I'm studying for exams which revolve around sensors / nodes and I am struggling to describe the activity of nodes. The lecturer provided pictures but I cannot seem to fathom a logical way to explain how they work.
For instance, for the Honeywell Evohome 1) Sensor attached to the radiator detects the air temperature and sends signal <where> ?
I am also struggling to understand where the solenoid valve would be located and the lecturer neglected to mention it at all apart from in some past exam questions. I thought beside the boiler but when I've watched videos relating to these valves they're shown as being on the route between the water & and heater. I'm confused because I'm learning about domesticated systems and the videos are all more about mechanical engineering.