Abstract

A condition responsive control device is disclosed for affecting operation of a choke control in response to variable ambient and system temperatures, as well as the use of such a device in a system in which it is desired to adjust an operating parameter of the system in response to such temperatures. The device includes an ambient temperature sensing switch which remains de-energized in response to ambient temperatures below a first preselected temperature level and is energized in response to temperatures in excess of this level so as to transmit an electrical signal in response to energization. The device also includes a system temperature sensing thermostatic coil which remains unactuated in response to system temperatures below a second preselected temperature level and is actuated in response to temperatures above this level so as to effect an operating parameter of the system. A self-regulating heating element is thermally coupled to the system temperature sensing coil and is adapted to generate heat at a substantially constant temperature level in response to electrical energization thereof. The heating element is electrically coupled to the ambient temperature sensing switch and is energized in response to the electrical signal to effect accelerated heating of the system temperature sensing coil to said second preselected temperature level.