When purging a refrigeration gauge manifold using system pressure as the source of refrigerant for purging, which of the fittings listed is normally tightened LAST?
• Direction of refrigerant flow through the manifold during purging • Purpose of leaving one connection slightly loose to expel air and non‑condensables • Difference between high-pressure side (discharge) and low-pressure side (suction) connections on a manifold set
• Visualize the purging sequence step-by-step: which side of the manifold is supplying pressure, and which path does the refrigerant take as it pushes air out? • Ask yourself: to effectively purge air from the hoses and manifold, which fitting must remain loose briefly so the air can escape before refrigerant vapor flows steadily? • Consider safety and control: is it safer to crack open a fitting at the manifold or at the compressor service valves when purging with system pressure?
• Identify which port on the manifold is connected to the high-pressure side of the system during purging • Confirm which hose/fitting location allows controlled venting of trapped air away from the compressor and system components • Verify that the fitting you choose to tighten last is at a point where air will exit before refrigerant re-enters the sealed system
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