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Has anyone had this Federal Boiler Airscoop

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Joseph_4
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
thanks
Joe


Comments

  • mattmia2
    mattmia2 Member Posts: 9,850
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    What happens to the pressure gauge as this is happening? What is the precharge in the expansion tank?
  • HVACNUT
    HVACNUT Member Posts: 5,876
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    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?
    mattmia2