The integral vent limiting orifice acts as a dedicated breather hole
and MK-4821 actuators to VB-9213
This 140-170°F automatic limit control functions as a normally closed (NC) disc-style switch
or Intertherm HVAC unitsùparticularly the CMF2 downflow furnace seriesùthis part is critical for maintaining proper static pressure and exhaust venting
this OEM York furnace part is essential for monitoring the burner assembly and ensuring the control board receives the necessary microamp signal to maintain the heating cycle
Bard 8620-039 Pilot Assembly The integral vent limiting orificeFor contractors maintaining Bard HVACR systems, the Bard 8620 039 Standing Pilot Assembly is your go to direct replacement for the legacy 8554 002 and Honeywell Q314AFB units. This assembly is engineered to ensure consistent, reliable ignition across a range of gas fired appliances, including furnaces, water heaters, and boilers. It's a non primary aerated, target type pilot burner designed for standing pilot applications, crucial for maintaining