TXV hot swap
The company I work for pushes us to do hot swaps on 410 TXV's. I'm not a big fan of doing it this way. I'd like to get others' thoughts/pros/cons on doing this.
What do you mean by 'hot swap'
Originally Posted by jpsmith1cm
It`s better to be silent and thought the fool; than speak and remove all doubt.
Twilly says they steal it from one house and install it in another and get paid for it.
No Heat No Cool You need Action Fast
Hot Swap is when we pump down the system into the condensor and leave some pressure in it so we are venting some of the 410A
They tell us that it is faster this way and we dont have to test with nitrogen or pull it down in a vacuum.
I've done things this way and can say from experience that it is t a good method.
Originally Posted by Lawrence a
Do I right.
If the txv is equiped with mechanical conections , such as chatleff with seals , then there is nothing wrong at all with changing the valve with say , 5 psi on the lines and evap.
This saves time , avoids contamination , and is perfectly do-able.
New drier or evacuation not needed.
Even with zero pounds , Carrier says vapor will still exit for some time , preventing air and moisture from entering. (you can see the fumes)
Also , you can easily thumb a hole with five pounds.
I was taught that moisture can enter a system even with pressure on the system because moisture always runs from wet to dry. I think the term was vapor pressure can push moisture into a system through a leak even though the system never loses the total charge. I will admit to quickly changing a txv a time or two the way mentioned without any ill effects that I know of.
Last time I checked 99% of us get paid by the hr. I recommend residential, commercial no matter what application pump it down, change the txv, change the drier and vac the system. This leaves little room for error. That's my personal opinion.
Are you saying moisture can travel from atmospheric pressure to a closed pressurized system through a leak???????? How is this possible???????
Originally Posted by BobbyBJr
I've done hot swaps on large supermarket systems where pulling a 500 micron vacuum before all the food melts would be impossible and its worked fine.
Ive hot swapped TXV thermal elements on commercial and residential systems many times with no trouble.
I've never hot swapped a valve on a small split system though. The only ones I've changed required brazing and you can't do that on the fly.
I've never seen a 410a expansion valve fail yet, knock on wood.
What part of doing this worries you?
Then we can answer that problem.
Common sense isn't very common anymore.
This thread contains DIY info. It should not be in an open forum.
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RSES CMS, HVAC Electrical Specialist
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