我想问的是
1.新机抽真空连接真空泵的具体步骤，抽的时候需要把二通阀和三通阀的阀门打开吗？
2.现在是在使用，我想放掉所有冷媒，需要抽真空再定量加吗？放了冷媒的时候真空泵连接好了，二通阀三通阀处于什么状态打开还是关闭？具体的操作步骤
对于我来说这都是疑惑，但是对于经验老道的大神们一定是非常简单的，望各位不吝赐教，本人感激不尽
I am a novice, although it is to do computer appliances, but less air-conditioning contact in the school when the teacher did not teach how to cool, so the air conditioning is not very skilled, fixed frequency air conditioner R22 refrigerant transfer machine also added fluoride state Good, but the inverter R410A only contact, a few days ago to install their own emptying, that is, manually emptying, but the effect is not very good, read a lot of information and listen to you in the forum, the experience of God said the new machine needs to use Vacuum pump vacuum can make air conditioning to play a better effect, the so-called 3 points 7 points to install the quality of the installation did not do a good job of air conditioning is no good
I would like to ask is
1. The new machine vacuum connection vacuum pump specific steps, pumping when the need for two-way valve and three-way valve valve open it?
2. is now in use, I want to let go of all the refrigerant, need to vacuum and then add it? Put the refrigerant when the vacuum pump is connected, two-way valve three-way valve in what state to open or close? Specific steps
For me this is doubts, but for the experience of the gods must be very simple, I hope you have educated us, I am grateful
重新灌氟，二，三通阀打开，抽真空，定量加