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Excessive moisture on outside surfaces of air handler

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Subject Author Date
Excessive moisture on outside surfaces of air handler GJ 08-15-2007
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Posted by Bubba on August 16, 2007, 6:17 pm
On Wed, 15 Aug 2007 20:52:02 -0800, "pRECISIONmachinisT"

>
>> When I pull my hand across the outside of our newly installed air handler
>my
>> hand comes back wet. This is true on most of the upper surfaces of the
>> unit. The installer says this is normal. I'm 70 years old and have had a
>> lot of Air Conditioners both old and newly installed and I don't ever
>> remember the outside of the AHU being wet.
>> Is this normal? Also there seems to be a lot of cold air coming from
>areas
>> where sections of the AHU are joined together. Would it be ok to use that
>> "foil" ducting tape to stop this air from coming out from these joints?
>>
>> Thanks
>>
>
>Well I'm almost 92 years old.and your perfectly welcome.
>
>Now suggest call the installer and tell him that I said that he needs to
>come back and properly set up the fucking god damned blower speed for you.

Lets not be too hastey with the installer although you could be
correct.
but what if the air handler is in the basement or garage and the owner
leaves the garage door or basement windows open??
Ive seen it many times.
Bubba

Posted by HVAC fella on August 16, 2007, 6:58 pm
'When I pull my hand across the outside of our newly installed air
handler my hand comes back wet. This is true on most of the upper
surfaces of the unit. The installer says this is normal. I'm 70 years
old and have had a lot of Air Conditioners both old and newly installed
and I don't ever remember the outside of the AHU being wet.
Is this normal? '

REPLY: It is frequent if thats what you mean by 'normal' . The surface
of the airhandler/supply plenum has reached the dew point of the air
which is why you have condensation on the outside of it. You need to
apply some half inch insulation such as fiber board to the outsides.

'Would it be ok to use that "foil" ducting tape to stop this air from
coming out from these joints?
Thanks
JW'

REPLY: Yes, but apply it when the surface is dry and at room
temperature. Make sure its not duct tape because it will dry and crack
then fall off in time. Use aluminum tape sold at Menards or Home Depot.


Posted by Zyp on August 17, 2007, 12:43 am
HVAC fella wrote:
> 'When I pull my hand across the outside of our newly installed air
> handler my hand comes back wet. This is true on most of the upper
> surfaces of the unit. The installer says this is normal. I'm 70 years
> old and have had a lot of Air Conditioners both old and newly
> installed and I don't ever remember the outside of the AHU being wet.
> Is this normal? '
>
> REPLY: It is frequent if thats what you mean by 'normal' . The
> surface of the airhandler/supply plenum has reached the dew point of
> the air which is why you have condensation on the outside of it. You
> need to apply some half inch insulation such as fiber board to the
> outsides.
>
> 'Would it be ok to use that "foil" ducting tape to stop this air from
> coming out from these joints?
> Thanks
> JW'
>
> REPLY: Yes, but apply it when the surface is dry and at room
> temperature. Make sure its not duct tape because it will dry and crack
> then fall off in time. Use aluminum tape sold at Menards or Home
> Depot.

I wouldn't use "any" tape bought from Home Do-Pot.

--
Zyp



Posted by on August 17, 2007, 11:44 am

> HVAC fella wrote:
> > 'When I pull my hand across the outside of our newly installed air
> > handler my hand comes back wet. This is true on most of the upper
> > surfaces of the unit. The installer says this is normal. I'm 70 years
> > old and have had a lot of Air Conditioners both old and newly
> > installed and I don't ever remember the outside of the AHU being wet.
> > Is this normal? '
> >
> > REPLY: It is frequent if thats what you mean by 'normal' . The
> > surface of the airhandler/supply plenum has reached the dew point of
> > the air which is why you have condensation on the outside of it. You
> > need to apply some half inch insulation such as fiber board to the
> > outsides.
> >
> > 'Would it be ok to use that "foil" ducting tape to stop this air from
> > coming out from these joints?
> > Thanks
> > JW'
> >
> > REPLY: Yes, but apply it when the surface is dry and at room
> > temperature. Make sure its not duct tape because it will dry and crack
> > then fall off in time. Use aluminum tape sold at Menards or Home
> > Depot.
>
> I wouldn't use "any" tape bought from Home Do-Pot.
>
> --
> Zyp


If you need tape, you need a new sheetmetal man. :-)



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