|
Posted by CL (dnoyeB) Gilbert on August 2, 2005, 2:01 pm
Carolina Breeze HVAC wrote:
>
>>I am adding an auxillery fan to my HVAC. Actually two; One for my computer
>>room where the computers keep it rather toasty, and one for my bedroom
>>where the large number of windows keep it rather 'outsidey.'
>>
>>I want to start with the bedroom one which is already installed in the
>>duct. I have run the wiring to the furnace area. 3 wires; power and
>>ground. Wiring nailed into ceiling floor joists, etc.
>>
>>The question is what to do now? I want to use a relay so the aux fan
>>comes on when the HVAC blower is on.
>>
>>So I have a relay that I need to mount somehwere. Its coil will be on the
>>HVAC control which IIRC is 24vac. Its NO contact will connect from a
>>switch which will be powered by the main furnace switch next to the
>>furnace. This is lookin nasty though as it seems I need to install some
>>connectors on the wires and plug them in, or maybe find a relay with screw
>>terminals!?
>>
>>I am assuming this relay needs to be mounted to something and in some kind
>>of enclosure? I intend to put it in a normal switch box mounted to a
>>floor joist in the ceiling.
>>
>>I am assuming the wiring needs to be in metal pipes? Also does the 24vac
>>need a seperate pipe from the 120vac wiring?
>>
>>Is there a simpler way?
>>
>>This is a pretty small fan which I believe is < 1A load for 120VAC. I'm
>>an electrical engineer but not an electrician. I don't know the rules but
>>I'd like to follow them if I can learn them.
>>
>>
>>--
>>Respectfully,
>>
>>
>>CL Gilbert
>
>
> With all due respect:
>
> Adding aux fans is the LAST thing you do.
>
> If you have a cooling problem due to airflow, the fans may mask it, but they
> will not cure it.
>
> You can only get X-CFM down a duct of X-Diameter at the proper static
> pressure.
> Velocity of the air has to be taken into consideration and if your aux fan
> will not handle what you need to equal the proper airflow to deliver enough
> BTUh back to the unit, then you have wasted time.
> Normally, air flow issues are due to poor duct design, or proper duct design
> based upon the original use of the home, or room, and if you have added a
> heat load to it, then adding a fan to try to increase the air flow to the
> room prob wont help, and even if it does, what have you done to the balance
> of the system?
>
>
>
Well this is all I could think of. As I stated, the bedroom's
temperature is off in my opinion due to higher heat loss than other
rooms due to so many windows. It also has a vaulted ceiling.
The computer room stays HOT, even in the winter due to added heat
sources within the room. The rest of the house is pretty nice,
including even the basement. I can't keep the doors open since my Son
would enter the room and put his signature on it...
So increasing cooling in summer and heating in winder to the bedroom is
my objective. So I added a fan...For the computer room I could drill
holes in the wall, and run a radiator outside and cool my computers with
a water cooling system. But im hoping for something less obtrusive.
The master bedroom is the farthest room from the furnace, being on the
2nd floor and other side of the house. The computer room is on the 2nd
floor, but basically above the furnace.
Perhaps for the computer room I could put the fan on the return?
Ideas?
--
Respectfully,
CL Gilbert
| 
Yahoo! 
Google 
Windows Live 
del.icio.us 
digg 
Netscape 
XML Sitemap