Abstract: There is disclosed a device for telemetry of the temperature of a mass undergoing temperature change, typically of a comestible being heated in an oven, and the like. The device includes a probe having a cavity which receives a thermally expansive material such as wax, a displacement member responsive to pressure developed by the temperature expansive material, a sonic or ultra-sonic signal generator, a latch mechanism inhibiting operation of the audio signal generator and a rod mechanically interconnecting the displacement member with the latch so that expansion of the material in the probe cavity trips the latch mechanism to permit generation of an output signal. The device also includes adjustment means for variation in the relative positions of the latch mechanism to the displaceable member whereby the triggering temperature for the latch mechanism can be fixedly adjusted.

Abstract: A solar heat collector system having a fluid storage unit that is interconnected to the inlet of a solar heat collector by a pump and is also interconnected to the outlet of the collector by a return. A temperature sensor is operatively interconnected to the pump to turn on the pump when the sensor senses a temperature of a first certain magnitude above the temperature of the fluid in the storage unit and to turn off the pump when the sensor senses a temperature below a second certain magnitude above the temperature of the fluid in the storage unit. An aspirator unit is provided for directing fluid from the return to adjacent the senor to change the temperature thereof.

Abstract: In a refrigerant system having a compressor and a pair of coils operatively interconnected to a reversing valve that is adapted to selectively interconnect one of the discharge side and suction side of the compressor to one of the coils while interconnecting the other of the discharge side and the suction side of the compressor to the other of the coils so that one of the coils will act as a condensor and the other coil will act as an evaporator, the improvement wherein the reversing valve has movable ball valve members for affecting the reversing operation thereof under the control of a solenoid operated pilot valve that biases a piston of a piston and cylinder arrangement that is operatively interconnected to the ball valve members.

Abstract: Energization of a motor is controlled by a latching relay operated by switch means passing current from a capacitor to the winding of the relay. The capacitor is charged through a relatively large impedance unipolarity input.

Abstract: A reversing valve construction having a housing provided with four aligned valve seats and a first movable valve member disposed between the two intermediate valve seats. Second and third movable valve members are respectively disposed outboard of the outboard valve seats. A first pneumatically operated movable part is carried by the housing and is operatively associated with the first and second valve members for sequentially moving the same to close one of the two intermediate valve seats and one of the outboard valve seats when the first part is moved in one direction a certain amount. A second pneumatically operated movable part is carried by the housing and is operatively associated with the first and third valve members for sequentially moving the same to close the other of the two intermediate valve seats and the other of the two outboard valve seats when the second part is moved in a direction opposite to the one direction a certain amount.

Abstract: In a multizone air control system employing constant flows of hot and cold air, the hot or cold air is variably mixed with recirculated air to provide zone temperature control.

Abstract: In a refrigerant system having a compressor and a pair of coils operatively interconnected to a reversing valve that is adapted to selectively interconnect one of the discharge side and suction side of the compressor to one of the coils while interconnecting the other of the discharge side and the suction side of the compressor to the other of the coils so that one of the coils will act as a condensor and the other coil will act as an evaporator, the improvement wherein the reversing valve has movable ball valve members for affecting the reversing operation thereof under the control of a solenoid operated pilot valve that biases a piston of a piston and cylinder arrangement that is operatively interconnected to the ball valve members.

Abstract: A self-powered set-back electrical thermostatic device for use in a control circuit of a temperature control system requiring no additional wiring that includes a battery powered, motor driven timing mechanism for changing the ambient temperature setting of a thermostat at selected times.