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Struggling with understanding the sensor heaters (Honeywell Evohome)

Hello,

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.

Cheers

submitted by /u/RD_L
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