Do you have to evacuate your old air conditioner to refluoridate it? How do I do it?

Need, the specific methods are as follows:

Method 1:

Four bells and whistles connected to the inside and outside of the machine screwed tight, first of all, the outside of the high-pressure pipe (small tube) side of the valve with the inner 6 angle open, mounted nut tightening and then the outside of the low-pressure pipe (large tube) towards the downward nut unscrewed, there is a thimble like a bicycle valve core press the air will be discharged, about 10 seconds, the finger a little bit feel cold, stop, mounted nut tightening, then the low-pressure pipe (big pipe) toward the outside, there is like a bicycle valve core thimble press air will be discharged, about 10 seconds, the finger slightly A little feel cold on the stop, put on the nut and tighten it, and then the valve of the low-pressure pipe of the outside unit (big pipe) with the inner 6 angle open, put on the nut and tighten the air will be discharged.

Method 2:

The low-pressure pipe of the outside unit (large pipe) side of the valve with the inner 6 angle open, install the nut to tighten the high-pressure pipe of the outside unit (small pipe) flare first do not tighten too tightly, so that the air from the flare to discharge, the finger a little bit of feeling cold on the stop, install the nut to tighten the air on the discharge. This method should pay attention to the strength of screwing the bell nut.