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Posted by udarrell on June 20, 2007, 10:20 am
Greg White wrote:
>Hello All,
>I am installing a central air system in a house with an "Oil Furnace"
>and I need help with hooking up the control to turn on and off the
>cooling. The furnace controls has only 4 contacts for the heating and
>nothing for cooling. There is a 20V power supply on the system but
>unsure if I can use this. I believe I need 24v relay added. here are
>some photos for referance:
>http://picasaweb.google.com/eaglesnest1/Furnace
>Any help would be appriciated to get this connected will be greatly
>appriciated. Cheers,J.G.W.
>
>
If the oil furnace has a large rather round heat exchanger coming close
to the top of the furnace, use rails on the plenum and install the
evaporator coil as far above the furnace as is practical.
If you are using a cased coil I would use a transition between the top
of the furnace and the entry area of the cased coil.
Two main reasons for channeling the air into the intake area of the coil
is due to the fact that the air comes up the sides of the furnace &
"will cause excessive turbulence as well as be restricted Skyrocketing
Static Pressures & defeating Velocity FPM Pressure into and through the
coil."
That can cause and excessive pressure drop before the airflow gets
through the E-Coil, which is the worst possible scenario regarding both
Static Pressure and Velocity Pressure at the diffuser outlets, resulting
in horribly inadequate airflow, and also a Lack of an adequate Heatload
on the E-Coil!
The larger the AC, - will usually result in the least CFM Airflow Per
Ton of Cooling. Both the BTUH Capacity & the SEER Rating, - could be
reduced up to 50% or more. Plenty of research testing has borne out
these results, - don't end up paying for something you are NOT Getting.
(Click My Linked Pages) - udarrell
--
Crank Your Oil Furnace ACs Up To Mfg'ers Specs
http://www.udarrell.com/oil_furnace_heating.html
http://www.udarrell.com/oil_furnace_heat_exchanger.html
http://www.udarrell.com/air-conditioner-capacity-seer.html
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