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Taco SR502-4 Switching Relay - Unable to Power Two Ecobee4's?
I tried researching this issue but the solution still seems somewhat unclear to me. I'm in the midst of a major renovation and have had numerous issues with both the plumber and electrician and as such am trying to solve this problem myself.
A new Taco SR502-4 Switch Relay was installed for two heating zones by the contractor. An Ecobee4 thermostat was installed in each zone by the contractor. One thermostat receives power while the other does not. I've traced the issue back to the Taco Switch Relay. On the upper left corner of the circuit board there are two connections to provide power to the "C" wire. One seems to be getting approximately 27 volts while the other connection doesn't seem to be getting any power.
Ecobee support believes that the transformer is not sufficient to power both thermostats and I need a more powerful transformer and an isolation relay. Is this correct? It just seems odd to me that the second terminal is showing no voltage as oppose to low/or insufficient voltage.
Thank you for your time and assistance and I apologize in advance for any improper terminology.