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Old 02-04-2013, 09:39 AM   #1
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Heater blowing cool air and duct is very hot?


Hi, I have several concerns here about my heater (for example, it seems like it's blowing cool air for too long before it turns warm), but why don't we start with this question to keep things simple. This is a "comfort maker" heater, btw.

My first question is, the duct that comes out of the top of the heater becomes way too hot to touch when the heater is on...it is too hot to touch all the way up to where it meets with the larger duct.

So my question is, is this normal or not? If it's not normal, could this be connected to some specific problem??


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Old 02-04-2013, 09:58 AM   #2
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Heater blowing cool air and duct is very hot?


That's the exhaust for the furnace and will be in excess of 350 degrees F.

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Old 02-04-2013, 10:06 AM   #3
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Heater blowing cool air and duct is very hot?


Wow.....Looking at the rest of the vent pipe and the furnace....wow....Who installed that crap????
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Old 02-04-2013, 10:06 AM   #4
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Heater blowing cool air and duct is very hot?


OK good to hear that's normal.

I have noticed that my heater blows cool air for a longer time than it used to before the air temp turns warm. What could be going on? There is no problem with the amount of air coming out, just the temp.
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Old 02-04-2013, 10:10 AM   #5
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Heater blowing cool air and duct is very hot?


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Old 02-04-2013, 10:11 AM   #6
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Heater blowing cool air and duct is very hot?


Quote:
Originally Posted by Technow View Post
Wow.....Looking at the rest of the vent pipe and the furnace....wow....Who installed that crap????

Don't hold back...what's wrong? I don't trust the people who built this house in 1980
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Old 02-04-2013, 10:17 AM   #7
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Heater blowing cool air and duct is very hot?


I don't think its the people who built the house. How old is that furnace?

1. They could have run double wall pipe all the way (insulated-cooler)
2. Not supposed to cut into double wall pipe (where the furnace ties into the big pipe.)
3. The tape isn't supposed to be used on that pipe.
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Old 02-04-2013, 10:31 AM   #8
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Heater blowing cool air and duct is very hot?


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Originally Posted by Technow View Post
I don't think its the people who built the house. How old is that furnace?

1. They could have run double wall pipe all the way (insulated-cooler)
2. Not supposed to cut into double wall pipe (where the furnace ties into the big pipe.)
3. The tape isn't supposed to be used on that pipe.

Eh. I wish I knew enough to help you help me more. I think it's probably about 10 or 12 years old. But, new HVAC people were here this summer putting me in a new a/c. The reason they didn't put in a new heater too is because they said something about something not being up to code and it would cost well over $10,000 to replace the heater. This was 3rd party info to me via the house owner, and it sounded so far out that I actually began to wonder if they are attempting to scam me.

Thoughts?
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Old 02-04-2013, 10:32 AM   #9
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Heater blowing cool air and duct is very hot?


BTW, I've lived here 14 years and the ducts have pretty much always looked the same. I think the heater was replaced a few years after I moved in, if memory serves me.
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Old 02-04-2013, 10:34 AM   #10
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Heater blowing cool air and duct is very hot?


Sorry, I can't edit messages, but I need to ask...does anything about my setup look *dangerous*? I have two CO monitors in my room.
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Old 02-04-2013, 10:43 AM   #11
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Heater blowing cool air and duct is very hot?


Just took some pics of the garage setup (heats the main level). From my understanding, the ventilation for the 2 heating units is tied together somehow instead of separate. which is the "out of code" problem the HVAC guy claims.

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Old 02-04-2013, 10:49 AM   #12
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Heater blowing cool air and duct is very hot?


I don't know what your local codes are. The vent piping does not look right. And that's the main thing our code jurisdiction looks for.

Also the flexible gas connector shown in your first picture isn't allowed here to go thru the casing.
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Old 02-04-2013, 11:42 AM   #13
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Heater blowing cool air and duct is very hot?


So is there a carbon monoxide or other risk here?
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Old 02-04-2013, 12:35 PM   #14
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Heater blowing cool air and duct is very hot?


No idea without being there...
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Old 02-04-2013, 04:36 PM   #15
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Heater blowing cool air and duct is very hot?


The furnace flue pipe has been cut into a b vent pipe. Thats a code violation. Not allowed to cut a hole in B vent. If the B vent is 8", then your water heater is not allowed to vent into it, as its to large for your 3" water heater flue. If the large B vent is only 7", then the water heater is allowed to vent into it.

Your furnace probably needs cleaned, may be even a minor adjustment to the manifold pressure.

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