Truma boiler safety/drainage valve - is there a workaround?

Discussion in 'Tech/Mech General' started by veevee, Jan 14, 2016.

  1. veevee

    veevee Funster

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    Hymer B680 SL 2006 with a Trumatic C boiler eqiped with a safety/drainage valve.

    Our boiler emptied at between + 8 / 9 oC internal temperature. I was testing for a leak in the water system and found the water tank empty today. The manual does state that at 8 oC it will empty the boiler and I guess it has syphoned the water from the tank too.
    This temperature to dump water is too high for me, we like mountains and can find sub 8 oC all year round in the Pyrenees and Alps. Is there a good work-around to either control this manually through an electrical switch or in-line tap or is there a lower temperature valve I could install?

    Is the thermostat for the dump valve in the valve housing or part of the boiler controls?

    Thanks for any help, what a waste of 120 ltr of water.
     
  2. sdc77

    sdc77 Funster

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    I know you can put a peg on to stop it. Ours is manual though so we don't have that problem. I suppose you could change to a manual one.




    .... just as an explanation. .. we use our van all year round .. its always got water in it and when not in use over winter it has heating on or an oil rad on.
     
    Last edited: Jan 14, 2016
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  3. GJH

    GJH Funster Life Member

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    I believe that the thermostat for the dump valve is in the valve housing. Our heater (Trumatic C3402 with the red automatic valve) dumps at 4 deg C but the valve can only be closed once the temperature reaches 8 deg C. If we suspect that the temperature is going to drop we simply turn the heater (Trumatic C3402) on (as per the manual). The dump valve does not operate if the heater is switched on and it uses very little gas. That is the designed-in way to stop the valve operating whereas a peg leaves the heater unit vulnerable to (expensive) damage.
     
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