Possible Gas Regulator Problem a dilema

Discussion in 'Motorhome Accessories' started by Stewart J, Feb 19, 2014.

  1. Stewart J

    Stewart J Funster

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    Just back from a week away during which we noticed that gas pressure seems down when using say oven and gas rings, as each is lit jets on others diminish, also Truma fire which we usually set at 2.5 keeps re-igniting in breezy weather, oven seems most affected with very small flame with oven hobs lit?

    We have a 2 x 11kg Alugas refillable system fitted with a Gaslow Auto Changeover valve, van is 11 months old and fitted with a Truma MonoControl CS regulator.

    I'm wondering if the regulator is starting to fail, there is however an odd thing happening with the Gaslow auto changeover indicator in that with one gas cylinder isolated red area is visible indicative of low pressure. If I open up both cylinders red indicator area is more visible. Both gas cylinders are full!

    Very perplexing, I've attached 2 photo's 1st shows the indicator with only 1 cylinder opened and valve selection in manual (for that cylinder) second is both cylinders open and valve selector in auto.

    I'd appreciate your thoughts or advice.
     

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  2. jhorsf

    jhorsf Read Only Funster

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    Sound like one for Dave N to answer
     
  3. pappajohn

    pappajohn Funster Life Member

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    as the auto changeover is before the regulator i would think the fault lies in the changeover valve.

    If the reg was failing and not allowing enough gas through then everything upstream (changeover and bottle taps) should still work ok
     
  4. Stewart J

    Stewart J Funster

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    That has me wondering pappajohn as reg is on the HP side!

    Apologies for error in my original post the auto valve is completely automatic and only has 2 positions giving priority to either RH or LH cylinder as first in line. :Wink:
     
  5. aba

    aba

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    silly one here but are you 100% sure the bottles are full ??

    you could always remove the changeover switch and connect directly to the regulator which would effectively rule out any problems with the switch.
     
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  6. Stewart J

    Stewart J Funster

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    Yes both are full topped up last week.:Eeek:
     
  7. bobandjanie

    bobandjanie Funster Life Member

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    Just a thought have you filled overseas, because unlike over here its not propane, and a mix butane / propane and in summer can be 80% butane and will not gas off in a UK winter. :Doh:

    Bob.
     
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  8. TheBig1

    TheBig1 Funster Life Member

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    simple tests first, turn off one cylinder at a time and see if it makes a difference. then turn fully on as you check the other. when you filled up, did it take much gas before the 80% limit valve cut in

    otherwise my money is on the truma regulator, well known for gumming up and failing. if you replace it use a gok or gasit regulator, much cheaper but more reliable
     
  9. grasscutter

    grasscutter Funster Life Member

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    We had similar symptons. Changed the Truma regulator and problem was sorted.
    Changed to a Gaslow regulator, certainly cheaper than the Truma.
     
  10. dave newell lvs

    dave newell lvs Trader-Vehicle Services

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    It does sound like a failing reg but Aba's suggestion of removing the changeover and connecting one cylinder directly to the reg is the first step to diagnosing the fault.

    D.
     
  11. Stewart J

    Stewart J Funster

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    Thanks Dave I actually have an almost new Gaslow regulator removed from last van and intention.is to change it over with the Trauma unit to see if it helps.
     
  12. pappajohn

    pappajohn Funster Life Member

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    my first thought....but the changeover valve is between bottles and regulator and its the high pressure changeover valve showing the anomoly.
    Even if the reg was completely blocked with crud and allowed no gas through it couldnt affect the changeover valve operation.
     
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  13. RobGriff

    RobGriff Funster

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    Hi Stewart have you checked the pig tails between the regulator and gas bottles has they collaps inside :Smile:
     
  14. Scattycat

    Scattycat Funster

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    I don"t know if this will or is relevant, but

    We have a Duo comfort control that has 2 pigtails to feed 2 13 kg bottles and that is then connected to a Truma secumotion regulator.

    The system suddenly stopped working half way through a bottle of gas.
    I played around with it and found that the gas was passing through the Duo Comfort okay but stopped at the gas regulator ( the Secumotion unit)

    Trying to locate a replacement it turns out that the unit has been updated. One of the main reasons seems to be is that with recent rules on the make up of the gas it seems that the gas draws moisture through the rubber pipes, which have been replaced by upgraded ones that have a steel braid around them which is supposed to stop the problem, but this moisture is what clogs up the gas regulator stopping it allowing the gas to pass through it.
    The new replacement Truma regulator has an added bit to it that is also supposed to eliminate the moisture problem.

    I was a bit sceptical regarding this explanation but on buying the new upgraded regulator we now have all our gas appliances working as they should,( so far touch wood),
     
  15. Stewart J

    Stewart J Funster

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    Was hoping to change regulator out this afternoon but the at times torrential rain put paid to that.:Eeek:
     
  16. TheBig1

    TheBig1 Funster Life Member

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    not quite the correct explanation, but near it

    the nature of liquified petroleum Gas is that it is oily by nature and reacts with the rubber used in standard high pressure pigtails. this allows a buildup of oily residue that gums up the regulator leading to premature failure. the work around is to fit stainless steel pigtails with overbraiding. not the overbraided rubber ones as these too allow the leaching of oily residue

    truma has bought out a trap system that collects the residue before it enters the regulator. this trap isnt required by other manufacturers regulators as they are unaffected by the oily residue and allow it to pass through and its eventually burnt at the appliance end

    we are not talking about a large quantity of residue though, we are talking about a minute percentage of the gas used. its more common with gas sold at the pumps for some reason, but its still a minute amount.

    changing to a new truma regulator will cure the issue temporarily, but if you still have rubber or rubber overbraided hoses, it will eventually gum up the new one

    i hope this explanation is helpful to allow you to better understand the problem. there is a technical bulletin about on the internet that explains the chemical process, but in essence it says the same, but gives the oily gum a chemical name. perhaps one of our resident petrochemical experts will comment
     
  17. pappajohn

    pappajohn Funster Life Member

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    keep us posted before the thread disappears off the board. :thumb:
     
  18. webby1

    webby1 Funster

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    Gas regulator

    We had a similar problem and replaced the regulator no problems since then.

    However we were told (not by Truma) that the reason the Truma reg clogged up was

    because it had a "double filter" and other cheaper regulators only had a single filter and

    would allow all the gunge through NOT to be burnt off as you suggest Big One but likely to

    gum up the internal pipeworks.

    Any other comments of clarifications very welcome.
     
  19. Stewart J

    Stewart J Funster

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    Commanded to attend our gorgeous grand-daughters second birthday today PJ a fifty odd mile drive each way, so perhaps tomorrow I may be allowed to have an experiment, though weather forecast is rather iffy. :Smile::Smile::Smile:
     

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  20. pappajohn

    pappajohn Funster Life Member

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    so pretty.....bet she will break some hearts in the future :Laughing:
     
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