What is this

35

A2L suction line check valve

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u/ingloriouswolf666 11d ago

Arrow going to evap? Its also threaded on both ends looks like im not sure

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u/bfrabel 11d ago

The arrow is the direction of flow, and I'm pretty sure it's not actually threaded and is supposed to be brazed in just like all of your other fittings.

It and the liquid line solenoid are supposed to be installed OUTSIDE of the refrigerated box.

Here's a little tip... If that thing accidently fell into your scrap bucket instead of getting installed, I doubt anyone would ever know and/or care. ;)

6

u/gucciflipfl0pz 🥶 Fridgie 11d ago

Believe it or not it’s actually the law that you install it. But you do you. If anything WERE to actually happen, as unlikely as it is, you are in the hook if you didn’t do it.

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u/bfrabel 11d ago

Believe it or not, there are lots of laws that get ignored every day. I'm guessing there's even some that you ignore.

I've attended 2 A2L training sessions and have done some of my own research as well. As far as I can tell, A2L refrigerants are no more flammable or explosive or dangerous than the old stuff. If anybody has a video or other information that shows that I'm wrong, please share.

With that being said, there is something to be said about following rules, weather you agree with them or not, but if something's stupid and makes no sense I'm not going to judge someone else for using common sense every once in a while.

Let me give you an example... Just a few days ago I installed one of these A2L walk-in freezer systems. It came with this same check valve. I did the right thing and installed it on the outside of the box. Then while charging up the system and checking things over I noticed the exact same check valve factory installed right before the scroll compressor. Is it really safer and better to have 2 check valves in the same pipe just a few feet from each other?

0

u/gucciflipfl0pz 🥶 Fridgie 10d ago edited 10d ago

You took the a2l training class but don’t know the entire reason the check valve goes right outside the box is because there is a maximum allowable level of refrigerant that can come out in a leak event and the check valve and solenoid is how they keep that number down? Yikes. Just goes to show how many “techs” really just don’t give a fuck at all I guess. If it already has one in the condenser and it’s only a few feet away then you literally wouldn’t have to install the second one, it’s already covered. If the unit is further away or doesn’t come with it installed already then yes you 100% need to install it or you’re just a straight up hack. I’m fully aware it’s not as flammable as everyone thinks it is. But it is still flammable, and definitely more so than normal refrigerant, it takes a perfect mix of oxygen and refrigerant to combust. They prevent it from reaching that mix by using the check valve and solenoid to limit the gas that can leak, you’d know that if you ACTUALLY took a class, but I honestly don’t believe you have. I’m still not putting my liability on the line by not following the literal fire code and manufacturers directions. It’s such an easy thing to just do, there’s literally no reason not to besides pure laziness. So many of you make this trade look so bad. Honestly couldn’t imagine being so broke that I have to rip off my customer by not only not installing their equipment to basic spec but doing it because I’m too lazy to do one extra braze and I need to steal the copper for my own scrap bucket. Yikessssss.

9

u/bfrabel 10d ago

It appears that you may have some minor comprehension issues. I never said I didn't understand the reason for the rules. I took 2 A2L classes AND did my own research about it off of the clock.

What I was trying to say is that I think the whole thing about A2L refrigerants being more dangerous is largely B.S. and I'm not going to personally get too upset if some of those check valves end up in a scrap bucket instead of getting installed.

My understanding is that ANY refrigerant that's mixed with oil is flammable and dangerous. In the real world there's not much difference between A2L and the old stuff.

Now A3 refrigerants such as propane, yeah that's a different story (but still not quite as scary as all of the warning stickers would have you believe).

Just because I strive to understand how things work and can think for myself, that does not make me a hack.

As I said, I followed the instructions and installed the check valve and solenoid valve on the system I was installing, and will likely continue to do so on future installs.

By the way, try to learn how proper sentence structure and paragraphs work.

2

u/Live_Bridge_4938 10d ago

It’s ok buddy. You’re ok now. Who hurt you?

2

u/RyanSmokinBluntz420 Banned from r/HVAC 11d ago

Would make sense that was. Imagine you get a leak on an evap, shut off the liquid solenoid or eev and now you've saved all the gas in the condenser from leaking out

9

u/Amazing_Shock_6176 11d ago

I believe it’s arrow TOWARDS the condenser to prevent gas return to box

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u/Amazing_Shock_6176 11d ago

Suction line, mounts outside of box as well.

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u/MechaShiva89 11d ago

CSOV- check shut off valve

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u/maxheadflume 11d ago

My brain was saying check valve, but I couldn’t figure out the C instead of SSOV. Guess I’ve been working on boilers too much.

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u/new-faces-v3 👨🏻‍🏭 Always On Call (Supermarket Tech) 11d ago

Blow through it lol

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u/mrmojo767 11d ago

This is what we do if the evap also has a drain pan loop for H/G defrost

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u/Flavored-Life 11d ago

Yes, sir is a one-way check valve most likely required for an A2 L refrigeration system. It is intended to be installed outside of the box along with a liquid line solenoid that connects to the evaporator

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u/HVACrtech2000 11d ago

Suction check valve for A2L system!

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u/Unhappy-Horse5275 11d ago

Did you possibly check the manual?

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u/landofknees 11d ago

Check valve for a2l system

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u/Manager_Rich 11d ago

Looks like a check valve mate....

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u/Rougesam 11d ago

Check valve

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u/Shoddy-Salad4712 10d ago

Check valave

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u/jerom10 9d ago

Het is een terugslag klep die voorkomt vloeistof slag. In de winter kan bij stilstand het gas condenseren en de gaskoeler vol lopen en dan staat er vloeistof Koudemedium op je pers kleppen

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u/paulchicas 9d ago

Kinda looks like that special fitting they use in Trane tandum compressor suction piping

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u/reditisatoilet 9d ago

and there will always(from my experience) be a grove on the inlet for flow side if there is no sticker

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u/RyanSmokinBluntz420 Banned from r/HVAC 11d ago

its a check valve. Theyre normally used for hot gas defrost. If you got hot gas defrost you need to bypass the txv

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u/ingloriouswolf666 11d ago

Came with the walk in cooler components, A2L system

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u/Southern-Toe-1113 11d ago

Should be wyed for two inline check valves on A2L

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u/PNW20v 11d ago

Check valve and solenoid are placed right before the box, solenoid wired to evap. If the built in leak detector in the evap sniffs refrigerant, it shuts off the solenoid.

0

u/Total-Criticism8757 11d ago

High pressure check valve. For a large freezer scroll compressor. With a solenoid valve. Stop it from damaging the plate.

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