LAC/LFC Series Oven Owner’s Manual THEORY OF OPERATION
Version 1.12 25
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.
3.3.1.1. 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.
3.3.1.2. 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.
3.3.1.3. Exhaust Damper Control for LFC-8
Adjusting the exhaust damper aids in pressuring the oven chamber
(Figure 7). The damper is designed so that it may never be fully
closed.
When the damper is in the full open position, the oven may not
be able to heat to the maximum oven operating temperature.
Over-pressurizing 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. Stop this hot air from entering the room by
closing the damper slightly until the air stops blowing.
Figure 6. Damper
Positions.
Figure 7. LFC Oven Exhaust Damper
Control.
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