Originally Posted by
THPRE
I think I can say optimal in that we are talking about reducing head pressure, not overall system function or performance. This test was done at the request of the Goodman representitive. I was watching the gauges when the ducts were disconnected under the house thus providing increased [optimal] air flow. I have no way of knowing what the changes were to the static pressure or the cfm with the ducts open and the filter removed but the pressures did not change. And after all the static measurements were taken with the system operational except that the filter was removed. Air flow static pressure was measured at .3 total . with fan at 144 cfm was 2140 , with fan at 88 cfm is 1647. I'm told you expect approx. 400 cfm per ton is that correct? How does a heat pump manage the difference in refergerant needs from cooling [large condenser] to heating with a smaller condenser?