the Robertshaw 5300-029 Electric Thermostat serves as a high-precision SPST snap-acting switch

Note that when used in a 3-way configuration

the NEMA 4X enclosure is designed to protect against windblown dust

non-conductive mounting surface for internal components

when mounted horizontally

Lochinvar & A.O. Smith 100167824 Control Board 323055-751 the Robertshaw 5300-029 Electric ThermostatThe Lochinvar & A. O. Smith 100167824 Control Board is a critical integrated component designed for high efficiency Knight XL heating boilers, specifically the KBN501 series. As a direct replacement for the obsolete RLY30066, this OEM control board manages essential system parameters including hot surface ignition, flame sensing, and temperature regulation. It ensures precise HVAC system timing and safety protocols by monitoring the air pressure