打算把老式的thermometer换成nest或是ecobee
家里的系统是heat boilers通过relay连接成了2个zone
relay里接着2根线，分别是接在控制器上的W和R
老式的控制器有G W Y R RC接着的，C wire留空
但是在relay里有一根枚红色的预留线，可以直接接relay的C
nest和ecobee都没有R这个接口，只有RH和RC
问他们两家的客服，都回答我说的是R和Rc之间是jumper，我说没有jumper，R来自heat
，Rc来自AC cooling部分，于是他们就搞不懂了
ecobee的客服更搞笑，非要和我你的C不可以用heat里来的C，一定要用AC里来的C，我
说C只是提供电源，有区别么？然后他非要说 The thermostat is designed that way
I'm afraid. C is a route back to the negative of the transformer the
thermostat is receiving 24V from, when we have two power sources entering
the thermostat they need to be kept separate, to do so the thermostat uses
the power it receives from the cooling equipment on Rc for power, meaning it
needs to return that power to that same source using the C wire. With the
thermostat connected to C at the heating equipment it will not be able to
run cooling and heating correctly.
我的理解是R接Rh，Rc依旧接Rc，随便找个能用的C wire哪怕接个transformer就可以了
，不知道这个理解对不对？
