Service Tech's numbers...

[beenthere]

Well, at 109* OD temp, with that low vapor pressure and Sh.

A guess would be, a restriction at the LLFD if its external to the condenser.
Or, a restricted or dirty indoor pistion,

You can refresh my memory.
Did it ever cool right.

[hvaclover]

Just a guess but I'm thinking Arizona....

My mistake. i was reading 21Degrees city and thought it was the OPs.

[mbarizona]

Yes, for the last 7 years it had no problem going down to 77 or lower during the summer.

This year, won't go below 80.

I set the tstat at 81. It gets to 82/83, unit kicks on and cools it to 80 and shuts off. Goes back up to 82/83 and the cycle starts again. If I set it at 80, it just runs for hours.

[mbarizona]

Just a guess but I'm thinking Arizona....

Good guess!

[beenthere]

Then your techs don't know what teh SH, and SC is telling them.

[mbarizona]

Then your techs don't know what teh SH, and SC is telling them.

Can you dumb that down to my level please? What does SH and SC stand for?

[21degrees]

My mistake. i was reading 21Degrees city and thought it was the OPs.

We don't use Manual J here different core temp and cooling days. Codes are alittle different so We have to use F-280 Canadian Edition.

[RyanHughes]

Can you dumb that down to my level please? What does SH and SC stand for?

Superheat and sub-cooling. These are readings that your service tech can and should take. They're used in charging systems with refrigerant.

[BigJon3475]

Superheat and sub-cooling. These are readings that your service tech can and should take. They're used in charging systems with refrigerant.

and diagnosis.

[mbarizona]

Thanks.

Superheat is 8* and Sub-Cool is 13*. Don't know what those mean to me, but that is what is written down.

[BigJon3475]

He left out some very useful information that is needed in determining capacity.

[Poodle Head Mikey]

.

[beenthere]

.

I don't know, can you.

Oh, you meant allowed to.

You can explain them. And then if you get your hands slapped. We'll know were not allowed too.