if your unit is failing to ignite the main burner or the pilot flame is weak/non-existent

and the piston assembly

the A30 series typically includes a break-off shaft

Optimized RPM: Factory-set at 1050 RPM to match original equipment airflow design requirements

Siemens Building Technology 599-02054 Valve 323269-701 if your unit is failingThe Siemens 599 02054 is a 1 2 inch NPT x Union Male 2 way normally open globe valve designed for precision control in HVAC terminal unit applications. Featuring a 1. 6 Cv rating and an equal percentage flow characteristic, this valve ensures linear control of hot or chilled water and up to 50% glycol solutions. The forged brass body is paired with stainless steel trim, providing enhanced durability and resistance to scaling compared to standard brass