Originally Posted by glennjanie
Your plan sounds good to me and the floor drain will not be a problem as long as the water in the trap doesn't evaporate out. We like to use an automatic trap primer in these cases but you can add a quart of water once a month and as long as the water reflects a full circle in the bottom you will be sealed.
I like your supply lines running down to the floor but it is not necessary in a basement. If it is mostly underground it is far easier to heat and cool.
Your supplies at the perimeter wall and the return being at the furnace, which is normally in the center of the house, should give you sufficient circulation of the air.
Quattro. The above advice is simply not the ideal methods.
First of all, it is best NOT to have any return air intake grille situated right at the furnace because it could "create a "negative" pressure and this can "draw" unwanted fuel fumes,flame,odor etc, in that immediate area.
Also,what happens if you 'forget' to add water to this floor trap.??? This sewer gas and odor would be sure to be 'sucked' right into the furnace duct system, whereas if the return was situated further away this would not be a problem.
A basement is no different than any other level in your home. Sure,the heat loss/gain is different because of the ground protection, but hot air (in the heat mode) still rises, so why not start the air to enter the room LOW where you are sitting or laying.
And it is also not uncommon to have a furnace installed elsewhere in the basement other than in the center.
Btw; I have 50 years experience in Hvac(now retired)