I have a Lennox G61MPV-36B-071-12 gas furnace. As best I can understand from the manual the low speed fan air flow is around 700 cfm. That causes quite a draft of cold air when the fan runs (without heat) by itself, pulling air in from outside. As a result, we don't use it as a means of fresh air circulation. If the fan could be slowed to say 150 cfm then the draft feeling would be less noticeable. Is it possible to do that? And if so, how? It has an ECM (I think that is what it is called -- low energy consumption, variable speed) motor.
I am considering adding an HRV to warm the incoming air to reduce the cold draft feeling further. It would tap into the cold air return for both outgoing and incoming air. I understand that the air handler on the furnace needs to run when the HRV is configured this way. Thus the reason for lowering the furnace fan speed to that of the HRV, which is 150 cfm.
I am considering adding an HRV to warm the incoming air to reduce the cold draft feeling further. It would tap into the cold air return for both outgoing and incoming air. I understand that the air handler on the furnace needs to run when the HRV is configured this way. Thus the reason for lowering the furnace fan speed to that of the HRV, which is 150 cfm.