DVC500 at last wrote:
Wood'nCoal wrote:The heat exchanger did reduce the air flow in the ducts a noticeable amount, but it seems to be working.
John, you may want to go up one size on your blower motor. If you have a 1/4 HP motor, go up to 1/2HP to overcome the induced blockage/back pressure caused by the Heat exchanger.
You'll find out how much extra strain is bing put on that motor by how long it takes to burn out.
I'm planning on making my HX removable. I've got a 16x18" unit on the way which is a wee bit bigger than I wanted as it will take a little more sheet metal work, but I wanted to minimize the airflow resistance as much as possible. Even yet, while heating flow shouldn't be a problem, A/C airflow WILL be a problem in the summer. My furnace runs the blower on medium-low for heat and fan, but high for A/C. But even on high it has a hard time pushing enough cold air to the second floor vents. It doesn't help that the vents are on the FLOOR, either. SO the cold air just hugs the floor and falls down the stairs to the first floor and then on to the basement (it's all open stairs).
So I'll just close off the ball valves, loosen the unions and pull out the HX and cap off the hole in the plenum for the summer.