Flame control system for heat exchanger

A method for controlling the operation of a heating system comprising the following steps:

• initiating and terminating a heat demand signal according to the temperature within a region to be heated;
• directing the heat demand signal to a fuel valve;
• actuating said fuel valve upon receipt of said heat demand signal from a thermostatic controller;
• providing a burner with fuel directly from the actuated fuel valve;
• burning the provided fuel at said burner:
• heating a heat exchanger, located proximate said burner, with the burning fuel;
• circulating a heating fluid past said heat exchanger thereby removing heat from said heat exchanger;
• directing said heating fluid from said heat exchanger, through a heat duct distribution network and to the region to be heated;
• monitoring the temperature of said heating fluid in said heat duct distribution network at a position remote from said heat exchanger;
• interrupting said heat demand signal to close said fuel valve when the temperature at said position remote rises above a first temperature:
• and
• permitting said heat demand signal to be reapplied to open said fuel valve when the temperature at said remote position drops below a second temperature.

A flame control system for use with heat exchange systems of the type including a controller for initiating and terminating a heat demand cycle, a burner directly coupled to a fuel valve, said fuel valve being operable in the open position to provide a constant fuel supply to said burner and being operable in the closed position to prevent any fuel supply to said burner, said fuel valve being responsive to a heat demand signal from said controller, a heat exchanger proximate said burner, a fluid circulator arranged and adapted to remove heat from said heat exchanger, and a normally open fluid circulator switch, responsive to the temperature of the heat exchanger and operably coupled to said fluid circulator, adapted to close and activate said circulator when the temperature of said heat exchanger rises above a certain temperature, the control system comprising:

• a normally closed relay switch mounted in series with said controller and operably coupled to a relay coil, said relay coil and relay switch arranged and adapted so energization of said relay coil causes said relay switch to open;
• means, operably coupled to the fluid circulator switch, for energizing the relay coil when said fluid circulator is energized;
• and
• a temperature responsive switch means, adapted to sense said heat exchanger temperature, for permitting the energizing of the relay coil when the temperature of said heat exchanger rises above a first temperature so to prevent the application at said heat demand signal to close said fuel valve, and for preventing the energizing of said relay coil when the temperature at said heat exchanger drops below a second temperature to permit the application of said heat demand signal to open said fuel valve.

A flame control system for use with heat exchange systems of the type including a controller for initiating and terminating a heat demand cycle, a burner directly coupled to a fuel valve, said fuel valve being operable in the open position to provide a constant fuel supply to said burner and being operable in the closed position to prevent any fuel supply to said burner, said fuel valve being responsive to a heat demand signal from said controller, a heat exchanger proximate said burner, a fluid circulator arranged and adapted to remove heat from said heat exchanger, and a normally open fluid circulator switch, responsive to the temperature of said heat exchanger and operably coupled to said fluid circulator, adapted to close and activate said circulator when the temperature of said heat exchanger rises above a certain temperature, said control system comprising:

• a temperature responsive switch means, placed in series with said controller and said fuel valve, for preventing the application of said heat demand signal to close said fuel valve when the temperature of said heat exchanger rises above a first temperature, and for permitting the reapplication of said heat demand signal to open said fuel valve when the temperature of said heat exchanger drops below a second temperature;
• a normally closed third switch placed in parallel across said switch means;
• and
• means for opening said third switch when said fluid circulator switch is closed so that said heat demand signal from said controller to said fuel valve cannot be disrupted until after said fluid circulator has been activated.

A flame control system for use with heat exchange systems of the type including a controller for initiating and terminating a heat demand cycle, a burner directly coupled to a fuel valve, said fuel valve being operable in the open position to provide a constant fuel supply to said burner and being operable in the closed position to prevent any fuel supply to said burner, said fuel valve being responsive to a heat demand signal from said controller, a heat exchanger proximate the burner, a fluid circulator arranged and adapted to remove heat from said heat exchanger, and a normally open fluid circulator switch, responsive to the temperature of said heat exchanger and operably coupled to said fluid circulator, adapted to close and activate said circulator when the temperature of said heat exchanger rises above a certain temperature, the control system comprising:

• a temperature responsive switch means, placed in series with said controller and said fuel valve, for preventing the application of said heat demand signal to close said fuel valve when the temperature of said heat exchanger rises above first temperature, and for permitting the reapplication of said heat demand signal to open said fuel valve when the temperature of said heat exchanger drops below a second temperature:
• and
• an environment responsive switch placed in parallel across said switch means and positioned remote from said heat exchanger, said environment responsive switch arranged and adapted to open sensing actuation of said fluid circulator to permit said switch means to control the cycling on and off of said heat exchanger during a heat demand cycle.