04487363 is referenced by 37 patents and cites 3 patents.

A bypass control system and method monitors and controls the amount of air recirculated through a bypass duct from the air supply outlet supplied by a fan and motor from a single zone HVAC unit to the air intake thereof, a stepper motor driven bypass damper is located in the bypass duct having a damper blade movable between opened and closed positions and intermediate positions therebetween, and a bypass monitor is connected to the bypass damper for controlling the operation of the stepper motor of the bypass damper. A first amperage sensor is looped around the common lead of the motor and the monitor provides information indicative of the amount of work performed by the motor to the monitor, the motor performing less work when static air build up occurs at the outlet due to closure of dampers in the duct system conditioning air to a plurality of zones, and the monitor causes the bypass damper to open to correspondingly compensate for the static air pressure build up by reducing same and causing more air to be recirculated through the bypass duct to maintain the air pressure supplied by the HVAC unit to the duct system generally constant.

Title
Bypass control system to maintain a constant air supply pressure in a HVAC duct system
Application Number
454483
Publication Number
4487363
Application Date
February 28, 1983
Publication Date
December 11, 1984
Inventor
Edward Parker
Jacksonville
FL, US
Jeffrey L Parker
Jacksonville
FL, US
Agent
Arthur G Yeager
Assignee
Parker Electronics
FL, US
IPC
F24F 7/00
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