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A small bimetal sensing element is located in the air switch that opens on temperature rise to limit the maxi- stream for quick response. These controls have a fixed mum allowable temperature in forced air heating sys- temperature setting and fixed differential. THIS CONTROL MUST BE INSTALLED BY A QUALIFIED INSTALLER. All wiring must conform to local and national electrical codes and ordinances. This control is a precision instrument, and should be handled carefully. Rough handling or distort