Direct OEM Compatibility: Specifically engineered for McDonnell & Miller 63 Series units

Silicone Disc Seat: Offers superior high heat resistance and durability against chemical exposure compared to standard EPDM components

If those check out with a manometer

The Johnson Controls TE-6363P-1 is a professional-grade outdoor air temperature sensor designed for precise ambient monitoring in commercial HVAC systems

You can also check the coil resistance with an ohmmeter

Reznor 269853 Conversion Kit 30067439-890 Direct OEM Compatibility: Specifically engineeredWhen transitioning a Reznor unit heater from propane to natural gas, the Reznor 269853 conversion kit provides the necessary hardware for a field ready fuel swap. This gas conversion kit is specifically engineered for Reznor UDAP, UDAS, UDBP, and UDBS models in 100 and 125 sizes, ensuring the manifold pressure and thermal output align with factory benchmarks. The 100% genuine Reznor 269853 package includes precisely sized burner orifices and the