F - Mech Eng,Light,Heat,Weapons – 24 – D
Patent
F - Mech Eng,Light,Heat,Weapons
24
D
237/21
F24D 5/00 (2006.01)
Patent
CA 1181379
Abstract of the Disclosure A forced-air heating system with individual room or zone control of the temperature has an air distribution system that carries a forced flow of warm air from a furnace to outlets in each room. Thermostats in each room are part of a control system and generate first and second control signals when the room temperature is below or above, respectively, a preselected value or values. The first control signal opens the associated outlet and the second signal closes it. The control system includes a central control device that fires and shuts down the furnace in response to the first and second signals from the room thermostats. When at least a preselected number of rooms call for heat, the furnace starts. When less than a preselected number of rooms signal that the associated outlet is open, the furnace shuts down. In the preferred form, the system modulates the air flow in response to the number of rooms calling for heat. The furnace is preferably an isothermal unit such as a heat pipe furnace or a miniature boiler that operates in conjunction with a fan-coil heat exchanger. In either case, the furnace is preferably heated by a power burner with a variable firing rate responsive to the temperature of the circulating air at the furnace outlet. In a modified form useful with existing conventional fixed rate forced air systems, certain outlets are permanently open and thermostatically controlled room outlets operating according to this inven- tion provide a secondary heating system for selected rooms.
397220
Hurley James R.
Searight Edward F.
Smart & Biggar
Thermo Electron Corporation
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