Central A/C unit freezing up...

[Blarg]

Hi guys. We had a central air system installed about 2 years ago. It never has really worked all that well. What happens is after the unit is on for about an hour or more, the unit inside the furnace freezes up. It just starts to blow semi cold / warm air. If I turn the unit off , it'll thaw itself out eventually and work again. I've had one guy come and look at it already and he says everything is working fine.. Obviously it's not. Suggestions? The small tube going into the furnace gets ice cold (Not shielded). All the vents in the house are open. It's a 3 tonne unit, 1800 sq/ft house.

Thanks

[Tony Hwang]

Hi, How often have you replaced the filter inside the furnace?

[U-Hate-Me]

1) Call the same guy back out to your house 2) Have him check the system pressures 3) As he's down there putting his gauges on, kill him 4) Call another company and repeat as necessary until fixed

[Noon-Air]

Make sure all your vents are kept wide open, change your filter, then call a

*COMPETENT* tech to correct the problems.

[The Freon Cowboy]

who installed this pos ? was this a diy ?

"Blarg" wrote:

Nhas really worked all that well. What happens is after the unit is on for

0about an hour or more, the unit inside the furnace freezes up. It just istarts to blow semi cold / warm air. If I turn the unit off , it'll thaw aitself out eventually and work again. I've had one guy come and look at it dalready and he says everything is working fine.. Obviously it's not. rSuggestions? The small tube going into the furnace gets ice cold (Not ashielded). All the vents in the house are open. It's a 3 tonne unit, 1800 sq/ft house.inThanks

[Stormin Mormon]

Does the small tube get cold before the large tube gets cold? That would tell us a lot. In any case, it sounds like something that needs a repair guy.

[<kjpro]

First clue...

[OLDHVACDUDE]

I guess that leaves you out. Fucking hack.

[<kjpro]

Ya think?

[Bubba]

What a stupid bullshit story or you&#39;re just a troll. A new system 2 yrs old that never worked right? Id say then that you&#39;re just about one of the dumbest fuqs (other than Stormy) on this planet. Rip that system out and pay for another self installed system. Make sure you and your buddy have plenty of beer while you work. Bubba

[Blarg]

When I first turn the system on, the small tube will stay warm for awhile. Takes an hour or more then it will get ice cold. The furnace filter is new, first thing I checked. All vents are wide open.

Thanks for the replies!

[<kjpro]

Which doesn&#39;t answer his question.

[jamesgangnc]

Often on an otherwise properly working unit that means the freon is low. But since it sounds like your unit has never worked properly there are many other things that could be the problem. The airflow over the inside coil could be too low. Was this unit added to an existing forced air heating system? The air handler inside needs to be rated to provide enopugh air flow for a 3 ton unit. The fan setting inside the unit needs to be on high for ac. It&#39;s not likely that you will be able to fix it yourself. Did you have the original installers try to fix it? How many times? Enough to figure out they are morons? You might need to get someone that knows what they are doing take a look at it, it&#39;s not likely that anyone will be able to diagnose it very well over the internet.

[Stormin Mormon]

With the liquid line starting warm, and then going to frosty, I&#39;m thinking either clogged filter, or maybe solder balled joint some where.

Hard to tell without a tech there at the house taking readings.

If it was low air flow, I&#39;d expect a frosty suction line, and an ice dam in the evaporator. But frosty liquid line?

[Stormin Mormon]

Tell us more about the cold tubes, please. Does the small tube get cold all the way out to the outdoor unit? Or just near the furnace?

Same question about the larger tube.

[<kjpro]

You suggest his blower needs to be on "high for cooling"? Is that the setting you always use?

[Noon-Air]

Yeah sure..... I can see it now... 125,000 BTU furnace with 1 hp blower on high and a 2 1/2 or 3 ton A/C

[U-Hate-Me]

Stor-On... Please shut the f*ck up.

[Bubba]

Time for the popcorn. This one outta be good. Its almost like shooting ducks in a barrel only with lots more stupidity. Bubba

[Stormin Mormon]

That&#39;s seriously good fortune telling. Now, what did President Bush have for dinner tonight?