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The Maxitrol TD121B Temperature Selector is a critical component for Selectra Series 21 and 31 electronic gas flame modulation systems
As a critical component for commercial HVAC maintenance
optimized to maintain correct head pressure and heat transfer efficiency
Both part numbers refer to the same 24V
Lochinvar & A.O. Smith 100233340 Burner 320788-702 The Maxitrol TD121B Temperature SelectorThe Lochinvar & A. O. Smith 100233340 Burner is a precision engineered main burner assembly designed for high efficiency combustion in commercial and residential hydronic systems. As a critical HVAC replacement part, this OEM gas burner is specifically calibrated for the Lochinvar Knight series and compatible A. O. Smith copper fin boiler models. It features a robust construction capable of managing a wide firing range from 45K to 500K BTU, ensuring