The issue you originally stated was that you were not getting your 4 second delay.
This is in the Zone on test flag.

If you look at your diagram, the start volume is outside the else satement for the Zone on, so it runs no matter what. Therefore, it would be the same if you put that statement both in the IF portion and the ELSE portion of the Zone On stmt. Yes its redunadant but only brought that up since someone mentioned the issue could stem from having nothing in the IF portion of the test flag. Thought it was a better idea instead of sending a command from a non-existing component.