Indoor wb/db temps?

 

Didn’t grab a wet bulb just didn’t think about it but thermostat was sensing 75F. Humid day out today dry bulb would roughly be around 64. Dry bulb is 82.6

 

Airflow, or low return temp.
Where did you check your static.
Model numbers?

 

return temp was 72. Static pressure was taken right before the filter and i removed the high limit in the furnace for the other probe.

 

Coil Model: CNPVP2414ALA
Condenser Model: 113ANA024000

 

Seems like air flow. Is furnace in basement. Try removing blower door and see if there is a difference. What type of blower motor?

 

Thats one of those n coils. Do you have air flow across the whole coil?

 

And a 14in wide n coil at that.


Personally, I don’t think your moving 2 tons.
I’ve never seen a .49 static at full capacity.

That’s basically the static of the filter and the coil, with no ductwork attached.

 

Need to measure static after the filter and before the coil

If it's a N coil, make sure the sheetmetal block off plate is covering the top of slant coil on the right.

Low subcooling is the result of the low superheat. The txv is wide open causing the low superheat. The low sc is because all the refrigerant is in the coil and the txv is open so you don't have back pressure to cause the subcooling to stack up and rise


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Can’t have a overfeeding txv with low suction pressure, without having an airflow problem.


More like he has low airflow, and the txv has closed as much as it can’t to bring up superheat, but it hit max closed.
There’s no subcool, because there is no heat to remove, because nothing has been gained by the evaporator.

 

I have had n coils with just the small hard to clean part of coil dirty and misdiagnosed them as bad txv. After I installed new one and nothing changed I did a more through check and found extra n part dirty cleaned it and unit worked fine. I didn’t think that small part would make that big of a difference. But it’s a third of coil surface area and is first part to get dirty. I learned a useful lesson on N coils that day

 

Probably had a partially frozen coil at first. The final numbers say that your airflow is a bit low, but you're overcharged and that will drive suction pressure down on the typical TXV system, up to a point. Drop your subcooling back to 10°.

 

Recommended Subcooling for the system is 13. Coil wasn't partially frozen.

 

where is it located?

 

with the new TXV in place my superheat and subcooling look decent, not exactly where i want them but alot better than the previous txv. System subcooling will go above 9 now and my superheat is at around 16. Alot better than my previous of 0. It was the same temperature out the day i switch the Txv out as well. my low pressure is 105 compared to the previous 90, high side went up 20 psi as well cant remember the exact number.

 

Bet it does not have the recommended spacer installed between the coil and furnace either


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And looks fine until you get the call 5 days later.
They tend to do fine on startup, and it slowly catches up.