I am integrating a Nest Thermostat with an open automation software, and need to make it think its W, Y and G wires are connected to something -- normally a 24VAC relay driving 120V appliances.
How do you fake such a relay? I tried resistors down to 220 Ohm (connected to C wire), with no success, the thermostat still complains that nothing is connected.
Sure I could connect an actual relay, but I want something compact that will fit behind the thermostat panel. Plus I am sure there is a better solution than a resistor wasting power into heat -- near the thermostat temperature sensor what is more!