Bunn My Cafe AP Installation guide

BUNN®TECHNICAL TRAINING
My Cafe® AP

Index
Unit 1: Installation
Site Requirements .............................................................................................................. 4
Location of the Serial Number .......................................................................................... 4
Water Supply Install ........................................................................................................... 4
Initial Start-Up .....................................................................................................................5
Unit 2: Setup
User Interface...................................................................................................................... 7
Switch/Display Board and Decal Button Layout....................................................... 7
Operation ......................................................................................................................7
Programming Lockout Switch........................................................................................... 7
Programming Menus.......................................................................................................... 8
Calibrating Flow Rate......................................................................................................... 10
Coffee Brewing ...................................................................................................................11
Unit 3: Machine Composition
Exterior Overview ............................................................................................................... 13
Accessing the Inside of the Brewer.................................................................................. 13
Machine Function and Operations.................................................................................... 14
Main Control Board...................................................................................................... 14
Filling System...............................................................................................................14
Hot Water Dispense ..................................................................................................... 15
Brew Dispense ............................................................................................................. 15
Heating System ............................................................................................................ 16
Ejector Assembly ......................................................................................................... 17
Unit 4: Preventive Maintenance
Preventive Maintenance..................................................................................................... 19
PM Steps .............................................................................................................................19
Unit 5: Troubleshooting
Service Tools ......................................................................................................................23
Test Outputs .................................................................................................................23
Index Motor...................................................................................................................24
  SetRellThreshold ..................................................................................................... 25
Level 3 Programming ......................................................................................................... 25
Warning Messages ............................................................................................................. 26
Error Messages................................................................................................................... 26
Tank Draining...................................................................................................................... 27
Index Motor Alignment Procedure.................................................................................... 28
Index Motor Assembly Removal................................................................................. 28
Index Motor Assembly Replacement ......................................................................... 28
Triac Map ............................................................................................................................. 29
Symptom Reference Guide................................................................................................ 29
© 2012 Bunn-O-Matic Corporation. All Rights Reserved
Rev. B

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
customer 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 to the My Café AP.
The learner will be able to power up and perform the initial set-up of the brewer.

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4
Installation
Site Requirements
Space
• My Café AP is only for indoor use on a sturdy counter or shelf
• My Café AP dimensions are 15.79”H x 9.5” W x 18.4” D (40.1cm H x 24.13cm W x 46.73cm D)
• Weight 30 lbs (13.6 kg.)
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
• Elbow adapter tting provided to convert to ¼” male are tting
• Dedicate water supply with shut-off
• Connected to the cold water supply
• Water pressure 20-90psi, set to 50psi if regulator is needed
• If a backow preventer is required by code, a shock arrestor should be installed close to the ma
chine between the backow preventer and the machine
Electrical
• 120VAC, 2 wire plus ground
• Dedicated 15Amp circuit breaker
• Receptacle within 5 feet of machine
Location of the Serial Number
The machine’s serial number is located on the data plate which is located on the lower front panel behind the waste
bin and drip tray. The serial number half tag can be found on the inside of the machine attached to the left side wall.
Removing top lid will give you access to the serial number only tag.
Water Supply Install
Step 1: Check water pressure, if above 90 psi, install pressure regulator and set to 50 psi before water lter.
Step 2: Install water lter and purge before installation.
Step 3: Securely attach the adaptor elbow
assembly to the ¼” water supply line from
the lter.
Step 4: Securely attach adapter elbow as-
sembly to the .75-11.5 NH (Hose Thread)
tting at the rear of the brewer and turn on
the water supply.

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Initial Start-Up
Step 1: Place a large empty cup (10 oz. or more) under the brew chamber.
Step 2: Connect the brewer to the power source.
Step 3: Water will ow into the tank and stop when the tank is lled to its capacity.
Step 4: Wait approximately ten minutes for the water in the tank to heat to the proper temperature. Display will show
HEATING until tank reaches its operating temperature.
Step 5: When heated, press and release th open door switch and close door by pressing the same switch.
Step 6: Press the large Brew Switch. Water will ow into the cup. When nished, discard contents of cup.
Step 7: Water volumes and ow settings have been preset at the factory. Refer to adjustments for the Set Brew Vol-
umes section of this manual should the volume need to be increased or decreased.
8. The brewer is now ready for use in accordance with instructions for coffee brewing.
BREWING COMPLETE
PRESS POD
IN DRAWER
PRE-INFUSION
FLOW COUNTS XXX
HEATING
PLEASE WAIT
DOOR OPENING
PLEASE WAIT
TANK FILLING
Select Brew
ENJOY YOUR BEVERAGE
PLEASE WAIT
Flow Counts
PRESS CLOSE
BREWING COMPLETE
PLEASE WAIT
Brewing

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 customer 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 operate the switch controls.
The learner will be able to enter programming.
The learner will be able to perform the brew inlet ow calibration.
The learner will be able to perform a brew process.

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Setup and Programming
User Interface
The switch decal adheres to the front housing over the electronic switch and LCD (Liquid Crystal Display) board. The
mechanical switches are mounted directly onto the electronic board with a button mounted on the stem for product
actuation. The switch decal is nothing more than a overlay with description of the buttons. The user interface allows
the user to program the brewer for product recipes and begin the brew process with the selection of large or small
cup. The My Café AP brewer also gives the user the option of a Hot Water dispense.
Switch Operation “Programming”
Switch Operation “Operating Controls”
Programming Lockout Switch
The programming lockout switch is located on the main control board. This switch can
be set to prevent access to the programming settings of the brewer. Once all the cor-
rect brew settings are programmed, the operator can set the switch to the “On” position
to prohibit anyone from changing the settings. With the switch in the “On” position, the
programming menus can still be accessed to view the current settings. However, no
changes will be saved.
To access the lockout switch:
Step 1: Disconnect brewer from power source before removing any panel.
Step 2: Access the rear of the machine.
Step 3: Remove the rear panel by removing six standard screws.
OPEN/CLOSE
This is used to open
or close the pod
holder door.
LARGE BREW
Preset but can be
adjusted.
HOT WATER
Push and hold for dis-
pensing hot water only
(Max 10 oz).
SMALL BREW
Preset but can be ad-
justed.
HIDDEN SWITCH
Step forward through
screens
OPEN/CLOSE
"NO" or (-)
LARGE BREW (A)
"DONE"
HOT WATER
"YES" or (+)
SMALL BREW (B)
Step backwards through
screens
HIDDEN SWITCH
Press until display reads
"BREW LOCKOUT"
St

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8
“On Position/Locked”
The following menu screens will appear to inform you that programming is locked, but still can be accessed to view
current settings.
Programming Menus
Brew Lockout
Prevents brewing if the water temperature is less than the “SET READY” temperature.
Brew Oz (A/B) (1-16)
Adjusts the brew volume.
Brew Meter (A/B) (1-5)
Simplied pulse brew adjustment. 1=Preinfusion, 2-5=Pulse brew. 2 being the shortest
pulse brew cycle and 5 being the longest. 1 bar is equivalent of adding 11.6 seconds
to brew time.
Enter Service #
Program service phone number to be displayed anytime there is a fault message.
Enter Password
User must enter a 3 digit password to access remainder of adjustments. If no number
has been pre-programmed (000), then access is allowed.
Set Password (001-999)
Program any 3 digit number as a password.
Set Language
Chose between English or French.
Units
Chose between English (Oz, ºF) or Metric (Ml, ºC).
Set Temp
Adjust tank temperature 185º F to 205º F (85º C to 96º C).
Set Ready
Sets the minimum temperature allowable to start a brew cycle. If BREW LOCKOUT is en
abled. Range: (2º F to 20º F) or (2º C to 10º C) below the set temperature.
Hot H2O Lockout
Prevents a hot water dispense if water is not up to the H2O Ready temperature, if
enabled. Setting to “YES” will only allow dispensing of hot water at or above the “H20
READY” temp screen.
Hot H2O Ready
Sets the minimum temperature allowable to start dispensing hot water.
ENTER SERVICE #?
NO YES
ENTER PASSWORD
00
0
SET PASSWORD
00
0
SET LANGUAGE ?
NO YES
UNITS
METRI
CE
NGDONE
SET TEMP: 200
O
(-) (+)DONE
SET READY: 195
O
(-) (+)DONE
HOT H2O LOCKOUT ?
NO YESDONE
H2O READY: 195
O
(-) (+)DONE
BREW LOCKOUT ?
NO YESDONE
Constant Change
Is Not Possible
!!!Caution!!!
Memory is Locked
Brew Meter (A/B) (1-5)
(-) (+)
Brew Oz (A/B) (1-16)
(-) DONE (+)

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Enter Asset #
This function allows you to enter an optional asset number. This can be useful for tracking the
usage or service of an individual machine within a group.
Set Pulse Brew (A/B)
Individually adjust on/off times. This will override BREW METER.
Air Time (A/B)
Time the air pump runs after the brew pump shuts off. This air extracts any excess water
remaining in the pod.
Range: 1-60, Default: 15
Brews To Empty
Sets number of used pods needed in bin to display “Empty Bin” message.
Range: Disable/15-25
Enable Energy Saver
Choose to have the tank heaters turn off, or reduce the tank temp to 140ºF, (60ºC) once the “Set
Idle Time” has expired.
Range: .5 hours - 50.0 hours
Brew Count, Next
Life counter with no resettable brew count.
Brew Counts
Retains the total number of brew cycles completed. There is one counter and one life
counter that cannot be reset.
Calibrate Flow
Allows you to test the dispense ow rate out of the sprayhead for one minute and prompts an
ounce adjustment menu for entry of ounces delivered during test. New ounces entered in menu
will calculate the number of ow counts needed to deliver 10 ounces.
Flow Counts/10 oz.
Informational and adjustable menu displaying the calibrated ow count number in relation to a 10
ounce dispense.
Number of Ejects
Option of setting how many times the brewer tries to eject coffee pod after a brew cycle.
Brews On This Seal
Informational and resetable menu to be used as a guide to tell the user or technician when a
preventive maintenance needs to be performed.
Service Tools
Allows testing of load components and switches. It should be used only by a trained technician.
Factory Defaults
Resets all brew settings and calibrations back to factory presets.
AutoPOD Brewer
Single Tank V.09
Informational menu displaying software version number.
ENTER ASSET # ?
NO YES
SetPulseBrew A/B
NO YES
DONE
AIR TIME A/B: 15.0
(-) (+)
DONE
BREWS TO EMPTY
(-) (+)
25
EnablEnergySavr
NO YES
DONE
BREW COUNT ##
RESET NEXT
CALIBRATE FLOW ?
NO YES
NUMBER OF EJECTS
SINGLE DOUBLE
SERVICE TOOLS ?
NO YES
FACTORY DEFAULTS
NO YES
Brews On This Seal
Reset ## Next
AutoPOD Brewer
Single Tank V.09
BREW COUNT
NEXT
FLOW COUNTS/10 OZ.
225

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10
Calibrate Brew Inlet Flow
After initial start-up, a ow rate calibration may need to be performed.
Note: Follow the 8 steps below twice to complete a calibration process.
Step 1: Enter the program mode and scroll to the CALIBRATE FLOW menu and select YES.
Step 2: Menu screens will scroll to the following messages:
Press large or small button to begin the two stop calibration process.
Step 3: The machine will display a series of informational menus along with the FLOW COUNT number counting
down during dispense routine. When the ow count number reaches zero, dispense will stop.
Step 4: The machine will prompt a message to the user or technician “HEATING”. The tank must be at set
temperature before you can start the second part of the calibration process.
Step 5: Once set temperature has been achieved, the machine will display messages to prompt the user to do the
following:
Step 6: The machine will repeat step 3, the ow countdown dispense routine. Measure the captured hot water in
ounces.
Step 7: The machine will display the following menu after the second dispense routine. Use the (-) or (+) buttons
on the switch pad to enter the amount of ounces captured in your graduated measuring container.
Press “DONE” when nished.
Step 8: The ounces entered in Step 7 will calibrate a new ow count number in relation to a 10 ounce dispense. The
ow count number changes and will be set as the new calibration ow number.
Note: Reloading FACTORY DEFAULTS will erase the calibrated ow number and go back to the factory default
number for 10 ounces.
Drawer Must Be
In Brew Position
Go To Brew Position
No YES
Please Wait
Door Opening
!!!Caution!!!
Container Must
Hold 10 Ounces
Please Wait
Door Closing
Press
Brew To Start
Press
Brew To Start Empty Container
Enter OZ: 10.0
(-) DONE (+)

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Coffee Brewing Process
Step 1: The home screen will display a total of three messages.
Step 2: Place cup under the brew chamber and onto the booster tray or drip tray.
Step 3: Press the Open/Close switch to open the pod door and press a coffee pod rmly down into the pod holder.
menu screens will guide you through the process. The pod holder will accommodate a variety of pods
and different sizes from 50 to 61mm (1.97” - 2.40”) diameter.
Step 4: Press the Open/Close switch to close the pod door. The following menu screens will prompt you to close the
pod door and select a brew size.
Step 5: After selecting large or small brew, the menu screens will scroll brewing messages during the brew process
and inform you when brewing is complete. The system will automatically dispense the pod into the pod
bin, reset back to standby position and be ready for next brew command.
AutoPod Brewer Place Cup
To Begin
Press Open
To Load PodReady To Brew
PLEASE WAIT
DOOR CLOSING
SELECT BREW
PRESS CLOSE
BOOSTER
POD INSERTED
Brewing
Brewing
Complete
Please Wait
Flow Counts XXX
Please Wait
Pre Infusion
Flow Counts XXX
Enjoy
Your Beverage

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 the housing and panels.
The learner will disconnect the electrical and water supply.
The learner will remove the housing and panels.
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 and identify the
components that correspond to each triac.
The learner will be able to identify the components and functions of the ll system.
The learner will be able to identify the components and functions of the hot water dispense
system.
The learner will be able to identify the components and functions of the brew dispense
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 ejector assembly.

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Machine Composition
Exterior Overview
Product Outlets and Removable Parts
• Pod Door
• Drip Tray and Grate
• Booster Tray and Grate
• Pod Bin
• Top Cover
• Rear Panel
• Main Housing
• Switch Decal
Accessing the Inside of the Brewer
The majority of service work done to the My Caf é AP brewer will require the service technician to access the inside of
the unit. The brewer has three removable panels to facilitate access- the main housing, top cover and rear panel.
Depending on the type of repair, the technician may have to remove one or more of these panels.
In order to work safely the power should be disconnected prior to removal of any body panel. Once the panels are
removed the power can be reconnected in order to troubleshoot the machine.
Removing the Top Cover, Rear Panel and Housing
Step 1: Disconnect unit from power.
Step 2: Use a standard screwdriver and remove the two screws from the top cover of the unit. Lift the top cover up
and away from the unit.
Step 3: Move to the rear of the unit and remove the six standard screws securing the back panel. Pull the panel back
and away from the unit.
Step 4: Return to the front of the unit and pull the drip tray and pod bin out and set aside.
Step 5: Remove the black plastic door bezel by lifting upward and set aside.
Step 6: Locate and remove the three standard screws found on the bottom edge of the unit below the user interface.
Step 7: Turn the unit so that the right side is facing you. Tilt the unit upward to access the underside and remove the
right side standard screw.
Step 8: Turn the unit so that the left side is facing you. Tilt the unit upward to access the underside and remove the
left side standard screw.
Step 9: Remove the black plastic door bezel by lifting upward and set aside.
Step 10: Disconnect the harness with the 4 pin connector going to the display board.
Step 11: Turn the unit so that the front is facing you and then slide the main outer housing out away from the unit
frame.

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14
Machine Function and Operations
Main Control Board
The main control is the brain of the brewer. 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 switch/display board and activates/controls the brew
process, pod eject process and hot water dispense.
J1 Bin Reed Switch and H2O Rell Probe
J2 Brew Tank Thermistor
J3 Heater Relay Coil and Air Vent Coil
J4 Index Sensor and Pressure Switch
J5 xxxxx
J6 Switch/Display Board
J7 Flow Meter
J8 Index Motor & Air Pump Brew Tank
J9 BR- Brew Inlet Valve Coil
HW – Hot Water Valve Coil
BST Pmp – Brew pump
J11 Not Used
J12 Air Pump Hot Water Tank (H2O)
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:
(A) - Fill Probe
(B) - Tank
(C) - 120VAC inlet valve with outlet ow restrictor
Water enters the rear of the brewer from the supply line and rst goes
through a plastic strainer mounted in the inlet valve assembly. The CBA
will activate the ll valve and allow water ow past the valve plunger
through a .8 liter ow restrictor located in the outlet of the ll valve.
The regulated water then ows through a ow meter and through the
ll tube located on top of the tank. The ll tube outlet is located ap-
proximately 5 to 6 inches under the water surface, introducing the cold
water to the bottom of the tank. The control board monitors the level of
water in the tank through a low voltage level probe mounted in the top
of the tank. When water touches the ll probe, the circuit looses its low
voltage potential to ground and the CBA will turn the output off to the
inlet valve.
SW1
PRGM
LOCK
SET
ON
J3 J1
J11
J4
J7
J12
J8
J2
J6
4 3
2 1
J5
1
2
3
4
5
1
2
3
1 2 3 4 6 5 4 3 2 1 2 1
2 1
1
2
1
3
2
4
BR
SOL
HW
SOL
BST
PMP
A
B
C

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Dispense Systems
The My Café AP brewer has two dispense systems, one for hot water
dispense and brew dispense.
Hot Water Dispense
The hot water dispense system consists of:
(A) - 68 Ounce Hot Water Tank with Element
(B) - Fill Inlet Valve and check valve-not shown
(C) - Hot Water Air Pump
(D) - Vent Valve
(E) - Silicone Outlet Hot Water Tube
(F) - Rell Probe
The hot water tank is maintained by a rell circuit. The hot water but-
ton on the front is used as a push and hold function for hot water de-
livery with a maximum of 13 second hold time before shutting off the
dispense. The approximate amount of ounces delivered in a single
dispense is 10 ounces. The delivery of hot water is accomplished by
pressuring the hot water tank to push hot water through the stainless
tube that is positioned far under the water surface.
The hot water dispense path starts with water entering the inlet valve
and is regulated by an orice located in the outlet of the ll valve.
The regulated water passes through a ow meter and travels to the
top of the tank and connects to a ll tube that is held in place with a grommet. The ll tube is approximately 6 inches
in length going into the tank. The tank will ll with water to the rell probe level and will heat to the set temperature.
When a user presses the momentary hot water button, the vent valve will close and the air pump will turn on for a
period of time to pressurize the tank to start the hot water dispense. The hot water exits out of a separate nozzle
located on the stream guide housing and into the receiving cup.
Note: Unlike the air check valve, the water check valve doesn’t have an internal return spring.
Brew Dispense
The brew tank dispense system consists of:
(A) - Fill Inlet Valve and check valve-not shown
(B) - Flow Meter
(C) - 68 Ounce Water Tank
(D) - 120VDC Brew Pump
(E) - Coffee Air Pump
(F) - Sprayhead assembly
E1 - Stream Guide
E2 - Pod Holder
E3 - Sprayhead
E4 - Sprayhead Seal
E5 - Air Check Valve (Left)
Water Check Valve (Right)
E6 - Sprayhead Top
A
B
C
D
E
E1
E2
E3 E4
E5 E6
A
B
C
D
E
F
E

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16
The tank is initially lled upon startup and is monitored by a rell or level probe. When commanded by the large or
small brew button, the CBA will activate the ll solenoid allowing the regulated water to enter the inlet of the ow
meter and exit out the ow meter going to the ll tube located on top of the tank. The paddle within the ow meter
created an input signal to the CBA, the CBA generates a logical number on the display during a brew dispense called
Flow Counts. The ow count is the calibrated volume of brew water entering the tank, rising past the level probe.
The brewer will display a series of informational screens during the brew process while the brew pump is activated
to draw the calibrated water from the tank through the check valve, sprayhead, coffee pod, pod holder, stream guide
and into the receiving cup. The brew pump will deactivate when the water drops below the level probe and the cofffee
air pump will turn on creating a minimal amount of pressure above the coffee pod to push out any remaining coffee,
reducing drip out time.
The brewer will begin heating the water back to set temperature. Once temperature is achieved and the heater turns
off, the rell circuit will activate and ll the tank with water until it reaches the level probe.
Heating Circuit
The heat circuit consists of:
(A) - Temperature Sensor
(B) - Limit Thermostat
(C) - Tank
(D) - Tank Heater 1425 watt, 120vac
(E) - Control Board with Hybrid Heating
Components
(F) - Vent Valve
The vent valve is located above the water tank and is
normally open to allow venting during heating. The heat-
ing element is protected when the brewer is powered on
to prevent dry ring of the tank element, which occurs
when there is no water in the tank. The ll probe must be
satised with water before the CBA activated the heating
element. Once the ll probe is satised, the CBA moni-
tors the tank thermistor/temp sensor (resistance/voltage)
and will activate the heater triac (TH1) and pass power
through the limit thermostat and to the heating element.
The limit thermostat is used as a precautionary device in the event of a tank over heating. The limit is rated to open
at a temperature of 230º F. and will reset around 170º F.
Hybrid Heating Circuit
A relay and a triac are connected in parallel so either can switch power to the tank heater. The relay
carries the current when the water temperature is more than two degrees lower than the target range.
The triac is used under two conditions:
1. Every time the relay contacts open or close, the triac switches on for a fraction of a second
before the open or close and stays on for a fraction of a second after the open or close. This
prevents the relay contacts from carrying any surge current on closure and prevents any arcing
of contacts on opening. This greatly increases relay contact life.
2. When the water temperature is within two degrees of target, the relay contacts open and the
triac pulsed at a low duty cycle to reach and maintain the target temperature with extreme
accuracy. The need for a keep-warm blanket is eliminated.
A
B
C
D
E
F

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A
BC
D
E
F
Ejector Assembly
Ejector assembly consists of:
(A) - Housing
(B) - Brew head assembly with check valves
(C) - Pod holder assembly with linkage
(D) - Pod screen assembly
(E) - Index motor with position disc
(F) - Index sensor

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18
The Ejector assembly is a critical component used to align the pod holder in different placement positions. The place-
ment positions are: load, brew, eject and set back positions. The index motor rotates the position disc and pod holder
forward and backward at different intervals. The position disc is slotted and rotates between the index sensor. The
index sensor monitors the slots and stops the index motor at the correct placement position for the pod holder during
the entire brew process from start to nish.
Pod Holder or Index Motor Position during Brew Cycle
Step 1: Depress the open/close button and pod holder rotates outward to coffee pod load position.
Step 2: Depress the open/close button and the pod holder rotates back in and stops in the brew position
(under sprayhead assembly).
Step 3: After brewing is complete, the pod holder rotates further back and down to coffee pod eject position.
Note: The coffee pod eject has an option of making a single or double attempt of ejecting the pod in the
programming menu.
Step 4: After ejecting the coffee pod, the pod holder rotates forward by a set time built in the software
(approx. 5 seconds) and stops at the set back position from the sprayhead assembly and is ready for the
next brew command.
Load Position - Sensor Unblocked
Brew or Home Position - Sensor Unblocked
Dump Position - Sensor Blocked

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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20
Preventive Maintenance
In order to maintain proper operation and long service life, BUNN®recommends performing the preventive maintenance
every 6 months. Individual customers will vary with some customers choosing not to receive preventive maintenance.
Some of the PM items may require more frequent maintenance depending on the site conditions.
Tools Required:
• 2 standard screwdrivers (1 small tip & 1 medium tip)
• Needle nose pliers
• Pliers
• 2, 8 inch crescent wrench
• Graduated measuring container
• Tube Brush (.25 0D), BUNN P/N: 26367.0000
• Hook Pick
PM Parts:
• Water lter or cartridge
• Sprayhead seal, BUNN PN: 42310.0000 - rated 25,000 brews
Optional Advanced PM Parts Upon Inspection:
Advanced service parts may be needed during suggested inspection of related areas during a PM process.
• Dezcal™, Activated Scale Remover, BUNN PN: 37306.0000 (individual pack)
• Check valve kit (air), BUNN PN: 36379.1001, Color: White
• Check valve kit (brew), BUNN PN: 36379.1002, Color: Black
Prior to servicing the brewer:
• Use service tools to move pod drawer back to dump position.
• Disconnect the water and electrical supply.
• Assess placement of brewer to perform PM process.
• Allow brewer tank time to cool down.
• Remove top cover and rear panel.
6 Month PM Steps
Step 1: If customer has a BUNN® water ltration system installed before the brewer, replace the lter or lter cartridge
and purge before installing to the brewer. Write next change date on lter decal.
Step 2: Clean sprayhead.
□Enter “Service Tools” and move pod drawer to dump position to give adequate space for sprayhead removal.
□Check the number of brews on the sprayhead seal by entering programming and scrolling to “Brews On This
Seal” menu. The seal is recommended to be replaced at 25,000 brews if achieved before a 6 month period.
□Disconnect brewer from power source and allow to cool.
□Remove two screws and top cover.
□Slip one hand through pod door opening. With your other hand, turn the thumbscrew counterclockwise. (Fig. 1-1)
□Remove the sprayhead assembly through the front.
□Remove the seal from sprayhead.
□Check and clean the sprayhead. The sprayhead holes must always remain open.
□Clean all of the holes in the plastic sprayhead to remove any mineral deposits. Wash and rinse in the sink. (Fig. 1-2)
□When reassembling the sprayhead, be sure to have the seal installed with the ridge facing up. (Fig 1-3)
1-2
1-1
1-3