Bunn 1SH User Manual

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BUNN®

 

 

1SH & 2SH

 

 

STAND

 

OPERATING & SERVICE MANUAL

 

 

BUNN-O-MATICCORPORATION

 

 

POST OFFICE BOX 3227

 

 

SPRINGFIELD, ILLINOIS 62708-3227

 

 

PHONE: (217) 529-6601FAX: (217)529-6644

28342.0000D

8/00

©1997 Bunn-O-MaticCorporation

WARRANTY

Bunn-O-MaticCorp. (“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-wiregrounded service rated 120 volts ac, single phase, 90 watts total for the 1SH, 180 watts total for the 2SH, or2-wiregrounded 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-Maticequipment.

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-MaticTechnical 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 contact or a loose connection at a terminal or crimp.

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

Probable Cause

Server will not heat

1.

No power or incorrect voltage.

 

2.

Circuit breaker

3. Receptacle contact

4. Transformer

5. Rectifier

Remedy

Be sure the stand is connected to the power source.

A)Check and reset if necessary

B)Refer to Service - Circuit breaker for test procedures. See page 4

Clean or replace. See page 5

Refer to Service - Transformer for test procedures. See page 7

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.

P1402

FIG. 2 CIRCUIT BREAKER

Location

The circuit breaker(s) is located on the upper part of the receptacle bracket just above the spring contact receptacle(s) assembly.

P1402

FIG. 1 COMPONENT ACCESS

Page 4

CT

h

e

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

 

BLU/BLK to Rectifier "AC"

 

FIG. 3 CIRCUIT BREAKER TERMINALS

P1330

 

RECEPTACLE ASSEMBLY (SPRING CONTACT)

P1402

FIG. 4 RECEPTACLE ASSEMBLY

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.

Removal and Replacement:

1.Disconnect the stand from the power source.

2.Disconnect the wires from the receptacle assembly.

3.Remove the two #6-32flat 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 #6-32flat head screws..

6.Refer to Fig. 5 and reconnect the wires.

BLK to (-)Terminal on Rectifier

RED to (+) Terminal on Rectifier

P1380

FIG. 5 RECEPTACLE TERMINALS

Page 5

28342 091597

 

SERVICE (cont.)

RECTIFIERS (cont.)

RECTIFIER

Removal and Replacement:

 

1

Disconnect the wires from the rectifier.

 

2.

Remove the #6-32truss 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 #6-32truss head screw.

1 2 3 4 5 6

5.

Refer to Fig 7 and reconnect the wires.

 

 

RED to Right Receptacle Terminal

 

 

BLU/BLK to Transformer #7

 

 

BLU/BLK to Circuit Breaker

 

 

BLK to Left Receptacle Terminal

A C +

A

C

FIG. 6 RECTIFIER

P1403.40

FIG. 7 RECTIFIER TERMINALS

P1381

 

 

 

 

 

 

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

28342 061598

 

423516

2

3

4

5

6

SERVICE (cont.)

TRANSFORMER

 

6

 

5

 

4

 

3

 

2

 

1

 

6

 

5

 

4

 

3

 

2

 

1

 

6

 

5

 

4

 

3

 

2

 

1

 

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.

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.

If voltage is present as described the transformer is operating properly.

If voltage is not present as described, replace the transformer.

Removal and Replacement:

1.Disconnect all the wires from the transformer.

2.Remove the four #6-32screws 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 #6-32screws and mounting strap.

5.Refer to Fig. 9 when reconnecting the wires.

Page 7

28342 061598

 

SERVICE (cont.)

TRANSFORMER (cont.)

Page 8

SCHEMATIC WIRING DIAGRAM

 

 

1 SH STAND

+

GRN

N

L1

Front view of Server Contacts

 

 

TRANSFORMER

 

 

 

 

BLK

1

12 BLU/BLK

BLU/BLK

 

24VDC

 

 

 

4

 

+

 

 

 

AMP

 

WHI

2

 

 

 

 

 

AC

BLK

 

 

 

 

 

 

 

 

 

 

 

 

 

+

RECT

 

 

 

 

 

AC

 

 

 

 

 

 

 

 

120 VOLTS AC, 2 WIRE

5

 

 

 

 

 

 

BLU/BLK

BLU/BLK

 

 

SINGLE PHASE

 

RED

 

6

7

 

 

 

 

 

 

 

SCHEMATIC WIRING DIAGRAM

 

 

 

+

 

N

L1

GRN

 

 

2 SH STAND

 

 

Front view of Server Contacts

 

 

 

 

 

 

 

 

 

 

 

 

TRANSFORMER

 

 

 

 

 

 

 

 

BLK

 

1

12

BLU/BLK

BLU/BLK

 

24VDC

24VDC

 

 

 

 

 

4

 

 

+

+

 

 

 

 

 

AMP

 

 

 

WHI

 

2

 

 

 

 

 

 

 

 

 

 

 

AC

BLK

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+

RECT

 

 

 

 

 

 

 

 

 

 

AC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

 

 

 

 

 

 

 

 

 

 

 

 

 

BLU/BLK

BLU/BLK

RED

 

 

 

 

 

 

6

7

 

 

 

 

 

 

 

 

 

 

TRANSFORMER

 

 

 

 

 

 

 

 

 

 

1

12

BLU/BLK

BLU/BLK

 

 

 

 

 

 

 

 

 

 

4

 

 

 

 

 

 

 

 

 

2

 

AMP

 

 

 

 

 

 

 

 

 

 

 

AC

BLK

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

120 VOLTS AC, 2 WIRE

 

 

 

+

RECT

 

 

 

 

 

BLK

 

 

AC

 

 

 

 

 

 

 

 

 

 

 

 

 

SINGLE PHASE

 

5

 

 

 

 

 

 

 

 

 

 

WHI

 

BLU/BLK

BLU/BLK

 

 

 

 

 

 

 

 

RED

 

 

 

 

 

 

6

7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Page 9

28342 071599

 

SCHEMATIC WIRING DIAGRAM

1 SH STAND, 230V CE

GRN/YEL

L2

L1

 

 

 

 

 

 

TRANSFORMER

 

 

BRN

1

12

BLU/BLK

 

 

 

 

4

 

BLU

2

11

AMP

 

 

 

 

BLK

 

RESETTABLE

230 VOLTS AC, 2 WIRE

5

8

FUSE

 

 

BLU/BLK

 

SINGLE PHASE

6

7

 

 

 

+

 

 

Front view of Server Contacts

BLU/BLK

 

24VDC

 

 

+

AC

BLK

 

 

 

+

RECT

 

 

AC

 

 

 

 

 

BLU/BLK

RED

 

 

 

 

27789.0001D 11/98 © 1997 BUNN-O-MATICCORPORATION

 

 

GRN/YEL

 

SCHEMATIC WIRING DIAGRAM

L2

L1

 

2 SH STAND, 230V CE

 

 

 

 

 

 

 

+

Front view of Server Contacts

 

 

 

TRANSFORMER

 

 

 

 

 

 

 

BRN

 

1

12

BLU/BLK

BLU/BLK

 

24VDC

24VDC

 

 

 

 

 

4

 

+

+

 

 

 

11

 

AMP

 

BLU

 

2

 

 

 

 

 

 

 

 

AC

BLK

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RESETTABLE

+

RECT

 

 

 

 

 

BLK

 

 

AC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

8

FUSE

 

 

 

 

 

 

 

 

 

 

BLU/BLK

BLU/BLK

RED

 

 

 

 

 

6

7

 

 

 

 

 

 

 

 

 

TRANSFORMER

 

 

 

 

 

 

 

 

BRN/BLK

1

12

BLU/BLK

BLU/BLK

 

 

 

 

 

 

 

 

 

 

4

 

 

 

 

 

 

 

2

11

 

AMP

 

 

 

 

 

 

 

 

AC

BLK

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

230 VOLTS AC, 2 WIRE

 

 

 

RESETTABLE

+

RECT

 

 

 

 

BLK

 

 

AC

 

 

 

 

 

 

 

 

 

 

 

5

8

FUSE

 

 

 

 

 

SINGLE PHASE

 

 

 

 

 

 

 

BLU

 

 

BLU/BLK

BLU/BLK

 

 

 

 

 

 

 

RED

 

 

 

 

 

6

7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

27793.0001C 11/98 © 1997 BUNN-O-MATICCORPORATION

Page 10

28342 071599