peircing valve

[SixInOne]

I am currently in school and I wanted to practice on my window ac some simple ac tests..I want to install peircing valves because the system does not have any valves..my question is what kind or size should I install I understand how it works I just can't size it correctly so if anyone could help me with that I appriciate it

[mo-flo]

been awhile since i worked on window units,but you will need the to size it to the line size you are tapping into,.....if i remember correct the valves come for like 2 sizes lines and there are a couple different valves to cover different size of lines.......just remember that a window unit is a sealed system and once you tap it,you now have the potential for leak to occur at that fitting.....sorry,couldn't be of more help.

[SixInOne]

Ok I appriciate your help and there is noway to install valves without removing the refrigernt from the system is there? That maybe a stupid question lol but I am new in this field I like how it works

[lentz]

Be real careful. After you install the peircing valve you are going to loose some freon when you put on the hoses to check the charge. Just check the size of the suction line going into the compressor. Then get the right size peircing valve. A number of sizes are made.
Check what freon is in the unit before you put on the gauges.
Don't mess up. Have your gloves and safety glasses on. That freon can burn you.

[BKLYNBORN]

Yea becarefull use short hoses due the small charge in the unit .Are you in tech school

[cehs]

I would get ONE piercing valve, install it on the charging stem of the compressor, reclaim ALL the refrigerant, then braze a valved stem on the charging stem of the comp.
Finally I would braze a valved T in the liquid line and you can do what ever you want with that system with your guages.

Chris

[hvac Denny]

when you get done using the charging stem, make sure you don't leave it like that!

It will leak!!!