In a refrigeration system, once the gage manifold hoses are attached to the compressor service valve connections and properly purged, what should be the status of the manifold valves and the service valves when the purpose for attachment is to read system pressures?
ā¢ Manifold gauge set functions ā what changes when manifold hand valves are open vs closed? ā¢ Compressor service valve positions ā what does back-seated, front-seated, and cracked-off/backed-off mean for flow and gauge port access? ā¢ Reading pressures vs charging/pumping down ā which operation requires flow through the manifold center hose and which does not?
ā¢ When you only want to READ system pressures, do you need refrigerant to flow through the center (charging) hose of the manifold, or just from the system into each gauge? ā¢ On a typical service valve, in which stem position is the gauge port actually connected to the system so the gauge can sense pressure, and in which position is it isolated? ā¢ Which combination of valve positions lets you see system pressure while minimizing the chance of accidentally adding or removing refrigerant from the system?
ā¢ Verify what happens to the center hose when the manifold hand valves are open versus closed. ā¢ Confirm which service valve position (back-seated, front-seated, or cracked-off/backed-off) exposes the gauge port to system pressure. ā¢ Check that your chosen setup allows pressure measurement only, with no intentional path for refrigerant transfer.
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