Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Has anyone had this Federal Boiler Airscoop

Joseph_4 Member Posts: 278
I have a customer who I observed myself after one turns boiler. in about 3 minutes i hear popping sounds that the water is flashing to steam and caused the prv to dump water consecutively. Its a new PrV and Expansion tank.. It happens really fast starting from cold start... but not all the time. I rebled all zones and had all zones working fine the last time i worked on it and shut boiler down with boiler switch. The Boiler is a Federal Boiler and It has a square box like air scoop. any ideas what the problem can be. here are some pics


  • mattmia2
    mattmia2 Member Posts: 9,850
    What happens to the pressure gauge as this is happening? What is the precharge in the expansion tank?
    HVACNUT Member Posts: 5,876
    Ahhh, memories. I haven't seen one of those in a long time. 
    You replaced the extrol and relief valve but left the crusty auto vent?
    The pressure only rises when the burner is on? It's not a tankless coil leak?
    Is there an indirect water heater?
    Is the pressure reducing valve working?