Hello everyone. I am an hvac student. I have a question I hope someone can answer.
Say you pull a vacuum on a residential ac system. You have achieved the vacuum level you want and it held. Now, you want to charge the system. ( this is how I understand the procedure from this point on ) You close the hand valves on the manifold and remove the vacuum hose. Two, you connect the charging hose on the refrigerant cylinder and then you connect it to the manifold. now here is my question. How do you get rid of the air that is in the charging hose and the air that went into the manifold middle port?