F - Mech Eng,Light,Heat,Weapons – 23 – N
Patent
F - Mech Eng,Light,Heat,Weapons
23
N
341/21
F23N 5/02 (2006.01) F23N 5/24 (2006.01) F24D 19/10 (2006.01)
Patent
CA 1169137
ABSTRACT OF THE DISCLOSURE A control circuit for a heating system having a gas burner assembly, a heat absorbing coil, a heat releasing coil, a circulating pump for pumping a hydronic fluid between the two coils, and an air blower for the heat releasing coil is disclosed. The control circuit includes a thermostat located in the space to be heated and a first relay switch which electrically connects the circulating pump in response to a signal from the thermostat. A combustion safety control is electrically connected to the thermostat, a main gas valve, and a flame sensor such that the main gas valve is open in response to a signal from the thermostat and the main gas valve is closed where no signal is receive- ed from the thermostat or an insufficient signal is received from the flame sensor, A second relay switch is electrically connected to the air blower, the circulating pump, and a hydronic fluid temperature sensor such that in response to a signal from the fluid temperature sensor the air blower and the circulating pump are electrically connected. After the thermostat ceases to send a signal to the first relay switch, the second relay switch acts to elec- trically connect the air blower and the circulating pump so long as the temperature of the fluid is sufficient to provide heat to the space to be heated, A number of safety features are also provided.
397278
Richardson William M.
Smart & Biggar
LandOfFree
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