Method and apparatus for control of air flow to a plurality of rooms
Apparatus and method for controlling the temperature of a space
Zoned control system
Air conditioning apparatus
Temperature control system for air conditioning system
Method and system for controlling a single zone HVAC supplying multiple zones
Relay panel and system for controlling zoned heating and cooling systems
Air conditioning apparatus
Central air conditioning system having remote controller in a plurality of rooms for starting or stopping air conditioning apparatus
ApplicationNo. 896133 filed on 07/17/1997
US Classes:165/217, Volume flow of discharged air at discharge into zone modulated by zone heating or cooling load (e.g., variable air volume, etc.)165/207Refrigeration system having an evaporator or condenser in each zone
ExaminersPrimary: Lazarus, Ira S.
Assistant: Chandler, Lance W.
Attorney, Agent or Firm
International ClassF24F 003/00
AbstractA control assembly for a HVAC system serving a plurality of zones within a structure, having ducting including a damper situated in an outlet of the ducting leading to each zone, a biasing element biasing the damper in a normally open position, and a motor coupled to each damper for closing each damper. A standard manual or automatic change-over thermostat is situated in each of the zones which includes at least a heating signal output and a cooling signal output. The control assembly formed by a collection of diodes and relays includes a pair of relays having a set of normally open contacts coupled between the damper motors and a source of power, one of the pair of relays having a coil coupled to the heating signal outputs of all of the thermostats and another of the pair of relays having a coil coupled to the cooling signal outputs of all of the thermostats so that, upon initiation of a heating or cooling signal from any of the thermostats, power is applied to the motor coupled to each damper for closing each damper. The control assembly includes individual zone controls each of which are formed by a collection of diodes and relays including a first additional relay which has a set of normally closed contacts coupled between the damper motor in the zone and the source of power, and a coil coupled to the heating and cooling signal outputs of the thermostat in the zone so that the initiation of a heating or cooling signal by the zone thermostat opens the normally closed contacts of the first additional relay thus preventing power from being applied to the damper motor leading to the zone thereby permitting the damper to remain open under influence of the biasing element. A second additional relay has a set of normally closed contacts coupled between the cooling signal output of all the thermostats and a control unit controlling the application of power to the cooling unit, and a coil coupled to the heating signal output of all the thermostats so that initiation of a signal from a heating signal output of any of the thermostats prevents the application of power to the cooling unit thus achieving automatic change-over between heating and cooling.
Field of SearchCentral system prioritizes heating and cooling requests from zones
Supervisory central control means overrides zone controller
Volume flow of discharged air at discharge into zone modulated by zone heating or cooling load (e.g., variable air volume, etc.)
Having heating and cooling capability