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The Maxitrol TD121B Temperature Selector is a critical component for Selectra Series 21 and 31 electronic gas flame modulation systems
Built for wall-mount applications
Flexible Porting: The 1/2" x 3/4" NPT configuration provides versatility for various manifold setups without excessive adapters
which is standard for cooling
Carrier HK42FZ040 Circuit Board 320819-301 The Maxitrol TD121B Temperature SelectorThe Carrier HK42FZ040 furnace control board serves as a critical integrated furnace control (IFC) for high efficiency HVAC systems, acting as the direct functional replacement for the discontinued HK42FZ028 circuit board. Designed to manage the ignition sequence, inducer motor speed, and blower motor timing, this OEM Carrier replacement part ensures precise modulation of furnace gas valves and flame sensing safety circuits. Technicians will find the
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