what's the temperature coming out of an AC supposed to be?

[JohnCU]

the condo i'm renting has 3 vents, one in each bedroom, and one in the living room. however, i can leave the AC on all day and it doesn't get below 72~ in the place. even when closing the blinds, etc. i'm going to get a temp reader and stick it in the vent, what should it be optimally?

 

[Chaotic42]

My home inspector said 12-15F cooler than the intake air.

 

[KLin]

68.9 degrees.

 

[zinfamous]

Depends.

is there a mouse living in your AC?

:evil:

 

[Ronstang]

Originally posted by: Chaotic42
My home inspector said 12-15F cooler than the intake air.

Yes, according to my buddy who is an AC contractor the delta should be about 14 degrees. The funny thing is I have tweaked my system and have that delta at 21 degrees. Even he was amazed.

 

[JohnCU]

Originally posted by: zinfamous
Depends.

is there a mouse living in your AC?

:evil:

no, just some bulk beef that i'm trying to keep cool

 

[randay]

sounds like you have a clog in your system. you should be able to clear it up by placing a small wedge of cheese at the exit vents to your air conditioner. you'll need to replace the cheese every 1-2 days to keep your vents clear of any blockage.

 

[IAteYourMother]

take the mouse out of your AC

 

[zinfamous]

Originally posted by: JohnCU

Originally posted by: zinfamous
Depends.

is there a mouse living in your AC?

:evil:

no, just some bulk beef that i'm trying to keep cool

dude.

you're putting that in the wrong hole.

 

[QED]

Originally posted by: Ronstang

Originally posted by: Chaotic42
My home inspector said 12-15F cooler than the intake air.

Yes, according to my buddy who is an AC contractor the delta should be about 14 degrees. The funny thing is I have tweaked my system and have that delta at 21 degrees. Even he was amazed.

Ahhh... replaced your old compressor with one from the new Binford 6100 series? Right, Tim?

 

[Rubycon]

There's no set value actually. Deltas can be 10 degrees or 40 depending on design. (Fahrenheit degrees). At high loads (higher suction pressures) they will be lower. At lower loads, lower evaporator fan speeds, clogged filters, etc. they will be higher. (until the evaporator freezes over!) This assumes a fixed metering device (capillary tube). TXV's and AXV's are going to be completely different and are not used on most residential acu. This includes Carrier's piston accurator. (what a fantastic word! :laugh

There's plenty of references available on superheat/subcooling calcs if you're interested.

 

[JohnCU]

Originally posted by: Rubycon
There's no set value actually. Deltas can be 10 degrees or 40 depending on design. (Fahrenheit degrees). At high loads (higher suction pressures) they will be lower. At lower loads, lower evaporator fan speeds, clogged filters, etc. they will be higher. (until the evaporator freezes over!) This assumes a fixed metering device (capillary tube). TXV's and AXV's are going to be completely different and are not used on most residential acu. This includes Carrier's piston accurator. (what a fantastic word! :laugh

There's plenty of references available on superheat/subcooling calcs if you're interested.

psh, i'm electrical, not mechanical, get that junk outta here.

 

[SarcasticDwarf]

Add in clogged fan wheels to Ruby's list...that alone can change it by three degrees.

 

[Rubycon]

Originally posted by: SarcasticDwarf
Add in clogged fan wheels to Ruby's list...that alone can change it by three degrees.

Good gravy change those filters or get some real filters with pleated media like FARR instead of that angel hair junk! If a squirrel cage has enough crud on its blades that you cannot see the balancing clips, you definitely got a problem! :Q

OP: How hot is it outside? If you have a 1.5 tonne unit it just may not keep the indoor temp as cool as you like.

 

[jaqie]

I was going to say "between 50 and 65 degrees" but it seems Rubycon gave a much better, much more correct answer.

 

[2canSAM]

Just checked mine yesterday, Air temp at the outside compressor was 80F, coming out of the vents was 59F so i guess it is doing pretty well. I know last summer it ran constantly trying to keep the house 76F (Central Alabama humidity FTL). The outside compressor is in direct sunlight most of the day and this weekend I will be building a lattice shade house. Hopefully this summer is not as hot.

 

[jaqie]

That's a good idea. While you are at it, shield the copper piping on it from theft...

 

[JohnCU]

Originally posted by: Rubycon

Originally posted by: SarcasticDwarf
Add in clogged fan wheels to Ruby's list...that alone can change it by three degrees.

Good gravy change those filters or get some real filters with pleated media like FARR instead of that angel hair junk! If a squirrel cage has enough crud on its blades that you cannot see the balancing clips, you definitely got a problem! :Q

OP: How hot is it outside? If you have a 1.5 tonne unit it just may not keep the indoor temp as cool as you like.

it's about 75-80 outside. the unit is in the closet

 

[jaqie]

JohnCU: air conditioners have an outdoor and indoor section. Air conditioners basically move heat from one of the units to the other.

 

[2canSAM]

Originally posted by: Chaotic42
My home inspector said 12-15F cooler than the intake air.

Where is this measured from? The outside compressor or the ambient air temp inside?

 

[Bateluer]

You need it cooler than 72F? Thats way too cold.

 

[Rubycon]

Sounds like one of those package systems. If the outside humidity is <60% at those temps you either have an underperforming unit or a lot of pc's churning out heat!

Sounds like it's time for a service call.

 

[QED]

Originally posted by: 2canSAM
Just checked mine yesterday, Air temp at the outside compressor was 80F, coming out of the vents was 59F so i guess it is doing pretty well. I know last summer it ran constantly trying to keep the house 76F (Central Alabama humidity FTL). The outside compressor is in direct sunlight most of the day and this weekend I will be building a lattice shade house. Hopefully this summer is not as hot.

Shouldn't you be measuring air temps at one of your indoor returns and not at the outside compressor?

 

[2canSAM]

Originally posted by: Rubycon
Sounds like one of those package systems. If the outside humidity is <60% at those temps you either have an underperforming unit or a lot of pc's churning out heat!

Sounds like it's time for a service call.

Me or the OP?

 

[2canSAM]

Originally posted by: QED

Originally posted by: 2canSAM
Just checked mine yesterday, Air temp at the outside compressor was 80F, coming out of the vents was 59F so i guess it is doing pretty well. I know last summer it ran constantly trying to keep the house 76F (Central Alabama humidity FTL). The outside compressor is in direct sunlight most of the day and this weekend I will be building a lattice shade house. Hopefully this summer is not as hot.

Shouldn't you be measuring air temps at one of your indoor returns and not at the outside compressor?

Air returns were 74F