Bunn EASY CLEAR H5X, DV, EASY CLEAR H5E User Manual

H10X/H5X

H5E/DV PC

H5 ELEMENT

With Digital Control Board

SERVICE MANUAL

BUNN-O-MATIC CORPORATION

POST OFFICE BOX 3227

SPRINGFIELD, ILLINOIS 62708-3227

PHONE: [phone] FAX: [phone]

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.

42311.0000B 05/11 © 2011 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 [phone] 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.

392, AutoPOD, AXIOM, BrewLOGIC, BrewMETER, Brew Better Not Bitter, BrewWISE, BrewWIZARD, BUNN Espress, BUNN Family Gourmet, BUNN Gourmet, BUNN Pour-O-Matic, BUNN, BUNN with the stylized red line, BUNNlink, Bunn-OMatic, Bunn-O-Matic, BUNNserve, BUNNSERVE with the stylized wrench design, Cool Froth, DBC, Dr. Brew stylized Dr. design, Dual, Easy Pour, EasyClear, EasyGard, FlavorGard, Gourmet Ice, Gourmet Juice, High Intensity, iMIX, Infusion Series, Intellisteam, My Café, PowerLogic, Quality Beverage Equipment Worldwide, Respect Earth, Respect Earth with the stylized leaf and coffee cherry design, Safety-Fresh, savemycoffee.com, Scale-Pro, Silver Series, Single, Smart Funnel, Smart Hopper, SmartWAVE, Soft Heat, SplashGard, The Mark of Quality in Beverage Equipment Worldwide, ThermoFresh, A Partner You Can Count On, Air Brew, Air Infusion, Beverage Bar Creator, Beverage Profit Calculator, Brew better, not bitter., BUNNSource, Coffee At Its Best, Cyclonic Heating System, Digital Brewer Control, Nothing Brews Like a BUNN, Pouring Profits, Signature Series, Tea At Its Best, Phase Brew, The Horizontal Red Line, Titan, trifecta, Ultra, Velocity Brew are either trademarks or registered trademarks of Bunn-O-Matic Corporation.

2	42311 051910

WARNING - Inspection, testing, and repair of electrical equipment should be performed only by qualified service personnel. Disconnect the dispenser fromthe power source when servicing, except when electrical tests are required and the test procedure specifically states to connect the dispenser to the power source.

	CONTENTS
TroubleShooting............................................................................................	4
Component Access .......................................................................................	7
Electronic Controls...................................................................................	8-11
Limit Thermostat.........................................................................................	12
Safety Overflow Switch ...............................................................................	13
Solenoid Valve (Late Models)......................................................................	14
Solenoid Valve (Early Models) ....................................................................	15
Tank Heater .................................................................................................	16
Steam Sensor .............................................................................................	17
Dispense Valve (PC)....................................................................................	18
Electrical Schematic...............................................................................	19-23

3	42311 071310

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

Description of Failure

1Temperature Sensor (short)

2Temperature Sensor (open)

3Refill Fault (continuous refill for 15 minutes)

4Heater Fault (heater relay on for 120 minutes)

5Boil Thermistor (short) H5X/H10X only

6Boil Thermistor (open) H5X/H10X only

Problem	Probable Cause	Remedy
Equipment will not operate.	1. No power or incorrect voltage	(A) Check the terminal block for the cor-
		rect 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.
		(B) Check circuit breakers or fuses.

4	42311 071310

TROUBLESHOOTING (cont.)
Problem	Probable Cause
Equipment will not operate	2.	Safety overflow switch
(cont.)
Automatic refill will not oper-	1.	No water
ate after drawing hot water.	2.	Water strainer/flow control

3. Liquid level system

4. Solenoid valve

Water flows into the tank con-	1.	Solenoid valve
tinuously (Dispenser discon-
nected from power source).
Water flows into the tank con-	1.	Liquid level system
tinuously (Dispenser connect-
ed to power source).
Water is cold.	1.	Safety overflow switch
	2.	Limit thermostat

Remedy

Refer to Service – safety overflow switch for testing procedures.

Check plumbing and shut-off valves.

(A)Direction of flow arrow must be pointing towards dispenser.

(B)Remove the strainer/flow control and check for obstructions. Clear or replace.

Refer to Service – electronic controls for testing procedures.

Refer to Service – solenoid valve for testing procedures.

Refer to Service – solenoid valve for testing procedures.

Refer to Service – electronic controls for testing procedures.

Refer to Service – safety overflow switch for testing procedures.

Refer to Service – limit thermostat for testing procedures.

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.
4.	Temperature control	Refer to Service – electronic controls for
		testing procedures.

5	42311 071310

TROUBLESHOOTING (cont.)
Problem	Probable Cause		Remedy
Water boils continuously.	1.	Temperature control	Refer to Service – electronic controls for
			testing procedures.
	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.
3.	Water supply

Ready indicator will not light.

1. Temperature control

Plumbing lines should not be resting on the counter top.

(A)The dispenser must be connected to a cold water line.

(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).

Refer to Service – electronic controls for testing procedures.

2. Ready Indicator LED

Replace the indicator LED.

6	42311 071310

SERVICE

WARNING – Disconnect the dispenser from the power source before the removal of any panel or the replacement of any component. WARNING - Inspection, testing, and repair of electrical equipment should be performed only by qualified service personnel. Disconnect the dispenser fromthe power source when servicing, except when electrical tests are required and the test procedure specifically states to connect the dispenser to the power source.

Component Access - H5E/DV-PC/X	Component Access - H10X

P1770.30

The check valve, electronic control assembly, 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.

:$51,1* 9HU\ +RW :DWHU 8VH :LWK &DUH

P878.30

The check valve, electronic control assembly, overflow protection switch, solenoid valve, overflow tube temperature sensor, triac assembly (EARLY MODELS ONLY) and terminal block are located on the side of the dispenser. Access is gained by removing the side panel. The panel is attached with eight 8-32 slottedhead screws.

Faceplate Removal - H5 ELEMENT: After removing top cover, remove the two upper screws securing the faceplate. Carefully lift faceplate straight up until the three lower screws clear the key holes.

7	42311 022311

SERVICE	Liquid Level Control Flow Charts
Electronic Controls
	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	Yes	Does Water Flow	Yes
				Replace Probe
	Solenoid Valve
			?
	?
H 5	No		No
	Unplug Ready Lamp		Replace Solenoid Valve
P4093.35
FIG. 8a ELECTRONIC CONTROL	Voltage present at	Yes	Replace Ready Lamp
	Solenoid Valve
	?
	No
	Replace Control Board
Triac Assy
	H5E, H5X LIQUID LEVEL CONTROL
	PROBLEM: Overflows
	Drain cup
Electronic	Unplug Ready Lamp
	Retry
Control Board
%811	Overflow	No
			Replace Ready Lamp
	?
H 10	Yes
	Drain cup
	Disconnect Probe
P1991-1.30	Wire From Probe
	Short Probe Wire
FIG. 8b ELECTRONIC CONTROL	To Chassis
	Retry
BOARD AND TRIAC

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.

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	No		Replace Probe
	?
	Yes
	Drain cup
	Disconnect Wire From
	Solenoid Valve
	Retry
		Yes
	Overflow
				Replace Solenoid Valve
	?

No

Replace Control Board

8	42311 071310

SERVICE (cont.)

Electronic Controls (cont.)

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.

Temperature Control Flow Charts

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.

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.

SERVICE (cont.)

9	42311 071310

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 Flow Charts (cont.)

If voltage was present as described, reinstall the probe, the sensing function of the system is operating properly.

H5X THERMOSTAT

PROBLEM: Boils Excessively - Fills Cup

Drain cup

Retry

Red Light On While	Yes		Replace Steam Sensor
Boiling
?

	No
						Yes
Disconnect Blue Wire From				Still Boiling				Replace Control Assembly
Control Board Pin 7
		?
Retry
				No
				Finished
Still Boiling		Yes

?Replace Triac Assembly

	Check For Split
No	Tank Heater

Replace Control Board

If voltage was not present as described, check the pink probe wire and the green ground wire for continuity and/or replace the probe.

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.

H5E THERMOSTAT

PROBLEM: Boils

Drain cup

Retry

Red Light On While	Yes		Replace Control Assembly
Boiling
?

No

Disconnect Blue Wire From

Control Board Pin 7

Retry

Still Boiling		Yes
?				Replace Triac Assembly
				Check For Split
	No			Tank Heater

Replace Control Board

10	42311 071310

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 Bunn-O-Matic to order an electronic control board and temperature sensor for evaluation and proceed to #9.

6.Replace the electronic control board.

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

8.Disconnect the dispenser from the power source.

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

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.

BLU to Tank

Heater

WHI/VIO to

Terminal Block

J3 PNK & GRY to

Heater Indicator

Refill Indicator

Power Indicator

Ready Indicator

T5 PNK to Liquid

Level Probe

T4 WHI or RED to

Terminal Block

T3 BLK to Overflow Safety Switch

T2 GRN or GRN/YEL to Chassis Ground

T1 WHI/BLU to

Solenoid

J5 GRY & GRY toTherm- istor (H5X only)

J4 BLK & WHI to

Temperature Sensor

FIG. 11a WIRING CONNECTIONS

Adjustments

The H5X/H10X dispensers hold 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 Operating Manual.

11	42311 071310

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.

H 5

P4093

FIG. 12a LIMIT THERMOSTAT

H 10

P1993

FIG. 12b 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.

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.

BLK to Terminal Block	Reset
BLK to Tank Heater
	P1776
FIG. 12c LIMIT THERMOSTAT WIRING

12	42311 071310

SERVICE (cont.)

Safety Overflow Switch

H 5

P4093

FIG. 13a SAFETY OVERFLOW SWITCH

H 10

P1993

FIG. 13b OVERFLOW PROTECTION SWITCH

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.

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.

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.

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.

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.

5.Install the nut beneath the copper overflow cup. Be sure not to overtighten.

6.Reconnect the wires, FIG. 6.

RED to BLK Wire from

Terminal Block

RED to BLK Wire from Electronic Control #3

P1777

FIG. 13c SAFETY OVERFLOW WIRING

13	42311 071310

SERVICE (cont.)

Solenoid Valve (Late Models)

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.

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H 5

P1778

FIG. 14a 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.

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.

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.

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.

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.

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.

WHI/BLU to Electronic

Control Board T1

WHI or RED to

Terminal Block

FIG. 14b SOLENOID VALVE WIRING

14	42311 071310

SERVICE (cont.)

Solenoid Valve (Early Models)

Location:

The solenoid valve is located behind the large access panel on the left side of the dispenser.

To test the solenoid valve, access will also be needed to the electronic control board.

BUNN

H 10

P1994

FIG. 15a 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 200 to 240 volts ac for 200 to 240 volt models after a delay of approximately 5 seconds.

4.Disconnect the dispenser from the power source.

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.

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.

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.

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.

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 lines to and from the solenoid valve.

4.Remove the two 8-32 slotted-head screws holding the solenoid valve and mounting bracket to the component bracket.

5.Lift out the solenoid valve.

6.Remove the two 10-32 slotted-head screws holding the solenoid valve to its mounting bracket.

7.Securely install the new solenoid valve to its mounting bracket. The direction of flow arrow must be pointing towards the tank lid.

8.Attach the solenoid valve and mounting bracket to the component bracket.

9.Securely fasten the water lines to and from the solenoid valve.

10.Reconnect the wires, FIG. 8.

WHI/BLU to Contol

Board T1

RED to Terminal Block

RED to Control Board T4

P1779

FIG. 15b SOLENOID VALVE WIRING

15	42311 071310

SERVICE (cont.)

Tank Heater

Location:

The tank heater is located in the tank lid.

H 5

P4093

FIG. 16a TANK HEATER

H 10

P1993

FIG. 16b TANK HEATER

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.

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.

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	BLK to Limit
Board Relay	Thermostat

P1780

FIG. 16c TANK HEATER WIRING

HEATER	RESISTANCE
1800W-120V	07.44	- 08.67
4000W-240V	13.43	- 15.51
4000W-208V	10.09	- 11.99
6000W-240V	08.85	- 10.23
6000W-208V	06.67	- 07.70

TERMINAL TO SHEATH - INFINITE (OPEN)

16	42311 071310

SERVICE (cont.)

Steam Sensor (Thermistor)

Location:

The thermistor is located on the end of the overflow tube above the overflow cup.

To test the thermistor, access will also be needed to the electronic control board.

H 5X

P1993

FIG. 17a LOCATION

H 10X

P1993

FIG. 17b LOCATION

Test Procedure:

1.Disconnect the dispenser from the power source.

2.Disconnect the thermistor from J5 on control board.

3.Check the resistance across thermistor with a ohmmeter. The resistance range is approximately 9K @ room temperature to approximately 2K @ 200°F.

4.Disconnect the dispenser from the power source.

If resistance was present as described, the thermistor is working.

If resistance was not present as described, replace the control board.

17

Removal and Replacement:

1.Disconnect the dispenser from the power source.

2.Disconnect the thermistor from J5 on control board.

3.Loosen the set screw and the two screws securing the two half blocks together. Remove thermistor assembly from overflow tube.

4.Install new thermistor on tube and slide down until it contacts the flared end. NOTE: It’s critical that the thermistor be centered directly under the tube opening.

5.Snug the set screw so the block assembly does not move aroung easily.

6.Connect the thermistor to J5 on control board.

NOTE: DO NOT TEST OPERATION WITH PANELS REMOVED, AS AIR MOVEMENT CAN HINDER PROPER READINGS ON THERMISTOR.

Mounting screws

Set screw

DO NOT BEND

THERMISTOR

UP/DOWN

FIG. 17c STEAM SENSOR EXPLODED

Thermistor centered

under tube opening

FIG. 17d THERMISTOR POSITION

42311 080510

SERVICE (cont.)

Dispense Valve (PC Only)

Location:

The Dispense Valve is located behind control panel.

If voltage is not present as described, refer to Wiring Diagrams and check the dispenser wiring harness. Also check the control board for proper operation.

Bracket

Shroud

Dispense valve

Nut

Flare nut

FIG. 18a DISPENSE VALVE

Test Procedures:

1.Check the valve for coil action. Turn on the valve with the dispense button. Listen carefully in the vicinity of the dispense valve for a click as the coil pulls the plunger in.

If no sound is heard as described, proceed to #2. If the sound is heard as described, there may be a

blockage in the valve. Disconnect the dispenser from the power source. Remove the valve and inspect for blockage, and de-lime all related areas.

2.Connect voltmeter leads to the coil terminals. Turn on the valve with the dispense button. NOTE: Due to the internally rectified coil, the indication will be 120VAC all the time. Set the meter to DC volts. The indication should be 170VDC when activated. If the polarity of meter leads are reversed, reading will indicate -170VDC. (Double these readings for 240 volt coils)

If voltage is present as described, but no coil action is observed, valve is defective. Replace valve and test again to verify repair.

Removal and Replacement:

1.Disconnect the dispenser from the power source and allow to cool.

2.Drain enough water from the tank so the water level is below the outlet.

3.Remove the nut and flare nut from the valve.

4.Remove the top cover, shroud, and bracket.

5.Disconnect wires from the valve.

6.Using a back up wrench to hold fitting in place, Remove the valve.

7.Wrap threads of fitting with Teflon tape and install new valve.

8.Install bracket, nut, flare nut, wires and covers.

FIG. 18b

VALVE REMOVAL

REPAIR KIT

FIG. 18c

VALVE REPAIR KIT

18	42311 071310

	L1	N	L2		SCHEMATIC WIRING DIAGRAM H5E-DV PC
GRN	BLK-14			RED-14
	Earth Ground
	MASTER ON/OFF
	SWITCH
Chassis Ground
	BLK-18			RED-14
LIMIT			SELECTOR
				SWITCH		TANK HEATER
THERMOSTAT					BRN-14
	BLK-14
BLK-14		-14				4000 W	TANK HEATER
					WHI/VIO-14			WHT-14
		BLU					1800 W
N.C.				WHI/BLU-18		120VAC	REFILL	WHT-18
OVERFLOW							SOL
PROTECTION SWITCH

-18	4				3	WHI-18
BLK
	2				1J7	VIO-18	120VAC				WHT-18
									SOL
											DISPENSE

5

4

N.O.

3

COM

2

MAIN

RELAY

1

CONTROL

J6-1

PINK-22

GRN-18

BOARD

J5-1

-

GRY

STEAM SENSOR

USED ON

0-3.3VDC

t°

FACTORY

+

GRY

H5X ONLY

BLK-24

J4-1

-

1

6

J2

0-3.3VDC

+

WHI-24

J3-1

J1-1

0-13.8VAC

5

10

USE ONLY

J3-5

J1-5

TANK

H5-PC

Switch “Hidden”

Dispense Right

DispenseMiddle

DispenseLeft

Dispense/StopManual

Heater

ASSYSWITCHMEMBRANE

BUNN-O-MATIC

NO JUMPER

t°

Early H5E, H5X, H10X

Install jumper thru ver. 1.04

Power

STATIC

SHIELD

NOTE: no jumper used on any

Ready

Model starting with ver. 1.08

120V AC 2 WIRE + GND

120/208V AC 3 WIRE + GND

39333.0000D 09/09

120/240V AC 3 WIRE + GND

©2006

SINGLE PHASE

CORPORATION

19	42311 071310

GRN

L1

L2

SCHEMATIC WIRING DIAGRAM H5E-PC

BLK-14

RED-14

Earth Ground

EMI

FILTER

Chassis Ground

BLK-18

RED-14

LIMIT

LIMIT

THERMOSTAT

TANK HEATER

THERMOSTAT

BLK-14

BLK-14

BLU-14

BLU-14

4000 W

N.C.		REFILL		RED-18
OVERFLOW	WHI/BLU-18	230VAC	SOL
PROTECTION SWITCH

-18	4			3	RED-18
BLK
	2			1J7	VIO-18	DISPENSE					RED-18
						230VAC			SOL

5

4

N.O.

3

COM

2

MAIN

RELAY

1

CONTROL

J6-1

PINK-22

GRN-18

BOARD

STEAM SENSOR

J5-1

-

GRY

USED ON

0-3.3VDC

t°

FACTORY

+

GRY

H5X ONLY

J4-1

-

1

6

J2

0-3.3VDC

+

J3-1

J1-1

5

10

USE ONLY

J3-5

J1-5

H5-PC

Switch“Hidden”

DispenseRight

DispenseMiddle

DispenseLeft

Dispense/StopManual

Heater

NO JUMPER

Early H5E, H5X, H10X

Install jumper thru ver. 1.04

Power

NOTE: no jumper used on any

Ready

Model starting with ver. 1.08

230V AC 2 WIRE + GND

SINGLE PHASE

BLK-24

WHI-24

0-13.8VAC

							TANK
								t°
						STATIC
SWITCH MEMBRANE					SHIELD
		39333.0001C 10/09
ASSY		©2006
					BUNN-O-MATIC
					CORPORATION

20	42311 071310

			SCHEMATIC WIRING DIAGRAM H10X
						GRN		L1	L2 or N
						Earth Ground
						MAIN ON/OFF SWITCH
						(Late Models only)
				Chassis Ground
						BLK-18
						BLK-14			-14
						BLK-14
						TRIAC			WHI/VIO
	LIMIT THERMOSTAT				BLU-14
	BLK-14		BLK-14
									-14
			TANK HEATER
							TRIAC		WHI/VIO
	LIMIT THERMOSTAT
	BLK-14		BLK-14		BLU-14
									-18
			TANK HEATER
	OVERFLOW PROTECTION								WHI
		SWITCH
									or
	RED	RED	BLK-18
									RED
	4	3
	2	J7	BLU-20
		1
			TAN-20
			BLU-20
			TAN-20
		18	BRN/BLK-18		5	PINK-22
		-
		BLU				RED-18 or WHI-18
					4
			N.O.			RED-18 or WHI-18
					3
						GRN-18
			COM		2
						WHI/BLU-18
			RELAY		1		SOL
	MAIN
	CONTROL		J6-1
	BOARD					STEAM SENSOR
			0-3.3VDC	J5-1	-	GRY	t°	USED ON
FACTORY					+	GRY		H5X ONLY
				J4-1	-				BLK-24
1	J2 6		0-3.3VDC
					+				WHI-24
			J3-1	J1-1		GRY
						PNK			0-13.8VAC
5	10					GRY
USE ONLY			J3-5			PNK
				J1-5		PNK
						GRY
						GRY
						PNK
			H5-PC						TANK
									t°
			NO JUMPER
	Early H5E, H5X, H10X					HEATER	READY
Install jumper thru ver. 1.04
NOTE: no jumper used on any						REFILL	POWER	200-240 VOLTS AC
									2 WIRE + GND
Model starting with ver. 1.08
40707.0000C		09/09 © 2008 BUNN-O-MATIC CORPORATION							SINGLE PHASE
					21				42311 071310

			SCHEMATIC WIRING DIAGRAM H5E/H5X
							GRN	L1	L2 or N
							Earth Ground
							MAIN ON/OFF SWITCH
							(Late Models only)
				Chassis Ground			BLK-18
							BLK-14
	LIMIT THERMOSTAT								-18
									WHI
	BLK-14	BLK-14			BLU-14
			TANK HEATER						or
									RED
	OVERFLOW PROTECTION
	RED	SWITCH	BLK-18
		RED
				BLU-20
	4	3
	2	1J7						WHI/VIO-14
		-18			5		PINK-22
							RED-18 or WHI-18
					4
		BLU
			N.O.				RED-18 or WHI-18
					3
							GRN-18
			COM		2
							WHI/BLU-18
			RELAY		1			SOL
	MAIN
	CONTROL		J6-1
	BOARD						STEAM SENSOR
					-	GRY
			0-3.3VDC	J5-1			t°	USED ON
FACTORY					+	GRY		H5X ONLY
				J4-1	-				BLK-24
1	J2 6		0-3.3VDC
					+				WHI-24
			J3-1	J1-1		GRY
						PNK			0-13.8VAC
5	10					GRY
USE ONLY			J3-5			PNK
				J1-5		PNK
						GRY
						GRY
						PNK
			H5-PC						TANK
									t°
			NO JUMPER
	Early H5E, H5X, H10X					HEATER		READY
Install jumper thru ver. 1.04
							REFILL	POWER	100-120 VOLTS AC
NOTE: no jumper used on any									or
Model starting with ver. 1.08									200-240 VOLTS AC
									2 WIRE + GND
42375.0000A		09/09 © 2009 BUNN-O-MATIC CORPORATION							SINGLE PHASE
					22				42311 071310

SCHEMATIC WIRING DIAGRAM H5XA, H5EA (CE)

GRN/YEL

L1 L2

Earth Ground

Chassis Ground

BLK-14

LIMIT THERMOSTAT

LIMIT THERMOSTAT

BLK-14

BLK-14

TANK HEATER

BLU-14

RFI SUPPRESSION

BLK-18

RED-18

CAPACITOR

EMI

BLK-18

RED-18

FILTER

OVERFLOW PROTECTION
RED SWITCH RED		BLK-18
4	3	BLU-14
2	1J7	WHI/VIO-14

5		PINK-22

4RED-18

MAIN

3

CONTROL

N.O.

2

GRN-18

WHI/BLU-18

RED-18

COM

1

SOL

BOARD

RELAY

J6-1

STEAM SENSOR

0-3.3VDC

J5-1

-

GRY

t°

USED ON

+

GRY

H5X ONLY

FACTORY

BLK-24

0-3.3VDC J4-1

-

1

6

J2

+

WHI-24

J3-1

GRY

J1-1

PNK

5

10

GRY

PNK

USE ONLY

J3-5

J1-5

PNK

0-13.8VAC

GRY

GRY

PNK

H5-PC

TANK

NO JUMPER

t°

Early H5E, H5X, H10X

HEATER

READY

Install jumper thru ver. 1.04

REFILL

POWER

NOTE: no jumper used on any

230 VOLTS AC

Model starting with ver. 1.08

2 WIRE + GND

40712.0000F 05/11

© 2008 BUNN-O-MATIC CORPORATION

SINGLE PHASE

23	42311 050511

	GRN or GRN/YEL			SCHEMATIC WIRING DIAGRAM H5 ELEMENT
			L1	L2 or N
	Earth Ground
				TERMINAL BLOCK
Chassis Ground			BLK	RED
				MASTER ON/OFF
				SWITCH
		BLK		WHI/BLU
		BRN/BLK		RED
				LIMIT
		TANK HEATER	THERMOSTAT
			BLU
			2	1
	N.C.	BLK	4	3		REFILL
	OVERFLOW
					TAN
PROTECTION SWITCH						SOL
	BRN/WHI 2	J2				WHI/RED
		1
	4	3
				BRN
	MAIN
BLK	CONTROL		N.O.
	BOARD		COM
	1	5	RELAY
	J1
		DISPLAY		J4-1		PINK
						GRN/YEL
		BOARD		J3-1	-	GRY	STEAM SENSOR	USED ON
							t°
	5				+	GRY		H5X ONLY
	1			J2-1	-	BLK			TEMP PROBE
	J5
					+	WHI
				J1-1				REFILL
								PROBE
				J1-5
									TANK
									t°
	100-240V AC 2 WIRE + GND							44657.0000B	05/11 ©2011
								BUNN-O-MATIC CORPORATION
	SINGLE PHASE
				24					42311 050511