Siemens RWF50.20A9 control box

Siemens RWF50.20A9 controller is primarily used for temperature and pressure control in heating plants operating on liquid fuel or gas. An external switch can be used to switch the controller to two-stage mode for controlling two-stage burners. The direction of the controller's control action can be reversed for operation with cooling systems. The built-in thermostatic function turns the burner on and off. It is used as a three-position compact step controller without output feedback.