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Exhausting Nitrogen
Context
Before welding refrigerant pipes, fully
exhaust nitrogen from the refrigerant pipes to avoid explosion and
injuries.
Procedure
- Remove the bonnet of the low-pressure needle valve shown in Figure 3-30 and connect the pressure gauge leather hose to the needle valve.
- Open the pressure gauge valve. Loud noises of air flow are generated at first and then disappear gradually.
- After the air is exhausted, remove the pressure gauge and install the valve bonnet.
- Continue exhausting nitrogen from the exhaust pipe needle valve and liquid pipe needle valve by performing 1–3.
