Abstract: A primary gas furnace control including a thermostatically controlled intermittent ignition system, the control being effective to monitor and control main gas valve action through use of flame rectification. The control features a slight delay on main valve dropout with flame failure and an extension of the ignition source into the main burner cycle to prevent nuisance recycling. If desired, the control may also include timed pilot valve, thermostat resettable, lockout as well as prepurge capability for use in applications requiring a furnace combustion chamber purge prior to an ignition cycle.

Abstract: A single blower/multiple burner control system including a burning chamber, having a plurality of burners disposed therein. An equal number of conduits extend from the burning chamber to a manifold being supplied with a constant supply of air under pressure. Each of the conduits receiving pressurized air has a fuel line which is connected at one end thereof to such corresponding air line and having the other end connected to a fuel manifold which is being supplied with a constant supply of fuel. Each of the fuel lines has an adjusting valve therein for adjusting the amount of fuel passing therethrough and each of the fuel lines also has a shut-off valve therein for permitting the fuel to be completely shut-off or to permit fuel to pass therethrough from the fuel manifold to the corresponding conduit leading to the corresponding burner.

Abstract: A furnace (A) defines a combustion chamber (10) in which a pair of burners (B) are mounted for oxidizing the fuel to heat the combustion chamber. An air blower (12) supplies air to the burners at a rate controlled by a rate control valve (18). A frequency modulated burner control system (C) controls the duty cycle of the burners, i.e. cyclically actuates the burner at a fixed burn rate and then deactuates them. The burner control system varies the actuation to deactuation ratio in each cycle to vary the thermal input to the combustion chamber. The burners provide two - stage combustion wherein a fuel rich mixture is partially oxidized in a first stage combustion area (44). Additional air which is thereafter introduced through air passages (50, 52) completes the combustion.

Abstract: A gas valve assembly has a safety valve and two controlled valves connected in series. A first of the controlled valves is electromatic and a second is a conventional pressure controlled valve. A control knob provides for manual control of the safety valve and for locking the first electromagnetically controlled valve in an off position. The manual control knob, when in the off and pilot positions, causes a stop member to be moved against the movable core member of the electromagnetic operator to hold the electromagnetic controlled valve in an off position.

Abstract: A water heater is disclosed having a main burner for heating a heat exchanger and a standing burner, and is also provided with an electromagnetic safety valve which is opened by a manual operation member and which is kept in its valve open condition by the electric current from a thermocouple element exposed to the standing burner and a water pressure sensitive member such that it opens in response to a supply of water to the heat exchanger (that is, the water flow is turned on). Both the electromagnetic safety valve and the water pressure sensitive valve are interposed in a fuel passage connected to the main burner. A standing burner fuel passage is connected on one end to the standing burner and is connected at its other end to a point located in between the two valves.

Abstract: The disclosure is directed to an improved catalytic combustion arrangement for use, for example, in a gas stove or the like, which has a heat insulation diffusion layer is provided in a catalytic mat layer for the improvement of combustion rate around the catalytic mat, and, through employment of two sets of thermo-couples, a heating burner for the catalytic mat is adapted to burn only during starting of combustion, and to be automatically extinguished upon arrival at a steady combustion state for continuous combustion only by the catalytic mat, with a simultaneous indication of such combustion.

Abstract: Upon a call for heat, gas flows to a pilot burner, a spark generating circuit is energized to ignite the pilot burner, and an oscillator is energized. When flame appears, the output signal of the oscillator is effective, through flame responsive means including capacitor means and solid-state switch means, to enable energizing of the primary winding of a coupling transformer at the frequency of the oscillator signal. When so energized, sufficient power transfer occurs between the primary and secondary windings of the coupling transformer to enable energizing of a relay winding, which energizing terminates energizing of the spark generating circuit and allows gas to flow to the main burner.

Abstract: A control system for heating installations which is responsive to a pre-selected target air temperature and a pre-selected radiant heat output.

Abstract: A valve rod of a gas heating device actuates not only a microswitch, but also a disc valve. A pilot burner and a main burner are separately controlled by individual solenoid operated valve which is serially connected. The disc valve is provided at the upstream of the pilot burner, and between two solenoid operated valves for safeguarding against the erroneous on-state of the microswitch. A sensor will, according to the presence of the pilot flame, instruct an electric control board to continue or discontinue the sparkling of an igniter, to open or close the solenoid valve for supplying gas to the main burner. Thus, the adversity of toxication caused by either the misfunction of microswitch or failure of valve actuation is able to be prevented.

Abstract: An improved nozzle spray type burner including a combustion chamber, a housing having an exhaust passage coupled to the combustion chamber, a fan mounted in the housing for directing air through the exhaust passage to the combustion chamber and a fuel spray nozzle in the exhaust passage for spraying fuel into the flow of air in the exhaust passage. The improvement includes a first mechanism associated with the fan to control the flow rate of air in the exhaust passage, and a second mechanism associated with the nozzle for controlling the amount of fuel sprayed from the nozzle. The first and second mechanisms are arranged to cooperate to control the degree of combustion of the fuel with the air in the combustion chamber.

Abstract: A control logic means or microcomputer controlled burner control system has been disclosed. The system utilizes a safety relay that has contacts that are in series with all of the other loads for the system. The safety relay contacts are checked prior to operation of the system to verify their ability to open the load circuit. The operation of the electronics for the control of the safety relay are regularly checked during the operation of the system by a combination of feedback circuits from the electronics, and from the final control element for the various loads.

Abstract: A control system for multiple burners or heaters in an afterburner section of a metal scrap dryer is provided. The control system provides for cascade and sequential control including selective and sequential ignition as well as selective and sequential deenergization of the burners or heaters.

Abstract: A fuel burner sequencing means is disclosed which utilizes a bistable or alternate action switching means for safety checking. The bistable switching means is specifically disclosed as a bistable relay that operates at the start of the cycle, and at the end of the cycle to check the operability of the safety checking means. This same bistable relay means is used as a lockout means in the event of the failure of flame when a flame should exist in the burner, or when a flame is indicated and none should be present.

Abstract: A multiple pilot system is shown for ignition of waste gas from a flare burner, provisions being made to reduce or limit the pilots for ignition at the most effective location as determined by the wind direction and further, if desired by the wind velocity, the reduction in the number of pilots effecting substantial savings of combustible gas. Provision is made for emergency supply of gas to the pilots as desired.

Abstract: A servo valve control system exemplified by way of temperature controlled gas valves. Multiple slave pressure regulating valves are utilized supplying multiple burner manifolds. The first valve of the group of valves is modulated in response to temperature. The outlet pressure of each valve is utilized to bias and thereby modulate the next pressure regulating valve. The first valve, preferably is also controlled in response to an outdoor temperature sensor.

Abstract: The dual-fuel feed system for a gas turbine engine, having a plurality of fuel nozzles arranged to effect admixture of air and fuel in a combustor of the engine for combustion of fuel, comprises a fuel feed conduit means communicating with each of the fuel nozzles and separate sources of different fuels and flow control means for alternating flow of fuel from one source or the other to the fuel nozzles.