Bunn TB6Q, TB6 User Manual

TB3/TB6 Series

Including: TB3; TB3-LP;

TB3Q; TB3Q-LP; TB6; TB6Q

STARTING WITH SERIAL NUMBER: TU00020000

SERVICE & REPAIR MANUAL

BUNN-O-MATIC CORPORATION

POST OFFICE BOX 3227

SPRINGFIELD, ILLINOIS 62708-3227

PHONE: [phone] FAX: [phone]

41722.0000A 07/09 ©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 [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.

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.

Page 2	41722 012609

	Contents
Trouble Shooting..............................................................................................................	4
Component Acess ..........................................................................................................	10
Control Thermostat.........................................................................................................	10
Limit Thermostat............................................................................................................	12
Tank Heater.....................................................................................................................	13
Lighted ON/OFF Switch...................................................................................................	14
Non Lighted ON/OFF Switch...........................................................................................	15
Start Switches................................................................................................................	16
Inlet Solenoids................................................................................................................	17
Dual Timer (TB3/TB6).....................................................................................................	18
Digital Timer (TB3Q/TB6Q).............................................................................................	20
Schematic Wiring Diagrams..........................................................................................	22

Page 3	41722 070209

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 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 brewer is heated at all times. Keep away from combustibles.

WARNING – • Exercise extreme caution when servicing electrical equipment.

•Unplug the brewer when servicing, except when electrical tests are specified.

•Follow recommended service procedures

•Replace all protective shields or safety notices

PROBLEM

PROBABLE CAUSE

REMEDY

Brew cycle will not start	1.	No water
	2.	No power or incorrect voltage
	to the brewer

Water lines and valves to the brewer must be open.

(A1) Check the wire crimps for

120 volts across the black and white terminals on two wire 120 volt brewers.

(A2) Check the wire crimps for

200 volts on "B Series" brewers or 230 volts on "A Series" brewers across the red and black terminals.

(B) Check circuit breakers or fuses.

Page 4	41722 070209

TROUBLESHOOTING (cont.)
PROBLEM	PROBABLE CAUSE		REMEDY
Brew cycle will not start (cont.)	3. ON/OFF Switch		Refer to Service - ON/OFF
			Switch for testing.
	4.	Start Switch	Refer to Service - Start Switch
			for testing procedures.
	5.	Timer	Refer to Service - Timer for test-
			ing procedures.
	6.	Solenoid Valve	Refer to Service - Solenoid Valve
			for testing procedures.
	7.	Water strainer/flow control	(A) Direction of flow arrow must
		(If equipped)	be pointing towards brewer.
			(B) Remove the strainer/flow
			control and check for obstruc-
			tions. Clear or replace.
Water is not hot	1. (A) Limit Thermostat		Refer to Service - Limit Ther-
		(B) Thermal Cut-Off (230V)	mostat for testing procedures.
	CAUTION - Do not eliminate		Thermal Cut-Off for testing
	or bypass limit thermostat or		procedures.
	thermal cut-off. Use only BOM
	replacement parts.
	2.	Control Thermostat	Refer to Service - Control Ther-
			mostat for testing procedures.
	3.	Tank Heater	Refer to Service - Tank Heater
			for testing procedures.

Page 5	41722 070209

TROUBLESHOOTING (cont.)
PROBLEM	PROBABLE CAUSE
Inconsistent beverage level in	1. Strainer /flow control
dispenser	(If equipped)

2. Syphon System

3. Lime Build-up

CAUTION - Tank and tank components should be delimed regularly depending on local water conditions. Excessive mineral build-up on stainless steel surfaces can initiate corrosive reactions resulting in serious leaks.

4. Water Pressure

Consistently low beverage level	1.	Timer
in the dispenser
	2.	Strainer/flow Control
	(If equipped)

Spitting or excessive steaming	1. Lime Build-up
	CAUTION - Tank and tank com-
	ponents should be delimed
	regularly depending on local
	water conditions. Excessive min-
	eral build-up on stainless steel
	surfaces can initiate corrosive
	reactions resulting in serious
	leaks.
	Page 6

REMEDY

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

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

The brewer must be level or slightly lower in front to syphon properly.

Inspect the tank assembly for excessive lime deposits. Delime as required.

The water pressure to the brewer must be at least 20 psi (138kPa) and minimum 1.0 gpm flow rate.

Timer dial must indicate at least two minutes and fifteen seconds. Refer to Operating Manual.

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

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

Inspect tank assembly for excessive lime deposits. Delime as required.

41722 070209

TROUBLESHOOTING (cont.)

PROBLEM

Spitting or excessive steaming (cont.)

Dripping from sprayhead

Water flows into tank continuously (ON/OFF Switch "ON")

Water flows into tank continuously (ON/OFF Switch "OFF")

Beverage overflows dispenser

PROBABLE CAUSE

2. Control Thermostat

1.Syphon System

2.Lime Build-up

CAUTION - Tank and tank components should be delimed regularly depending on local water conditions. Excessive mineral build-up on stainless steel surfaces can initiate corrosive reactions resulting in serious leaks.

3. Solenoid Valve

1. Timer

1. Solenoid Valve

1.Dispenser

2.Timer

3.Solenoid Valve

Page 7

REMEDY

Refer to Service - Control Thermostat for testing procedures.

The brewer must be level or slightly lower in front to syphon properly.

Inspect the tank assembly for excessive lime deposits. Delime as required.

Remove the solenoid valve and clear any obstructions. Rebuild or replace the valve if necessary.

Refer to Service - Timer for testing procedures.

Remove the Solenoid Valve and clean any obstruction. Rebuild or replace the valve if necessary.

The dispenser must be completely empty before starting a brew cycle.

Refer to Service - Timer for testing procedures.

Remove the Solenoid Valve and clean any obstruction. Rebuild or replace the valve if necessary.

41722 070209

TROUBLESHOOTING (cont.)
PROBLEM	PROBABLE CAUSE
Weak beverage	1. Filter Type
	2.	Coffee Grind
	3.	Sprayhead
	4.	Funnel Loading
	5.	Water Temperature

Dry coffee grounds remain in the	1. Funnel Loading
funnel

Brewer is making unusal noises

1. Solenoid

2. Plumbing Lines

3. Water Supply

Page 8

REMEDY

BUNN® paper filters must be used for proper extraction.

A fine or drip grind must be used for proper extraction.

A six-hole stainless steel sprayhead must be used for proper extraction.

The BUNN® paper filter must be centered in the funnel and the bed of ground leveled by gentle shaking.

Place an empty funnel on an empty dispenser beneath the sprayhead. Initiate a brew cycle and check the water temperature immediately below the sprayhead with a thermometer. The reading should not be less than 200°F (93°C). Adjust the control thermostat to increase the water temperature. Replace if necessary.

The BUNN® paper filter must be centered in the funnel and the bed of grounds leveled by gently shaking.

The nut on the solenoid must be tight or it will vibrate during operation.

Plumbing lines should not resting on the counter top.

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

(B)Water pressure to the brewer must not exceed 90 psi (620 kPa). Install a regulator if necessary to lower the working pressure to approximately 50 psi (345 kPa).

41722 070209

TROUBLESHOOTING (cont.)
PROBLEM	PROBABLE CAUSE	REMEDY
Brewer is making unusal noises	4. Tank Heater	Remove and clean lime off the
(cont.)		tank heater.

Page 9	41722 070209

SERVICE

This section provides procedures for testing and replacing various major components used in this brewer should service become necessary. Refer to Troubleshooting for assistance in determining the cause of any problem.

WARNING - Inspection, testing, and repair of electrical equipment should be performed only by qualified service personnel. The brewer should be unplugged when servicing, except when electrical tests are required and the test procedure specifically states to plug-in the brewer.

COMPONENT ACCESS

WARNING - Disconnect the brewer from the power source before the removal of any panel or the replacement of any component.

All components are accessible by the removal of the top cover, front inspection panel, and rear panel.

FIG. 10-1 COMPONENT ACCESS

CONTROL THERMOSTAT

FIG. 10-2 CONTROL THERMOSTAT

Location:

The control thermostat is located in the hood.

Test Procedures:

1.Disconnect the brewer from the power source.

2.Locate the blue wire on the control thermostat.

3.Check the voltage across the blue/black wire on the control thermostat and the white wire on the tank heater on 120V models or red wire on the tank heater on two wire 200V or 230V models with a voltmeter. Connect the brewer to the power source. The indication must be:

a)120 volts ac for two wire 120 volt models.

b)200 to 230 volts ac for two wire 200 or 230 volt models.

4.Disconnect the brewer from the power source.

If voltage is present as described, proceed to #5.

If voltage is not present as described, refer to the wiring diagrams and check the brewer wiring harness.

5.Locate the black wire on the control thermostat.

6.Gently remove the capillary bulb and grommet from the tank.

7.Check the voltage across the black wire of the control thermostat and the white wire on the tank heater on 120V models or red wire on the tank heater on two wire 200V or 230V models with a voltmeter when the control thermostat is turned fully clockwise. Connect the brewer to the power

(CONTINUED)

Page 10	41722 070209

SERVICE (cont.)

CONTROL THERMOSTAT (cont.)

source. The indication must be:

a)120 volts ac for two wire 120 volt models.

b)200 to 230 volts ac for two wire 200 volt or 230 volt models.

8.Disconnect the brewer from the power source.

If voltage is present as described, reinstall the capillary tube into the tank to the line 4.5" above the bulb, the control thermostat is operating properly.

If voltage is not present as described, replace the thermostat.

Removal and Replacement:

1.Disconnect the control thermostat wires.

2.Remove the thermostat capillary bulb by firmly pulling-up on the capillary at the tank lid. This will

disengage the grommet from the tank lid.		FIG. 11-1 CONTROL THERMOSTAT TERMINALS

3.Remove the one #6-32 screw securing the control thermostat to the component bracket inside the hood.

4.Slide the grommet to the line 4.5" above the bulb on the new capillary tube.

5.Insert the capillary bulb through the hole in the tank lid and press the grommet firmly and evenly so that the groove in the grommet fits into the tank lid.

6.Carefully bend the capillary tube so that the tube and bulb inside the tank are in the vertical position.

NOTE - The capillary tube must be clear of any electrical termination and not kinked.

7.Using one #6-32 screw, secure the control thermostat to the component bracket inside the hood.

8.Adjust the control thermostat as required.

FIG. 11-2 REPLACEMENT CONTROL THERMOSTAT

Page 11	41722 070209

SERVICE (cont.)

LIMIT THERMOSTAT

FIG. 12-1 LIMIT THERMOSTAT

Location:

The limit thermostat is located inside the rear of the hood on the tank lid.

Test Procedures:

1.Disconnect the brewer from the power source.

2.Disconnect the blue and black wires from the limit thermostat.

3.Check for continuity across the limit thermostat terminals with a ohmmeter.

Ifcontinuityispresentasdescribed,thelimitthermostat is operating properly.

If continuity is not present as described, replace the limit thermostat.

Removal and Replacement:

1.Remove all wires from limit thermostat terminals.

2.Carefully slide the limit thermostat out from under the retaining clip and remove limit thermostat.

3.Carefully slide the new limit thermostat into the retaining clip.

4.Refer to the schematics when reconnecting the wires.

to Tank				Lead from
Heater Switch			Control Thermostat

FIG. 12-2 LIMIT THERMOSTAT TERMINALS

Page 12	41722 070209

SERVICE (cont.)

TANK HEATER

FIG. 13-1 TANK HEATER

Location:

The tank heater is located inside the tank and secured to the tank lid.

Test Procedures:

1.Disconnect the brewer from the power supply.

2.Turn on thermostat. Check the voltage across the black and white wires on 120 volt models or the black and red wires for 200 volt models and 230 volt models with a voltmeter. Connect the brewer to the power source. The indication must be:

a)120 volts ac for two wire 120 volt 20 amp models .

b)200 to 230 volts ac for two wire 200 or 230 volt models.

3.Disconnect the brewer from the power source.

If voltage is present as described, proceed to #4

If voltage is not present as described, refer to the Wiring Diagrams and check wiring harness.

4.Disconnect the wires from the tank heater terminals.

5.Check resistance value across tank heater terminals and compare to chart.

If resistance is present as described, reconnect the wires, the tank heater is ok.

HEATER	RESISTANCE
1680W-120V	7.9	- 9.2
1680W-100V	5.5	-6.4
1680W-230V	29.0	-33.7

TERMINAL TO SHEATH - INFINITE (OPEN)

If resistance is not present as described, replace the tank heater.

NOTE- If any resistance is read between sheath and either terminal, remove and inspect heater for cracks in the sheath.

Removal and Replacement:

1.Disconnect the brewer from the power supply.

2.Disconnect the water supply from the brewer.

3.Disconnect the wires from the limit thermostat.

4.Disconnect the wires from the tank heater terminals.

5.Remove sprayhead and the hex nut securing the sprayhead tube to the hood. Set aside for reassembly.

6.Remove the six #10 screws securing the tank lid to the tank.

7.Remove the tank lid with limit thermostat, sprayhead tube and tank heater.

8Remove the two hex nuts securing the tank heater to the tank lid. Remove tank heater with gaskets

and discard.

9.Install new tank heater with gaskets on the tank lid and secure with two hex nuts.

10.Install tank lid with limit thermostat, sprayhead tube and tank heater using six #10 screws.

11.Secure sprayhead tube to hood using hex nut removed in step 4.

12.Install sprayhead.

15.Reconnect the wires to the limit thermostat and tank heater.

16.Reconnect the water and power supply.

Page 13	41722 070209

SERVICE (cont.)

LIGHTED ON/OFF SWITCH (TB3/TB3Q)

P/N 37080.0000

Orange light

FIG. 14-1 LIGHTED ON/OFF SWITCH

Location:

The ON/OFF switch is located in the front of the hood, above and to the left of the brew funnel.

Test Procedure:

Brewers W/Out Half Batch or Sweetener Options

1.Disconnect the brewer from the power source.

2.Remove the wires from all four terminals.

3.Check for continuity across the two terminals on the lower right of the switch (as shown). Continuity must be present across these terminals in the ON position.

If continuity is present as described, reconnect the wires, the switch is operating properly. If continuity is not present as described, replace the switch.

NOTE: No continuity will show across the upper left terminals of the lighted switch since the light is neon.

Removal and Replacement:

1.Remove the wires from the switch terminals.

2.Compress the clips inside the hood and gently push the switch through the opening.

3.Push the new switch into the opening and spread the clips to hold the switch captive in the hood.

4.Refer to FIG. 14-2 when reconnecting the wires.

BLACK

WHITE

WHT/VIO

P/N 37080.0000

2 WHT/VIO

FIG. 14-2 LIGHTED ON/OFF SWITCH TERMINALS

Page 14	41722 070209

SERVICE (cont.)

	ON/OFF SWITCH-TB6/Q (Sweetner ½ Batch Option-TB3/Q)
		WHI/VIO
		BLACK
		PINK
		optional
	P/N 03356.0003	½ batch
		GRAY
	Non Lighted
		Optional
		½ batch
	FIG. 15-1 NON LIGHTED ON/OFF SWITCH	FULL/OFF/HALF-TB3/TB3Q
	Location:	WHI/VIO
	The switch is located on the front control panel.
	Test Procedure:	WHITE
	1. Disconnect the brewer from the power source.
	2. Disconnect the wires from switch terminals.	BRN/WHI
	3. Check for continuity across the center and right
	and across center and left terminals in rows one	WHI/GRN
	through four when the switch is in the oposite
	position.	BLACK
	If continuity is not present as described, replace the	WHI/VIO
	switch.	UNSWEET/OFF/SWEET-TB3/TB3Q
	If continuity is present as described, replace the wires
		w/SWEETENER & EMPTY DETECT
	the switch is operating properly.
	Removal and Replacement:	WHI/VIO
	1. Remove the wires from the switch terminals.
	2. Remove the clips on the switch bezel inside the
	hood and gently push the switch through the	YELLOW
	opening.
	3. Push the new switch into the opening from inside	BLACK
	the hood and secure into place by pressing the
	bezel through the front of the hood. Make sure
	the clips on the switch bezel are locked around
	the switch housing and spread the clips to hold	BRN/BLK
	the switch captive in the hood.	LEFT/OFF/RIGHT-TB6
	4. Refer to FIG. 15-2 when reconnecting the wires.
		FIG. 15-2 ON/OFF SWITCH TERMINALS
	Page 15	41722 070209

SERVICE (cont.)

START SWITCHES

P/N 37079.0000	P/N 37080.0001
Non Lighted	Green ready light

FIG. 16-1 START SWITCHES

Location:

The start switch is located in the front of the hood, above and to the right of the brew funnel.

Test Procedure:

1.Disconnect the brewer from the power source.

2.Remove the wires from all four terminals.

3.Check for continuity across the two terminals on the right side of the switch when it is held in the lower position. Continuity must not be present across these terminals in the upper position.

4.Check for continuity across the two terminals on the left side of the switch when it is held in the lower position. Continuity must not be present

across these terminals in the upper position.

If continuity is not present as described, replace the switch.

If continuity is present as described, reconnect the wires, the switch is operating properly.

If continuity is not present as described, replace the switch.

NOTE: No continuity will show across the left terminals of the lighted switch since the light is neon.

Removal and Replacement:

1.Remove the wires from the switch terminals.

2.Compress the clips inside the hood and gently push the switch through the opening.

3.Push the new switch into the opening and spread the clips to hold the switch captive in the hood.

4.Refer to Fig. 16-2 when reconnecting the wires.

Page 16

WHI/YEL to Timer T5

WHI/ORN to Timer T3

P/N 37079.0000

WHI/YEL to Timer T5

GREEN

WHI/ORN to Timer T3

RED

P/N 37079.0000

WHI/YEL to Timer T5

BLK to T. Stat

WHI/ORN to Timer T3

BLU/BLK

P/N 37080.0001 to T. Stat

FIG. 16-2 START SWITCH TERMINALS

41722 070209

	SERVICE (cont.)
	INLET VALVES						three wire 120/240 volt models.
							b) 200 to 230 volts ac for two wire 200 or 230 volt
							models.
						7.	Disconnect the brewer from the power source,
						If voltage is present as described, proceed to #8
						If voltage is not present as described, refer to Wiring
						Diagrams and check brewer wiring harness.
						8.	Check for continuity across the solenoid termi-
							nals.
						If continuity is present as described, reconnect the
						white and black wire from the timer.
						If continuity is not present as described, replace the
		FIG. 17-1 INLET VALVES
						solenoid valve.
	Location:					Removal and Replacement:
	The solenoid valve(s) are located inside the trunk
						1.	Disconnect the brewer from the power source.
	on the lower center part of the component bracket. So-
						2.	Turn off the water supply to the brewer.
	lenoids in the early models are located in the hood.
						3.	Remove the wires from the solenoid.
	Test Procedures:					4.	Disconnect the water lines to and from the solenoid
							valve.
	1. Check the solenoid valve for coil action. With "ON/
						5.	Remove the two screws securing the solenoid
	OFF" switch in the "ON' upper position press start
							mounting bracket to the component bracket.
	switch and listen carefully in the vicinity of the
						6.	Install new solenoid valve to the component
	solenoid valve for a" clicking" sound			as the coil
							bracket.
	magnet attracts.
						7.	Securely fasten the water lines to and from the
	2. Disconnect the brewer from the power source.
							solenoid valve.
	If the sound is heard as described and water will not					8.	Refer to schematics when reconnecting the
							wires.
	pass through the solenoid valve, there may be a block-
	age in the water line before the solenoid valve or, the
	solenoid valve may require inspection for wear, and
	removal of waterborne particles.
	If the sound is not heard as described,			proceed to
	#3.

3. Disconnect the brewer from the power source.

4. Connect a voltmeter across the solenoid terminals (leave wires connected).

5. Connect the brewer to the power source. With the "ON/OFF" switch in the "ON" upper position press the start switch.

6. Check the voltage across the solenoid. The indication must be:

a) 120 volts ac for two wire 120 volt models and

Page 17	41722 070209

SERVICE (cont.)

BREW/DILUTION TIMER (TB3 & TB6)

FIG. 18-1 BREW/DILUTION TIMER

Location:

The timer is located in left side of the hood.

Test Procedure:

NOTE: Do not remove or install wires while timer board is installed. Pressure applied to one side may cause damage to the board.

1.Disconnect the brewer from the power source and remove the top cover.

2.With a voltmeter, check the supply voltage across terminals TL1 and TL2. Connect the brewer to the power source. Turn on the "ON/OFF" switch. The voltage must be:

a)120 volts ac for two wire 120 volt models.

b)200 to 230 volts ac on two wire 200 volt or 230 volt models.

3.Disconnect the brewer from the power source.

If voltage is present as described, proceed to #4.

If voltage is not present as described, refer to the Wiring Diagrams and check the wiring harness.

4.With a voltmeter, check the BREW output voltage across terminals TL2 and TL4; and the DILUTION output voltage across terminals TL2 and TL6.

Connect the brewer to the power source, turn on the "ON/OFF" switch and press the "START" switch. The voltage must be:

a)120 volts ac for two wire 120 volt models.

b)200 to 230 volts ac for two wire 200 volt or 230 volt models.

If voltage is present as described, the timer is operating properly.

If voltage is not present as described, disconnect the brewer from the power source and replace the timer.

Removal and Replacement:

1.Remove the two #6-32 screws, lock washers and spacers securing timer to bracket.

2.Disconnect all wires from the timer.

3.Refer to schematic and reconnect wires.

4.Install new timer to bracket with the two #6-32 screws, lock washers and spacers.

5.Adjust the timer as required.

SW1

J-1

TRM-1

TRM-2

TRM-3

TRM-4

TRM-5

TRM-6

J-4

FIG. 18-2 TIMER TERMINALS

Terminals:

J-1 ½ batch connector

J-4 Dilution delay time 1-2 (NORMAL), 3-4 (2x) SW-1 Programming Enable/Disable

TRM-1 White/Violet		L1 in from ON/OFF switch
TRM-2 White (Red)		Neutral (L2)
TRM-3	White/Orange	Start switch
TRM-4	White/Green	Brew solenoid
TRM-5	White/Yellow	Start switch
TRM-6	White/Blue	Dilution solenoids

Page 18	41722 070209

SERVICE (cont.)

BREW/DILUTION TIMER (TB3 & TB6) (cont.)

FIG. 19-1 BREW/DILUTION TIMER TRIACS

Triacs:

TH-1/MV-1 Brew solenoid

TH-2/MV-2 Dilution solenoid

Page 19	41722 070209

SERVICE (cont.)

DIGITAL BREW TIMER (TB3Q & TB6Q)

FIG. 20-1 DIGITAL TIMER

Location:

The timer is located in left side of the hood.

Test Procedure

NOTE: Do not remove or install wires while timer board is installed. Pressure applied to one side may cause damage to the board.

1.Disconnect the brewer from the power source and remove the top cover.

2.With a voltmeter, check the supply voltage across terminals TL1 and TL2. Connect the brewer to the power source. Turn on the "ON/OFF" switch. The voltage must be:

a)120 volts ac for two wire 120 volt models.

b)200 to 230 volts ac on two wire 200 volt or 230 volt models.

3.Disconnect the brewer from the power source.

If voltage is present as described, proceed to #4.

If voltage is not present as described, refer to the Wiring Diagrams and check the wiring harness.

4.With a voltmeter, check the output voltage across terminals TL1 and TL4. Connect the brewer to the power source, turn on the "ON/OFF" switch and press the "START" switch. The voltage must be:

a)120 volts ac for two wire 120 volt models.

b)200 to 230 volts ac for two wire 200 volt or 230

volt models.

If voltage is present as described, the timer is operating properly. If voltage is not present as described, proceed to #5.

5.With a voltmeter, check the input start voltage across terminals TL2 and TL5. Connect the brewer

to the power source, turn on the "ON/OFF" switch and press the "START" switch. The indication must be as follows:

a)120 volts ac for two wire 120 volt models.

b)200 to 230 volts ac on two wire 200 volt or 230 volt models.

If voltage is not present as described, refer to the Wiring Diagrams and check the wiring harness to the start switch.

If start voltage is present as described (but no output voltage), replace the timer.

Removal and Replacement:

1.Remove the two #6-32 screws, lock washers and spacers securing timer to bracket.

2.Disconnect all wires from the timer.

3.Refer to schematic and reconnect wires.

4.Install new timer to bracket with the two #6-32 screws, lock washers and spacers.

5.Adjust the timer as required.

	TRM-1
	TRM-2
SW1	TRM-3
J-2	TRM-4
J-1	TRM-5

FIG. 20-2 DIGITAL TIMER

Terminals:

J-2 ½ batch connector

J-1 Multi batch (NOT USED IN TB SERIES) SW-1 Programming Enable/Disable

TRM-1 White/Violet		L1 from ON/OFF switch
TRM-2	White (Red)	Neutral (L2)
TRM-3	White/Orange	Start switch
TRM-4	White/Green	Brew solenoid
TRM-5	White/Yellow	Start switch

Page 20	41722 070209

SERVICE (cont.)

DIGITAL BREW TIMER (TB3Q & TB6Q) (cont.)

FIG. 21-1 DIGITAL TIMER TRIACS

Triacs:

Q-1/MV-2

Brew solenoid output

MV-1

Line in

Page 21	41722 070209

SCHEMATIC WIRING DIAGRAM TB3Q

			(OPTIONAL)
			READY INDICATOR		GREEN
		BLU/BLK		BLK
						N
L1	LIMIT
		SW. & THERMOSTAT
	THERMOSTAT
				BLK	TANK HEATER	WHI
	BLK
	BLU/BLK
	WHI					WHI
	SW1			"KEEP WARM HEATER"		WHI
	BLK		WHI/VIO	SOL		WHI
		1	WHI/VIO			SW2
			WHI
	BREW	2
			WHI/ORA
	TIMER	3	WHI/GRN
		4	WHI/YEL
		5

120 VOLTS AC
2 WIRE
SINGLE PHASE	37234.0001A 08/04 © 2004 BUNN-O-MATIC CORPORATION

SCHEMATIC WIRING DIAGRAM

TB3QA

L1				GRN/YEL
	LIMIT	SW. &		L2
			THERMAL	THERMAL
		THERMOSTAT
	THERMOSTAT		FUSE	FUSE
BLK	BLU/BLK		BLK	RED
WHI			TANK HEATER	WHI
	SW1
		"KEEP WARM" HEATER		RED

					WHI/VIO
					RED
BLK	WHI/VIO	SOL	WHI/GRN	BREW	WHI/ORN
				TIMER	WHI/GRN
						SW2
					WHI/YEL

230 VOLTS AC

2 WIRE

SINGLE PHASE 37234.0003A 11/04 © 2004 BUNN-O-MATIC CORPORATION

Page 22	41722 070209

SCHEMATIC WIRING DIAGRAM TB3, TB3B, TB3-LP

	L1					Earth Ground				N
					GRN
		LIMIT							SWITCH &
									THERMOSTAT
	THERMOSTAT			Chassis Ground
			BLU/BLK						BLK	WHI
	BLK
										TANK HEATER
	WHI									WHI
	ON/OFF SWITCH		"KEEP WARM" HEATER							WHI
	BLK		BREW/DILUTION
					TIMER
			6	5	4	3	2	1		WHI
	WHI/VIO
		DILUTION							OPTIONAL
	WHI/VIO	SOL	WHI/BLU						READY
									INDICATOR
		BREW						BLU/BLK	BLK
	WHI/VIO		WHI/GRN						START
		SOL
							WHI/ORN		SWITCH
							WHI/YEL

	100 VOLTS AC
	120 VOLTS AC
	2 WIRE + GND	37234.0007A 02/08 © 2008 BUNN-O-MATIC CORPORATION
	SINGLE PHASE

Page 23	41722 070209

SCHEMATIC WIRING DIAGRAM

TB3B W/HALF-BATCH

L1							Earth Ground				N
						GRN
	LIMIT									SWITCH &
										THERMOSTAT
THERMOSTAT					Chassis Ground
										BLK	WHI
BLK		BLU/BLK
											TANK HEATER
WHI											WHI
		HALF/OFF/FULL SWITCH									"KEEP WARM" HEATER
BLK
SW1A		SW1B			SW1C				SW1D
WHI/VIO		½ BATCH
			J1	BREW/DILUTION
		PNK	1
		GRY	3			TIMER
				6	5	4	3	2	1		WHI
WHI/VIO
	DILUTION									OPTIONAL
WHI/VIO	SOL	WHI/BLU								READY
										INDICATOR

BREW

WHI/VIO

WHI/GRN

BLU/BLK

BLK

SOL

START

WHI/ORN

SWITCH

100 VOLTS AC

WHI/YEL

120 VOLTS AC

2 WIRE + GND

SINGLE PHASE

37234.0008B 10/08 © 2008 BUNN-O-MATIC CORPORATION

SCHEMATIC WIRING DIAGRAM TB3Q

				POWER CORD	GRN
L1	LIMIT		Earth Ground	SWITCH &	Chassis Ground	N
	THERMOSTAT			THERMOSTAT	BLU	WHI
	BLK		BLU/BLK		BLK
	WHI				TANK HEATER	WHI
	BLK	SW1	"KEEP WARM HEATER"	BLU/BLK		WHI
					BLK
			WHI/VIO			WHI
			SOL		OPTIONAL
					READY
		1	WHI/VIO		INDICATOR
			WHI
	BREW	2
			WHI/ORA
	TIMER	3	WHI/GRN
		4	WHI/YEL	START SWITCH
		5

120 VOLTS AC

2 WIRE

SINGLE PHASE

37234.0009B 06/08 © 2008 BUNN-O-MATIC CORPORATION

Page 24	41722 070209

SCHEMATIC WIRING DIAGRAM TB3Q W/SWEETENER & EMPTY BAG DETECT

L1								GREEN		N
LIMIT			THERMOSTAT
THERMOSTAT						TANK HEATER
BLK	BLU/BLK				BLK					WHI
WHI						"KEEP WARM" HEATER				WHI
						LOW PRESSURE
						SWITCH
				WHI/VIO		COM.	N.O.	BLU		WHI
								RELAY
UNSWEET/OFF/SWEET		WHI			WHI/VIO		BLK		2	WHI
					SOLD OUT INDICATOR				7
		WHI/VIO						5
BLK
				WHI/VIO					START
			1
				WHI/BLK
		BREW	2	WHI/ORA
			3
		TIMER		WHI/GRN
			4
				WHI/YEL
			5
	BRN/WHI		SOL	WHI/VIO		SOL	WHI/GRN
			SWTNR
						SOL

WHI/BLU	120 VOLTS AC
	2 WIRE
37234.0010A 04/08 © 2008 BUNN-O-MATIC CORPORATION	SINGLE PHASE

SCHEMATIC WIRING DIAGRAM TB3A

			OPTIONAL							Earth Ground
			READY
			INDICATOR							GRN
			BLU		BLK
L1			SWITCH &								N
	LIMIT							THERMAL	Chassis Ground		THERMAL
			THERMOSTAT
								FUSE			FUSE
THERMOSTAT
BLK		BLU/BLK					BLK				RED
										TANK HEATER
WHI											WHI
	ON/OFF SWITCH		"KEEP WARM" HEATER								RED
BLK
			BREW/DILUTION
					TIMER
			6	5	4	3	2	1
WHI/VIO	DILUTION
								RED			RED
WHI/VIO		SOL	WHI/BLU								START
		2
WHI/VIO	SOL	WHI/GRN						WHI/ORN			SWITCH
	1							WHI/YEL
	BREW

230 VOLTS AC

2 WIRE

SINGLE PHASE

37234.0011A 10/08 © 2008 BUNN-O-MATIC CORPORATION

Page 25	41722 070209

SCHEMATIC WIRING DIAGRAM TB6

			OPTIONAL			GRN
			READY INDICATOR		Chassis Ground		Earth Ground
			BLU	BLK
L1	LIMIT		SW. &				N
			THERMOSTAT
THERMOSTAT
					BLK
BLK		BLU/BLK					WHI
WHI						TANK HEATER	WHI
				"KEEP WARM" HEATER
BLK		LEFT/OFF/RIGHT SWITCH				START SWITCH
SW1A		SW1B	SW1C	SW1D		SW2A
			BRN/BLK		YEL
	1	WHI/VIO
	2	WHI					WHI
	3	WHI/ORN
TIMER	4	WHI/GRN		SOL
	5	WHI/YEL		BREW
	6	WHI/BLU
					YEL
			SOL	SOL
120 VOLTS A C			LEFT	RIGHT
			DILUTION
2 WIRE
SINGLE PHASE			41974.0000A 03/09 © 2009 BUNN-O-MATIC CORPORATION

Page 26	41722 070209

SCHEMATIC WIRING DIAGRAM TB6Q

			OPTIONAL			GRN
			READY INDICATOR		Chassis Ground		Earth Ground
			BLU	BLK
L1	LIMIT		SW. &				N
			THERMOSTAT
THERMOSTAT
					BLK
BLK		BLU/BLK					WHI
WHI						TANK HEATER	WHI
				"KEEP WARM" HEATER
BLK		LEFT/OFF/RIGHT SWITCH				START SWITCH
SW1A		SW1B	SW1C	SW1D		SW2A
			BRN/BLK		YEL
	1	WHI/VIO
	2	WHI					WHI
	3	WHI/ORN
TIMER	4	WHI/GRN		SOL
	5	WHI/YEL		BREW
			SOL	SOL	YEL
120 VOLTS A C			LEFT	RIGHT
			DILUTION
2 WIRE
SINGLE PHASE			41975.0000A 03/09 © 2009 BUNN-O-MATIC CORPORATION

Page 27	41722 070209