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mangust13 02-18-2009 04:54 PM

Goodman furnace blowing lukewarm air

My brand new Goodman furnace blowing lukewarm air.
It works fine otherwise, but since day one I noticed that it blows longer than old one use to work, and always blows lukewarm air. Gas burns fine with typical noise, chimney pipe EXTREMELY HOT, but supply duct almost cold right after furnace. I have ho clue where the hot air disappears. As it all some how goes into chimney and only some return air somehow bypassing the furnace itself and being blown back to the house. Please anyone if you have any ideas. I should of pay attention earlier since it does it since the winter started. But I was just postponing taking care of it. Until I saw on the bill that it burns twice more gas as usually... Because it takes long time this way to satisfy thermostats request.
Thanks in advance.

beenthere 02-18-2009 05:29 PM

So what did you check?

mangust13 02-18-2009 05:45 PM

What do I have to check? Everything in general works fine. Kicks in when the thermostat commands to kick in. Furnace is working. But looks like all the hot air goes into the chimney. The coil part right after the furnace and air supply duct right after the furnace are lukewarm. Almost cool. As if air never went through the furnace.

yuri 02-18-2009 05:49 PM

Is the unit in a regular basement or crawlspace or attic? If in the latter 2 you may have a broken return air duct and it may be sucking back extremely cold air and dropping the supply temp. Have you tried calling the installer back to check the temp rise thru the unit etc.

mangust13 02-18-2009 05:52 PM

Installer will come tomorrow. Hopefully. But he was pretty puzzled after phone conversation. The furnace is in the warm finished basement and there is no outside cold air intake involved. That's for sure.

beenthere 02-18-2009 09:50 PM

Manifold pressure.
Draft pressure.

mangust13 02-18-2009 10:36 PM

Thanks. How to check it? I will try to find something using your keywords on Google. Right? Or you can tell me? Any pictures on the net I can look at to understand were this part is that can cause this? Looks like air stream somehow bypasses supply duct and all the heat goes into chimney. Furnace is roaring - but where the hell all this heat goes other than into chimney??? :).

beenthere 02-19-2009 04:58 AM

Need a manometer to check the manifold, and draft.

What blower speed is it using.

hughmacdiarmid 02-19-2009 02:22 PM

i'd say the furnace is working perfect! new furnaces are designed to blow cooler air for a longer time so that you get a better heat distribution throughout your house.

Does it eventually satisfy your thermostat? if its a two stage you can get the installed to adjust the time before the second stage kicks in.

mangust13 02-19-2009 03:33 PM

It does eventually satisfy the thermostat. That is the trick - while heating neighborhood through the chimney my bill got MORE THAN TWICE BIGGER instead of promised savings. If before it was heating the house in 5-10 minutes, now it blows lukewarm air much longer, while furnace roring heating up the chimney pipe. Obviously it burns twice more gas... I am talking consumption, higher prices per unit of gas is not an excuse... And about speed... I don't know... What ever speed it was set to have. I was never been told that it is up to me what speed it is running...

hvaclover 02-19-2009 04:20 PM

No body else picking up the inconsistency of the OP post? No body wondering why he seems to be speaking almost broken English sometimes while using some HIgh English phrases mixed with a smattering of technical jargon.?

Jeeze.. it another friggin' troll!:furious:

mangust13 02-19-2009 05:21 PM

The service guy just came over, changed the wires to run it on low speed and it is good now. It's nicely blowing hot air. So, you were right. Thank you all very very much.

Who is OP? And why "No body" is written this way by somebody without "almost broken English"?
Who is "friggin' troll!", dear HVACLOVER.
I just hardly understand that last post... What am I suppose to tell about it?

hvaclover 02-19-2009 07:38 PM

here's your reply Balky:

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