7 8 Or 3 4

Greetings! New to this forum and to the world of deciphering HVAC lingo. I've done some research, just need help, delight! I can't decipher the installation guides for these several systems to know what to do.

I purchased my attached habitation (villa--one story, 1500 ft, with a double concrete wall between my dwelling house and the unit adjacent to mine) in Florida new in fall 2004, so the A/C and gas furnace is 12.v years former. Terminal week, I had no air at all, and the diagnosis was a leaky coil and bad compressor (very low pressure level; when repressurized, the compressor would not kick over). Nosotros discussed the price of repairing the electric current system vs replacing information technology, and they initially emailed me an estimate for a new TEMPSTAR 3 ton fifteen SEER system from Company A that included:
Condenser: NXA636GKA
Furnace: N8MXL0701716A
Coil: ENH4X3647A
Tstat:Honeywell 6000

Because I'd never heard of TEMPSTAR earlier, I got a 2nd quote, on a TRANE XR14 system they said they could fit (they use TEMPSTAR for smaller units only TRANE for everything else). My furnace is suspended from the garage ceiling in a recessed surface area.

I'd already called a second contractor, who came out this morning. She spent time looking at my current system (checking for signs of dirty or damaged ductwork--all good--checking connections, etc.) and told me my copper tubing was too small and would demand to be re-run. It's currently 3/iv" and she says it should be 7/8". This, of form, raises the cost considerably, plus the Carrier/this contractor is more than to begin with.

The organization they bid is the Carrier Comfort sixteen, with a TP-WEM01 connected thermostat (included this month from Carrier). When I expressed surprise that this larger unit would fit (and qualify me for boosted rebates), she said the width is what changes with furnace size, not the width, so I would exist fine.

The 2nd visitor is listed on both the NATE and ACCA sites; the sometime is not.

I'm willing to pay to practice the new tubes, if they are necessary; I don't know whether this is a new standard set since I got my firm, or if the original builder got it wrong (oddly, the warranty paperwork on the original organization is for a heat pump, and the second contractor said three/4" would exist fine for that but not an A/C), or if the requirements for the TRANE and the Carrier are that different...or if I don't really need this.

If I do need this on any new unit, I have concerns near the starting time contractor non checking. If not, I have concerns near the second contractor.

I repent for the length of this mail. Thanks in accelerate for any help!

How long are the lines? iii/4" vapor line is fine for 3 ton until you become to very long lines.

3/iv should be allowable with every manufacturers 3 ton R-410A organisation, and is the recommended size for some.
It won't void any warranties, and the 200-400 btuh of capacity difference volition never make up for the cost of the refrigerant lines.
The smaller line may really brand the organisation more reliable, as the oil return will be better, doubly true if the condenser is above the evaporator.
Some manufacturers even allow a five/viii suction line on a 3 ton R-410A organisation, though I wouldn't recommend it if the application doesn't make it extremely costly to replace the line.

At that place is more than to sizing refrigerant lines than the size of the stubs on the equipment.

The but real reason a lot of manufacturers switched to rating their equipment with larger suction lines was because information technology is a way for them to get an extra tenth of a point or so in the efficiency ratings, at basically no increased cost to manufacturing.

Now having said that, a new lineset, both suction and liquid, will guarantee that there are no contaminants remaining from the old system, or subconscious kinks in the lines within walls, etc., so isn't a bad idea at all.

Quote Originally Posted by bardolator View Post

No; the house is 13 years sometime, and the original unit of measurement was a three ton. Tall ceilings, and it's south Florida, so I'm guessing that's why.

There should exist a load calc done with ever chore. Bigger equipment isn't better. Most homes are congenital with oversized equipment and undersized duct. Which means your 3 ton unit never actually puts out iii tons.

Quote Originally Posted by bardolator View Post

No; the business firm is thirteen years onetime, and the original unit was a iii ton. Tall ceilings, and it'south south Florida, and then I'm guessing that'south why.

The size of the original unit means absolutely nothing. A load calculation is critical for your comfort and economy. Far more than important than the difference betwixt 7/8 and 3/four" suction lines.

Quote Originally Posted by bardolator View Post

If the load calculation was washed when the house was originally congenital, and they adamant I needed iii tons, they need to do it again? I've read about load calcs, but idea that was primarily for new structure or when considering changes in unit efficiency.

Never trust a architect's load calc. They typically have merely one done on the plans for the worst case inputs and employ it over and over once more. They are never adjusted to what was actually built.

And don't believe whatsoever hvac contractor that tells you one doesn't need to be done considering of this reason.

No, there should be one washed.
Original structure isn't e'er the greatest. Accept the new neighborhood backside mine.
Houses between 2000-2500 sq ft get 4 tons. 2500-3000 gets 5 tons. No load calculation was even washed. Just the issue of inexpensive construction.
At that place are stories from some of the guys hither doing retrofits about going back in with half the tonnage of the equipment they pulled out.
Specially in boiling Florida, yous want to make sure you have the right sized equipment for dehumidification.
Bigger isn't better

Quote Originally Posted past bardolator View Post

If the load calculation was done when the firm was originally built, and they determined I needed iii tons, they demand to do information technology once again? I've read about load calcs, but thought that was primarily for new structure or when because changes in unit efficiency.

That's a big IF.
My brother's brand new condominium in Cincinnati was built without a load calculation. I am over two hours away and I did not involve myself every bit much as I should. Their 2 story unit has the aforementioned size unit of measurement as all the other condos, many of which are 1 story. New construction is done equally inexpensively equally possible.
Their condo got a two stage furnace merely because I told them to specify ane. However, the contractor installed a single stage thermostat which could not utilise all the features of the two-phase gas valve or the variable speed blower.
The contractor didn't even register the equipment so the warranty would exist ten years instead of 5.
In retrospect, I should have specified every detail of their job but I expected the municipality would have some requirements for standards. Nosotros accept learned at that place are none. Even code standards are the bare minimum. The contractor has no incentive to do more more that.
Practice y'all recall the builder and HVAC subcontractor went beyond the minimum for your business firm?

I worked on a house that was built in 2014 last summer and both furnace and a/c were well oversized.........

To me a 13year old home is new build. Effectually tardily 1990'south and showtime 2000'south a lot of codes were changing for the betterment of energy efficiency.

A load calc will take your contractor about 2 hours at well-nigh and this volition ensure you take what you demand.

Once yous get the load back postal service them hither and nosotros will review it for you to make sure they did not fake the numbers.

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7 8 Or 3 4

New (7/viii vs onetime three/4) copper lines needed with new system? +Advice on new organization

New (7/8 vs old iii/4) copper lines needed with new system? +Advice on new system

7 8 Or 3 4,

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