We recommend sourcing new flange gaskets when opening the refrigeration circuit to ensure a leak-free seal

Simplified Serviceability: The combination control valve design replaces separate regulators and thermostats

Rated for temperatures up to 180F

For technicians sourcing part 51-21853-15

ensuring a precise 20°F differential for reliable equipment protection

Lochinvar & A.O. Smith 100208652 Control R-410A We recommend sourcing new flangeThe Lochinvar & A. O. Smith 100208652 Control is a precision engineered manual reset low water cut off (LWCO) designed for high efficiency hydronic systems. Operating on a 24Vac control circuit, this safety device utilizes a 3 8" NPT probe to monitor water levels within the heat exchanger or header, providing essential protection against dry fire conditions. The 100208652 model LTB024A S1 is a standard replacement for Knight fire tube boilers (models