Bunn Coffeemaker STF User Manual

S,SA  
ST,STA  
STF,STFA  
®
BUNN  
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is no longer current.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  
PHONE: (217) 529-6601 FAX: (217) 529-6644  
29251.0000G 04/01 ©1998 Bunn-O-Matic Corporation  
USER NOTICES (Continued)  
#00882.0000  
#00656.0000  
#02763.0000  
#02765.0000  
#02769.0000  
29251 101598  
Page 3  
ELECTRICAL REQUIREMENTS  
CAUTION - The brewer must be disconnected from the power source until specified in Initial Set-Up.  
Model 15 has an attached cordset and requires 2-wire grounded service rated 120 volts ac, 15 amp, single  
phase, 60 Hz.  
L2 RED  
WHITE  
WHITE  
120V A.C.  
WHITE  
NEUTRAL  
L1 BLACK  
208 or  
NEUTRAL  
L1 BLACK  
100V.A.C.  
120V.A.C.  
P2185  
240V.A.C.  
120V A.C.  
NEUTRAL  
L1 BLACK  
P1841  
P2185  
P2193  
Model 20 requires 2-  
Model 35 requires 3-  
“A" & "B” models re-  
"SDBmodelrequires  
wire, grounded service wire, grounded service quire 2-wire, grounded 2-wire, grounded service  
rated 120 volts ac, 20 rated120/208or120/240 service rated 200 volts ac rated 100 volts ac, 20  
amp, single phase, 60 Hz. volts ac, 20 amp, single  
or 240 volts ac, 20 amp, amp, single phase, 50 Hz.  
phase, 60 Hz. Proceed as single phase, 50 Hz. Pro- Proceed as follows:  
follows: ceed as follows:  
Proceed as follows:  
Electrical Hook-Up  
CAUTION – Improper electrical installation will damage electronic components.  
1. An electrician must provide electrical service as specified.  
2. Using a voltmeter, check the voltage and color coding of each conductor at the electrical source.  
3. Before electrically connecting the brewer, remove the front and rear panel and rotate the thermostat knob fully  
counterclockwise to the "OFF" position. Keep this knob in the "OFF" position until performing the "Initial Set-Up"  
4. Feed the power cord through the strain relief and connect it to the terminal block.  
5. Connect the brewer to the power source and verify the voltage at the terminal block before proceeding.  
(Models S and ST-15 have cord attached. Replace all panels.  
6. If plumbing is to be hooked-up later be sure the brewer is disconnected from the power source. If plumbing  
has been hooked-up, the brewer is ready for "Initial Set-Up".  
NOTE: Schematic wiring diagrams are included in this manual.  
PLUMBING REQUIREMENTS  
Models S & SA:  
These models are completely portable and require no attached plumbing.  
Models ST, STA, STF & STFA  
These brewers must be connected to a cold water system with operating pressure between 20 and 90 psi (138  
1
and620kPa)froma 2"orlargersupplyline. Ashut-offvalveshouldbeinstalledinthelinebeforethebrewer. 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  
1
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.  
This equipment must be installed to comply with the Basic Plumbing Code of the Building  
OfficialsandCodeAdministratorsInternational, Inc. (BOCA)andtheFoodServiceSanitation  
Manual of the Food and Drug Administration (FDA).  
29251 011800  
Page 4  
INITIAL SET-UP  
CAUTION - The brewer must be disconnected from the power source throughout the initial set-up, except when  
specified in the instructions.  
1. Insert an empty funnel into the funnel rails.  
2. Place an empty dispenser under the funnel.  
3. Remove the front or rear panel and turn the thermostat knob to the “OFF” position and connect the brewer  
to the power source.  
4. Fill the tank with water as directed:  
4A. Models S & SA:  
Pourthreepitchersoftapwaterintothescreenedareaontopofthebrewer. Allowapproximatelytwominutes  
between pitchers for water to flow into the tank. While the third pitcher of water is entering the tank, the tank  
will fill to capacity and the excess will flow from the sprayhead, out of the funnel, and into the dispenser.  
4B. Models ST, STA:  
Connect the brewer to the power source, place the "ON/OFF" switch in the "ON" upper position, and  
momentarily press and release the start switch. Water will begin flowing into the tank. When water stops  
flowing into the tank, initiate a second and a third brew cycle. During the third brew cycle the tank will fill to  
its capacity and the excess will flow from the sprayhead, out of the funnel, and into the dispenser.  
4C. Models STF & STFA  
Brewers will fill automatically when lower ON/OFF switch is placed in the "ON" position and tank will fill to  
capacity.  
5. When the flow of water from the funnel stops, turn the thermostat knob to the “ON” position and wait  
approximately twenty minutes for the water in the tank to heat to the proper temperature. Some water will  
drip from the funnel during this time; this is due to expansion and should not occur thereafter.  
6. Empty the dispenser and initiate another brew cycle as directed:  
6A. Models S & SA:  
Pour one pitcher of tap water into the screened area on top of the brewer.  
6B. Models ST, STF, STA & STFA:  
Place the "ON/OFF" switch in the "ON" upper position, and momentarily press and release the start switch.  
7. Place the "ON/OFF" switch in the lower “OFF” position after water has stopped flowing from the funnel, and  
let the water in the tank reheat to the proper temperature.  
8. Empty the dispenser and proceed as directed:  
8A. Models S & SA:  
The brewer is now ready for use in accordance with the coffee brewing instructions on the next page.  
8B. Models ST, STF, STA & STFA:  
Place the "ON/OFF" switch in the "ON" upper position, and momentarily press and release the start switch.  
Check the water volume in the dispenser after water has stopped flowing from the funnel. It should be 64  
ounces.  
9. If not, disconnect the brewer from the power source. On early models remove the access panel. Adjust the  
timer asrequired (see service section). Replacethepanel, connectthebrewertothepowersource, andallow  
the water to reheat, start, and measure another brew cycle.  
10. Repeat step 9 until 64 oz water volume is achieved.  
11. The brewer is now ready for use in accordance with the coffee brewing instructions on the next page.  
29251 052500  
Page 5  
OPERATING CONTROLS  
Models S & SA:  
These models function without operating controls.  
Models ST, STF, STA & STFA:  
ON/OFF SWITCH  
Placing the "ON/OFF" switch in the "OFF" lower position stops brewing. 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. Placing the  
switch in the "ON" upper position supplies power to the brew station warmer and enables the brew circuit and on  
Models STF and STFA refills the tank.  
START SWITCH  
Momentarilypressingandreleasingtheswitchstartsabrewcyclewhenthe"ON/OFF"switchisinthe"ON"upper  
position.  
NOTE – The "ON/OFF" switch must be in the "ON" upper position to initiate and complete a brew cycle.  
COFFEE BREWING  
1. Insert a BUNN® filter into the funnel.  
2. Pour the fresh coffee into the filter and level the bed of grounds by gently shaking.  
3. Slide the funnel into the funnel rails.  
4. Place an empty dispenser beneath the funnel.  
5. Operate the brewer as directed:  
5A. Models S & SA:  
Pour one pitcher of tap water into the screened area on top of the brewer.  
5B. Models ST, STF, STA & STFA:  
Place the "ON/OFF" switch in the "ON" upper position. Momentarily press and release the start switch.  
6. When brewing is completed, simply discard the grounds and filter.  
CLEANING  
1. The use of a damp cloth rinsed in any mild, non-abrasive, liquid detergent is recommended for cleaning all  
surfaces on Bunn-O-Matic equipment.  
2. Check and clean the sprayhead. The sprayhead holes must always remain open.  
3. With the sprayhead removed, insert the deliming spring (provided) all the way into the sprayhead tube. When  
inserted properly, no more than two inches of spring should be visible. Saw back and forth five or six times.  
NOTE – In hard water areas, this may need to be done daily. It will help prevent liming problems in the brewer and  
takes less than a minute.  
29251 101598  
Page 6  
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, andrepairofelectricalequipmentshouldbeperformedonlybyqualifiedservicepersonnel.  
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.  
Theuseoftwowrenchesisrecommendedwheneverplumbingfittingsaretightenedorloosened. Thiswillhelp  
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  
1. No water  
REMEDY  
Brew cycle will not start (ST, STF,  
STA & STFA)  
Waterlinesandvalvestothebrewer  
must be open.  
2.Nopowerorincorrectvoltageto  
the brewer  
(A1) Check the terminal block for  
120 volts across the black and  
white terminals on two wire 120  
volt brewers.  
(A2) Check the terminal block for  
120 volts across the red and white  
terminals and the black and white  
terminal on three wire 120/240  
volt brewers.  
(A3) Check the terminal block for  
200 volts on Model STFB brewers  
or 240 volts on "A Series" brewers  
across the red and black termi-  
nals.  
(A4) Check the terminal block for  
100 volts on Model SDB brewers  
across the white and black termi-  
nals.  
(B)Checkcircuitbreakersorfuses.  
29251 101598  
Page 7  
TROUBLESHOOTING (cont.)  
PROBLEM  
PROBABLE CAUSE  
REMEDY  
Brew cycle will not start (cont.)  
(ST, STF, STA & STFA)  
3. ON/OFF switch  
Refer to Service - ON/OFF Switch  
for testing. See page 17  
4. Start switch  
5. Timer  
Refer to Service - Start Switch for  
testing procedures. See page 19  
RefertoService-Timerfortesting  
procedures. See page 22 or 24  
6. Solenoid valve  
Refer to Service - Solenoid Valve  
for testing procedures. See page  
18  
7. Strainer/flow control  
GPM)  
(.222  
(A) Direction of flow arrow must  
be pointing towards brewer.  
(B) Remove the strainer/flow con-  
trol and check for obstructions.  
Clear or replace.  
Water is not hot  
1. Limit thermostat  
Refer to Service - Limit Thermo-  
stat for testing procedures. See  
page 16  
CAUTION - Do not eliminate or  
bypass limit thermostat. Use only  
BOM replacement part #29329.  
1000.  
2. Control thermostat  
Refer to Service - Control Ther-  
mostatfortestingprocedures.See  
page 14  
3. Tank heater  
Refer to Service - Tank Heater for  
testing procedures. See page 20  
Inconsistent beverage level in dis-  
penser  
1. Strainer /flow control (.222  
GPM) (ST, STF, STA & STFA)  
(A) Direction of flow arrow must  
be pointing towards the brewer.  
(B) Remove the strainer/flow con-  
trol and check for obstruction.  
Clear or replace.  
2. Liquidlevelboardorlevelprobe  
Refer to Service - Liquid Level  
Board for testing procedures. See  
page 26  
29251 052500  
Page 8  
TROUBLESHOOTING (cont.)  
PROBLEM  
PROBABLE CAUSE  
REMEDY  
Inconsistentbeveragelevelindis-  
penser (cont.)  
3. Syphon system  
Thebrewermustbelevelorslightly  
lower in front to syphon properly.  
4. Lime build-up  
Inspect the tank assembly for ex-  
cessive lime deposits. Delime as  
required.  
CAUTION - Tank and tank compo-  
nents should be delimed regularly  
depending on local water condi-  
tions. Excessive mineral build-up  
onstainlesssteelsurfacescanini-  
tiate corrosive reactions resulting  
in serious leaks.  
5. Water pressure (ST, STF, STA  
& STFA)  
The water pressure to the brewer  
must be at least 20 psi (138 kPa).  
Consistently low beverage level in  
the dispenser (ST, STF, STA &  
STFA)  
1. Timer  
(A) Early models-Timer dial must  
indicate at least two minutes and  
fifteen seconds.  
(B) RefertoService-DigitalTimer  
for testing procedures. See page  
24  
2. Strainer/flow control (.222  
GPM)  
(A) Direction of flow arrow must  
be pointing towards brewer.  
(B) Remove the strainer/flow con-  
trol and check for obstructions.  
Clear or replace.  
Spitting or excessive steaming  
1. Lime build-up  
Inspect tank assembly for exces-  
sive lime deposits. Delime as re-  
quired.  
CAUTION - Tank and tank compo-  
nents should be delimed regularly  
depending on local water condi-  
tions. Excessive mineral build-up  
onstainlesssteelsurfacescanini-  
tiate corrosive reactions resulting  
in serious leaks.  
2. Control thermostat  
Refer to Service - Control Ther-  
mostatfortestingprocedures.See  
page 14  
29251 052500  
Page 9  
TROUBLESHOOTING (cont.)  
PROBLEM  
PROBABLE CAUSE  
REMEDY  
Dripping from sprayhead  
1. Syphon system  
Thebrewermustbelevelorslightly  
lower in front to syphon properly.  
2. Lime build-up  
Inspect the tank assembly for ex-  
cessive lime deposits. Delime as  
required.  
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.  
3. Solenoid valve (ST, STF, STA &  
STFA)  
Remove the solenoid valve and  
clear any obstructions. Rebuild or  
replace the valve if necessary.  
See page 18  
Waterflowsintotankcontinuously  
(ON/OFF Switch "ON")  
1. Timer (ST, STF, STA & STFA)  
2. Start switch  
RefertoService-Timerfortesting  
procedures. See page 22 or 24  
Refer to Service - Start Switch for  
testing procedures. See page 19  
3. Liquid level board  
Refer to Service - LiquidLevel  
Board for testing procedures. See  
page 26  
4. Relay  
Refer to Service - Relay for testing  
procedures. See page 28  
Waterflowsintotankcontinuously  
(ON/OFF Switch "OFF")  
1. Solenoid valve (ST, STF, STA &  
STFA)  
Remove the Solenoid Valve and  
clean any obstruction. Rebuild or  
replace the valve if necessary. See  
page 18  
Beverage overflows dispenser  
1. Dispenser  
Thedispensermustbecompletely  
emptybeforestartingabrewcycle.  
2. Timer (ST, STF, STA & STFA)  
RefertoService-Timerfortesting  
procedures. See page 22 or 24  
29251 052500  
Page 10  
TROUBLESHOOTING (cont.)  
PROBLEM  
PROBABLE CAUSE  
REMEDY  
3. Solenoid valve (ST, STF, STA &  
STFA)  
Beverage overflows dispenser  
(cont.)  
Remove the Solenoid Valve and  
clean any obstruction. Rebuild or  
replace the valve if necessary. See  
page 18  
1. Filter type  
2. Coffee grind  
3. Sprayhead  
Weak beverage  
The BUNN® paper filter must be  
used for proper extraction.  
A fine or drip grind must be used  
for proper extraction.  
A six-hole stainless steel spray-  
head must be used for proper  
extraction.  
4. Funnel loading  
The BUNN® paper filter must be  
centered in the funnel and the bed  
of ground leveled by gentle shak-  
ing.  
5. Water temperature  
Placeanemptyfunnelonanempty  
dispenser beneath the sprayhead.  
Initiate a brew cycle and check the  
water temperature immediately  
below the sprayhead with a ther-  
mometer. The reading should not  
be less than 195°F. Adjust the  
control thermostat to increase the  
watertemperature.Replaceifnec-  
essary.  
1. Funnel loading  
Dry coffee grounds remain in the  
funnel  
The BUNN® paper filter must be  
centered in the funnel and the bed  
ofgroundsleveledbygentlyshak-  
ing.  
1. Solenoid valve  
2. Plumbing lines  
Brewer is making unusal noises  
(ST, STF, STA & STFA)  
The nut on the solenoid must be  
tight or it will vibrate during op-  
eration.  
Plumbing lines should not resting  
on the counter top.  
29251 052500  
Page 11  
TROUBLESHOOTING (cont.)  
PROBLEM  
PROBABLE CAUSE  
REMEDY  
Brewer is making unusal noises  
(ST, STF, STA & STFA)(cont.)  
3. Water supply  
(A)Thebrewermustbeconnected  
to a cold water line.  
(B) Water pressure to the brewer  
mustnotexceed90psi(620kPa).  
Install a regulator if necessary to  
lower the working pressure to ap-  
proximately 50 psi (345 kPa).  
4. Tank heater  
Remove and clean lime off the  
tank heater. See page 20  
Automatic refill will not operate  
1. No water  
Check plumbing  
2. Strainer/flow control  
A. Direction of arrow must be  
pointing towards brewer.  
B. Remove the strainer/flow con-  
trol and check for obstructions.  
Clean or replace.  
3. Solenoid valve  
Refer to Service - Solenoid Valve  
for testing procedures. See page  
18  
4. Liquid level control board or  
level probe  
RefertoService-Liquidlevelcon-  
trol board or level probe for test-  
ing procedures. See page 26  
5. Relay  
Refer to Service - Relay for test-  
ing procedures. See page 28  
Beverage not staying hot in dis-  
penser  
1. ON/OFF switch  
Refer to Service - ON/OFF switch  
for testing procedures. See page  
17  
2. Warmer elements  
Refer to Service - Warmer ele-  
mentsfortestingprocedures. See  
page 29  
29251 052500  
Page 12  
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,andrepairofelectrical  
equipment should be performed only by qualified  
service personnel. The brewer should be unplugged  
when servicing, except when electrical tests are re-  
quired 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 replace-  
ment of any component.  
All components are accessible by the removal of  
thetopcoverortopwarmerhousingandfrontandrear  
inspection panels.  
The top cover for Models with no top warmer and  
the top warmer housing is attached with four #8-32  
screws. Unplug upper wiring harness and set housing  
aside.  
The front and rear inspection panels are attached  
with four #8-32 screws each.  
Contents  
Control Thermostat............................................. 14  
Limit Thermostat ................................................ 16  
ON/OFF Switch.................................................... 17  
Solenoid ............................................................. 18  
Start Switch (Brew) ............................................ 19  
Tank Heater ........................................................ 20  
Brew Timer (Early Models) ................................. 22  
Digital Timer (Late Models) ................................ 24  
Liquid Level Board ............................................. 26  
Relay.................................................................. 28  
Warmer Element ................................................ 29  
Thermal Cut-off ................................................. 30  
Wiring Diagrams.................................... 31 thru 43  
P1584  
FIG. 1 COMPONENT ACCESS  
29251 052500  
Page 13  
SERVICE (cont.)  
CONTROL THERMOSTAT  
Test Procedures:  
1. Disconnect the brewer from the power source.  
2. Locate the blue wire on the control thermostat.  
3. Check the voltage across the blue wire on the  
control thermostat and the white insert on two  
pole 100 or 120 volt terminal block or three pole  
120/240 volt terminal blocks and the red insert  
on two wire 200 volt or 240 volt terminal block  
with a voltmeter. Connect the brewer to the  
power source. The indication must be:  
O
F
F
I
H
a) 120 volts ac for two wire 120 volt models and  
three wire 120/240 volt models.  
b)200 to240voltsacfortwowire200or240volt  
models.  
c) 100 volts ac for two wire 100 volt models.  
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 the Wiring  
Diagrams and check the brewer wiring harness.  
5. Locate the black wire on the control thermostat.  
6. Gently remove the capillary bulb and grommet  
from the tank.  
7. Check the voltage across the black wire of the  
control thermostat and the white insert on the  
two pole 100 or 120 volt or three pole 120/240  
volt terminal block and the red insert on the two  
pole 200 volt or 240 volt terminal block with a  
voltmeter when the control thermostat is turned  
"ON" (Fully clockwise). Connect the brewer to the  
power source. The indication must be:  
a) 120 volts ac for two wire 120 volt models and  
three wire 120/240 volt models.  
b)200to240voltsacfortwowire200voltor240  
volt models.  
c) 100 volts ac for two wire 100 volt models.  
8. Disconnect the brewer from the power source.  
Ifvoltageispresentasdescribed,reinstallthecapillary  
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  
thermostat.  
P1585  
FIG. 2 CONTROL THERMOSTAT  
Location:  
ModelsS&SA:Thecontrolthermostatismounted  
on a bracket inside the rear inspection cover on  
the left side.  
Models ST, STA, STF & STFA: The control ther-  
mostat is located inside the front inspection  
cover on the component mounting bracket.  
29251 052500  
Page 14  
SERVICE (cont.)  
NOTE - The capillary tube must be clear of any electri-  
cal termination and not kinked.  
CONTROL THERMOSTAT (cont.)  
Removal and Replacement:  
7. Models S & SA: Using two #8-32 screws secure  
the control thermostat inside the rear inspection  
panel.  
Models ST, STA, STF & STFA: Using one #8-32  
screw secure the control thermostat to the com-  
ponent bracket inside the front inspection panel.  
8. Refer to FIG. 3 when reconnecting the wires.  
9. Adjust the control thermostat as required.  
1. Remove wires from control thermostat leads.  
2. Remove the thermostat capillary bulb by firmly  
pulling-uponthecapillaryatthetanklid. Thiswill  
disengage the grommet from the tank lid.  
3. Models S & SA: Remove the two #8-32 screws  
securing control thermostat bracket mounted  
inside the rear inspection panel.  
Models ST, STA, STF & STFA: Remove the one  
#8-32 screw securing the control thermostat to  
the component bracket in the front inspection  
panel.  
BLU to Limit Thermostat  
BLK to Tank Heater  
4. Slide the grommet to the line 4.5" above the bulb  
on the new capillary tube.  
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.  
6. Carefully bend the capillary tube so that the tube  
and bulb inside the tank are in the vertical posi-  
tion.  
O
F
F
H I  
P2182  
FIG. 3 CONTROL THERMOSTAT TERMINALS  
29251 052500  
Page 15  
SERVICE (cont.)  
LIMIT THERMOSTAT  
Removal and Replacement:  
1. Remove all wires from limit thermostat termi-  
nals.  
2. Carefully slide the limit thermostat out from  
undertheretainingclipandremovelimitthermo-  
stat.  
3. Carefully slide the new limit thermostat into the  
retaining clip.  
4. Refer to FIG. 5 when reconnecting the wires.  
BLK to Tank  
Heater Switch  
BLK to BLU Lead from  
Control Thermostat  
P1586  
FIG. 4 LIMIT THERMOSTAT  
Location:  
The limit thermostat is located on the rear of  
tank assembly.  
Test Procedures:  
1. Disconnect the brewer from the power source.  
2. Disconnect the blue and black wires from the  
limit thermostat.  
P1800  
3. Check for continuity across the limit thermostat  
terminals with a ohmmeter.  
FIG. 5 LIMIT THERMOSTAT TERMINALS  
If continuity is present as described, the limit thermo-  
stat is operating properly. If continuity is not present  
as described, replace the limit thermostat.  
29251 052500  
Page 16  
SERVICE (cont.)  
ON/OFF SWITCH (Models ST, STA, STF & STFA)  
5. With the black wire removed, remove from the  
lower terminal the white/red wire for the lower  
warmer switch, the brown/black wire for the top  
frontwarmerswitchortheblue/blackwireforthe  
top rear switch.  
6. Check for continuity across the center and lower  
terminal with the switch in the "ON" position.  
Continuity must not be present when the switch  
is in the "OFF" position.  
If continuity is present as described, reconnect the  
black wire to the center terminal and the white/red to  
the lower terminal.  
If continuity is not present as described, replace the  
switch.  
P1589  
Removal and Replacement:  
FIG. 6 ON/OFF SWITCH  
Location:  
The ON/OFF switch is located second from right  
on the switch panel.  
1. Remove the wires from the switch terminals.  
2. Compress the clips inside the switch panel and  
gently push the switch through the opening.  
3. Push the new switch into the opening and spread  
the clips to hold switch in the switch panel .  
4. Refer to FIG. 7 when reconnecting the wires.  
Test Procedure:  
1. Disconnect the brewer from the power source.  
2. Viewing the switch from the back remove the  
white or red wire from the upper terminal and the  
black wire from the center terminal.  
3. Check the voltage across the white or red wire  
and the black wire with a voltmeter. Connect the  
brewer to the power source. The indication must  
be:  
BLK to Terminal  
Block (Black  
WHI to Terminal Block  
Insert)  
(White Insert on 120/  
208V or 120/240V  
Models)  
WHI/VIO to  
Lower Warmer  
BRN/BLK to Top  
Front Warmer  
BLU/BLK to Top  
Rear Warmer  
RED to Terminal Blck  
(Red Insert on 200V  
or 240V Models)  
a) 120 volts ac for two wire 120 volt models and  
three wire 120/240 volt models.  
b)200to240voltsacfortwowire200or240volt  
models.  
P1590  
c) 100 volts ac for two wire 100 volt models.  
4. Disconnect the brewer from the power source.  
FIG. 7 ON/OFF SWITCH TERMINALS  
If voltage is present as described, reconnect the white  
or red wire and proceed to #5.  
If voltage is not present as described, refer to the  
Wiring Diagrams and check the brewer wiring har-  
ness.  
29251 052500  
Page 17  
SERVICE (cont.)  
6. Check the solenoid valve for coil action. Connect  
the brewer to the power source. With "ON/OFF"  
switch in the "ON" upper position press start  
switch and listen carefully in the vicinity of the  
solenoid valve for a" clicking" sound as the coil  
magnet attracts.  
SOLENOID VALVE (Models ST, STA, STF & STFA)  
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  
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.  
P1587  
FIG. 8 SOLENOID  
Location:  
Removal and Replacement:  
1. Remove the wires from the solenoid valve.  
2. Turn-off the water supply to the brewer.  
3. Disconnect the water lines to and from the sole-  
noid valve.  
The solenoid valve is located inside the front  
inspection panel on the center lower part of the com-  
ponent mounting bracket.  
4. Remove the two #8-32 screws securing the so-  
lenoid mounting bracket to the component  
bracket. Remove solenoid bracket and solenoid  
valve as an assembly.  
5. Removethetwo#10-32screwsandlockwashers  
securing the solenoid valve to the solenoid  
bracket.  
6. Using two #10-32 screws and lockwashers in-  
stall new solenoid valve on solenoid mounting  
bracket.  
7. Using two #8-32 screws install solenoid valve  
and bracket to the component bracket.  
8. Securely fasten the water lines to and from the  
solenoid valve.  
Test Procedures:  
1. Disconnect the brewer from the power source.  
2. Disconnect the wires (FIG. 9) from the solenoid  
valve. With the "ON/OFF" switch in the "ON" upper  
position press the start switch.  
3. Check the voltage across the two wires with a  
voltmeter. Connect the brewer to the power  
source. The indication must be:  
a) 120 volts ac for two wire 120 volt models and  
three wire 120/240 volt models.  
b)200to240voltsacfortwowire200or240volt  
models.  
c) 100 volts ac for two wire 100 volt models.  
4. Disconnect the brewer from the power source.  
9. Refer to FIG. 9 when reconnecting the wires.  
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.  
5. Check for continuity across the solenoid valve  
coil terminals.  
If continuity is present as described, reconnect the  
wires (FIG. 9) to the solenoid.  
If continuity is not present as described, replace the  
solenoid valve.  
P1588  
FIG. 9 SOLENOID TERMINALS  
29251 052500  
Page 18  
SERVICE (cont.)  
START SWITCH (Models ST, STA, STF & STFA)  
Removal and Replacement:  
1. Remove the WHI/YEL and WHI/ORA wires from  
the start switch.  
2. Compress the clips inside the hood and gently  
push the switch through the opening.  
3. Push new switch into the opening and spread the  
clips to hold the start switch in the hood.  
4. Refer to FIG. 11 when reconnecting the wires.  
WHI/YEL to Brew Timer TL3  
WHI/ORAto Brew Timer TL5  
P1589  
FIG. 10 START SWITCH  
Location:  
TheSTARTswitchislocatedfarrightontheswitch  
panel.  
P1591  
FIG. 11 START SWITCH TERMINALS  
Test Procedures:  
1. Disconnect the brewer from the power supply.  
2. DisconnecttheWHI/YELwirefromthetopswitch  
terminal and the WHI/ORA wire from the bottom  
switch terminal.  
3. Check for continuity across the two terminals on  
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  
WHI/YEL wire to the top terminal and the WHI/ORA  
wire to the bottom terminal.  
If continuity is not present as described, replace the  
switch.  
29251 052500  
Page 19  
SERVICE (cont.)  
TANK HEATER  
c)200to240voltsacfortwo wire200or 240volt  
models.  
d) 100 volts ac for two wire 100 volt 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  
Wiring Diagrams and check wiring harness.  
4. Disconnect the black wire and the white wire or  
red wire from the tank heater terminals.  
5. Checkforcontinuityacrossthetankheatertermi-  
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.  
P1592  
NOTE- If the tank heater remains unable to heat,  
remove and inspect heater for cracks in the sheath.  
FIG. 12 TANK HEATER  
Location:  
Removal and Replacement:  
1. Remove top cover or top warmer housing as  
prevoiusly described.  
The tank heater is located inside the tank and  
secured to the tank bottom.  
2. Disconnect the water supply tube from the sole-  
noid.  
3. On brewers with faucet, disconnect the faucet.  
4. Remove sprayhead and the hex nut securing the  
sprayhead tube to the hood. Set aside for reas-  
sembly.  
5. Disconnect the wire from the tank level probe.  
6. Remove the thermostat capillary bulb as de-  
scribed in section for control thermostat.  
7. Disconnect the wires from the limit thermostat.  
Test Procedures:  
1. Disconnect the brewer from the power supply.  
2. Check the voltage across the black and white  
wires on 100 or 120 volt models or the black and  
red wires for 120/240 volt models, 200 volt  
models and 240 volt models with a voltmeter.  
Connect the brew to the power source. The  
indication must be:  
a) 120 volts ac for two wire 120 volt 15 and 20  
amp models .  
b) 240 volts ac for three wire 120/240 volt  
models.  
29251 052500  
Page 20  
SERVICE (cont.)  
TANK HEATER (Cont.)  
8. Disconnect the black wire and the white or red  
wire from the tank heater terminals.  
21. Reconnect the wires to the limit thermostat and  
control thermostat. See limit thermostat and  
control thermostat sections in this manual when  
reconnecting wires.  
22. Installtanklidwithholddownbracketsand#8-32  
nuts  
23. Install the thermostat capillary bulb as described  
in section for control thermostat.  
24. Reconnect the wire to the liquid level probe.  
25. Refer to FIG. 13 when reconnecting the tank  
heater wires.  
9. Remove the three #8-32 nuts and holddown  
brackets securing the tank lid to the tank.  
10. Remove the tank lid with level probe.  
11. Remove the switch panel and disconnect the  
leads to the tank "Keep Warm" heater.  
12. On 100 volt models equipped with rear drain,  
open the shut-off valve and drain water from the  
tank. Disconnect drain tube and fittings from  
tank.  
13. Direct the pink probe wire, capillary tube and top  
warmer wiring harness through the nylon bush-  
ing located on the rear of the basin flange.  
14. Lift tank and fill basin assembly from housing  
and drain water from tank.  
15. Remove the two hex nuts securing the tank  
heater to the bottom of tank. Remove tank heater  
with gaskets and discard.  
16. Install new tank heater with gaskets to the tank  
and secure with two hex nuts.  
17. Installtankwithlimitthermostat, sprayheadtube  
and tank heater.  
WHI or RED Wire  
From Tank Heater  
BLK Wire to Limit  
Thermostat  
P1593  
18. Reconnect the inlet and outlet water lines to the  
solenoid and faucet.  
19. Secure spayhead tube to hood using a hex nut.  
20. Install sprayhead.  
FIG. 13 TANK HEATER TERMINALS  
29251 052500  
Page 21  
SERVICE (cont.)  
BREW TIMER (Early Models ST, STA, STF & STFA)  
If voltage is present as described, proceed to #5.  
If voltage is not present as described, refer to the  
Wiring Diagrams and check the brewer wiring har-  
ness.  
5. Disconnect the white/orange wire from terminal  
TL3 and the white/yellow wire from terminal TL5.  
Checkforcontinuityacrossthetwowireswhenthe  
start switch is pressed to the "START" position.  
If continuity is present as described, reconnect the  
wires and proceed to #6.  
If continuity is not present as described, refer to the  
Wiring Diagrams and check the brewer wiring har-  
ness.  
6. With a voltmeter, check the voltage across termi-  
nals TL1 and TL4 when the "ON/OFF" switch is in  
the"ON"position. Connectthebrewertothepower  
source. The indication must be zero.  
OLD STYLE  
P1594  
Ifvoltageindicationsareotherthandescribed,discon-  
nectthebrewerfromthepowersourceandreplacethe  
timer.  
FIG. 14 BREW TIMER  
Location:  
The timer dial is located inside the front inspection  
panel on the top of component mounting bracket. The  
timer board is located inside the rear inspection panel  
on the component mounting bracket.  
If voltage is correct, proceed to #7.  
7. With a voltmeter, check the voltage across termi-  
nals TL1 and TL4 when the "ON/OFF" switch is in  
the"ON"position. Connectthebrewertothepower  
source and press the start switch. The indication  
must be:  
Test Procedures:  
1. Disconnect the brewer from the power source.  
2. Rotate the dial fully counterclockwise.  
3. With a voltmeter, check the voltage across termi-  
nals TL1 and TL2 when the "ON/OFF" switch is in  
the"ON"position. Connectthebrewertothepower  
source. The indication must be:  
a.) 120 volts ac for two wire 120 volt models,  
three wire 120/208 volt models and three wire  
120/240 volt models.  
b.) 200to240voltsacfortwowire200or240volt  
models.  
a.) 120 volts ac for two wire 120 volt models,  
three wire 120/208 volt models and three wire  
120/240 volt models.  
b.) 200to240voltsacfortwowire200or240volt  
models.  
Ifvoltageindicationsareotherthandescribed,discon-  
nectthebrewerfromthepowersourceandreplacethe  
timer.  
If voltage is correct, readjust the timer as required.  
4. Disconnect the brewer from the power source.  
29251 082100  
Page 22  
SERVICE (cont.)  
BREW TIMER (Early Models)(cont.)  
S
E
.
T
IC  
T
V
U
A
-M  
C
IN  
A
M
0
-O  
-
2
N
N
1
Removal and Replacement:  
U
2
0
B
2
6
/N  
P
1. Remove all wires from the timer.  
2. Remove the circuit board and dial plate from the  
brackets.  
WHI/RED TL1 to ON/OFF Switch  
WHI TL2 to Terminal Block and Warmer  
Element (120V Two Pole, 120/208V or  
120/240V Three Pole Terminal Block)  
RED TL2 to Terminal Block and Warmer  
Element(200Vor240VTwoPoleTermi-  
nal Block)  
3
Install new timer circuit board as described in  
LateModelTimersectiononthefollowingpages.  
4. Refer to Fig. 17 when reconnecting the wires.  
5. Install the Timer Setting decal provided with the  
replacement timer kit, on the back side of the  
front access panel.  
6. Adjust the timer as required. Refer to Late Model  
Timer section on the following pages.  
WHI/ORA TL3 to Start Switch (top)  
WHI/GRN TL4 to Solenoid Valve  
or Relay Terminal B  
WHI/YEL TL5 to Start Switch (bottom)  
OLD STYLE  
P1595  
FIG. 15 BREW TIMER TERMINALS  
29251 082100  
Page 23  
SERVICE (cont.)  
DIGITAL BREW TIMER (Late Models)  
4. With a voltmeter, check the voltage across termi-  
nals TL1 and TL4 when the "ON/OFF" switch is in  
the"ON"position. Connectthebrewertothepower  
source. The indication must be zero volts.  
If voltage is as described, proceed to #5.  
If voltage is not as described, disconnect the brewer  
from the power source and replace the timer.  
5. With a voltmeter, check the voltage across termi-  
nals TL1 and TL4 when the "ON/OFF" switch is in  
the"ON"position. Connectthebrewertothepower  
source and press the start switch. The indication  
must be:  
K
C
K
LO  
C
T
O
L
E
S
T
E
S
J
1  
T
1
T
2
T
3
T
T
a.) 120 volts ac for two wire 120 volt models,  
three wire 120/208 volt models and three wire  
120/240 volt models.  
b.) 200to240voltsacfortwowire200or240volt  
models.  
If voltage is as described, the brew timer is operating  
properly. Reset the timer as required, to obtain the  
desired brew volume.  
Ifvoltageisnotasdescribed,testtheSTARTswitchfor  
operation before replacing the timer (see page 19).  
TestON/OFFSwitchifSTARTSwitchisfunctional(see  
page 17). If voltage is as described for both switches,  
disconnect the brewer from the power source and  
replace the timer.  
P2181  
FIG. 16 DIGITAL BREW TIMER  
Location:  
The timer is located inside the front inspection  
panel. Some earlier models, with the new timer will  
have them located inside the rear panel.  
Test Procedures:  
NOTE:Donotremoveorinstallwireswhiletimerboard  
is installed. Pressure applied to one side may cause  
damage to the board.  
1. Disconnectthebrewerfromthepowersource and  
remove the front panel.  
2. With a voltmeter, check the voltage across termi-  
nals TL1 and TL2 when the "ON/OFF" switch is in  
the"ON"position. Connectthebrewertothepower  
source. The indication must be:  
Removal and Replacement:  
NOTE:Donotremoveorinstallwireswhiletimerboard  
is installed. Pressure applied to one side may cause  
damage to the board.  
1. Remove the two #6-32 screws securing circuit  
board to component mounting bracket.  
2. Remove circuit board and nylon spacers.  
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. 17 when reconnecting the  
wires.  
5. Install new circuit board with nylon spacers to  
component mounting bracket.  
a.) 120 volts ac for two wire 120 volt models,  
three wire 120/208 volt models and three wire  
120/240 volt models.  
b.) 200to240voltsacfortwowire200or240volt  
models.  
3. Disconnect the brewer from the power source.  
6. Adjust the timer as described below.  
If voltage is present as described, proceed to #4.  
If voltage is not present as described, refer to the  
Wiring Diagrams and check the brewer wiring har-  
ness.  
29251 011501  
Page 24  
SERVICE (cont.)  
NOTE:Severalouncesofwaterwillcontinuetosyphon  
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, volumes 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 prevent  
any further programming.  
DIGITAL BREW TIMER (Late Models)(cont.)  
Timer Setting:  
NOTE: Check that the brewer is connected to water  
supply, the tank is properly filled, and a funnel and  
server are in place, prior to setting or modifying  
volumes.  
NOTE: All volume settings must be done with the  
sprayhead installed.  
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 ON/OFF  
switch in the "ON" position, press and hold the START  
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 brew volume, place the ON/OFF  
switch in the "ON" position, press and release the  
STARTswitchonceforeverytwo-secondintervaltobe  
removed from the total brew time period; then imme-  
diately press and hold down the START 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  
previousvolumesettingwillremaininmemory).Allow  
the brew cycle to finish in order to verify that the  
desired volume has been achieved.  
NOTE:Torelocatearear-mounteddigitalbrewtimerto  
the front of the brewer, order kit number 32005.0000  
for 120/240V 3-wire models. Order 32005.0001 for  
200V-240V 2-wire models. These kits have the parts  
necessary to relocate the timer.  
2. Setting brew volumes. To set a brew volume, first  
checkthattheSET/LOCKswitchisinthe"SET"position  
on the circuit board. Place the ON/OFF switch in the  
"ON" 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 sec-  
onds after the third click causes the volume setting to  
be aborted and previous volume setting will remain in  
memory).  
TL1 - WHI/RED to ON/OFF Switch  
TL2 - WHI to Terminal Block and Warmer  
element (120V two-pole, 120/208V  
or120/240Vthreepoleterminalblock)  
or  
RED to Terminal Block and Warmer  
element (200V or 240V two pole ter-  
minal block)  
TL3 - WHI/ORN to Start Switch (Top)  
TL4 - WHI/GRN to Solenoid Valve or Relay  
Terminal B  
View the level of the liquid being dispensed. When the  
desired level is reached, turn the ON/OFF switch to  
"OFF".  
TL5 - WHI/YEL to Start Switch (Bottom)  
P2037  
FIG. 17 DIGITAL TIMER WIRING  
29251 011501  
Page 25  
SERVICE (cont.)  
LIQUID LEVEL CONTROL BOARD (Models STF &  
STFA)  
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 the  
wiring diagrams and check the brewer wiring harness.  
5. Reconnect the blue wire to terminal 1.  
6. Carefully connect a piece of insulated jumper  
wire to terminal 4. Keep the other end of this wire  
away from any metal surface of the brewer.  
7. Check the voltage across terminals 1 & 3 with a  
voltmeter. Connect the brewer to the power  
source.Turn the "ON/OFF" switch to the "ON"  
position The indication must be:  
a.) 120 volts ac for three wire 120/208 volt  
models and three wire 120/240 volt models after  
a delay of approximately 5 seconds.  
b.) 200 to 240 volts ac for two wire 200 or 240  
volt models after a delay of approximately 5  
seconds.  
8. Touch the free end of jumper wire to the brewer  
housing. The indication must be 0.  
9. Move the jumper wire away from the brewer  
housing. The indication must again be:  
a.) 120 volts ac for three wire 120/208 volt  
models and three wire 120/240 volt models after  
a delay of approximately 5 seconds.  
P1598  
FIG. 18 LIQUID LEVEL PROBE  
& CONTROL BOARD  
Location:  
b.) 200 to 240 volts ac for two wire 200 or  
240volt models after a delay of approximately 5  
seonds.  
The liquid level probe is located within the tank lid  
inside the fill basin. The liquid level board is located  
inside the rear inspection panel on the top left of  
component mounting bracket.  
10. Disconnect the brewer from the power source  
and remove the jumper wire from terminal 4.  
Test Procedure.  
1. Disconnect the brewer from the power source.  
2. Remove the blue wire from terminal 1 and the  
pink wire from terminal 4 of the circuit board.  
3. Check the voltage across terminals 2 and 3 with  
a voltmeter. Connect the brewer to the power  
source. Turn the "ON/OFF" switch to the "ON"  
position.The indication must be:  
a) 120 volts ac for two wire 120 volt models and  
three wire 120/240 volt models.  
b)200to240voltsacfortwowire200voltor240  
volt models.  
c) 100 volts ac for two wire 100 volt models.  
29251 052500  
Page 26  
SERVICE (cont.)  
LIQUID LEVEL CONTROL BOARD (Models STF &  
STFA)(Cont,)  
If voltage is present as described, reinstall the probe,  
the level control board and level probe are operating  
properly.  
If voltage is present as described, the level control  
board is operating properly, proceed to #11.  
If voltage is not present as described, replace the level  
control board.  
If voltage is not present as described, check the pink  
probe wire.  
Removal and Replacement:  
1. Remove all wires from the level control board.  
2. Remove two #8-32 screws and lockwashers  
holdinglevelcontrolboardtocomponentbracket.  
3. Install the new level control board to the  
component bracket. Make certain that the  
lockwashers are between the level control board  
and the component bracket.  
11. Reconnect the pink wire to terminal 4.  
12. Gently pull the probe out of the tank lid and  
inspect for corrosion. Replace it if necessary.  
13. Place the probe so that neither end is in contact  
with any metal surface of the brewer.  
14. Check the voltage across terminals 1 & 3 with a  
voltmeter. Connect the brewer to the power  
source. Turn the "ON/OFF" switch to the "ON"  
position. The indication must be:  
4. Refer to FIG. 19 when reconnecting the wires.  
a.) 120 volts ac for three wire 120/208 volt mod-  
els and three wire 120/240 volt models after a  
delay of approximately 5 seconds.  
b.) 200 to 240 volts ac for two wire 200 or 240  
volt models after a delay of approximately 5  
seconds.  
15. Move the probe's flat end to the brewer housing.  
The indication must be 0.  
16. Move the probe's flat end away from the brewer  
housing. The indication should again be:  
a.) 120 volts ac for three wire 120/208 volt  
models and three wire 120/240 volt models.  
b.) 200 to 240 volts ac for two wire 200 or 240  
volt models.  
BLU to Relay 2  
WHI/RED to Relay 5 and Timer TL1  
WHI to Timer TL2  
PNK to Probe  
17. Disconnect the brewer from the power source.  
P1599  
FIG. 19 LIQUID LEVEL CONTROL  
BOARD TERMINALS  
29251 052500  
Page 27  
SERVICE (cont.)  
TIMER RELAY (Models STF & STFA)  
If continuity is present as described, reconnect the  
WHI/RED and WHI/BLU wires to the relay, relay is  
operating properly.  
Location:  
If continuity is not present as described, replace the  
relay.  
The relay is located inside the front inspection  
panel on the bottom of component mounting bracket.  
6. Remove the BLU wire from terminal 2 and the  
WHI/BLU wire from terminal 7 on the relay.  
7. Check for continuity across terminals 2 and 7 by  
manually closing the relay contact. Continuity  
must be present when contact is released.  
If continuity is present as described, reconnect the  
BLUandWHI/BLUwirestotherelay,relayisoperating  
properly.  
If continuity is not present as described, replace the  
relay.  
Removal and Replacement:  
1. Remove all wires from the relay terminals.  
2. Removethetwo#6-32screwssecuringtherelay  
and shield to the mounting bracket.  
3. With the two #6-32 screws, secure the new relay  
and shield to the mounting bracket.  
4. Refer to FIG.21 when reconnecting the relay  
wires.  
5. Fold the flap of the protective shield over the  
relay and tuck the edge inside the housing.  
P1596  
FIG. 20 TIMER RELAY  
Test Procedure.  
2- BLU to L1 Liquid  
Level board  
1. Disconnect the brewer from the power source.  
2. Remove the WHI/RED wire from the "A" terminal  
andtheWHI/GRNwirefromthe"B"terminalonthe  
relay.  
5- WHI/RED to L2 on  
Liquid Level Board  
3. Check for continuity across the "A" and "B" termi  
nals.  
B-WHI/GRN toTL4  
on Brew Timer  
If continuity is present as described, reconnect the  
WHI/RED and WHI/GRN wires to the relay and pro-  
ceed to #4.  
If continuity is not present as described, replace the  
relay.  
7- WHI/BLU to  
Solenoid Valve  
A-WHI/RED to TL1  
on Brew Timer  
P1597  
FIG. 21 TIMER RELAY TERMINALS  
4. Remove the WHI/RED wire from terminal 5 and  
the WHI/BLU wire from terminal 7 on the relay.  
5. Check for continuity across terminals 5 and 7 by  
manually closing the relay contact. Continuity  
must be present until contact is released.  
29251 052500  
Page 28  
SERVICE (cont.)  
WARMER ELEMENTS  
Location:  
3. Check voltage across the WHI wire from the  
terminal block and the wire from the "ON/OFF"  
switch to the warmer element with a voltmeter  
with the "ON/OFF" switch in the "ON" position.  
The indication must be:  
The warmer elements are located under the  
warmer plates.  
a) 120 volts ac for two wire 120 volt versions.  
b) 120 volts ac for three wire 120/208 volt  
versions or 120/240 volt versions.  
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.  
5. Checkthecontinuityacrossthetwoterminalson  
the warmer element.  
If continuity is present as described, reconnect the  
wires on the warmer element.  
If continuity is not present as described, replace the  
warmer element.  
Removal and Replacement:  
1. Remove the three #4-40 screws securing the  
warmer assembly to the brewer.  
2. Lift the warmer assembly from the brewer.  
3. Disconnect the two wires from the warmer ele-  
ment terminals.  
4. Removethetwo#8-32nutssecuringthewarmer  
element to the warmer plate.  
5. Securely install new warmer element.  
6. Reconnect the two wires to warmer element  
terminals.  
7. Securelyinstallwarmerassemblyonthebrewer.  
8. Refer to FIG. 23 when reconnecting the wires.  
P1601  
FIG. 22 WARMER ELEMENTS  
Test Procedures:  
1. Disconnect the brewer from the power source.  
2. Use the WHI wire to the terminal block and the  
wire from the warmer element to the "ON/OFF"  
switch.  
BRN/BLK Wire to Top Front Warmer Switch  
BLU/BLK Wire to Top Rear Warmer Switch  
WHI Wire to Terminal Block (White Insert on 120/208V or  
120/240V Models) or  
RED Wire to Terminal Block (Red Insert on 200V or 240V  
Models)  
WHI/VIO Wire to Lower Warmer/ON Switch  
WHI Wire to Terminal Block (White Insert on 120/208V or  
120/240V Models) or  
RED Wire to Terminal Block (Red Insert on 200V or 240V  
Models)  
P1602  
FIG. 23 WARMER ELEMENT TERMINALS  
Page 29  
29251 052500  
SERVICE (cont.)  
THERMAL CUT-OFF (Models SA, STA & STFA)  
Location:  
The thermal cutoffs are located on both tank  
heater terminals.  
Test Procedures:  
1. Disconnect the brewer from the power source.  
2. Disconnect the thermal cutoff from the tank  
heater terminal and the limit thermostat or wir-  
ing harness.  
3. Check for continuity across the thermal cutoff  
terminals using an ohmmeter.  
Thermal cutoff to BLK Lead  
If continuity is present, the thermal cutoff is operating  
properly. If continuity is not present as described,  
replace the thermal fuse.  
Thermal cutoff to WHI or RED Lead  
P1593  
FIG. 24 THERMAL CUT-OFF  
Removal and Replacement:  
1. Disconnect the thermal cutoff from the tank  
heater terminal and the limit thermostat or wir-  
ing harness.  
2. Remove thermal cutoff and discard.  
3. Connect new thermal cutoff to the tank heater  
terminal and the limit thermostat or wiring har-  
ness.  
4. Refer to FIG. 24 when reconnecting wires.  
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