When charging refrigerant into the system as...

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Question 1 of 205eccef9dbacbc34ba4d460a7

When charging refrigerant into the system as a vapor with the compressor running using the service gauge manifold set illustrated in figure "C" of the illustration, what is the correct position of each of the hand valves? See illustration GS-RA-30.

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🔍 Key Concepts

• Flow path of refrigerant when charging as vapor with compressor running • Function of low-side (blue), high-side (red), and center/service (REF) hand valves on a manifold set • Why you normally charge vapor only into the low side of an operating system

💭 Think About

• Trace the path the refrigerant must take from the cylinder, through the REF/service port, to the system while the compressor is pulling on the low side. Which valves must be open to allow that path? • Which valve position will prevent refrigerant from entering the high side of the system directly from the cylinder while still allowing pressure readings on both gauges? • Look at where valve 27 connects. During normal charging (not evacuating), should the passage to that connection be open or closed?

✅ Before You Answer

• Confirm which numbered valve is the low‑side hand valve and which is the high‑side hand valve in figure C. • Identify which numbered valve controls flow from the REF (charging) port into the manifold body. • Ensure that your choice has refrigerant able to flow from the cylinder to the low side only, with the path to the vacuum pump / extra port kept closed.

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