Can(would) one of you commercial guys help me understand the control wiring on a commercial pkg hp? Got a trane tch061c00ba, unit only runs on strip heat, and only when it pleases. Looked at the termal strips (marked Test-1 and Test-2) , had no voltage to common on any of the wires, I removed the white wire and when I put it back on there was a delay and the fan relay pulled in, then the strip heat contactor, but I still had no 24v to common on any t-stat wire including the white. On a resi system I'd simply jumper red to white and expect strip heat, red to y and comp, r to g fan. What's different about this thing?