White-Rodgers" Fan and Limit Control, Universal, Series: 5D51, Close On Rise, SPDT, 50 to 365 deg F, Inductive: 14 A, 5 in Element, 15 to 25 deg F Differential, Standard, Plenum Mount, 2.9 in W x 1.6 in D x 4.3 in H, Import
This fan and limit control combines, in one enclosure, a fan switch with an adjustable differential which operates the blower in a forced warm air furnace and a limit switch with a fixed differential which automatically shuts off the burner if the furnace temperature exceeds a predetermined high point. A summer fan switch is incorporated in this control to provide a convenient method for manual operation of the fan for air circulation during the summer.