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Hi
Regarding ductless mini-split systems
I have a doubt about the 3 way valve on the outdoor unit gas side
Are them all only 2 position (closed/open) with a schrader valve on the service port ?
Or are some of them 3 position, like in the compressor valves in refrigeration system ?
Moises
They are normally only 2 position valves, some have a Schraeder, some do not.
http://i267.photobucket.com/albums/i...2p-Service.jpg
They are not back-seating valves only open/close.
Back-seat Valve ---
http://i267.photobucket.com/albums/i...vice_Valve.jpg
Are you talking about the reversing valve, if you are they are oneway or the other, no in-btween.
magoo
Thank you Brian and Magoo
Brian answered my question
Now I know that the 3 way air conditioning valve
has only 2 positions and the 3 way refrigeration system valve has 3 positions
Most service manuals does not make it clear
This is a great forum with great techs
Moises
Forgot to add that with the 2 position valve when you close the valve the Schraeder is open to the pipework side of the valve.
This is so that you can pressure test/evacuate etc the pipework without the condensing unit.
Thank you Brian
But now there is a doubt left:
When I close the valve the Schraeder is open to the pipework side, as you said.
When I open the valve, does the pipework side gets closed or is the Schraeder valve that closes the pipework side by itself ?
I am asking this because you told some valves do not
have a Schraeder on them.
Moises
No, when you open those valve all you have done is open the port between the two pipes.