Siemens RWF50.21A9 control box

Siemens RWF50.21A9 controller is primarily used for temperature and pressure regulation in heating plants operating on liquid fuel or gas. It is used as a three-position compact step controller without output feedback. An external switch can be used to switch the controller to two-stage mode for controlling two-stage burners. The built-in thermostatic function turns the burner on and off. The direction of the controller's control action can be reversed for operation with cooling systems.