Despatch LBB 1-23B Installation Manual

LBB Series Oven Owner’s Manual ABOUT THIS MANUAL

ULTRAFLEX DRYING AND FIRING FURNACE

MODELS 1000, 3615, 3630, 3640

C-204 VERSION 15

10/2008

LBB SERIES OVEN OWNER’S MANUAL

C-188 PN 146230 VERSION 15 8/2012

Version 15 1

All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.

ABOUT THIS MANUAL LBB Series Oven Owner’s Manual

Revision

Date

Author

Description

C

Updated electrical drawings in DRAWINGS AND SPARE PARTS LISTS section.

D

Corrections.

E

Correction, page 19, set-up parameter table

F

Parts lists corrections in DRAWINGS AND SPARE PARTS LISTS section

G

Corrections to SPECIFICATIONS section, addition of options and features in APPENDIX

H

Change Product Warranty page

I

Update drawings and High Limit information

J

Parts lists corrections in DRAWING AND SPARE PARTS LISTS section. Corrected Despatch address.

K

Parts lists corrections in DRAWING AND SPARE PARTS LISTS section

L

Updated warranty

12

3/2011

Livingston

Revise format

13

9/2011

Livingston

Additional parts tables

14

6/2012

Livingston

Update for Protocol 3

15

8/2012

Livingston

Corrections—Power Section

2 Version 15

Revision History

All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.

LBB Series Oven Owner’s Manual ABOUT THIS MANUAL

Version 15 3

Figures

Figure 1. Disconnect Switch.......................................................................................................... 20

Figure 2. LBB Forced Convection Benchtop Oven. ..................................................................... 21

Figure 3. Horizontal Airflow through the LBB Oven. .................................................................. 21

Figure 4. LBB Series Oven Primary Control Instrument .............................................................. 22

Figure 5. Protocol 3 Operator Interface. ........................................................................................ 23

Figure 6. High Limit Instrument. .................................................................................................. 24

Figure 7. LBB Series Oven Name Plate. ....................................................................................... 27

Figure 8. LBB Series Oven with Top Removed. ........................................................................... 28

Figure 9. Wiring Access through Rear of Oven. ........................................................................... 28

Figure 10. Close-up of Connector Block. ...................................................................................... 28

Figure 11. LBB Series Oven Control Panel. ................................................................................. 32

Figure 12. Adjust Damper to Set Exhaust Vent by rotating the outer component. ....................... 32

Figure 13. Remove Control Panel to Access Control Instrument. ................................................ 46

Figure 14. Providing easy access to the Control instrument. ........................................................ 47

Figure 15. Remove Old Control and High Limit Instruments and Wiring (Rear View). .............. 47

Figure 16. Prepare to remove control instrument by removing the mounting bracket. ................. 48

Figure 17. Connections to Control Instrument. ............................................................................. 48

Figure 18. High Limit Connector Block on Control Board. .......................................................... 49

Figure 19. Press and Hold Tabs to Remove High Limit Instrument. ............................................ 50

Figure 20. Connections to High Limit Instrument. ....................................................................... 50

Figure 21. Connections to High Limit Instrument. ....................................................................... 50

Figure 22. Remove Screws to Remove Each Duct. ....................................................................... 51

Figure 23. Typical Heating Element. ............................................................................................ 52

Figure 24. Fan Motor Location and Close-up. .............................................................................. 53

Figure 25. Optional LBB Oven Stand. .......................................................................................... 57

Figure 26. Timer Option Displays and Switches. .......................................................................... 58

Figure 27. Stacking Kit Assembly Components. .......................................................................... 60

Figure 28. LBB1-23A-1 Schematic. .............................................................................................. 66

Figure 29. LBB1-23B-1 Schematic. .............................................................................................. 66

Figure 30. LBB1-43A-1 Schematic. .............................................................................................. 66

Figure 31. LBB1-43B-1 Schematic. .............................................................................................. 66

Figure 32. LBB1-69A-1 Schematic. .............................................................................................. 66

Figure 33. LBB1-69B-1 Schematic. .............................................................................................. 66

Figure 34. LBB2-12-1 Schematic. ................................................................................................. 66

Figure 35. LBB2-18-1 Schematic. ................................................................................................. 66

Figure 36. LBB2-27-1 Schematic. ................................................................................................. 66

Tables

Table 1. Operating/Environmental Conditions (For indoor use). .................................................. 14

Table 2. Control Instrument Explanations. .................................................................................... 23

Table 3. High Limit Instrument Explanations. .............................................................................. 24

Table 4. Control Instrument Operating Parameters. ...................................................................... 34

Table 5. Control Instrument Set-up Parameters. ........................................................................... 35

means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.

ABOUT THIS MANUAL LBB Series Oven Owner’s Manual

6 Version 15

Table 6. High Limit instrument Setup Parameters. ....................................................................... 39

Table 7. Common Technical Issues and Remedies. ...................................................................... 54

Table 8. LBB1-23A-1 Parts. .......................................................................................................... 61

Table 9. LBB1-23B-1 Parts. .......................................................................................................... 61

Table 10. LBB1-43A-1 Parts. ........................................................................................................ 62

Table 11. LBB1-43B-1 Parts. ........................................................................................................ 62

Table 12. LBB1-69A-1 Parts. ........................................................................................................ 63

Table 13. LBB1-69B-1 Parts. ........................................................................................................ 63

Table 14. LBB2-12-1 Parts............................................................................................................ 64

Table 15. LBB2-18-1 Parts............................................................................................................ 64

Table 16. LBB2-27-1 Parts............................................................................................................ 65

means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.

LAC Series Oven Owner’s Manual ABOUT THIS MANUAL



Values displayed on screens are examples only. Though those values may be typical, contact Despatch Industries for the final value.



Users of this equipment must comply with operating procedures and training of operation personnel as required by the Occupational Safety and Health Act (OSHA) of 1970, Section 5 and relevant safety standards, as well as other safety rules and regulations of state and local governments. Refer to the relevant safety standards in OSHA and National Fire Protection Association (NFPA), section 86 of 1990.

Version 15 7

1. About This Manual

1.1. Important User Information

Copyright © 2012 by Despatch Industries.

All rights reserved. No part of the contents of this manual may be reproduced, copied, or transmitted in any form or by any means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and retrieval systems without the written permission of the publisher, unless it is for the purchaser's personal use.

Printed and bound in the United States of America.

The information in this manual is subject to change without notice and does not represent a commitment on the part of Despatch Industries. Despatch Industries does not assume any responsibility for any errors that may appear in this manual.

In no event will Despatch Industries be liable for technical or editorial omissions made herein, nor for direct, indirect, special, incidental, or consequential damages resulting from the use or defect of this manual.

All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.

ABOUT THIS MANUAL LAC Series Oven Owner’s Manual

Danger!

Only fully-trained and qualified personnel should setup and maintain this equipment. Improper setup and operation of this equipment could cause an explosion that may result in equipment damage, personal injury or possible death.

Global Headquarters

Contact

Service & Technical Support

Despatch Industries

8860 207th Street Lakeville, MN 55044 USA

International/Main: 1-952-469-5424 US toll free: 1-888-337-7282 Fax: 1-952-469-4513 info@despatch.com www.despatch.com

Service: 1-952-469-8230 US toll free: 1-800-473-7373 Service @despatch.com

8 Version 15

The information in this document is not intended to cover all possible conditions and situations that might occur. The end user must exercise caution and common sense when installing or maintaining Despatch Industries products. If any questions or problems arise, call Despatch Industries at 1-888-DESPATCH or 1-952-469-5424.

1.2. Manufacturer & Service

The LBB Series oven is manufactured by Despatch Industries.

Despatch has specialized in thermal processing for over 100 years. Technical expertise gained over those years helps provide innovative solutions to critical applications in vertical markets and cutting edge technology worldwide. Despatch products are backed by a drive for long-term customer satisfaction and a strong sense of responsibility. The worldwide network of factorytrained Service Professionals is available to support your Despatch equipment. From full service preventive maintenance to routine repair and certified calibration and uniformity, the Despatch service network is positioned to respond to your business needs. Our service programs are customized to meet your specific needs using our Advantage Service Assurance Program (ASAP). For more information on ASAP, visit www.despatch.com.

1.3. Organization of this Manual

This owner’s manual contains the most comprehensive set of information for the Despatch LBB Series ovens, including installation instructions, theory of operation, operating instructions, among other things.

All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.

LAC Series Oven Owner’s Manual ABOUT THIS MANUAL

Danger!

Failure to heed warnings in this instruction manual and on the oven could result in personal injury, property damage or death.

This icon signifies information that describes an unsafe condition that may result in death, serious injury, or damage to the equipment.

Danger!

Danger is the signal word used to indicate a hazardous situation that, if not avoided, will result in death or severe injury.

Warning!

Warning is the signal word used to indicate a hazardous situation that, if not avoided, could result in death or severe injury.

Caution!

Caution is the signal word used to indicate a hazardous situation that, if not avoided, could result in moderate or minor injury.

Notice

Notice is the signal word used to indicate a hazardous situation that, if not avoided, could result in property damage.



This icon signifies supplemental important information.

LOG OUT

Bold, 10 point sans-serif typeface indicates a specific key or button on screen to click.

Version 15 9

1.4. Conventions

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ABOUT THIS MANUAL LAC Series Oven Owner’s Manual

LBB

Model

No.

Chamber Size

in (cm)

Capacity

feet

3

(liters)

Overall Size

in (cm)

Shelves

Provided

on Shelf

Centers

in (cm)

Maximum

Number of

Shelf

Positions

Chamber

Doors

W0 D H W D

H

1-23

18

(46)

18

(46)

12

(30)

2.3

(65)

24

(61)

23

(58)

26

(66)

2 on 2”

(5.1)

5

1

1-43

24

(61)

14

(36)

22

(56)

4.3

(122)

30

(76)

19

(48)

36

(91)

2 on 2”

(5.1)

10

1

1-69

30

(76)

18

(46)

22

(56)

6.9

(195)

34

(86)

23

(58)

36

(91)

2 on 2”

(5.1)

10

2

2-12

30

(76)

20

(51)

35

(89)

12.1

(343)

36

(91)

25

(64)

51

(130)

2 on 2”

(5.1)

16

2

2-18

37

(94)

24

(61)

35

(89)

18

(510)

43

(102)

29

(74)

51

(130)

2 on 2”

(5.1)

16

2

2-27

37

(94)

37

(94)

35

(89)

27.7

(785)

43

(102)

42

(107)

51

(130)

2 on 2”

(5.1)

16

2



The LBB oven is not intended to process solvents or other volatile or flammable materials. Oven exhaust is intended for cooling purposes only.

Warning!

Do not place this oven in an environment harmful to electrical components.

Placing this oven in an environment detrimental to electrical components (for example, environments where carbon fibers, coal dust or similar contaminants may be present) may result in component failure.

Do not use liquids in the oven. Do not set product or liquids on top of the oven. Liquids that may spill on the oven floor or top of oven may cause considerable damage to the oven.

Contact Despatch for options available to help prevent such failures.

10 Version 15

1.5. Specifications

1.5.1. Dimensions

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LAC Series Oven Owner’s Manual ABOUT THIS MANUAL

Capacity

LBB Model Number

1-23

1-43

1-69

2-12

2-18

2-27

Maximum Load

Lbs (Kg)

200

(91)

200

(91)

400

(181)

600

(272)

600

(272)

600

(272)

Maximum Shelf Load

Lbs (Kgs)

50

(23)

50

(23)

200*

(91)

200*

(91)

200*

(91)

200*

(91)

Exhaust Capacity

CFM (LPS)

1

(0.5) 2 (0.9)

3

(1.4)

12

(5.7)

14

(6.6)

14

(6.6)



Maximum load capacity not valid on ovens with the “control panel located on bottom” option.

*

Warning!

Do not exceed a total of 400 Lbs. (181 Kg) for stacked LBB1-69 ovens.

Version 15 11

1.5.2. Capacities

1.5.3. Power

If the line voltage for your LBB Series oven varies more than 10% from the oven voltage rating, electrical components such as relays and temperature controls may operate erratically.  If the line voltage is lower than the oven voltage rating, heat-up time may be significantly

longer and motors may overload or run hot

 If the line voltage is higher than the nameplate rating, motors may run hot and draw excessive

amperage

LBB1-69 and larger models have reinforced shelves. Standard duty (50 Lbs. maximum) shelves are also

available.

All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.

ABOUT THIS MANUAL LAC Series Oven Owner’s Manual

Model

Volts

Amps

Hertz

Phase

Heater

KW

Cord and Plug

LBB 1-23A

120

11.6

50/60 1 1.2

Included, 15 Amp

LBB 1-23B

240

5.8

50/60 1 1.2

Included, 15 Amp

LBB 1-43A

120

15.3

50/60 1 1.6

Included, 20 Amp

LBB 1-43B

240

7.7

50/60 1 1.6

Included, 15 Amp

LBB 1-69A†

120

21.6

50/60 1 2.4

None, Hardwired

LBB 1-69B†

240

10.8

50/60 1 2.4

None, Hardwired

LBB 2-12†

240

16.6

50/60 1 3.6

None, Hardwired

LBB 2-18†

240

16.7

50/60 1 3.6

None, Hardwired

LBB2-27†

240

21.7

50/60 1 4.8

None, Hardwired



Ovens designed for 240 volts (check your oven nameplate for power requirement) will operate satisfactorily on a minimum of 208 volts, but with a 25% reduction in heater power. If your power characteristics are lower, contact Despatch industries.

†

12 Version 15

Models LBB1-69, LBB2-12, -18 and -27 must be hardwired to the electric supply using 10 AWG or

larger wire suitable for at least 75 °C (167 °F).

All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.

LAC Series Oven Owner’s Manual ABOUT THIS MANUAL

Temperature and

Parameters

LBB Model Number

1-23

1-43

1-69

2-12

2-18

2-27

Time to temperature (approximate minutes with no load

40°C-

150°C

17

15

17

40°C-

204°C

30

26

30

33

Recovery time with door open 1 minute (approximates minutes with no load)

150°C 2 2 3 3 3 4

204°C 4 4 6 6 7 8

Temperature uniformity at:

150°C

+/- 3°C

+/- 2°C

+/- 3°C

204°C

+/- 4°C

+/- 3°C

+/- 4°C

Operating range with 20°C

ambient:

35°C- 204°C

40°C-204°C

Control Stability

± 0.5 °C



Dampers must be open to operate at the minimum temperature.



“Time to Temperature” and “Temperature Uniformity” values are based on 240V/60 Hz operation, with control panel located on top. Actual results may vary slightly depending on unit configuration and operating conditions.

Version 15 13

1.5.4. Temperature

All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.

ABOUT THIS MANUAL LAC Series Oven Owner’s Manual

Item

Description

Operating Temperature‡

18°C to 40°C (64.4°F to 104°F)

Relative Humidity

70% non‐condensing

Maximum Altitude

2,000 meters (6,600 feet)

‡

14 Version 15

1.5.5. LBB Series Oven Operating Conditions

The LBB Series oven is for indoor use. Table 1 provides the operating conditions.

Table 1. Operating/Environmental Conditions (For indoor use).

Fluctuations in temperature can occur at elevated ambient temperature values.

All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.

LBB Series Oven Owner’s Manual SAFETY



Carefully follow the established Lock Out Tag Out policies of your company in all cases.

Danger!

Electrical panels contain high voltage. Disconnect and lock out the power supply before working inside any electrical panels. Failure to lock out the power supply can result in death or injury.

Version 15 15

2. Safety

2.1. Safety Information

Do not work on the LBB Series oven without reading and understanding this section which contains important information and warnings. Ignoring these warnings can result in death, serious injury or damage to the machine and product.

2.1.1. Lockout

Machine lockout places the LBB Series oven into a zero energy state and prevents accidental machine start up. Always follow the Lockout Procedure described in this Section before cleaning, maintaining or repairing the LBB Series oven. An accidental start-up, while working on the LBB Series oven, can result in serious injury or death.

2.1.1.1. Lockout Requirements

1. Every power source that can energize any element of the LBB Series oven must be shut off at

the closest possible power source. This includes air, water and electricity, including the Disconnect Switch.

2. After energy sources are locked out, test to ensure circuits are de-energized.

2.1.1.2. Lockout Procedure

Personnel authorized to lockout equipment must have the necessary locks to perform the lockout.

1. Physically disconnect all electrical power to the machine or lockout the appropriate breaker

or disconnects.

2. Close all valves and bleed off any pressure.

3. Test for power by attempting a start with the machine controls.

4. Identify the Lockout Condition with a tag on the electrical disconnect and pneumatic shut off

valve.

5. When work is complete, remove all tags and restore the machine to its working state.

All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.

SAFETY LBB Series Oven Owner’s Manual

Caution!

Do not tilt oven while lifting. Do not lift oven using the door handle to prevent damage to the oven and/or personnel involved.

Caution!

Do not risk injury when lifting equipment. Take proper precautions when lifting, carrying or otherwise maintaining heavy items.

Notice

How to lift the different sizes of ovens:

 LBB1-12 & LBB1-43: Four people lift oven’s lower

corners and place on wheeled transport pallet. Push pallet to desired site and lift oven from pallet, again lift using lower corners.

 LBB1-69, LBB2-12, LBB2-18, LBB 2-27: Do not lift by

hand. Lift with fork lifter and transport pallet.

16 Version 15

2.2. Provisions for Lifting and Carrying

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LBB Series Oven Owner’s Manual SAFETY

Danger!

Contact with energized electrical sources may result in serious injury or death.

Warning!

Do not place this oven in an environment harmful to electrical components.

Placing this oven in an environment detrimental to electrical components (for example, environments where carbon fibers, coal dust or similar contaminants may be present) may result in component failure.

Contact Despatch for options available to help prevent such failures.

Version 15 17

2.3. Maintenance

Only qualified and trained personnel should perform maintenance or repair.

2.4. Electrical Power

Only qualified and trained personnel should perform electrical maintenance or electrical repair.

 Before performing maintenance, disconnect all electrical power from the machine. Use a

padlock and lockout all disconnects feeding power to the machine.

 Never clean or repair the oven when in operation.  Unauthorized alterations or modifications to LBB Series oven are strictly forbidden. Never

modify any electrical circuits. Unauthorized modifications can impair the function and safety of the LBB Series oven.

All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.

SAFETY LBB Series Oven Owner’s Manual

Danger!

Always disconnect all power before extinguishing a fire. Attempting to extinguish a fire in a machine connected to electrical power can result in serious injury or death!

Warning!

Do not place this oven in an environment harmful to electrical components.

Placing this oven in an environment detrimental to electrical components (for example, environments where carbon fibers, coal dust or similar contaminants may be present) may result in component failure.

Do not use liquids in the oven. Do not set product or liquids on top of the oven. Liquids that may spill on the oven floor or top of oven may cause considerable damage to the oven.

Contact Despatch for options available to help prevent such failures.

18 Version 15

2.5. Fire

Keep the LBB Series oven clean and free of scrap materials, oil or solvents to prevent the possibility of fire. In the event of fire, use a fire extinguisher as follows.

1. Leave door (s) as they are.

2. De-energize the machine immediately by turning OFF the DISCONNECT SWITCH.

3. Turn off the remote main disconnect (customer supplied disconnect).

4. Shut off fuel

5. Call the fire department or extinguish the fire.

2.6. Equipment Lockout Requirements

To prevent injury or equipment damage during inspection or repair, the LBB Series oven must be locked out.

2.6.1. Emergency Stop

When a risk of personal injury or damage to the LBB Series oven exists, turn OFF the oven by removing/unplugging the cord. This shuts off all electrical power to the oven.

All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.

LBB Series Oven Owner’s Manual SAFETY



Use a power stabilizer if voltage fluctuation is greater than ±10% nominal voltage fluctuation.



Follow local codes and requirements for installing and using disconnect switches.

Danger!

Keep switch or circuit-breaker in building installation, close to the equipment, within easy reach of the operator and clearly marked.

Version 15 19

2.7. Disconnecting Devices

2.7.1. Power Requirements

Despatch recommends the LBB Series Ovens have unobstructed access to a dedicated power source.

2.7.2. Disconnecting Hard-Wired Units

LBB permanently-connected (hard-wired) ovens include models LBB1-69, LBB2-12, LBB2-18 and LBB2-27. Permanently-connected and multi-phased equipment must employ a switch or circuit-breaker as means for disconnection. For permanently-connected equipment, installation instructions must specify a switch or circuit-breaker is included during the facility oven installation for complete isolation.

The disconnecting device must be installed in close proximity to the equipment and within easy reach of the operator. The disconnecting device must be marked as the disconnecting device for the equipment. If the unit is equipped with an ON/OFF switch, mark the ON/OFF position clearly.

2.7.3. Disconnecting Corded Units

LBB cord-connected ovens include models LBB1-21 and LBB1-43. To disconnect a corded unit, unplug the cord from the power source.

All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.

SAFETY LBB Series Oven Owner’s Manual

Figure 1. Disconnect Switch.

20 Version 15

2.7.4. Disconnecting Units with Optional Disconnect Switch

The LBB Series oven has an optional Disconnect Switch (Figure 1). This Disconnect Switch is located on the front of the oven and connected to the load break switch behind the panel that disconnects or connects power from the main line. When a risk of personal injury or damage to the LBB Series oven exists, turn off the Disconnect Switch. This shuts off all electrical power to the oven.

All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.

LBB Series Oven Owner’s Manual THEORY OF OPERATION

Exhaust

Heater

Recirculation Fan

Figure 2. LBB Forced Convection

Benchtop Oven.

Figure 3. Horizontal Airflow through the LBB Oven.

Version 15 21

3. Theory of Operation

3.1. The LBB Series Oven

The Despatch LBB Series ovens (Figure 2) effectively distribute heat with a processing time among the fastest of any lab oven its class. LBB Series ovens are effectively used in testing, preheating, sterilizing, drying, aging and curing as well as other production applications. The LBB Series ovens incorporate forced circulating airflow with precision digital control to deliver

fast processing. The overall result is efficient productivity under strenuous conditions.

The LBB Series ovens are precise and practical. The unique Despatch design moves convected heat through stainless steel ducts on each side of the oven (Figure 3). The air is circulated with a high volume fan. The LBB Series ovens employ higher volume fans than any competitive model. The chamber can be densely loaded without interfering with the process. For your convenience the fresh air intake is fixed. The exhaust rate is regulated by a damper on the back of the unit.

All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.

THEORY OF OPERATION LBB Series Oven Owner’s Manual

Warning!

Do not remove the hat bracket as it distributes exhaust air and protects the exhaust opening from being completely covered.

Figure 4. LBB Series Oven Primary Control Instrument

22 Version 15

3.1.1. Oven Theory

The LBB Series forced circulating oven uses fan to circulate air through the chamber. A circulating oven is much more efficient and uniform oven than a gravity-convection oven due to the constant air movement. Soaking at a desired setpoint still depends on a number of parameters including chamber area, load mass, the ability to absorb heat and the exhaust rate. But soak times with a forced circulating oven may be shortened. The LBB Series oven is capable of heating to 204°C (400°F). The oven uses a microprocessor-based digital control to display the actual chamber temperature at the sensing point. The temperature sensor is located to optimize control action for the entire chamber for various load conditions. The control display may fluctuate a few degrees around the setpoint, reflecting temperature changes at the sensor location. However, overall chamber temperature remains stable. The strategic location of the sensor compensates for delays in heat convection and enhances the performance and temperature control of the oven. The oven has been designed for an overall result of quality productivity where fast processing and versatility are critical.

3.2. Control Systems

3.2.1. Primary Control Instrument

The LBB Series oven is equipped with a microprocessor-based digital control instrument configured as a proportional controller and set to its optimum operating values (Figure 4). Initially the control instrument allows the heater to operate at full power. As the actual oven temperature reaches the setpoint, the control instrument cycles the heater on and off, minimizing process temperature fluctuations. Table 2 provides explanation for working with the control instrument.

All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.

LBB Series Oven Owner’s Manual THEORY OF OPERATION

Figure 5. Protocol 3 Operator Interface.

Display

Description

Main (PV) Display

Typically displays actual oven temperature. Press SET/ENT to display

setpoint. Displays parameter code and value.

Key

Press to switch between PV and SP displays. Enter data using or . Press repeatedly to switches through parameter displays.

Decrease setpoint or mode parameter

Increase setpoint or mode parameter

SP

Lit when setpoint value displays

OUT

Lit when control calls for heat

AL1 –2

N/A

Version 15 23

Table 2. Control Instrument Explanations.

3.3. The Protocol 3 Controller

The Protocol 3™ controller is a microprocessor based digital temperature controller designed for simple and flexible oven operation (Figure 5). The Protocol 3 controller operates as a dualfunctioning controller/High Limit instrument. The control portion utilizes a time proportioning voltage signal to control heating devices with minimal temperature fluctuations.

The High Limit portion protects the product and/or the oven from overheating. If the product being processed has a critical high temperature limit, the High Limit setpoint should be set to a temperature somewhat below the temperature at which the product could be damaged. If the product does not have a critical high temperature limit, the High Limit setpoint should be set 5 to 15 degrees higher than the maximum programmed setpoint at which the oven will operate.

The Protocol 3 controller provides three primary operating modes:

 Manual: Oven operates continuously at a fixed temperature until turned off.  Timer: Oven operates at a fixed temperature for a user-selected time period, and then

automatically turns off.

 Profile: Temperatures increase or decrease as defined by 255 segments that can be allocated

to 64 ramp and soak profiles. The profiles can be linked to provide additional temperature combinations.

Review the Protocol 3 Controller Owner’s Manual for more information.

All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.

Despatch LBB 1-23B Installation Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Revision History

Table of Contents

Figures

Tables

1. About This Manual

1.1. Important User Information

Copyright © 2012 by Despatch Industries.

Printed and bound in the United States of America.

1.2. Manufacturer & Service

1.3. Organization of this Manual

1.4. Conventions

1.5. Specifications

1.5.1. Dimensions

1.5.2. Capacities

1.5.3. Power

1.5.4. Temperature

1.5.5. LBB Series Oven Operating Conditions

Table 1. Operating/Environmental Conditions (For indoor use).

2. Safety

2.1. Safety Information

2.1.1. Lockout

2.1.1.1. Lockout Requirements

2.1.1.2. Lockout Procedure

2.2. Provisions for Lifting and Carrying

2.3. Maintenance

2.4. Electrical Power

2.5. Fire

2.6. Equipment Lockout Requirements

2.6.1. Emergency Stop

2.7. Disconnecting Devices

2.7.1. Power Requirements

2.7.2. Disconnecting Hard-Wired Units

2.7.3. Disconnecting Corded Units

2.7.4. Disconnecting Units with Optional Disconnect Switch

3. Theory of Operation

3.1. The LBB Series Oven

3.1.1. Oven Theory

3.2. Control Systems

3.2.1. Primary Control Instrument

Table 2. Control Instrument Explanations.

3.3. The Protocol 3 Controller

Review the Protocol 3 Controller Owner’s Manual for more information.