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?

Question

Accepted Answer

the low-pressure hose fitting at the suction service valve service port

Answer

the low-pressure hose fitting at the gage manifold low-pressure connection

Answer

the high-pressure hose fitting at the discharge service valve service port

Answer

the high-pressure hose fitting at the gage manifold high-pressure connection

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