How the device that shuts the gas off when a flame goes out actually senses the flame.
A flame supervision device, sometimes called a flame failure device, is the safety feature that stops gas pouring out when there is no flame to burn it. CENWAT expects you to know, in principle, how the two common types sense the flame.
Read the full Central Heating & Water Heaters note with Premium
You’re reading the free preview. PlumbRevise Premium unlocks the complete write-up, the worked detail for every Central Heating & Water Heaters note — plus timed tests on every module.
Plenty of modules are free to read in full.