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I just started up a brand new RTAC. Looked up parts off of serial number and it comes back with the same part number for the canister with the paper element in it that the RTAC has always used. I didn't open up the canister and look, just looked up the part number.....

POE oil will absorb moisture through a plastic bottle or jug. That's why the oil is in a steel container when purchased new to prevent the oil from absorbing moisture while on the shelf.

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Originally Posted by FixItRight

... it was a drier not just a drier core.....

what does this mean?

I asked him if he meant that and he said no it had a liquid line Drier. If it was someone ease I might not believe it, but he knows these chillers and has seen them a lot.

Originally Posted by R123

I think he's talking about the drier on the oil scavanger line.

Originally Posted by FixItRight

I Don't have the serial I will see if I can get it. Did not see the unit myself but it was a drier not just a drier core. The guy that told me works for trane and I have known him for years. He works on a lot of of rtac and asked me if I had seen it before.

I think he's talking about the drier on the oil scavanger line.

I Don't have the serial I will see if I can get it. Did not see the unit myself but it was a drier not just a drier core. The guy that told me works for trane and I have known him for years. He works on a lot of of rtac and asked me if I had seen it before.

Originally Posted by FixItRight

I know of a new Rtac from Trane with a drier in liquid line so I guess it can now come with them.

Are you sure there is a drier core in there, or is it just a shell? Can you post the serial number?

I know of a new Rtac from Trane with a drier in liquid line so I guess it can now come with them.

Originally Posted by R123

There is only a paper element in the single core shell. There never was a drier in there (even before 2011). Don't put a drier in there. If cleanup is needed, make a cleanup kit by putting a drier and sight glass between the liquid line and bottom of evap like R404a described.

I finally got around to getting another oil sample to different lab.

They were all under 200 ppm, I can only guess that the first samples were bad somehow.

Thanks for the help.

Originally Posted by R123

There is only a paper element in the single core shell. There never was a drier in there (even before 2011). Don't put a drier in there. If cleanup is needed, make a cleanup kit by putting a drier and sight glass between the liquid line and bottom of evap like R404a described.

The drier I was referring to was the one added to replace the 3/8" wye strainer in the scavenger line.

Funny you mention a glass bottle. We get and send our oil samples out to Trane and they give you plastic bottles in the kits. above 300ppm is cause for concern.

Thanks for all your help.

Never knew there was not a drier in there, these machines are new to me.

Most of my chiller experience up to now has been with RTAA machines.

I will take the cheap route and send the oil off to another lab for retesting and see what happens.

BTW the lab that we got the results from states 200ppm of water is the upper limit.

Got a call into Trane to see what they think but the local office is not real good at responding real fast.

And I believe that this scavenger line has to have a slope ., I recall a SB on this.

There is only a paper element in the single core shell. There never was a drier in there (even before 2011). Don't put a drier in there. If cleanup is needed, make a cleanup kit by putting a drier and sight glass between the liquid line and bottom of evap like R404a described.

Originally Posted by Dallas Duster

So is the single core shell empty ?

It's not empty, but it has a paper filter cartridge in it. It's just there to catch debris. There is a very small strainer in the scavenger line going from the evaporator to the compressor.

think its a strainer

So is the single core shell empty ?

Originally Posted by Tech Rob

I've seen some issues with moisture contamination while the sample was in transit. If you're going to pull oil samples on these machines, you need to use a glass bottle with a gasketed cap. There are no drier cores to be replaced on any RTAC manufactured before 2011, either. Because of POE's affinity for moisture, the oil is the drier in the system. I have a document somewhere with the numbers. I'll try and find it for you. Paradoxically, R-134A systems are more forgiving than R-22 systems where moisture is concerned.

If the circuit went flat and was allowed to sit open for more than a day or so, I would have recommended an oil change on this circuit.

300 ppm I believe is max trane wants to see on oil48. change oil. is moisture indicator at exv yellow? if so, maybe a bypass filter, have a hose leaving the liquid line angle valve with a flare dryer, 303, entering into 3/8 line at the bottom of the evap and just crack the valve open at the evap.

rob

we use national for our samples, who is supplying you with a glass bottle

if there is ever a concern with an oil sample, then you need to resample. another oil sample and report is much cheaper than any chiller repair.