Ductless A/C With Flared Fittings - HVAC - DIY Chatroom Home Improvement Forum


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > HVAC

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Display Modes
Old 08-21-2010, 10:13 PM   #1
Member
 
Join Date: Dec 2008
Posts: 50
Rewards Points: 25
Default

Ductless A/C with Flared Fittings


Just watched TOH where Richard installed a Mitsubishi ductless A/C. Was surprised to see the installation involved flared fittings on the refrigerant lines. The unit was pressure tested with 300 psi dry nitrogen prior to evacuation. Does anyone know if these flared fittings stay leak-free?

This really looks like a DIY installation. Once you pull a vacuum, you open a valve and the facory precharge is released.

Advertisement

artbuc is offline   Reply With Quote
Old 08-22-2010, 06:00 AM   #2
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 26,526
Rewards Points: 4,690
Default

Ductless A/C with Flared Fittings


Flare fittings have been used on refrigeration units for over 50 years. And stay leak free, if they are made properly.

They were used on standard A/C units for awhile also. Just needed really big flare wrenches though(yes, special wrenches when your talking large lines).

Advertisement

beenthere is online now   Reply With Quote
Old 08-22-2010, 07:07 AM   #3
Member
 
Join Date: Dec 2008
Posts: 50
Rewards Points: 25
Default

Ductless A/C with Flared Fittings


Quote:
Originally Posted by beenthere View Post
Flare fittings have been used on refrigeration units for over 50 years. And stay leak free, if they are made properly.

They were used on standard A/C units for awhile also. Just needed really big flare wrenches though(yes, special wrenches when your talking large lines).
Thanks Beenthere. If you have the proper flaring tool and some basic mechanical skills, could you make a leak-free flared joint the first time?

After I posted this, I found a thread on HVAC-Talk dealing with this subject. Seems like the key is to use oil and make sure you have the right flare angle. Regarding oil, I am surprised that no one expressed concern about oil contaminating the refrigerant. Do you use a special oil, eg compressor oil? Do you put the oil on the flaring tool or inside the copper tube or both? Thanks.
artbuc is offline   Reply With Quote
Old 08-22-2010, 07:21 AM   #4
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 26,526
Rewards Points: 4,690
Default

Ductless A/C with Flared Fittings


Generally use refrigeration oil. The same oil that the compressor uses. POE for R410A.

You put it on the flaring tool. And then on the flare(male end, or the female you just made) when you go to make(put them together) the joint.

Best to make a couple practice flares.
beenthere is online now   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
New House + PEX + Plastic Fittings = ? GaryZ Plumbing 22 01-06-2011 09:47 AM
remove compound from brass fittings to unscrew fittings purpleheart Plumbing 3 05-08-2010 07:49 AM
Barbed fittings into 1-1/2 inch Black Poly MI-Roger Plumbing 3 04-16-2010 07:44 AM
Sharkbite brand PEX fittings at Home Depot rjniles Plumbing 1 03-16-2010 08:33 PM
Tell me all about pex fittings! Red Squirrel Plumbing 10 01-23-2010 06:48 PM




Top of Page | View New Posts