Evacuating refrigerant lines

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Old 07-21-19, 07:49 AM
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Evacuating refrigerant lines

So, I have installed a mini split system and everting is a go until I reached the step of evacuating the refrigerant lines. The hose from the manifold to the service inlet does not connect. I watched a couple of youtube videos and it looks like they uses a small coupling of some type. I have no idea where to find one or what size it would be.
 
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07-21-19, 11:09 AM
roughneck77
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It’s 5/16” X 1/4”.
Make certain you do a proper nitrogen pressure test, and use a micron gauge while evacuating.
 
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Old 07-21-19, 08:38 AM
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You need an adapter. Most local supply houses in your area should have them.

https://www.supplyhouse.com/Yellow-J...1-4-Male-flare
 
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Old 07-21-19, 08:45 AM
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That looks like the one! I'll update my post if that works.
 
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Old 07-21-19, 11:09 AM
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It’s 5/16” X 1/4”.
Make certain you do a proper nitrogen pressure test, and use a micron gauge while evacuating.
 
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Old 07-21-19, 09:42 PM
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Welcome to the forums.

Just keep in mind that the information already offered is about all that we can give you as
charging a home A/C system requires an EPA issued refrigerant handling license and based on
that...... discussions are not allowed in the open forums.

doityourself.com/forum/air-conditioning-cooling-systems/charging-your-A/C
 
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Old 08-06-19, 08:12 PM
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As advised by 57TinkerMan and Roughneck77, it was exactly that. There is a 5/16 x 1/4 fitting required to connect the hoses properly in order to pull a vacuum in the refrigerant lines. The only thing being evacuated is air. The refrigerant is never physically handled as it is self contained within the unit in a sealed system.

Thanks to both for your help!
 
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