Closure of l20 vac relay (l) opens 24 volt damper motor circuit (termini l and 2), allowing spring to reverse damper to open ... position, sliding switch closes completing circuit to 24 volt relay via terminals 2 and 3 and N.O. contact of 120 relay. 4.
|Title||:||Safety investigation of gas appliance energy saving devices and automatic vent dampers for oil furnaces|
|Author||:||D. E. Adams, W. A. Bullerdiek, Calspan Corporation, U.S. Consumer Product Safety Commission|