Abstract: The invention is directed to programmable temperature control in which a controller may be programmed to control a thermal output of said temperature-modifying device, and to operate an air circulating system independently of the temperature-modifying device. The apparatus may incorporate a user input for entering air handling information to program the air circulating system to operate at predetermined intervals. The controller may be further programmed to receive air filtration information from the user input and to generate air filtration output information. The system may also be programmed to receive information regarding a characteristic of the air circulating system from an sensor for use in calculating the air filtration output information.

Abstract: A fluid tempering system for supplying tempered fluid to hot fluid distribution system, for example water at a constant temperature by controlling the amount of cold water from the cold water supply mixing with hot water from the water heater, to control the temperature of water in the hot water distribution system. The higher temperature water mixed with cold water reduces scalding hazard and also increases the volume of hot water, at a tampered temperature, within the hot water distribution system. The system also eliminates the slug in the tempering system.

Abstract: The plant has a controlled section through which water flows, for example, for cooling or heating purposes. The operation of the controlled section is controlled by obtaining temperature measurements of the flow via a pair of temperature sensors and emitting a control signal in response to a difference to a valve in a connecting line which is in parallel with the heat exchanger. The same signal is also directed to a comparator in a control circuit within which a second process variable, i.e. flow quantity, is measured. A comparison between these latter signals is made and a resulting difference signal is used by a controller to adjust a valve in the feed line to the heat exchanger to adjust the flow of medium.

Abstract: An instantaneous gas domestic hot water system incorporating a solar heating panel (80) connected to a hot water storage cylinder (81), the outlet from the hot water storage cylinder passing through a heating tube assembly (15) adapted to be heated by a gas burner (13). The outlet from the heating tube assembly is connected to a flow switch (4) and a temperature sensing device (14), the flow switch being connected through an electrical control system (10) to operate a control gas valve (11) and a main gas control (5) to control the flow of gas to a pilot burner (6) which is ignited on sensing of the flow of hot water (3) with the temperature sensing unit (14) controlling the control valve (11) to regulate the flow of gas to the main burner (13) to maintain the water at the water at the water at the outlet (83) at a desired temperature.

Abstract: A multichamber gas control valve modulates and controls the flow of gas to the burner of an instantaneous water heater. Flow of gas from an inlet chamber to a first chamber of the valve is controlled by a thermostatic valve and gas flow from the first to a second chamber is controlled by a temperature controller. Gas flow from the second chamber to an outlet chamber is controlled by a spring biased valve actuated by a diaphragm actuator operated in response to flow of water through a venturi in the water supply of the heater. The several chambers are in a common valve body closed by a removable cover to provide easy access to the components of the assembly.