Performing PM's at a site today ran into an issue with a Trane Varitrac:
My issue is that the bypass dampers(twined together) are not receiving 24VAC from the TB4 terminal, is this supposed to be a constant supply or is there another reason I would not be receiving power? It is a 3 wire control 24V,Open,Closed. I removed the connections from the board to see if that was an issue but still no power. The computer system show my modulation from 0-100% so I know that it should be modulating.
I'm not very proficient in controls so any help would be a appreciated.