Replacing A coil with N

[jvrba1]

Hi I'm looking for some advice.
I have a 3 ton Carrier Condenser (Straight A/C) with a 3 ton Whirlpool air handler. The A coil had leaks so it was replaced with a "N" coil. The original unit had a piston the new coil has a TXV. I'm having issues with the coil freezing up. The bulb is securely mounted (factory). The unit was charged per manufaturer recommendations. (Super heat). Am I missing something?

92 degrees outside 86 RH. Indoor WB 75.5, 29 degree superheat.

Any clues?

[jvrba1]

The new N coil was what Carrier Mid-atlantic recommended replacing the A coil with.

[beshvac]

1. You don't charge a txv by superheat
2. You don't have matching equipment
3. What are the model numbers of the carrier and whirlpool?

[jvrba1]

Condenser - Carrier 38EN0363205M
Air handler - Whirlpool 4386CE41397
New N Coil - CNRVU3617ATA

[HAP2]

I would say that the biggest thing missed is how it was charged. Not sure if you could get an accurate wiegh-n due to non matched components. Only option is subcool charge.

HAP

[darctangent]

Correction -


I have read your past posts.

Either you are a bad as average tech that is afraid to come out and admit it or you are a meddlesome DIY.

You know site rules prohibit DIY.

Cease please.

I won't help any longer.

[jvrba1]

TXV is fixed no adjustment.
Could be the air flow, unit is very clean for it's age. filter is brand new.
A member on the site told me the unit should not be charged via super heat now that a TXV is in the equation. How should a TXV unit be charged? Sub cooling?

[beshvac]

Who installed that coil.....

and was it one of the "counter guys" that only know what their computer tells them (and the computer would never tell them that was a matchup) that told you it would work?

[darctangent]

READ PAST POSTS BY OP

POSTER IS DIY

[jvrba1]

Yes it was a counter guy who sold the coil.
Who is OP and where can I find the posts?

[beshvac]

Well the counter guy can now successfully match a new condenser to the oversized coil (as long as the current compressor doesn't burn-out and fill the system with acid and/or they have any R22 condensers available) :cliff:

[darctangent]

Well the counter guy can now successfully match a new condenser to the oversized coil (as long as the current compressor doesn't burn-out and fill the system with acid and/or they have any R22 condensers available) :cliff:

I'd recommend increasing the lineset size to 1/2" and 1 1/8 that'll fix it.

[jvrba1]

How do I know that increasing the line set will not create another problem?
The line set is 3/8" and 3/4" what will increasing the sizes do for me?
Tell me what's going on with the refrigerant? Why is the coil now oversized?
3 ton Air handler with a 3 ton evaporator coil and condenser. What Am I missing?

[woody19]

I'd recommend increasing the lineset size to 1/2" and 1 1/8 that'll fix it.

LOL you're bad

[beshvac]

How do I know that increasing the line set will not create another problem?
The line set is 3/8" and 3/4" what will increasing the sizes do for me?
Tell me what's going on with the refrigerant? Why is the coil now oversized?
3 ton Air handler with a 3 ton evaporator coil and condenser. What Am I missing?

You have an 8 seer condenser from the 80's......
You now have a coil from 2011 made to work with modern 13-20 SEER condensers........

:worthless:

[catmanacman]

38 degree superheat on a txv coil time to find a installer that has a clue