Vaccum problem's

[AVR2018]

This is going to sound stupid been doing this almost 30 yrs went and changed a compressor.
pressurized up to 155 pounds checked for leaks sprayed each joint. Did not lose pressure
installed core tools did hi side and low side. removed core tools thinking they were leaking but i guess not still the same thing And yes I broke with nitrogen
put on vacuum for just over an hour small system got down to 325 microns.
but it would not hold a vacuum new hoses Fieldpeice mr45.
The system still had a full charge upon recovery.
Any idea's
Thanks

[slctech]

Vacuuming through your gauges?

[JayMan7]

Redock your hoses to your manifold with the crt attached and vacuum the entire rig? Does it hold?

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[AVR2018]

Vacuuming through your gauges?

First time yes 2nd time no still the same thing using all fieldpiece two different manifold's

[SP!TF!RE]

In my experience you are not going to vacuum down to 325 microns if you have any sort of a leak, there has must be something with in the system still effecting the vacuum? If equipment is proven accurate. Then it may be the system. What does the vacuum rise to?

[Restaurant Mech]

Possible moisture in system? Have you tried the old triple evac to see if it'll hold the microns?
Other suggestion is nylog on fittings and not using manifold

[heatingman]

Schrader without a cap? Like a unused port on evap?


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[jconaway53]

Out of curiosity, did you end up losing the whole vacuum? Or did it break a certain point where you called it? I agree with a couple other comments about the possibility of there bein moisture in the system. The other possibility is there being a leak within whatever you are using as a micron gauge. I don't pull through manifolds anymore due to me having to waste time looking for a leak that was never actually there, and it being my hoses. Or the possibility of the micron gauge being dirty inside the manifolds.

[Deathpunch0311]

If you pulled to 325microns you don’t have any leaks.

When was the last time you changed your pump oil? Is your micron gauge clean?

[BBeerme]

What did the microns rise up to and how long did it take to get there?

This is going to sound stupid been doing this almost 30 yrs went and changed a compressor.
pressurized up to 155 pounds checked for leaks sprayed each joint. Did not lose pressure
installed core tools did hi side and low side. removed core tools thinking they were leaking but i guess not still the same thing And yes I broke with nitrogen
put on vacuum for just over an hour small system got down to 325 microns.
but it would not hold a vacuum new hoses Fieldpeice mr45.
The system still had a full charge upon recovery.
Any idea's
Thanks

[YOUNG FROSTY]

RIP OP

[Deathpunch0311]

RIP OP

??

[2sac]

If you pulled to 325microns you don’t have any leaks.

When was the last time you changed your pump oil? Is your micron gauge clean?

and if you have a 2 stage pump and all you're doing is draining the oil, you're only removing 2/3 of the oil.

[Hurst11]

I’m gonna say oil in the evaporator or condenser and as it’s in vacuum a small amount of refrigerant bubbles out and it’s reflected in your micron reading. It’s hard to pull and keep an extremely deep vacuum on an existing system.