meaning it does not require an external power source to generate the 0-10VDC signal

and air conditioning sectors

the external high-voltage ignition cable may need to be reused or sourced separately depending on the boiler model

Improved Efficiency: Restores intended burner performance

Watts R119-04D Regulator 30067439-890 meaning it does not requireThe Watts R119 04D is a high capacity pneumatic pressure regulator engineered for demanding industrial air preparation. Featuring a 1 2" NPT female inlet and outlet, this diaphragm operated regulator is built with a rugged zinc housing and a balanced poppet design to ensure rapid response and pinpoint accuracy across a broad flow spectrum. It handles a maximum inlet pressure of 300 PSIG and provides a precise secondary pressure range of 5 to 250 PSI.