My furnace has a high a medium, and a low connection on its blower. I
am wondering which of these is on with the Heat, and which with the A/C?
I heard of two speed, but never of 3. My furnace is rather new and
has an exhaust blower as well.
Im trying to wire in an auxillary blower for the winter months.
Deciding between splicing in to existing 120v wiring, or adding a relay
inside the furnace and splicing into 24v wiring somewhere.
3 speeds is old news....been used for years....now 4, or 5 are common, and
with VS units, of course, 16 or more.
Its NOT to get more air into the home..its so that you can during
installation, to overcome or to reach the proper static pressure to maintain
proper operation of the unit.
Normally two speeds are used....the higher of the two for cooling, the lower
If you do that, there is a possibility of effecting your heat rise in a
Was the window added AFTER the unit was installed?
If not, either way, normally what you have in a case like that is a duct
issue, NOT a blower issue.
Either you are undersized on the supply, or simply required more than one
for the room, or its one of the rooms farthest from the furnace.
In that case, a simple bit of balance to the system might work wonders for
On Wed, 30 Nov 2005 18:01:03 -0500, "CL (dnoyeB) Gilbert"
Where I used to live we had a 3 speed fan, installed in the 1960's.
I moved the jumper to medium and that worked the best.
As for your wiring, do which ever is cheapest. Both will work.
Unless its a real long run, probably running 120v is the cheapest,
since that thinner LV wire is about the same price as 12-2 romex.
Of course this also depends on what you have to run the cable thru
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.