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Old 03-21-2012, 04:04 PM   #31
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Been we could go back and forth til you get what you want..the last word...but I have proved my point so I am closing the book.


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Old 03-21-2012, 04:09 PM   #32
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Been we could go back and forth til you get what you want..the last word...but I have proved my point so I am closing the book.

Cool. then the Op won't make them mistake of putting the lines under ground.
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Old 03-21-2012, 04:50 PM   #33
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If he does and uses Uncle's advice it won't matter if he buries them.
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Old 03-22-2012, 02:55 AM   #34
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If he does and uses Uncle's advice it won't matter if he buries them.
A trap doesn't help to prevent the slugging of the compressor.
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Old 03-22-2012, 05:56 AM   #35
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TWO PENNIES, How bout burying them and installing a suction line accumulator? Will that help the debate?
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Old 03-22-2012, 07:57 AM   #36
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Now you are being evasive.
You said a trap...not me...I said a P-trap ....



Bring a lunch Been ...we're gonna be here a while
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Old 03-22-2012, 05:29 PM   #37
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TWO PENNIES, How bout burying them and installing a suction line accumulator? Will that help the debate?
Suction accumulator won't stop migration. Nor keep the oil from coming out of the compressor. It will help to minimize or prevent liquid refrigerant from slugging the compressor. But won't guaranty that oil returns to the compressor quick enough.


Traps have their places. But traps always reduce velocity, and velocity is needed for normal oil return.

I have a 40 ton unit that has its line set buried. The buried section runs 90 foot. Then it 90's up 6 foot, and 90's to horizontal run of another 80 foot. And then 90's down for 10 foot.

There is a trap at the barrel its connected to, but it uses a double riser to ensure oil return, and its ran as a pump down system. Has no accumulator. And every spring when its started up, the oil level drops below the sight glass for a while unit the oil starts to return.

The liquid line has 1" thick insulation on it, and the suction line has 2 1/2 inch thick insulation.

Lines were ran to Trane's specs for this application.


The OP can chance it, and run them under ground. Worse thing that happens is he loses a compressor.
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Old 03-22-2012, 05:40 PM   #38
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Guess you don't get how to prevent slugging using properly fashioned piping.
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Old 03-22-2012, 05:44 PM   #39
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Old 03-27-2012, 06:03 AM   #40
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Suction accumulator won't stop migration. Nor keep the oil from coming out of the compressor. It will help to minimize or prevent liquid refrigerant from slugging the compressor. But won't guaranty that oil returns to the compressor quick enough.


Traps have their places. But traps always reduce velocity, and velocity is needed for normal oil return.

I have a 40 ton unit that has its line set buried. The buried section runs 90 foot. Then it 90's up 6 foot, and 90's to horizontal run of another 80 foot. And then 90's down for 10 foot.

There is a trap at the barrel its connected to, but it uses a double riser to ensure oil return, and its ran as a pump down system. Has no accumulator. And every spring when its started up, the oil level drops below the sight glass for a while unit the oil starts to return.

The liquid line has 1" thick insulation on it, and the suction line has 2 1/2 inch thick insulation.

Lines were ran to Trane's specs for this application.


The OP can chance it, and run them under ground. Worse thing that happens is he loses a compressor.
Thank you for you very long explanation but I really do not need it, please direct it to HVAC5646 he's the one your having the debate with and I agree with HVAC5646 and his explanation. If I need to bury lines I will the proper way and will have no problems with it. One more point were not talking about a 40 ton unit with a 90 foot line run. That's a different animal all together IE: Commercial/Industrial. Not DIY. HVAC5646 I do not recall issues with Uncle.
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Old 03-27-2012, 03:02 PM   #41
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My mistake. Guy I meant had "Iron" in his name also. But it was not you.
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Old 03-27-2012, 04:44 PM   #42
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My mistake. Guy I meant had "Iron" in his name also. But it was not you.
Coolio
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Old 03-27-2012, 04:54 PM   #43
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Thank you for you very long explanation but I really do not need it, please direct it to HVAC5646 he's the one your having the debate with and I agree with HVAC5646 and his explanation. If I need to bury lines I will the proper way and will have no problems with it. One more point were not talking about a 40 ton unit with a 90 foot line run. That's a different animal all together IE: Commercial/Industrial. Not DIY. HVAC5646 I do not recall issues with Uncle.

You brought up the suction accumulator, so that just happens to be the post I quoted.

The 40 tonner, was an example of an underground line set with the evap below the condenser.

Since you said "If I need to bury lines". I take it that you haven't had to bury any yet. Is that correct?
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Old 03-27-2012, 05:25 PM   #44
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How bought just use a ll solenoid valve as a stop valve on the off cycle???

No migration = no problem???
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Old 03-27-2012, 05:33 PM   #45
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How bought just use a ll solenoid valve as a stop valve on the off cycle???

No migration = no problem???
LLSV at the indoor coil helps eliminate a lot of the possible problems. But works best when done as a pump down system.

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