Despatch LBB Series User manual

LBB Series Oven Owner’s Manual ABOUT THIS MANUAL
Version 13 1
Copyright © 2011 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 Despatch Industries, unless for purchaser's personal use.
ULTRAFLEX DRYING AND FIRING
FURNACE
MODELS 1000, 3615, 3630, 3640
OWNERS MANUAL
C-204
VERSION 12
10/2008
LBB SERIES OVEN
OWNER’S MANUAL
C-188
PN 146230
VERSION 13
9/2011

ABOUT THIS MANUAL LBB Series Oven Owner’s Manual
2 Version 13
Copyright © 2011 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 Despatch Industries, unless for purchaser's personal use.
Revision History
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 hi-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
K. Livingston
Revise format
13
9/2011
K. Livingston
Additional Parts tables

LBB Series Oven Owner’s Manual ABOUT THIS MANUAL
Version 13 3
Copyright © 2011 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 Despatch Industries, unless for purchaser's personal use.
Table of Contents
1. About This Manual................................................................................................. 8
1.1. Important User Information.......................................................................... 8
1.2. Manufacturer & Service................................................................................ 9
1.3. Organization of this Manual ......................................................................... 9
1.4. Conventions ................................................................................................ 10
1.5. Specifications.............................................................................................. 11
1.5.1. Dimensions.............................................................................................. 11
1.5.2. Capacities................................................................................................ 12
1.5.3. Power....................................................................................................... 13
1.5.4. Temperature ............................................................................................ 14
2. Safety .................................................................................................................... 15
2.1. Safety Information...................................................................................... 15
2.1.1. Lockout.................................................................................................... 15
2.1.1.1. Lockout Requirements......................................................................... 15
2.1.1.2. Lockout Procedure............................................................................... 15
2.2. Maintenance................................................................................................ 16
2.3. Electrical Power.......................................................................................... 16
2.4. Fire.............................................................................................................. 17
2.5. Equipment Lockout Requirements ............................................................. 17
2.5.1. Emergency Stop ...................................................................................... 17
3. Theory of Operation.............................................................................................. 19
3.1. The LBB Series Oven................................................................................. 19
3.1.1. Oven Theory............................................................................................ 20
3.2. Control Systems.......................................................................................... 20
3.2.1. Primary Control Instrument .................................................................... 20
3.2.2. Optional Protocol Plus Controller........................................................... 22
3.2.3. Hi-Limit Instrument ................................................................................ 22
3.2.3.1. Product Hi-Limit Instrument............................................................... 23
3.2.3.2. Oven Hi-Limit Instrument................................................................... 23
4. Assembly & Setup ................................................................................................ 24
4.1. Unpack & Inspect the LBB Series Oven .................................................... 24
4.1.1. If Damaged During Shipping.................................................................. 24
4.2. Set-up the LBB Series Oven....................................................................... 24
4.2.1. Select Oven Location/Operating Environment....................................... 24
4.2.2. Set-up Procedure..................................................................................... 25
4.2.3. Wiring & Power Connections................................................................. 26
5. Operation............................................................................................................... 28
5.1. Load Oven................................................................................................... 28
5.2. Pre-Startup Checklist.................................................................................. 29
5.3. Operating Procedure ................................................................................... 30
5.3.1. Start Oven................................................................................................ 30
5.4. Working with the Control Instrument......................................................... 32
5.4.1. Change Setpoint ...................................................................................... 32

ABOUT THIS MANUAL LBB Series Oven Owner’s Manual
4 Version 13
Copyright © 2011 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 Despatch Industries, unless for purchaser's personal use.
5.4.2. Control Instrument Parameter Programming Mode................................ 33
5.4.2.1. Entering Control Instrument Operating and Set-up Mode .................. 33
5.4.2.2. Control Instrument Operating Mode Notes......................................... 34
5.4.3. Change Control Instrument Display from Centigrade to Fahrenheit...... 35
5.4.4. Oven Zone Calibration............................................................................ 36
5.4.5. Set the Hi-Limit....................................................................................... 37
5.4.5.1. Change the Hi-Limit Instrument Setpoint ........................................... 37
5.4.6. Hi-Limit Instrument Parameter Setup Mode........................................... 38
5.4.7. Hi-Limit Instrument Setup Parameters ................................................... 38
5.4.8. Change Hi-Limit instrument Display from Centigrade to Fahrenheit ... 39
5.5. Working with Optional Protocol Plus Controller Operating Modes .......... 40
6. Maintenance.......................................................................................................... 41
6.1. Checklist ..................................................................................................... 41
6.2. Lubrication.................................................................................................. 42
6.3. Routine Tests .............................................................................................. 42
6.3.1. Test Control Instrument .......................................................................... 42
6.3.2. Test Hi-Limit Instrument ........................................................................ 42
6.4. Replacement Parts....................................................................................... 42
6.4.1. Replace the Control Instrument............................................................... 43
6.4.2. Replace Hi-Limit Instrument .................................................................. 46
6.4.3. Replace (Optional) Protocol Plus Controller .......................................... 49
6.4.4. Replace Heater Unit................................................................................ 49
6.4.5. Replace Fan Motor.................................................................................. 51
7. Troubleshooting.................................................................................................... 53
8. Appendices............................................................................................................ 55
8.1. Standard Products Warranty....................................................................... 55
8.2. Optional Equipment.................................................................................... 56
8.2.1. Assemble Oven Stand ............................................................................. 56
8.2.2. Timer Option........................................................................................... 57
8.2.2.1. Operating the Timer............................................................................. 57
8.2.2.2. Configure the Timer ............................................................................ 58
8.2.3. Timer Option with Audible and Visual Alarm........................................ 58
8.2.4. High Alarm Limit Option........................................................................ 59
8.2.5. Recorder Option...................................................................................... 59
8.2.6. Stacking Kit Assembly Instructions (Only for models LBB1-23, LBB1-
43 and LBB1-69 ) ................................................................................................. 59
8.3. Part Lists ..................................................................................................... 61
8.3.1. LBB1-23A-1............................................................................................ 61
8.3.2. LBB1-23B-1............................................................................................ 61
8.3.3. LBB1-43A-1............................................................................................ 62
8.3.4. LBB1-43B-1............................................................................................ 62
8.3.5. LBB1-69A-1............................................................................................ 63
8.3.6. LBB1-69B-1............................................................................................ 63
8.3.7. LBB2-12-1 .............................................................................................. 64
8.3.8. LBB2-18-1 .............................................................................................. 64
8.3.9. LBB2-27-1 .............................................................................................. 65

LBB Series Oven Owner’s Manual ABOUT THIS MANUAL
Version 13 5
Copyright © 2011 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 Despatch Industries, unless for purchaser's personal use.
8.4. Electrical Schematics.................................................................................. 66
Figures
Figure 1. LBB Forced Convection Benchtop Oven.......................................................... 19
Figure 2. Horizontal Airflow through the LBB Oven....................................................... 19
Figure 3. LBB Series Oven Primary Control Instrument ................................................. 21
Figure 4. Protocol Plus Displays and Control Buttons..................................................... 22
Figure 5. Hi-Limit Instrument........................................................................................... 23
Figure 6. LBB Series Oven Name Plate. .......................................................................... 26
Figure 7. LBB Series Oven with Top Removed............................................................... 27
Figure 8. Wiring Access through Rear of Oven. .............................................................. 27
Figure 9. Close-up of Connector Block............................................................................ 27
Figure 10. LBB Series Oven Control Panel...................................................................... 31
Figure 11. Adjust Damper to Set Exhaust Vent by rotating the outer component. .......... 31
Figure 12. Remove Control Panel to Access Control Instrument..................................... 44
Figure 13. Providing easy access to the Control instrument............................................. 44
Figure 14. Remove Old Control and Hi-Limit Instruments and Wiring (Rear view)....... 45
Figure 15. Prepare to remove control instrument by removing the mounting bracket..... 45
Figure 16. Connections to Control Instrument. ................................................................ 46
Figure 17. Hi-Limit Connector Block on Control Board.................................................. 47
Figure 18. Press and Hold Tabs to Remove Hi-Limit Instrument.................................... 47
Figure 19. Connections to Hi-Limit Instrument. .............................................................. 48
Figure 20. Connections to Hi-Limit Instrument. .............................................................. 48
Figure 21. Remove Screws to Remove Each Duct........................................................... 49
Figure 22. Typical Heating Element................................................................................. 51
Figure 23. Fan Motor Location and Close-up................................................................... 52
Figure 24. Optional LBB Oven Stand............................................................................... 56
Figure 25. Timer Option Displays and Switches.............................................................. 57
Figure 26. Stacking Kit Assembly Components............................................................... 60
Figure 27. LBB1-23A-1 Schematic.................................................................................. 67
Figure 28. LBB1-23B-1 Schematic. ................................................................................. 67
Figure 29. LBB1-43A-1 Schematic.................................................................................. 67
Figure 30. LBB1-43B-1 Schematic. ................................................................................. 67
Figure 31. LBB1-69A-1 Schematic.................................................................................. 67
Figure 32. LBB1-69B-1 Schematic. ................................................................................. 67
Figure 33. LBB2-12-1 Schematic..................................................................................... 67
Figure 34. LBB2-18-1 Schematic..................................................................................... 67
Figure 35. LBB2-27-1 Schematic..................................................................................... 67
Tables
Table 1. Control Instrument Explanations........................................................................ 21
Table 2. Hi-Limit Instrument Explanations...................................................................... 23
Table 3. Control Instrument Operating Parameters.......................................................... 33
Table 4. Control Instrument Set-up Parameters................................................................ 34

ABOUT THIS MANUAL LBB Series Oven Owner’s Manual
6 Version 13
Copyright © 2011 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 Despatch Industries, unless for purchaser's personal use.
Table 5. Hi-Limit instrument Setup Parameters............................................................... 39
Table 6. Common Technical Issues and Remedies. ......................................................... 53

LBB Series Oven Owner’s Manual ABOUT THIS MANUAL
Version 13 7
Copyright © 2011 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 Despatch Industries, unless for purchaser's personal use.

ABOUT THIS MANUAL LBB Series Oven Owner’s Manual
8 Version 13
Copyright © 2011 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 Despatch Industries, unless for purchaser's personal use.
1. About This Manual
1.1. Important User Information
Copyright © 2011 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.

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 6 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.

LBB Series Oven Owner’s Manual ABOUT THIS MANUAL
Version 13 9
Copyright © 2011 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 Despatch Industries, unless for purchaser's personal use.
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.
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 factory-trained 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.
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: [phone]
[email protected]
www.despatch.com
Service: 1-952-469-8230
US toll free: 1-800-473-7373
Service @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.

ABOUT THIS MANUAL LBB Series Oven Owner’s Manual
10 Version 13
Copyright © 2011 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 Despatch Industries, unless for purchaser's personal use.
Danger!
Failure to heed warnings in this instruction manual and on the
oven could result in personal injury, property damage or death.
1.4. Conventions

This icon signifies important information.
This icon signifies information that describes an unsafe condition
that may result in death, serious injury, or damage to the
equipment.
Danger!
A condition that may result in death, serious injury, or damage to
equipment.
Warning!
Acondition that may result in serious injury or damage to
equipment.
Caution!
A condition that may result in damage to equipment or product.
LOG OUT
Reversed-out, Bold, 10pt Arial typeface indicates a specific key or
button on screen to click.

LBB Series Oven Owner’s Manual ABOUT THIS MANUAL
Version 13 11
Copyright © 2011 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 Despatch Industries, unless for purchaser's personal use.
1.5. Specifications
1.5.1. Dimensions
LBB
Model
No.
Chamber Size
in (cm)
Capacity
feet3
(liters)
Overall Size
in (cm)
Shelves
Provided
on Shelf
Centers
in (cm)
Maximum
Number of
Shelf
Positions
Chamber
Doors
W0F
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.
Contact Despatch for options available to help prevent such
failures.

ABOUT THIS MANUAL LBB Series Oven Owner’s Manual
12 Version 13
Copyright © 2011 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 Despatch Industries, unless for purchaser's personal use.
1.5.2. Capacities
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.
*LBB1-69 and larger models have reinforced shelves. Standard duty (50 Lbs. maximum) shelves are also
available.
Warning!
Do not exceed a total of 400 Lbs. (181 Kg) for stacked LBB1-
69 ovens.

LBB Series Oven Owner’s Manual ABOUT THIS MANUAL
Version 13 13
Copyright © 2011 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 Despatch Industries, unless for purchaser's personal use.
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
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
15.0
50/60
1
1.6
Included, 20 Amp
LBB 1-43B
240
7.5
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
16.4
50/60
1
3.6
None, Hardwired
LBB 2-18†
240
16.4
50/60
1
3.6
None, Hardwired
LBB2-27†
240
21.4
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.
†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).

ABOUT THIS MANUAL LBB Series Oven Owner’s Manual
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Copyright © 2011 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 Despatch Industries, unless for purchaser's personal use.
1.5.4. Temperature
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
17
15
15
17
17
40°C-
204°C
30
30
26
30
33
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
+/- 3°C
+/- 3°C
+/- 2°C
+/- 3°C
+/- 3°C
204°C
+/- 4°C
+/- 4°C
+/- 4°C
+/- 3°C
+/- 4°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.

LBB Series Oven Owner’s Manual SAFETY
Version 13 15
Copyright © 2011 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 Despatch Industries, unless for purchaser's personal use.
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

Carefully follow the established Lock Out Tag Out policies of
your company in all cases.
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.
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.

SAFETY LBB Series Oven Owner’s Manual
16 Version 13
Copyright © 2011 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 Despatch Industries, unless for purchaser's personal use.
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.
2.2. Maintenance
Only qualified and trained personnel should perform maintenance or repair.
2.3. Electrical Power
Only qualified and trained personnel should perform electrical maintenance or electrical
repair.
Danger!
Contact with energized electrical sources may result in serious
injury or death.
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.
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.

LBB Series Oven Owner’s Manual SAFETY
Version 13 17
Copyright © 2011 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 Despatch Industries, unless for purchaser's personal use.
2.4. 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.
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!
2.5. Equipment Lockout Requirements
To prevent injury or equipment damage during inspection or repair, the LBB Series Oven
must be locked out.
2.5.1. 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.
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.

SAFETY LBB Series Oven Owner’s Manual
18 Version 13
Copyright © 2011 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 Despatch Industries, unless for purchaser's personal use.

LBB Series Oven Owner’s Manual THEORY OF OPERATION
Version 13 19
Copyright © 2011 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 Despatch Industries, unless for purchaser's personal use.
Exhaust
Heater
Recirculation Fan
3. Theory of Operation
3.1. The LBB Series Oven
The Despatch LBB Series Ovens (Figure 1) 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 2). 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.
Figure 1. LBB Forced Convection
Benchtop Oven.
Figure 2. Horizontal Airflow through the
LBB Oven.

THEORY OF OPERATION LBB Series Oven Owner’s Manual
20 Version 13
Copyright © 2011 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 Despatch Industries, unless for purchaser's personal use.
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. While 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 3).
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 1 provides explanation for working
with the control instrument.
Warning!
Do not remove the hat bracket as it distributes exhaust air and
protects the exhaust opening from being completely covered.