HH cores/dryers

[dukes13]

How long should an HH core/dryer stay in system after a burnout, I know about checking the oil for acid and all but, I have a new super who knows crap about HVAC, which he denies, and can’t convince him otherwise that they need replacing, 5 weeks long so far.

What are the drawbacks of them in there for a long period time?
:patriot:

[second opinion]

How long should an HH core/dryer stay in system after a burnout, I know about checking the oil for acid and all but, I have a new super who knows crap about HVAC, which he denies, and can’t convince him otherwise that they need replacing, 5 weeks long so far.

What are the drawbacks of them in there for a long period time?
:patriot:

72 hours of run time

[bunny]

After being in a system for 24 hours, a liquid or suction filter-drier has done all it's going to do. If an acid test kit shows the system to still be contaminated, they should be replaced, and the system rechecked the following day. The procedure should be continued until the system is free of contamination.

A suction line filter-drier should be removed after the system contaminants have been removed. It is inherently a higher pressure drop than a suction filter, and its liability is that it might cause unnecessary pressure drop in the suction line. This could lead to oil return problems, and will certainly cause the system to operate less efficiently. For example, on an R-404A system operating at -25F, a 2 psi pressure drop in the suction line will result in an approximate 8% capacity loss.

The drawback of leaving a liquid filter-drier in for a long time would be similar to leaving an air filter in for a long time. At some point it's lost its capacity to remove contaminants. And if it's filtered out a lot of particulate matter, it's subject to excessive pressure drop in the liquid line, causing liquid flashing or simply becoming too restricted to flow at all.

After the contaminated system has been cleaned, replace the liquid filter-drier, and remove the suction filter-drier and replace it with a suction filter.

[ararams]

There is no specific time frame that dictates a filter replacement .All refrigeration operates on pressure and temperature differential ,if there is a pressure or temperature drop across a drier replace it.The amount of pressure drop depends on the system you are working on. I have had to replace a suction filter with 30mins run time that was almost totally clog yet I have OEM units running 15 yrs with these filters.

[second opinion]

There is no specific time frame that dictates a filter replacement .All refrigeration operates on pressure and temperature differential ,if there is a pressure or temperature drop across a drier replace it.The amount of pressure drop depends on the system you are working on. I have had to replace a suction filter with 30mins run time that was almost totally clog yet I have OEM units running 15 yrs with these filters.

What brand of equipment do you use that comes with acid and can run for 15 years?

[ararams]

I"m sorry I was refering to suction filters not hh driers

[second opinion]

I"m sorry I was refering to suction filters not hh driers

Not a problem I just did not want people to think that it was not important to remove an acid core filter during or after a clean up.

[jpsmith1cm]

Replace filters when testing, either acid or pressure drop, indicate that it is required.

On large equipment, we replace them on a schedule and after large repairs.

On smaller systems, typically on repairs or when a problem with the filter arises.

I believe that proactively replacing a filter is just opening the system a second time and risking additional contamination.

Leave well enough alone.

[SBKold]

I believe that proactively replacing a filter is just opening the system a second time and risking additional contamination.

Leave well enough alone.

Hmm this seems to contradict your stance on reusing the refrigerant!

We were talking about reusing 8lbs. My stance was y risk it?

Your stance was you do it often.

[jpsmith1cm]

Hmm this seems to contradict your stance on reusing the refrigerant!

We were talking about reusing 8lbs. My stance was y risk it?

Your stance was you do it often.



Why waste the refrigerant?

It comes out through a drier, goes in through a NEW drier and is recirculated through a third, NEW drier.

What contamination?

I think that WAY too many techs are in the business of selling and not fixing.

[SBKold]

Why waste the refrigerant?

It comes out through a drier, goes in through a NEW drier and is recirculated through a third, NEW drier.

What contamination?

I think that WAY too many techs are in the business of selling and not fixing.

You are crazy to do all that for a residential system.

I am the first to recognize you know your stuff....just seems nuts when virgin is still relatively cheap.

[jpsmith1cm]

You are crazy to do all that for a residential system.

I am the first to recognize you know your stuff....just seems nuts when virgin is still relatively cheap.


Would it be any different if you pumped the system down into a receiver rather than removed the gas into a storage tank?

Why?

Also, what do you do with the gas you've recovered? Where does it go?

Remember, too, that "cheap" is a relative term.

[SBKold]

To me it is different to pump one down.

And recovered goes back to reclaimation facilities to be restored to virgin by machines that are much more than a couple of driers.

I would like to buy a true reclamation machine so I can legally resell refrigerant.

Then I would feel better about reusing it. - Not for legal reasons im aware that its no issue.

[jpsmith1cm]

To me it is different to pump one down.
Why?
And recovered goes back to reclaimation facilities to be restored to virgin by machines that are much more than a couple of driers.

Is there a cost associated with this?
I would like to buy a true reclamation machine so I can legally resell refrigerant.

Then I would feel better about reusing it. - Not for legal reasons im aware that its no issue.


Try it sometime. It really works.

[second opinion]

72 hours of run time

industry standards is a maximum of 72 hours

[jpsmith1cm]

Can I get a second opinion on that?

:LOL:

[second opinion]

Can I get a second opinion on that?

:LOL:

Now that's funny