Bunn CWT TWIN, CWTF TWIN, CWTF TWIN-APS User Manual

CWT TWIN

CWTF TWIN

CWTF TWIN-APS

INTRODUCTION

This equipment will brew one or two half-gallon batches of coffee simultaneously into awaiting dispensers
(with just the press of a button). One side may include a hot water faucet for allied beverage use. It is only for
indoor use on a sturdy counter.

BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY

Bunn-O-Matic Corp. (“BUNN”) warrants equipment manufactured by it as follows:

1) All equipment other than as specifi ed 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 fi rst.

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 Offi ce Box 3227, Springfi eld, 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 modifi cations 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 specifi ed 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 profi ts, 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

10737 082903

USER NOTICES

Carefully read and follow all notices in this manual and on the equipment. All labels on the equipment should

be kept in good condition. Replace any unreadable or damaged labels.

#12364.0000

Page 3

ELECTRICAL REQUIREMENTS

WARNING - The brewer must be disconnected from the power source until specifi ed in Initial Set-Up.

Refer to Data Plate on the Brewer, and local/national electrical codes to determine circuit requirements.

RED

L2

WHI

N

BLK

L1

GREEN GREEN

120V. A.C.

208 or 240V. A.C.

120V. A.C.

P1843

120/208 & 120/240V ac

single phase models

Note: This electrical service

consists of 3 current carrying

conductors (Neutral, L1 and

L2) and a separate conductor

for earth ground.

Some 4/2 & 0/6 models

require two individual branch

circuits.

BLU

L3

RED

L2

BLK

L1

GREEN GREEN

230V. A.C.

230V. A.C.

230V. A.C.

P1843

230V ac

3 phase models

Note: This electrical service
consists of 3 current carry­ing conductors (L1, L2 and
L3) and a separate conduc-

tor for earth ground.

BLK

L1

RED

L2

GREEN GREEN

200 or 230V. A.C.

P1842

200 or 230V ac

single phase models

Note: This electrical service
consists of 2 current carry­ing conductors (L1 and L2)

and a separate conductor

for earth ground.

ELECTRICAL HOOK-UP
CAUTION – Improper electrical installation will damage electronic components.

1. An electrician must provide electrical service as specifi ed.

2. Using a voltmeter, check the voltage and color coding of each conductor at the electrical source.

3. Place the heater switchs at the rear of the brewer in the "OFF" lower position.

4. Remove the front panel beneath the sprayheads.

5. Feed the cord through the strain relief(s) and connect it to the terminal block(s).

6. Connect the brewer to the power source and verify the voltage at the terminal block before proceeding. Re-

place the front panel.

7. 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.

Page 4

10737 081706

PLUMBING REQUIREMENTS

These brewers 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 fi tting is

3

⁄8" fl are.

NOTE - Bunn-O-Matic recommends

3

⁄8" copper tubing 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 fl ow.

This equipment must be installed to comply with the Basic Plumbing Code of the Building
Offi cials and Code Administrators International, Inc. (BOCA) and the Food Service Sanitation
Manual of the Food and Drug Administration (FDA). For models installed outside the U.S.A.,
you must comply with the applicable Plumbing/Sanitation codes for your area.

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P1241

Models CWT & CWTF

1. Remove cap from the fl ared fi tting on the bottom
of the center tube assembly.

2. Flush the water line and securely attach it to the
fl are fi tting on the center tube assembly.

3. Turn on the water supply.

4. On models with faucet place an empty vessel
beneath the faucet and lift the handle until water
is dispensed.

Page 5

10737 081706

INITIAL SET-UP

CAUTION - The brewer must be disconnected from the power source throughout the initial set-up, except

when specifi ed in the instructions.

1. Insert an empty funnel into the funnel rails.

2. Place an empty dispenser under the funnel.

3. Place the heater switch at the rear of the brewer in the "OFF" lower position.

4. Connect the brewer to the power source, place the "ON/OFF" switch in the "ON" upper position, and momentarily
press and release the start switch. Water will begin fl owing into the tank. When water stops fl owing into
the tank, initiate a second and a third brew cycle. During the third brew cycle the tank will fi ll to its capacity
and the excess will fl ow from the sprayhead, out of the funnel, and into the dispenser.

5. When the fl ow of water from the funnel stops, place the heater switch at the rear of the brewer in the "ON"
upper position and wait approximately twenty minutes for the water in the tank to heat to the proper tempera­ture. Some water will drip from the funnel during this time; this is due to expansion and should not occur
thereafter.

6. Empty the dispenser, place the "ON/OFF" switch in the "ON" upper position, and momentarily press and release
the start switch.

7. Place the "ON/OFF" switch in the lower "OFF" position after water has stopped fl owing from the funnel, and
let the water in the tank reheat to the proper temperature.

8. Empty the dispenser, place the "ON/OFF" switch in the "ON" upper position, and momentarily press and release
the start switch. Check the water volume in the dispenser after water has stopped fl owing from the funnel.
It should be 64 ounces.

9. If not, adjust the timer as required. Refer to Adjusting Brew Volumes.

10. Repeat steps 8 & 9 until 64 oz water volume is achieved.

NOTE: Repeat steps 1 through 10 for the other side.

11. The brewer is now ready for use in accordance with the coffee brewing instructions on the next page.

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 fi lled, and a funnel and server are in place.

1. Modifying batch sizes. To modify a batch volume, fi rst check that the SET/LOCK switch is in the "SET" posi-

tion 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 fi nish 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 fi nish in order to verify that the desired volume has been achieved.

Page 6

10737 100801

ADJUSTING BREW VOLUMES (Cont.)

2. Setting batch sizes. To set a batch volume, fi rst 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.

OPERATING CONTROLS

ON/OFF SWITCH

Placing the "ON/OFF" switch in the "OFF" lower position stops brewing. Stopping a brew cycle after it has
been started will not stop the fl ow of water into the funnel until the tank syphons down to its proper level. Plac­ing the switch in the "ON" upper position enables the brew circuit and on all except APS models, supplies power
to the brew station warmer.

START SWITCH

Momentarily pressing and releasing the switch starts a brew cycle when the "ON/OFF" switch is in the "ON"
upper position.

NOTE – The "ON/OFF" switch must be in the "ON" upper position to initiate and complete a brew cycle.

COFFEE BREWING

1. Insert a BUNN® fi lter into the funnel.

2. Pour the fresh coffee into the fi lter and level the bed of grounds by gently shaking.

3. Slide the funnel into the funnel rails.

4. Place an empty dispenser beneath the funnel.

5. Place the "ON/OFF" switch in the "ON" upper position. Momentarily press and release the start switch.

6. When brewing is completed, simply discard the grounds and fi lter.

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.

3. With the sprayhead removed, insert the deliming spring (provided) all the way into the sprayhead tube.

When inserted properly, no more than two inches of spring should be visible. Saw back and forth fi ve or six

times.

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

10737 100801

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 qualifi ed 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 fi ttings 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 specifi ed.

• Follow recommended service procedures

• Replace all protective shields or safety notices

PROBLEM

Brew cycle will not start

PROBABLE CAUSE

1. No water

2. No power or incorrect voltage
to the brewer

REMEDY

Water lines and valves to the
brewer must be open.

(A1) Check the terminal block for
120 volts across the red and white
terminals and the black and white
terminal on three wire 120/240
volt brewers.
(A2) Check the terminal block for
200 volts ac across the red and
black terminals for two wire 200
volts on "B Series" brewers.
(A3) Check the terminal block for
230 volts ac across the red and
black terminals on three wire 230
volts "A Series" brewers or 240
volts ac on two wire 240 volt "A
Series" brewers.

Page 8

(B) Check circuit breakers or
fuses.

10737 061597

TROUBLESHOOTING (cont.)

PROBLEM

Brew cycle will not start (cont.)

PROBABLE CAUSE

3. ON/OFF Switch

4. Start Switch

5. Timer

6. Solenoid Valve

7. Water strainer/flow control
(.222 GPM)

REMEDY

Refer to Service - ON/OFF Switch
for testing. See page 16

Refer to Service - Start Switch for
testing procedures. See page 20

Refer to Service - Timer for testing
procedures. See page 24 or 25

Refer to Service - Solenoid Valve
for testing procedures. See page
19

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

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

Water is not hot

1. Tank Heater Switch

2. Limit Thermostat

CAUTION - Do not eliminate or

bypass limit thermostat. Use only
BOM part #29329.1000

3. Control Thermostat

4. Tank Heater

5. Recovery Booster (CWT 2/2,
CWTF 2/2 & 0/6 Only)

Refer to Service - Tank Heater
Switch for testing procedures.
See page 22

Refer to Service - Limit Thermo­stat for testing procedures. See
page 16

Refer to Service - Control Ther­mostat for testing procedures.
See page 15

Refer to Service - Tank Heater for
testing procedures. See page 21

Refer to Service - Recovery
Booster for testing procedures.
See page 18

Page 9

10737 120800

TROUBLESHOOTING (cont.)

PROBLEM

Inconsistent beverage level in
dispenser

PROBABLE CAUSE

1. Strainer/flow control (.222
GPM)

2. Syphon System

3. Lime Build-up

CAUTION - Tank and tank compo-

nents 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.

REMEDY

(A) Direction of fl ow 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.

Consistently low beverage level in
the dispenser

Spitting or excessive steaming

4. Water Pressure

1. Timer

2. Strainer/fl ow Control (.222
GPM)

1. Lime Build-up

CAUTION - Tank and tank compo-

nents 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.

The water pressure to the brewer
must be at least 20 psi (138
kPa).

(A) Early Models - Timer dial must
indicate at least two minutes and
fi fteen seconds.

(B) Late Models - Refer to Service

- Digital Timer for testing proce­dures. See page 25

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

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

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

Page 10

10737 120800

TROUBLESHOOTING (cont.)
PROBLEM

Spitting or excessive steaming
(cont.)

Dripping from sprayhead

Water fl ows into tank continuously
(ON/OFF Switch "ON")

Water fl ows into tank continuously
(ON/OFF Switch "OFF")

Beverage overfl ows dispenser

PROBABLE CAUSE

2. Control Thermostat

1. Syphon System

2. Lime Build-up

CAUTION - Tank and tank compo-

nents 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

REMEDY

Refer to Service - Control Ther­mostat for testing procedures.
See page 15

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.
See page 19

Refer to Service - Timer for testing
procedures. See page 24 or 25

Remove the Solenoid Valve and
clean any obstruction. Rebuild
or replace the valve if necessary.
See page 19

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

Refer to Service - Timer for testing
procedures. See page 24 or 25

Page 11

Remove the Solenoid Valve and
clean any obstruction. Rebuild
or replace the valve if necessary.
See page 19

10737 120800