Despatch LAC2-12-7 User Manual

LAC Series Oven Owner’s Manual PREFACE

ULTRAFLEX DRYING AND FIRING FURNACE

MODELS 1000, 3615, 3630, 3640

C-204 VERSION 1

10/2008

LAC-7 SERIES OVEN WITH

PROTOCOL 3™ CONTROLLER OWNER’S MANUAL

C-242 PN 320126 VERSION 1 6/2012

Version 1 1

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

PREFACE LAC Series Oven Owner’s Manual

Revision

Date

Author

Description

1

6/2012

Livingston

Update to LAC-7 version from LAC-6 (Version

10). Update to Protocol 3.

2 Version 1

Revision History

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

LAC Series Oven Owner’s Manual PREFACE Version 1 3

Table of Contents

1. About This Manual ............................................................................................................. 6

1.1. Important User Information ..................................................................................... 6

1.2. Manufacturer & Service .......................................................................................... 7

1.3. Organization of this Manual .................................................................................... 7

1.4. Conventions ............................................................................................................. 8

1.5. Specifications .......................................................................................................... 9

1.5.1. Dimensions .......................................................................................................... 9

1.5.2. Capacities .......................................................................................................... 10

1.5.3. Power ................................................................................................................. 11

1.5.4. Temperature ....................................................................................................... 12

1.5.5. LAC-7 Series Oven Operating Conditions ........................................................ 12

2. Safety ................................................................................................................................ 13

2.1. Safety Information ................................................................................................. 13

2.1.1. Lockout .............................................................................................................. 13

2.1.1.1. Lockout Requirements ................................................................................... 13

2.1.1.2. Lockout Procedure ......................................................................................... 13

2.1.2. Door and Panel .................................................................................................. 14

2.2. Provisions for Lifting and Carrying....................................................................... 14

2.3. Maintenance .......................................................................................................... 15

2.4. Electrical Power ..................................................................................................... 15

2.5. Fire ......................................................................................................................... 16

2.6. Equipment Lockout Requirements ........................................................................ 16

2.6.1. Emergency Stop ................................................................................................. 16

2.7. Disconnecting Devices .......................................................................................... 16

2.7.1. Power Requirements .......................................................................................... 16

2.7.2. Disconnecting Hard-Wired Units ...................................................................... 16

2.7.3. Disconnecting Corded Units .............................................................................. 17

2.7.4. Disconnecting Units with Optional Disconnect Switch .................................... 17

3. Theory of Operation ......................................................................................................... 18

3.1. The LAC-7 Series Oven ........................................................................................ 18

3.2. Damper Control ..................................................................................................... 19

3.2.1. Determining Damper Settings ........................................................................... 19

3.2.1.1. Damper Full Closed Position ......................................................................... 19

3.2.1.2. Damper Full Open Position ........................................................................... 19

3.2.1.3. Other Damper Settings .................................................................................. 20

3.3. The Protocol 3 Controller ...................................................................................... 20

4. Assembly & Setup ............................................................................................................ 22

4.1. Unpack & Inspect the LAC-7 Series Oven ........................................................... 22

4.1.1. If Damaged During Shipping ............................................................................ 23

4.2. Set-Up the LAC-7 Series Oven ............................................................................. 23

4.2.1. Select Oven Location/Operating Environment .................................................. 23

4.2.2. Set-up Procedure ............................................................................................... 23

4.2.3. Wiring & Power Connections ........................................................................... 24

4.2.3.1. Wire LAC-7 Models 2-12 and 2-18 .............................................................. 25

5. Operation .......................................................................................................................... 28

5.1. Load Oven ............................................................................................................. 28

5.2. Pre-Startup Checklist ............................................................................................. 29

5.3. Operating Procedure .............................................................................................. 29

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.

PREFACE LAC Series Oven Owner’s Manual 4 Version 1

5.3.1. Start Oven .......................................................................................................... 30

5.3.2. Working with Protocol 3 Operating Modes ...................................................... 30

6. Maintenance ..................................................................................................................... 31

6.1. Checklist ................................................................................................................ 31

6.2. Lubrication ............................................................................................................ 32

6.3. Cleaning and Decontamination ............................................................................. 32

6.3.1. Cleaning the LAC-7 Series Oven ...................................................................... 32

6.3.2. Decontaminating the LAC-7 Series Oven ......................................................... 33

6.4. Routine Tests ......................................................................................................... 33

6.5. Door Adjustment ................................................................................................... 34

6.6. Replacement Parts ................................................................................................. 34

6.6.1. Replace the Protocol 3 Controller ..................................................................... 34

6.6.2. Replace Heater Unit .......................................................................................... 35

6.6.3. Replace Fan Motor ............................................................................................ 36

7. Troubleshooting................................................................................................................ 38

7.1. Troubleshooting Symptoms ................................................................................... 38

7.2. Troubleshooting Error Messages and Alarms ....................................................... 40

8. Appendices ....................................................................................................................... 41

8.1. Standard Products Warranty .................................................................................. 41

8.2. LAC-7 Series Oven Options .................................................................................. 42

8.2.1. Optional MRC5000 Recorder Setup.................................................................. 42

8.2.2. Optional Pneumatic and Electronic Door Lock ................................................. 43

8.2.3. Optional Interior Light ...................................................................................... 43

8.2.4. Optional Door Interlock Switch (Controls Heater & Fan) ................................ 43

8.2.5. Optional High Limit Alarm with Alarm Silence ............................................... 43

8.2.6. Optional Forced Exhaust ................................................................................... 44

8.2.7. Optional Clean Dry Air (CDA)/Nitrogen .......................................................... 44

8.3. Electrical Schematics ............................................................................................. 44

Figures

Figure 1. Disconnect Switch.......................................................................................................... 17

Figure 2. LAC High-performance Bench-top Oven. ..................................................................... 18

Figure 3. Horizontal Airflow through the LAC Oven. .................................................................. 18

Figure 4. Damper Positions. .......................................................................................................... 19

Figure 5. Protocol 3 Controller Operator Interface. ...................................................................... 21

Figure 6. LAC2-18-7 Nameplate. .................................................................................................. 25

Figure 7. Rear Access Panel for Hard-Wired Connections. .......................................................... 26

Figure 8. Hinged Panel for Simpler Access to Power Connections. ............................................. 26

Figure 9. Power Connections at Main Circuit Board. ................................................................... 27

Figure 10. Remove Screws to Remove Floor Plate. ...................................................................... 35

Figure 11. Heater Panel and Inlet Cone. ........................................................................................ 35

Figure 12. Remove Screws to Remove Side Panels. ..................................................................... 35

Figure 13. Remove Heater Panel by Removing Screw in Front Edge of Each Panel. .................. 36

Figure 14. LAC-7 Circuit Board. .................................................................................................. 39

Figure 15. LAC1-10-7, 120V (Drawing 313904A01). .................................................................. 45

Figure 16. LAC1-38A-7, 120V (Drawing 313906A01). ............................................................... 45

Figure 17. LAC1-38B-7, 208V (Drawing 320160A01). ............................................................... 45

Figure 18. LAC1-38B-7, 240V (Drawing 320125A01). ............................................................... 45

Figure 19. LAC1-67-7, 208V (Drawing 320162A01). .................................................................. 45

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

LAC Series Oven Owner’s Manual PREFACE Version 1 5

Figure 20. LAC1-67-7, 240V (Drawing 313907A01). .................................................................. 45

Figure 21. LAC2-12-7, 208V (Drawing 320164A01). .................................................................. 45

Figure 22. LAC2-12-7, 240V (Drawing 313908A01). .................................................................. 45

Figure 23. LAC2-18-7, 208V (Drawing 320166A01). ................................................................. 45

Figure 24. LAC2-18-7, 240V (Drawing 313905A01). .................................................................. 45

Tables

Table 1. Operating/Environmental Conditions (For indoor use). .................................................. 12

Table 2. Troubleshooting Oven Symptoms. .................................................................................. 38

Table 3. Troubleshooting with Control Panel Mounted Circuit Board. ........................................ 39

Table 4. Error Messages and Next Steps. ...................................................................................... 40

Table 5. MRC 5000 Settings. ........................................................................................................ 42

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

ABOUT THIS MANUAL LAC Series Oven Owner’s Manual



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.

6 Version 1

1. About This Manual

1.1. Important User Information

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

Printed and bound in the United States of America.

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

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

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

LAC Series Oven Owner’s Manual ABOUT THIS MANUAL

Global Headquarters

Contact

Service & Technical Support

Despatch Industries

8860 207th Street Lakeville, MN 55044 USA

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

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

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.

Version 1 7

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 LAC-7 Series oven is manufactured by Despatch Industries.

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

1.3. Organization of this Manual

This owner’s manual contains the most comprehensive set of information for the Despatch LAC7 Series ovens, including installation instructions, theory of operation, operating instructions, among other things.

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

ABOUT THIS MANUAL LAC Series Oven Owner’s Manual

Danger!

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

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

Danger!

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

Warning!

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

Caution!

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

Notice

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



This icon signifies supplemental important information.

8 Version 1

1.4. Conventions

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

LAC Series Oven Owner’s Manual ABOUT THIS MANUAL

LAC

Model

No.

Chamber Size

in (cm)

Capacity

feet

3

(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

1-10

13.75 (35)

12

(31)

12

(31) 1 (33)

23

(58)

19

(48)

29.5 (75)

5

1

(2.5)

1-38 A

18.75 (48)

18

(46)

19

(48)

3.7

(105)

28

(71)

25

(64)

35.5 (90)

9

2.5

(6.4)

1-38 B

18.75 (48)

18

(46)

19

(48)

3.7

(105)

28

(71)

25

(64)

35.5 (90)

9

2.5

(6.4)

1-67

23.75 (60)

20

(51)

24

(61)

6.6

(187)

36

(91)

27

(69)

40.5

(103)

11

2.5

(6.4)

2-12

23.75 (60)

24

(61)

36

(91)

12

(336)

36

(91)

31

(79)

52.5

(133)

17

2 - 2.5 (5-6.4)

2-18

35.25 (91)

24

(61)

36

(91)

18

(500)

47

(119)

29.5 (75)

52.5

(133)

17

2 - 2.5 (5-6.4)

*



The LAC-7 oven is not intended to process solvents or other volatile or flammable materials. Oven exhaust is intended for cooling purposes only.

Warning!

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

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

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

Version 1 9

1.5. Specifications

1.5.1. Dimensions

Allow 0.375" (0.95 cm) clearance on each side for shelf supports (3/4 in (1.9 cm) total).

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

ABOUT THIS MANUAL LAC Series Oven Owner’s Manual

Contact Despatch for options available to help prevent such failures.

LAC-7 Model Number

1-10-7

1-38 A-7 & 1-

38 B-7

1-67-7

2-12-7

2-18-7

Maximum Load

Lbs (Kg)

150 (68)

175 (79)

250 (113)

300 (136)

Maximum Shelf Load

Lbs (Kg)

50 (23)

Exhaust

CFM

Adjustable

to 5

Adjustable

to 12

Adjustable

to 12

Adjustable

to 30

Adjustable

to 40

Recirculating Fan

CFM

150

300

600

H.P.

1/25 ¼ ¼

¼ x 2

Number of Doors

1 1 1 1 2

Approx. Weight Net

Lbs

110

185

255

360

450

KG

50

84

116

163

204

Shipping Weight

Lbs

175

270

360

480

600

KG

79

123

163

218

272

10 Version 1

1.5.2. Capacities

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LAC Series Oven Owner’s Manual ABOUT THIS MANUAL

†

‡

Model

Volts

Amps

Hertz

Phase

Heater

KW

Cord and Plug

LAC1-10-7

120

10.0

50/60 1 1

Included, 15 Amp (NEMA 5-15)

LAC1-38A-7

120

16.5

50/60

1

1.6

Included, 20 Amp (NEMA 5-20)

LAC1-38B-71F†

240

9.4

50/60 1

1.8

Included, 15 Amp (NEMA 6-15)

208

10.6

1.8

LAC1-67-7† 240

11.6

50/60

1

2.4

Included, 15 Amp (NEMA 6-15)

208

13.2

2.4

LAC2-12-7†‡

240

18.3

50/60 1

3.6

None, Hardwired. Branch circuit rated device 25A.*

208

20.6

3.6

None, Hardwired. Branch circuit rated device 30A.*

LAC2-18-7†‡

240

23.4

50/60

1

4.8

None, Hardwired. Branch circuit rated device 30A.*

208

26.5

4.8

None, Hardwired. Branch circuit rated device 35A.*

Version 1 11

1.5.3. Power

If the line voltage for your LAC-7 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

*The overcurrent protection means provided by the building mains supply circuit shall be a branch circuit rated protection device.

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 LAC2-18-7 208V full power option) or larger wires suitable for at least 75 °C (167 °F).

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

ABOUT THIS MANUAL LAC Series Oven Owner’s Manual

LAC-7 Model Number

1-10

1-38 A

1-38 B

1-67

2-12

2-18

Time to Temperature 40 °C – 100 °C (approximate minutes 40 °C – 200 °C with no load) 40 °C – 260 °C

8 25 40

9 32 60

6 22 36

6 20 34

6 19 31

4 17 29

Recovery Time - Door Open 100 °C One Minute (approximate 200 °C minutes with no load) 260 °C

1 3 7

1

6 14

1

4

8

1

3

5

1

6

9

1

4

8

Temperature Uniformity at 100 °C3F§ 200 °C§ 260 °C§

± 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

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)

§

**

12 Version 1

1.5.4. Temperature

1.5.5. LAC-7 Series Oven Operating Conditions

The LAC-7 Series oven is for indoor use. Table 1 provides the operating conditions.

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

Figures are based on actual tests in an empty oven. Uniformity can vary slightly depending on unit and

operating conditions.

Fluctuations in temperature can occur at elevated ambient temperature values.

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

LAC Series Oven Owner’s Manual SAFETY



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

Danger!

An accidental start-up, while working on the LAC-7 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.

Version 11 13

2. Safety

2.1. Safety Information

Do not work on the LAC-7 Series oven without reading and understanding this section which contains important information and warnings. Ignoring these warnings can result in death, serious injury or damage to the machine and product.

2.1.1. Lockout

Machine lockout places the LAC-7 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-7 Series oven. An accidental start-up, while working on the LAC-7 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-7 Series oven must be shut off

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

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

2.1.1.2. Lockout Procedure

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

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

or disconnects.

2. Close all valves and bleed off any pressure.

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

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

SAFETY LAC Series Oven Owner’s Manual

Caution!

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

Caution!

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

Notice

How to lift the different sizes of ovens:

 LAC1-10: Two

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.

 LAC1-38: 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.

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.

14 Version 1

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

The control panel on the LAC-7 Series oven protect 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

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

LAC Series Oven Owner’s Manual SAFETY

 LAC1-67, LAC2-12

& LAC2-18: Do not lift by hand. Lift with fork lifter and transport pallet.

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.

Version 11 15

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-7 Series oven are strictly forbidden. Never

modify any electrical circuits. Unauthorized modifications can impair the function and safety of the LAC-7 Series oven.

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

SAFETY LAC Series Oven Owner’s Manual

Danger!

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



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

16 Version 1

2.5. Fire

Keep the LAC-7 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.

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

4. Shut off fuel.

5. Call the fire department.

6. Stay away.

2.6. Equipment Lockout Requirements

To prevent injury or equipment damage during inspection or repair, the LAC-7 Series oven must be locked out.

2.6.1. Emergency Stop

When a risk of personal injury or damage to the LAC-7 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-7 have unobstructed access to a dedicated power source.

2.7.2. Disconnecting Hard-Wired Units

LAC-7 permanently-connected (hard-wired) ovens include models LAC2-12-7 and LAC2-18-7. 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.

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

LAC Series Oven Owner’s Manual SAFETY



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.

Figure 1. Disconnect Switch.

Version 11 17

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

2.7.3. Disconnecting Corded Units

LAC-7 cord-connected ovens include models LAC1-10-7, LAC1-38A-7, LAC1-38B-7 and LAC1-67-7. To disconnect a corded unit, unplug the cord from the power source.

2.7.4. Disconnecting Units with Optional Disconnect Switch

The LAC-7 Series oven has an optional Disconnect Switch (Figure 1). This Disconnect Switch is located on the front of the oven and connected to the load break switch behind the panel that disconnects or connects power from the main line. When a risk of personal injury or damage to the LAC-7 Series oven exists, turn off the Disconnect Switch. This shuts off all electrical power to the oven.

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

THEORY OF OPERATION LAC Series Oven Owner’s Manual

Warning!

Do not remove the hat bracket (located in rear of oven) as it distributes exhaust air and protects the exhaust opening from being completely covered.

Fresh Air

Damper

Control

Power Switch

Controller

Figure 2. LAC High-performance Bench-top Oven.

Figure 3. Horizontal Airflow through the LAC Oven.

Exhaust Port

18 Version 1

3. Theory of Operation

3.1. The LAC-7 Series Oven

The LAC-7 high-performance bench-top oven uses digitally-controlled, horizontal recirculating airflow to ensure uniform temperatures throughout the oven for fast-processing (Figure

2). A high-volume fan circulates air through perforated, stainless steel walls to create a constant horizontal airflow across all sections of the oven (Figure 3). The result is proven reliability in demanding production and laboratory applications such as curing, drying, sterilizing, aging and other process-critical procedures.

The LAC-7 oven is especially useful for testing, preheating, sterilizing, drying, aging and curing along with other production applications. The overall result is efficient productivity under strenuous conditions. The chamber can be densely loaded without interfering with the process. Air delivery temperature is within 1°C of the number appearing on the digital display. Fresh air intake is regulated by a panel-mounted damper control, while the exhaust opening is fixed. The exhaust port, on the back of the oven, is covered by a hat bracket.

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LAC Series Oven Owner’s Manual THEORY OF OPERATION



When the damper is in the full open position, the oven may not be able to heat to the maximum oven operating temperature.

Figure 4. Damper Positions.

Version 1 19

3.2. Damper Control

The LAC-7 oven is equipped with a manually-adjustable damper mechanism. The damper control arm is located on the front panel of the oven (Figure 1). The damper adjustment controls the fresh air opening which, due to pressurization of the oven chamber, controls the flow of exhaust. If the damper is in the full open position, the maximum exhaust rate is achieved. If the damper is in the fully closed position, the minimum exhaust rate is achieved.

3.2.1. Determining Damper Settings

The optimum setting for the damper depends on a variety of factors. These factors include ambient environment temperature, load conditions, load distribution, heat-up and cool-down rates, desired temperature uniformity and most importantly the desired operating temperature. Additionally, engineering tradeoffs for each factor must be carefully weighed. While considering each factor independently may be too daunting, guidelines provide a simpler way to determine damper settings.

In general, set the damper so the amount of fresh air flowing into and exhausting from the chamber agrees with the desired operating temperature conditions. The following outline provides practical considerations for various damper position settings (Figure 3).

3.2.1.1. Damper Full Closed Position

The damper in full closed position allows maximum attainable heat-up rates for the chamber. In addition, the chamber uses minimum power to operate at the desired temperature. In most cases, maintain the damper in the full closed position to efficiently operate at the maximum operating temperature for the chamber.

3.2.1.2. Damper Full Open Position

The damper in full open position allows minimum operating temperature for the chamber. Friction heat from the air recirculation system builds up in the chamber. This causes chamber temperature to rise slightly though the heating system is not ON. After the recirculation motor has been ON for an extended period of time, the chamber reaches a thermal equilibrium temperature.

When the damper is not set to full open position, the chamber has no way to readily dissipate the heat generated by the friction. With the damper fully open, the thermal equilibrium temperature is the minimum operating temperature of the chamber.

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THEORY OF OPERATION LAC Series Oven Owner’s Manual



Over-pressuring the chamber can cause hot air to blow out around the door seal and cause the area around the door to be hot to the touch. Eliminate this hot air from entering the room by closing the damper slightly until the air stops blowing.

20 Version 1

3.2.1.3. Other Damper Settings

The damper can be set to several other distinct operating positions. In most cases the damper setting is influenced by two specific performance factors: uniformity and cool-down rates.

Chamber Uniformity

The system’s inside chamber pressure influences chamber uniformity. Pressure inside the chamber depends on the amount of fresh air flowing into the chamber. When a large volume of fresh air flows into the chamber, the chamber pressurizes slightly and overall temperature uniformity improves. The slightly pressurized chamber produces the effect of "pushing" air to the corners of the chamber. Typically the corners of the chamber improve with respect to temperature distribution while the core of the chamber maintains excellent uniformity characteristics regardless of damper position.

Pressurization of the chamber typically is a factor when the chamber is loaded heavily. The best uniformity results, with respect to the product, are achieved when no more than two-thirds of any inside chamber dimension are used. The best overall results are achieved when the product(s) are located in the center of the chamber.

Cool-Down Rates

The more open the damper, the faster the cool-down.

3.3. The Protocol 3 Controller

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

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

The Protocol 3 controller provides three primary operating modes:

 Manual: Oven operates continuously at a fixed temperature until turned off.

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LAC Series Oven Owner’s Manual THEORY OF OPERATION Version 1 21

 Timer: Oven operates at a fixed temperature for a user-selected time period, and then

automatically turns off.

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

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

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

Figure 5. Protocol 3 Controller Operator Interface.

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.

ASSEMBLY & SETUP LAC Series Oven Owner’s Manual

Caution!

Do not tilt oven while lifting or 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:

 LAC1-10: Two

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

 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 using lower corners.

 LAC1-67, LAC2-12

& LAC2-18: Do not lift by hand. Lift with fork lift and transport pallet.

22 Version 1

4. Assembly & Setup

Assembly and Setup provides directions for unpacking and installing your LAC-7 Series oven.

4.1. Unpack & Inspect the LAC-7 Series Oven

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

 Note condition of carton and plastic cover sheet inside carton.  Observe all outside surfaces and corners of the oven for scratches and dents.  Check 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.

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

LAC Series Oven Owner’s Manual ASSEMBLY & SETUP

Warning!

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

Warning!

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

Version 1 23

4.1.1. If Damaged During Shipping

If damage occurred during shipping:

1. Contact the shipper immediately and file a written damage claim.

2. Contact Despatch Industries (1-800-473-7373 or 1-952-469-8230 or service@despatch.com)

to report your findings and to order replacement parts for those damaged or missing. Send a copy of your filed damage claims to Despatch industries (Despatch Industries, 8860 207th Street, Lakeville, MN 555044, USA).

3. Check the packing list to ensure you received all the specified components of the oven

system. If any items are missing, contact Despatch Industries to have missing products forwarded to you. Your shipment should include:

 One (1) Despatch oven  One (1) Instruction manual and Protocol 3 Manual  Two (2) Shelves

4.2. Set-Up the LAC-7 Series Oven

4.2.1. Select Oven Location/Operating Environment

The Despatch LAC-7 Series oven is designed to operate in an industrial setting. Despatch recommends the following environmental operating guidelines:

1. Place the oven on a flat, level solid foundation.

2. Do not expose the oven to excessive external vibration.

3. Keep equipment away from flammable materials.

4. Do not remove electrical cabinet covers.

5. Where excessive particulate matter is present, such as on a construction site or coal

processing, Despatch recommends periodic (usually monthly) cleaning of all electrical compartments.

6. Ensure the power supply meets Despatch specifications. If the facility power supply is not

stable, Despatch recommends a line conditioner.

4.2.2. Set-up Procedure

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ASSEMBLY & SETUP LAC Series Oven Owner’s Manual

Caution!

Do not tilt oven while lifting or 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:

 LAC1-10: Two

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

 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 using lower corners.

 LAC1-67, LAC2-12

& LAC2-18: Do not lift by hand. Lift with fork lift and transport pallet.



Read the Model LAC-7 name plate (top of oven or top of control area under the door) for proper power requirements before proceeding with wiring and power connections. See example below (Figure 6).

24 Version 1

1. Place oven on bench top or optional cabinet base. a. Ensure a minimum of two (2) inches (5.1 cm) clearance in the rear of oven to provide

proper ventilation. The oven may be placed next to another cabinet, or next to another oven, with three (3) inch (7.6 cm) clearance (the doors will still open).

b. Ensure oven is level and plumb for proper heat distribution and operation of all

mechanical components.

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

3. Plug or hardwire oven directly to the electric supply.

4.2.3. Wiring & Power Connections

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LAC Series Oven Owner’s Manual ASSEMBLY & SETUP

Danger!

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



For units that must be hardwired or where a power cord is shipped loose, run the power lines from the rear of the oven to the front control panel.

Figure 6. LAC2-18-7 Nameplate.

Version 1 25

Models LAC 1-10, 1-38A, 1-38B, and 1-67 come equipped with an appropriate plug and cord. Models LAC 2-12 and 2-18 must be hardwired to the electric supply using 10 AWG or larger wires suitable for at least 75 °C (167 °F).

4.2.3.1. Wire LAC-7 Models 2-12 and 2-18

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ASSEMBLY & SETUP LAC Series Oven Owner’s Manual

Power cord fitting or conduit

Access plate to assist in tightening conduit fitting

Figure 7. Rear Access Panel for Hard-Wired Connections. Figure 8. Hinged Panel for Simpler Access to Power Connections.

26 Version 1

1. Open the knock-out near the rear-access panel (Figure 7).

2. Turn hinged front panel latches ¼ turn for easy access to access power connection (Figure 8).

3. Connect power at main circuit board (access by opening hinged control panel), terminals L1 and L2 (Figure 9). a. Tighten terminals on the circuit board to 10.6 to 13.2 lb-in (1.2 to 1.5 Nm) b. Attach the ground wire to the ground buss on the panel. c. Close hinged control panel after attaching the power supply wires or cord.

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LAC Series Oven Owner’s Manual ASSEMBLY & SETUP

Connect power at main circuit board terminals L1 and L2.

Figure 9. Power Connections at Main Circuit Board.

Version 1 27

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.

OPERATION LAC Series Oven Owner’s Manual



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 safety standards in OSHA and National Fire Protection Association (NFPA), Section 86 of 1990.

Notice

Before using any cleaning or decontamination method except those recommended by the manufacturer, users should check with the manufacturer that the proposed method will not damage the equipment.



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.

Warning!

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.

Warning!

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

28 Version 1

5. Operation

5.1. Load Oven

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LAC Series Oven Owner’s Manual OPERATION

Caution!

Always place loads on the shelves provided to avoid possible uneven heating and damage to the oven.

Warning!

Do not use flammable solvent or other flammable material in this oven. Do not process closed containers of any substance or liquid in this oven because they may explode under heat.



For fastest oven heat-up time, close the fresh-air vent. After the desired temperature is reached, the vent may be adjusted as needed.

Version 1 29

Avoid spilling on the heater elements or oven floor when loading the oven. Do not place the load on the oven floor plate. Placing the load on the oven floor may cause the load to heat unevenly and the weight may cause shorting out of the heater elements. Use the shelves provided.

The two shelves are designed to be pulled out about halfway without tipping. Do not overload the shelves (Refer to Support Capacity listed in Section 1.5.2). Distribute the workload evenly so 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.

5.2. Pre-Startup Checklist

 Know the system. Read this manual carefully. Make use of its instructions and explanations.

Safe, continuous, satisfactory, trouble-free operation depends primarily on your degree of understanding the system and your willingness to keep all parts in proper operating condition.

 Check line voltage. Voltage must correspond to nameplate requirements of motors and

controls. A wrong voltage can result in serious damage. Refer to Section 1.5.4 for more information.

 Check fresh air and exhaust openings. Do not be careless about restrictions in and around the

fresh air and exhaust openings and stacks. Under no condition can they be permitted to become so filled with dirt that they reduce airflow.

 Ventilation. An exhaust opening in the rear of the unit is covered by a hat bracket. Do not

remove the hat bracket as it protects the exhaust opening from being completely covered.

 For drying ovens, open vent to prevent buildup of moisture.  For sample heating, close vent when no ventilation is required.

5.3. Operating Procedure

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OPERATION LAC Series Oven Owner’s Manual

30 Version 1

5.3.1. Start Oven

1. Start fan a. Open oven door b. Press Power Switch to ON (Figure 1). Listen for the recirculating fan to start. c. Shut oven door d. Check that control display turns ON.

2. Operate temperature control as desired by following the control operation instructions to follow.

5.3.2. Working with Protocol 3 Operating Modes

Refer to the Protocol 3 Controller Owner’s Manual for specifics on working with the controller.

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

LAC Series Oven Owner’s Manual MAINTENANCE

Danger!

Use PPE and follow standard safety protocols when working with solvent and other chemicals.

Warning!

Do not attempt any service on this oven before opening the main power disconnect switch.

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.

Version 1 31

6. Maintenance

Only qualified and trained personnel should perform maintenance or repair. Maintenance tasks should be performed with appropriate proper personal protective equipment (PPE). Appropriate PPE includes safety glasses, rubber gloves for handling chemicals, high-temperature gloves for handling hot parts, and a dust mask for working with insulation.

6.1. Checklist

 Keep equipment clean. Gradual dirt accumulation retards airflow. A dirty oven can result in

unsatisfactory operation such as unbalanced temperature in the work chamber, reduced heating capacity, reduced production, overheated components, and the like. Keep the walls, floor and ceiling of the oven work chamber free of dirt and dust. Floating dust or accumulated

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.

MAINTENANCE LAC Series Oven Owner’s Manual

Notice

Clean quickly for maximum surface protection. Using water that contains chlorine or hydrochloric acid to clean

may damage the oven. Choose a neutral cleaning agent instead.

Warning!

Do not clean oven without first disconnecting power.

32 Version 1

dirt may produce unsatisfactory work results. Keep all equipment accessible. Do not permit other materials to be stored or piled against it.

 Protect controls against excessive heat—particularly controls, motors or other equipment

containing electronic components. Temperatures greater than 51.5°C (125°F) should be avoided.

 Establish maintenance and checkup schedules. Do this promptly and follow the schedules

faithfully. Careful operation and maintenance will be more than paid for in continuous, safe and economical operation.

 Maintain equipment in good repair. Make repairs immediately. Delays may be costly in

added expense for labor and materials and in prolonged shut down.

 Practice safety. Make it a prime policy to know what you are doing before you do it. Make

caution, patience, and good judgment the safety watchwords for the operation of your oven.

6.2. Lubrication

Fan motor bearings are permanently lubricated. All door latches, hinges, door operating mechanisms and bearing or wear surfaces should be lubricated to ensure easy operation.

6.3. Cleaning and Decontamination

6.3.1. Cleaning the LAC-7 Series Oven

For best product results, clean the oven monthly. To clean the oven:

1. Wipe all surfaces with a moistened towel or use a neutral cleaning agent.

2. Use a moistened towel to remove cleaning agents when finished.

3. Dry oven completely before turning it on again.

Clean stainless steel surfaces quarterly. To clean stainless steel surfaces:

1. Remove stains or spots with MEK (Methyl-Ethyl-Ketone).

2. Immediately after using MEK, wash steel surface using a polyurethane cloth or sponge

with clean water and liquid detergent.

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LAC Series Oven Owner’s Manual MAINTENANCE

Notice

Before using any cleaning or decontamination method except those recommended by the manufacturer, users should check with the manufacturer that the proposed method will not damage the equipment.



If necessary, remove highly contaminated inner chamber parts for cleaning or exchange.

Warning!

Do not decontaminate oven without first disconnecting power. Ensure adequate personal safety while decontaminating oven.

Danger!

Explosive gases may form during decontamination. Dry and ventilate oven before start-up to avoid explosions.

Version 1 33

6.3.2. Decontaminating the LAC-7 Series Oven

For best results, decontaminate the work zone daily.

1. Wipe all work surfaces with an appropriate disinfectant.

2. Use a neutral cleaning agent. Do not use acidic or chlorine cleaning detergents as they

may damage or corrode the oven.

6.4. Routine Tests

Test LAC-7 Series oven functions regularly and carefully for best performance. Safety of personnel and maintenance of your equipment may depend on the proper operation of any of the temperature control functions.

 Check that the heater LED is cycling on and off, indicating the heater is working.  Check the High Limit function to make sure it is working properly:

1. Press Select and go to Manual Mode. Enter a control setpoint value at least 11°C (20°F)

lower than the current process temperature.

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MAINTENANCE LAC Series Oven Owner’s Manual

Global Headquarters

Contact

Service & Technical Support

Despatch Industries

8860 207th Street Lakeville, MN 55044 USA

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

Service: 1-952-469-8230 US toll free: 1-800-473-7373 Fax: 1- 952-469-8193 Service @despatch.com

Warning!

Disconnect the main power switch or power cord before attempting any repair or adjustment.

34 Version 1

2. Press Menu and lower the High Limit setpoint to a value just below the current process

temperature.

3. Press Run.

4. The High Limit alarm indicator will flash and a High Limit alarm message will display.

5. Press Stop.

6. Press Reset.

7. Return the control setpoint and High Limit setpoint values to their original values.

6.5. Door Adjustment

To increase or decrease latch tension, or to gain a better door seal on the latch side:

 Turn the door strike in or out on its threads by loosening the Allen head set screw.  If necessary, adjust the vertical alignment of the strike to increase or decrease latch tension.

1. Loosen the two screws on the latch strike and sliding the strike up or down on its slots.

2. After positioning the strike, tighten the screws.

6.6. Replacement Parts

To order or return parts, contact Despatch Service & Technical Support. When returning parts, a Despatch representative will provide an MRA (Material Return Authorization) number. Attach the MRA number to the returned part for identification. When ordering parts, expedite the process by giving the model number, serial number and part number.

6.6.1. Replace the Protocol 3 Controller

Refer to the Protocol 3 Owner’s Manual for instructions on replacing the Protocol 3 controller.

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LAC Series Oven Owner’s Manual MAINTENANCE



Before disconnecting leads, carefully diagram (or note) which wires connect to which terminals.

Figure 10. Remove Screws to Remove Floor Plate.

Figure 11. Heater Panel and Inlet Cone.

Figure 12. Remove Screws to Remove Side Panels.

Version 1 35

6.6.2. Replace Heater Unit

Tools needed: 3/8" wrench, T20 Torx bit driver

1. Remove the floor plate.

a. Remove the

screws from the floor plate

(Figure 10).

b. Lift the floor plate out of the oven to

expose heater panel/inlet cone (Figure

11).

2. Remove side walls by removing the screws on the front

edge of each panel (Figure 12).

3. Disconnect the heater leads from heater element with

wrench.

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MAINTENANCE LAC Series Oven Owner’s Manual



Before disconnecting leads, carefully diagram (or note) which wires connect to which terminals.

Figure 13. Remove Heater Panel by Removing

Screw in Front Edge of Each Panel.

36 Version 1

4. Unscrew the screws holding the heater frame to the oven body (Figure 13).

5. Remove heater and discard.

6. Screw down the new heater frame.

7. Attach the heater leads to appropriate terminals.

8. Replace and screw in interior floor and side

panels.

6.6.3. Replace Fan Motor

Tools needed: T20 Torx bit driver, 5/32 inch Allen wrench, one quarter (¼) inch socket set

1. Remove the floor plate.

a. Remove the screws from the floor plate (Figure 10). b. Lift the floor plate out of the oven to expose heater panel/inlet cone (Figure 11). c. Lift the floor plate out of the oven to expose heater panel/inlet cone (Figure 11).

2. Remove side walls by removing the screws on the front edge of each panel (Figure 12).

3. Disconnect the heater leads from heater element with wrench.

4. Unscrew the screws holding the heater frame to the oven body (Figure 13).

5. Unplug the motor harness from the circuit board and remove motor and heater ground

wires from ground stud.

6. Unplug heater leads from circuit board and thermocouple leads from control.

7. Pull off fresh air damper handle from damper arm.

8. Remove screws holding fresh air damper arm assembly to control panel.

9. Remove the chamber floor plate.

a. Remove the screws from the floor plate. b. Lift the floor plate out of the oven.

10. Remove the left side wall.

11. Remove fan and heater plug assembly from oven by lifting on the air outlet of the

assembly and pushing from underneath.

12. Remove heater (do not disconnect wires).

13. Remove the fan inlet plate.

14. Loosen the set screws (2) on fan wheel and remove wheel.

15. Remove the screws (4) holding the fan motor in place.

16. Remove the fan motor.

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LAC Series Oven Owner’s Manual MAINTENANCE Version 1 37

17. Install the fan motor.

a. Insert shaft seal onto shaft. b. Insert the shaft into shaft collar. c. Fasten motor to plug assembly with the four screws.

18. Install fan wheel onto motor shaft.

19. Replace and fasten the fan inlet cover.

20. Adjust the fan wheel for 3/16 inch clearance between the wheel and the inlet ring and

tighten the set screws on the fan wheel. Check that the set screws hit the flats machined into the motor shaft.

21. Replace and fasten heater.

22. Replace fan and heater plug assembly in oven body.

23. Replace left side wall.

24. Replace and fasten floor plate.

25. Replace fresh air damper arm assembly.

26. Replace fresh air damper handle.

27. Connect heater leads to circuit board.

28. Connect motor wire harness and fasten motor and heater ground wires to ground stud.

29. Connect thermocouple wires to control.

30. Replace control panel in oven body.

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MAINTENANCE LAC Series Oven Owner’s Manual

Symptom

Possible Cause

Next Step

Failure to

heat or

heats to only 35-50 degrees C

No power

Check power source and/or oven and wall fuses.

Broken or frayed cord

Replace with new cord.

Burned out heater

Replace heater (see Warranty Section 8.1).

Protocol 3 controller malfunction

Replace controller.

Loose wire connections

Disconnect power and check connections behind control panel.

Heater relay failure

Replace circuit board.

Door switch failure

Replace door switch.

Slow heat-

up

Improperly loaded

Reduce load or redistribute load in chamber.

Low line voltage

Supply sufficient power and proper connections. Check for circuit overload.

Heating element(s) are burned out

Replace burned out element (see Warranty Section

8.1).

240 volt oven is connected to a 208V line

Raise line voltage to a 240 volt line or modify oven for 208V operation (consult factory).

Fan motor failure

Replace fan motor.

Frequent

heater

element out

Harmful fumes generated by load

Increase vent opening or discontinue process.

Spillage or splattering of material on heater elements

Disconnect power and clean oven chamber and elements. Overheating oven

Check the High Limit.

Erratic or

inaccurate

temperature Protocol 3 controller

malfunction

Replace Protocol 3 controller.

Improper tuning parameters

Check tuning parameters.

Protocol 3 controller miscalibration

Recalibrate Protocol 3 controller (See Protocol 3 Owner’s Manual, sections on Calibration).

High Limit setting

High Limit should be 10-25°C higher than setpoint.

Improper offset

Check zone calibration.

Excess

surface or

door

temperature

Door seal deterioration

Replace door seal.

Improper

airflow

Fan motor failure

Replace fan motor.

Fan wheel seated too low on fan shaft

Adjust fan wheel for 3/16" clearance between wheel and inlet ring.

Unbalanced fan wheel

Replace fan wheel.

Excessive

vibration

Dirty fan wheel

Clean fan.

Unbalanced fan wheel

Replace fan wheel.

38 Version 1

7. Troubleshooting

7.1. Troubleshooting Symptoms

Table 2 lists symptoms, probably causes and suggested remedies. Table 3 shows how to troubleshoot the control panel mounted circuit board.

Table 2. Troubleshooting Oven Symptoms.

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LAC Series Oven Owner’s Manual TROUBLESHOOTING

Symptom

Possible Cause

Next Step

Oven will not control at setpoint

High Limit set too low

Set the High Limit higher.

Protocol 3 controller malfunction

Replace controller. SSR malfunction

Replace SSR and/or check control output voltage.

Air friction of recirculation fan

Open exhaust air vent. Unit will not control below minimum operating temperature with vent closed.

Heater

does not shut down until temp.

reaches the

High Limit

setting

Protocol 3 controller malfunction

Replace Protocol 3 controller. SSR malfunction

Replace SSR.

If LED is…

Check…

1 LED

2LED

3 LED

Not Lit

Check Fuse Block 2F and 3F (Figure 14)

Lit

Not lit

Lit

 Check High Limit  Check optional door switch, if appropriate

Lit

 Check Fuse Block 1F and 4F (Figure 14)  Check SSR  Check heater  Check heater relays

Danger!

Table 3 lists troubleshooting steps that must be performed by a qualified electrician or electrical technician trained on electrical safety and the use of personal protective equipment.

Figure 14. LAC-7 Circuit Board.

Version 1 39

Table 3. Troubleshooting with Control Panel Mounted Circuit Board.

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TROUBLESHOOTING LAC Series Oven Owner’s Manual

Alarm Status

Possible Problem

Next Step

HI LIMIT LED ON

 Problem with thermocouple  High Limit setpoint has

been exceeded.

Once the problem has corrected, press

RESET.

DEV HOLD LED flashing

Oven temperature has not entered (or dropped out of) the Auto Hold band and the soak timer has stopped

Program a slower ramp rate or if oven is not heating check heater circuit. Top PV displays OPEN

Control thermocouple is disconnected or broken

Repair or replace the thermocouple.

HLPV displays OPEN

High Limit thermocouple is disconnected or broken

Repair or replace the thermocouple.

Danger!

Electrical panels contain high voltage. Turning the power switch off on the oven does not de-energize the circuit board. Disconnect and lock out the power supply before working on the circuit board. Failure to lock out the power supply can result in death or injury.

40 Version 1

7.2. Troubleshooting Error Messages and Alarms

Table 4 lists the more common error messages, possible problems and remedies.

Table 4. Error Messages and Next Steps.

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LAC Series Oven Owner’s Manual APPENDICES Version 1 41

8. Appendices

8.1. Standard Products Warranty

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APPENDICES LAC Series Oven Owner’s Manual



Refer to instructions provided by the recorder manufacturer for more specific installation notes.

Parameter Code

Degrees C

Degrees F

Inps

18

Icor 0 0

diSP

On

dPOS

0

EUU6

400

752

EUL6

0

32

ChUP

400

8007

ChLO

0 0 DFF

1

6

7

42 Version 1

8.2. LAC-7 Series Oven Options

8.2.1. Optional MRC5000 Recorder Setup

Temperature is retransmitted to the MRC5000 recorder from the controller. To set up the recorder:

1. Ensure hardware jumper JU1 is in place for the 5 VDC setting (Refer to MRC5000 Manual

included).

2. Move MODE to PROG/TEST/CAL to display Prog.

3. Press ▼ twice to display Inps. Move to each Parameter Code using ▼or ▲. Adjust each

Parameter Code using the settings in Table 5.

4. After adjusting all settings, move MODE to RUN. Display on both the recorder and controller

should read the same.

Table 5. MRC 5000 Settings.

These values must match the settings RetOutLo and RetOutHi on the Protocol 3 control page. For

example, if RetOutLo is 32, EUL must read 32.

Change 0-400 chart paper to 0-800 chart paper. Depending on the equipment used, 0-600 paper may be

used if the maximum temperature is 500°F.

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LAC Series Oven Owner’s Manual APPENDICES



When the alarm is triggered by the end of cycle, the alarm will continue to be active until another process is started.

Version 1 43

8.2.2. Optional Pneumatic and Electronic Door Lock

The LAC-7 Series oven pneumatic and electronic door lock option prevents the door from being opened if a Protocol 3 controller event is active.

8.2.3. Optional Interior Light

The LAC-7 Series oven optional interior light allows users to see inside the oven during operation. The interior lights uses a 50W bulb mounted inside the oven. Control the optional interior light using the ON/OFF switch mounted on the oven control panel (labeled “INTERIOR LIGHT”).

8.2.4. Optional Door Interlock Switch (Controls Heater & Fan)

The LAC-7 Series oven optional door interlock switch automatically shuts OFF either the heater only or both the heater and fan when the door is opened. This option provides an extra measure of safety for the user.

8.2.5. Optional High Limit Alarm with Alarm Silence

The LAC-7 Series oven optional High Limit Alarm provides an audible and visual alarm when the temperature exceeds the High Limit setpoint on the control. The alarm horn is typically located to the right of the control panel door.

When the chamber temperature exceeds the High Limit setting on the control, the heater shuts down, the alarm horn sounds and the red push button switch will illuminate.

To silence the alarm:

1. Depress the Alarm Silence switch. a. This silences the alarm horn. b. The red push button switch remains illuminated.

2. Clear the alarm by correcting the High Limit condition.

3. When the High Limit condition clears, press Reset on the control. See Protocol 3 Owner’s

Manual for detailed operation.

4. The red push button switch will go off, the heater switches on and the control is functioning

correctly.

5. If the High Limit trips repeatedly, identify the cause and correct the problem.

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.

APPENDICES LAC Series Oven Owner’s Manual

Danger!

Use care when working with nitrogen. Nitrogen presents an asphyxiation hazard. Handle nitrogen according the safe handling procedures listed in the material safety data sheet (MSDS).

44 Version 1

8.2.6. Optional Forced Exhaust

The LAC-7 Series oven optional forced exhaust allows increased cooling by using an extra fan. The forced exhaust is triggered by an event or by pressing Exhaust Fan on the control panel—or both. Find more information about exhaust and the LAC-7 Series ovens in Sections 3.1, 3.2 and

5.2.

8.2.7. Optional Clean Dry Air (CDA)/Nitrogen

The LAC-7 Series oven optional CDA/Nitrogen provides clean dry air or inert gas for moisture removal. CDA helps drive off moisture. Nitrogen helps drive off moisture and/or provide a light blanket of nitrogen. Using nitrogen does not create low oxygen content—since this is an air unit it always contains a small amount of fresh air exchange and the internal seams are not welded. Flow is controlled by a solenoid valve turned ON or OFF through an Event in the Protocol 3 controller.

8.3. Electrical Schematics

The following pages contain electrical schematics and data for the LAC1-10-7, LAC1-38A-7, LAC1-38B-7, LAC1-67-7, LAC2-12-7 and LAC2-18-7 ovens.

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

LAC Series Oven Owner’s Manual APPENDICES

Figure 15. LAC1-10-7, 120V (Drawing 313904A01).

Version 1 45

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.

APPENDICES LAC Series Oven Owner’s Manual

Figure 16. LAC1-38A-7, 120V (Drawing 313906A01).

46 Version 1

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

LAC Series Oven Owner’s Manual APPENDICES Version 1 47

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

APPENDICES LAC Series Oven Owner’s Manual

Figure 17. LAC1-38B-7, 208V (Drawing 320160A01).

48 Version 1

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

LAC Series Oven Owner’s Manual APPENDICES

Figure 18. LAC1-38B-7, 240V (Drawing 320125A01).

Version 1 49

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.

APPENDICES LAC Series Oven Owner’s Manual

Figure 19. LAC1-67-7, 208V (Drawing 320162A01).

50 Version 1

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LAC Series Oven Owner’s Manual APPENDICES

Figure 20. LAC1-67-7, 240V (Drawing 313907A01).

Version 1 51

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.

APPENDICES LAC Series Oven Owner’s Manual

Figure 21. LAC2-12-7, 208V (Drawing 320164A01).

52 Version 1

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

LAC Series Oven Owner’s Manual APPENDICES Version 1 53

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

APPENDICES LAC Series Oven Owner’s Manual

Figure 22. LAC2-12-7, 240V (Drawing 313908A01).

54 Version 1

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LAC Series Oven Owner’s Manual APPENDICES

Figure 23. LAC2-18-7, 208V (Drawing 320166A01).

Version 1 55

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APPENDICES LAC Series Oven Owner’s Manual

Figure 24. LAC2-18-7, 240V (Drawing 313905A01).

56 Version 1

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LAC Series Oven Owner’s Manual APPENDICES Version 1 57

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LAC Series Oven Owner’s Manual 58 Version 11

3rdDraft—

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

Despatch LAC2-12-7 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual