All combination boilers should have an area thermostat fitted. Without one, you will see no real method for the atmosphere heat to be managed.
Volt terminals that are free
Some boilers have actually volt-free terminals. Due to the fact title shows, they are perhaps perhaps not linked to any energy supply, nor must any energy be used to them. These terminals are labelled A and B, however boiler manufacturers may have used alternative markings in the diagram
If the two terminals are linked together, the boiler functions. Whenever not linked, the boiler will not run. Therefore, a 2 cable thermoregulator is required. These would not have any charged power, and wiring is a 2 core cable involving the boiler and thermostat. (mais…)