10420.0001
H5E, H5X
With Digital Control Board
OPERATING & SERVICE MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
To ensure you have the latest revision of the manual or to obtain the illustrated parts catalog, please visit
the Bunn-O-Matic website, at www.bunn.com. This is absolutely FREE, and the quickest way to obtain
the latest catalog and manual updates. Contact Bunn-O-Matic Corporation at 1-800-286-6070 to obtain
a paper copy of the required Illustrated Parts Catalog mailed via U.S. Postal Service.
10420.0001A
04/09 © 2009 BUNN-O-MATIC CORPORATION
BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY
Bunn-O-Matic Corp. (“BUNN”) warrants equipment manufactured by it as follows:
1) All equipment other than as specified below: 2 years parts and 1 year labor.
2) Electronic circuit and/or control boards: parts and labor for 3 years.
3) Compressors on refrigeration equipment: 5 years parts and 1 year labor.
4) Grinding burrs on coffee grinding equipment to grind coffee to meet original factory screen sieve analysis:
parts and labor for 3 years or 30,000 pounds of coffee, whichever comes first.
These warranty periods run from the date of installation BUNN warrants that the equipment manufactured by
it will be commercially free of defects in material and workmanship existing at the time of manufacture and
appearing within the applicable warranty period. This warranty does not apply to any equipment, component or
part that was not manufactured by BUNN or that, in BUNN’s judgment, has been affected by misuse, neglect,
alteration, improper installation or operation, improper maintenance or repair, damage or casualty. This warranty is
conditioned on the Buyer 1) giving BUNN prompt notice of any claim to be made under this warranty by telephone
at (217) 529-6601 or by writing to Post Office Box 3227, Springfield, Illinois 62708-3227; 2) if requested by
BUNN, shipping the defective equipment prepaid to an authorized BUNN service location; and 3) receiving prior
authorization from BUNN that the defective equipment is under warranty.
THE FOREGOING WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ANY OTHER WARRANTY, WRITTEN OR
ORAL, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF EITHER
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. The agents, dealers or employees of BUNN
are not authorized to make modifications to this warranty or to make additional warranties that are binding on
BUNN. Accordingly, statements by such individuals, whether oral or written, do not constitute warranties and
should not be relied upon.
If BUNN determines in its sole discretion that the equipment does not conform to the warranty, BUNN, at its
exclusive option while the equipment is under warranty, shall either 1) provide at no charge replacement parts
and/or labor (during the applicable parts and labor warranty periods specified above) to repair the defective
components, provided that this repair is done by a BUNN Authorized Service Representative; or 2) shall replace
the equipment or refund the purchase price for the equipment.
THE BUYER’S REMEDY AGAINST BUNN FOR THE BREACH OF ANY OBLIGATION ARISING OUT OF THE SALE OF
THIS EQUIPMENT, WHETHER DERIVED FROM WARRANTY OR OTHERWISE, SHALL BE LIMITED, AT BUNN’S
SOLE OPTION AS SPECIFIED HEREIN, TO REPAIR, REPLACEMENT OR REFUND.
In no event shall BUNN be liable for any other damage or loss, including, but not limited to, lost profits, lost sales,
loss of use of equipment, claims of Buyer’s customers, cost of capital, cost of down time, cost of substitute
equipment, facilities or services, or any other special, incidental or consequential damages.
BrewWISE, BrewLOGIC, BrewMETER, BrewWIZARD, Bunn Gourmet, BUNN Gourmet Ice, BUNN Pour-O-Matic, BUNN,
Bunn-OMatic, Bunn-O-Matic, BUNNlink, BUNNserve, BUNNSERVE, BUNN Espress, Cool Froth, DBC, Dr. Brew, Dual, EasyClear, EasyGard, Easy Pour, FlavorGard, Gourmet Ice, Gourmet Juice, High Intensity, IMIX, Infusion Series, Intellisteam,
Quality Beverage Equipment Worldwide, The Mark of Quality in Beverage Equipment Worldwide, My Café, PowerLogic,
Safety-Fresh, Scale-Pro, Silver Series, Single, Smart Funnel, Smart Hopper, SmartWAVE, Soft Heat, SplashGard, System
III, ThermoFresh, 392, AutoPOD, AXIOM, Beverage Profit Calculator, Beverage Bar Creator, BUNNsource, Coffee At Its
Best, Digital Brewer Control, Nothing Brews Like a BUNN, Pouring Profits, Pulse Wave, Signature Series, Smart Heat,
Tea At Its Best, The Horizontal Red Line, Titan, Ultra, are either trademarks or registered trademarks of Bunn-O-Matic
Corporation.
2
10420.1 012609
CONTENTS
Warranty........................................................2
Introduction...................................................3
User Notices..................................................3
Electrical Requirements.................................4
Plumbing Requirements................................5
Initial Set-Up..................................................5
Programming.................................................6
Draining the Dispenser...................................8
Cleaning.........................................................8
Troubleshooting.............................................9
Service.........................................................12
Wiring Schematics.......................................21
INTRODUCTION
This equipment heats and dispenses water on demand for beverages and cooking purposes. It has a panel
above the faucet that indicates the status of the dispenser. This equipment is for indoor use, either wall-mounted
or on a sturdy counter or shelf.
USER NOTICES
The notices on this dispenser should be kept in good condition. Replace unreadable or damaged labels.
! WARNING
! WARNING
Hot Water
Use With Care
Fill water tank before turning - on thermostat or connecting appliance
to power source.
Use only on a properly protected
circuit capable of the rated load.
Electrically ground the chassis.
Follow national/local electrical codes.
Do not use near combustibles.
FAILURE TO COMPLY RISKS EQUIPMENT
DAMAGE, FIRE, OR SHOCK HAZARD
12593.0000
READ THE ENTIRE OPERATING MANUAL
BEFORE BUYING OR USING THIS PRODUCT
00824.0000
00824.0000
THIS APPLIANCE IS HEATED WHENEVER
CONNECTED TO A POWER SOURCE
00824.0001
00831.0000F 3/98 ©1998 BUNN-O-MATIC CORPORATION
00831.0000
This equipment must be installed to comply
with the International Plumbing Code of the
International Code Council and the Food
Code Manual of the Food and Drug Administration (FDA). For models installed outside
the U.S.A., comply with the applicable
Plumbing /Sanitation Code.
00656.0000
37881.0000
3
10420.1 040309
ELECTRICAL REQUIREMENTS
WARNING - The dispenser must be disconnected from the power source until specified in Initial Set-Up.
Refer to Data Plate on the Brewer, and local/national electrical codes to determine circuit requirements.
WHITE
NEUTRAL
L1 BLACK
GREEN
WHITE
NEUTRAL
L1 BLACK
GREEN
N
L1
G
L2 RED
L2 RED
L1 BLACK
L1 BLACK
GREEN
GREEN
L2
L1
G
L2 RED
L1 BLACK
GREEN
L2 BLUE
RED
L2
N
BROWN
L1 BLACK
L1
GRN/YEL
GREEN
G
120 volt ac models
208 & 240 volt ac models
230 volt ac models
Note: This electrical service consists of 2 current carrying conductors (L1 and Neutral) and a separate conductor for earth ground.
Note: This electrical service consists of 2 current carrying conductors (L1 and L2) and a separate
conductor for earth ground.
Note: This electrical service consists of 2 current carrying conductors (L1 and Neutral) and a separate conductor for earth ground.
Electrical Hook-Up
CAUTION – Improper electrical installation will damage electronic components.
1.An electrician must provide electrical service as specified.
2.Using a voltmeter, check the voltage and color coding of each conductor at the electrical source.
3.Remove the upper and lower rear panels.
4.Install a strain relief and the proper electrical wiring to the terminal block.
5.Connect the dispenser to the power source and verify the voltage at the terminal block before proceeding.
Reinstall both rear panels.
6.If plumbing is to be hooked-up later be sure the dispenser is disconnected from the power source. If Plumbing
has been hooked-up, the dispenser is ready for Initial Set-Up.
CE REQUIREMENTS
• This appliance must be installed in locations where it can be overseen by trained personnel.
• For proper operation, this appliance must be installed where the temperature is between 5°C to 35°C.
• Appliance shall not be tilted more than 10° for safe operation.
• An electrician must provide electrical service as specified in conformance with all local and national codes.
• This appliance must not be cleaned by water jet.
• This appliance is not intended for use by persons (including children) with reduced physical, sensory or mental capabilities, or lack of experience and knowledge, unless they have been given instructions concerning use
of this appliance by a person responsible for its safety.
• Children should be supervised to ensure they do not play with the appliance.
• If the power cord is ever damaged, it must be replaced by the manufacturer or authorized service personnel with
a special cord available from the manufacturer or its authorized service personnel in order to avoid a hazard.
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10420.1 040309
PLUMBING REQUIREMENTS
This dispenser must be connected to a cold water system with operating pressure between 20 and 90 psi
(138 and 620 kPa)from a ⁄2” or larger supply line. A shut-off valve should be installed in the line before the dispenser. Install a regulator in the line when pressure is greater than 90 psi (620 kPa) to reduce it to 50 psi (345
kPa). The water inlet fitting is ⁄4” flare.
1
1
NOTE - Bunn-O-Matic recommends ⁄4” tubing for installations of less than 25 feet and ⁄8” for more than 25 feet
from the ⁄2” water supply line. At least 18 inches of an FDA approved flexible beverage tubing, such as reinforced
braided polyethylene or silicone, before the dispenser will facilitate movement to clean the countertop. BunnO-Matic does not recommend the use of a saddle valve to install the dispenser. The size and shape of the hole
made in the supply line by this type of device may restrict water flow.
1
3
1
This equipment must be installed to comply with the International Plumbing Code of the International
Code Council and the Food Code Manual of the Food and Drug Administration (FDA). For models installed
outside the U.S.A., you must comply with the applicable Plumbing/Sanitation Code for your area.
Plumbing Hook-Up
1. Flush the water line and securely attach it to the flare fitting on the
rear of the dispenser.
2. Turn-on the water supply.
INITIAL SET-UP
CAUTION - The dispenser must be disconnected from the power source
throughout the initial set-up, except when specified in the instructions.
1. Connect dispenser to the power source and turn on water supply.
2. Place master ON/OFF switch (if dispenser is equipped with a master
switch) in the ON position.
3. Water will automatically flow into the tank to the proper level and shut-off. When filled, the water heater will
turn on automatically. This will take approximately 7 minutes.
4. The tank will heat to the (set) temperature.
5. Refer to Programming to set the Tank Temperature and the Ready Temperature.
5
10420.1 040309
PROGRAMMING
When power is applied to the dispenser, the display located on the bottom of the main circuit board will show
the revision level of the software for 5 seconds, and then go to (-). While the tank is filling, the display will read
(FIL). When the tank is full the display will return to (-).
LEFT
BUTTON
CENTER
BUTTON
RIGHT
BUTTON
P3747
INITIAL PROGRAMMING OF THE CONTROL BOARD
1. Before programming any settings into the Control Board, confirm the correct machine selection is entered.
2. Do this by pressing and holding down on the center button until U1 appears on the display (approximately 9-10
seconds). Release the center button. Now, press and release the center button until the display reads U9. The
display will show either A, 6.25, 12.5, 25.0, or H10.
3. The display should be set to A. If it shows anything but A, press and release the right button until it shows A.
4. Press and release the center button once more. The display will show the Software Version, then (-).
You may now proceed with the Level 1 and Level 2 Programming.
LEVEL 1 PROGRAMMING
TANK WATER TEMPERATURE & READY TEMPERATURE SET-UP
1. Press and hold the center button until P1 appears on the display (approximately 3
seconds) then release button. The tank water temperature set point will appear on
the display. Factory default is 200° F for most dispensers, and 90° F for some.
2. Use the (+) button to increase the temperature set point, and the (-) button to decrease the set point.
NOTE: If the unit is a H5X, set the Tank Temperature to 212°F.
3. After the Tank Temperature is entered, press and release the center button once
more. The display will read P2, then show the ready temperature set point. Factory
default is 195° F for most dispensers, and 85° F for some.
4. Press the (+) button to increase the temperature set point, and the (-) button to
decrease the set point.
5. To exit Level 1 Program press and release the center button once more. The display
will show Software version, then (-).
6
10420.1 040309
PROGRAMMING (Continued)
LEVEL 2 PROGRAMMING
FAHRENHEIT OR CENTIGRADE SELECTION, & RESTORING FACTORY DEFAULTS
1. To enter Level 2 Programming, press and hold the center button until H2 appears
on the display (approximately 6 seconds). Release the center button, The display
will show either FAH (Degrees in Fahrenheit) or CEn (Degrees in Centigrade).
2. Press and release the (+) or (-) buttons to alternate between FAH and CEn.
3. After setting FAH or CEn, to exit Level 2 Programming, press and release the center
button twice. Software Version will show on the display, then (-).
RESTORING FACTORY DEFAULTS
1. To restore Factory Defaults (This clears all settings that were previously entered),
press and release the center button until H2 appears on the display (approximately
6 seconds). Release the Center Button, then press and release the Center Button
once more. The display will read H3, then show (- - -).
2. Press and hold both (+) and (-) buttons to initiate the resetting of the factory default settings. The display (- - -) will flash on and off during this time (about 5 to 7
seconds).
3. When the factory default numbers are loaded in, the display will stop flashing, then
read don (DONE). You can now release the two buttons.
NOTE: If you release the two buttons at any time before the display reads don, the Factory
Default numbers will not be entered. The old numbers will remain in the memory.
4. To exit Level 2 Programming press and release the center button once more. The display will show the Software Version, then (-).
7
10420.1 040309
DRAINING THE DISPENSER
CAUTION - The dispenser must be disconnected from the power source throughout these steps.
1.
2.
3.
4.
5.
Disconnect the dispenser from the power source.
Shut-off and disconnect the incoming water supply
Remove the 4-40 screws at the sides of the top panel.
Gently remove one of the grommets from the tank lid.
Insert a tube to the bottom of the tank and syphon ALL of the water out.
NOTE - The dispenser must be full using the INITIAL SET-UP steps before reconnecting to the power source.
CLEANING
The use of a damp cloth rinsed in any mild, non-abrasive, liquid detergent is recommended for cleaning all
surfaces on Bunn-O-Matic equipment.
WALL MOUNTED INSTALLATION
If the dispenser is wall mounted, the bottom of the dispenser should be at the same height as a counter or
table top. Use B.O.M. part #12542.0000 for side mounted Wall Bracket Kit or # 13125.0001 for front mounted
Wall Bracket Kit .
SUPPORT FOR LARGE RECEPTACLES
CAUTION: If the dispenser is to be used with larger receptacles such as pitchers or pots, those receptacles must
be adequately supported during dispensing of hot water to avoid spillage of very hot water. This support may be
provided by a table or counter top, or use B.O.M. part #12599.0000 Shelf Kit.
8
10420.1 040309
TROUBLESHOOTING
A troubleshooting guide is provided to suggest probable causes and remedies for the most likely problems
encountered. If the problem remains after exhausting the troubleshooting steps, contact the Bunn-O-Matic
Technical Service Department.
• Inspection, testing, and repair of electrical equipment should be performed only by qualified service personnel.
• All electronic components have 120 – 240 volt ac and low voltage dc potential on their terminals. Shorting
of terminals or the application of external voltages may result in board failure.
• Intermittent operation of electronic circuit boards is unlikely. Board failure will normally be permanent. If
an intermittent condition is encountered, the cause will likely be a switch contact or a loose connection at a
terminal or crimp.
• Solenoid removal requires interrupting the water supply to the valve. Damage may result if solenoids are
energized for more than ten minutes without a supply of water.
• The use of two wrenches is recommended whenever plumbing fittings are tightened or loosened. This will
help to avoid twists and kinks in the tubing.
• Make certain that all plumbing connections are sealed and electrical connections tight and isolated.
• This dispenser is heated at all times. Keep away from combustibles.
WARNING
• Exercise extreme caution when servicing electrical equipment.
• Disconnect dispenser from the power source when servicing, except when electrical tests are specified.
• Follow recommended service procedures
• Replace all protective shields or safety notices
FAULT CODES
When a fault occurs (failure to the unit) the POWER lamp will flash to identify the problem.
Flashes
1
2
3
4
5
6
Description of Failure
Temperature Sensor (short)
Temperature Sensor (open)
Refill Fault (continuous refill for 15 minutes)
Heater Fault (heater relay on for 120 minutes)
Boil Thermistor (short) H5X only
Boil Thermistor (open) H5X only
Problem
Probable Cause
Remedy
Equipment will not operate.
1. No power or incorrect voltage
(A) Check the terminal block for the correct voltage. It should be:
a.) 100 to 120 volts ac across the black
and white terminals for 100 to 120 volt
models or,
b.) 200 to 240 volts ac across the red and
black terminals for 200 to 240 volt models
or,
c.) 230 volts ac across the red and black
terminals for 230 volt models.
9
(B) Check circuit breakers or fuses.
10420.1 040309
TROUBLESHOOTING (cont.)
Problem
Probable Cause
Remedy
Equipment will not operate
(cont.)
2. Safety overflow switch
Refer to Service – safety overflow switch
for testing procedures. See page 18.
Automatic refill will not operate after drawing hot water.
1. No water
Check plumbing and shut-off valves.
2. Water strainer/flow control
(A) Direction of flow arrow must be pointing towards dispenser.
(B) Remove the strainer/flow control and
check for obstructions. Clear or replace.
3. Safety overflow switch
Refer to Service – safety overflow switch
for testing procedures. See page 18.
4. Liquid level system
Refer to Service – electronic controls for
testing procedures. See page 12.
5. Solenoid valve
Refer to Service – solenoid valve for testing procedures. See page 19.
Water flows into the tank con- 1. Solenoid valve
tinuously (Dispenser disconnected from power source).
Refer to Service – solenoid valve for testing procedures. See page 19.
Water flows into the tank con- 1. Liquid level system
tinuously (Dispenser connected to power source).
Refer to Service – electronic controls for
testing procedures. See page 10.
Water is cold.
1. Safety overflow switch
Refer to Service – safety overflow switch
for testing procedures. See page 18.
2. Limit thermostat
Refer to Service – limit thermostat for
testing procedures. See page 17.
CAUTION – Do not eliminate or bypass limit thermostat. Use only B.O.M. replacement part #23717.0003.
3. Tank heater
Refer to Service – tank heater for testing
procedures. See page 20.
4. Temperature control
Refer to Service – electronic controls for
testing procedures. See page 10.
10
10420.1 040309
TROUBLESHOOTING (cont.)
Problem
Probable Cause
Remedy
Water boils continuously.
1. Temperature control
Refer to Service – electronic controls for
testing procedures. See page 10.
2. Lime build-up
Inspect the tank assembliy for excess lime
deposits. Delime as required.
CAUTION – Tanks and tank components should be delimed reglarly depending on local water conditions. Excessive mineral build-up on stainless steel surfaces can initiate corrosive reactions resulting in serious leaks.
Dispenser is making unusual 1. Plumbing lines
noises.
Plumbing lines should not be resting on
the counter top.
(A) The dispenser must be connected to a
cold water line.
3. Water supply
(B) Water pressure to the dispenser must
not be higher than 90 psi (620 kPa). Install
a regulator if necessary to lower the working pressure to approximately 50 psi (345
kPa).
Ready indicator will not light.
1. Temperature control
Refer to Service – electronic controls for
testing procedures. See page 10.
2. Ready Indicator LED
Replace the indicator LED.
11
10420.1 040309
SERVICE
This section provides procedures for testing and
replacing various major components used in this
dispenser should service become necessary. Refer
to Troubleshooting for assistance in determining the
cause of any problem.
Component Access
WARNING – Disconnect the dispenser from the power
source before the removal of any panel or the replacement of any component.
P1770
The limit thermostat, liquid level probe, tank heater,
and temperature sensor are located at the top of the
dispenser. Access is gained by removing the top lid,
attached with three 4-40 slotted-head screws.
NOTE - Completely drain the tank before tipping the
dispenser.
WARNING – Inspection, testing, and repair of electrical
equipment should be performed only by qualified service
personnel. Disconnect the dispenser from the power
source when servicing, except when electrical tests are
required and the test procedure specifically states to
connect the dispenser to the power source.
P1770
The check valve, electronic control board, safety
overflow switch, solenoid valve, overflow tube temperature sensor and terminal block are located at the rear of
the dispenser. Access is gained by removing the upper
and lower rear panels. The upper is attached with six
8-32 slotted-head screws. The lower is attached with
four 8-32 slotted-head screws. The middle panel must
not be removed from the dispenser.
Electronic Controls................................................10
Limit Thermostat...................................................17
Safety Overflow Switch.........................................18
Solenoid Valve......................................................19
Tank Heater...........................................................20
Electronic Control Board Troubleshooting:
Check these items first
• Is circuit board popped-out of bracket?
• Is circuit board wet due to misaligned overflow
tube?
• Is water in overflow cup activating float switch?
• Is overflow cup not making good contact with
tank?
• Is dispenser being operated with panels removed?
P1770
12
10420.1 040309
SERVICE (cont.)
Electronic Controls
H5E, H5X LIQUID LEVEL CONTROL
PROBLEM: Overflows
Drain cup
Unplug Ready Lamp
Retry
Overflow
?
No
Replace Ready Lamp
Yes
Drain cup
FIG. 1 ELECTRONIC CONTROL
Disconnect Probe
Wire From Probe
Short Probe Wire
To Chassis
P1772
Retry
Location:
The electronic control board is located inside the
rear of the dispenser. Access will also be needed to the
temperature sensor, overflow tube temperature sensor,
and liquid level probe located on the tank lid.
Overflow
?
No
Replace Probe
Yes
Drain cup
Disconnect Wire From
Solenoid Valve
Retry
General:
This system controls the liquid level and water
temperature of the dispenser. These two functions
act independently of each other and should be tested
separately.
Overflow
?
Yes
Replace Solenoid Valve
No
Replace Control Board
Liquid Level Control Flow Charts
H5E, H5X LIQUID LEVEL CONTROL
PROBLEM: Does Not Refill
Overflow Cup Full
?
Yes
Remove Power
Drain cup
No
Retry
Disconnect Level Probe
Voltage present at
Solenoid Valve
?
Yes
No
Yes
Replace Probe
No
Unplug Ready Lamp
Voltage present at
Solenoid Valve
?
Does Water Flow
?
Replace Solenoid Valve
Yes
Replace Ready Lamp
No
Replace Control Board
13
10420.1 040309
SERVICE (cont.)
Electronic Controls (cont.)
4. Remove the pink wire from terminal 5 of the electronic control assembly.
5. Check the voltage across terminals 1 & 4 of the
electronic control board with a voltmeter. Connect
the dispenser to the power source. The indication
must be:
a.) 100 to 120 volts ac for 100 to 120 voltmodels
or
b.) 200 to 240 volts ac for 200 to 240 volt models
or
c.) 230 volts ac for 230 volt models
after a delay of approximately 5 seconds.
6. Disconnect the dispenser from the power source.
Liquid Level Control Test Procedure
1. Disconnect the dispenser from the power source.
2. Check the voltage across terminals 3 & 4 of the
electronic control board with a voltmeter. Connect
the dispenser to the power source. The indication
must be:
a.) 100 to 120 volts ac for 100 to 120 volt models
or
b.) 200 to 240 volts ac for 200 to 240 volt models
or
c.) 230 volts ac for 230 volt models.
3. Disconnect the dispenser from the power source. If
voltage was present as described, proceed to #4. If
voltage was not present as described, refer to the
Wiring Diagrams and check the dispenser wiring
harness.
If voltage was present as described, the liquid level
control of the system is operating properly, proceed
to #7.
If voltage was not present as described, replace the
electronic control board and the temperature sensor
in the tank lid.
Temperature Control Flow Charts
14
10420.1 040309
SERVICE (cont.)
If voltage was present as described, reinstall the
probe, the sensing function of the system is operating
properly.
If voltage was not present as described, check the pink
probe wire and the green ground wire for continuity
and/or replace the probe.
Electronic Controls (cont.)
7. Reconnect the pink wire to terminal 5 of the electronic control assembly.
8. Loosen the compression fitting, remove the probe
from the tank lid, and inspect it for mineral deposits. Replace it if necessary. Keep the exposed ends
of the probe away from any metal surface of the
dispenser.
9. Check the voltage across terminals 1 & 4 of the electronic control assembly with a voltmeter. Connect
the dispenser to the power source. The indication
must be:
a.) 100 to 120 volts ac for 100 to 120 volt models
or
b.) 200 to 240 volts ac for 200 to 240 volt models
or
c.) 230 volts ac for 230 volt models after a delay
of approximately 5 seconds.
10.Touch the screw head end of the probe to the dispenser housing. The indication must be 0.
11.Move the probe away from the dispenser housing.
The indication must again be:
a.) 100 to 120 volts ac for 100 to 120 volt models
or
b.) 200 to 240 volts ac for 200 to 240 volt models
or
c.) 230 volts ac for 230 volt models
after a delay of approximately 5 seconds.
12.Disconnect the dispenser from the power source.
Temperature Control Test Procedure
1. Disconnect the dispenser from the power source.
2. Check the voltage across terminals 3 & 4 of the
electronic control circuit board with a voltmeter.
Connect the dispenser to the power source.The
indication must be:
a.) 100 to 120 volts ac for 100 to 120 volt models
or
b.) 200 to 240 volts ac for 200 to 240 volt models
or
c.) 230 volts ac for 230 volt models.
3. Disconnect the dispenser from the power source.
4. Check the voltage across the tank heater terminals
with a voltmeter. Connect the dispenser to the
power source. The indication must be:
a.) 100 to 120 volts ac for 100 to 120 volt models
or
b.) 200 to 240 volts ac for 200 to 240 volt models
or
c.) 230 volts ac for 230 volt models.
5. Disconnect the dispenser from the power source.
Temperature Control Flow Charts (cont.)
H5X THERMOSTAT
H5E THERMOSTAT
PROBLEM: Boils Excessively - Fills Cup
PROBLEM: Boils
Drain cup
Drain cup
Retry
Retry
Red Light On While
Boiling
?
Yes
Red Light On While
Boiling
?
Replace Steam Sensor
Yes
Replace Control Assembly
No
No
Disconnect Blue Wire From
Control Board Pin 7
Still Boiling
?
Retry
Yes
Disconnect Blue Wire From
Control Board Pin 7
Replace Control Assembly
Retry
No
Finished
Still Boiling
?
No
Yes
Still Boiling
?
Replace Triac Assembly
Check For Split
Tank Heater
No
Yes
Replace Triac Assembly
Check For Split
Tank Heater
Replace Control Board
Replace Control Board
15
10420.1 040309
SERVICE (cont.)
Electronic Controls (cont.)
If voltage was present as described, the temperature
control of the system is operating properly.
If voltage was not present as described, contact BunnO-Matic to order an electronic control board and temperature sensor for evaluation and proceed to #9.
6. Replace the electronic control board.
T5 PNK to Liquid
Level Probe
7. Check the voltage across the tank heater terminals
with a voltmeter. Connect the dispenser to the
power source. The indication must be:
a.) 100 to 120 volts ac for 100 to 120 volt models
or
b.) 200 to 240 volts ac for 200 to 240 volt models
or
c.) 230 volts ac for 230 volt models
T4 WHI or RED to
Terminal Block
BLU to Tank
Heater
T3 BLK to Overflow
Safety Switch
T2 GRN or GRN/YEL
to Chassis Ground
WHI/VIO to
Terminal Block
T1 WHI/BLU to
Solenoid
J5 GRY & GRY toThermistor (H5X only)
J4 BLK & WHI to
Temperature Sensor
8. Disconnect the dispenser from the power source.
J3 PNK & GRY to
Heater Indicator
Refill Indicator
Power Indicator
Ready Indicator
If voltage was present as described, the temperature
control of the system is operating properly. Return the
new electronic control board or temperature sensor to
Bunn-O-Matic for credit.
Electronic Controls Removal and Replacement
FIG. 2 WIRING CONNECTIONS
1. Remove all wires from the electronic control board
terminals.
2. Remove the six 6-32 screws holding the electronic
control board to the component bracket.
3. Disconnect the temperature sensor, overflow tube
temperature sensor, and indicator wires from the
electronic control board.
4. Attach the temperature sensor, overflow tube
temperature sensor, and indicator wires to the
electronic control assembly.
5. Fasten the new electronic control board to its
bracket.
6. Refer to Fig 2 when reconnecting the wires.
7. Review the initial set-up procedures on page 6.
Adjustments
The H5X dispenser holds the water temperature
at the threshold of boiling. It is not adjustable by the
user.
The H5E dispenser is factory calibrated for the
temperature specified on the data plate. If adjustment
is required, use the following procedure:
1. Fill the dispenser according to the steps in the Initial
Set-up.
2. Take the temperature of the stream of water immediately below the faucet as it flows from the
dispenser with an accurate thermometer. Do not
take the temperature of water collected in a container.
3. If any adjustment is required, refer to LEVEL 1
PROGRAMMING in the Programming Section.
16
10420.1 040309
SERVICE (cont.)
Limit Thermostat
Location:
The limit thermostat is located on the tank lid.
To test the limit thermostat, access will also be needed
to the terminal block located at the rear of the dispenser.
If voltage was present as described, reconnect the black
wire and proceed to #5.
If voltage was not present as described, refer to the
Wiring Diagrams and check the dispenser wiring harness.
5. Check for continuity across the terminals of the
limit thermostat.
If continuity is not present as described, the circuit is
broken. Press the reset button of the limit thermostat
and recheck for continuity.
If continuity is not present as described, replace the
limit thermostat.
Removal and Replacement:
1. Remove both wires from the limit thermostat terminals.
2. Remove the two #10-32 nuts attaching the limit
thermostat to the top of the tank.
3. Install the new limit thermostat and secure into
place with two #10-32 nuts.
4. Refer to FIG. 4 when reconnecting the wires.
P4093
FIG. 3 LIMIT THERMOSTAT
Test Procedure:
1. Disconnect the dispenser from the power source.
2. There are two black wires on the limit thermostat
terminals. One comes from the terminal block. The
other goes directly to the tank heater terminal. Remove the black wire at the limit thermostat coming
from the terminal block.
3. Check the voltage across the black wire removed
from the limit thermostat and the white wire or red
wire of the terminal block with a voltmeter. Connect
the dispenser to the power source. The indication
must be:
a.) 100 to 120 volts ac for 100 to 120 volt models
or
b.) 200 to 240 volts ac for 200 to 240 volt models
or
c.) 230 volts ac for 230 volt models.
4. Disconnect the dispenser from the power source.
T
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BLK to Terminal Block
Reset
BLK to Tank Heater
P1776
FIG. 4 LIMIT THERMOSTAT WIRING
17
10420.1 040309
SERVICE (cont.)
Removal and Replacement:
1. Disconnect the black wires from the safety overflow
switch.
2. Remove the nut beneath the copper overflow
cup.
3. Remove the entire switch assembly from the cup.
4. Place the new switch assembly into the cup, wires
first. Make sure that a gasket is in place around the
threaded switch stem.
Safety Overflow Switch
NOTE - The magnets must be at the top of the float and
there must be NO stainless steel washers installed for
the safety overflow switch to operate properly.
P4093
FIG. 5 SAFETY OVERFLOW SWITCH
5. Install the nut beneath the copper overflow cup.
Be sure not to overtighten.
6. Reconnect the wires, FIG. 6.
Location:
The safety overflow switch is located inside the rear of
the dispenser inside the copper overflow cup.
For testing or removal of the safety overflow switch,
access may also be needed by removing the two screws
attaching the electronic control assembly to its mounting bracket.
T
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Adm thewith en
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at
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(B
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(F l
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).
Test Procedure:
1. Once voltage is verified at the power source, check
for continuity across the safety overflow switch
red wires only until the plastic float is raised and
check that continuity returns when the plastic float
is again lowered.
RED to BLK Wire from
Terminal Block
RED to BLK Wire from Electronic Control #3
P1777
If continuity is present as described, reconnect each
of the red wires to the black wires, the safety overflow
switch is operating properly.
If continuity is not present as described, replace the
safety overflow switch.
FIG. 6 SAFETY OVERFLOW WIRING
18
10420.1 040309
SERVICE (cont.)
7. Check the solenoid valve for coil action. Connect
the dispenser to the power source. Listen carefully
in the vicinity of the solenoid valve for a “clicking”
sound after approximately 5 seconds, as the coil
magnet attracts the plunger.
8. Disconnect the dispenser from the power source.
9. Reconnect the pink wire to terminal 5 of the electronic control board.
Solenoid Valve
Location:
The solenoid valve is located inside the rear of the
dispenser on the right side near the bottom.
To test the solenoid valve, access will also be needed
to the electronic control board.
!
WA
R
If the sound was heard as described and water will
not pass through the solenoid valve, there may be a
blockage in the water line before or after the solenoid
valve or the solenoid valve may require inspection for
wear and removal of waterborne particles.
If the sound was not heard as described, replace the
solenoid valve.
NIN
G
Removal and Replacement:
1. Remove all wires from the solenoid valve coil.
2. Turn-off the water supply to the dispenser.
3. Disconnect the water line from the solenoid
valve.
4. Remove the two 8-32 slotted-head screws holding
the solenoid valve and mounting bracket to the back
panel.
5. Lift-out the solenoid valve.
6. Securely install the new solenoid valve to the back
panel.
7. Securely fasten the water line to the solenoid
valve.
8. Reconnect the wires, FIG. 8.
P1778
FIG. 7 SOLENOID VALVE
Test Procedure:
1. Disconnect the dispenser from the power source
and turn-off the water supply to the dispenser.
2. Remove the pink wire from terminal 5 of the electronic control board.
3. Check the voltage across the solenoid valve coil
terminals with a voltmeter. Connect the dispenser
to the power source. The indication must be:
a.) 100 to 120 volts ac for 100 to 120 volt models
or
b.) 200 to 240 volts ac for 200 to 240 volt models
or
c.) 230 volts ac for 230 volt models
after a delay of approximately 5 seconds.
4. Disconnect the dispenser from the power source.
WHI/BLU to Electronic
Control Board T1
WHI or RED to
Terminal Block
If voltage was present as described, proceed to #5.
If voltage was not present as described, refer to the
Wiring Diagrams and check the dispenser wiring harness.
5. Remove both wires from the solenoid valve coil
terminals.
6. Check for continuity across the solenoid valve coil
terminals.
FIG. 8 SOLENOID VALVE WIRING
If continuity is present as described, reconnect the wires
and proceed to #7.
If continuity is not present as described, replace the
solenoid valve coil.
19
10420.1 040309
SERVICE (cont.)
Tank Heater
Location:
The tank heater is located in the tank lid.
FIG. 9 TANK HEATER
Removal and Replacement:
1. Remove the wires to the tank heater.
2. Remove the 8-32 nuts from the tank heater
flange.
3. Remove the tank heater.
4. Inspect the tank heater gasket and replace if necessary.
5. Securely install the new tank heater. Be certain of
a watertight seal.
6. Reconnect the wires, FIG. 10.
BLU to Control
Board Relay
P4093
Test Procedure:
1. Disconnect the dispenser from the power source.
2. Check the voltage across the terminals of the tank
heater with a voltmeter. Connect the dispenser to
the power source. The indication must be:
a.) 100 to 120 volts ac for 100 to 120 volt models
or
b.) 200 to 240 volts ac for 200 to 240 volt models
or
c.) 230 volts ac for 230 volt models.
3. Disconnect the dispenser from the power source.
BLK to Limit
Thermostat
FIG. 10 TANK HEATER WIRING
P1780
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Adm thewith en
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(B
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ion ua
(F l
DA
).
If voltage is present as described, proceed to #4.
If voltage is not present as described, replace the tank
heater.
4. Remove the tank heater from the tank lid and inspect
it for cracks in the sheath.
If the sheath shows no sign of damage, proceed to
#5.
If the sheath is damaged, replace the tank heater.
5. Check for continuity across the tank heater terminals.
If continuity is present as described, reinstall the tank
heater. The tank heater is operating properly.
If continuity is not present as described, replace the
tank heater.
20
10420.1 040309
L1
BLK
GRN
L2
RED
SCHEMATIC WIRING DIAGRAM H5E
BLK
BLK
LIMIT THERMOSTAT
BLK
WHI
MAIN ON/OFF SWITCH
(Late Models only)
WHI/VIO
BLU
TANK HEATER
BLK
OVERFLOW PROTECTION
SWITCH
RED
RED
WHI/VIO
BLK
RELAY
READY
GRY
PNK
GRY
PNK
PNK
GRY
GRY
PNK
POWER
REFILL
HEATER
MAIN
CONTROL
BOARD
J3
J4
J1
5
4
3
2
1
PNK
WHI
GRN
WHI/BLU
SOL
WHI
BLK
WHI
J5
TEMP.
SENSOR
100-120 VOLTS AC
2 WIRE + GND
SINGLE PHASE
REFILL
PROBE
40708.0000A 04/08 © 2008 BUNN-O-MATIC CORPORATION
White Strip-Tac Plus
Black Ink
Finished Size: 4.25" x 5.5"
~68% Reduction
21
10420.1 040309
L1
BLK
GRN
L2
RED
SCHEMATIC WIRING DIAGRAM H5X
BLK
BLK
LIMIT THERMOSTAT
BLK
WHI
MAIN ON/OFF SWITCH
(Late Models only)
WHI/VIO
BLU
TANK HEATER
BLK
OVERFLOW PROTECTION
SWITCH
RED
RED
WHI/VIO
BLK
RELAY
READY
GRY
PNK
GRY
PNK
PNK
GRY
GRY
PNK
POWER
REFILL
HEATER
MAIN
CONTROL
BOARD
J3
J1
J4
J5
5
4
3
2
1
PNK
WHI
GRN
WHI/BLU
SOL
WHI
BLK
WHI
GRY
GRY
t°
STEAM
SENSOR
TEMP.
SENSOR
100-120 VOLTS AC
2 WIRE + GND
SINGLE PHASE
REFILL
PROBE
40709.0000A 04/08 © 2008 BUNN-O-MATIC CORPORATION
White Strip-Tac Plus
Black Ink
Finished Size: 4.25" x 5.5"
~68% Reduction
22
10420.1 040309
L1
BLK
GRN
L2
RED
SCHEMATIC WIRING DIAGRAM H5E
BLK
BLK
LIMIT THERMOSTAT
BLK
RED
MAIN ON/OFF SWITCH
(Late Models only)
WHI/VIO
BLU
TANK HEATER
BLK
OVERFLOW PROTECTION
SWITCH
RED
RED
WHI/VIO
BLK
RELAY
READY
GRY
PNK
GRY
PNK
PNK
GRY
GRY
PNK
POWER
REFILL
HEATER
MAIN
CONTROL
BOARD
J3
J1
J4
5
4
3
2
1
PNK
RED
GRN
WHI/BLU
SOL
RED
BLK
WHI
J5
TEMP.
SENSOR
200-240 VOLTS AC
2 WIRE + GND
SINGLE PHASE
REFILL
PROBE
40710.0000A 04/08 © 2008 BUNN-O-MATIC CORPORATION
White Strip-Tac Plus
Black Ink
Finished Size: 4.25" x 5.5"
~68% Reduction
23
10420.1 040309
L1
BLK
GRN
L2
RED
SCHEMATIC WIRING DIAGRAM H5X
BLK
BLK
LIMIT THERMOSTAT
BLK
RED
MAIN ON/OFF SWITCH
(Late Models only)
WHI/VIO
BLU
TANK HEATER
BLK
OVERFLOW PROTECTION
SWITCH
RED
RED
WHI/VIO
BLK
RELAY
READY
GRY
PNK
GRY
PNK
PNK
GRY
GRY
PNK
POWER
REFILL
HEATER
MAIN
CONTROL
BOARD
J3
J1
J4
J5
5
4
3
2
1
PNK
RED
GRN
WHI/BLU
SOL
RED
BLK
WHI
GRY
GRY
t°
STEAM
SENSOR
TEMP.
SENSOR
200-240 VOLTS AC
2 WIRE + GND
SINGLE PHASE
REFILL
PROBE
40711.0000A 04/08 © 2008 BUNN-O-MATIC CORPORATION
White Strip-Tac Plus
Black Ink
Finished Size: 4.25" x 5.5"
~68% Reduction
24
10420.1 040309
SCHEMATIC WIRING DIAGRAM H5XA, H5EA
L1
L2
RED
BLK
GRN/YEL
RFI SUPPRESSION
CAPACITOR
BLK
LIMIT THERMOSTAT
LIMIT THERMOSTAT
BLK
BLU
BLK
WHI/VIO
TANK HEATER
BLK
BLK
BLK
OVERFLOW PROTECTION
SWITCH
RED
RED
EMI
FILTER
RELAY
GRY
PNK
GRY
PNK
PNK
GRY
GRY
PNK
REFILL
WHI/VIO
BLK
READY
POWER
RED
RED
J3-1
J3-5
J3-8
J1-1
HEATER
5
4
3
2
1
PNK
RED
GRN
WHI/BLU
SOL
RED
MAIN
CONTROL
BOARD
J4-1
J4-2
BLK
WHI
H5XA only
J1-5
230 VOLTS AC
2 WIRE + GND
SINGLE PHASE
JUMPER INSTALLED
ACROSS PINS 10 &
11 FOR H5E & H5X
J5-1
GRY
J5-3
GRY
J1-11
t°
STEAM
SENSOR
TEMP.
SENSOR
REFILL
PROBE
40712.0000D 04/09 © 2008 BUNN-O-MATIC CORPORATION
White Strip-Tac Plus
Black Ink
Finished Size: 4.25" x 5.5"
~68% Reduction
25
10420.1 040309
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