Nitrogen leak test walk in freezer

[harrisal21]

I'm new to refrigeration and trying to learn as much as I can. One question I have is when it comes to nitrogen leak testing a walk in freezer. During this process does the liquid line solenoid need to be manually opened?

[WT70]

I'm new to refrigeration and trying to learn as much as I can. One question I have is when it comes to nitrogen leak testing a walk in freezer. During this process does the liquid line solenoid need to be manually opened?

Yes, either by a manual stem or solenoid magnet.

Same goes for evacuation.


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[VTP99]

That would depend on your points of access.

[WT70]

That would depend on your points of access.

As I just had an argument with a guy that tried a shortcut... the OP only asked if it should be manually opened. I’d say yes, every time.

That way he always thinks about it.

If he has a port on the other side of the solenoid he can use and decides not to manually open the solenoid, that is his choice.

But as he is learning, and only asked if it should be opened. Then yes.


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[Red Man]

I will typically leave it open for purging, pressure testing, and evacuation. It does not need to be open for pressure testing or evacuation if you use the suction and liquid service ports at the condensing unit.

[VTP99]

Well technically he could apply electric to it which wouldn't really be manual in the sense of the word.
The solinoid could also be located at different locations.
But I agree a novice should make certain it's not creating a restriction obstructing flow if needing to pass through it.

[indy2000]

if you dump N2 into the high side while looking at low side pressure, you can prove the solenoid holds and so does the dis valves in the compressor

then you once you are good there, you can dump into the low side, with a magnet or like

[pecmsg]

Pull a control wire to disable the compressor. Energize the solenoid.

[pecmsg]

I'm new to refrigeration and trying to learn as much as I can. One question I have is when it comes to nitrogen leak testing a walk in freezer. During this process does the liquid line solenoid need to be manually opened?

You've got the post count

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[rkious]

Watch out for the test pressure on Heatcraft products that have transducers. You can either keep it under the safe pressure or unscrew it. They show funky pressures after being hit with to high of a nitrogen test. Don’t ask me how I know

[Snapperhead]

You can also create leaks on semi hemis ....

[indy2000]

Watch out for the test pressure on Heatcraft products that have transducers. You can either keep it under the safe pressure or unscrew it. They show funky pressures after being hit with to high of a nitrogen test. Don’t ask me how I know

evap data plate should have the design pressure clearly stated

if the xducer cannot handle it, that is a mauf issue

i am not familiar with what they are using, i have used many pt-x from emerson, without issues

[WT70]

if the xducer cannot handle it, that is a mauf issue

Got to take em off for vacuum anyway, so why not be safe and take them off while nitro testing?

And it depends on what range the suction transducer is good for. If it’s a 0-100 transducer, hitting it with 200psig of nitrogen might mess it up.

But again. Transducers are not built (as a general rule) for deep vacuum. So remove them if doing any pressure testing/vacuums. Then you don’t have to worry if it will hold the nitrogen or not.


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[BALloyd]

They should all be on isolation valves on a proper install anyway.

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[indy2000]

Got to take em off for vacuum anyway, so why not be safe and take them off while nitro testing?

And it depends on what range the suction transducer is good for. If it’s a 0-100 transducer, hitting it with 200psig of nitrogen might mess it up.

But again. Transducers are not built (as a general rule) for deep vacuum. So remove them if doing any pressure testing/vacuums. Then you don’t have to worry if it will hold the nitrogen or not.


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I have not heard that anywhere, talking with engineers at emerson or alike............


here is a little spec sheet

https://climate.emerson.com/document...us-1734302.pdf


I always leave them on for pressure testing and evacuation, if they dont pass that, back they go to the supplier....

I dont know, maybe a close to a 1000 of them, i have done..........

[pecmsg]

Just looked at a LP transducer.
Rating 0 - 18 BAR
Converted 0 -261 PSI
Don’t see an issue!

[Chill_Pill]

Not necessary if you're lazy and you have a scent about the leaking part I.E hole in the condenser coil.

[indy2000]

Just looked at a LP transducer.
Rating 0 - 18 BAR
Converted 0 -261 PSI
Don’t see an issue!

i think that is operating signal

design pressures, i like burst, are way higher

[pecmsg]

Exactly!