May be used in two different ways; as an OPEN only control (all LiftMaster operators) or as an OPEN/CLOSE control (only LiftMaster operators with types B2 and S2 control wiring). In the latter case pulling the cord will open a fully closed door close a fully opened door and reverse a closing door.
Pulling the cord whlie the door is opening will either have no effect (type B2 wiring) or will stop the door (Solid State Logic Control Board).
WARNING: When used on most industrial operators this control will not stop the door. Use another control that has a STOP button in conjunction with this control.
Includes 10 feet of signal hose outdoor air switch and hose plug
OPEN (all operators) when the vehicle passes over treadle hose. The weight of the vehicle on the treadle hose activates a pneumatic switch which sends an open signal to the door. Requires a 2-wire connection to the operator but does not require power to function.