The Packard PM12440 is a heavy-duty 120V to 24V step-down transformer engineered for reliable performance in residential and commercial HVAC control circuits

you can typically use a contactor with a higher FLA rating as long as the coil voltage (208-230V) and physical dimensions match

What happens if I use the wrong MFD rating

Direct OEM Fit: Guaranteed compatibility with Rheem-Ruud gas valves

Reznor 63003 Orifice The Packard PM12440 is aMaintain precise manifold pressure and combustion efficiency with the Reznor 63003 Burner Orifice, a critical OEM component engineered for specific gas fired unit heaters. This 1. 20 mm brass orifice plug is manufactured to strict tolerances to ensure a consistent fuel to air ratio, preventing the common issues of soot accumulation or delayed ignition in propane (LP) gas conversion applications. Designed specifically for compatibility with Reznor F 50