A little more information.
When testing the electric heater port I discovered the relay that is plugged into that port is actually hardwired to the heater and to a breaker. It looks likes its supplied the line voltage to the heater. When I unplug that port the heater power goes out.
When I measure the voltage across the pins here's what I get
24 volts when heater automation is off
26 volts when heater automation is on
But it seems I can't use that port for the replacement relay anyway because it's used to supply power to the heater. I wonder why they wired it though that relay to supply power rather than going right to the breaker?
When testing the electric heater port I discovered the relay that is plugged into that port is actually hardwired to the heater and to a breaker. It looks likes its supplied the line voltage to the heater. When I unplug that port the heater power goes out.
When I measure the voltage across the pins here's what I get
24 volts when heater automation is off
26 volts when heater automation is on
But it seems I can't use that port for the replacement relay anyway because it's used to supply power to the heater. I wonder why they wired it though that relay to supply power rather than going right to the breaker?