flare nut torque wrenches
can anybody post a link or give some info for some torque wrenches for the flare nuts? lets say I purchase a set can they be used for other units like r22 or would it be over tightened? really its only a matter of tightening enough to seal the pressurized gas and being that 410a is a higher pressure it should work. but my concern is it might be over tightened.
I Have never seen one.....
it was working.... played with it.... now its broke.... whats the going hourly rate for HVAC repair
They have a set in the johnstone catalog.
I'm not going to lie, I've never used a torque wrench. I don't know if the manufacturers teach this in class but I read in some Mitsubishi literature that you can cheat and just get it nice and hand tight then 1/2 turn with wrenches for smaller lines and 3/4 turn on larger lines. That's how I do it.
Crows foot set and torque wrench or get the feel of what tight is
I worked with a guy who over tightened a flare connection on a mitsubishi mini split, brand new install and completely stripped the brass connection on the unit.
I don't think the pressure of the system affects the torque of the fastener. If you get one with SAE and metric wrench ends, you're golden for any and all flare nuts.
Originally Posted by anthonyac1
If you go with the Crow's foot wrenches, remember that you may need to adjust the torque setting depending on the length or angle of the crow's foot adapter to the wrench.
Originally Posted by summerhelp
Over-tightening can crush the tubing at the edge of the flare... thus weakening the tubing.
Under-tightening will result in a leak.
Either way... one risks a leak... which is DEATH for a mini...
Best to use the tools recommended.
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Going an extra 1/2 to 3/4 turn on any flare is too tight, IMO. If your flares have that much slop in them, then you're doing it wrong.
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Don't pick the fly crap out of the pepper.
Hmm I'm trying to think if a actually do an exact amount like a 1/2 turn... I go to the pressure I feel I've been doing with no leaks but I will keep track on my next one and see how far I turn it, I'll just mark one face with a sharpie and see where it ends up. I did read that info somewhere from I believe Mitsubishi when I was trying to decide if I needed torque wrenches.
Originally Posted by Tech Rob
Daikin gives you exact instructions for how far to tighten each size of flare fitting past the point where it starts to get snug, but they very strongly recommend using torque wrenches.
They have a kit available with a fixed torque wrench for each fitting size.
Do you have that info handy?
Originally Posted by mark beiser
I've been looking on mylinkdrive.com but it's only turning up torque.
It is in the installation instructions for each piece of equipment.
Originally Posted by mason
For example, page 9 of the VRVIII-S outdoor unit installation instructions.
I think somewhere in the materials from one of the classes I went to, there is a set of instructions that shows every pipe size in one list, but I'm not sure where to even begin looking for it.
Here's a mini split "kit" with a flare nut torque wrench included.
A little searching will find more like it in both pre-set models and adjustable models.