Despatch LBB1-23A-1, LBB1-23A Installation Manual

C-188
P.N. 146230
REVISION L

11/2007

LBB SERIES OVENS

INSTRUCTION MANUAL

LBB Series Despatch Ovens are bench ovens to 204°C (400°F) with forced convection
airflow.

MODEL VOLTS HEATER WATTS AMPS HZ PHASE
LBB1-23A
LBB1-23B
LBB1-43A
LBB1-43B
LBB1-69A 120 2,400 21.6 50/60
LBB1-69B
LBB2-12 240 3,600 16.4 50/60
LBB2-18 240 3,600 16.4 50/60
LBB2-27 240 4,800 21.4 50/60

Prepared by:
Despatch Industries
8860 207th St. West
Lakeville, MN 55044
Customer Service 800-473-7373

120 1,200 11.6 50/60
240 1,200 5.8 50/60
120 1,600 15.0 50/60
240 1,600 7.5 50/60

240 2,400 10.8 50/60

1
1
1
1
1
1
1
1
1

NOTICE

CAUTION

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.

Setup and maintenance of the equipment should be performed by qualified personnel
who are experienced in handling all facets of this type of system. Improper setup and
operation of this equipment could cause an explosion that may result in equipment
damage, personal injury or possible death.

Dear Customer,
Thank you for choosing Despatch Industries. We appreciate the

opportunity to work with you and to meet your heat processing needs. We
believe that you have selected the finest equipment available in the heat
processing industry.

At Despatch, our service does not end after the purchase and delivery of
our equipment. For this reason we have created the Service Products
Division within Despatch. The Service Products Division features our
Response Center for customer service. The Response Center will direct
and track your service call to ensure satisfaction.

Whenever you need service or replacement parts, contact the Response
Center at 1-800-473-7373: FAX [phone].

Thank you for choosing Despatch.

Sincerely,
Despatch Industries

PREFACE

This manual is your guide to the Despatch oven. It is organized to give you the
information you need quickly and easily.

The INTRODUCTION section provides an overview of the Despatch oven.
The THEORY OF OPERATION section details the function and operation of assemblies

and subassemblies on the Despatch oven.
The INSTRUCTIONS and CONTROL

INSTRUCTIONS sections provide directions on
unpacking, installing, operating, maintaining and
troubleshooting the Despatch oven.

An efficient way to learn about the oven would be to read the manual while working with
the corresponding oven control system. This will give you practical hands-on
experience with information in the manual and the oven.

Before operating the equipment, be sure you
understand all of the technical information contained
in this manual. Information skipped, not understood
or misunderstood could create the possibility of
operating the equipment in an unsafe manner. This
can cause damage to the oven or personnel or reduce
the efficiency of the equipment.

Read the entire
INTRODUCTION and THEORY
OF OPERATION before
installing the oven.

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

i

Revision C: Updated electrical drawings in DRAWINGS AND SPARE PARTS LISTS

section.
Revision D: Corrections.
Revision E: Correction, page 19, set-up parameter table.
Revision F: Parts lists corrections in DRAWINGS AND SPARE PARTS LISTS section.
Revision G: Corrections to SPECIFICATIONS section, addition of options and features

in APPENDIX
Revision H: Change Product Warranty page.
Revision I: Update drawings and hi-limit information.
Revision J: Parts lists corrections in DRAWING AND SPARE PARTS LISTS section.

Corrected Despatch address.
Revision K: Parts lists corrections in DRAWING AND SPARE PARTS LISTS section.
Revision L: Updated warranty

ii

Table of Contents

PREFACE........................................................................................................................ i

INTRODUCTION.............................................................................................................1

Special Features..........................................................................................................1

Specifications ..............................................................................................................2

Dimensions ..............................................................................................................2

Power.......................................................................................................................3

Temperature ............................................................................................................4

Capacities ................................................................................................................4

THEORY OF OPERATION ............................................................................................. 5

CONTROL Instrument................................................................................................. 6

HI-LIMIT Instrument.....................................................................................................7

Product HI-LIMIT Instrument....................................................................................8

Oven HI-LIMIT Instrument........................................................................................8

Oven Theory ............................................................................................................9

INSTRUCTIONS ...........................................................................................................10

Unpacking and Inspection .........................................................................................10

Setup.........................................................................................................................11

Operating...................................................................................................................12

Loading the Oven...................................................................................................12

Pre-Startup Checklist.............................................................................................13

Startup ...................................................................................................................14

CONTROL INSTRUCTIONS.........................................................................................16

Changing Setpoint.....................................................................................................16

Parameter Programming Mode .................................................................................17

Operating Parameters............................................................................................17

Operating Parameters............................................................................................18

Set-Up Parameters ................................................................................................19

Changing Display From °C To °F ..................... .........................................................20

Oven Zone Calibration...............................................................................................21

Calibration Instructions...........................................................................................21

HI-LIMIT INSTRUCTIONS.........................................................................................22

Changing Setpoint.....................................................................................................22

Parameter Setup Mode..............................................................................................23

Setup Parameters......................................................................................................24

Changing Display From °C To °F ..............................................................................26

Maintenance ..........................................................................................................27

Checklist ................................................................................................................27

Tests......................................................................................................................28

Replacement Parts.................................................................................................28

Replacement of Control Instrument........................................................................29

Replacement of Hi-limit Instrument ........................................................................30

Replacement of Heater Unit...................................................................................31

Replacement of Fan Motor.....................................................................................32

Troubleshooting.........................................................................................................34

DRAWINGS AND SPARE PARTS LISTS.....................................................................36

LBB1-23A-1 Parts..................................................................................................37

LBB1-23A-1 Drawing .............................................................................................38

iii

LBB1-23B-1 Parts..................................................................................................39

LBB1-23B-1 Drawing .............................................................................................40

LBB1-43A-1 Parts..................................................................................................41

LBB1-43A-1 Drawing .............................................................................................42

LBB1-43B-1 Parts..................................................................................................43

LBB1-43B-1 DRAWING .........................................................................................44

LBB1-69A-1 Parts..................................................................................................45

LBB1-69A-1 Drawing .............................................................................................46

LBB1-69B-1 Parts..................................................................................................47

LBB1-69B-1 Drawing .............................................................................................48

LBB2-12-1 Parts.....................................................................................................49

LBB2-12-1 Drawing................................................................................................50

LBB2-18-1 Parts.....................................................................................................51

LBB2-18-1 Drawing................................................................................................52

LBB2-27-1 Parts.....................................................................................................53

LBB2-27-1 Drawing................................................................................................54

DESPATCH CUSTOMER SERVICE.............................................................................55

Procedures and Customer Responsibilities...............................................................55

Attachment A - Sustained Service Support............................................................56

APPENDIX: OPTIONAL FEATURES............................................................................57

Protocol Plus Control Option .....................................................................................57

Timer Option..............................................................................................................57

Timer Operation.....................................................................................................58

Timer Configuration................................................................................................58

Stand Assembly Instructions .....................................................................................59

Stacking Kit Assembly Instructions............................................................................60

Timer Option with Audible and Visual Alarm..............................................................61

High Limit Alarm Option.............................................................................................61

Recorder Option ........................................................................................................62

iv

INTRODUCTION

The INTRODUCTION section provides an overview of the Despatch LBB Series
Ovens. The LBB Series Ovens have the most effective heat distribution and the
fastest processing time of any lab oven its size. Air is discharged through ducts
on both sides of the oven distributed through the chamber, and returned through
the heater cover.

Special Features

The sturdy construction and high grade insulation of the Despatch LBB Series
ovens contribute to excellent high temperature performance. Other special
features include:

• Proportional digital CONTROL instrument to control temperature
fluctuations.

• Manual reset HI-LIMIT instrument to protect the chamber workload as well
as the oven itself.

• Unique Despatch design to combine forced circulated air through side ducts
for the ultimate in temperature performance.

• Welded double wall construction and fiberglass insulation to reduce heat
loss. Silicone rubber gaskets further minimize heat leakage.

• Rapid response heater with a five year warranty.

• Scratch-resistant baked enamel exterior and stainless steel interior for easy

cleaning.

• Space-saving, stackable design.

• Optional control panel located on the bottom of the oven.

1

Specifications

Dimensions

Model

LBB1-23

LBB1-43

LBB1-69

LBB2-12

LBB2-18

LBB2-27

Chamber Size

in (cm)
W D H
18

18

(46)

(46)

(30)

24

14

(61)

(36)

(56)

30

18

(76)

(46)

(56)

30

20

(76)

(51)

(89)

37

24

(94)

(61)

(89)

37

37

(94)

(94)

(89)

12

22

22

35

35

35

Capacity

feet3

(liters)

2.3

(65)

4.3

(122)

6.9

(195)

12.1

(343)

18

(510)

27.7

(785)

Overall Size

in (cm)

W

24

(61)

30

(76)

34

(86)

36

(91)

43

(102)

43

(102)

D

23

(58)

19

(48)

23

(58)

25

(64)

29

(74)

42

(107)

H

26

(66)

36

(91)

36

(91)

51

(130)

51

(130)

51

(130)

Shelves

Provided on

Shelf Centers

2 on 2"

2 on 2"

2 on 2"

2 on 2"

2 on 2"

2 on 2"

Maximum

Number of Shelf

Positions

5

10

10

16

16

16

Chamber

Doors

1

1

2

2

2

2

2

Power

Line voltages may vary in some geographical locations. If your line voltage is
much lower than the oven voltage rating, warm up time will be longer and motors
may overload or run hot. If your line voltage is higher than nameplate rating, the
motor may run hot and draw excessive amps.

If the line voltage varies more than 10% from the oven voltage rating, some
electrical components such as relays, temperature controls, etc. may operate
erratically.

Model Volts

LBB1-23A
LBB1-23B

LBB1-43A
LBB1-43B

LBB1-69A
LBB1-69B

LBB2-12

LBB2-18

LBB2-27

120

240*

120

240*

120

240*

240

240

240

Amps

11.6

5.8

15.0

7.5

21.6

10.8

16.4

16.4

21.4

Hertz
50/60

50/60

50/60
50/60

50/60
50/60

50/60

50/60

50/60

Phase

1
1

1
1

1
1

1

1

1

Heater (KW)

1.2

1.2

1.6

1.6

2.4

2.4

3.6

3.6

4.8

Cord and Plug

Included, 15 Amp
Included, 15 Amp

Included, 20 Amp
Included, 15 Amp

None, Hardwired
None, Hardwired

None, Hardwired

None, Hardwired

None, Hardwired

• The LBB1-69, LBB2-12, LBB2-18 and LBB2-27 must be hardwired to the electric supply
using 10AWG or larger wires suitable for at least 75°C (167°F).

• Ovens designed for 240 volts (see name plate on oven) 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.

3

Temperature

LBB

Model

Time to Temperature 40°C - 150°C
(approximate minutes
with no load) 40°C - 204°C

Recovery Time 150°C
Door Open 1 Min. (approx.
minutes with no load) 204°C

Temperature Uniformity 150°C
At:
204°C

Operating Range
w/20°C Ambient
Control Stability +/- 0.5°C

1-23

3°C

4°C

17

30

2

4

+/-

+/-

1-43

17

30

2

4

+/­3°C

+/-

4°C

35°C - 204°C 40°C - 204°C

1-69

15

26

3

6

+/- 3°C

+/- 4°C

2-12

15

30

3

6

+/- 2°C

+/- 3°C

2-18

17

33

3

7

+/- 3°C

+/- 4°C

2-27

+/- 3°C

+/- 4°C

17

33

4

8

* Dampers must be open to operate at the minimum temperature.

NOTE: 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.

Capacities

LBB

Model

Maximum load capacity (lbs)
Maximum shelf load (lbs) 50 50 200 * 200 * 200 * 200 *
Exhaust Capacity, CFM 1 2 3 12 14 14

1-23

200 200 400 600 600 600

1-43 1-69

2-12

2-18

NOTE: Maximum load capacity not valid with “control panel located on bottom”
option.

• LBB1-69 and larger models have reinforced shelves. Standard duty (50
pounds max) shelves are also available.

WARNING: Do not exceed a total of 400 pounds for stacked LBB1-69.

2-27

4

THEORY OF OPERATION

The THEORY OF OPERATION section details the function and operation of
assemblies and subassemblies on the Despatch LBB Series Ovens.

The Despatch LBB Series Ovens have the most effective heat distribution system
and the fastest processing time of any lab oven its class. These ovens are
especially useful for testing, preheating, sterilizing, drying, aging and curing as well
as other production applications.

The Despatch 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. The air is
circulated with a high volume fan. The Despatch 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.

Forced Circulating Airflow in Despatch LBB Ovens

5

CONTROL Instrument

or

The oven is equipped with a microprocessor based digital control instrument. The
Despatch CONTROL instrument has been configured as a proportional controller
and set to its optimum operating values. Initially the CONTROL will allow the
heater to operate at full power. However, as the actual oven temperature reaches
the setpoint, the Proportional Control will cycle the heater on and off, minimizing
process temperature fluctuations.

CONTROL Instrument

Features Description
Main (PV) Display Displays the actual oven temperature or displays the setpoint when the set

key is pressed. Displays parameter code and value.

Key

Down Key Decreases a setpoint or mode parameter.
Up Key Increases a setpoint or mode parameter.
LED SP Indicator Lights when the setpoint value is displayed.
LED OUT Indicator Lights when the control is calling for heat.
LED AL1 –2 Indicator N/A

Switches between PV and SP displays. Enters the data changed by the

keys. Switches through parameter displays.

6

HI-LIMIT Instrument

The oven is equipped with a HI-LIMIT instrument. The purpose of the HI-LIMIT
instrument is to provide a protective measure for the product and/or the oven itself.
If the setting on the HI-LIMIT is exceeded, the heating process will discontinue,
thus protecting the product and/or the oven.

Set the HI-LIMIT instrument to a temperature 10°C - 14°C higher than the
CONTROL instrument setpoint or a temperature that should not be exceeded in
the process. If the setting on the HI-LIMIT instrument is exceeded the heater will
shut down. The HI-LIMIT instrument must be manually reset by pushing the
RESET button on the HI-LIMIT instrument.

HI-LIMIT Instrument

Features Description
OP1 Output 1 status value. (OP2 normally not used for LBB Ovens).
°C/°F
PV Process value.
HSP1 High limit setpoint 1. (LSP1 normally not used for LBB Ovens).
SP2 Setpoint 2 for output 2 (normally not used for LBB Ovens).
LOCK Lock status indicator.

Up Key Increases a setpoint or mode parameter.
Down Key Decreases a setpoint or mode parameter.

Degree indicator.

Scroll Key, used for advancing available displays.

Reset the high limit, return to normal display.

7

Product HI-LIMIT Instrument

If the product being processed has a critical high temperature limit, the HI-LIMIT
instrument should be used as a product HI-LIMIT instrument. The HI-LIMIT
instrument should be set to a temperature somewhat below the temperature at
which the product could be damaged.

Oven HI-LIMIT Instrument

If the product does not have a critical high temperature limit, the HI-LIMIT can be
used as an oven HI-LIMIT instrument. An oven HI-LIMIT instrument protects oven
equipment. The HI-LIMIT should be set at 204°C

8

Oven Theory

The oven has an efficient forced circulating oven to 204°C (400°F). A forced
circulating oven relies on a circulating motor to move air through the chamber ,
which is much more efficient and uniform than a gravity convected oven. In
addition, it takes a finite amount of time for the oven to soak in at the desired
setpoint. The time that it takes the unit to soak in at setpoint is related to such
parameters as chamber area, load mass and the ability to absorb heat and
exhaust rate. The unique Despatch design and CONTROL action compensates
for these facts.

The oven uses an indicating microprocessor based digital control that displays the
actual chamber temperature at the sensing point. Despatch strategically locates
the CONTROL's temperature sensor to optimize the control action for the entire
chamber for various load conditions. The CONTROL display may fluctuate a few
degrees around the setpoint, but the overall chamber temperature will remain very
stable. The underlying reason for this is that the display is showing temperature
fluctuations at the temperature sensor location, not the overall chamber
temperature. 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 engineered to have an overall result of quality productivity
where fast processing and versatility are critical.

9

INSTRUCTIONS

The INSTRUCTIONS section provides directions on unpacking, installation,
operation and maintenance of the Despatch LBB Series Ovens.

Unpacking and Inspection

Remove all packing materials and thoroughly inspect the oven for damage of any
kind that could have occurred during shipment.

• See whether the carton and plastic cover sheet inside carton are still in
good condition.

• Look at all outside surfaces and corners of the oven for scratches and
dents.

• Check the oven controls and indicators for normal movement, bent shafts,
cracks, chips or missing parts such as knobs and lenses.

• Check the door and latch for smooth operation.

If there is damage, and it could have happened during shipment follow these
instructions.

1. Contact the shipper immediately and file a written damage claim, before
contacting Despatch Industries.

2. Contact Despatch Industries to report your findings and to order
replacement parts for those that were damaged or missing.

3. Please send a copy of your filed damage claims to Despatch.

Next, check to make sure you have received all the required materials. Your
shipment should include:

• One (1) Despatch oven,

• One (1) Instruction manual,

• One (1) Warranty card,

• Two (2) Shelves

• One (1) Damper assembly

If any of these items are missing from the packaged contents, contact Despatch
Industries to have the appropriate materials forwarded to you.

10

Setup

1. Place oven on a bench top or an optional stand.
The oven must have a minimum of two (2) inches clearance in the rear to

provide proper ventilation. The oven may be placed next to another
cabinet, or next to another oven, with three (3) inch clearance (the doors will
still open).

Make sure oven is level and plumb; this will
assure proper heat distribution and operation of
all mechanical components.

2. Identify correct power source indicated on the
specification plate.

3. Hardwire oven directly to the electric supply.

WARNING: All grounding
and safety equipment must
be in compliance with
applicable codes, ordinances
and accepted safe practices.

11

Operating

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

WARNING: Do not use oven in
wet, corrosive or explosive
atmospheres unless this oven is
specifically designed for a special
atmosphere.

Loading the Oven

Despatch Industries cannot be responsible for either the
process or process temperature used, or for the quality of
the product being processed. It is the responsibility of the
purchaser and operator to see that the product
undergoing processing in a Despatch oven is adequately
protected from damage.

Carefully following the instructions in this manual will help
the purchaser and operator in fulfilling that responsibility.

The two shelves are designed to be pulled out about half way without tipping. The
support capacity of the shelves is listed in the Capacities Table in the
Specifications section in this manual. Do not overload the shelves.

Distribute the workload evenly so that airflow is not restricted. Do not overfill your
oven. The workload should not take up more than two-thirds of any dimension of
the inside cavity.

WARNING: Never
operate oven at a
temperature in excess
of the maximum
operating temperature
of 204°C (400°F).

12

Pre-Startup Checklist

 Know the system. Read this manual carefully. Make use of its instructions

and explanations. The know how of safe, continuous, satisfactory, trouble­free operation depends primarily on the degree of your understanding of the
system and of your willingness to keep all parts in proper operating
condition.

 Check line voltage. Voltage must correspond to nameplate requirements of

motors and controls. Refer to the section on power connections in the
INTRODUCTION of this manual.

 Fresh air, exhaust, and electrical cabinet openings.

Do not be careless about restrictions in and around
the fresh air and exhaust openings. Under no
condition permit them to become so filled with dirt
that they appreciably reduce the air quantity. Refer
to the Set-up instructions in this manual.

 Ventilation. There is an exhaust opening in the

rear of the unit.

The exhaust vent may have to be closed to reach the maximum temperature of
204°C, especially if operating on 208 volts. They may need to be opened to
operate properly at the lower range of the oven's design

 Helpful hints

• For drying ovens, open vent to prevent buildup of moisture.

• For sample heating, close the vent when no ventilation is required.

NOTE:
The exhaust vent may
have to be adjusted to
achieve maximum
performance at various
operating temperatures.

13