Bunn Single SH User Manual
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SINGLE
1.50 & 1.75 GALLON
SH
OPERATING & SERVICE MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
28230.0000F 3/01 ©1997 Bunn-O-Matic Corporation
www.bunnomatic.com
INTRODUCTION
This equipment will brew a 1/2 gallon, 1 gallon, 1-1/2 gallon or 1-3/4 gallon batches of coffee into an awaiting
server at the push of a button and includes a hot water faucet for allied beverage use and is designed to interface
with a BUNN® Grinder. The brewer is specifically designed for use with a BUNN® 1.5 gallon and 1.75 gallon soft
heat 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 (217)
529-6601 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
28230 092200
USER NOTICES
C
The notices on this brewer should be kept in good condition. Replace unreadable or damaged labels.
00658.0000
00831.0000
! WARNING
00656.0000
20201.5600
ELECTRICAL REQUIREMENTS
CAUTION - The brewer must be disconnected from the power source until specified in
WHITE
NEUTRAL
L1 BLACK
120V.A.
L2 RED
WHITE
NEUTRAL
L1 BLACK
120 V.A.C.
120 V.A.C.
208 or 240
Volts A.C.
RED
NEUTRAL
L1 BLACK
HOT WATER
Initial Set-Up.
200 or 240V A.C.
Requires 2-wire, grounded service rated 120 volts ac, 20 amp,
single phase, 60 Hz.
Requires 3-wire, grounded service rated 120/208 volts or 120/240
volts ac, 20 amp, single phase, 60
Hz.
Page 3
“A" & "B” models require 2-wire,
grounded service rated 200 volts ac,
or 240 volts ac, 20 amp, single phase,
50 Hz.
28230 092200
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 and 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
1
and 620 kPa) from a
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
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.
⁄2" or larger supply line. A shut-off valve should be installed in the line before the brewer. Install
⁄4" flare.
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. Flush the water line and securely attach it to the flare fitting or quick disconnect fitting located on the bottom
of the brewer.
2. Turn on the water supply.
Page 4
28230 092200
INITIAL SET-UP
CAUTION – The brewer must be disconnected from the power source throughout the initial set-up, except when
specified in the instructions.
1. Remove the front panel beneath the sprayhead and 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 and 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. Triple set timers require the setting of each dial
individually. The 5 minute dial is for 1/2 gallon, 8 minute dial is for 1 gallon and the 10 minute dial is for 1-1/
2 or 1-3/4 gallon settings.
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, 192 oz - 1-1/2 gallon or 224
oz - 1-3/4 gallon.
7. (A) If not, adjust the timer as required. Refer to Adjusting Brew Volumes.
(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 of 1,
1-1/2 or 1-3/4 gallon.
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
28230 092200
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
28230 092200
OPERATING CONTROLS
BREW SELECTOR SWITCH
Placing the switch in the 1/2 gallon, 1 gallon, 1-1/2 or 1-3/4 gallon 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 timer 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 timer 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.
6 Place 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
28230 092200
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
Equipment will not operate.
Brew cycle will not start.
Probable Cause
1. No power or incorrect voltage
1. No water
Remedy
(A1) Check the terminal block for
120 volts across the black and white
terminals on 120 volt two wire brewers.
(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.
Check plumbing and shut-off valves
Page 8
28230 092200
TROUBLESHOOTING (cont.)
Problem
Brew cycle will not start (cont.)
Probable Cause
2. Water strainer/flow control (.500
GPM)
3. ON/OFF switch
4. Start switch
5. Timer
6. Dispense Valve
Remedy
(A) Direction of flow arrow must be
pointing towards brewer.
(B) Remove the strainer/flow control and check for obstructions. Clear
or replace.
Refer to
Service
- ON/OFF switch for
testing procedures. See page 28
Refer to
Service -
Start switch for
testing procedures. See page 33
Refer to
Service -
Timer for testing
procedures. See page 36 & 38
Refer to
Service -
Dispense valve for
testing procedures. See page 24
Automatic refill will not operate
7. Brew selector switch
1. No water
2. Water strainer/flow control (.500
GPM)
3. Overflow protection switch
4. Level control board & level probe.
5. Solenoid valve
Refer to
Service
- Brew selector
switch for testing procedures. See
page 16
Check plumbing and shut-off valves.
(A) Direction of flow arrow must be
pointing towards brewer.
(B) Remove the strainer/flow control and check for obstructions. Clear
or replace.
Refer to
Service -
Overflow protection switch for testing procedures.
See page 25
Refer to
Service
- Level control board
for testing procedures. See page 26
Refer to
Service
- Solenoid valve for
testing procedures. See page 32
Page 9
28230 092200
TROUBLESHOOTING (cont.)
Problem
Beverage level will not adjust (Selector switch in any position)
Water flows into tank continuously
(ON/OFF Switch "ON")
Water flows into tank continuously
(ON/OFF Switch "OFF")
Water from tank is not hot
Probable Cause
1. Brew selector switch
1. Timer
1. Level control board and level probe
2. Overflow protection switch
3. Solenoid valve
1. Limit thermostat
CAUTION - Do not eliminate or bypass limit thermostat. Use only
B.O.M. Part #23717.0001
Remedy
Refer to
Service
- Selector switch for
testing procedures. See page 16
Refer to
Service
- Timer for testing
procedures. See page 36 & 38
Refer to
Service
- Level control board
for test procedures. See page 26
Refer to
Service
- Overflow protection switch for testing procedures.
See page 25
Refer to
Service
- Solenoid valve for
testing procedures. See page 32
Refer to
Service
-Limit thermostat
for testing procedures. See page 19
Spitting or unusual steaming from
sprayhead or airvent.
2. Control thermostat
3. Contactor
4. Tank heater
1. Control thermostat
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.
Refer to
Service
- Control thermostat for testing procedures. See page
22
Refer to
Service
- Contactor for test
procedures. See page 20
Refer to
Service
- Tank heater for
testing procedures. See page 34
Refer to
Service
- Control thermostat for testing procedures. See page
22
Inspect the tank assembly for excessive lime deposits. Delime as
required.
Page 10
28230 092200
TROUBLESHOOTING (cont.)
Problem
Inconsistent beverage level in server.
Consistently high or low beverage
level in server.
Dripping from sprayhead.
Probable Cause
1. Strainer/flow control (.500 GPM)
2. Improper water pressure
3. Dispense valve
1. Timer adjustment
1. Dispense valve
Remedy
(A) Direction of flow arrow must be
pointing towards the brewer.
(B) Remove the strainer/flow control and check for obstructions. Clear
or replace.
Check the operating water pressure
to the brewer. It must be between 20
and 90 psi (138 and 620 kPa).
Refer to
Service -
Dispense valve for
testing procedures. See page 24
Adjust the timer as required to
achieve the recommended volume
for each brew cycle.
Refer to
Service
- Dispense valve for
testing procedures. See page 24
Water overflows filter.
Beverage overflows server.
1. Bypass valve
2. Type of paper filters
3. No sprayhead
1. Beverage left in server
2. Timer adjustment
3. Dispense valve
Refer to
Adjustments
on page 4 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 volume
for each brew cycle.
Refer to
Service
- Timer for testing
procedures. See page 36 & 38
Refer to
Service
- Dispense valve for
testing procedures. See page 24
Page 11
28230 092200
TROUBLESHOOTING (cont.)
Problem
Weak beverage
Probable Cause
1. Type of paper filters
2. Coffee
3. Sprayhead
4. Funnel loading
5. Water temperature
Remedy
®
BUNN
paper filters should be used
for proper extraction.
A sufficient quantity of fresh drip or
regular grind should be used for
proper extraction.
B.O.M. Sprayhead #01082.0002
should be used to properly wet the
bed of ground coffee in the funnel.
The BUNN® paper filter should be
centered in the funnel and the bed of
ground coffee leveled by gentle shaking.
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 temperature immediately below the
sprayhead with a thermometer. The
reading should not be less than 195°F
(91°C).
Brewer is making unusual noises.
1. Solenoid (Inlet)
2. Plumbing lines
3. Water supply
4. Tank heater
5. Contactor
Page 12
The nut on back of the solenoid
must be tight or it will vibrate during
operation
Plumbing lines should not be resting on the counter top.
(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).
Remove and clean lime off the tank
heater.
Check for low voltage.
28230 030101
TROUBLESHOOTING (cont.)
Problem
Server will not heat
Probable Cause
1. Circuit breaker
2. Receptacle contact
3. Relay (Server Power)
(Prior to S.N. SNG0014000)
4. Transformer
5. Rectifier
Remedy
A) Check and reset if necessary
B) Refer to
Service -
Circuit breaker
for test procedures. See page 18
Clean or replace. See page 29
Refer to
Service -
Relay (Server
Power) for test procedures. See page
31
Refer to
Service
- Transformer for
test procedures. See page 35
Refer to
Service
- Rectifier for test
procedures. See page 30
Page 13
28230 092200
SERVICE
This section provides procedures for testing
and replacing various major components used in this
brewer should service become necessary. Refer to
Troubleshooting
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.
for assistance in determining the
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. HEATED WHEN EMPTY
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FIG. 1 COMPONENT ACCESS
P1357
Page 14
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