Danesmoor 26/32 oil boiler lockout problems

Discussion in 'Plumbing and Central Heating' started by rsparker1980, 2 Dec 2011.

  1. rsparker1980

    rsparker1980

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    Lockout problem with a Danesmoor 26/32 boiler.
    Electro Oil 11d burner with satronic control box.T830b
    The burner has had a new nozzle and photocell replaced.
    Boiler fires, with flame then goes off. When the control box is reset the process to lockout takes 30 seconds every time. Was suspecting a fault with the satronic control box.

    Customer claims boiler began to lockout after delivery of oil. Pump pressure is stable at 120 during process. Filter at tank, pump filter have been cleaned & nozzle has been changed after delivery.

    Fire valve is the wheel/gate headed type - not a fusible link.

    Flue balanced square type directly to outside.

    I appreciate any suggestions.
     
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  3. Boilerman2

    Boilerman2

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    Firstly lets try and work out what is happening, are you saying the burner purges, fires up but will only run for about 30 seconds before Locking out?
    that is my understanding of your post, but perhaps you could confirm?

    Secondly you have not got a Fire Valve, you have a gate valve which will not shut down the fuel in event of fire - you should strongly recommend that a Remote acting fire Valve be fitted with the valve outside of the property, with the phial inside the boiler case. ;)
     
  4. dcawkwell

    dcawkwell

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    If it has fired but goes out.
    Typical solenoid and or solenoid valve fault.
     
  5. rsparker1980

    rsparker1980

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    thanks for your prompt replies.

    that's correct burner purges, fires up but will only run for 30 seconds before locking out.

    the fire valve is an old style wheel head fire valve. i have explained to the guy the requirements for a remote type to be fitted externally.

    with regards the solenoid coil, i have removed from oil pump and am getting magnetism onto a screwdriver. have also replaced coil with one from spares.
     
  6. dcawkwell

    dcawkwell

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    Then it would appear to be the solenoid valve causing the problem
    if you have already replaced solenoid coil.
     
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  8. rsparker1980

    rsparker1980

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    thanks again for your reply. would this mean just replacing the armature/stem on the pump. is this a commen fault?
     
  9. dcawkwell

    dcawkwell

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    Yes. I usually go in there and just replace both. Saves messing with it.
    Both are fairly cheap so quickest fix for customer.
     
  10. rsparker1980

    rsparker1980

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    thanks alot for your reply. any ideas what causes these to fail. will try that asap
     
  11. Boilerman2

    Boilerman2

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    The Cost of a Coil and a stem is greater than a complete oil pump !
    it is not cost effective to change both components.

    I suspect the cause may be other than the oil pump or solenoid

    Have you investigated the possiblitiy of false light (the PE cell seeing light before the solenoid opens,) you may have a bright ign spark or some tracking of the HT cables, try turning the photocell through 90' in it's holder, you may find that the burner now runs

    Also how stable is the flame while it is alight, if you have an unstable flame the burner wioll lock out (you should be able to hear if the flame is a bit loose! ;)
     
  12. rsparker1980

    rsparker1980

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    thank you both for your advice. I have just spoke to the customer regarding the suggestions you have made. He feels that i have tried enough remedies already and no longer requires my services. i have visited him twice, once to look at the job and check pump pressures, coil operation, clean filters etc. And a second time to change nozzle & photocell. He is worried about the cost implications !??!

    That means i cant put your words of wisdom into practice, which is very frustrating as i would have enjoyed remedying the problem. Thanks anyway and hope to get advice in the future.
     
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