Despatch LAC2-12-5 - Manual (Page 15)

6
Damper Control
The oven is equipped with a manually adjustable damper mechanism. The damper
control arm is located on the front panel of the oven. 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.
Determining Damper Settings
The optimum setting for the damper depends on several factors. These factors include
ambient environment temperature, load conditions, load distribution, heat up rates, cool
down rates, desired temperature uniformity and most importantly the desired operating
temperature. To consider all of these variables at any one point in time is not practical
and there are engineering tradeoffs that should be considered. Therefore guidelines
should be used to determine the damper setting.
In general, the damper should be set so that the amount of fresh air flowing into and
exhausting from the chamber agrees with the desired operating temperature conditions.
The following outline shows the considerations involved with various damper position
settings.
Full Closed Position
When the damper is in the full closed position, the chamber will be able to achieve the
maximum attainable heat up rates for the chamber. In addition, the chamber will use
the minimum amount of power to operate at the desired temperature. In almost all
cases, the damper should be in the full closed position in order to efficiently operate at
the maximum operating temperature for the chamber.