On a Trane, When you use a single stage t-stat, the W1 and W2 will need to be jumper together..
So when there is a call of heat, the board sees power at both lead right away, then the timer kicks in to hold the 2nd stage back to X amount of minutes.
(Dip switches can be set for .5, 5, 10, 15 min delay)
Now if you use a two stage t-stat, jumper is not used, and when the t-stat calls for heat, the W2 isn't powered up right a way.. There is a sec delay on contact.
so, either the units shuts down before 2nd stage time runs out, or the dip switch is set up at 30 sec delay, and pretty much fires up in high stage right away.