Door closer assembly

A door closer hold open assembly connectable to a door for closing the door in response to a control signal comprising,

• a housing, a linkage assembly connectable to the door to transmit door movement from a closed position to an open position, biasing means providing a restoring force to move the door to the closed position, a main piston assembly disposed in said housing and actuatable by said linkage assembly to move said main piston assembly against the force of said biasing means as the door moves from said closed position, a fluid chamber disposed in said housing and having fluid disposed therein for exerting a force on said main piston to balance the force of said biasing means in any desired door position to maintain said main piston in the position it was last moved to by said linkage assembly, and release means for releasing the fluid disposed in said chamber to dissipate the balancing force of said fluid to allow the door to return to the closed position, said release means including first and second valve means disposed in a parallel circuit each of which is independently operable to control the flow of fluid from said chamber, said first valve means being electrically controlled from a closed position prohibiting flow therethrough from said chamber to an open position providing flow therethrough from said chamber, said second valve means being resiliently biased toward a closed position prohibiting fluid flow therethrough from said chamber and being operable upon a predetermined increase in the fluid pressure in said chamber to open against said resilient biasing force and provide for fluid flow therethrough from said chamber.