Follow up: Google Rep referred me to OnTech and the rep told me a few
things:1. Power Connector works without C Wire connecting to the board
and the connector still has enough power to power up Nest Thermostat. (A
bit skeptical but he reassured me fe...
I am in the same situation. My broiler uses TACO SR506-4 6 zone control
board and four of them are for heat so I bought four Nest Thermostats
and one Power Connector. I called the prof help but he only advised me
getting a professional help. I examin...