Factory installed LL dryer

hvaclover

Heil started shipping driers about five years ago in all it's units above it entry level model.

All the 410A units are sue as shootin' coming with driers now.

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Not Stupid, Just slow

beenthere

If they just sent a drier with for the techs to install. Too many driers would end up sitting as stock on the service trucks.

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RoBoTeq

Or worse, tossed in the trash pile because they already have too many of them. This is what happened that caused the compressor manufacturer's to require equipment manufacturer's have filter/driers installed in the outdoor units in order to get the measly 20 month warranty that compressor manufacturer's give for compressors.

beenthere

Not bad, for a product, they have little to no control over how its used.

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John Markl

Why put them in with the unit they came with, when you can sell them out of your flat-rate book later?

hvaclover

Any tech who does that would get canned. Time used to be bad refer techs would get demoted to the ranks of resi hvac but at least these former refer tards still used a filter drier on ac installs no matter how bad their skill set in refer service used to be.

Now, years later, the trade crosses lines that once firmly seperated one another and we got a whole generation of low caste techs and mediocre indendant operators with no accountability.

It makes work for the compatent techs and independants, but at the cost the cost of bursing an already tattered industry reputation.

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beenthere

Unfortunately. Thats done/was done by more then one company.

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nicktech

tempstar sends all their condensers with a field installable sweat LLD. there great. they recommend them to be installed closest to the evap.

RoBoTeq

Still? What brand of compressor is in them? What are the compressor warranties?

nicktech

tempstar carries a copeland compressor with 10 yr warranty

hvaclover

seems the standard right now.

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RoBoTeq

Not without an internally installed OEM filter/drier.

hvaclover

I call your attention to Nordynes' ten year comp warranty. No requirement for an LLD on their R22 system.

Can't speak for their 410A systems but I am sure they probably do.

Even Lennox owned Aire Flo brand 410A system come with an LLD.

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carmon

why would you put a liquid line drier near the evaporator coil,I have been in this trade for 30 years and have never on a/c work or refrigeration work put the drier near the evaporator,it just makes no sense to me. the manufactures must have a reason for it i suppose.

beenthere

Because they can hold more moisture when they are in a cooler ambient temp. Then they can when they are in a hot ambient area.

At the evap coil. Doesn't apply to units with the evap coil installed in a non conditioned attic.

A LLFD can release moisture back into the system when it gets hot. If it is holding near its rated capacity at 75°F. At 95°F, it would have more moisture then it can hold/retain. And will release it back into the system.

Same reason that you should cut out the old filter drier, instead of unbrazing it.

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carmon

I can see that but how much moisture are in these driers, If you size the drier correcrtly it will never fill with moisture,I have never had any trouble with driers releasing moisture,i imagine it happens ,i guess I Have just got lucky

beenthere

If you have to ask how much moisture is in these driers. Then how can you size one correctly?

Not meant to be insulting, or offensive toward you in any way.

A filter drier rated to hold 400 drops of moisture. Can hold 20 grams. Its takes 28.35 grams to equal 1 ounce. So the above filter could hold .7 ounce(taking weight, not volume).

There are 16 ounces to the pound. A gallon of water weighs 8.33 pounds at 50°F. So that filter drier can only hold .0052 gallon of water/moisture.

The next factor that varies a filter driers ability to hold moisture. Is the refrigerants ability to absorb moisture(the moisture solubility of the refrigerant). As the refrigerant warms up, its solubility increases, and it will pull moisute from the filter.

Lucky, maybe, maybe not.

You may have seen the effects more often then you think, or know of.

That unexplained sticking/stuck piston at the evap. That clogged cap tube on heil/ICP heat pumps(and some other brands).
The clogged filter drier. Sticking rods in a TXV. A shorted compressor(even though there is no acid). the system with non condensables(some of that non condenseable is water vapor,).

There's more.

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carmon

no problem I did not take it as insulting. I have never in my life many plug with contaminents ,if there is that much moisture present i will change out the drier more than once to take care of of it. I know now adays its getting worse with the new oils absorbing moisture,I just always install the drier at the condensing unit a/c or refrigeration

hvaclover

That applied to driers that had ABSORBENT desiccant. Driers using ADSORBER types of desiccant will not give up moisture.

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beenthere

Post a link to the specs that say that.

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