The relay on a boiler is the part of the boiler system which triggers the boiler to release heat when the thermostat calls for it. … The process of a boiler’s heating operation begins when the room that is being heated gets cold. At this point, the thermostat sends an electrical signal to the relay switch.

How does a thermostat relay work?

The two transformers provide the energy that the thermostat uses to connect the different relays. The relays in turn, turn on the energy to the fan and the air conditioning or the oven.

What is circulator relay?

Circulator relays on heating boilers – an older and by some heating service technicians, a preferred method to control the distribution of heat to individual building areas uses a individual circulator pump to force heating water through each individual heating zone piping.