THEORY OF OPERATION LAC/LFC Series Oven Owner’s Manual
24 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.
3.3. Damper Control
The LAC-8 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.
3.3.1. 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).
Danger!
Class A [LFC] ovens are designed for a specific amount of
solvent. Exceeding this amount could result in an explosion. Do
not process closed containers of any substance or liquid in this
oven because they may explode under heat. In case of fire, leave
door(s) as they are. Shut off electricity. Shut off fuel. Call the fire
department. Stay away.
For an LFC oven: with the air intake and exhaust dampers in full closed
position, a predetermined amount of fresh air enters the chamber via
cutaways in the fresh air and exhaust dampers. This amount of fresh air
meets NFPA86 Safety Guidelines for Class A ovens. The fresh air intake
and exhaust should NEVER be completely blocked or restricted.
To Next Page
Loading...
Need help?
General
