Operation l 4-23
Using Dewpoint Control
Dewpoint control is a feature that can help you to reduce energy consumption. It
does this by varying the temperature of the regeneration air from its default set-
point of 350° F {177
° C}, to maintain a setpoint that you have entered on the
process dewpoint screen (Screen 11).
Example:
If your material is not difficult to dry, it may dry adequately with -20° F
{-29
° C} dewpoint air. When -20° F {-29° C} is entered as the setpoint (Screen
11), the dryer will gradually lower the regeneration air temperature to a point
where the dryer’s delivery air is controlled at -20
° F {-29° C} dewpoint.
The dewpoint control is active with setpoint values of -39
° F {-39.4° C} and
higher. When the setpoint is -40
° F {-40
° C} or lower, the regeneration tempera-
ture will be maintained at the default temperature of 350
° F {177° C} and the
dewpoint control is inactive.
4
Operation
NOTE: For more information concerning specific dewpoint control screens, see Control
Function Descriptions, page 4-5.
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