Bunn Single TF User Manual

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OPERATING & SERVICE MANUAL

BUNN-O-MATIC CORPORATION

POST OFFICE BOX 3227

SPRINGFIELD, ILLINOIS 62708-3227

PHONE: [phone] FAX: [phone]

27118.0000C 10/00 ©1996 Bunn-O-Matic Corporation

INTRODUCTION

This equipment will brew a half-gallon, gallon, or gallon and a three fourths batch of coffee into an awaiting server at the push of a button and includes a hot water faucet for allied beverage use. The brewer is specifically designed for use with a BUNN® .5 gallon and 1.75 gallon server. It is only for indoor use on a sturdy counter or shelf.

WARRANTY

Bunn-O-Matic Corp. (“Bunn”) warrants the equipment manufactured by it to be commercially free from defects in material and workmanship existing at the time of manufacture and appearing within one year from the date of installation. In addition:

1.) Bunn warrants electronic circuit and/or control boards to be commercially free from defects in material and workmanship for two years from the date of installation.

2.) Bunn warrants the compressor on refrigeration equipment to be commercially free from defects in material and workmanship for two years from the date of installation.

3.) Bunn warrants that the grinding burrs on coffee grinding equipment will grind coffee to meet original factory screen sieve analysis for three years from date of installation or for 30,000 pounds of coffee, whichever comes first.

This warranty does not apply to any equipment, component or part that was not manufactured by Bunn or that, in Bunn’s judgement, has been affected by misuse, neglect, alteration, improper installation or operation, improper maintenance or repair, damage or casualty.

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.

The Buyer shall give 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. If requested by Bunn, the Buyer shall ship the defective equipment prepaid to an authorized Bunn service location. If Bunn determines, in its sole discretion, that the equipment does not conform to the warranty, Bunn shall repair the equipment with no charge for parts during the warranty period and no charge for labor by a Bunn Authorized Service Representative during the warranty period. If Bunn determines that repair is not feasible, Bunn shall, at its sole option, 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, AS SPECIFIED HEREIN, TO REPAIR OR, AT BUNN’S SOLE OPTION, 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.

Page 2	27118 100400

USER NOTICES

The notices on this brewer should be kept in good condition. Replace unreadable or damaged labels.

		NL
! WARNING	HOT WATER	L
		00831.0000
ELECTRICAL REQUIREMENTS
CAUTION - The brewer must be disconnected from the power source until

Requires 2-wire, grounded service rated 120 volts ac, 20 amp, single phase, 60 Hz.

Requires 3-wire, grounded ser-

vice rated 120/208 volts or 120/240 ac, volts ac, 20 amp, single phase, 60 20

Hz.

Page 3

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 front panel beneath the sprayhead.

Models with electronic control assemblies:

Place the tank heater switch at the top of the control assembly in the “OFF” position.

Models with electro/mechanical thermostats:

Rotate the control thermostat knob fully counterclockwise to the “OFF” position.

4.Feed the cord through the strain relief and connect it to the terminal block.

5.Connect the brewer to the power source and verify the voltage at the terminal block before proceeding. Replace the front panel.

6.If plumbing is to be hooked-up later be sure the brewer is disconnected from the power source. If plumbing has been hooked-up, the brewer is ready for Initial Set-Up.

PLUMBING REQUIREMENTS

This brewer must be connected to a cold water system with operating pressure between 20 and 90 psi (138 and 620 kPa) from a 1⁄2" or larger supply line. A shut-off valve should be installed in the line before the brewer. 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 1⁄4" flare.

NOTE – Bunn-O-Matic recommends 1⁄4" copper tubing for installations of less than 25 feet and 3⁄8" for more than 25 feet from the 1⁄2" water supply line. A tight coil of copper tubing in the water line will facilitate moving the brewer to clean the countertop. Bunn-O-Matic does not recommend the use of a saddle valve to install the brewer. The size and shape of the hole made in the supply line by this type of device may restrict water flow.

This equipment must be installed to comply with the Basic Plumbing Code of the Building Officials and Code Administrators International, Inc. (BOCA)

and the Food Service Sanitation Manual of the Food and Drug Administration (FDA).

Plumbing Hook-Up

1.Attach the quickconnect fitting from the tubing (supplied) to the water inlet fitting on the bottom of the brewer.

2.Flush the water line and securely attach it to the flare fitting on the tubing (supplied).

3.Turn on the water supply.

Page 4	27118 100400

INITIAL SET-UP

CAUTION – The brewer must be disconnected from the power source throughout the initial set-up, except when specified in the instructions.

NOTE: ECA Models Only - This brewer is equipped with a temperature sensor that indicates when to brew and, when selected, locks-out the start of a brew cycle until the water has heated to the optimum brewing temperature.

1.Remove the front panel beneath the sprayhead.

Models with electronic control assemblies:

Place the tank heater switch at the top of the control assembly in the “OFF” position.

Models with electro/mechanical thermostats:

Rotate the control thermostat knob fully counterclockwise to the “OFF” position.

2.Connect the brewer to the power source. Water will begin flowing into the tank.

3.When water stops flowing into the tank, remove the front panel and proceed as directed:

Models with electronic control assemblies:

Place the tank heater switch at the top of the control assembly in the “ON” position and replace the front panel.

Models with electro/mechanical thermostats:

Rotate the control thermostat knob fully clockwise to the “ON” position and replace the front panel.

4.Wait approximately twenty-five minutes on 208V, 240V Models or fifty minutes on 120V Models for the water in the tank to heat to the proper temperature.

5.Place an empty server beneath the brew station. Place the Selector switch in the desired position, the On/Off switch in the upper position and initiate a brew cycle

6.Place the On/Off switch in the lower “OFF” position after water has stopped flowing from the funnel, and check the water volume in the server. It should be 64 oz -1/2 gallon, 128 oz - 1 gallon or 224 oz - 1-3/4 gallon. NOTE: Brewer will not operate if the server size does not match the selected batch size.

7.(A) If not, disconnect the brewer from the power source, remove the front panel, and adjust the timer as required. Refer to Adjusting Brew Volumes. Replace the front panel, connect the brewer to the power source, allow the water to reheat, start, and measure another brew cycle.

(B) If necessary adjust the needle valve to achieve water volume to be bypassed around the coffee filter in the funnel.

NOTE: To increase the water bypass turn the needle valve counterclockwise, to decrease the water bypass turn the needle valve clockwise. An adjustment to the needle valve will require a timer adjustment for volume.

8.Repeat step 7 until the proper water volume is achieved.

9.The brewer is now ready for use in accordance with the coffee brewing instructions.

Page 5	27118 100400

ADJUSTING BREW VOLUMES

CAUTION - Disconnect the power source from the brewer prior to the removal of any panel for the replacement or adjustment of any component.

NOTE: Prior to setting or modifying batch sizes, check that the brewer is connected to water supply, the tank is properly filled, and a funnel and server are in place.

1.Modifying batch sizes. To modify a batch volume, first check that the SET/LOCK switch is in the “SET” position on the circuit board.

To increase a batch size. Press and hold the START or BREW switch until three clicks are heard. Release the switch (Failure to release the switch within two seconds after the third click causes the volume setting to be aborted and previous volume setting will remain in memory) and press it again one or more times. Each time the switch is pressed, two seconds are added to the brew time period. Allow the brew cycle to finish in order to verify that the desired volume has been achieved.

To decrease a batch size. Press and release the START or BREW switch once for every two-second interval to be removed from the total brew time period; then immediately press and hold down the START or BREW switch until three clicks are heard. Release the switch. (Failure to release the switch within two seconds after the third click causes the volume setting to be aborted and previous volume setting will remain in memory). Allow the brew cycle to finish in order to verify that the desired volume has been achieved.

2.Setting batch sizes. To set a batch volume, first check that the SET/LOCK switch is in the “SET” position on

the circuit board. Press and hold the START or BREW switch until three distinct clicks are heard, and then release the switch. (Failure to release the switch within two seconds after the third click causes the volume setting to be aborted and previous volume setting will remain in memory). View the level of the liquid being dispensed. When the desired level is reached, turn the ON/OFF switch to “OFF” (lower). The brewer remembers this volume and will continue to brew batches of this size until the volume setting procedure is repeated.

NOTE: When brewing coffee, batch volumes will decrease due to absorption by the coffee grounds.

3.Setting programming disable feature. If it becomes necessary to prevent anyone from changing brew times once programmed, you can set the SET/LOCK switch to the “LOCK” position. This will prevent any programming to be done until switch is once again placed in the “SET” position.

Page 6	27118 100400

OPERATING CONTROLS

BREW SELECTOR SWITCH

Placing the switch in the 1⁄2 Gal, 1 Gal, or 13⁄4 Gal position selects the amount of coffee to be brewed in subsequent brew cycles. Repositioning this switch after a brew cycle has been initiated does not change the brew batch in progress.

ON/OFF SWITCH

Placing the switch in the unlighted lower position cuts power to the server sensor and stops brewing. Stopping a brew cycle after it has been started will not stop the flow of water from the funnel. Placing the switch in the lighted upper position supplies power to the server sensor and enables the brew circuit.

START SWITCH

Momentarily pressing and releasing this switch starts a brew cycle when the On/Off switch is in the lighted upper position.

NOTE: The On/Off switch must be in the lighted upper position to initiate and complete a brew cycle.

COFFEE BREWING

1.Select the desired batch size.

2.Insert a BUNN® filter into the funnel.

3.Pour the proper amount of fresh coffee into the filter and level the bed of grounds by gently shaking.

4.Slide the funnel into the funnel rails.

5.Place an empty server under the funnel. Make sure server size agrees with batch selection.

6Place the On/Off switch in the lighted upper position. Momentarily press and release the start switch.

7. When brewing is completed, simply discard the grounds and filter.

CLEANING

1.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.

2.Check and clean the sprayhead. The sprayhead holes must always remain open.

NOTE – In hard water areas, this may need to be done daily. It will help prevent liming problems in the brewer and takes less than a minute.

Page 7	27118 100400

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 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.

•Disconnect power source when servicing, except when electrical tests are specified.

•Follow recommended service procedures.

•Replace all protective shields or safety notices.

Problem	Probable Cause	Remedy
Equipment will not operate. Brew	1. No power or incorrect voltage	(A1) Check the terminal block for
cycle will not start.		120 volts across the black and white
		terminals on 120 volt two wire brew-
		ers.
		(A2) Check the terminal block for
		120 volts across the red and white
		terminals and the black and white
		terminals on 120/208 or 120/240
		volt brewers.
		(A3) Check the terminal block for
		200 volts on "B Series" brewers or
		240 volts on "A Series" brewers
		across the red and black terminals.
		(B) Check circuit breakers or fuses.
Brew cycle will not start.	1. Server	Make sure server size agrees with
		batch selection.
	2. No water	Check plumbing and shut-off valves

Page 8	27118 100400

TROUBLESHOOTING (cont.)
Problem	Probable Cause		Remedy
Brew cycle will not start (cont.)	3. Water strainer/flow control (.500		(A) Direction of flow arrow must be
	GPM)		pointing towards brewer.
			(B) Remove the strainer/flow con-
			trol and check for obstructions. Clear
			or replace.
	4.	ON/OFF switch	Refer to Service - ON/OFF switch for
			testing procedures. See page 31
	5.	Start switch	Refer to Service - Start switch for
			testing procedures. See page 35
	6.	Timer	Refer to Service - Timer for testing
			procedures. See page 38 or 40
	7.	Dispense Valve	Refer to Service - Dispense valve for
			testing procedures. See page 22
	8.	Control Assembly (Electronic)	Refer to Service - Electronic con-
			trols for testing procedures. See
			pages 23 thru 27
	9.	Brew selector switch	Refer to Service - Brew selector
			switch for testing procedures. See
			page 16
	10. Server sensor		Refer to Service - Server sensor for
			testing procedures. See page 33
Automatic refill will not operate	1. No water		Check plumbing and shut-off valves.
	2. Water strainer/flow control (.500		(A) Direction of flow arrow must be
	GPM)		pointing towards brewer.

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

Page 9	27118 100400

TROUBLESHOOTING (cont.)
Problem	Probable Cause	Remedy
Automatic refill will not operate	3. Overflow protection switch	Refer to Service - Overflow protec-
(cont.)		tion switch for testing procedures.
		See page 32
	4. (A) Level control board & level	Refer to Service - Level control board
	probe. (Electro/mechanical)	for testing procedures. See page 28
	(B) Control Assembly (Electronic)	Refer to Service - Electronic con-
		trols for testing procedures. See page
		23 thru 27
	5. Solenoid Valve	Refer to Service - Solenoid valve for
		testing procedures. See page 34
Beverage level will not adjust (Selec-	1. Selector switch	Refer to Service - Selector switch for
tor switch in any position)		testing procedures. See page 16
Water flows into tank continuously	1. Timer	Refer to Service - Timer for testing
(ON/OFF Switch "ON")		procedures. See page 38 or 40
Water flows into tank continuously	1. (A) Level control board and level	Refer to Service - Level control board
(ON/OFF Switch "OFF")	probe (Electro/mechanical)	for test procedures. See page 28
	(B) Control assembly (Electronic)	Refer to Service - Control assembly
		for testing procedures. See page 23
		thru 27
	2. Overflow protection switch	Refer to Service - Overflow protec-
		tion switch for testing procedures.
		See page 32
	3. Solenoid Valve	Refer to Service - Solenoid valve for
		testing procedures. See page 34
Water from tank is not hot	1. Limit thermostat	Refer to Service -Limit thermostat
	CAUTION - Do not eliminate or by-	for testing procedures. See page 30
	pass limit thermostat. Use only
	B.O.M. part #23717.0001

Page 10	27118 100400

TROUBLESHOOTING (cont.)
Problem	Probable Cause	Remedy
Water from tank is not hot (cont.)	2. (A) Control Thermostat (Electro/	Refer to Service - Control thermo-
	mechanical)	stat for testing procedures. See page
		20
	(B) Control assembly (Electronic)	Refer to Service - Control assembly
		for testing procedure. See page 23
		thru 27
	3. Contactor (Electro/mechanical)	Refer to Service - Contactor for test
		procedures. See page 18
	4. Tank heater	Refer to Service - Tank heater for
		testing procedures. See page 36
	5. Triac assembly (Electronic)	Refer to Service - Triac assembly for
		removal and replacement.See page
		27
Spitting or unusual steaming from	1. (A) Control thermostat (Electro/	Refer to Service - Control thermo-
sprayhead or airvent.	mechanical)	stat for testing procedures. See page
		20
	(B) Control assembly (Electronic)	Refer to Service - Control assembly
		for testing procedures. See page 23
		thru 27

2.Triac assembly (Electronic)

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.

Refer to Service - Triac assembly for testing procedures. See page 27

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

Page 11	27118 100400

TROUBLESHOOTING (cont.)
Problem	Probable Cause	Remedy
Inconsistent beverage level in server.	1. Strainer/flow control (.500 GPM)	(A) Direction of flow arrow must be
		pointing towards the brewer.
		(B) Remove the strainer/flow con-
		trol and check for obstructions. Clear
		or replace.
	2. Improper water pressure	Check the operating water pressure
		to the brewer. It must be between 20
		and 90 psi (138 and 620 kPa)

	3.	Dispense valve
Consistently high or low beverage	1.	Timer adjustment
level in server.
Dripping from sprayhead.	1.	Dispense valve
Water overflows filter.	1.	Bypass valve
	2.	Type of paper filters
	3.	No sprayhead
Beverage overflows server.	1.	Beverage left in server
	2.	Timer adjustment

3. Dispense valve

Refer to Service - Dispense valve for testing procedures. See page 22

Adjust the timer as required to achieve the recommended volume for each brew cycle.

Refer to Service - Dispense valve for testing procedures. See page 22

Refer to Adjustments on page 5 step #7. For test procedures see page 15

BUNN® paper filters should be used for proper extraction.

Check sprayhead

The brew cycle should be started only with an empty server under the funnel.

Adjust the timer as required to achieve the recommended 224 oz for each 1-3/4 gallon brew cycle.

Refer to Service - Timer for testing procedures. See page 38 or 40

Refer to Service - Dispense valve for testing procedures. See page 22

Page 12	27118 100400

TROUBLESHOOTING (cont.)
Problem	Probable Cause	Remedy
Weak beverage	1. Type of paper filters	BUNN® paper filters should be used
		for proper extraction.
	2. Coffee	A sufficient quantity of fresh drip or
		regular grind should be used for
		proper extraction.
	3. Sprayhead	B.O.M. sprayhead #01082.0002
		should be used to properly wet the
		bed of ground coffee in the funnel.
	4. Funnel loading	The BUNN® paper filter should be
		centered in the funnel and the bed of
		ground coffee leveled by gentle shak-
		ing.
	5. Water temperature	Empty the server, remove its cover.
		Place empty funnel over the server
		entrance, with ON/OFF switch in the
		"ON" position press the start switch
		and release it. Check the water tem-
		perature immediately below the
		sprayhead with a thermometer. The
		reading should not be less than 195°
		F.
Brewer is making unusual noises.	1. Solenoid (Inlet)	The nut on back of the solenoid must
		be tight or it will vibrate during op-
		eration
	2. Plumbing lines	Plumbing lines should not be rest-
		ing on the counter top.
	3. Water supply	(A) The brewer must be connected
		to a cold water line.
		(B) Water pressure to the brewer
		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).
	4. Tank heater	Remove and clean lime off the tank
		heater.
	5. Contactor	Check for low voltage.
	Page 13	27118 100400

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 warmer base plate.

The top cover is attached with one #4-40 slotted head screw.

The front inspection panel is attached with four #6- 32 slotted head screws.

The server plateform is attached with seven #6-32 slotted head screws.

			CEDU	RES
		PRO
OPER	ATING

	UTION
!	CA

P1014

Contents
Brewer Selector Switch.........................................	16
Bypass Valve ........................................................	15
Contactor Assembly..............................................	18
Control Thermostat ...............................................	20
Dispense Valve .....................................................	22
Electronic Control ....................................	23 thru 27
Level Control Board and Level Probe ....................	28
Limit Thermostat ..................................................	30
ON/OFF Switch......................................................	31
Overflow Protection Switch ..................................	32
Proximity Sensor ..................................................	33
Solenoid (Inlet) .....................................................	34
Start Switch (Brew) ..............................................	35
Tank Heater ..........................................................	36
Timer ...............................................................	38,40
Wiring Diagrams ......................................	42 thru 45

Page 14	27118 100400