I'm in the middle of rebuilding my entire AC system. I've got one 14" return and two 8" supplies hooked up to the blower (on a 2 ton system). I plan to add much more, but for now I want to start the outside unit and make sure the system is functional before I proceed.
I've had 3 different licensed HVAC professionals tell me that I needed to finish the ductwork before they could start the condensor -- otherwise the "pressures would be off"
I'm very confused. In my mind, the condensor and A-Coil are a separate closed-loop system from the air being blown across the A-Coil. So why would more/less ductwork ever affect the condensor and its "pressures"?