BUNN
®
1SH & 2SH
STAND
OPERATING & SERVICE MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
28342.0000D 8/00 ©1997 Bunn-O-Matic Corporation
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.
USER NOTICES
The notice on the stands should be kept in good condition. Replace if unreadable or damaged.
00986.0000
Page 2
ELECTRICAL REQUIREMENTS
The stands have an attached cordset and requires 2-wire grounded service rated 120 volts ac, single phase,
90 watts total for the 1SH, 180 watts total for the 2SH, or 2-wire grounded service rated 230 volts ac, single phase,
90 watts total for the 1SH, 180 watts total for the 2SH.
CLEANING
The use of a damp cloth rinsed in any mild, nonabrasive, liquid detergent is recommended for cleaning all
surfaces on Bunn-O-Matic equipment.
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.
•
•
•
WARNING
•
•
•
•
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 contact or a loose
connection at a terminal or crimp.
Exercise extreme caution when servicing electrical equipment.
Disconnect power source when servicing, except when electrical tests are specified.
Follow recommended service procedures.
Replace all protective shields or safety notices.
Problem
Probable Cause
Remedy
Server will not heat
1. No power or incorrect voltage.
Be sure the stand is connected to
the power source.
2. Circuit breaker
A) Check and reset if necessary
B) Refer to Service - Circuit breaker
for test procedures. See page 4
3. Receptacle contact
Clean or replace. See page 5
4. Transformer
Refer to Service - Transformer for
test procedures. See page 7
5. Rectifier
Refer to Service - Rectifier for test
procedures. See page 6
Page 3
28342 071599
SERVICE
This section provides procedures for testing and
replacing various major components used in these
stands should service become necessary. Refer to
Troubleshooting for assistance in determining the
cause of any problem.
WARNING - Inspection, testing, and repair of electrical equipment should be performed only by qualified
service personnel. The stands should be unplugged
when servicing, except when electrical tests are required and the test procedure specifically states to
connect the stand to the power source.
CIRCUIT BREAKER
COMPONENT ACCESS
WARNING - Disconnect the stand from the power
source before the removal of any panel or the replacement of any component.
All components are accessible by the removal of
the receptacle cover and the stand cover.
FIG. 2 CIRCUIT BREAKER
P1402
Location
The circuit breaker(s) is located on the upper
part of the receptacle bracket just above the spring
contact receptacle(s) assembly.
FIG. 1 COMPONENT ACCESS
P1402
Page 4
RECEPTACLE ASSEMBLY (SPRING CONTACT)
SERVICE (cont.)
Test Procedures
1. Disconnect the stand from the power source.
2. Remove the wires from the circuit breaker.
3. Check for continuity between the circuit breaker
terminals. Continuity must be present between the
terminals.
If continuity is present as described the circuit breaker
is functioning properly.
If continuity is not present as described, press reset
button and repeat step #3, if continuity is not present
as described, replace the circuit breaker.
Removal and Replacement:
1. Remove the wires from the circuit breaker.
2. Compress the clips on the back side of the receptacle bracket and gently push the circuit breaker
through the opening in the receptacle bracket.
3. Push the new circuit breaker into the opening in
the receptacle bracket until the clips snap into
position.
4. Reconnect the wires to the circuit breaker.
5. Refer to Fig. 3 when reconnecting the wires.
BLU/BLK to Transformer #12
FIG. 4 RECEPTACLE ASSEMBLY
P1402
Location:
The receptacle assembly is located on the lower
front of the receptacle bracket just below the circuit
breaker.
Test Procedures:
1. Clean or replace spring contacts.
BLU/BLK to Rectifier "AC"
FIG. 3 CIRCUIT BREAKER TERMINALS
P1330
Removal and Replacement:
1. Disconnect the stand from the power source.
2. Disconnect the wires from the receptacle assembly.
3. Remove the two #6-32 flat head screws securing
the receptacle to the receptacle bracket.
4. Remove and discard receptacle.
5. Install new receptacle in the receptacle bracket
and secure with two #6-32 flat head screws..
6. Refer to Fig. 5 and reconnect the wires.
BLK to (-) Terminal on Rectifier
RED to (+) Terminal on Rectifier
FIG. 5 RECEPTACLE TERMINALS
Page 5
P1380
28342 091597
RECTIFIERS (cont.)
SERVICE (cont.)
RECTIFIER
1
2 3 4 5
6
Removal and Replacement:
1 Disconnect the wires from the rectifier.
2. Remove the #6-32 truss head screw securing the
rectifier to the stand housing.
3. Remove the rectifier and discard.
4. Install new rectifier in the stand housing and
secure with a #6-32 truss head screw.
5. Refer to Fig 7 and reconnect the wires.
A
+
C
A
C
FIG. 6 RECTIFIER
FIG. 7 RECTIFIER TERMINALS
P1403.40
Location:
The rectifier(s) is located inside on the right side of
the stand housing just to the right of the transformer
for 1SH Stand and on the right and left side of the stand
housing for 2SH Stand.
Test Procedures:
1. Disconnect the stand from the power source.
2. Remove the red wire and the black wire from the
rectifier.
3. Check the voltage across the (+) and (-) terminals
on the rectifier with a voltmeter. Connect the stand
to the power source. The indication must be 24
volts dc.
4. Disconnect the stand from the power source.
If voltage is present as described, the rectifier is
operating properly.
If voltage is not present as described, refer to the stand
wiring diagrams and check the stand wiring harness.
Page 6
P1381
SERVICE (cont.)
TRANSFORMER
5. Disconnet the blue/black wires from terminals #7
and #12 on the transformer.
6. Check the voltage across terminal #7 and #12 of
the transformer with a voltmeter. Connect the
stand to the power source. The indication must be
24 volts ac.
1 2 3 4 5
6
If voltage is present as described the transformer is
operating properly.
If voltage is not present as described, replace the
transformer.
1 2 3 4 5
6
1 2 3 4 5
6
Removal and Replacement:
1. Disconnect all the wires from the transformer.
2. Remove the four #6-32 screws securing the transformer and mounting strap to the stand housing.
3. Remove transformer and discard.
4. Install new transformer in the stand housing securing with four #6-32 screws and mounting strap.
5. Refer to Fig. 9 when reconnecting the wires.
FIG. 8 TRANSFORMER
P1403.40
Location:
The transformer(s) is located in the stand housing
on the base plate.
Test Procedures:
1. Disconnect the stand from the power source.
2. Disconnect the black wire from terminal #5 and the
white or red wire from terminal # 6.
3. Check the voltage across the black and white or red
wire with a voltmeter. Connect the stand to the
power supply. The indication must be:
a.) 120 volts ac for two wire 120 volt models.
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models.
4. Disconnect the stand from the power supply.
If voltage is present as described reconnect the wires
and proceed to #5.
If voltage is not present as described, refer to the
wiring diagrams and check the stand wiring harness.
Page 7
28342 061598
SERVICE (cont.)
TRANSFORMER (cont.)
Page 8
GRN
N
SCHEMATIC WIRING DIAGRAM
1 SH STAND
–
+
L1
Front view of Server Contacts
TRANSFORMER
BLK
1
WHI
2
12
BLU/BLK
4
AMP
BLU/BLK
24VDC
BLK
AC
–
RECT
+
AC
5
120 VOLTS AC, 2 WIRE
SINGLE PHASE
N
L1
+
–
BLU/BLK
BLU/BLK
RED
7
6
SCHEMATIC WIRING DIAGRAM
2 SH STAND
GRN
–
+
Front view of Server Contacts
TRANSFORMER
12
1
BLK
BLU/BLK
2
WHI
4
AMP
BLU/BLK
AC
–
RECT
+
AC
24VDC
24VDC
–
–
+
+
BLK
5
BLU/BLK
BLU/BLK
RED
7
6
TRANSFORMER
1
12
BLU/BLK
2
120 VOLTS AC, 2 WIRE
SINGLE PHASE
4
AMP
BLU/BLK
AC
–
RECT
+
AC
BLK
BLK
5
BLU/BLK
WHI
6
BLU/BLK
RED
7
Page 9
28342 071599
SCHEMATIC WIRING DIAGRAM
1 SH STAND, 230V CE
L2
–
+
GRN/YEL
L1
Front view of Server Contacts
TRANSFORMER
BRN
1
12
BLU
2
11
230 VOLTS AC, 2 WIRE
SINGLE PHASE
BLK
5
8
6
7
BLU/BLK
4
AMP
BLU/BLK
24VDC
AC
–
RECT
+
AC
RESETTABLE
FUSE
BLU/BLK
+
–
BLK
BLU/BLK
RED
27789.0001D 11/98 © 1997 BUNN-O-MATIC CORPORATION
L2
L1
SCHEMATIC WIRING DIAGRAM
2 SH STAND, 230V CE
GRN/YEL
–
+
Front view of Server Contacts
TRANSFORMER
BRN
BLU
1
12
2
11
BLU/BLK
4
AMP
BLU/BLK
AC
BLK
5
8
6
7
–
RECT
+
AC
RESETTABLE
FUSE
24VDC
24VDC
–
–
+
+
BLK
BLU/BLK
BLU/BLK
RED
TRANSFORMER
BRN/BLK
230 VOLTS AC, 2 WIRE
SINGLE PHASE
1
12
2
11
BLU/BLK
4
AMP
BLU/BLK
AC
BLK
5
8
6
7
BLU
RESETTABLE
FUSE
BLU/BLK
–
RECT
+
AC
BLK
BLU/BLK
RED
27793.0001C 11/98 © 1997 BUNN-O-MATIC CORPORATION
Page 10
28342 071599
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