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Old 09-03-2011, 09:32 PM   #1
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A/c Line sets


I am installing two 4 ton A/c units on the roof of my all concrete flat roof
what would be a good product to run the line set thru ? was considering using a 4 inch pvc plastic pipe for each unit, that way I should be able to replace line set rather easy should i ever have the need too. what is the industry standard ? if i avoid 90 degree elbows and only use two 45 degree
for gentle turns do you think I could pull line set 45 feet ? if the line set was all wraped and lubricated and complete pulling all at once ?

Thanks in advance

Coconut sunrise

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Old 09-03-2011, 11:07 PM   #2
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A/c Line sets


How long are these linesets (on the roof section), and where do they go down?

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Old 09-03-2011, 11:35 PM   #3
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A/c Line sets


Quote:
Originally Posted by coconut sunrise View Post
I am installing two 4 ton A/c units on the roof of my all concrete flat roof
what would be a good product to run the line set thru ? was considering using a 4 inch pvc plastic pipe for each unit, that way I should be able to replace line set rather easy should i ever have the need too. what is the industry standard ? if i avoid 90 degree elbows and only use two 45 degree
for gentle turns do you think I could pull line set 45 feet ? if the line set was all wraped and lubricated and complete pulling all at once ?

Thanks in advance

Coconut sunrise
Do not run it through anything.
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Old 09-04-2011, 07:14 AM   #4
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A/c Line sets


Thanks DOC
however I dont want to have the Concrete poured around the line set
where it goes thru the roof. I want to be able to pull a new line set in the event that I ever need to along with insuring no water leaks,

Master
these line sets will only go thru 8.5 inches of concrete roof to the A/c unit
before that they will run in a drop ceiling one will be 45 foot run and the other one will be about 20 feet

this drop ceiling is drywall so wanted to engineer a race that i could easily replace line set without tearing out drywall to replace line set should i ever need to

coconut
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Old 09-04-2011, 09:16 AM   #5
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A/c Line sets


I think the first step would be to see what local codes apply in this situation. I don't think I have seen pvc used in a roof penetration. Its usually a gooseneck sheetmetal fitting that has been flashed on the bottom, and then tar or foam into the top. I think spray foam deteriorates with the sun light and is not good at stopping water intrusion.

Don't take my word as gospel here. Anyone that knows me knows that I am mysteriously absent during installs.I will tear 300 black wires out of a unit and replace them all, but installation isn't for me .

Last edited by Master of Cold; 09-04-2011 at 09:21 AM.
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Old 09-04-2011, 09:26 AM   #6
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A/c Line sets


How about this roof jack device?

MODEL No. 353 Roof Jack for Refrigerant Lines


No affiliation with company.
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Old 09-04-2011, 09:29 AM   #7
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Yes..that's a "gooseneck" around here
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Old 09-04-2011, 09:35 AM   #8
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A/c Line sets


Called a "dog house" around here.
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Old 09-04-2011, 10:22 AM   #9
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I thought "doghouse" was the cover over the ductwork of a residential package unit....
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Old 09-04-2011, 02:48 PM   #10
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A/c Line sets


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I thought "doghouse" was the cover over the ductwork of a residential package unit....

My fault, I thought that's what was pictured. That's just a regular roof jack.
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Old 09-04-2011, 02:52 PM   #11
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A/c Line sets


here in the salt water air I think it would be gone in 2-3 years Pvc pipe with stucco would last longer IMHO

Coconut
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Old 09-04-2011, 03:39 PM   #12
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A/c Line sets


Quote:
Originally Posted by coconut sunrise View Post
Thanks DOC
however I dont want to have the Concrete poured around the line set
where it goes thru the roof. I want to be able to pull a new line set in the event that I ever need to along with insuring no water leaks,

Master
these line sets will only go thru 8.5 inches of concrete roof to the A/c unit
before that they will run in a drop ceiling one will be 45 foot run and the other one will be about 20 feet

this drop ceiling is drywall so wanted to engineer a race that i could easily replace line set without tearing out drywall to replace line set should i ever need to

coconut
Roof jacks are very common for roof top units. In fact it is code to use one for line sets around here as you can not just leave a gaping hole through the roof. Go with that.
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Old 09-04-2011, 08:05 PM   #13
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A/c Line sets


If you seal the jack on the inside and paint the outside with an elastomeric coating, corrosion shouldn't be a problem.
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Old 09-05-2011, 06:39 AM   #14
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A/c Line sets


Use the 4" PVC if you want to just put a 45deg ell on the vertical after you run all your line sets, thermo, power,etc. before the final hookups then fill in the end of the 45 with some type of sunlight resistance foam or equal.

PS: Use a roof vent boot stack to seal the roof and push the PVC through the rubber just like you would in a regular roof.

Last edited by COLDIRON; 09-05-2011 at 06:41 AM. Reason: added text
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Old 09-06-2011, 03:26 PM   #15
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A/c Line sets


I agree with COLDIRON.
Even cement roofs normally have common plumbing vents run through them.Those would be common 2",3",or 4" pvc.
Just call a local roofing wholesaler for the fitting.Should be fairly simple.

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