29329.1000  
Refer to Service - Thermal fuse for  
testing procedures. See page 29  
2. Thermal Fuse  
CAUTION - Do not eliminate or by-  
pass thermal fuse.  
Refer to Service - Control Thermo-  
stat for testing procedures. See  
page 23  
3. Control Thermostat  
Refer to Service - Tank Heater for  
testing procedures. See page 28  
4. Tank Heater  
Dilution (Iced Tea) cycle will not  
start  
Refer to Service - TEA/OFF/COFFEE  
Switch for testing procedures. See  
page 26  
1. TEA/OFF/COFFEE Switch  
10510 071000  
Page 9  
TROUBLESHOOTING (cont.)  
PROBLEM  
PROBABLE CAUSE  
REMEDY  
Dilution (Iced Tea) cycle will not  
start (cont.)  
2. Start Switch  
Refer to Service - Start Switch for  
testing procedures. See page 27  
3. Brew Timer (Iced Tea)  
Refer to Service- Brew Timer (Iced  
Tea) for testing procedures. See  
page 20 or 21  
4. Brew Solenoid Valve (Iced Tea)  
5. Dilution Solenoid Valve  
Refer to Service - Brew Solenoid  
Valve (Iced Tea) for testing proce-  
dures. See page 16  
Refer to Service - Dilution Solenoid  
Valve for testing procedures. See  
page 24  
Inconsistent beverage level in dis- 1. Internal Flow Control (.195 GPM) (A) Direction of flow arrow must be  
penser (Hot Coffee)  
pointing towards the brewer.  
(B) Remove the flow control and  
check for obstruction. Clear or re-  
place.  
2. Syphon System  
3. Lime Build-up  
The brewer must be level or slightly  
lower in front to syphon properly.  
Inspect the tank assembly for ex-  
CAUTION - Tank and tank compo- cessive lime deposits. Delime as  
nents should be delimed regularly  
depending on local water condi-  
tions. Excessive mineral build-up  
on stainless steel surfaces can ini-  
tiate corrosive reactions resulting  
in serious leaks.  
required.  
4. Water Pressure  
The water pressure to the brewer  
must be at least 20 psi (128 kPa).  
Consistently high or low beverage 1. Brew Timer  
level in the dispenser  
With the TEA/OFF/COFFEE switch in  
the "TEA" position adjust the needle  
valve to achieve the recommended  
76 oz of concentrate then the timer  
to achieve a total of 396 oz for each  
three-gallon brew cycle.  
10510 071000  
Page 10  
TROUBLESHOOTING (cont.)  
PROBLEM  
REMEDY  
PROBABLE CAUSE  
Consistently high or low beverage  
level in the dispenser. (cont.)  
(A) Direction of flow arrow must be  
pointing towards brewer.  
2. External Strainer/Flow Control  
(.750 GPM)  
(B) Remove the strainer/flow con-  
trol and check for obstructions.  
Clear or replace.  
Spitting or excessive steaming  
Inspect tank assembly for excessive  
lime deposits. Delime as required.  
1. Lime Build-up  
CAUTION - Tank and tank compo-  
nents should be delimed regularly  
depending on local water condi-  
tions. Excessive mineral build-up  
on stainless steel surfaces can ini-  
tiate corrosive reactions resulting  
in serious leaks.  
Refer to Service - Control Thermo-  
stat for testing procedures. See  
page 23  
2. Control Thermostat  
Drip-out time too long  
The brew funnel should be cleaned  
thoroughly before each brew cycle  
to lessen the chance of tea leaf par-  
ticles clogging the drip-out tip.  
1. Funnel Tip  
Dripping from sprayhead  
The brewer must be level or slightly  
lower in front to syphon properly.  
1. Syphon System  
Inspect the tank assembly for ex-  
cessive lime deposits. Delime as  
required.  
2. Lime Build-up  
CAUTION - Tank and tank compo-  
nents should be delimed regularly  
depending on local water condi-  
tions. Excessive mineral build-up  
on stainless steel surfaces can ini-  
tiate corrosive reactions resulting  
in serious leaks.  
Refer to Service - Brew Solenoid  
Valve (Iced Tea) for testing proce-  
dures. See page 16  
3. Brew Solenoid Valve  
A) Iced Tea  
Refer to Service- Brew Solenoid  
Valve (Hot Coffee) for testing pro-  
cedures. See Page 15  
B) Hot Coffee  
10510 071000  
Page 11  
TROUBLESHOOTING (cont.)  
PROBLEM  
PROBABLE CAUSE  
REMEDY  
1. Brew Timer  
A) Iced Tea  
Water flows into tank continuously  
(TEA/OFF/COFFEE Switch in the  
"TEA or "COFFEE" position)  
Refer to Service - Brew Timer (Iced  
Tea) for testing procedures. See  
page 20 or 21  
B) Hot Coffee  
Refer to Service- Brew Timer (Hot  
Coffee) for testing procedures. See  
page 17 or 18  
1. Brew Solenoid Valve  
A) Iced Tea  
Water flows into tank continuously  
(TEA/OFF/COFFEE Switch in the  
"OFF" position)  
Refer to Service - Brew Solenoid  
Valve (Iced Tea) for testing proce-  
dures. See page 16  
B) Hot Coffee  
1. Dispenser  
Refer to Service- Brew Solenoid  
Valve (Hot Coffee) for testing pro-  
cedures. See page 15  
Beverage overflows dispenser  
The dispenser must be completely  
empty before starting a brew cycle.  
2. Brew Timer  
A) Iced Tea  
Refer to Service - Brew Timer (Iced  
Tea) for testing procedures. See  
page 20 or 21  
B) Hot Coffee  
Refer to Service- Brew Timer (Hot  
Coffee) for testing procedures. See  
page 17 or 18  
3. Brew Solenoid Valve  
A) Iced Tea  
Remove the Iced Tea Brew Solenoid  
Valve and clean any obstruction.  
Rebuild or replace the valve if nec-  
essary. See page 16  
B) Hot Coffee  
Remove the Hot Coffee Brew Sole-  
noid Valve and clean any obstruc-  
tion. Rebuild or replace the valve if  
necessary. See page 15  
4. Dilution Solenoid Valve  
Refer to Service - Dilution Solenoid  
Valve for testing procedures. See  
page 24  
10510 071000  
Page 12  
TROUBLESHOOTING (cont.)  
PROBLEM  
PROBABLE CAUSE  
REMEDY  
BUNN® paper filters must be used  
for proper extraction.  
Weak beverage  
1. Filter Type  
2. Tea or Coffee  
3. Sprayhead  
A sufficient quantity of fresh tea  
leaves or coffee should be used for  
proper extraction.  
A six-hole (or seven-hole for Mod-  
els with 90 oz concentrate option)  
stainless steel sprayhead must be  
used for proper extraction.  
The BUNN® paper filter must be cen-  
tered in the funnel and the bed of tea  
leaves leveled by gentle shaking.  
4. Funnel Loading  
Place an empty funnel on an empty  
dispenser beneath the sprayhead. Ini-  
tiate a brew cycle and check the wa-  
ter temperature immediately below  
the sprayhead with a thermometer.  
The reading should not be less than  
200°F(93°C). Adjust the control ther-  
mostat to increase the water tempera-  
ture. Replace if necessary.  
5. Water Temperature  
The BUNN® paper filter must be cen-  
tered in the funnel and the bed of  
grounds leveled by gently shaking.  
Dry tea leaves remain in the funnel  
Brewer is making unusual noises  
1. Funnel Loading  
1. Solenoid(s)  
The nut on the solenoid(s) must be  
tight or it will vibrate during opera-  
tion.  
Plumbing lines should not be rest-  
ing on the counter top.  
2. Plumbing Lines  
3. Water Supply  
(A) The brewer must be connected  
to a cold water line.  
(B) Water pressure to the brewer  
must not exceed 90 psi(620 kPa).  
Install a regulator if necessary to  
lower the working pressure to ap-  
proximately 50 psi(345 kPa).  
Remove and clean lime off the tank  
heater. See page 28  
4. Tank Heater  
10510 071000  
Page 13  
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 electri-  
cal 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 spe-  
cifically states to plug-in the brewer.  
COMPONENT ACCESS  
WARNING - Disconnect the brewer from the power  
source before the removal of any panel or the replace-  
ment 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.  
RemovalofthetopcoverwillallowaccesstoTEA/OFF/  
COFFEE switch, start switch, brew timers, control  
thermostat, limit thermostat, thermal fuse and tank  
heater.  
The rear inspection panel is attached with six #8-  
32 screws. Remove of the rear panel will allow access  
to the brew solenoid valves and the dilution solenoid  
valve .195 GPM flow control and check valve.  
P1959.60  
FIG. 1 COMPONENT ACCESS  
Contents  
Brew Solenoid Valve (Hot Coffee) ....................... 15  
Brew Solenoid Valve (Iced Tea) .......................... 16  
Brew Timer (Hot Coffee- Early Models) .............. 17  
Digital Brew Timer (Hot Coffee-Late Models) ..... 18  
Brew Timer (Iced Tea - Early Models) ................. 20  
Digital Brew Timer (Iced Tea-Late Models) ......... 21  
Control Thermostat............................................. 23  
Dilution Solenoid Valve ....................................... 24  
Limit Thermostat ................................................ 25  
TEA/OFF/COFFEE Switch ..................................... 26  
Start Switch ........................................................ 27  
Tank Heater......................................................... 28  
Thermal Fuse ...................................................... 29  
Half Batch Switch (Optional)............................... 30  
Wiring Diagrams................................................. 31  
10510 071000  
Page 14  
SERVICE (cont.)  
If continuity is not present as described, replace the  
solenoid valve.  
BREW SOLENOID VALVE (HOT COFFEE)  
6. Check the hot coffee solenoid valve for coil ac-  
tion. Connect the brewer to the power source. With  
TEA/OFF/COFFEE switch in the "COFFEE" 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.  
If the sound is heard as described and water will not  
pass through the solenoid valve, there may be a block-  
age 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.  
P2198.50  
Removal and Replacement:  
FIG. 2 HOT COFFEE BREW SOLENOID VALVE  
Location:  
Viewing the brewer from the, rear the hot coffee  
brew solenoid valve is mounted on the left side of the  
mounting bracket.  
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 sole-  
noid 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 hold-  
ing the hot coffee solenoid valve to the mounting  
bracket.  
7. Securely install the new hot coffee solenoid valve  
to the mounting bracket.  
Test Procedures:  
1. Disconnect the brewer from the power source.  
2. Disconnect the white/red and white/green wires  
from the hot coffee solenoid valve. With the TEA/  
OFF/COFFEE switch in the "COFFEE" position press  
the START switch.  
3. With a voltmeter, check the voltage across the  
white/red and white/green wires. Connect the  
brewer to the power source. The indication must  
be 120 volts ac for two wire 120 volt models and  
three wire 120/208 volt models.  
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. 3 when reconnecting the wires.  
WHI/GRN to Hot Coffee Timer TL4  
WHI/RED to Hot Coffee Timer TL1  
4. Disconnect the brewer from the power source.  
If voltage is present as described, proceed to #5  
If voltage is not present as described, refer to Wiring  
Diagrams and check brewer wiring harness.  
HOT COFFEE  
BREW SOLENOID  
5. Check for continuity across the hot coffee sole-  
noid valve coil terminals.  
ICED TEA BREW  
SOLENOID  
If continuity is present as described, reconnect the  
white/red and white/green wires from the hot coffee  
brew timer.  
DILUTION  
SOLENOID  
P1364  
FIG.3 SOLENOID VALVE TERMINALS  
10510 081599  
Page 15  
SERVICE (cont.)  
If continuity is not present as described, replace the  
solenoid valve.  
BREW SOLENOID VALVE (ICED TEA)  
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 vicin-  
ity of the solenoid valve for a "clicking" sound as  
the coil magnet attracts.  
7. Disconnect the brewer from the power source.  
If the sound is heard as described and water will not  
pass through the solenoid valve, there may be a block-  
age 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.  
P2198.50  
Removal and Replacement:  
FIG. 4 ICED TEA BREW SOLENOID VALVE  
Location:  
Viewingthebrewerfromtherear,theicedteabrew  
solenoid valve is mounted in the center of the mount-  
ing bracket.  
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 sole-  
noid 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 hold-  
ing the iced tea brew solenoid valve to the mount-  
ing bracket.  
7. Securely install the new iced tea brew solenoid  
valve to the mounting bracket.  
Test Procedures:  
1. Disconnect the brewer from the power source.  
2. Disconnect the white/violet and white/blue wires  
from the iced tea brew solenoid valve. With the  
TEA/OFF/COFFEE switch in the "TEA" position press  
the START switch.  
3. With a voltmeter, check the voltage across the  
white/violet and white/blue wires. Connect the  
brewer to the power source. The indication must  
be 120 volts ac for two wire 120 volt models and  
three wire 120/208 volt models.  
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.  
4. Disconnect the brewer from the power source.  
WHI/BLU to Dilution  
Solenoid  
WHI/VIO to Dilution  
Solenoid  
If voltage is present as described, proceed to #5  
If voltage is not present as described, refer to Wiring  
Diagrams and check brewer wiring harness.  
HOT COFFEE  
BREW SOLENOID  
5. Check for continuity across the iced tea brew so-  
lenoid valve coil terminals.  
ICED TEA BREW  
SOLENOID  
If continuity is present as described, reconnect the  
white/violet and white/blue wires from the iced tea  
brew timer.  
DILUTION  
SOLENOID  
P1364  
FIG.5 SOLENOID VALVE TERMINALS  
10510 081599  
Page 16  
SERVICE (cont.)  
If continuity is not present as described, refer to the  
Wiring Diagrams and check the wiring harness.  
BREW TIMER (HOT COFFEE- Early Models)  
5. With a voltmeter, check the voltage across termi-  
nals TL1 and TL4 when the TEA/OFF/COFFEE  
switch is in the “COFFEE” position and the START  
switch is momentarily placed in the lower posi-  
tion. Connect the brewer to the power source.  
The indication must be 120 volts ac for two wire  
120 volt models and three wire 120/208 volt mod-  
els for approximately twenty seconds and then re-  
turn to its previous indication.  
6. Disconnect the brewer from the power source.  
If voltage is present as described, the timer is operat-  
ing properly. Adjust the timer dial as required.  
If voltage is not present as described, replace the timer.  
Removal and Replacement:  
1. Remove all wires from the timer.  
P1961.60  
2. Remove the circuit board and dial plate from the  
brackets.  
FIG. 6 HOT COFFEE BREW TIMER  
Location:  
The hot coffee brew timer is located in the hood on  
theleftside. Itconsistsofadialplateandcircuitboard.  
3. Install the new timer circuit board as described in  
Late Model Timer section on the following pages.  
4. Refer to Fig. 9 when reconnecting the wires.  
5. Install the Timer Setting decal, provided with the  
replacement timer kit, to the rear of the schematic,  
on the top cover.  
Test Procedure:  
1. Disconnect the brewer from the power source.  
2. Remove the wires from terminals TL3, TL4, & TL5  
of the timer and rotate the dial fully counterclock-  
wise.  
6. Adjust the timer as required. Refer to Late Model  
Timer section on the following pages.  
2. With a voltmeter, check the voltage across termi-  
nals TL1 and TL2 when the TEA/OFF/COFFEE  
switch is in the “COFFEE” position. Connect the  
brewer to the power source. The indication must  
be 120 volts ac for two wire 120 volt models and  
three wire 120/208 volt models.  
WHI to Power Cord (120V Models)  
or WHI to Terminal Block (120/208V  
Models)  
WHI/RED to Hot Coffee Solenoid  
WHI/RED to TEA/OFF/COFFEE Switch  
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 Wir-  
ing Diagrams and check the wiring harness.  
4. Check for continuity across the white/orange and  
white/yellow wires when the START switch is held  
in the lower position.  
WHI/YEL to START Switch  
WHI/GRN to Hot Coffee  
Solenoid  
If continuity is present as described, reconnect the  
wires to terminals TL3, TL4, & TL5 of the timer board  
and proceed to #5.  
P1962  
WHI/ORA to START Switch  
OLD STYLE  
FIG. 7 HOT COFFEE BREW TIMER TERMINALS  
10510 071000  
Page 17  
SERVICE (cont.)  
DIGITAL BREW TIMER (HOT COFFEE -Late Models)  
6. With a voltmeter, check the voltage across termi-  
nals TL1 and TL4 when the "TEA/OFF/COFFEE"  
switch is in the "COFFEE" position. Connect the  
brewer to the power source. The indication must  
be 0 volts.  
If voltage is as described, proceed to #7.  
If voltage is not as described, disconnect the brewer  
from the power source and replace the timer.  
7. With a voltmeter, check the voltage across termi-  
nals TL1 and TL4 when the "TEA/OFF/COFFEE"  
switch is in the "COFFEE" position. Connect the  
brewer to the power source and press the START  
switch. Theindicationmustbe120voltsacfortwo  
wire 120 volt models and three wire 120/208 volt  
models.  
P2198.50  
FIG. 8 DIGITAL BREW TIMER  
Location:  
If voltage is present as described, the brew timer is  
operating properly. Reset the timer as required, to  
obtain the desired brew volume.  
If voltage is not present as described, disconnect the  
brewer from the power source and replace the timer.  
Thetimerislocatedinsidethehoodontheleftside.  
Test Procedure.  
NOTE:Donotremoveorinstallwireswhiletimerboard  
is installed. Pressure applied to one side may cause  
damage to the board.  
1. Disconnect the brewer from the power source and  
remove the front access panel.  
2. Remove the two #8-32 screws securing circuit  
board to the mounting bracket.  
3. Remove circuit board and spacers (as required).  
4. With a voltmeter, check the voltage across termi-  
nals TL1 and TL2 when the "TEA/OFF/COFFEE"  
switch is in the "COFFEE" position. Connect the  
brewer to the power source. The indication must  
be 120 volts ac for two wire 120 volt models and  
three wire 120/208 volt models.  
Removal and Replacement:  
1. Remove the two #8-32 screws securing circuit  
board to the mounting bracket.  
2. Remove circuit board and spacers (as required).  
3. Remove all wires from the timer.  
4. Attach all wires to the replacement timer board  
prior to installation to the component mounting  
bracket. Refer to FIG. 9 when reconnecting the  
wires.  
5. Install new circuit board with spacers (as re-  
quired) to the component mounting bracket.  
6. Adjust the timer as described below.  
5. Disconnect the brewer from the power source.  
Timer Setting:  
If voltage is present as described, proceed to #6.  
If voltage is not present as described, refer to the  
Wiring Diagrams and check the brewer wiring har-  
ness.  
NOTE: Prior to setting or modifying volumes, check  
that the brewer is connected to water supply, the tank  
is properly filled, and a funnel and server are in place.  
NOTE: All volume settings must be done with the  
sprayhead installed.  
10510 071000  
Page 18  
SERVICE (cont.)  
DIGITAL BREW TIMER (HOT COFFEE - Late  
Models)(cont.)  
ume setting will remain in memory.)  
View the level of the liquid being dispensed. When  
the desired level is reached, turn the TEA/OFF/COF-  
FEE switch to “OFF”.  
NOTE: Several ounces of water will continue to sy-  
phon from the tank after turning the switch “OFF”.  
The brewer remembers this volume and will continue  
to brew batches of this size until the volume setting  
procedure is repeated.  
1. Modifying brew volumes. To modify a brew vol-  
ume, first check that the SET/LOCK switch is in the  
“SET” position on the circuit board.  
To increase a brew volume, place the TEA/OFF/  
COFFEE switch in the “COFFEE” position, press and  
hold the START switch until three clicks are heard.  
Release the switch and press it again one or more  
times. (Failure to release the switch within two sec-  
onds after the third click causes the volume setting to  
be aborted and previous volume setting will remain in  
memory.) Each time the switch is pressed, two sec-  
onds are added to the brew time period. Allow the  
brew cycle to finish in order to verify that the desired  
volume has been achieved.  
NOTE: When brewing coffee, volume will decrease due  
to absorption by the coffee grounds.  
3. Setting programming disable feature. If it be-  
comes necessary to prevent anyone from changing  
brew time once programmed, you can set the SET/  
LOCK switch to the “LOCK” position. This will pre-  
vent any further programming until switch is once  
again put into the “SET” position.  
To decrease a brew volume, place the TEA/OFF/  
COFFEE switch in the “COFFEE” position, press and  
release the START switch once for every two-second  
interval to be removed from the total brew time pe-  
riod; then immediately press and hold down the START  
switch until three clicks are heard. Release the switch.  
(Failure to release the switch within two seconds af-  
ter 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 brew volumes. To set a brew volume,  
first check that the SET/LOCK switch is in the “SET”  
position on the circuit board. Place the TEA/OFF/COF-  
FEE switch in the “COFFEE” position, press and hold  
the START 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 vol-  
TL1 - WHI/RED to Hot Coffee Solenoid and  
WHI/RED to TEA/OFF/COFFEE Switch  
TL2 - WHI to Power Cord (120V Models) or  
WHI to Terminal Block (120/208V Models)  
TL3 - WHI/ORN to START Switch  
TL4 - WHI/GRN to Hot Coffee Solenoid  
TL5 - WHI/YEL to START Switch  
P2037  
FIG. 9 DIGITAL TIMER WIRING  
10510 071000  
Page 19  
SERVICE (cont.)  
BREW TIMER (ICED TEA - Early Models)  
5. With a voltmeter, check the voltage across termi-  
nals TL1 and TL4 when the TEA/OFF/COFFEE  
switch is in the “TEA” position and the START  
switch is momentarily placed in the lower posi-  
tion. Connect the brewer to the power source. The  
indication must be 120 volts ac for two wire 120  
volt models and three wire 120/208 volt models  
for approximately twenty seconds and then return  
to its previous indication.  
6. Disconnect the brewer from the power source.  
If voltage is present as described, the timer is operat-  
ing properly. Adjust the timer dial as required.  
If voltage is not present as described, replace the timer.  
P1961.50  
Removal and Replacement:  
1. Remove all wires from the iced tea brew timer.  
2. Remove the circuit board and dial plate from the  
brackets.  
3. Install the new timer circuit board as described in  
Late Model Timer section on the following pages.  
4. Refer to Fig. 13 when reconnecting the wires.  
5. Install the Timer Setting decal, provided with the  
replacement timer kit, to the rear of the schematic  
on the top cover.  
FIG. 10 ICED TEA BREW TIMER  
Location:  
The iced tea brew timer is located in the hood on  
the right side. It consists of the dial plate and circuit  
board.  
Test Procedure:  
1. Disconnect the brewer from the power source.  
2. Remove the wires from terminals TL3, TL4, & TL5  
of the iced tea timer and rotate the dial fully coun-  
terclockwise.  
5. Adjust the timer as required. Refer to Late Model  
Timer section on the following pages.  
2. With a voltmeter, check the voltage across termi-  
nals TL1 and TL2 when the TEA/OFF/COFFEE  
switch is in the “TEA” position. Connect the brewer  
to the power source. The indication must be 120  
volts ac for two wire 120 volt models and three  
wire 120/208 volt models.  
WHI to Power Cord (120V Models)  
or WHI to Terminal Block (120/208V  
Models)  
WHI/VIO to Iced Tea Solenoid  
WHI/VIO to TEA/OFF/COFFEE Switch  
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 Wir-  
ing Diagram and check the wiring harness.  
4. Check for continuity across the orange and yel-  
low wires when the START switch is held in the  
lower position.  
If continuity is present as described, reconnect the  
wires to terminals TL3, TL4, & TL5 of the timer board  
and proceed to #5.  
YEL to START Switch  
WHI/BLU to Iced Tea Solenoid  
ORN to START Switch  
P1962  
EARLY MODELS  
If continuity is not present as described, refer to the  
Wiring Diagrams and check the wiring harness.  
FIG. 11 ICED TEA BREW TIMER TERMINALS  
10510 071000  
Page 20  
SERVICE (cont.)  
6. With a voltmeter, check the voltage across termi-  
nals TL1 and TL4 when the "TEA/OFF/COFFEE"  
switch is in the "TEA" position. Connect the brewer  
to the power source. The indication must be 0  
volts.  
DIGITAL BREW TIMER (ICED TEA - Late Models)  
If voltage is as described, proceed to #7.  
If voltage is not as described, disconnect the brewer  
from the power source and replace the timer.  
7. With a voltmeter, check the voltage across termi-  
nals TL1 and TL4 when the "TEA/OFF/COFFEE"  
switch is in the "TEA" position. Connect the brewer  
to the power source and press the START switch.  
The indication must be 120 volts ac for two wire  
120 volt models and three wire 120/208 volt  
models.  
P2198.50  
If voltage is present as described, the brew timer is  
operating properly. Reset the timer as required, to  
obtain the desired brew volume.  
If voltage is not present as described, disconnect the  
brewer from the power source and replace the timer.  
FIG. 12 DIGITAL BREW TIMER  
Location:  
The timer is located inside the hood, on the right  
side.  
Test Procedure.  
Removal and Replacement:  
1. Remove the two #8-32 screws securing circuit  
board to the mounting bracket.  
2. Remove circuit board and spacers (as required).  
3. Remove all wires from the timer.  
4. Attach all wires to the replacement timer board  
prior to installation to the component mounting  
bracket. Refer to FIG. 13 when reconnecting the  
wires.  
NOTE:Donotremoveorinstallwireswhiletimerboard  
is installed. Pressure applied to one side may cause  
damage to the board.  
1. Disconnect the brewer from the power source and  
remove the front access panel.  
2. Remove the two #8-32 screws securing circuit  
board to the hood.  
3. Remove circuit board and spacers (as required).  
4. With a voltmeter, check the voltage across termi-  
nals TL1 and TL2 when the "TEA/OFF/COFFEE"  
switch is in the "TEA" position. Connect the brewer  
to the power source. The indication must be 120  
volts ac for two wire 120 volt models and three  
wire 120/208 volt models.  
5. Install new circuit board with spacers (as re-  
quired) to the component mounting bracket.  
6. Adjust the timer as described below.  
Timer Setting:  
NOTE: Prior to setting or modifying volumes, check  
that the brewer is connected to water supply, the tank  
is properly filled, and a funnel and server are in place.  
NOTE: All volume settings must be done with the  
sprayhead installed.  
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 Diagrams and check the brewer wiring har-  
ness.  
10510 071000  
Page 21  
SERVICE (cont.)  
NOTE: Several ounces of water will continue to sy-  
phon from the tank after turning the switch “OFF”.  
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, volume will decrease due  
to absorption by the coffee grounds.  
DIGITAL BREW TIMER (ICED TEA - Late  
Models)(cont.)  
1. Modifying brew volumes. To modify a brew vol-  
ume, first check that the SET/LOCK switch is in the  
“SET” position on the circuit board.  
To increase a brew volume, place the TEA/OFF/  
COFFEE switch in the “TEA” position, press and hold  
the START switch until three clicks are heard. Release  
the switch and press it again one or more times. (Fail-  
ure 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.)  
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.  
3. Setting programming disable feature. If it be-  
comes necessary to prevent anyone from changing  
brew time once programmed, you can set the SET/  
LOCK switch to the “LOCK” position. This will pre-  
vent any further programming until switch is once  
again put into the “SET” position.  
To decrease a brew volume, place the TEA/OFF/  
COFFEE switch in the “TEA” position, press and re-  
lease the START switch once for every two-second  
interval to be removed from the total brew time pe-  
riod; then immediately press and hold down the START  
switch until three clicks are heard. Release the switch.  
(Failure to release the switch within two seconds af-  
ter 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 brew volumes. To set a brew volume,  
first check that the SET/LOCK switch is in the “SET”  
position on the circuit board. Place the TEA/OFF/COF-  
FEE switch in the “TEA” position, press and hold the  
START 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.)  
TL1 - WHI/VIO to Iced Tea Solenoid and  
WHI/VIO to TEA/OFF/COFEE Switch  
TL2 - WHI to Power Cord (120V Models) or  
WHI to Terminal Block (120/208V Models)  
TL3 - ORN to START Switch  
TL4 - WHI/BLU to Iced Tea Solenoid  
TL5 - YEL to START Switch  
P2037  
View the level of the liquid being dispensed. When  
the desired level is reached, turn the TEA/OFF/COF-  
FEE switch to “OFF”.  
FIG. 13 DIGITAL TIMER WIRING  
10510 071000  
Page 22  
SERVICE (cont.)  
8. Disconnect the brewer from the power source.  
CONTROL THERMOSTAT  
If voltage is present as described, reinstall the capil-  
lary tube into the tank to the line 4.5" above the bulb,  
the control thermostat is operating properly.  
If voltage is not present as described, replace the ther-  
mostat.  
Removal and Replacement:  
1. Remove both wires from the control thermostat  
terminals.  
2. Remove the thermostat capillary bulb by firmly  
pulling up on the capillary tube at the tank lid. This  
will disengage the grommet from the tank lid.  
3. Remove the #8-32 screw holding the control ther-  
mostat to its bracket.  
4. Slide the grommet to the line 4.5" above the bulb  
on the new capillary tube.  
P2198.50  
FIG. 14 CONTROL THERMOSTAT  
Location:  
5. Insert the capillary bulb through the hole in the  
tank lid and press the grommet firmly and evenly  
so that the groove in the grommet fits into the  
tank lid.  
The control thermostat is located inside hood on  
the right side to the left of the iced tea brew timer.  
Test Procedures:  
6. Carefully bend the capillary tube so that the tube  
and bulb inside the tank are in a vertical position.  
1. Disconnect the brewer from the power source.  
2. With a voltmeter, check the voltage across the blue  
wire on the control thermostat and the white wire  
on the tank heater for 120 volt two wire models or  
red wire on the tank heater for 120/208 volt three  
wire models. Connect the brewer to the power  
source. The indication must be 120 volts ac for  
two wire 120 volt models and 208 volts ac for  
three wire 120/208 volt models.  
NOTE – The capillary tube must be clear of any elec-  
trical termination and not kinked.  
7. Fasten the new control thermostat to its bracket.  
8. Refer to Fig. 15 when reconnecting the wires.  
9. Adjust the control thermostat as required.  
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 Wir-  
ing Diagrams and check the brewer wiring harness.  
F
HI  
F
O F F  
N
N
U
B U N N  
4. Locate the black wire on the control thermostat.  
5. Gently remove the capillary bulb and grommet  
from the tank.  
6. With a voltmeter, check the voltage across the  
black wire of the control thermostat and the white  
wire on the tank heater for 120 volt two wire mod-  
els or red wire on the tank heater for 120/208 volt  
three wire models when the control thermostat is  
turned fully clockwise. Connect the brewer to the  
power source. The indication must be 120 volts  
ac for two wire 120 volt models and 208 volts ac  
for three wire 120/208 volt models.  
BLK to Tank Heater or  
Thermal Fuse on Models  
W/Faucet  
BLU to Limit Thermostat  
P1390  
FIG. 15 CONTROL THERMOSTAT TERMINALS  
10510 081599  
Page 23  
SERVICE (cont.)  
5. Check the solenoid valve for coil action. Connect  
the brewer to the power source, place the TEA/  
OFF/COFFEE switch in the “TEA” position and mo-  
mentarily place the START switch in the lower po-  
sition and release. Listen carefully in the vicinity  
of the solenoid valve for a “clicking” sound as the  
coil magnet attracts.  
DILUTION SOLENOID VALVE  
6. Disconnect the brewer from the power source.  
If the sound is heard as described and water will not  
pass through the solenoid valve, there may be a block-  
age in the water line before or after 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.  
Removal and Replacement:  
P2198.50  
1. Remove all wires from the solenoid valves.  
2. Turn off the water supply to the brewer.  
3. Disconnect the water lines to and from the sole-  
noid valves.  
4. Remove the two #8-32 keps nuts holding the  
mounting bracket to the trunk base.  
FIG. 16 DILUTION SOLENOID VALVE  
Location:  
Viewing the brewer from the rear the dilution so-  
lenoid is mounted on the right side of the solenoid  
mounting bracket which is secured to the trunk base.  
5. Lift out the bracket.  
6. Remove the two #10-32 slotted-head screws hold-  
ing the solenoid valve to the mounting bracket.  
7. Securely install the new solenoid valve to the  
mounting bracket.  
8. Attach the mounting bracket to the trunk base.  
9. Securely fasten the water lines to and from the  
solenoid valves.  
Test Procedure:  
1. Disconnect the brewer from the power source.  
2. With a voltmeter, check the voltage across the  
white/blue and white/violet wires on the dilution  
solenoid terminals when the TEA/OFF/COFFEE  
switch is in the “TEA” position and the START  
switch is momentarily placed in the lower posi-  
tion. Connect the brewer to the power source.  
The indication must be 120 volts ac for two wire  
120 volt models and three wire 120/208 volt mod-  
els.  
10. Refer to Fig. 17 when reconnecting the wires.  
WHI/BLU to Iced  
Tea Brew Timer  
TL4  
3. Disconnect the brewer from the power supply.  
If voltage is present as described, proceed to #4.  
If voltage is not present as described, refer to the Wir-  
ing Diagrams and check the wiring harness.  
WHI/VIO to Iced  
Tea Brew Timer  
TL1  
HOT COFFEE  
BREW SOLENOID  
4. Remove both wires from the coil and check for  
continuity across the coil terminals.  
ICED TEA BREW  
SOLENOID  
If continuity is present as described, reconnect the  
white/blue and white/violet wires and proceed to #5.  
If continuity is not present as described, replace the  
solenoid valve.  
DILUTION  
SOLENOID  
P1364  
FIG.17 SOLENOID VALVE TERMINALS  
10510 081599  
Page 24  
SERVICE (cont.)  
LIMIT THERMOSTAT  
5. With a voltmeter, check the voltage across the ex-  
posed terminal of the limit thermostat and the  
white wire from the power cord or the red wire  
from the terminal block. Connect the brewer to  
the power source. The indication must be:  
a) 120 volts ac for two wire 120 volt models.  
b) 208 volts ac for three wire 120/208 volt mod-  
els.  
6. Disconnect the brewer from the power source.  
If voltage is present as described, reconnect the blue  
wire to the limit thermostat. The limit thermostat is  
operating properly.  
If voltage is not present as described, replace the limit  
thermostat.  
Removal and Replacement  
1. Remove both wires from the limit thermostat ter-  
minals.  
2. Carefully slide the limit thermostat out from un-  
der the retaining clip.  
3. Carefully slide the new limit thermostat into the  
retaining clip.  
P2198.50  
FIG. 18 LIMIT THERMOSTAT  
Location:  
The limit thermostat is located inside the hood on  
the tank lid.  
4. Refer to Fig. 19 when reconnecting the wires.  
Test Procedure:  
1. Disconnect the brewer from the power source and  
remove the black wire from the limit thermostat.  
2. With a voltmeter, check the voltage across the  
black wire removed from the limit thermostat and  
the white or red wire on the tank heater terminal.  
Connect the brewer to the power source. The in-  
dication must be:  
BLU to Control  
Thermostat  
a) 120 volts ac for two wire 120 volt models.  
b) 208 volts ac for three wire 120/208 volt mod-  
els.  
3. Disconnect the brewer from the power source.  
BLK to Power Cord  
or Terminal Block  
If voltage is present as described, reconnect the black  
wire and proceed to #4.  
P1800  
If voltage is not present as described, refer to the Wir-  
ing Diagrams and check the wiring harness.  
FIG. 19 LIMIT THERMOSTAT TERMINALS  
4. Remove the blue wire from the limit thermostat.  
10510 081599  
Page 25  
SERVICE (cont.)  
TEA/OFF/COFFEE SWITCH  
If voltage is present as described, proceed to #6.  
If voltage is not present as described, refer to the Wir-  
ing Diagrams and check the wiring harness.  
6. Check for continuity across the center and left ter-  
minals 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” posi-  
tion.  
If continuity is present as described, replace the wires,  
the switch is operating properly.  
If continuity is not present as described, replace the  
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. 21 when reconnecting the wires.  
P1959.60  
FIG. 20 TEA/OFF/COFFEE SWITCH  
BLK to Limit Thermostat  
WHI/VIO to Tea  
Location:  
WHI/RED to Coffee  
Brew Timer TL1  
Brew Timer TL1  
The TEA/OFF/COFFEE switch is located in the front  
of the hood, above and to the left of the brew funnel.  
Test Procedure:  
1. Disconnect the brewer from the power source.  
2. Remove the black, white/violet and white/red  
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 wire remaining on the switch  
terminal.  
4. Connect the brewer to the power source. The in-  
dication must be 120 volts ac for two wire 120  
volt models and three wire 120/208 volt models,  
5. Disconnect the brewer from the power source.  
WHI to Tea Brew  
Timer TL2  
P1367  
FIG.21 TEA/OFF/COFFEE SWITCH TERMINALS  
10510 081599  
Page 26  
SERVICE (cont.)  
START SWITCH  
4. 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.  
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. 23 when reconnecting the wires.  
WHI/ORN to  
Coffee Brew  
Timer TL3  
ORN to Iced Tea  
Brew Timer TL3  
P1959.60  
FIG. 22 START SWITCH  
Location:  
The start switch is located in the front of the hood,  
above and to the right of the brew funnel.  
YEL to Iced  
Tea Brew  
Timer TL5  
WHI/YEL to  
Coffee Brew  
Timer TL5  
Test Procedure:  
1. Disconnect the brewer from the power source.  
2. Remove the wires from all four terminals.  
3. Check for continuity across the two terminals on  
the right side of the switch when it is held in the  
lower position. Continuity must not be present  
across these terminals in the upper position.  
P1368  
FIG. 23 START SWITCH TERMINALS  
If continuity is present as described, proceed to #4.  
If continuity is not present as described, replace the  
switch.  
10510 081599  
Page 27  
SERVICE (cont.)  
TANK HEATER  
Removal and Replacement:  
1. Disconnect the black wire and the white or red  
wire from the tank heater terminals.  
2. Remove sprayhead and the hex nut securing the  
sprayhead tube to the hood. Set aside for reas-  
sembly.  
3. Disconnect vent tube.  
4. Disconnect and remove the faucet tube.  
5. Remove the eight #8-32 nuts securing the tank  
lid to the tank.  
6. Remove the tank lid with limit thermostat, spray-  
head tube, faucet tube, tank heater and vent tube.  
7. Remove the two hex nuts securing the tank heater  
to the tank lid. Remove tank heater with gaskets  
and discard.  
8. Install new tank heater with gaskets on the tank  
lid and secure with two hex nuts.  
P2198.50  
FIG. 24 TANK HEATER  
9. Install tank lid with limit thermostat, sprayhead  
tube, tank heater, faucet tube and vent tube using  
eight #8-32 nuts.  
10. Secure sprayhead tube to hood using a hex nut.  
11. Install sprayhead.  
12. Connect vent tube to fitting.  
13. Connect the faucet tube.  
14. Reconnect the wires to the limit thermostat and  
tank heater. See limit thermostat section in this  
manual when reconnecting wires.  
15. Refer to Fig. 25 when reconnecting the tank heater  
wires.  
Location:  
The tank heater is located inside the tank and se-  
cured 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 on 120 volt models or the  
black and red wires for 120/208 volt models. Con-  
nect the brew to the power source. The indication  
must be:  
a) 120 volts ac for two wire 120 volt models .  
b) 208 volts ac for three wire 120/208 volt mod-  
els.  
BLK to Control  
Thermostat or  
Thermal Fuse  
WHI to Power Cord  
(120V Models) or  
RED to Terminal  
Block (120/208V  
Models)  
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 Wir-  
ing Diagrams and check wiring harness.  
4. Disconnect the black wire and the white wire or  
red wire from the tank heater terminals.  
5. Check for continuity across the tank heater termi-  
nals.  
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, re-  
move and inspect heater for cracks in the sheath.  
P1369  
FIG. 25 TANK HEATER TERMINALS  
10510 081599  
Page 28  
SERVICE (cont.)  
THERMAL FUSE (Models W/Faucet Only)  
Removal and Replacement:  
1. Disconnect the thermal fuse from the right tank  
heater terminal and the black lead from the con-  
trol thermostat.  
2. Remove thermal fuse and discard.  
3. Connect new thermal fuse to the right tank heater  
terminal and the black lead from the control ther-  
mostat  
4. Refer to Fig. 27 when reconnecting wires.  
BLK Lead from  
Control Thermostat  
Thermal Fuse  
I
HI  
H
F
F
O F F  
O
N
N
B U N N  
U
B
P2198.50  
FIG. 26 THERMAL FUSE  
Location:  
The thermal fuse is located inside the hood con-  
nected to the right tank heater terminal.  
Tank Heater Terminals  
Test Procedures:  
P1393  
1. Disconnect the brewer from the power source.  
2. Disconnect the thermal fuse from the right tank  
heater terminal and the black lead from the con-  
trol thermostat.  
FIG. 27 THERMAL FUSE THERMINALS  
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.  
10510 081599  
Page 29  
SERVICE (cont.)  
HALF BATCH SWITCH (Optional)  
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. 29 when reconnecting the wires.  
GRY to Iced Tea  
Brew Timer  
PNK to Iced Tea  
Brew Timer  
P1038  
P1959.60  
FIG.29 HALF BATCH SWITCH TERMINALS  
FIG. 28 HALF BATCH SWITCH  
Location:  
The HALF BATCH switch is located in the front of  
the hood, above and to the far left of the brew funnel.  
Test Procedure:  
1. Disconnect the brewer from the power source.  
2. With an ohmmeter, check for continuity between  
the two terminals of the switch.  
If continuity is present as described, the switch is  
operating properly.  
If continuity is not present as described, replace the  
switch.  
10510 081599  
Page 30  
10510 081599  
Page 31  
READY INDICATOR  
BLU  
BLK  
10510 112000  
Page 32  

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