Induction air mixing box control
First Claim
1. Apparatus for controlling the volume rates of flow of conditioned primary air above atmospheric pressure and of secondary air entering an induction air mixing box having a first inlet for receiving the primary air, a second inlet for receiving the secondary air, means for inducing flow of said secondary air into the box in response to a flow of said primary air through the box, an outlet for said primary and secondary air exiting from the box for delivery to a condition controlled space, a first damper for solely controlling the volume rate of flow of said primary air into the box, and a second damper for restricting the volume rate of flow of said secondary air into the box, said apparatus comprising a first actuator for variably positioning said first damper, means responsive to the magnitude of a sensed volume rate of flow of said primary air for controlling operation of said first actuator such that the first damper is variably positioned to maintain a predetermined substantially constant volume rate of flow of said primary air, and a second actuator independent of said first actuator for variably positioning the second damper solely as a function of a sensed magnitude of a controlled condition in said condition controlled space.
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0 Petitions
Accused Products
Abstract
A control for an induction air mixing box for mixing conditioned primary air and induced secondary air for delivery at a substantially constant volume rate of flow into a condition controlled space, the volume rate of flow of primary air being maintained constant at a predetermined rate, said predetermined rate being resettable as a function of the sensed condition in the space. The induced rate of flow of secondary air is restricted as another function of the sensed condition, the change in rate of flow of the secondary air being inverse to that of the primary air.
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Citations
10 Claims
- 1. Apparatus for controlling the volume rates of flow of conditioned primary air above atmospheric pressure and of secondary air entering an induction air mixing box having a first inlet for receiving the primary air, a second inlet for receiving the secondary air, means for inducing flow of said secondary air into the box in response to a flow of said primary air through the box, an outlet for said primary and secondary air exiting from the box for delivery to a condition controlled space, a first damper for solely controlling the volume rate of flow of said primary air into the box, and a second damper for restricting the volume rate of flow of said secondary air into the box, said apparatus comprising a first actuator for variably positioning said first damper, means responsive to the magnitude of a sensed volume rate of flow of said primary air for controlling operation of said first actuator such that the first damper is variably positioned to maintain a predetermined substantially constant volume rate of flow of said primary air, and a second actuator independent of said first actuator for variably positioning the second damper solely as a function of a sensed magnitude of a controlled condition in said condition controlled space.
Specification