I had a Air Handler that has reznor gas duct heaters for heat. Everything is 220 volts and 24 volts. I measured to ground at the gas valve at the reznor unit i had 115 volts on one terminal and 115 volts on the other terminal on a 24 volt gas valve. I went back to the AHU and checked across the control transformer i measured 24 volts, i checked the same terminals on the transformer to ground and had 115 volts, A journeyman told me to ground the transformer and see if that fixed it, it did. Can someone explain why this happens, and what this is, so i can understand it.