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A multistage space thermostat control system for controlling a refrigeration heat pump and a furnace controls the heat pump from a first stage of a space thermostat and a furnace from a second stage with anticipation circuit means associated with said thermostat control system which is changed in ef

A multistage space thermostat control system for controlling a refrigeration heat pump and a furnace controls the heat pump from a first stage of a space thermostat and a furnace from a second stage with anticipation circuit means associated with said thermostat control system which is changed in effectiveness depending upon the operation to reduce temperature swings in the space.

대표청구항 ▼

An improvement in a control system having a multistage space thermostat for controlling the operation of a refrigeration heat pump and a furnace, furnishing heated air through a common duct to a space, to prevent operation of the heat pump after operation of the furnace until sufficiently low air te

An improvement in a control system having a multistage space thermostat for controlling the operation of a refrigeration heat pump and a furnace, furnishing heated air through a common duct to a space, to prevent operation of the heat pump after operation of the furnace until sufficiently low air temperature from the furnace exists wherein upon a drop in the space temperature below a first predetermined temperature a first stage of said thermostat energizes the heat pump and upon a further drop in space temperature below a second predetermined temperature a second stage of said thermostat energizes the furnace, the thermostat having anticipation circuit means, the improvement comprising, means actuated upon energization of said furnace by said second stage when a make temperature is reached for disconnecting said heat pump from said first stage thermostat, further means actuated by said second stage for energizing said furnace by said first stage until a break temperature is reached whereby said furnace remains energized until said first stage is satisfied, and means for increasing the output of the anticipation circuit means controlled by said first stage to reduce said break temperature of said first stage during the period between when said second stage turns on said furnace and said first stage turns off said furnace to reduce swings in space temperature due to a larger differential in the thermostat operation.