Bunn ITCB Single Series Installation guide

BUNN®TECHNICAL TRAINING
ITCB

Index
Unit 1: Installation
Site Requirements .............................................................................................................. 4
Location of the Serial Number .......................................................................................... 4
Water Supply Install ...........................................................................................................4
Electrical Install ..................................................................................................................5
Initial Start-Up ..................................................................................................................... 5
Unit 2: Setup
Setup and Programming.................................................................................................... 7
Programming Lockout................................................................................................. 7
Level 1 Programming ......................................................................................................... 7
Level 2 Programming ......................................................................................................... 8
Uploading a Recipe Using a Recipe Card ........................................................................ 10
Calibrating the Sprayhead Flow Rate ............................................................................... 10
Calibrating the Dilution Flow Rate .................................................................................... 11
Default Values ..................................................................................................................... 11
Unit 3: Machine Composition
Exterior Overview ............................................................................................................... 13
Product Outlets and Removable Parts ......................................................................13
User Interface ...............................................................................................................13
Accessing the Inside of the Brewer.................................................................................. 13
Machine Function and Operations.................................................................................... 13
Main Control Board......................................................................................................13
Filling System...............................................................................................................14
Heating System ............................................................................................................14
Dispensing System...................................................................................................... 14
Dilution System ............................................................................................................ 15
Unit 4: Preventive Maintenance
Preventive Maintenance..................................................................................................... 17
Draining the Tank ...............................................................................................................17
PM Steps .............................................................................................................................17
Unit 5: Troubleshooting
Service Tools ...................................................................................................................... 20
Test Outputs .................................................................................................................20
Test Switches ............................................................................................................... 21
Test Frequency............................................................................................................. 21
Service Fault Messages ..................................................................................................... 21
Triac Map ............................................................................................................................. 22
© 2009 Bunn-O-Matic Corporation. All Rights Reserved
Rev. A

Unit Objectives
Un i t 1 in s t a l l a t i o n
Given a realistic scenario depicting a new site install, the learner will be able to install and setup the brewer
for retail turnover without error.
Given a new machine, all the necessary tools and safety equipment, the learner will be able to install
the brewer without error.
The learner will be able to verify that the site requirements have been met.
The learner will be able to locate and document the serial number.
The learner will be able to hook up the water supply.
The learner will be able to hook up the electrical supply.

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Installation
Site Requirements
Space
Height clearance for either 30.87” or 34.04” depending on model•
Footprint able to accommodate 11W x 24D•
Counter able to support 100lbs. (operating weight of the brewer with a full 5 gallon tea server)•
Level installation surface, brewer level on the surface•
Water Treatment
Sedimentltrationtoreducelargeparticles•
Tasteandodorltertoremovechlorine•
Scaleltrationasneeded•
For best results a Bunn Easy Clear• ®ltrationsystemshouldbeused
Plumbing
.75-11.5NH(hosethread)tting(¼”areadapterincluded)•
Dedicated water supply with shut-off•
Connected to the cold water supply•
Water pressure 20-90psi•
Minimumwaterowof1.25GPM•
Electrical (120VAC)
120VAC•
2-wire plus ground (L1, neutral, ground)•
15 amp dedicated circuit (breaker, plug, and receptacle)•
Receptacle within 5 feet of the machine•
Electrical (208VAC or 240VAC)
120/208VAC or 120/240VAC•
3-wire plus ground (L1, L2, neutral, ground)•
20 amp dedicated circuit (breaker, plug, and receptacle)•
Receptacle within 5 feet of the machine•
Location of the Serial Number
The machine’s serial number is located on the data plate which is adhered to the front panel below
the dilution nozzle. The complete serial number will need to be documented on all work orders and
warranty tags. The serial number is also stored in memory on the control board.
Water Supply Install
Step 1:Removetheshippingcapfromthettingontherearofthebrewer.
Step 2:Installthe.75-11.5NHto¼”areadapterontherearofthebrewer;besuretousetheincludedrubber
washer.
Step 3: Flush the water line.
Step 4:Attachthewaterlinetothe¼”arettingonthebackofthemachine.
Step 5: Turn on the water supply.

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Electrical Install
Anelectricianmustprovideelectricalserviceasspeciedinconformancewithalllocal,state,and
federal electrical codes.
The ITCB is a dual voltage unit. There is a voltage switch located on the back of the brewer. The
brewer is wired from the factory with a 2-wire+ground power cord and plug rated for 120VAC at
15amps.For208VACor240VACcongurations,the3-wire+groundpowercordmustbeordered
fromBUNN:P/N:01699.0000.Thetechnicianmustsupplya20amprated,4-wireplug.
For 120V brewers:
Step 1: Plugbrewerintothepowersource.
For 120/208VAC or 120/240VAC brewers:
Step 1: Remove the rear panel.
Step 2: Disconnect the 2-wire+ground cord from the terminal block.
Step 3: Feed the 3-wire+ground power cord through the strain relief.
Step 4: Attach the wire ends to the terminal block.
Step 5: Attach the ground wire to connector below the terminal block.
Step 6: Check that all connections are tight.
Step 7:Placethedualvoltagetoggleswitchinthecorrectposition.
Step 8: Tighten the strain relief and replace the rear panel.
Step 9:Plugtheunitintothepowersource.
Initial Start-Up
Step1:PlacethemainpowerswitchintotheOnposition.
WhenthemachineisturnedonandtheEnableBrewOn/Offswitchispressed,itwillbegintollthetank.
Afterthetankllsthemachinewillautomaticallybegintheheatingcycle.Thiswilltakeapproximately20minutes.
Once the water temperature has reached the programmed Brew Lockout temperature it will display the ready screen.
The machine will continue to heat until it reaches its programmed shut-off temperature.
PLEASE WAIT
TANK FILLING
HEATING
WATER TEMP XXXXº
READY TO BREW
WATER TEMP: 205º

Unit Objectives
Un i t 2 se t u p
Given a realistic scenario depicting a new site install, the learner will be able to install and setup the brewer
for retail turnover without error.
Given an installed machine, all the necessary tools and safety equipment, the learner will be able to
set the machine up for initial operation.
The learner will be able to power on the machine.
The learner will be able to access and scroll through the programming options.
The learner will be able to perform the calibrations.

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SetupandProgramming
Accessing and using the brewer’s programming features is done from the front panel and requires no special tools.
The programming menu is accessed through a hidden switch located on the right side of the display. The hidden
switch on the left side will allow you to scroll backwards.
A. Right Hidden Switch:This is used to access the programming mode and is also used to scroll forward through the
function list.
B. Left Hidden Switch: This is used to scroll backwards through the function list.
C. Brew A: This is used to select options that appear on the display during programming.
D. Brew B: This is used to select options that appear on the display during programming.
E. Brew C: This is used to select options that appear on the display during programming.
To exit the programming mode at any time, press and release the ON/OFF button located on the user interface. The
display will return to the main screen.
Programming Lockout
If the programming cannot be access then the programming lockout switch is in the Lock position. The switch is
located on the control board. Remove the top panel, locate the switch and place it into the Unlock position.
Note:PriortoserialnumberICB00007479,thelockoutswitchwillbelocatedonthememorymoduleboard.
Level 1 Programming
Pressthehiddenswitchforonesecondtoaccess.
This function allows the operator to prevent or allow brewing if the water temperature is
less than the Set Ready temperature.
BREW LOCKOUT ?
ON OFFDONE
HALF
FULL
BREW
A
BREW
B
BREW
C
®
ENABLE
ON / OFF
BREW
A
B
C D E
READY TO BREW
WATER TEMP: 200°
MEMORY
LOCK UNLOCK
PROGRAMMING
LOCKOUT SWITCH
P3048

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Level 2 Programming
Pressandholdthehiddenswitchfor5seconds
This function allows the operator to select the language used for the display.
This function allows the operator to select if numeric settings are displayed in English or
Metric units.
This function allows the operator to view the brew settings for the carious coffee recipes
stored into the brewer. It also allows the operator to modify any of the brew settings for a
particular recipe stored in the brewer.
This function allows the operator to assign a recipe to (or disable) each of the 3 brew
switches (A, B, C). Any saved recipes listed under “Review Recipes” can be assigned to
a brew switch. Only one recipe per brew switch is allowed.
ThisfunctionallowstheoperatortosetBrewVolumes,Bypass%,PulseBrew/Preinfu-
sion Times and Drip Out Times for each coffee name stored in the grinder’s memory.
This function allows the operator to adjust the brew water temperature in the tank. This
also sets the hot water faucet dispense temperature.
This function allows the operator to set the minimum temperature allowable to start a
brew cycle. The range can be from 2° to 20° F below the set temperature. The water
must be at the Ready temperature or higher for the display to indicate Ready To Brew. If
brew lockout is enabled, the brewing process won’t start below this Ready temperature.
This function allows the operator to choose whether or not to display an advertising mes-
sage. An ad can be saved to the brewer by either writing the ad using the programming
commands, or by entering the ad into the brewer using an Ad Card. This message will
be displayed when the brewer is not in use.
This function allows the operator to enable the sanitation function and set the time be-
fore a cleaning alert will be displayed.
This function allows the operator to enable the Energy Savings mode function and set
the idle time. Once the set idle time has expired, the operator can choose to have the
heaterseitherturnoff,orreducethetankholdingtempto140°F(60°C).
This function allows the operator to enable the Freshness Alert and set the expiration
time. The expiration time is the amount of time the product is allowed to sit in the server/
dispenser before a fresh batch is brewed.
UNITS
Metric ENG
DONE
REVIEW RECIPES ?
NO YES
ASSIGN RECIPE ?
NO YES
SET NEW RECIPE ?
NO YES
MASTER TEMP 205
O
(-) (+)DONE
ENABLE ADS ?
NO YESDONE
ENABLE SANITATION
NO YESDONE
ENABL ENERGYSAVR
NO YES
DONE
ENABLE FRESH TIMER
NO YESDONE
Set Language?
NO YES
READY DEGREE 5
O
(-) (+)DONE

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Thisfunctionallowstheoperatortoadjustthesensitivityoftherellcircuit.Thisis
mainly a troubleshooting feature. Water in different geographical locations can have
differentconductivities.Byadjustingthesensitivityoftherellcircuit,thiswillallowthe
brewer to operate under various water conditions.
Thisfunctionallowstheoperatortovieworentertheactualowratecomingoutofeach
sprayhead.ThisisNotusedtocontroltheactualowrate,buttotelltheinternalproces-
sorhowfastthewaterisowing.
Thisfunctionallowstheoperatortoviewortoentertheactualowratecomingoutof
thedilutionnozzle.Thisisnotusedtocontroltheactualowrate,buttotelltheinternal
processorhowfastthewaterisowing.
Thisfunctionallowstheoperatortotestandentertheactualowrateofthe
sprayhead(s) and the bypass/dilution for each side of the brewer by dispensing each
separately for one minute. The volumes are then entered into the brewer.
This function allows the operator to track the total number of brew cycles completed, as
well as the number of batches brewed using each of the brew buttons. There are (up to)
three resettable counters, and one life counter that is not resettable.
This function allows the operator to set separate temperatures for each selected recipe.
This function allows the operator to enter the machine’s asset number. This can be use-
ful for tracking the usage or service of an individual machine within a group.
This function allows the operator to enter in the telephone number to call if service is
needed. The service number will be displayed anytime there is a fault message dis-
played.
(ForAuthorizedServicePersonelOnly)
This function allows the testing of individual components and the ability to check
switches for proper function. This function also tests the funnel sensor coil’s frequency
(diagnostic tool for troubleshooting purposes only).
Refer to Service Manual for in depth procedures.
This function allows the operator to erase all of the previously entered recipes and ad
messages. Factory-set default values will replace All previous settings.
XX REFILL XXX
(-) (+)DONE
SPRAY OZ/M: XX.X
(-) (+)DONE
DILUTE OZ/M: XX.X
(-) (+)DONE
CALIBRATE FLOW?
NO YES
BREW COUNTERS?
NO YES
SET RECIPES TEMPS
NO YES
ENTER ASSET #
NO YES
ENTER SERVICE #
NO YES
SERVICE TOOLS
NO YES
FACTORY DEFAULTS
NO YES

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Uploading a Recipe Using a Recipe Card
The recipe card includes all the information needed to set up that particular tea/coffee name. The information from
the recipe card is loaded into the brewer’s memory by holding the chip area up to the brewer’s sensing coil. This
information can include all the recipe settings for that particular name. These can all be loaded in seconds.
Note: Instructions to program the brewer are printed on the recipe card, along with the tea or coffee name that is be-
ing programmed.
Procedure to program the coffee name:
Step 1: Remove the funnel.
Step 2:Positiontherecipecardvertically,sothatthetopendofthechipisbeneaththesensingcoil(locatedonthe
under side of the front panel).
Step 3: After a short pause the display will read “Card Contains Recipe For” then will change to “Recipe Name”
(SHOW-QUIT-SAVE). All brewing parameters for that recipe are now transferred from the card to the brewer.
Step 4: To show (view) this information, press and release SHOW. The display will scroll through all of the brew set-
tings for that recipe. This display will then return to “Card Contains Recipe For” then will change to “Recipe Name”
(SHOW-QUIT-SAVE).
Step 5: If all brew settings are correct, press SAVE. The display will read “Recipe Name Setup Complete”. All brew
settings for that name are now stored in the Brewer’s memory.
Step 6: If the brewing information is not correct, or it is desired to exit the setup before the settings are loaded into
the brewer’s memory, press QUIT. The display will read “Recipe Name Not Saved”. The display will then return to the
main screen.
Note: This just saves the recipe in the brewer’s memory. To use for brewing, you must still assign the recipe
to a brew button.
Calibrating the Sprayhead Flow Rate
Step 1:Placeameasuringcontainerwithaminimumcapacityof60ouncesbeneath
the funnel of the brewer. Water can also be dispensed into the server and then into
the measuring container.
Step 2:Pressandholdtherighthiddenswitchtoenterlevel2programming.Continue
to press the right hidden switch until the display reads “Calibrate Flow?”.
Step 3:PressYEStoadvancetothe“SprayHeadCal?”functionscreen.
Step 4:PressYES.Thedisplaywillread“ContainerReady?”Ifthecontainerisunderthe
funnel,pressYES.Thedisplaywillread“CalibrateSpray…PressBrewtoStart”.
Step 5:PressandreleasetheBREWswitch(onthesidetobecalibratedforDualBrewers).
Thedisplaywillread“CalibrateSpray…60SectoFinish”.The60secondtimeronthe
display will count down to zero. When the counter reaches zero, the display will change to OZ,
along with the existing ounces per minute.
Step 6: Measure the amount of water in the container and using the (-) or (+), adjust the amount
on the display to match the amount in the container. Then press DONE.
Step 7:Thedisplayshouldnowread“NewSprayFlow”alongwiththecorrectowrateofthe
sprayhead in ounces per minute. After 5 seconds, the display will return to the “Calibrate Flow?”
screen.
SPRAYHEAD CAL
NO YES
CALIBRATE FLOW?
NO YES
BREW
COUNTERS
CONTAINER READY ?
QUIT YES
CALIBRATE SPRAY
QUIT START
CALIBRATE SPRAY
60 SEC TO FINISH
SPRAYHD OZ XX.X
(-) DONE (+)
NEW SPRAY FLOW
XX.X OZM
CALIBRATE FLOW?
NO YES
5 sec

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Calibrating the Dilution Flow Rate
Step 1:Placethemeasuringcontainerwithaminimumcapacityof130ouncesbeneaththe
dilution nozzle on the brewer. Water can also be dispensed into the server and then into the
measuring container.
Step 2:Pressandholdtherighthiddenswitchtoenterlevel2programming.Continue
to press the right hidden switch until the display reads “Calibrate Flow?”.
Step 3:PressandreleaseYEStoadvancetothe“SprayheadCal?”functionscreen.
Step 4:PressandreleaseNOtoadvancetothe“DilutionCalibration”screen.
Step 5:PressYES.Thedisplaywillread“ContainerReady?”Ifthecontainerisunder
thenozzle,pressYES.Thedisplayshouldread“CalibrateDilute..PressBrew
to Start”.
Step 6:PressandreleasetheBREWswitch.Thedisplaywillread“CalibrateDilute....
60SectoFinish”.The60secondtimeronthedisplaywillcountdowntozero.Whenthe
counter reaches zero, the display will change to “Dilute OZ/M” along with the existing
ounces per minute.
Step 7: Measure the amount of water in the container and using the (-) or (+), adjust the
amount on the display to match the amount in the container. Then press DONE.
Step 8:Thedisplayshouldnowread“NewDiluteFlow”alongwiththecorrectowrate
of the bypass in ounces per minute. After about 5 seconds, the display will return to the
“Calibrate Flow?” screen.
Master Tank Temp
The Master tank temperature is the maximum temperature for the tank. The Set Recipe Temps
allows the operator to set temperature for all recipes and will override the Master temp.
Explanation:
Setting recipe temps will override the Master Temp. The tank will hold at the lowest temperature between the three
selected recipes stored in the brew buttons. For instance, let’s say Brew A’s recipe tem¬perature is set at 205°, Brew
B’s recipe temperature is set at 205°, and Brew C’s recipe temperature is set at 200°. The tank will hold at 200°. If
Brew A or Brew B is pressed, the tank will heat to the 205° temperature. The brew button must be pressed again in
order for a brew to start. After the completion of that brew, the tank will return to the 200° holding temperature. It may
take awhile for the tank to return to the lower temperature.
Factory Default Values
Brew Lockout Disabled
Set Language English
Units English
Master Temp 205º
Ready Degree 5º
Enable Ads Disabled
Enable Sanitation Disabled
Enable EnergySavr Disabled
Enable Fresh timer Disabled
Rell   155
Spray Oz. 24.0
Dilution Oz. 71.0
Set Recipe Temps Coffee: 200º/Tea: 205º
SPRAYHEAD CAL
NO YES
CALIBRATE FLOW?
NO YES
BREW
COUNTERS
DILUTION CAL?
QUIT YES
CONTAINER READY?
QUIT YES
CALIBRATE DILUTE
QUIT START
CALIBRATE DILUTE
60 SEC TO FINISH
NEW DILUTE FLOW
XX.X OZM
CALIBRATE FLOW?
NO YES
DILUTE OZ XX.X
(-) DONE (+)
5 sec

Unit Objectives
Un i t 3 Ma c h i n e co M p o s i t i o n
Given a realistic scenario in which the learner has access to the machine’s internal components the learner
will understand the composition and functions of the brewer.
Given a realistic scenario requiring the learner to access the internal components of the machine the
learner will be able to remove rear panel and top panel.
The learner will remove the rear panel and top panel.
Given an operating machine the learner will be able to give a general explanation of how the unit
operates.
The learner will be able to identify the functions of the main control board .
  Thelearnerwillbeabletoidentifythecomponentsandfunctionsofthellingsystem.
The learner will be able to identify the components and functions of the heating system.
The learner will be able to identify the components and functions of the dispensing system.
The learner will be able to identify the components and functions of the dilution system.

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Machine Composition
Exterior Overview
Product Outlets and Removable Parts
User interface (A)•
Display (B)•
Hot water outlet (C)•
Sprayhead (D)•
Dilution Nozzle (E)•
Funnel sensing coil (F)•
Data plate (G)•
Flip down tray (H)•
On/off switch (on the side)•
User Interface
The user interface is a membrane switch adhered to the front of the brewer. The membrane is connected to the
control board by a ribbon cable. The user interface allows the user to select the product, batch size and to begin
the brew cycle.
The machine’s display is mounted to the control board. The display is visible on the front of the machine and
provides information to the user and to the technician.
A. Programming (right)
Pressingandholdingthispadallowsentryintotheprogrammingmenus.Pressingandreleasingthepadsteps
through each function screen while in the programming mode.
B. Programming (left)
This hidden pad can be used to scroll backwards through the function list while in programming mode.
C, D, E. Brew (A, B, C) and Function
When the ON/OFF is ON and the brewer is on the main screen (not in programming mode), momentarily press-
ing and releasing this pad will begin a brew cycle. These are also used to program the brewer when in the
programming mode.
F. On/Off Switch
Pressingthe“ON/OFF”padwillalternatelyturnthebreweronandoff.Pressingthispadduringthebrewcycle
willinterruptthebrewcycle,stoppingtheowofwater.Pressingthispadduringprogrammingofthebrewerwill
exit the setup and return to the main screen.
G.BATCHSELECTORPADS
PressingthepadcorrespondingtotheHalforFullbatchselectstheamountofproducttobebrewed.Pressing
a different pad after a brew cycle has been initiated does not change the brew batch in progress. Light indicates
the selected batch to brew. Also used in programming to adjust settings on both batch sizes.
A
B
C
D
E
G
H
F
HALF
FULL
BREW
A
BREW
B
BREW
C
®
ENABLE
ON / OFF
BREW
A
B
C D E
READY TO BREW
WATER TEMP: 200°
F
G

ITCB Training Manual
14
Accessing the Inside of the Brewer
The majority of service work to the ITCB brewer will require the removal of either the rear panel or the top panel. The
toppanelissecuredwith1atheadscrew.Therearpanelissecuredwitheither6,7or10atheadscrews,depend-
ing on the age of the machine.
Machine Function and Operations
Main Control Board
The main control is the brain of the brewer. In the Digital Brewer Control (DBC®) system, the control board is the
single component that contains all of the programming software, it interprets all the data it receives from the level and
temperaturesensorsandactivatescomponentstofulllthosedemands.Themaincontrolboardrespondstothe
users input through the membrane switch and activates and controls the brew cycle. The control board can receive
data from Smart Funnels®through a sensing coil on the front of the machine.
In a digital tea brewer the control board takes the place of the liquid level control board, the timer board, the dilution
timer and the mechanical thermostat. All of these components are combined into a single unit.
Filling System
Thellsystemmaintainsthelevelofwaterinthebrewer’stank.Any-
time water is drawn off of the tank during a brew cycle or from the hot
wateroutlet,thellcircuitactivatestorellthetank.
Thellsystemconsistsof:
120VAC solenoid inlet valve•
Flow control•
Fill probe•
Waterenterstherearofthebrewerfromthesupplylineandrstgoes
through a plastic strainer mounted in the combination inlet solenoid/
dilutionsolenoidassembly.Fromthesolenoidvalvethewaterows
througha.50gallonperminuteowcontrolwasherandthenintothe
bottom of the water tank.
The 120VAC solenoid inlet valve is activated by the control board anytime the brewer calls for water. The valve opens
andallowswatertoow,underlinepressure,tothetankwherethesilicontubeconnectstoalltubeattachedtothe
tank.
The control board monitors the level of water in the tank through a low voltage level probe mounted to the top of the
tank. The control board grounds a 2.5VAC signal to the tank through the water. If it looses this signal, the control
board will activate the inlet valve.
Heating System
The heating system consists of:
Water tank•
Heating elements•
High-limit thermostats•
Temperature sensor•
DV switch•
The heating circuit maintains the water in the tank at a preset temperature this ensures that the water is always ready
for brewing.
TO DILUTION NOZZLE
TO T A NK
.50 GPM flow control
.50 GPM flow control Checkvalve
Drain clamp
Dilution solenoid
Inlet solenoid
inlet connection adapter

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Water for brewing is contained in a 200 ounce stainless steel tank. This tank contains a
1680W@120VACheatingelementthatispoweredbythelinevoltageintothemachine.
The heating element is controlled by the control board through a mechanical relay. The
dualvoltageITCBbreweraddsanadditional1800Wfor208/240VACheatingelement;
the two elements are wired in series.
The control board monitors the water in the tank by a temperature sensor that is in
contactwiththewater.Thistemperaturesensorisadigitalthermistor;thecontrolboard
reads the temperature as value of resistance. The temperature sensor allows the control
board to trigger the heating element triac when the temperature drops below its pro-
grammed value and shut down the trigger voltage when the water temperature reaches
the programmed holding value.
Dispensing System
The dispensing system consists of:
Dispense valve•
Sprayhead•
Funnel•
The ITCB brewer is a gravity dump brewing system. During the brew cycle the
dispensevalvewillopenallowingwatertoowfromthetanktothesprayhead.
The dispense solenoid is 120VAC valve. The sprayhead not only serves to dif-
fusethewaterovertheproductbutalsoservesastheoutletowcontrol.
For coffee brewing the ITCB can be programmed with pulse brew routines.
The control board will open and close the dispense valve multiple times during
the brew cycle.
Because the ITCB can brew both coffee and tea it can accept multiple funnels.
For tea brewing the funnel will have a small outlet restrictor to facilitate the
water have a longer contact time with the tea (steeping) and a strainer screen
to prevent tea leaves from following to the server. For coffee brewing the ITCB
can accept a standard coffee funnel or a Smart funnel.
Dilution System
The dilution system consists of:
Dilution valve•
Flow regulator•
Dilution nozzle•
The ITCB features quick brew by default, but a delay can be programmed. The brewer will dump water directly
into the tea server to dilute the tea concentrate during the tea brew cycle. The dilution solenoid is a 120VAC valve
mountedontothesamebodyastheinletsolenoid.Duringateabrewcycle,thedilutionsolenoidwillopen;waterwill
owthrougha.50GPMowcontrolwasherandoutofthedilutionnozzle.
Te mperature sensor
High limit thermostat
Heating element
Dispense valve
Dispense tube
Sprayhead
S
M
A
R
T
F
U
N
N
E
L
SmartfunnelTea funnel
strainer screen
outlet restrictor

Unit Objectives
un i t 4 pr e v e n t i v e Ma i n t e n a n c e
Given a realistic scenario depicting a machine requiring a preventive maintenance, the learner will be able to
identify which elements of a component need to be serviced without error.
Given a machine, all the necessary tools and safety equipment, the learner will be able to identify the
 componentsthatneedtobeservicedforthePM.

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In order to maintain proper operation and long service life BUNN recommends performing the preventative main-
tenanceevery6months.Individualcustomerswillvarywithsomecustomerschoosingnottoreceivepreventative
maintenance.
Tools Required:
Flat blade screwdriver•
Channel lock pliers•
Needle nose pliers•
Delimingtool(BUNNP/N:38227.0000)•
Priortoservicingthebrewer:
Disconnect the electrical supply•
Shut off the water supply•
Remove the top panel•
Drain the tank (see below)•
Draining the Tank
Step 1:Useaatbladescrewdrivertoremovethe7or10screwssecuringtherearpanelontothechassis,remove
the panel.
Step 2: Locatethehoseclamponthelltube,andclampoffthewaterline.
Step 3:Removetheclipsecuringthebottomendofthelllinetothecheckvalveandremovethelinefromthe
check valve.
Step 4:Placethewaterlineoverasinkorbucketandremovethehoseclamptoallowthetanktodrain.
PM Steps
Step 1: Disassemble and clean the strainer assembly:
UseChannellockplierstoremovethe¼”areto¾”hosethreadadapterttingfromthewaterinletassembly□
Use needle nose pliers to gently pull the strainer straight out.□
Rinse the mesh screen to remove any debris build-up.□
Reassembly is the opposite of disassembly.□
Step 2: Remove and clean the temperature sensor:
Gently pull the temperature sensor from the grommet in the top of the tank.□
Wipe any mineral build-up from the probe.□
Reinstallation is the opposite of removal.□
Step 3:Removeandcleanthellprobe:
Gentlypullthellprobeoutofthegrommet.□
Wipe any mineral deposits off of the probe.□
Reinstallation is the opposite of removal.□
Step 4: Remove and clean the sprayhead:
Using the pointed end of the deliming tool, remove any mineral build-up from the sprayhead outlet holes.□
Cleansprayheadtting□
Step 5: Rebuild the dispense solenoid:
Remove the hose clamps that secure the tubing to the valve.□
Remove the two nuts that hold the solenoid bracket to the machine.□
Gently remove the tubing from the valve body.□
Usingaatbladescrewdriver,removethefourscrewsandseparatethevalve □
assembly.
Replaceplunger,spring,andrubberseatusingtherebuildkitBUNNP/N: □
11517.0008.
Clean any mineral build-up from the valve.□
Reassembly is the opposite of disassembly.□

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Step 6: Replace the seat cup in the hot water faucet:
Unscrew the faucet bonnet from the assembly.□
Remove the old faucet seat cup.□
InstallthenewseatcupBUNNP/N:02766.0000.□
Reassembly is the opposite of disassembly.□
Visually examine the power cord for any damage.□
Visually examine the water supply for any leaks.□
Step 7: Clean the funnel:
Unscrew the outlet tip and remove the tip and screen.□
Sanitize the tip, screen, and funnel with warm water and sanitize solution.□
Step 8: Replace the tea server seat cups:
Drain the server.□
Unscrew the faucet handle.□
Remove and replace the seat cup.□
Step 9:Calibratethesprayheadanddilutionowrates.

Unit Objectives
un i t 5 tr o u b l e s h o o t i n g
Given a realistic scenario depicting a broken machine, the learner will be able to effectively troubleshoot,
diagnosis, and repair the problem returning the machine to normal operation.
Given a machine displaying an error message, all the necessary tools and safety equipment, the
learner will be able to diagnosis the problem.
Given a list of error messages and issues, the learner will be to identify the probable cause of the
message or issue.
Given a brewer with a defective component, the learner will be able to test the component to deter
mine the cause of the defect.

ITCB Training Manual
20
Service Tools
The ITCB brewer features on-board troubleshooting. Since all of the machine’s components are controlled or activat-
ed by the control board you can activate and test components individually from the user interface. This allows you to
listentosolenoidvalvesopening,observingtheowofwaterortesttoseeifacomponentisreceivingvoltageusing
a meter.
The Service Tools option is located in Level 2 of the programming. Enter level 2 programming by pressing and hold-
ing the right hidden switch for 5 seconds. Use the right hidden switch to scroll to the Service Tools Screen.
PresstheBrewCbuttontoselectYes.ThiswillentertheServiceToolsfeature.
IntheServiceToolsselectionthereare3screensavailable,byselectingYes,youwillenterthattestfunction,by
selecting NO you will move to the next test.
Outputs- Test Outputs supplies voltage to load components in the brewer
Switches- Tests the inputs from the membrane switch
Frequency- Indicates the transmit frequency of the funnel sensing coil
Test Outputs
The following components can be tested individually:
Brew valve•
Dilution valve•
Rellvalve•
Tank heater triac•
Sweetener valve•
HALF
FULL
BREW
A
BREW
B
BREW
C
®
ENABLE
ON / OFF
BREW
Right Hidden Switch
BREW
A
BREW
B
BREW
C
SERVICE TOOLS
NO YES
TEST OUTPUTS?
NO YES
TEST SWITCHES?
NO YES
TEST FREQUENCY?
NO YES
TEST OUTPUTS?
NO YES