My central air is not cooling correctly. HELP

[new dad]

Well I have a split system and I turned it on yesterday and noticed it wasn't cooling correctly. It would cool down to 76 degrees and not any cooler. the system stays on. So i cleaned the condenser and a coil, changed filter and checked duct work. I threw the gauges on it and it was right on. Low side was around 60 lbs and the high side was 220lbs. It has boggled my mind on this one. It seems like it isn't condensating alot in the acoil. Does anyone have any suggestions. thanks

[VTP99]

Well I have a split system and I turned it on yesterday and noticed it wasn't cooling correctly. It would cool down to 76 degrees and not any cooler. the system stays on. So i cleaned the condenser and a coil, changed filter and checked duct work. I threw the gauges on it and it was right on. Low side was around 60 lbs and the high side was 220lbs. It has boggled my mind on this one. It seems like it isn't condensating alot in the acoil. Does anyone have any suggestions. thanks

What was your outdoor air temp. ?

[new dad]

90

[VTP99]

You should get your subcooling & superheat readings. Can't go into much detail per site rules. Are you in the trade ?

[new dad]

not really. I did a little studying and got my hvac license and never pursued it.

[catmanacman]

are you sure them pressures are right on

[eric1589]

how old is the equipment? maybe it cant keep up with demand any longer

[udarrell]

Well I have a split system and I turned it on yesterday and noticed it wasn't cooling correctly. It would cool down to 76 degrees and not any cooler. the system stays on. So i cleaned the condenser and a coil, changed filter and checked duct work. I threw the gauges on it and it was right on. Low side was around 60 lbs and the high side was 220lbs. It has boggled my mind on this one. It seems like it isn't condensating alot in the acoil. Does anyone have any suggestions. thanks

Well, 60psig suction is only 34-F, normal suction usually runs higher than that on later model units.
What's the indoor coil metering device; is it sized right?
Any temp changes (at driers, etc.) on the refrigerant lines?

220psig head is 108F condensing temp - 90F ambient is 18F delta T, which appears in the ballpark.

Do you know how to get the subcooling & superheat readings?

Indoor airflow across the coil ought to be checked.
Check A.H blower wheel blades for lint buildup, etc.

Maybe it doesn't have a serious problem...

[cmp240]

Filter clean?Cond coils clean?,S.H S.C,60 sounds a little low for that outside air temp,(low side)

[seanddd]

I would check for refrigerant restrictions across metering device and f/d.

[skippedover]

See the above answers. Unless you can get to the pro side, you're only going to get a lot of guessing and much of it, while well intended, is going to be incorrect. If you can't filter through it all, you may end up getting very dizzy chasing your tail. DIY is not allowed and since this side of the site is open to the public, any responses can be used for DIY purposes. 'Nuff said.

[new dad]

The system worked great last year. I think it might be about 10 years old. I think I will check the temps at the dryer and other places like was suggested. I will also check the blower fins as well. I thought maybe the dryer filter was getting clogged so I will check the temps at both ends on that. I dont have a temp gauge to check the lines so I might go get one. thanks for all the help

[VTP99]

60 sounds a little low for that outside air temp,(low side)

:ditto:

[Tommy1010]

:ditto:
:ditto:

:cheers:.......

Only thing I would change in that statement is 220 sounds low for 90° outdoor...not indoor.

Head raise = suction raise.

Especially a 10yr old unit. Not as efficient, and runs at higher heads.

But at 90°, is he expecting 65° indoors? Hard to accomplish with a decade old system.

[VTP99]

:ditto:

:cheers:.......

Only thing I would change in that statement is 220 sounds low for 90° outdoor...not indoor.

Head raise = suction raise.

Especially a 10yr old unit. Not as efficient, and runs at higher heads.

But at 90°, is he expecting 65° indoors? Hard to accomplish with a decade old system.

:ditto::ditto:

[cmp240]

Ditto,Vtp99,Its hard to help someone when you cant help diy'ers varibles,Temp drop,coils clean,wet,dry bulb,venting,rtn air,filter,blwr speed,clean blwr wheel,blocked vents,returns,and on,and on,and on,,,,,,,,,,,

[udarrell]

Ditto,Vtp99,Its hard to help someone when you cant help diy'ers varibles,Temp drop,coils clean,wet,dry bulb,venting,rtn air,filter,blwr speed,clean blwr wheel,blocked vents,returns,and on,and on,and on,,,,,,,,,,,
He needs to find a good Tech that knows how to check every detail!
:callpro: