Abstract: A system or method that has an air distribution system configured to provide nitrogen into a room to reduce an oxygen concentration level within the room below a desired oxygen concentration level such that the atmosphere in the room fails to provide sufficient oxygen to sustain combustion.

Abstract: A system or method that has an air distribution system configured to provide nitrogen into a room to reduce an oxygen concentration level within the room below a desired oxygen concentration level such that the atmosphere in the room fails to provide sufficient oxygen to sustain combustion.

Abstract: A system or method that has an air distribution system configured to provide nitrogen into a room to reduce an oxygen concentration level within the room below a desired oxygen concentration level such that the atmosphere in the room fails to provide sufficient oxygen to sustain combustion.

Abstract: A valve controller for a hot water heating system having a water heating device, a water circulating device, and heater device. The Controller operates a water control valve between an open and a closed position, the valve controller comprising, a flow timer for variably establishing flow periodicity between a minimum flow time and a maximum flow time, a base cycle timer for variably establishing base cycle periodicity between a minimum base time and a maximum flow time. The base timer variably establishes a base cycle periodicity between a minimum base time and a maximum base time. A selector responsive to heat requirements for select a flow time and base cycle time.

Abstract: A hot water heat control system for a building having a given boundary layer heat loss characteristic is described. The heating system, which includes a water heating device, a water circulation loop, and a mechanism for varying the amount of heat to the loop, is controlled by a unique valve arrangement. In the best mode, the valve arrangement controls the water temperature supplied to the perimeter heater in response sensed changes of ambient environmental conditions. In one system configuration, a controller is used to control the flow of heated circulating water in response to the sensed weather parameters. The valve controller has a flow timer for variably establishing flow periodicity between a minimum flow time and a maximum flow time. The valve controller also has a base cycle timer for variably establishing base cycle periodicity between a minimum base time and a maximum base time.

Abstract: A modular power controller assembly is described for providing the application of power to resistive loads. The controller assembly comprises an enclosure for mounting controller modules, one or more modular heat-sinks, a plurality of SCR modules arranged in sets with each set on a corresponding heat sink, a timer board for controlling the percentage of time in the on-condition, and a driver board for switching each set of SCR modules. The timer board provides a controlled signal which optocoupled at the driver board with the gate of the corresponding SCR module. The SCR's switching is conducted at the zero cross over level thereby avoiding radio frequency interference.