Automatic air flow control

Claim 1

A solar heating system comprising a collector having an inlet end and an outlet end, a heat storage unit having an inlet end and an outlet end, a space to be heated, air ducts interconnecting in series in a closed system said collector and storage unit and air ducts connecting parts of said system to said space, a fan operatively associated with said first named ducts downstream of the collector, a plurality of dampers in series in said system each adjustable to alternative positions for establishing a desired air flow circuit, and an electrical operating circuit for controlling automatically the adjustment of the dampers and operation of the fan, a first damper being located between the outlet end of the collector and inlet end of the storage unit and being adjustable to connect the outlet end of the collector alternatively to the inlet end of the storage unit or to the space to be heated, a second damper being located between the outlet end of the storage unit and inlet end of the collector and being adjustable to connect the inlet end of the collector alternatively to the storage unit or to the space to be heated, third and fourth dampers being located at opposite ends of the storage unit and adjustable to connect both ends of the storage unit with the space to be heated, the electrical circuit including thermostats in the collector, storage unit and space to be heated, and said electrical circuit being adapted to actuate dampers and the fan to cause warm air to be supplied to said space on demand of the thermostat therein when either other thermostat indicates that warm air is available from the collector or from the storage unit.