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Old 03-20-2012, 06:22 PM   #16
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AC lines and sunlight


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You're from planet Stroke, aren't you? Must not be thinking all that well since your trip to that vast dryland.

Hell yes it can and does and no, ground is unstable at any depth. Come on down to Houston and see what happens to buried lines.
Do you mean "no ground is stable at any depth"? If so you are wrong: Thermodynamics 101 and high school geology, remember.

And since we are talking about lines in PVC (not run unprotected) sealed at each end, what can happen?

If you bury lines unprotected they will corrode from the soil chemistry.

Crap...I'm played out..

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Old 03-20-2012, 06:33 PM   #17
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This is the first I'm hearing of lines being in pvc which is the proplem or the lack of pvc rather would be. We come across ancient lines which once were insulated in insultube buried that has long since eroded and thus leaks and kinks and all such nightmares occur, why no one buries lines around here.

Not even sure you can by city code, never looked into it as I've never needed to.
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Old 03-20-2012, 06:34 PM   #18
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"Planet Stroke", that's pretty dang funny, now.
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Old 03-20-2012, 06:34 PM   #19
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Thanks for the responses everyone!
---

Some more information... In addition to the (approximately) 20 feet OUTSIDE the house there will be another 25 feet inside... this portion will be within the (insulated) joist space. The system is 24,000 BTU ~2T. From where the lines exit the house to where the condenser is being set is 20LF of line.

I'm figuring to trench some anyway (for the electric I'm doing) and the OCD in me likes the idea of not having the lines exposed to dogs and kids in addition to the thermal aspects of the direct sunlight... but frankly, all the extra valves and components and install detail now has me worried that the local service and install guys will either just be confused or really screw it up.
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Old 03-20-2012, 06:35 PM   #20
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I'm wondering why you can't simply put it three or four feet from the home..?
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Old 03-20-2012, 06:43 PM   #21
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I'm wondering why you can't simply put it three or four feet from the home..?
Well, aside from my (legitimate and real) design issues...
then you wouldn't have this thread to sort out the particulars
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Old 03-20-2012, 06:58 PM   #22
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And it's probably 20 feet from point of entry from the house to the condenser point of termination. That makes less than 20ft.

And did you ever consider insulating the the ID volume of the PVC chase or conduit?
Doesn't help in winter.

All of my under ground lines are insulate. All except 1 is a pump down system. And the one that isn't pump down, was done to York's specs. They drew it out and stamped it. And it has migration, and the compressor is loud.
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Old 03-20-2012, 08:14 PM   #23
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"Planet Stroke", that's pretty dang funny, now.
Why do you have to post something so hateful?
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Old 03-20-2012, 08:16 PM   #24
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Doesn't help in winter.

All of my under ground lines are insulate. All except 1 is a pump down system. And the one that isn't pump down, was done to York's specs. They drew it out and stamped it. And it has migration, and the compressor is loud.
You run ac in the winter?
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Old 03-20-2012, 08:56 PM   #25
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Why do you have to post something so hateful?
Seriously? That's not hateful one bit. Geez, kid.
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Old 03-21-2012, 02:11 AM   #26
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You run ac in the winter?
The migration happens weather or not your running the A/C in the winter. And in the spring when its is turned on for the first time, the compressor runs without enough oil in it.
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Old 03-21-2012, 05:55 AM   #27
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You're from planet Stroke, aren't you? Must not be thinking all that well since your trip to that vast dryland.

Hell yes it can and does and no, ground is unstable at any depth. Come on down to Houston and see what happens to buried lines.

" I didn't know you were so funny Doc I freaked when I saw that and LMFAO" I think it runs in the family.
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Old 03-21-2012, 09:00 AM   #28
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The migration happens weather or not your running the A/C in the winter. And in the spring when its is turned on for the first time, the compressor runs without enough oil in it.

And if "migration" (not the right word ) occurs in winter it's immaterial.

You are forgetting what Uncle (and I) pointed out concerning the piping.

Migration is not the issue. Migration is the movement of refrigerant due to temp differences between the two points. In the spring time on a first time start up the comp is FLOODED with oil mixed with refrigerant.(unless a crankcase heater is installed on comp. Barring that, a few days in the warmer ODA is enough to equalize the system pressure and the oil will be miscible with the refrigerant and distributed thru the sealed system and the comp oil sump full. Than the comp can be safely started with no danger of losing lubrication).

The refrigerant remaining in the suction line is not there from "MIGRATION".

It is there be cause it is TRAPPED on the off cycle, vapor in the suction line that has condensed to liquid.

No body can deny that normal refrigerant migration occurs between the condenser and evaporator in winter temps, but in a above ground line set all the refrigerant and oil in circulation returns to the condenser and very little remains in suction line and evaporator.

That being said, there still remains the vapor and oil in the buried lines. It is there not thru migration but is TRAPPED, other wise it too would find it's way back to the condenser.

I refer those who are interested to look up the definition of MIGRATION and an OIL TRAP and the function of a "P" trap.
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Old 03-21-2012, 09:02 AM   #29
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" I didn't know you were so funny Doc I freaked when I saw that and LMFAO" I think it runs in the family.
Yes it does run in the family, I am proud to say.

And we both know this is just a shot from you given your history with Uncle.
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Old 03-21-2012, 03:56 PM   #30
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The oil migrates with the refrigerant toward the colder/coldest part of the system. There will be plenty of liquid refrigerant and oil in the lines under ground. Even if the air handler is in the basement and below the condenser.

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