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Subject Author Date
Return Air and Vent Air goodman 08-02-2006
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Posted by goodman on August 2, 2006, 6:18 pm
only getting about 10 degree diffents between return air and vent air

71 and 81 but really hot day over 100

most of the time
68 and 78 when in the 90's still not right


low side pressure is about 70 psi
goodman split system and upstairs unit

downstairs goodman unit working alot better

Unit Capacitor went out about 3 weeks ago. A/C man came and replaced
it. He checked the R-22 and said it was good. At time I did not notice
the air different. When the Capacitor died i turn off the system for
the day. So when the A/C man came is was in the 90 upstairs. When he
replace the Capacitor cold air was coming out not sure of the degree
of cold air but it was cold so he left. Now i know I should have made
him wait to see how it could bring the temp down.
We replace the filters every month. New system, new house only 4 years
old. I also notice not much water come out of the drain pipe like the
unit downstairs. The one downstairs drips really fast. But then again
for now only use the upstairs to play on computer. Master bedroom,
bathroom, living room etc all day stairs. so may not be too much
moister upstairs.

What should I check? And what should I make sure A/C man checks when I
guess I will have to call him back.


Thanks

Posted by on August 2, 2006, 10:42 pm

>only getting about 10 degree diffents between return air and vent air
>
>71 and 81 but really hot day over 100
>
>most of the time
>68 and 78 when in the 90's still not right
>
>
>low side pressure is about 70 psi
>goodman split system and upstairs unit
>
>downstairs goodman unit working alot better
>
>Unit Capacitor went out about 3 weeks ago. A/C man came and replaced
>it. He checked the R-22 and said it was good. At time I did not notice
>the air different. When the Capacitor died i turn off the system for
>the day. So when the A/C man came is was in the 90 upstairs. When he
>replace the Capacitor cold air was coming out not sure of the degree
>of cold air but it was cold so he left. Now i know I should have made
>him wait to see how it could bring the temp down.
>We replace the filters every month. New system, new house only 4 years
>old. I also notice not much water come out of the drain pipe like the
>unit downstairs. The one downstairs drips really fast. But then again
>for now only use the upstairs to play on computer. Master bedroom,
>bathroom, living room etc all day stairs. so may not be too much
>moister upstairs.
>
>What should I check? And what should I make sure A/C man checks when I
>guess I will have to call him back.
>
>
>Thanks


measure the supply air temp just as it leaves the evap coil, then at
the grill furthest from the furnace. Both should be the same temp. If
not, replace, upsize, seal and insulate ALL attic duct work.

Now do similiar for the return air. Measure temp at RA inlet at
grill, and then at furnace/air handler. Both temps should be the
same. If not, replace, upsize, seal & insulate ALL attic duct work.

your attic duct system is leaking so much air and probably sucking in
so much attic air your poor ac cant begin to cool your upstairs.

Posted by oloenneker on August 3, 2006, 4:32 am
gofish@gonefishin.net wrote:

>
> >only getting about 10 degree diffents between return air and vent air
> >
> >71 and 81 but really hot day over 100
> >
> >most of the time
> >68 and 78 when in the 90's still not right
> >
> >
> >low side pressure is about 70 psi
> >goodman split system and upstairs unit
> >
> >downstairs goodman unit working alot better
> >
> >Unit Capacitor went out about 3 weeks ago. A/C man came and replaced
> >it. He checked the R-22 and said it was good. At time I did not notice
> >the air different. When the Capacitor died i turn off the system for
> >the day. So when the A/C man came is was in the 90 upstairs. When he
> >replace the Capacitor cold air was coming out not sure of the degree
> >of cold air but it was cold so he left. Now i know I should have made
> >him wait to see how it could bring the temp down.
> >We replace the filters every month. New system, new house only 4 years
> >old. I also notice not much water come out of the drain pipe like the
> >unit downstairs. The one downstairs drips really fast. But then again
> >for now only use the upstairs to play on computer. Master bedroom,
> >bathroom, living room etc all day stairs. so may not be too much
> >moister upstairs.
> >
> >What should I check? And what should I make sure A/C man checks when I
> >guess I will have to call him back.
> >
> >
> >Thanks
>
>
> measure the supply air temp just as it leaves the evap coil, then at
> the grill furthest from the furnace. Both should be the same temp. If
> not, replace, upsize, seal and insulate ALL attic duct work.
>
> Now do similiar for the return air. Measure temp at RA inlet at
> grill, and then at furnace/air handler. Both temps should be the
> same. If not, replace, upsize, seal & insulate ALL attic duct work.
>
> your attic duct system is leaking so much air and probably sucking in
> so much attic air your poor ac cant begin to cool your upstairs.

Dang, I was just going to tell him he was a moron. But I like your reply
much better.

Posted by Stormin Mormon on August 3, 2006, 10:07 am
I woulda suggested the tech check superheat, and clean the condensor
coils.

--

Christopher A. Young
You can't shout down a troll.
You have to starve them.
.


Dang, I was just going to tell him he was a moron. But I like your
reply
much better.



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