We decided to leave the furnace where it is and run the trunk line 45’ W, and 6’ E from it. If we go two directions, should the line to the E be smaller because it is shorter?
What size should the legs be?
How much should we reduce the trunk line each time that a leg is added?
We were just going to add 4 vents to the Living room and 1 vent to the other bedroom, but while we are at it, there may as well be vents in the other rooms.
Trunk line going W 22x8:
45’ from furnace – leg going N 4’ to a register
42’ from furnace – leg going S 8’ to a register
32’ from furnace – leg going S 8’ to a register (if 4 registers are needed)
20’ from furnace – leg going S 8’ to a register
10’ from furnace – leg going N 8’ to a register
9’ from furnace – leg going S 27’ to a register
5’ from furnace – leg going S 8’ to a register
Trunk line at furnace 22x8 (45’ from W end of house; 6’ from E end of house)
Trunk line going E 22x8 ? (if we go two directions, should the E one be smaller):
Straight out from furnace – leg going S 3’ to a register
6’ from furnace – leg going N to two registers – 2’ and 10’
6’ from furnace – leg going S to two registers – 12’ and 24’
15 KW is when it is running on 240 volts. The furnace can also run on 208 volts which would be 11.6 KW. If you think that will be enough, we can put the upstairs on the same furnace. We were going to buy another furnace to connect the 3 bedrooms and 2 bathrooms on the second floor. Maybe the upstairs can be added to the trunk line that goes to the E.
Right now it is running on 208 volts with 2 vents in the large bedroom and 1 vent in the bathroom. There is a fireplace in the living room (we are just using fans to spread the heat).
Total distance E to W is 53’ 6”. It’s an old farm house that has been added to several times (inside walls use to be outside walls). I had a 2800 kg file that showed more detail, but I couldn’t upload it.