F - Mech Eng,Light,Heat,Weapons – 24 – F
Patent
F - Mech Eng,Light,Heat,Weapons
24
F
137/34
F24F 7/06 (2006.01) F24F 11/04 (2006.01) F24F 13/00 (2006.01) G05D 23/185 (2006.01)
Patent
CA 1161523
IMPROVED AIR CONDITIONING CONTROL SYSTEM WITH MASTER AND TRACKING CONTROLLERS ABSTRACT An air conditioning control system for at least two duct sections each with an associated damper comprises at least one master controller for a first pneumatic actuator for one damper and at least one tracking controller for a second pneu- matic actuator for the other damper. The master controller comprises a first flow sensor producing a first flow variable signal in response to a sensed flow in the duct section asso- ciated with the said one damper. An adjustable reference or bias signal generator is provided and a temperature signal is com- bined therewith to provide a composite signal for comparison with the flow variable signal. A resultant signal after comparison operates the first pneumatic actuator for the said one damper. tracking controller comprises a second flow sensor producing a second flow variable signal in response to sensed flow in the duct section associated with the other damper. A second signal comparitor and transmittor receives the first and second flow variable signals, compares the two and transmits a second re- sultant signal to the second pneumatic actuator for control of the said other damper. The second comparitor includes a pivot- ally mounted lever acted upon by diaphragm actuated first and second push rods representing the first and second flow variable signals. One of the diaphragm assemblies is mounted for slid- able adjustment along the lever to vary the relative mechanical advantage and to vary the flow ratio between the two dampers and duct sections. The described system overcomes the limitations of the prior art by allowing for more accurate and co-ordinated flow rates in both duct sections. - 1 -
377271
Harris William J.
Waeldner William J.
Anemostat Products Division Dynamics Corporation Of America
Mestek Inc.
Ridout & Maybee Llp
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