LAC/LFC Series Oven Owner’s Manual THEORY OF OPERATION
Version 1.12 23
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
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retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
3.2. LFC Specific Operation
The LFC Class A oven is built from the base LAC laboratory oven. All required Class A-
compliant features and components are added to meet NFPA 86 requirements. Additions include:
Positive latch
Pressure relief panel
Purge timer
Recirculation fan airflow switch
Airflow switches and exhaust fan
The LFC Class A Oven owner/operator must take measures to ensure appropriate solvent levels
are observed and that the equipment is operated according to proper procedures outlined by the
NFPA and this manual.
The fresh air intake is designed such that when the intake damper is in the Closed position, it still
permits the minimum air into the system allowed by NFPA 86 requirements.
The exhaust damper is designed in the same manner as the fresh air intake: to ensure an adequate
air mixture, as well as to facilitate removal of solvent-laden air from the system.
An airflow switch is employed as a safety mechanism to ensure that airflow is not inadvertently
cut off. The purge timer ensures the chamber has made a sufficient number of exchanges to safely
turn on the heater at the start of a process. An explosion relief panel is required based on the
internal volume, temperature, and allowable solvent rating (for more information, refer to
specifications Section 1.5. The explosion relief panel provides for a safe and known outlet for
additional energy caused by an explosion or other pressure build up. The area around this panel
must be free of obstruction.
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.
All required Class A-compliant features and components are added to the
LCD Class A oven to meet NFPA 86 requirements. These added measures
are designed to safely handle volatile organics and other solvent byproducts.
These measures alone cannot guarantee safety.
Never block the fresh air intake.
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