HVAC pro opinions

[HunterCO]

From what you described it sounds like the A-coils are plugged not allowing air to flow through. When that happens they freeze up.

The other option is the A-coils are too small in which case they will freeze up causing the same problem. If the furnace can not send enough air through the A-coil that can also make them freeze up.

Sounds like you need somebody that has a clue to help you. I am just giving my .02 from what I have learned when the HVAC system was installed in my house.

My brother is a mechanical engineer who designs HVAC systems, He is also who installed my system while he was still in college working as a tinner to get his masters. I can ask him or if you want I am sure he would be willing to look at it.

Tim

[Great-Kazoo]

make all duct 6" supply and 8" return. how many return vents back to unit??
start there. NEVER close off any supply lines. this can cause icing of the coil.
a 2.5 ton condenser is under powered and over working for your sq ft. i'm runing a 2.5 on a 1600sq ft total home.

[bryjcom]

Sounds like the A-coils are plugged.

The reason you are not getting air flow is because the are plugged and/or frozen up.

If the blower wheels were gunked up then your coils are also. Why didn't the first technician realize that when he replace the blowers?

Need to pull the coils and hose them off which requires pumping down refrigerant, cutting lines and removing and after cleaning, reinstalling them, brazing lines back together and vaccumming system and opening service valves.

Sometimes they can be cleaned in place by pulling them out from furnace and combing them but in your case sounds like cutting the lines and getting a garden hose on them is the best route.

I would really have to take a look at them to tell you "officially" what needs to be done but screwing around with the duct systems are usually a waste of time.

PM sent also

[weemer]

Thank guys. The last contractor wants $477 to clean the coil. I'm going to pull the cover off and see what I can see. Good news is I contacted the home builder about the 2.5 ton a/c going into the 2 ton coils, and they are having an HVAC company contact me. We'll see if they can help.

[weemer]

I pulled the cover off. It is filthy on top as well as inside. There is a lot of trash on top of it. Must have fallen in through the vents.

I was able to peek inside the coil after getting the screws out, but there are 2 little plastic peices holding the cover on the bottom. Anybody know how to get them out? should I cut them?