Blog
How Low Water Cut-Offs Improve Boiler Room Safety
Steam boilers have two main safety devices: primary (LWCO) and auxiliary low water cut-off (ALWCO) switches. Water in the boiler should always remain at the normal operating water level (NWL). The low water cut-off switches are set below the NWL. The exact position below NWL varies, depending on boiler construction, but is set such that…