🔍 Key Concepts

• Pneumatic control valve (PV) symbol and how its sensing lines are drawn in the diagram • Where the converter and its associated manifolds/lines (supply, return, pump discharge) are located in the GS-0151 illustration • How a bypass valve for a hot-water converter uses a high-pressure and low-pressure signal to position the valve

💭 Think About

• On the GS-0151 diagram, follow the small line(s) connected to the pneumatic control valve near the converter. To which labeled piping or manifold does the line that is not going to the controller/thermostat actually connect? • Think about which part of the hot-water system would provide a relatively stable reference pressure for the valve: is it more likely to be taken from a supply header under pump pressure, a return manifold at lower pressure, or directly from the converter body? • Compare each choice (manifold, converter, pump discharge, supply line) with the actual labels and arrows on the drawing. Which label appears exactly where the sensing line terminates?

✅ Before You Answer

• Verify the PV symbol on GS-0151 and confirm which nearby text identifies its connection point. • Confirm that the point you choose is clearly labeled on the illustration using the same wording (or very close) as one of the answer choices. • Make sure you are looking at the pneumatic bypass valve for the converter, not the valves serving the separate heater or convector shown elsewhere on the diagram.