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Oil Safety Valve Operation

BrooklynMike
BrooklynMike Member Posts: 44
in Oil Heating

I have a Carlin oil burner, an indoor 275 gallon tank with a bottom feed line through an OSV valve and oil filter. Whenever I turn off power to the oil burner to service it or during oil tank filling, the burner cycles several times before firing steadily. The oil line is 3/8 copper and runs along the basement floor up to the oil burner through a firematic valve. I know the OSV valve needs a vacuum to open and allow oil to flow to the burner. When I turn off the burner, do I loose the vacuum in the oil line ? Is there an air leak in the oil line tubing? Is there an oil pump problem? Again, only see this problem after turning off the burner. During normal burner cycling for heating or DHW (tankless coil) , the burner fires normally. Your thoughts?

Comments

  • HydronicMike
    HydronicMike Member Posts: 41
    edited May 23

    You need to properly bleed, power purge the oil line after changing filter and pump strainer.
    There’s a guy on here that would always talk about how to do this (haven’t seen him on here much lately).
    edit: steveusapa

    Here’s a link to the thread that contains a link to power vacuum bleed

    https://forum.heatinghelp.com/discussion/comment/1588887#Comment_1588887
  • BrooklynMike
    BrooklynMike Member Posts: 44

    To be clear, I have this burner cycling problem when I just turn power off and on to boiler/burner. I am not opening any filters or oil lines to let air in. Thanks

  • HydronicMike
    HydronicMike Member Posts: 41

    To me that would point to a vacuum leak first, and a proper check of the fuel unit with pressure and vacuum gauges.
    I would still do that power purge as described above

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 17,872

    Is the primary control one that lets the burner recycle on a flame out? Check you cad cell Ohms.

  • BrooklynMike
    BrooklynMike Member Posts: 44

    EBEBRATT-ed.

    Yes, the primary controller has a pre- purge fire and test, and post -purge cycle that continues to cycle without needing to press the rest button. As the burner cycles. you get one or two momentary puffs of flames and then continuous firing . The burner has a solenoid valve on the oil nozzle that opens to allow for a short burst of oil and if the CAD cell see the flame, then the oil flow will continue otherwise the solenoid closes and no oil flows. Spoke with the a Carlin Tech Rep and he thinks the OSV maybe failing; also he thinks that when the oil burner shuts off, it does not maintain a vacuum in the fuel line. I have a vacuum gauge that came with a Gerber spin on filter from a previous home burner boiler setup. I will try to connect this between the oil burner input the OSV output . Not sure what I should see. I have a push pull hand pump and have already cleaned out the supply line. The oil line is the old style bare copper tube which I would like to replace with the newer style protected copper line. Only need about 20' but only see 50' rolls .

    Thanks

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