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FAILURE TO COMPLY RISKS INJURY
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GLASS FAILURE/HOT LIQUID
BURNS AN
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D FIRE HAZARD
OPERATING & SERVICE MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
32430.0000B 7/00 © 1999 BUNN-O-MATIC CORPORATION
Page 2
CONTENTS
Introduction ............................................................... 2
User Notices .............................................................. 3
Electrical Requirements ............................................. 4
Plumbing Requirements ............................................ 4
Initial Set-Up.............................................................. 5
Operating Controls..................................................... 6
Coffee Brewing .......................................................... 7
Cleaning..................................................................... 7
Troubleshooting ......................................................... 8
Service....................................................................... 12
Wiring Diagrams........................................................ 24
INTRODUCTION
This equipment will brew a half-gallon batch of coffee into an awaiting decanter at the press of a button. The
OL has two and the RL has five warmers to keep the beverage at the right temperature, on the RL one of which
is capable of heating water to boiling. The brewer 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
32430 121699
Page 3
USER NOTICES
Carefully read and follow all notices on the equipment and in this manual. They were written for your protection.
All notices on the equipment should be kept in good condition. Replace any unreadable or damaged labels.
00831.0000
!
WARNING
Fill water tank before turning -on
thermostat or connecting appliance
to power source.
Use only on a properly protected
circuit capable of the rated load.
Electrically ground the chassis.
Follow national/local electrical codes.
Do not use near combustibles.
FAILURE TO COMPLY RISKS EQUIPMENT
DAMAGE, FIRE, OR SHOCK HAZARD
READ THE ENTIRE OPERATING MANUAL
BEFORE BUYING OR USING THIS PRODUCT
THIS APPLIANCE IS HEATED WHENEVER
CONNECTED TO A POWER SOURCE
00831.0000F 3/98 © 1988 BUNN-O-MATIC CORPORATION
00658.0000
This equipment is to 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).
00656.0000
Page 3
32430 121699
Page 4
ELECTRICAL REQUIREMENTS
200 OR 240V.A.C.
L1 BLACK
L2 RED
CAUTION - Do not connect the brewer to the power source until specified in Initial Set-Up.
WHITE
NEUTRAL
L1 BLACK
120V.A.C.
MODELS OL15 & 20 require 2wire, grounded service rated
120 volts ac, 15 or 20 amp respectively, single phase, 60 Hz.
L2 RED
WHITE
NEUTRAL
L1 BLACK
120V.A.C.
208 or 240V.A.C.
120V.A.C.
MODELS OL35 & RL35 require
3-wire, grounded service rated
120/208 or 120/240 volts ac, 20
amp, single phase, 60 Hz.
Electrical Hook-Up
Model OL15 has an attached cordset.
Models OL20, OL35, & RL35, proceed as follows:
CAUTION – Improper electrical installation will dam-
age 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 top panel and rotate the control thermostat knob fully counterclockwise to the "OFF"
position and replace the panel.
4. Remove the rear panel, 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 rear 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 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 to reduce it to 50 psi. The water inlet
fitting is 1/4" flare.
RED
MODELS OLA, RLA, OL35B &
RL35B require 2-wire,
grounded service rated 240
volts ac or 200 volts ac, 20 amp
NEUTRAL
L1 BLACK
MODEL OL25B requires 2wire, grounded service
rated 100 volts ac, 20 amp
single phase, 50 Hz.
100V.A.C.
single phase, 50 Hz.
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P1478
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 counter top. 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.
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).
Page 4
32430 121699
Page 5
PLUMBING REQUIREMENTS (Cont.)
Plumbing Hook-Up
Model OL15 has an attached water strainer, proceed to step 2.
Models OL20, OL35, & RL35, proceed as follows:
1. Remove the rear panel and bottom pan. Run the long piece of tubing from the strainer (supplied) under the
brewer and attach it to the water inlet fitting on the bottom bracket. Reinstall the bottom pan and rear panel.
2. Flush the water line and securely attach it to the 1/4" flare fitting on the strainer.
3. Turn on the water supply.
INITIAL SETUP
CAUTION - The brewer must be disconnected from the power source throughout the initial setup, except when
specified in the instructions.
1. Remove the top panel.
2. Rotate the control thermostat knob fully counterclockwise to the "OFF" position and replace the
panel.
3. Insert an empty funnel into the funnel rails.
4. Place a decanter containing a small amount of
water on the warmer beneath the funnel.
5. Connect the brewer to the power source, place
the On/Off brew station warmer switch the upper
position, and momentarily press the start switch.
Water will begin flowing into the tank. When
water stops flowing into the tank, initiate a second and a third brew cycle. During this third brew
cycle the tank will fill to its capacity and the excess will flow from the sprayhead, out of the funnel, and into the decanter.
NOTE - The On/Off brew station warmer switch must
be in the upper position to initiate and complete a brew
cycle.
6. Place the On/Off brew station warmer switch in
the lower position.
7. Disconnect the brewer from the power source.
8. Remove the top panel.
9. Rotate the control thermostat knob fully clockwise to the "ON" position and replace the panel.
10. Connect the brewer to the power source 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.
11. Place an empty decanter under the funnel.
12. Place the On/Off brew station warmer switch in
the upper position and momentarily press the
start switch. Empty the decanter after water has
stopped flowing from the funnel.
13. Allow the water in the tank to reheat to the proper
temperature.
14. Place an empty decanter on the warmer and press
the start switch. Check the water volume in the
decanter after water has stopped flowing from
the funnel. It should be 64 ounces.
15. If not, disconnect the brewer from the power
source and remove the top panel.
16. Add or remove washers to the float on the level
switch as required. Adding washers increases the
volume, removing washers decreases it. Replace
the top panel, connect the brewer to the power
source, start, and measure another brew cycle.
17. Repeat steps 13-16 until 64 oz water volume is
achieved.
FUNNEL CONTENTS
ARE HOT
FAILURE TO COMPLY RISKS INJURY
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Page 5
Page 6
FUNNEL CONTENTS
ARE HOT
FAILURE TO COMPLY RISKS INJURY
PN: 658
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CAUTION
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FUNNEL CONTENTS
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FAILURE TO COMPLY RISKS INJURY
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Page 6
Page 7
COFFEE BREWING
Start each brew cycle with an empty, clean, half-gallon decanter.
1. Insert a BUNN® filter into the funnel.
2. Pour the fresh coffee into the filter and level the bed of grounds by gently shaking.
3. Slide the funnel into the funnel rails.
4. Place the On/Off brew station warmer switch in the upper position.
5. Momentarily press the start switch.
6. 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.
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 five 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
32430 121699
Page 8
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 electric components have 120 volt ac voltage on their terminals. Shorting of terminals or the application
of external voltages may result in equipment failure.
• Intermittent operation of electronic equipment is unlikely. Component 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 unless disconnected from the power source. Keep away from combustibles.
WARNING
• Exercise extreme caution when servicing electrical equipment.
• Disconnect the brewer from the 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
2. Water Strainer
3. Water Level Switch and Overflow
Safety Switch
Remedy
(A) Connect the brewer to the power
source.
(B) Check the terminal block for the
proper voltages.
(C) Check circuit breaker/fuse.
Check plumbing and shut-off valves.
(A) Direction of flow arrow must be
pointing towards brewer.
(B) Remove the strainer and check
for obstructions. Clear or replace.
Refer to Service - Water Level Switch
and Overflow Safety Switch for testing procedures. See page 23.
Page 8
32430 121699
Page 9
TROUBLESHOOTING (cont.)
Problem
Brew cycle will not start. (cont.)
Water flows into fill basin continuously (On/Off brew station warmer
switch "OFF").
Water flows into fill basin continuously (On/Off brew station warmer
switch "ON").
Probable Cause
4. On/Off Brew Station Warmer
Switch
5. Start Switch
6. Relay
7. Solenoid Valve
1. Solenoid Valve
1. Start Switch
Remedy
Refer to Service - On/Off Brew Station Warmer Switch for testing procedures. See page 15.
Refer to Service - Start Switch for
testing procedures. See page 17.
Refer to Service - Relay for testing
procedures. See page 21.
Refer to Service - Solenoid Valve for
testing procedures. See page 20.
Refer to Service - Solenoid Valve for
testing procedures. See page 20.
Refer to Service - Start Switch for
testing procedures. See page 17.
Water is not hot.
Decanter warmer is not hot.
1. Limit Thermostat
CAUTION
Do not eliminate or bypass limit thermostat. Use only B.O.M. replacement part #29329.1000
2. Control Thermostat
3. Tank Heater
1. Warmer Switches
Refer to Service - Limit Thermostat
for testing procedures. See page 19.
Refer to Service - Control Thermostat for testing procedures. See
page 13.
Refer to Service - Tank Heater for
testing procedures. See page 22.
(A) The Warmer Switch(es) must be
in the "ON" position for the warmer
to operate.
(B) Refer to Service - Warmer
Switch(es) for testing procedures.
See pages 15 & 16.
2. Decanter Warmers
Page 9
Refer to Service - Warmers for testing procedures. See page 14.
32430 070700
Page 10
TROUBLESHOOTING (cont.)
Problem
Spitting or unusual steaming from
sprayhead.
Warmer plates too hot, solenoid coil
smoking, or water in tank heats excessively fast.
Probable Cause
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.
1. Brewer wired to wrong voltage
Remedy
Refer to Service - Control Thermostat for testing procedures. See
page 13.
Inspect the tank assembly for excessive lime deposits. Delime as required.
Refer to Electrical Requirements Page 4.
Inconsistent beverage level in decanter.
Dripping from sprayhead.
1. Improper water pressure
2. Syphon system
1. Syphon system
Check the operating water pressure
to the brewer. It must be between
20 and 90 psi.
Water should flow freely from the
sprayhead and then stop abruptly.
The brewer must be level from frontto-back to syphon properly.
Water should flow freely from the
sprayhead and then stop abruptly.
The brewer must be level from frontto-back to syphon properly.
2. Solenoid Valve
Page 10
Refer to Service - Solenoid Valve for
testing procedures. See page 20.
32430 121699
Page 11
TROUBLESHOOTING (cont.)
Problem
Beverage overflows decanter.
Weak beverage.
Probable Cause
1. Beverage left in decanter
1. Type of paper filters
2. Coffee
3. Sprayhead
4. Funnel loading
Remedy
The brew cycle should be started
only with an empty decanter under
the funnel.
BUNN® paper filters should be used
for proper extraction.
A sufficient quantity of fine or drip
grind coffee should be used for
proper extraction.
B.O.M. sprayhead #01082.0000
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 coffee leveled by gentle shaking.
Brewer is making unusual noises.
5. Water temperature
1. Solenoid Valve
2. Plumbing lines
3. Water supply
Place a funnel over an empty decanter on the warmer beneath the
sprayhead. Place the On/Off brew
station warmer switch in the upper
position, press the start switch, and
check the water temperature immediately below the sprayhead with an
accurate thermometer. The reading
should not be less than 195° F. Ad-
just the control thermostat slightly
clockwise to increase the water temperature.
The nut on top of the solenoid valve
must be tight or it will vibrate during operation.
Plumbing lines should not rest on
the counter top.
(A) The brewer must be connected
to a cold water line.
Page 11
(B) Water pressure to the brewer
must not be higher than 90 psi. Install a regulator if necessary to lower
the working pressure to approximately 50 psi.
32430 121699
Page 12
Page 12
Page 13
SERVICE (cont.)
Control Thermostat
FIG. 2 CONTROL THERMOSTAT
The indication must be as described in step 2.
Voltage must not be indicated across these terminals when the thermostat is turned "OFF" (fully
counterclockwise).
5. Disconnect the brewer from the power source.
If voltage is present as described, the control thermostat is operating properly.
If voltage is not present as described, replace the control thermostat.
I
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UNN
B
Removal and Replacement:
1. Remove the top cover or top warmer housing
from the brewer to gain access.
2. Remove both wires from the control thermostat
terminals.
3. Remove the thermostat bulb by firmly pullingup on the capillary tube at the tank lid. This will
disengage the grommet from the tank lid.
4. Remove the two #8-32 screws holding the control thermostat to the bracket.
5. Fasten the new control thermostat to the component bracket.
P1478
NOTE - Make sure that the capillary tube is away from
any electrical termination and is not kinked.
Location:
The control thermostat is located under the top
cover or top warmer housing, FIG. 2.
To test the control thermostat, access will also
be needed to the tank heater located in the bottom of
the tank assembly.
Test Procedure:
1. Disconnect the brewer from the power source.
2. Check the voltage across the blue wire on the
control thermostat and the white or red wire on
the tank heater 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 or 240 volts ac for two wire 200 volt or
240 volt models and three wire 120/240 volt
models.
c) 100 volts ac for two wire 100 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 brewer wiring harness.
6. Slide the grommet to the red mark on the capillary tube.
7. Insert the 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.
8. Carefully bend the capillary tube so that the tube
and bulb inside the tank are in a vertical position.
9. Refer to FIG. 3 when reconnecting the wires.
10. Readjust the control thermostat dial as required.
BLU to Limit Thermostat
BLK to Tank Heater
4. Check the voltage across the black wire terminal
of the control thermostat and the white or red
wire on the tank heater with a voltmeter when
the control thermostat is turned "ON" (fully clockwise). Connect the brewer to the power source.
Page 13
P1098
FIG. 3 THERMOSTAT WIRING
32430 121699
Page 14
Page 14
Page 15
Page 15
Page 16
SERVICE (cont.)
Warmer Switch(es)
RL: Left Rear, Left Front, Right Rear & Right Front
R
E
T
N
A
C
E
D
D
R
A
CAUTION
C
S
I
D
!
:
F
I
D
E
K
R
C
D
E
A
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M
R
H
R
C
C
.
A
Y
T
Y
T
A
W
R
Y
P
WARNING
T
D
R
R
A
M
C
D
E
E
S
TER
!
.
D
H
N
E
E
H
E
M
AN
L
G
H
I
I
A
WAY
L
O
H
W
A
F
DEC
B
C
I
D
L
.
I
S
H
ES
E
R
O
K
T
G
T
I
B
IBL
A
C
IS
H
T
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E
R
N
L
H
NO
UST
Y
.
E
O
L
B
Y
P
M
D
DO
D
UID
R
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M
E
E
Q
C
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S
U
S
P
LI
J
S
O
U
C
T
.
P
N
T
O
EE
O
IN
X
O
K
I
T
N
E
T
S
E
A
ARD
S
E/H
RE
R
R
T
N
O
C
L
T
E
P
O
N
M
H
N
O
E
U
C
F
R
A
O
1
T
E
R
U
L
I
A
F
58
6
:
N
P
Z
K
T
U
O
O
N
UR
P
S
L
.
I
HA
R
L
E
O
R
M
AI
FAI
C
E
IRE
Y
IC
L
F
T
L
E
SS F
A
A
M
-
L
O
AND
-
G
N
N
NS
U
B
5
UR
8
B
9
P1713
FIG. 10 WARMER SWITCHES
Location:
These warmer switches are the two at the left
and the left most one on the right of the base as viewed
from the front, FIG. 10. Their knobs are marked Off/
On/Off/On.
To test these switches, access will also be needed
to the terminal block located in the rear of the brewer.
Test Procedure:
1. Check the voltage across terminal L1 and the
white or red wire on the terminal block with a
voltmeter. Connect the brewer to the power
source. The indication must be:
a) 120 volts ac for two wire 120 volt models and
three wire 120/240 volt models.
b) 200 or 240 volts ac for two wire 200 volt or
240 volt models.
c) 100 volts ac for two wire 100 volt models.
2. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #3.
If voltage is not present as described, refer to the Wiring Diagrams and check the brewer wiring harness.
3. Check the voltage across terminal 1 and the white
or red wire on the terminal block with a voltme-
ter when the switch is in the "ON" position. Con-
nect the brewer to the power source. The indica-
tion must be as described in step 1. Voltage must
not be present across these terminals in the "OFF"
positions.
4. Disconnect the brewer from the power source.
If voltage is present as described, the switch is operating properly.
If voltage is not present as described, replace the
switch.
Removal and Replacement:
1. Remove the knob from the switch.
2. Loosen the 5/8" nut on the switch shaft and push
the switch through the opening.
3. Remove the wires from the switch terminals.
4. Refer to FIG. 11 when reconnecting the wires.
5. Securely mount the new switch onto the housing and reinstall the knob.
L1
BLK (L1) (see below)
BLK (1) (see below)
1
FIG. 11 WARMER SWITCH WIRING
MODEL
RL Left Rear BLK 1 to Warmer
BLK L1 to Left Front Warmer Switch
RL Left Front BLK 1 to Warmer
BLK L1 to Left Rear Warmer Switch
to Brew Station Warmer Switch
RL Right Front BLK 1 to Warmer
BLK L1 to Terminal Block
to Brew Station Warmer Switch
to Right Rear Warmer Switch
RL Right Rear BLK 1 to Warmer
BLK L1 to Right Front Warmer Switch
Page 16
P1695
32430 121699
Page 17
SERVICE (cont.)
Start Switch
FIG. 12 START SWITCH - MODEL OL
If continuity is present as described, reconnect the
wires, the switch is operating properly.
If continuity is not present as described, replace the
switch.
Removal and Replacement:
1. Remove all wires from the switch terminals.
2. Compress the clips inside the housing and gen-
R
E
N
T
N
O
A
I
C
T
E
D
U
D
R
A
A
C
C
S
I
D
!
:
F
I
D
E
K
C
D
A
E
R
H
C
C
.
Y
T
T
A
Y
P
R
R
M
C
D
E
S
.
D
N
E
E
E
M
L
H
I
A
L
O
W
F
B
C
I
D
.
H
E
R
T
G
T
I
A
C
H
E
E
N
L
H
.
E
O
Y
D
D
R
E
E
S
U
S
J
S
O
U
.
P
N
T
N
I
O
X
I
N
T
E
S
E
A
S
R
R
T
K
T
O
O
N
P
S
N
.
I
R
E
O
O
R
M
C
C
E
C
Y
I
L
L
T
L
E
T
A
E
P
M
O
-
N
M
O
H
-
N
N
O
N
E
U
C
U
F
R
B
5
A
O
8
9
T
1
E
R
U
L
I
A
F
8
5
6
:
N
P
tly 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 housing.
4. Refer to FIG. 14 when reconnecting the wires.
P1712
P1713
FIG. 13 START SWITCH - MODEL RL
Location:
The start switch is located in the base, below and to
the right of the brew station, FIG.s 12 & 13.
Test Procedure:
1. Disconnect the brewer from the power source
and remove the wires from both terminals of the
start switch.
2. Check for continuity across the two terminals on
the switch when it is held in the lower position.
Continuity must not be present across these terminals in the upper position.
BLU to Relay P1
BLK to Relay P3
& Level Switch
P1697
FIG. 14 START SWITCH WIRING
Page 17
Page 18
SERVICE (cont.)
Indicator Lamp(s)
R
E
T
N
A
EC
D
D
R
A
CAUTION
C
S
I
D
!
:
F
I
D
E
K
C
D
A
E
R
H
C
C
.
Y
T
T
A
Y
P
R
R
M
C
D
E
S
.
D
N
E
E
E
M
L
H
I
A
L
O
W
F
B
C
I
D
.
H
E
R
T
G
T
I
A
C
H
E
E
N
L
H
.
E
O
Y
D
D
R
E
E
S
S
U
O
S
J
U
.
P
N
T
N
O
X
I
I
N
T
E
S
E
A
S
R
T
K
T
OR
O
N
N
S
.
I
E
O
ORP
M
R
C
E
C
C
Y
I
L
L
T
L
E
T
A
E
P
O
-M
N
O
M
-
H
N
N
O
N
E
U
F
C
R
BU
O
85
9
A
1
T
E
R
U
L
I
A
F
8
5
6
:
N
P
FIG. 15 INDICATOR LAMPS - MODEL OL
c) 100 volts ac for two wire 100 volt models.
4. Disconnect the brewer from the power source.
If voltage is present, the indicator lamp is operating
properly.
If voltage is not present, replace the indicator lamp.
Removal and Replacement:
1. Compress the clips inside the housing and gently push the indicator lamp through the opening.
2. Remove the wires from the indicator lamp terminals.
3. Refer to FIG. 17 when reconnecting the wires.
4. Push the new indicator lamp firmly into the
opening.
P1712
WHI or RED
(see below)
R
E
T
N
A
C
E
D
D
R
A
CAUTION
C
S
I
D
!
:
F
I
D
E
K
C
D
ER
A
E
R
H
RM
C
C
.
A
Y
T
T
A
W
Y
P
WARNING
T
R
R
A
M
C
D
E
E
S
!
.
D
H
N
E
E
H
E
M
L
AY
H
I
IG
A
ECANTER DRY
L
O
H
W
F
B
C
I
D
.
S
H
E
R
K
T
G
T
I
IBLES AW
A
C
H
E
E
RIS
N
L
H
Y
.
E
O
L
ID
O NOT BOIL D
Y
P
D
D
D
U
R
M
E
E
O
S
U
S
LIQ
J
S
O
U
C
T
.
P
N
T
N
O
I
D
X
KEEP COMBUST
IO
T
N
E
T
N
O
C
L
T
E
O
N
H
N
O
E
U
C
F
R
A
O
T
E
R
U
L
I
A
F
8
5
6
:
N
P
HO
E
T
/
E
S
A
AR
S
E
R
R
R
Z
K
T
U
O
O
A
N
UR
P
S
.
IL
I
R
E
IL
O
R
M
E H
A
FA
C
E
IR
Y
IC
L
S F
T
L
F
E
S
A
D
P
A
M
-
N
L
M
O
-
G
N
S A
N
N
U
R
B
5
8
BU
9
1
P1713
FIG. 16 INDICATOR LAMP - MODEL RL
Location:
The indicator lamps are located beneath their associated warmers, FIG.s 15 and 16.
Test Procedure:
1. Check continuity of the black wire from the switch
to the indicator lamp.
2. Check continuity of the white or red wire from
the indicator lamp to the terminal block.
If continuity is present, proceed to #3.
If continuity is not present, refer to Wiring Diagrams
and check brewer wiring harness.
BLK (see below)
P1694
FIG. 17 INDICATOR LAMP WIRING
MODEL
OL Upper BLK to Warmer Switch
WHI or RED to Warmer
to Harness P2
OL Lower BLK to On/Off Brew Station Warmer
Switch
WHI or RED to Relay P2
to Brew Station Warmer
RL BLK to On/Off Brew Station Warmer
Switch
WHI or RED to Right Front Warmer
to Left Front Warmer
3. Check for voltage across the indicator lamp ter-
minals. Connect the brewer to the power source.
The indication must be:
a) 120 volts ac for two wire 120 volt models and
three wire 120/240 volt models.
b) 200 or 240 volts ac for two wire 200 volt or
240 volt models.
Page 18
32430 121699
Page 19
SERVICE (cont.)
Limit Thermostat
FIG. 18 LIMIT THERMOSTAT
4. Check for continuity across the limit thermostat
terminals.
If continuity is present as described, the limit thermostat is operating properly.
If continuity is not present as described, replace the
limit thermostat.
Removal and Replacement:
1. Remove both wires from the limit thermostat terminals.
2. Carefully slide the limit thermostat out from under the retaining clip.
3. Carefully slide the new limit thermostat into the
retaining clip.
4. Refer to FIG. 19 when reconnecting the wires.
P1715
Location:
The limit thermostat is located on the back of the tank
assembly, FIG. 18.
Test Procedure:
1. Disconnect the brewer from the power source.
2. Check voltage across the black wire from the limit
thermostat and the white or red wire on the tank
heater terminal. Connect the brewer to the power
source. The indication must be:
a) 120 volts ac for two wire 120 volt models.
b) 200 or 240 volts ac for two wire 200 volt or
240 volt models and three wire 120/240 volt
models.
c) 100 volts ac for two wire 100 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 brewer wiring harness.
P1984
FIG. 19 LIMIT THERMOSTAT WIRING
Page 19
Page 20
SERVICE (cont.)
Solenoid Valve
FIG. 20 SOLENOID VALVE
Location:
The solenoid valve is located under the top cover or
top warmer housing, FIG. 20.
Test Procedure:
1. Check the voltage across the white and the black
and blue wires with a voltmeter when the On/Off
brew station warmer switch is in the upper position and the start switch is pressed to the lower
position and released. Connect the brewer to the
power source. The indication must be:
a) 120 volts ac for two wire 120 volt models and
three wire 120/240 volt models,
b) 200 or 240 volts ac for two wire 200 volt or
240 volt models,
c) 100 volts ac for two wire 100 volt models.
2. Disconnect the brewer from the power source.
4. Check the solenoid valve for coil action. Connect the brewer to the power source, place the
On/Off brew station warmer switch in the upper
position, press and release the start switch. Listen carefully in the vicinity of the solenoid valve
for a "clicking" sound as the coil magnet attracts
and after the approximate setting of the level float
switch, repels the plunger.
5. Disconnect the brewer from the power source.
If the sound is heard as described and water will not
pass through the solenoid valve, there may be a blockage in the water line before or after 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, replace the
solenoid valve.
Removal and Replacement:
1. Disconnect the brewer from the power source.
2. Turn off the water supply to the brewer.
3. Remove the top cover or top warmer housing to
gain access.
4. Disconnect all wires from the solenoid valve.
5. Disconnect the water lines to and from the solenoid valve.
6. Remove the two #8-32 screws which hold the
solenoid valve and mounting bracket to the component bracket.
7. Lift out the solenoid valve and bracket. Remove
the bracket from the solenoid valve and save to
mount the new valve.
8. Securely install the new solenoid valve to the
mounting bracket with two #10-32 screws. Check
the direction of flow arrow on the valve. It must
be pointing toward the tank inlet tube.
9. Securely attach the valve and bracket to the component bracket using the two #8-32 screws.
10. Securely fasten the water lines to and from the
solenoid valve.
11. Refer to FIG. 21 when reconnecting the wires.
If voltage is present as described, proceed to #3.
If voltage is not present as described, refer to the Wiring Diagrams and check the brewer wiring harness.
3. Check for continuity across the solenoid valve
coil terminals.
If continuity is present as described, reconnect the
white and the black and blue wires and proceed to #4.
If continuity is not present as described, replace the
solenoid valve.
FIG. 21 SOLENOID VALVE WIRING
Page 20
Page 21
Page 21
Page 22
SERVICE (cont.)
Tank Heater
P1715
FIG. 23 TANK HEATER
Location:
The tank heater is located in the bottom of the tank
assembly, FIG. 23.
Test Procedure:
1. Check the voltage across the black and white or
red wires on the tank heater with a voltmeter when
the control thermostat is turned "ON" (fully clockwise). Connect the brewer to the power source.
The indication must be:
a) 120 volts ac for two wire 120 volt models.
b) 200 or 240 volts ac for two wire 200 volt or
240 volt models and three wire 120/240 volt
models.
c) 100 volts ac for two wire 100 volt models.
2. Disconnect the brewer from the power source.
Removal and Replacement:
1. Disconnect the brewer from the power source.
2. Remove the top cover or top warmer housing
and the rear access panel.
3. Disconnect the wires to the tank heater.
4. Gently pull the thermostat bulb with grommet out
of the tank lid.
5. Disconnect and remove the fill basin tube.
6. Remove the four #8-32 nuts and hold-down
brackets attaching the tank lid to the tank assembly and remove the tank lid and gasket.
7. Drain the water from the tank using a syphon or
similar device.
8. Remove the two nuts securing the tank heater to
the bottom of the tank and remove the tank heater.
9. Install a new tank heater with new washers and
secure with two nuts. Nuts should be securely
tightened to insure a proper seal.
10. Install the tank lid and gasket using the four holddown brackets and #8-32 nuts.
11. Install the fill basin tube and tighten the nuts securely.
12. Slide the grommet to the red mark on the capillary tube.
13. Carefully bend the capillary tube so that the tube
and bulb inside the tank are in a vertical position.
14. Insert the 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.
15. Refer to FIG. 24 when reconnecting the wires.
16. Refer to Initial Setup to refill the tank.
If voltage is present as described, proceed to #3.
If voltage is not present as described, refer to the Wiring Diagrams and check the brewer wiring harness.
3. Check for continuity across the terminals of the
tank heater.
If continuity is present as described, reconnect the
wires, the tank heater is operating properly.
If continuity is not present as described, replace the
tank heater.
NOTE - If the tank heater remains unable to heat, remove and inspect the heater for cracks in the sheath.
Page 22
WHI (Models OL15 & 20) to Terminal Block
RED (Models OL35 & RL35) to Terminal Block
BLK to Control Thermostat
FIG. 24 TANK HEATER WIRING
P1716
32430 121699
Page 23
I
F
H
F
O
N
N
BU
Page 23
Page 24
BLK
SCHEMATIC WIRING DIAGRAM OL
GREEN
LIMIT
THERMOSTAT
BLU
SW. &
THERMOSTAT
BLK
TANK HEATER
WHI (OL15 & 20)
RED (OL35)
NL1
L2
WHI
BLK
P3
BLK BLK
BLK
BLK
SOL
BLK
BLU
WHI
OPTIONAL LOW WATER PRESSURE VALVE
BLK
PNKBLK PNK BLK
BLK
P3
BLU
P1
P2
WHI
"KEEP WARM" HEATER
WHI
BREW STATION WARMER
SAFETY SWLEVEL SW
PNK
PNK
BLK
K1 N.O.
K1
BLU
WHI
UPPER WARMER
P3
P2 WHI
P1
BLK
BLU
P2 & P3 ARE PINS OF A
POLARIZED THREE-PIN
BREW SW
P1,P2 & P3 ARE PINS OF A
POLARIZED THREE-PIN
CONNECTOR.
WHI
CONNECTOR.
P2
WHI
WHI
WHI
WHI
WHI VIO
BLK
120 VOLTS AC 2 WIRE
120/240 VOLTS AC 3
WIRE
SINGLE PHASE
60 HZ
BR. RECT
WHI/VIO
10007.0000D 10/98 © 1990 BUNN-O-MATIC CORPORATION
SOL
Page 24
32430 121699
Page 25
L1
BLK
SCHEMATIC WIRING DIAGRAM OLA
GRN/YEL
LIMIT
THERMOSTAT
BLU
SW. &
THERMOSTAT
BLK
TANK HEATER
L2
RED
WHI
"KEEP WARM" HEATER
IND
P3 P2
BLK
SW
BLK
BLK
P3
BLK
P1
BLU
P2
WHI
SOL
OPTIONAL LOW WATER PRESSURE VALVE
10651.0000B 10/98 © 1994 BUNN-O-MATIC CORPORATION
BLK
BLK
IND
BLK
BLK
PNK
BLK
BLU
WHI
WHI VIO
BLK
PNK
K1 N.O.
K1
BR. RECT
WHI/VIO
RED
UPPER WARMER
BREW STATION WARMER
SAFETY SWLEVEL SW
PNK
BLK
BLU
WHI
PNK BLK
P3
P1
P2 RED
SOL
BLK
BLU
BREW SW
P1, P2, & P3 ARE PINS OF A
POLARIZED THREE-PIN
220 -240 VOLTS AC
WHI
RED
RED
RED
CONNECTOR.
2 WIRE
SINGLE PHASE
50-60 HZ
Page 25
32430 121699
Page 26
SCHEMATIC WIRING DIAGRAM OL25B
L1
BLK
BLK
BLK
LIMIT
THERMOSTAT
PNK
BLK-12BLK-12
T1 L1
K2 N.O
SW. & THERMOSTAT
BLU
BLK
LEVEL SW
PNK
TANK HEATER
HEATER INDICATOR
BLK
BLK
BREW STATION WARMER
OVERFLOW
PROTECTION SW
PNK
PNK BLK
WHI-12
L2 T2
K2 N.O
K2
BREW SW
GRN/YEL
N
WHI-12
WHI
WHI
WHI
BLK
P3
BLK
BLU
P1
BLU
WHI
P2
SOL
P1, P2, & P3 ARE PINS OF A
P3
BLK BLK
WHI
POLARIZED THREE-PIN
CONNECTOR.
BLK
100 VOLTS AC
2 WIRE
SINGLE PHASE
50/60 HZ
10639.0000C 10/98 © 1991 Bunn-O-Matic Corporation
K1 N.O.
K1
BLK
BLU
P3
P2
WHI
WHI
UPPER WARMER
P1
BLK
BLU
P2 & P3 ARE PINS OF A
POLARIZED THREE-PIN
CONNECTOR.
WHI
P2
WHI
WHI
Page 26
32430 121699
Page 27
L1
SCHEMATIC WIRING DIAGRAM OL35B
READY INDICATOR
BLU
BLK
GREEN
L2
LIMIT
BLK
BLK BLK
BLK
THERMOSTAT
SW
P3 P2
SW
BLK PNK
P3
BLK
P1
BLU
P2
WHI
SOL
OPTIONAL LOW WATER PRESSURE VALVE
BLU
BLK
BLK
PNK
BLK
BLU
WHI
WHI VIO
BLK
SW. & THERMOSTAT
IND
BLK
IND
LEVEL SW
PNK
K1 N.O.
K1
BR. RECT
BLK
WHI
UPPER WARMER
BREW STATION WARMER
SAFETY SW
PNK
BLK
BLU
WHI
WHI/VIO
P3
P1
P2
SOL
TANK HEATER
BREW SW
BLK
BLK
BLU
P1, P2, & P3 ARE PINS OF A
POLARIZED THREE-PIN
P2 & P3 ARE PINS OF A
POLARIZED THREE-PIN
CONNECTOR.
WHI
CONNECTOR.
RED
RED
RED
RED
RED
200 VOLTS AC
2 WIRE
SINGLE PHASE
60 HZ
10641.0000B 10/98 © 1994 BUNN-O-MATIC CORPORATION
Page 27
32430 121699
Page 28
L1
BLK
SCHEMATIC WIRING DIAGRAM RL
GREEN
SW. &
LIMIT
THERMOSTAT
BLU
THERMOSTAT
BLK
TANK HEATER
"KEEP WARM" HEATER
N
L2
RED
WHIWHI
BLK
SOL
P3
BLK
P1
BLU
P2
WHI
OPTIONAL LOW WATER PRESSURE VALVE
OFF
L1 1
ON
OFF
BLK
BLK
BREW STATION WARMER
SAFETY SWLEVEL SW
PNK
PNKBLK PNK BLK
BLK
BLU
WHI
WHI VIO
BLK
ON
OFF
L1 1
ON
PNK
K1 N.O.
K1
BR. RECT
ON
BLK
BLU
WHI
WHI/VIO
OFF
P3
P1
P2 WHI
SOL
WHI
WHI
BREW SW
BLK
BLU
P1, P2, & P3 ARE PINS OF A
POLARIZED THREE-PIN
CONNECTOR.
WHIBLK BLK
LEFT REAR WARMER
WHIBLK BLK
LEFT FRONT WARMER
OFF
L1 1
BLK
ON
ON
OFF
120/240 VOLTS AC
3 WIRE
SINGLE PHASE
60 HZ
OFF
L1 1
OFF
ON
RIGHT FRONT WARMER
BLK
RIGHT REAR WARMER
ON
32424.0000A 10/99 © 1999 BUNN-O-MATIC CORPORATION
Page 28
WHIBLK BLK
WHI
32430 121699
Page 29
SCHEMATIC WIRING DIAGRAM RLA
GRN/YEL
LIMIT
THERMOSTAT
BLU BLKBLK
TANK HEATER
RED
L2L1
BLK
BLK
"KEEP WARM" HEATER
WHIWHI
RED
RED
220-240 VOLTS AC
2 WIRE
SINGLE PHASE
32422.0000A 10/99 © 1999 BUNN-O-MATIC CORPORATION
Page 29
Page 30
L1
SCHEMATIC WIRING DIAGRAM RL35B
LIMIT
BLK
THERMOSTAT
BLU
BLK
GREEN
L2
RED
BLK
SOL
BLK
BLK
PNKBLK PNK BLK
BLK
P3
BLK
BLU
P1
BLU
P2
WHI
OPTIONAL LOW WATER PRESSURE VALVE
WHI
WHI VIO
BLK
PNK
K1 N.O.
K1
BR. RECT
PNK
WHI/VIO
BLK
BLU
WHI
RED
RED
BREW SW
SAFETY SWLEVEL SW
P3
P1
P2
SOL
BLK
BLU
RED
P1, P2, & P3 ARE PINS OF A
REDBLK BLK
REDBLK BLK
REDBLK BLK
200 VOLTS AC
2 WIRE
SINGLE PHASE
60 HZ
32421.0000A 10/99 © 1999 BUNN-O-MATIC CORPORATION
Page 30
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