New Unico high velocity small duct system doesn't cool enough

[maurajd]

Hello and thanks in advance for your advice ...

We recently moved into a 100+ year old rowhouse in DC with a high velocity small duct AC system in place. The system never worked, so we had a brand new Unico system installed shortly after we moved in. The air handler is in the attic, and the compressor is outside.

Although the new system cools a couple of rooms upstairs very well, it does not cool the downstairs or the sunny upper rooms upstairs to our satisfaction. Can't get the sunny upstairs rooms below 75 degrees on a hot DC day. The downstairs has never been cool enough for us at all, no matter the outside temp.

How do we go about fixing this? The previous owners had capped some of the vents, which I understand is supposed to help somehow.

If the answer is that we need to work on the ducts or tweak the system, how do we go about finding a pro who really knows Unico systems? Our first installer seemed competent and has a good local reputation, but he didn't seem to do all that many Unico installations.

thanks!

[BaldLoonie]

You could try contacting Unico for local dealer suggestions.

In some cases when replacing these systems, additional runs are needed. Was that done? Capping vents makes things worse. Sounds like a well trained tech needs to look at airflow, number of vents, refrigerant level and see what's up.

[jmac00]

new system 'eh. anyone do a leak test? was the ducts in the attic changed. you could have air leakage in the attic. Nice hot attic air gets sucked into the duct system and mixes (raises) with the supply air. low refrigerant, dirty filters, incorrect fan speed..........there are a lot of things to look at here.

Call a local distributor and ask them if they have anyone that can look at it.

good luck, have fun

[UnicoSystem]

maurajd,

Please contact our local manufacturers representative for assistance:

Sassafras River Marketing
5904 Richmond Highway
Alexandria, VA 22303
703-317-4999

Regards,

Unico Marketing Department