Despatch LAC Series User manual

LAC/LFC Series Oven Owner’s Manual PREFACE
Version 1.12 1
Copyright © 2018 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 1
10/2008
LAC/LFC SERIES OVEN WITH
PROTOCOL 3™ CONTROLLER
OWNER’S MANUAL
C-266
PN 337069
VERSION 1.12
05/2018

PREFACE LAC/LFC Series Oven Owner’s Manual
2 Version 1.12
Copyright © 2018 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
1
03/2015
E. Anderson
Updated from base LAC manual C242. Updates
include addition of LFC1-38 Class A, minor UL
cleanup
1.1
04/2015
E. Anderson
Drawing restructure and solvent capabilities/safety
update
1.11
09/2015
E. Anderson
Miscellaneous clean up and edits
1.12
05/2018
K. Livingston
Additions to clarify LFC operation.

LAC/LFC Series Oven Owner’s Manual PREFACE
Version 1.12 3
Copyright © 2018 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.
The location of the Hi-Limit Sensor element is at the supply duct louver and has been
chosen to supervise that temperature. The Hi-Limit instrument should be set
approximately 10 to 20 degrees F., higher than the maximum operating temperature. This
setting will eliminate nuisance shutdowns when operating at the maximum temperature
of the unit and still give maximum protection to the oven or furnace
DESPATCH INDUSTRIES CANNOT BE RESPONSIBLE FOR EITHER
THE PROCESS OR THE QUALITY OF THE PRODUCT BEING
PROCESSED.
If the product on which the equipment is being used is critical of over temperature the Hi-
Limit should be used as a "Process Hi-Limit.” The sensor element is located on the
supply duct where the hot air enters work chamber. The temperature setting on the
“Process Hi-Limit”should be set somewhat below the temperature at which the product
would be damaged. If the product has an ignition temperature at which it could ignite, the
setting should be well below this temperature. It is recommended that a certified
instrument be used to make the proper setting.
IT IS THE PURCHASER'S RESPONSIBILITY THAT THE “EQUIPMENT
HI-LIMIT" AND/OR THE “PROCESS HI-LIMIT”BE SET PER THE
INSTRUCTIONS ON THIS SHEET AND ALSO THE INSTRUCTION
SHEET FOR THE PARTICULAR HI-LIMIT INSTRUMENT FURNISHED
WITH THIS UNIT.
Warning!
READ BEFORE OPERATING UNIT.
FAILURE TO HEED THIS WARNING CAN RESULT IN
PROPERTY DAMAGE, SERIOUS BODILY INJURY OR DEATH
Hi-Limit Controls
We recommend a Hi-Limit control for all ovens and furnaces.
A hi-limit control is included on this unit.
It is installed to protect the equipment.

PREFACE LAC/LFC Series Oven Owner’s Manual
4 Version 1.12
Copyright © 2018 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............................................................................................................. 7
1.1. Important User Information..................................................................................... 7
1.2. Manufacturer, Model Nomenclature & Service ...................................................... 8
1.2.1. Model Nomenclature........................................................................................... 8
1.2.2. 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. Solvent Capabilities........................................................................................... 11
1.5.3. Capacities .......................................................................................................... 12
1.5.3.1. Solvent Capacity............................................................................................ 13
1.5.4. Power................................................................................................................. 13
1.5.5. Temperature....................................................................................................... 14
1.5.6. LAC-8 Series Oven Environmental Operating Conditions............................... 14
2. Safety................................................................................................................................ 16
2.1. Safety Information................................................................................................. 16
2.1.1. Lockout.............................................................................................................. 16
2.1.1.1. Lockout Requirements................................................................................... 16
2.1.1.2. Lockout Procedure......................................................................................... 16
2.1.2. Door and Panel.................................................................................................. 17
2.2. Provisions for Lifting and Carrying....................................................................... 17
2.3. Maintenance .......................................................................................................... 18
2.4. Electrical Power..................................................................................................... 18
2.5. Fire......................................................................................................................... 18
2.6. Equipment Lockout Requirements........................................................................ 19
2.6.1. Emergency Stop................................................................................................. 19
2.7. Disconnecting Devices.......................................................................................... 19
2.7.1. Power Requirements.......................................................................................... 19
2.7.2. Disconnecting Hard-Wired Units...................................................................... 19
2.7.3. Disconnecting Corded Units.............................................................................. 20
2.7.4. Disconnecting Units with Optional Disconnect Switch .................................... 20
2.8. Airflow Switches: Recirculation and Forced Exhaust........................................... 20
3. Theory of Operation......................................................................................................... 22
3.1. The LAC-8 Series Oven........................................................................................ 22
3.2. LFC Specific Operation......................................................................................... 23
3.3. Damper Control..................................................................................................... 24
3.3.1. Determining Damper Settings ........................................................................... 24
3.3.1.1. Damper Full Closed Position......................................................................... 25
3.3.1.2. Damper Full Open Position........................................................................... 25
3.3.1.3. Exhaust Damper Control for LFC-8.............................................................. 25
3.3.1.4. Other Damper Settings.................................................................................. 26
3.4. The Protocol 3 Controller...................................................................................... 26
4. Assembly & Setup............................................................................................................ 28
4.1. Unpack & Inspect the LAC-8 Series Oven ........................................................... 28

LAC/LFC Series Oven Owner’s Manual PREFACE
Version 1.12 5
Copyright © 2018 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.
4.1.1. If Damaged During Shipping ............................................................................ 28
4.2. Set-Up the LAC-8 Series Oven............................................................................. 29
4.2.1. Select Oven Location/Operating Environment.................................................. 29
4.2.2. Set-up Procedure ............................................................................................... 29
4.2.3. Wiring & Power Connections ........................................................................... 30
4.2.3.1. Wire LAC-8 Models 2-12 and 2-18 .............................................................. 31
5. Operation.......................................................................................................................... 34
5.1. Load Oven............................................................................................................. 34
5.2. Pre-Startup Checklist............................................................................................. 35
5.3. Operating Procedure.............................................................................................. 36
5.3.1. Start Oven.......................................................................................................... 36
5.3.2. Working with Protocol 3 Operating Modes ...................................................... 36
6. Maintenance ..................................................................................................................... 37
6.1. Checklist................................................................................................................ 37
6.2. Test Airflow Switch and Purge Timer (LFC only; safety).................................... 38
6.3. Lubrication ............................................................................................................ 39
6.4. Cleaning and Decontamination ............................................................................. 39
6.4.1. Cleaning the LAC-8 Series Oven...................................................................... 39
6.4.2. Decontaminating the LAC-8 Series Oven......................................................... 40
6.5. Routine Tests......................................................................................................... 41
6.5.1. Recirculation and Exhaust Airflow Switch Test Operation .............................. 41
6.5.1.1. Alternative Method of Checking Power, Switches and Timer...................... 42
6.5.1.2. Recirculation And Exhaust Airflow Switch Adjustment............................... 43
6.5.1.3. Summary Switch Conditions......................................................................... 44
6.6. Door Adjustment................................................................................................... 45
6.7. Replacement Parts................................................................................................. 45
6.7.1. Replace the Protocol 3 Controller ..................................................................... 46
6.7.2. Replace Heater Unit .......................................................................................... 47
6.7.3. Replace Fan Motor............................................................................................ 48
7. Troubleshooting................................................................................................................ 49
7.1. Troubleshooting Symptoms................................................................................... 49
7.2. Troubleshooting Error Messages and Alarms ....................................................... 51
8. Appendices....................................................................................................................... 52
8.1. Standard Products Warranty.................................................................................. 52
8.2. LAC-8 Series Oven Options.................................................................................. 53
8.2.1. Optional MRC5000 Recorder Setup.................................................................. 53
8.2.2. Optional Pneumatic and Electronic Door Lock................................................. 54
8.2.3. Optional Interior Light ...................................................................................... 54
8.2.4. Optional Door Interlock Switch (Controls Heater & Fan) ................................ 54
8.2.5. Optional High Limit Alarm with Alarm Silence............................................... 54
8.2.6. Optional Forced Exhaust................................................................................... 55
8.2.7. Optional Clean Dry Air (CDA)/Nitrogen.......................................................... 55
8.3. Mechanical Drawings............................................................................................ 56
8.4. Electrical Schematics............................................................................................. 56
Figures
Figure 1. Disconnect Switch.......................................................................................................... 20
Figure 2. Locate the recirculation airflow switches in the control compartment.......................... 21

PREFACE LAC/LFC Series Oven Owner’s Manual
6 Version 1.12
Copyright © 2018 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.
Figure 3. Locate the forced exhaust airflow switch on the back of the oven. ............................... 21
Figure 4. LAC High-performance Bench-top Oven...................................................................... 22
Figure 5. Horizontal Airflow through the LAC Oven................................................................... 22
Figure 6. Damper Positions........................................................................................................... 25
Figure 7. LFC Oven Exhaust Damper Control.............................................................................. 25
Figure 8. Protocol 3 Controller Operator Interface. ...................................................................... 27
Figure 9. LAC2-18-8 Nameplate................................................................................................... 31
Figure 10. Rear Access Panel for Hard-Wired Connections......................................................... 32
Figure 11. Control panel removal.................................................................................................. 32
Figure 12. Power Connections at Main Circuit Board. ................................................................. 33
Figure 13. Circuit Board................................................................................................................ 39
Figure 14. Test Recirculation and Exhaust Airflow Switches....................................................... 42
Figure 15. Oven Control Circuit Board LEDs indicate status of switches.................................... 43
Figure 16: Shipping anchors Figure 17: Wall separator/anchor............................................... 45
Figure 18: Latch Adjustment Figure 19: Spring removal...................................................... 45
Figure 20. Remove Screws to Remove Ceiling Plate.................................................................... 47
Figure 21. Heater Panel and Inlet Cone......................................................................................... 47
Figure 22. Remove Heater Panel by Removing Screw in Front Edge of Each Panel................... 48
Tables
Table 1. Operating/Environmental Conditions (For indoor use)................................................... 15
Table 2. Troubleshooting Oven Symptoms................................................................................... 49
Table 3. Troubleshooting with Control Panel Mounted Circuit Board. ........................................ 50
Table 4. Error Messages and Next Steps....................................................................................... 51
Table 5. MRC 5000 Settings......................................................................................................... 53

LAC/LFC Series Oven Owner’s Manual ABOUT THIS MANUAL
Version 1.12 7
Copyright © 2018 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 © 2018 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.
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.

For here forward, unless noted otherwise the LFC
nomenclature may be substituted for LAC, as LAC is the
series or family of models upon which the LFC is built. Note
the LAC may NEVER be operated with solvents present.

Before operating this equipment, carefully read instruction
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.

ABOUT THIS MANUAL LAC/LFC Series Oven Owner’s Manual
8 Version 1.12
Copyright © 2018 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.
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, Model Nomenclature & Service
The LAC-8 Series oven is manufactured by Despatch Industries.
1.2.1. Model Nomenclature
The LAC series of laboratory ovens uses a suffix to indicate the current revision level. LAC-8,
the current oven revision, refers to the oven’s eighth revision.
The LAC series of laboratory ovens consist of four Class-B oven models:
oLAC 1-38-8
oLAC 1-67-8
oLAC 2-12-8
oLAC 2-18-8

The LAC Series of ovens are not configured for handling
flammable solvents.
The LFC series of laboratory ovens includes two class-A oven models configured for safe
handling of a limited amount of solvent when the oven is loaded at room temperature:
oLFC1-38-8
oLFC2-12-8
Danger!
Never load a hot oven. Wait for a hot oven to cool before
loading.
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.

LAC/LFC Series Oven Owner’s Manual ABOUT THIS MANUAL
Version 1.12 9
Copyright © 2018 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.
1.2.2. Service
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 LAC-
8 Series ovens, including installation instructions, theory of operation, operating instructions,
among other things.
Danger!
Failure to heed warnings in this instruction manual and on the
oven could result in personal injury, property damage or death.

ABOUT THIS MANUAL LAC/LFC Series Oven Owner’s Manual
10 Version 1.12
Copyright © 2018 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.
1.4. Conventions
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.

LAC/LFC Series Oven Owner’s Manual ABOUT THIS MANUAL
Version 1.12 11
Copyright © 2018 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
LAC
Model
No.
Chamber Size
in (cm)
Capacity
feet3
(liters)
Overall Size
in (cm)
Max.
Number of
Shelf
Positions
Exhaust Diameter
Located on Back
of Chamber
in (cm)
W0F
*
D
H
W
D
H
LAC
1-38
19
(48)
18
(45)
19
(48)
3.8
(105)
31
(79)
27
(69)
38
(96)
9
2.5
(6.4)
LFC
1-38
19
(48)
18
(45)
19
(48)
3.8
(105)
31
(79)
33
(84)
38
(96)
9
4.0
(10.2)
LAC
1-67
24
(61)
20
(51)
24
(61)
6.7
(187)
36
(91)
29
(74)
43
(110)
11
2.5
(6.4)
LAC
2-12
24
(61)
24
(61)
36
(91)
12
(336)
36
(91)
33
(84)
55
(139)
17
2x - 2.5
(2x - 6.4)
LFC
2-12
24
(61)
24
(61)
36
(91)
12
(336)
36
(91)
39
(99)
55
(139)
17
4.0
(10)
LAC
2-18
36
(90)
24
(61)
36
(91)
18
(500)
47
(120)
33
(84)
55
(139)
17
2x - 2.5
(2x - 6.4)
Notice
Refer to engineering drawings for exact dimensions.
1.5.2. Solvent Capabilities
*
Allow 0.5" (1cm) clearance on each side for shelf supports.

The LAC-8 oven is not intended to process solvents or other volatile or
flammable materials. Oven exhaust is intended for cooling purposes only.
The LFC is designed to handle solvents up to the stated ratings in this
manual and on the oven name plate.

ABOUT THIS MANUAL LAC/LFC Series Oven Owner’s Manual
12 Version 1.12
Copyright © 2018 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. Capacities
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.
LAC-8 Model Number
LAC1-38-8
120V & 240V
LFC
1-38-8
LAC
1-67-8
LAC
2-12-8
LFC
2-12-8
LAC
2-18-8
Maximum Load
Lbs (Kg)
175 (79)
175 (79)
250 (113)
300 (136)
300 (136)
300 (136)
Maximum Shelf
Load
Lbs (Kg)
50 (23)
50 (23)
50 (23)
50 (23)
50 (23)
50 (23)
Exhaust
CFM
Adjustable
to 12
Adjustable
From 13
to 41
Adjustable
to 12
Adjustable
to 30
Adjustable
From 13 to
41
Adjustable
to 40
Recirculating Fan
CFM
300
300
300
600
600
600
H.P.
¼
¼
¼
¼ x 2
¼ x 2
¼ x 2
Number of Doors
1
1
1
1
1
2
Approx. Weight Net
Lbs
185
185
255
360
360
450
KG
84
84
116
163
163
204
Shipping Weight
Lbs
270
270
360
480
480
600
KG
123
123
163
218
218
272

LAC/LFC Series Oven Owner’s Manual ABOUT THIS MANUAL
Version 1.12 13
Copyright © 2018 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.
1.5.3.1. Solvent Capacity
LAC-8 Model
Number
LAC1-38-8
120V & 240V
LFC
1-38-8
LAC
1-67-8
LAC
2-12-8
LFC
2-12-8
LAC
2-18-8
Solvent
Capacity
GPH
None
0.02
None
None
0.02
None
1.5.4. Power
If the line voltage for your LAC-8 Series oven varies more than 10% from the oven voltage
rating, electrical components such as relays and temperature controls may operate erratically.
Heater upgrade will change power requirements.
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
†
The LAC Series oven designed for 240 volts (see oven nameplate) will operate satisfactorily on a minimum of 208
Volts, but will result in 25% reduced heater output. If your power characteristic is lower, contact Despatch Industries.
An option is available to regain the full heater power when operating on 208V.
‡
The LAC 2-12 and LAC 2-18 must be hardwired to the electric supply using 10 AWG (8 AWG on
LAC2-18-8 208V full power option) or larger wires suitable for at least 75 °C (167 °F).
Model
Volts
Amps
Hertz
Phase
Heater
KW
Cord and Plug
LAC1-38-8
120
16.3
50/60
1
1.6
Included, 20 Amp (NEMA 5-20)
LAC1-38-81†
240
10.5
50/60
1
1.8
Included, 15 Amp (NEMA 6-15)
208
10.8
1.8
LFC1-38-8†
240
22.7
50/60
1
4.8
None, Hardwired.
Branch circuit rated device 30A.*
208
31.8
4.8
None, Hardwired.
Branch circuit rated device 40A.*
LAC1-67-8†
240
12.4
50/60
1
2.4
Included, 15 Amp (NEMA 6-15)
208
14.1
2.4
LAC2-12-8†‡
240
24.2
50/60
1
4.8
None, Hardwired.
Branch circuit rated device 35A.*
208
26.7
4.8
None, Hardwired.
Branch circuit rated device 35A.*

ABOUT THIS MANUAL LAC/LFC Series Oven Owner’s Manual
14 Version 1.12
Copyright © 2018 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.
*The overcurrent protection means provided by the building mains supply circuit shall be a
branch circuit rated protection device.
1.5.5. Temperature
LAC-8 Model Number
LFC
1-38
LFC
2-12
1-38
120V
1-38
240V
LAC
1-67
LAC
2-12
LAC
2-18
Time to Temperature 40 °C –100 °C
(approximate minutes 40 °C –200 °C
With dampers closed and no load)40 °C
–260 °C
2
9
12
9
35
60
6
25
45
6
26
40
7
18
35
5
20
45
Recovery Time - Door Open 100 °C
One Minute (approximate 200 °C
minutes with no load) 260 °C
N/A
N/A
1
6
14
1
4
8
1
3
5
1
6
9
1
4
8
Temperature Uniformity at 100 °C3F
§
200 °C§
260 °C§
± 2 %
of set-point
± 1 ° C
± 2 °C
± 2.5 °C
Operating Range with 20 °C Ambient
40 °C –260 °C
Control Stability
± 0.5 °C per 5 °C change in ambient
Repeatability
± 0.5° C
1.5.6. LAC-8 Series Oven Environmental Operating Conditions
The LAC-8 Series oven is for indoor use. Table 1 provides the operating conditions.
§
Figures are based on actual tests in an empty oven. Uniformity can vary slightly depending on unit and
operating conditions.
LFC2-12-8†
240
29.2
50/60
1
6
None, Hardwired.
Branch circuit rated device 40A.*
208
33.5
6
None, Hardwired.
Branch circuit rated device 50A.*
LAC2-18-8†‡
240
24.2
50/60
1
4.8
None, Hardwired.
Branch circuit rated device 30A.*
208
27.8
4.8
None, Hardwired.
Branch circuit rated device 35A.*

LAC/LFC Series Oven Owner’s Manual ABOUT THIS MANUAL
Version 1.12 15
Copyright © 2018 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 1. Operating/Environmental Conditions (For indoor use).
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)
**
Fluctuations in temperature can occur at elevated ambient temperature values.

SAFETY LAC/LFC Series Oven Owner’s Manual
16 Version 1.12
Copyright © 2018 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 LAC-8 Series oven without reading and understanding this section which
contains important information and warnings. The LAC is not designed to handle any amount of
solvents, while the LFC can handle up to the rated amount stated in this manual. 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 LAC-8 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 LAC-8 Series oven. An accidental start-up, while working on the
LAC-8 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 LAC-8 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.
Danger!
An accidental start-up, while working on the LAC-8 Series oven,
can result in serious injury or death.
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.

LAC/LFC Series Oven Owner’s Manual SAFETY
Version 1.12 17
Copyright © 2018 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. 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.
2.1.2. Door and Panel
A properly secured control panel on the LAC-8 Series oven protects against hazards. Operation
without the control panel in place creates hazards that the control panel is intended to render safe
for personnel.
2.2. Provisions for Lifting and Carrying
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:
LAC1-38: 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.
LAC1-67, LAC2-12 & LAC2-18: Do not lift by hand. Lift
with fork lifter and transport pallet.
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 LAC/LFC Series Oven Owner’s Manual
18 Version 1.12
Copyright © 2018 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.
2.3. 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 LAC-8 Series oven are strictly forbidden. Never
modify any electrical circuits. Unauthorized modifications can impair the function and safety
of the LAC-8 Series oven.
2.5. Fire
Keep the LAC-8 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 as it is.
2. De-energize the machine immediately by turning OFF the DISCONNECT SWITCH.
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.
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.

LAC/LFC Series Oven Owner’s Manual SAFETY
Version 1.12 19
Copyright © 2018 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. Turn off the remote main disconnect (customer supplied disconnect).
4. Shut off fuel.
5. Call the fire department.
6. Stay away.
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.
2.6. Equipment Lockout Requirements
To prevent injury or equipment damage during inspection or repair, the LAC-8 Series oven must
be locked out.
2.6.1. Emergency Stop
When a risk of personal injury or damage to the LAC-8 Series oven exists, turn OFF the oven by
removing/unplugging the cord. This shuts off all electrical power to the oven.
2.7. Disconnecting Devices
2.7.1. Power Requirements
Despatch recommends the LAC-8 have unobstructed access to a dedicated power source.

Use a power stabilizer if voltage fluctuation is greater than ±10%
nominal voltage fluctuation.
2.7.2. Disconnecting Hard-Wired Units
LAC-8 permanently-connected (hard-wired) ovens include models LAC2-12-8 and LAC2-18-8.
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.

SAFETY LAC/LFC Series Oven Owner’s Manual
20 Version 1.12
Copyright © 2018 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.

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.
2.7.3. Disconnecting Corded Units
LAC-8 cord-connected ovens include models LAC1-38-8 and LAC1-67-8. To disconnect a
corded unit, unplug the cord from the power source.
2.7.4. Disconnecting Units with Optional Disconnect Switch
The LAC-8 Series oven has an optional Disconnect Switch. This
Disconnect Switch is located on the front of the oven, typically near the
controls, 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 LAC-8 Series oven exists, turn off the
Disconnect Switch. This shuts off all electrical power to the oven.
2.8. Airflow Switches: Recirculation and Forced Exhaust
The airflow switch is used to prove airflow at the recirculation and exhaust fans when the
heater is being energized in the LFC Oven. The model LFC1-38-8 has two airflow
switches (one recirculation switch and one exhaust switch) while the model LFC2-12-8
has three airflow switches (two recirculation switches and one exhaust switch).
Locate the recirculation fan airflow switches in the control compartment (Figure 2).
Locate the forced exhaust fan on the back of the oven (Figure 3).
For test and operation of the airflow switches, refer to Section 6.5.1.
Figure 1. Disconnect
Switch.