I am installing new goodman 14 ser a/c unit

[craig marshall]

I was reading the install guide and it recomends to use 3/8LL and 7/8 SL When it is over 25 foot . I am at about 25 foot is 3/8 LL and 7/8 SL Ok or should i return the lines and go with the 3/8 and 3/4 . or will it work just fine with the biger lines I am installing a goodman 3 ton 14 ser with a vexar coil that is for a 13ser or higher

[Lash]

What have you typically done on other units you've installed?

[big sky hvac]

I was reading the install guide and it recomends to use 3/8LL and 7/8 SL When it is over 25 foot . I am at about 25 foot is 3/8 LL and 7/8 SL Ok or should i return the lines and go with the 3/8 and 3/4 . or will it work just fine with the biger lines I am installing a goodman 3 ton 14 ser with a vexar coil that is for a 13ser or higher

If you have the installation manual, then you should already have your answer. Hopefully you're replacing the evaporator coil too or else you're not going to have a 14 seer A/C. My nose detects the smell of DIY.

[tinner73]

the size doesn't matter!! just connect what you have.

[2old2rock]

Who reads the install guide?

[craig marshall]

its in not installed yet this is going into a mfg home with a colman heater .

[big sky hvac]

This definately sounds like DIY to me. You know, it probably would've been easier to just buy a Coleman A/C, to match the Coleman evap. coil you'll need to fit under your Coleman furnace. Then you can use their pre-made lineset too. But I'm guessing that Goodman was all you were able to buy online or from some parts house where you live. Good luck with your project.

[hvacvegas]

*sigh*

I don't think goodmans are rated for mobile homes, because of the crappy duct work.

Basically, your going to screw yourself over.

[kevster]

What have you typically done on other units you've installed?

LOL, excellent question!

[luskys a/c]

Craig -- Do you know why after 25' Goodman wants you to upsize your line set to 7/8"?

[namkrow66]

As far as the Goodman A/C being rated for Mobile homes that dosen't matter as long as the coil inside and the outside unit is a match and you don't run over the line set length you would be OK and it sounds like it is a prefab home not a Mobile home. Anyway it's a three ton and is a normal size for a Mobile home. It wouldn't matter what brand it is the part that has to be rated for Mobile home is the GAS FIRED FURNACE has to be for a Mobile home specs.

At least you are asking questions now and not after it is installed and not working right!!!!!!

Good luck & go by the book and not you backside

[hvacvegas]

As far as the Goodman A/C being rated for Mobile homes that dosen't matter as long as the coil inside and the outside unit is a match and you don't run over the line set length you would be OK and it sounds like it is a prefab home not a Mobile home. Anyway it's a three ton and is a normal size for a Mobile home. It wouldn't matter what brand it is the part that has to be rated for Mobile home is the GAS FIRED FURNACE has to be for a Mobile home specs.

At least you are asking questions now and not after it is installed and not working right!!!!!!

Good luck & go by the book and not you backside

Except that some equitment isn't rated to run at the static that some mobile homes run.

As I sit here, in this mobile home, I can tell you that 3 tons would be WAY oversized. There is no "normal size".

Atleast he's asking questions now, but he's asking on the wrong forum, and to a group of people not willing to help him screw himself.

[rickboggs]

Except that some equitment isn't rated to run at the static that some mobile homes run.
I thought he was talking split system

[namkrow66]

In this area 3 ton units are common and you use the units recommended for Mobile homes that are sized for the static pressure of the duct work. If you go over 3 ton you run the risk of high static with the duct work with the larger blower

[nes4ever69]

*sigh*

I don't think goodmans are rated for mobile homes, because of the crappy duct work.

Basically, your going to screw yourself over.

nahhh he isnt going to screw him self over, he is doing it himself to save money. ahhhh i can feel the savings now by not paying a contractor.

go with 3/4 since its cheaper then 7/8, you will save more money. better yet make it only 15' as that is about all goodman units are charged for and you wont have to buy and add freon. right there is more savings and the shorter line set will be cheaper to.

[hvacvegas]

I thought he was talking split system

He is. All equitment have ratings. Some are with static pressure.

Trailer ductwork is massively undersized. MASSIVELY. Systems in trailers use a high static to get the system to work.

[rickboggs]

He is. All equitment have ratings. Some are with static pressure.

Trailer ductwork is massively undersized. MASSIVELY. Systems in trailers use a high static to get the system to work.
Colman has a line for mobile homes, split and package. I was just assuming he was.... well, I was just assuming.