The Armstrong Posi-Pressure Controller explains the reasons for and benefits of the Armstrong-designed steam coil drainage system and describes its installation and operation. This video uses a combination of animation, footage from working installations and demonstration systems constructed with glass piping. You will observe operation of face-and-bypass systems, integral face-and-bypass systems, modulated pressure systems and the Posi-Pressure System as they go through a typical heating day. As a result, you will become aware of conditions inside various systems. Whether you are installing a new system or trying to solve a specific problem within an existing system, this video can help you decide which solution is best for your application.