Cascaded control apparatus for controlling unit ventilators

Details Cascaded control apparatus for controlling unit ventilators Cascaded control apparatus for controlling unit ventilators

G - Physics

05

D

G05D 23/19 (2006.01) F24F 11/00 (2006.01)

Patent

CA 2064153

CASCADED CONTROL APPARATUS FOR CONTROLLING UNIT VENTILATORS Abstract of The Disclosure A controller having two cascaded PID control loops in the control of unit ventilators of the type which have a heating coil, a fan, and a damper for admitting outside air into a room in which the unit ventilator is located. The controller utilizes the sensed room temperature and a room temperature set point to generate a set point for the temperature of the air being discharged from the unit ventilator, and utilizes the discharge temperature set point and the sensed discharge temperature to control the damper position and the operation of the heating coils of the unit ventilator.

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