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-   -   Need ideas, cooling guy gone, how can I better my numbers? (http://www.diychatroom.com/f17/need-ideas-cooling-guy-gone-how-can-i-better-my-numbers-112785/)

ddeennis 08-02-2011 10:13 PM

Need ideas, cooling guy gone, how can I better my numbers?
 
Took all your advise and called a HVAC tech. Told them I was having cooling issues and my temp above A-coil was 65 degrees. He told me ya it's high it should be high 30's and low 40's.


Had a tech guy come to my home and checked my a/c, this consisted of pointing his temp gun at one vent, went outside added 1 pound of freon and left.

On my bill this was stated.

"Air conditioner not cooling-Checked out the unit and checked the refrigerant levels and found the levels were still the same as when
it came pre-charged, But due to the high temp. this year we added
one pound of 410 A to the unit."


The bill was $74.40

Before he added freon my A-coil temp was 66.6 degrees after he added one pound freon it dropped to 63.0 degrees quickly.

My numbers in my house are as follows

house 80*
register 60*
A-coil 63*
return air 75-76*
humidity 42%
outside 105*

a/c always runs don't shut off from noon to 11 pm
noon 83* 5 pm 80 or 81* around 11 pm finally hits 78* and shuts off.

What can I do to improve a/c numbers to cool faster?

Raise all my floor vents to ceiling to gather hot air faster?
Add more returns?
Add more vents?

I have two filters in my system. 1 below the blower motor and one beside blower motor drawing off my return truck in basement.I have upflow Heil 14 seer 3.5 ton unit the return truck is on the back side of the unit.

The unit sit on a 4" concrete base off the floor. 4" concrete base is hollow thru the middle so the a/c unit can draw air from the bottom and the trunk is cut out at the bottom. so there is only a 4"x 30" window for air to pass thru. I put a 10" round tube on the side of the unit to the truck to pull more air.

Ideas would be nice where or what to do next.

REP 08-03-2011 01:05 AM

I don't believe you can do anything except get a contractor that knows what he is doing.
It seems your a coil is still too warm.You have no superheat or sub cooling numbers.
Having more return air at the furnace helps with air flow but if you want to satuisfy the house, the return air must come from the house.
From my house your system looks li9ke the coil is still too warm and your whole duct system is totally lacking both supply and return.
You may need more supply registers and house return.Maybe your fan is on the wrong speed.Maybe your a coil is letting too much air go around it.
Maybe your a coil is dirty on the blower side.
Way too many things to wonder about over the internet.

clocert 08-03-2011 09:26 PM

Your A-coil temp is 63. WHat is your vent air temp ? Also why is your return air temp different from your room temp ?

ddeennis 08-04-2011 07:16 AM

house 80*
register 60*
A-coil 63*
return air 75-76*
humidity 42%
outside 105*

WHat is your vent air temp ? as reported register (vent air) is 60 degrees.

Also why is your return air temp different from your room temp ?

because it draws in some of the cooler air that has been spit out only way to raise the return air temp would be to put all my return vents up near ceiling.

JJboy 08-04-2011 09:48 AM

First you need having a hvac pro to check why the AC is getting only 12-13 between A-coil and Return air. This number should be 16-20 range. Maybe he didn't add enough refrigerant.

Can you get these measurements at night after AC being running all day?

clocert 08-04-2011 02:08 PM

Something is wrong. A-coil is 63, vent air should be higher than 63, but you get 60. (Usually, A-coil should be around 40.) what is the air temp right after the A-coil ? Does the outside large pipe feels cold like a glass of ice water ?

ddeennis 08-05-2011 01:11 PM

update update update
 
O.k. I my wife went and paid the bill and the owner of the company saw my note about my temps in the house. His tech said the vents are 40 degrees he knows he checked them. ain't nothing wrong!

The owner said this is his unit and will stand behind it and will come by and check it out. Well the same tech showed up yesterday and was showing me the vent reads 39 degrees, I said that temp gun is not right, you can't sit there and pull the trigger til you find the lowest number it reads.And say that is the temp. Just because your gun is in the 30's don't mean it's correct.

I told him I used 3 different mechanical and digital gauges and they read 59 degrees or 60 degrees.

So I showed him, yep 60 degrees.

He goes to tell me he uses his gun for all his jobs and goes off the numbers it shows. I showed him my temp gun and showed him mine even reads way low in the 40's. Still doesn't make the guns right.

So I showed him the probe in the A-coil. he couldn't beleive the temp was 61.5 degrees.

Anyway he tells me he added very little freon the other day because he can't go off his freon pressure gauges because the heat makes them read funny.

So he tells me he adds freon til the temps drop in the registers.

So he goes outside and adds 3 pounds of freon to my system and I watch the temp at my A-coil fall to 57 degrees.

He comes back in and says he cant add no more because the "head pressure is 135 psi and adding more freon don't make the gauges move no more"

He goes on to tell me your system don't have a leak it has had the same pressure since new. he said the head pressure was 125 psi. before I added freon today.

Goes on to tell me that this system didn't have freon added when new because it comes pre charged from the factory and the numbers and temp looked good so we never added anymore. And your vents was blowing cold.

At this point I'm thinking I'm no hvac guy but this guy does it for a living and is a Dumb A. Even I know the system should be topped off when new, the factory don't know how long the lines are and such.

So I'm getting alittle pissed they didn't do this in the start.

The tech goes on to tell me I have a big system and it can hold 8 lbs of freon. So this means it was half full 3 lbs today and 1 lbs 2 days ago???????

Anyways we moved the digital probe at the a-coil to another side and it reads 53 degrees and my return air reads 75 degrees.

Tech is going to tell his boss what he found and see what he wants to do. The tech said the a coil should read colder then 53 degrees and still thinks there is an issue.

ddeennis 08-05-2011 01:17 PM

Just to recap

return air was 74-75
a coil reading 53.7-54.0 degress
register reads a solid 55 degrees

JJboy 08-05-2011 01:21 PM

Quote:

Originally Posted by ddeennis (Post 700949)
Just to recap

return air was 74-75
a coil reading 53.7-54.0 degress
register reads a solid 55 degrees

AC is ok.:thumbsup:

Marty S. 08-05-2011 05:07 PM

Quote:

Originally Posted by ddeennis (Post 700944)
O.k. I my wife went and paid the bill and the owner of the company saw my note about my temps in the house. His tech said the vents are 40 degrees he knows he checked them. ain't nothing wrong!

The owner said this is his unit and will stand behind it and will come by and check it out. Well the same tech showed up yesterday and was showing me the vent reads 39 degrees, I said that temp gun is not right, you can't sit there and pull the trigger til you find the lowest number it reads.And say that is the temp. Just because your gun is in the 30's don't mean it's correct.

I told him I used 3 different mechanical and digital gauges and they read 59 degrees or 60 degrees.

So I showed him, yep 60 degrees.

He goes to tell me he uses his gun for all his jobs and goes off the numbers it shows. I showed him my temp gun and showed him mine even reads way low in the 40's. Still doesn't make the guns right.

So I showed him the probe in the A-coil. he couldn't beleive the temp was 61.5 degrees.

Anyway he tells me he added very little freon the other day because he can't go off his freon pressure gauges because the heat makes them read funny.

So he tells me he adds freon til the temps drop in the registers.

So he goes outside and adds 3 pounds of freon to my system and I watch the temp at my A-coil fall to 57 degrees.

He comes back in and says he cant add no more because the "head pressure is 135 psi and adding more freon don't make the gauges move no more"

He goes on to tell me your system don't have a leak it has had the same pressure since new. he said the head pressure was 125 psi. before I added freon today.

Goes on to tell me that this system didn't have freon added when new because it comes pre charged from the factory and the numbers and temp looked good so we never added anymore. And your vents was blowing cold.

At this point I'm thinking I'm no hvac guy but this guy does it for a living and is a Dumb A. Even I know the system should be topped off when new, the factory don't know how long the lines are and such.

So I'm getting alittle pissed they didn't do this in the start.

The tech goes on to tell me I have a big system and it can hold 8 lbs of freon. So this means it was half full 3 lbs today and 1 lbs 2 days ago???????

Anyways we moved the digital probe at the a-coil to another side and it reads 53 degrees and my return air reads 75 degrees.

Tech is going to tell his boss what he found and see what he wants to do. The tech said the a coil should read colder then 53 degrees and still thinks there is an issue.

Ask the boss if he could send somebody out with a working thermometer,working gauges and that knows how to charge a system using superheat and/or subcool. Also ask where that 4 lbs went unless your line set is 100 ft long. Perhaps a leak check is in order,might also ask that the tech bring a working leak detector. If he can not provide that then it's time to find another company who can. Sorry dude, somebody has to make up the bottom 20% and I think you found one of them.


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