Drop capacity - orifices
Posted: Tue Oct 13, 2009 2:44 pm
I have a Nordyne KG7SA 090-24B furnace. It is oversized for current application, short cycles on airflow or high limit. I want to change orifices, which I believe are 47's and downsize around 20%. By the way, at 7000 foot elevation though furnace set up for sea level by default I think, so thought that would cut output enough, but not so. Five lobes, or am I just changing the one in the valve? Did heating work many years ago, but not now. I can do this, but need to know orifices I need and order.
Jim Kimmons
Jim Kimmons