Bunn ITB Installation guide

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 ......................................................................................................................21
Test Outputs .................................................................................................................21
Test Switches ............................................................................................................... 22
Test Frequency............................................................................................................. 22
Service Fault Messages ..................................................................................................... 22
Triac Map ............................................................................................................................. 23
© 2009 Bunn-O-Matic Corporation. All Rights Reserved
Rev. A

Unit Objectives
Unit 1 installation
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1.00GPM
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
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.
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.
Step 1: Plugbrewerintothepowersource.
Initial Start-Up
Step 1:PlacethemainpowerswitchintotheOnposition.
Whenthemachineisturnedon,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
Unit 2 setup
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.
The learner will be able to assign recipe.
The learner will be able to modify recipe.

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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
Dip switch number 4 locks out the memory and constant value
change is not possible. The program menus are then used as read
only status without saving any changes. The dip switch is located
top left side of the CBA, facing the front of the brewer. All four dip
switches are in order and has a number represented next to each
dip switch. Number 1 starts on bottom and number 4 dip switch is
closest to the top of the brewer. Currently dip switches 1 through 3
are not used. ON- Represents dip switch is locked.
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
ENABLE
ON / OFF
BREW
BREW
A
BREW
B
BREW
C
®
AB
CDE

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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 various tea 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 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
message. An ad can be saved to the brewer by writing the ad using the programming
commands. 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.
Thisfunctionallowstheoperatortoadjustthesensitivityoftherellcircuit.Thisismain-
ly 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.
UNITS
Metric ENG
DONE
REVIEW RECIPES ?
NO YES
ASSIGN RECIPE ?
NO YES
SET TEMP 200
O
(-) (+)DONE
ENABLE ADS ?
NO YESDONE
ENABLE SANITATION
NO YESDONE
ENABL ENERGYSAVR
NO YES
DONE
ENABLE FRESH TIMER
NO YESDONE
XX REFILL XXX
(-) (+)DONE
SPRAY OZ/M: XX.X
(-) (+)DONE
Set Language?
NO YES
READY DEGREE 5
O
(-) (+)DONE

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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 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PersonnelOnly)
This function allows the testing of individual components and the ability to check
switches for proper function.
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.
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.
DILUTE OZ/M: XX.X
(-) (+)DONE
CALIBRATE FLOW?
NO YES
BREW COUNTERS?
NO YES
ENTER ASSET #
NO YES
ENTER SERVICE #
NO YES
SERVICE TOOLS
NO YES
FACTORY DEFAULTS
NO YES
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.
Assign Recipe to Brew Switch A, B or C
The Assign Recipe function allows the operator to assign one recipe to each of the three brew switches labeled A, B
or C with the option of disabling a brew switch if desired. A recipe must be assigned to a brew switch in order to brew
a batch of tea. The machine will have a total of six recipes in the Recipe list. Iced Tea, Other Tea, Green Tea, Sweet
Tea, Flavored Tea, and Iced Coffee. When you select “yes” for Assign Recipe menu, the machine will prompt set up
menus for each of the brew switches starting with A and end with brew button C.
Procedure to Select Switch Recipes
Step 1:PressandholdtherighthiddenswitchuntilthedisplayreadsSETLANGUAGE.
PresstherighthiddenswitchuntilthedisplayreadsASSIGNRECIPE?PressYES.
Step 2: ThedisplayshouldnowreadSELECTRECIPEBREWSWITCHA.
Step 3: Using (-) and (+), scroll through the stored recipes in the brewer’s memory until the
desired recipe name is reached.
Step 4: Select DONE to set that recipe for brew switch A.
Step 5:ThedisplayshouldnowreadSELECTRECIPEBREWSWITCHB.
Step 6: Using (-) and (+), scroll through the stored recipes in the brewer’s memory until the
desired recipe name is reached.
Step 7: Select DONE to set that recipe for brew switch B.
Step 8:ThedisplayshouldnowreadSELECTRECIPEBREWSWITCHC.
Step 9: Using (-) and (+), scroll through the stored recipes in the brewer’s memory until the
desired recipe name is reached.
Step 10: Select DONE to set that recipe for brew switch C.
Procedure to Disable a Brew Switch
Step 1: Follow the same procedure as above. Choose Disabled instead of recipe name.
Step 2: Select DONE to disable that brew switch.
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
ASSIGN RECIPE
NO YES
SELECT RECIPE
<-<-<-BREW SWITCH A
"RECIPE NAME"
(-) DONE (+)
"RECIPE NAME"
(-) DONE (+)
SELECT RECIPE
<-<-<-BREW SWITCH B
"RECIPE NAME"
(-) DONE (+)
SELECT RECIPE
<-<-<-BREW SWITCH C

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Adjust Batch Levels by Adjusting Recipe
Enter level 2 programming and scroll to “Review Recipes” and select the recipe
you want to modify. Select a recipe and depress the modify button to enter the
recipe adjustment menus. A tea recipe is made up of three adjustment parame-
ters (brew water, dilute ounces and dilute delay) with the option of setting pulse
brew on the brew water ounces.
Brew Ounces – Amount of hot water delivered into the tea basket.
Dilute Ounces – Amount of tap water delivered to dilute the hot tea concentrate.
Dilute Delay – Amount of time allowed for tea to steep before introducing the
dilute water.
PulseBrew–Routineofdeliveringhotwateroverteainsegmentswithinthe
brew ounces.
Drip Time – Countdown of time after a brew cycle to inform the operator status
of funnel.
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 Disabled
REVIEW RECIPES
NO YES
BREW OZ: 76
(-) DONE (+)
DILUTE OZ: 320.0
(-) DONE (+)
DILUTE DELAY 00.0
(-) DONE (+)
TEA 1
MODIFY SHOW NEXT
SET PULSE BREW?
NO YES
DRIP TIME: 1:20
(-) DONE (+)
SELECT METHOD
EASY MANUAL

Unit Objectives
Unit 3 Machine coMposition
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)
• Sprayhead(C)
• DilutionNozzle(D)
• Dataplate(E)
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.
HALF
FULL
ENABLE
ON / OFF
BREW
BREW
A
BREW
B
BREW
C
®
A
B
C D E
READY TO BREW
WATER TEMP: 200°
F
G
A
B
C
D
E

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Accessing the Inside of the Brewer
The majority of service work to the ITB 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7atheadscrews.
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us-
ers input through the membrane switch and activates and controls the brew cycle.
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.Anytime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 dual solenoid inlet valve
• Flow control
• Fill probe and CBA
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con-
nects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
The heating circuit maintains the water in the tank at a preset temperature this ensures that the water is always ready
for brewing.

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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 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/voltage. The temperature sensor allows
the control board to trigger the heating element triac when the temperature drops below
its programmed 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 ITB 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rated120VACbutisrectiedinternallyinthecoil.
Thesprayheadnotonlyservestodiffusethewaterovertheproductbutalsoservesastheoutletowcontrol.
Tea brewing can be programmed with pulse brew routines.
The control board will open and close the dispense valve
multiple times during the brew cycle. Anytime a recipe is
set to a brew value of 86 ounces and higher will result in a
constant value pulse routine (:30/:15/:15). This will prevent
thepossibilityofthefunnelfromoverowing.
The tea brew funnel will have a small outlet restrictor to
facilitate hot water to have a longer contact time with the
tea (steeping) and a strainer screen to prevent tea leaves
fromfollowingtotheserver.Youwillhavetheoptionof
converting to quick brew by simply programming dilute
delay menu to OFF position and changing out funnel restrictor to a larger diameter opening.
PN:01037.0002-FunnelTip&ScreenKit.082”DiaSTANDARDBREW
PN:01037.0003-FunnelTip&ScreenKit.114”DiaQUICKBREW
Dilution System
The dilution system consists of:
• Dilution valve
• Flow regulator
• Dilution nozzle
The ITB can be setup as standard or quick brew. 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.
SPLASHGARD
®
US PAT. NO. 6,055,900, 6,497,818 PAT. PEND.

Unit Objectives
unit 4 preventive Maintenance
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:
• Slotted screwdriver
• Slip joint pliers
• Needle nose pliers
• Adjustable wrench
• DelimingKey(BUNNP/N:38227.0000)
• Bristlebrush(BUNNP/N:00674.0000)
PMParts:
• Kay-5Sanitizer(BUNNP/N:24634.0001)
• ReservoirFaucetSeatCup(BUNNP/N:00600.0000),recommendedonceamonthforreplacement.
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 slotted screwdriver to remove the 7 screws secur-
ing 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owcontrol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: Disassembleandcleantheowcontrols.
□ Useadjustablewrenchandplierstoremoveandtakeaparttheowcontrolassemblyonthetankllline,clean
 thehousingand.500owwasher.
□ Useadjustablewrenchandplierstoremoveandtakeaparttheowcontrolassemblyonthedilutionline,clean
 thehousingand.500owwasher.
□Reassembly is the opposite of disassembly.
Note:Theowwasherandhousingmustbeinstalledcorrectly.Waterentersontheatsideorletteringside
 oftheowwasherandex’sthewasheragainstthetmenthousing.
To Tank
Step 2: Hose Clamp
Step 3: Remove snap clamp and hose

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Step 3:Removeandcleanthetemperaturesensorandrellprobe:
□ Gentlypullthetemperaturesensorandrellprobefromthegrommetinthetopofthetankoryoucanremove
entire tank lid by removing a total of 8 – 8/32 hex nuts.
□Clean any mineral build-up from the probe.
□Reinstallation is the opposite of removal.
Step 4: Remove and clean the sprayhead:
□Using the pointed end of the deliming key, remove any mineral build-up from the sprayhead outlet holes.
□ Cleansprayheadtting
Step 5:Cleantankdispenseoutlettting:
□ Removethehoseclampthatsecurestubingtothetankdispenseoutlettting.Removalofthetanklidmaybe
required depending upon the severity of the mineral build-up.
□ Removesiliconehosefromtanktting.
□ Cleaninsideoftankttingofanymineralbuild-up.
□Reassembly is the opposite of disassembly.
Step 6: 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 7: Clean and sanitize the dispenser:
□Simply pour the cleaner/sanitizer into an empty dispenser. Run a complete brew cycle of water into the dispenser
and let it set for a minute. Thoroughly clean the inside of the dispenser using the sanitizer solution. Empty the
dispenser and thoroughly rinse with warm water.
□ Recommendedonceamonth,replacethefaucetseatcup(BUNNP/N:00600.0000).Discardtheoldseatcup.
□Remove the faucet handle/stem assembly by unscrewing the faucet bonnet just beneath the faucet handle. Use
the cleaning brush to thoroughly clean the inside of the faucet and the faucet shank from inside the dispenser.
□Disassemble the faucet/stem assembly. The faucet cleaning procedure requires a 3-compartment sink. Thor
oughlywashallfaucetpartsinamilddetergentandwatersolutionintherstsink.Rinsethepartsinhotwaterin
the second sink. Sanitize the parts for one minute in 75° F warm chlorine solution (50 -100 ppm) in the third sink.
Do not use full-strength bleach, but a solution with water, of 50 - 100 ppm of chlorine. Reassemble the faucet
and attach it to the dispenser.
□Wash the entire outside surface of the dispenser with a clean damp cloth.
Step 8: 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 9: IfcustomerhasaBUNNwaterltrationsysteminstalledbeforethedispenser,replacethelterorltercar-
tridgeandrecordtheservicereplacementdateonthelter.
Step 10:Calibratethesprayheadanddilutionowrates.

Unit Objectives
unit 5 troubleshooting
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.