How about installing a 1/2 x 1/2 x 1" Tee in your airline at the lowest point. On the 1" side of the Tee, install a simple 1" 24v irrigation valve (~$15) and run the 24v wiring inside the 1" poly line to your Gast pump location where you can install a simple 4-zone Orbit indoor/outdoor irrigation controller (~$39). Have your irrigation valve closed when your Gast pump is running and open afterwards for draining condensation. You could even cycle it open/closed multiple times over a 24-hour period if necessary.
Last edited by dg84s; 10/27/15 03:27 PM.
