Bunn Coffee Maker SRUA Installation Manual
BUNN
®
SRU
SRUA
OPERATING & SERVICE MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
10067.0000F 8/00 ©1981 Bunn-O-Matic Corporation
INTRODUCTION
This brewer will brew a three gallon batch of coffee into the reservoir, which has its own dispensing faucet.The
brewer also has a hot water faucet for allied beverage use. It is only for indoor use on a sturdy counter.
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.
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10067 040100
USER NOTICES
Carefully read and follow all notices on the brewer and in this manual. They were written for your protection.
All notices on the brewer are to be kept in good condition. Replace any unreadable or damaged labels.
#00656.0000
#00831.0000
#00878.0000
#12593.0000
#10044.0000
#03408.0000
#03409.0000
#12555.0000
Page 3
#29299.0000
10067 040100
ELECTRICAL REQUIREMENTS
CAUTION - The brewer must be disconnected from the power source until specified in
Initial Set-Up.
L2 RED
WHITE
NEUTRAL
L1 BLACK
120V A.C.
208 OR
240V A.C.
120V A.C.
P1841 P1842
SRU Model requires 3wire, grounded service rated
120/208 or 120/240 volts ac,
30 amp, single phase, 60 Hz.
Proceed as follows:
L2 RED
230V A.C.
L1 BLACK
P1842
SRUA-CE Models require 2wire, grounded service rated 230
volts ac, 30 amp, single phase,
60 Hz. Proceed as follows:
L2 RED
208 OR
240V A.C.
L1 BLACK
SRUA Models require 2-
wire, grounded service rated
208 or 240 volts ac, 30 amp,
single phase, 60 Hz. Proceed
as follows:
ELECTRICAL INSTALLATION INSTRUCTIONS
CAUTION – Improper electrical installation can damage the equipment and injure the installer. The chassis must
be properly grounded. Do not assume a plumbing line will provide an adequate ground.
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. Before electrically connecting the brewer, remove the side panel from the hood and rotate the control thermostat
knob fully clockwise to the "OFF" position. Keep this knob in the "OFF" position until performing the "
Initial Setup
Replace the side panel.
4. Remove the lower front panel and connect the proper electrical service to the terminal block.
5. Connect the brewer to the power source and verify the voltage at the terminal block before proceeding. Replace
the lower front panel.
6. Disconnect the brewer from the power source. If plumbing has been hooked up, the brewer is ready for the
Initial Setup.
NOTE: Schematic wiring diagrams are included in this manual.
"
PLUMBING REQUIREMENTS
These brewers must be connected to a cold water system with operating pressure between 20 and 90 psi (138
and 621 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 (621 kPa) to reduce it to 50 psi (345 kPa). The
water inlet fitting is 3/8" flare.
NOTE - Bunn-O-Matic recommends 3/8" copper tubing for installations from the 1/2" water supply line. BunnO-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.
Plumbing Hook-up
1. Make certain the 3/8" female flare fitting on the short tube from the outlet of strainer (supplied) is securely
attached to the male fitting at the bottom rear of the brewer.
2. Flush the water line and securely attach it to the 3/8" male flare fitting on the inlet of the strainer.
3. Turn on the water supply.
4. Inspect the connection for leaks.
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10067 040100
ELECTRICAL INSTALLATION INSTRUCTIONS (CONT.)
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).
INITIAL SETUP
CAUTION - The brewer must be disconnected from the power source throughout the initial setup, except when
specified in the instructions.
IMPORTANT: Brewer must be level and installed on a sturdy structure.
Electrician's and Plumber's Instructions are provided. These instructions should be carefully
followed before proceeding with initial setup.
Be sure all electrical and plumbing connections are tight.
1. Disconnect the brewer from the power source.
2. Remove the left side panel from the hood and rotate the control thermostat knob fully counterclockwise to the
"OFF" position. Replace the side panel.
3. Connect the brewer to the power source and place the lighted ON/OFF switch in the "ON" position. Water will
flow into the tank and should automatically stop after approximately 15 minutes.
NOTE - The lighted ON/OFF switch must be in the "ON" position to automatically refill the tank. The switch should
be in the "OFF" position whenever the brewer is left unattended.
4. Disconnect the brewer from the power source.
5. Remove the left side panel from the hood and rotate the control thermostat knob clockwise to the 5 o'clock
position. Replace the side panel.
6. Connect the brewer to the power source and wait for the water in the tank to heat to the proper temperature.
This will take approximately 1-2 hours, depending on the incoming water temperature. Some water will flow
from the overflow tube during this time due to expansion. Draw off a 1/2 gallon of water every 15 minutes during
the initial heat-up to lessen the chance of hot water flow from this expansion.
7. Determine the water temperature by checking the water with a thermometer at the hot water faucet (red handle).
The best brewing temperature is between 195˚ (91˚C) and 200˚F (93˚C). The temperature may be increased by
turning the thermostat knob clockwise and decreased by turning the knob counterclockwise.
8. When the desired temperature is attained, place the funnel support, funnel, and funnel cover on top of the coffee
reservoir. Center the discharge of the water swing spout over the opening in the top of the funnel cover.
9. Place the lighted ON/OFF switch in the "ON" position and momentarily press and release the start switch. Water
should flow from the swing spout into the funnel assembly.
10. Drain and measure the water from the reservoir when the flow of water from this initial cycle stops. If it is three
gallons, proceed to step 12. If it is more or less than three gallons, proceed to step 11.
11. Adjust the brew timer as required. See
12. The brewer is now properly adjusted to brew coffee.
Adjusting Brew Volumes.
Repeat steps 9 & 10.
Bunn-O-Matic recommends a bead of silicon sealant be placed around the base on the countertop
after the initial operation instructions are completed. B.O.M. #M2509.1001 sealant is available.
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10067 080200
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 you see three breaks in the water
stream from the swing arm. Release the switch (Failure to release the switch within two seconds after the
third break in the stream 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 you see three breaks in the water stream from the swing arm. Release the switch. (Failure to
release the switch within two seconds after the third break in the stream 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 you see three breaks in the water stream
from the swing arm, and then release the switch. (Failure to release the switch within two seconds after the
third break in the stream 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.
NOTE: HALF-BATCH AND FULL BATCH SETTINGS MUST EACH BE SET SEPARATELY
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 until switch is once again placed in the “SET” position.
COFFEE BREWING
1. Brewing cycles may be started whenever water temperature is correct. This condition is indicated by the dial
thermometer on front of the brewer. Whenever the pointer is in the green, brewer is ready for brewing.
2. Insert Bunn filter in funnel and add desired amount of coffee.
3. Level the bed of coffee and place funnel into the funnel support. Place funnel cover over the funnel and be sure
the water swing spout is over the center of the funnel cover.
4. Turn "ON/OFF" switch to the "ON" position.(This switch must be in the "ON" position to start and complete a
brewing cycle.)
5. Push and release "START" switch to start the brew cycle.
6. Water swing spout should not be moved as long as water is flowing into the funnel cover. When water stops
flowing, it may then be moved for access to brewing funnel.
7. Remove funnel cover. Funnel should not be removed from urn until drip out of coffee has been completed.
8. To empty funnel, invert it over a waste container to dispose of filter and grounds. An additional flange is
provided on the funnel to help make this step easier.
NOTE: Hot water may be drawn from the hot water faucet during a brew cycle. However, if a large amount of hot
water is drawn off (over 1 gallon) operator should wait to do so between brewing cycles.
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10067 080200
CLEANING
NOTE: Tank and tank components should be delimed regularly based on local water conditions. Excessive mineral
build up on stainless steel surfaces can initiate corrosion reactions resulting in serious leaks,
1. Remove funnel, funnel lid and support. Under hot water, rinse away all coffee oils. Wipe with a clean damp cloth.
2. Drain coffee reservoir by opening coffee faucet. When empty, close faucet.
3. Cycle two or three inches of water into the coffee reservoir and scrub entire reservoir area. (Pour a bucket of
cracked ice in coffee reservoir to obtain a more desirable cleaning water temperature.)
4. Drain coffee reservoir and rinse. Use clean damp cloth to wipe reservoir.
5. Install coffee funnel support, funnel and funnel lid.
6. Remove the sight gauge cap, insert sight gauge cleaning brush into the sight gauge glass tube and clean.
7. To clean coffee faucet, remove the faucet handle from the faucet and faucet clean out cap. Clean faucet with
a faucet cleaning brush and wipe all parts with a damp cloth. Replace faucet seat cup periodically if badly stained
or to stop faucet dripping. DO NOT CLEAN THE HOT WATER FAUCET.
8 Reassemble the coffee faucet.
9. Wipe the entire outside surface of the machine with a clean damp cloth. Wipe dry.
CAUTION - CLEANING SURFACES ARE HOT!!
FILTER HOLDER
1. A filter holder is supplied with each SRU coffee brewer. Its purpose is to keep the filters in their originally
formed shape to properly fit the brewer funnel.
2. It is suggested that only one cluster of filters be placed in the holder at one time for best results.
3. Not using the filter holder may permit the filters to gradually widen out towards a flat shape, especially so if
humidity is present. Once a filter has lost its upright side walls, it may tend to collapse inward when placed
in the brewing funnel. If this happens the hot water spray may cause one side to fall inwards, letting coffee
grounds flow over the edge of filter and into the brewed coffee. Proper use of the holder should prevent this
problem.
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10067 080200
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
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 ac across the red and
white terminals and the black and
white terminal on three wire 102/
208 volt or 120/240 volt models.
(A2) Check the terminal block for
208 volts ac, 230 volts ac or 240
volts ac on "A Series" brewers across
the red and black terminals on two
wire single phase 208 volt, 230 volt
and 240 volt models.
(A3) Check the terminal block for
208 volts ac and 240 volts ac across
the black and blue terminals, the
blue and red and the black and red
terminals on three wire three phase
208 volt and 240 volt models.
Page 8
(B) Check circuit breakers or fuses.
10067 040100
TROUBLESHOOTING (cont.)
PROBLEM
Brew cycle will not start (cont)
PROBABLE CAUSE
3. Water level below pump housing.
(Water level in the hot water gauge
glass should be approximately half
full).
4. ON/OFF Switch
5. Start Switch
6. Timer
7. Pump
8. Solenoid Valve
REMEDY
Be sure water shut-off valve is open
and that the in-line filters or strainers are not blocking water flow. (Do
not confuse water shut-off valve with
the manual fill and drain valve underneath the brewer).
Refer to
Service
- ON/OFF Switch for
testing. See page 22
Refer to
Service
- Start Switches for
testing procedures. See page 27
Refer to
Service
- Timer for testing
procedures. See page 30 or 32
Refer to
Service
- Pump for testing
procedures. See page 23
Refer to
Service
- Solenoid Valve for
testing procedures. See page 25
Tank not filling
9. Strainer
1. ON/OFF Switch (This switch must
be in the "ON" position for the refill
circuit to operate.
2. No water
3. Solenoid Valve
4. Probe
(A) Direction of flow arrow must be
pointing towards brewer.
(B) Remove the strainer and check
for obstructions. Clear or replace.
Refer to
Service
- ON/OFF Switch for
testing procedures. See page 22
Be sure water shut-off is open and
that in-line filters or strainers are not
blocking water flow. (Do not confuse water shut-off valve with the
manual fill and drain valve underneath brewer).
Refer to
Service
- Solenoid Valve for
testing procedures. See page 25
Refer to
Service
- Probe for testing
procedures. See page 20
5. Liquid Level Board
Page 9
Refer to
Service
- Liquid Level Board
for testing procedures. See page 20
10067 080200
TROUBLESHOOTING (cont.)
PROBLEM
Water running out of the overflow
Water is not hot
PROBABLE CAUSE
1. Brewer not level
2. Solenoid Valve
3. Liquid Level Board
4. Probe
1. Limit Thermostat
CAUTION - Do not eliminate or
bypass limit thermostat. Use only
Bunn-O-Matic replacement part
#29329.1000.
REMEDY
Brewer must be level and installed
on a sturdy structure.
Refer to
Service
- Solenoid Valve
for testing procedures. See page
25
Refer to
Service
-Liquid Level
Board for testing procedures. See
page 20
Refer to
Service
- Probe for test-
ing procedures. See page 20
Refer to
Service
- Limit Thermostat for testing procedures. See
page 19
2. Control Thermostat
3. Tank Heater(s)
4. Contactor
Refer to
Service
- Control Thermostat for testing procedures. See
page 17
Refer to
Service
- Tank Heater for
testing procedures. See page 28
Refer to
Service
- Contactor for
testing procedures. See page 15
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10067 080200
TROUBLESHOOTING (cont.)
PROBLEM
Circuit breaker keeps tripping
Water keeps running from swing
spout
PROBABLE CAUSE
1. Circuit Breaker
2. ON/OFF Switch
3. Brew Circuit
4. Refill Circuit
1. Timer
2. Start Switch
REMEDY
Refer to
Service -
Circuit Breaker
for testing procedures. See page
14
Refer to
Service
- ON/OFF Switch
for testing procedures. See page
22
Refer to
Service -
Pump Assembly
for testing procedures. See page
23
Refer to
Service -
Liquid Level
Board for testing procedures. See
page 20
Refer to
Service -
Timer for testing
procedures. See page 30 or 32
Refer to
Service -
Start Switch for
testing procedures. See page 28
Inconsistent coffee yield
Funnel overflows
1. Timer
2. Solenoid Valve
3. Lime build-up in swing spout
and pump tubing.
1. Filters
2. Hole in bottom of funnel
obstructed.
Refer to
Service -
Timer for testing
procedures. See page 30 or 32
Refer to
Service -
Solenoid Valve
for testing procedures. See page
25
Remove swing spout and insert
deliming rod down into pump tubing as far as possible.
Use Bunn® filters made for the
SRU brewer.
Remove obstruction.
Page 11
10067 080200
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