Truma Safety/Drain Valve

[Clickem]

In the process of draining down our new to us Van and find that it is fitted with a Truma Frost Control Valve like this:



Should I be opening this manually or assume that in the event of a build up of pressure it will open itself? The instruction book says that turning the top switch by 180degs and the push button will pop out and drain the boiler. I have been turning the top switch and the button is not coming out

TIA

 

[David and Sally]

Odd. Turning the top valvr 90 deg and it should open the valve. The button on the side will pop out. Your boiler will drain. If you leave it it will drain automatically if the temp drops to near zero.

 

[Lenny HB]

Sounds like it is faulty. Could be a build up of calcium in it. Try taking the valve out and soaking it in a solution of hot 30-40% vinegar and water, white wine vinegar works best.

 

[tuscancouple]

And then you get ready for your next trip after a cold spell, fill up with water, turn 12v on, drive off dumping the whole lot out as you go! We now have a prominent sticker which reminds us to check the valve

Mick

 

[Coolcats]

In the process of draining down our new to us Van and find that it is fitted with a Truma Frost Control Valve like this:



Should I be opening this manually or assume that in the event of a build up of pressure it will open itself? The instruction book says that turning the top switch by 180degs and the push button will pop out and drain the boiler. I have been turning the top switch and the button is not coming out

TIA

You can do either, wait until around 4 degrees and it should open or do it manually when you turn it the button pops out, when re-setting push the button in and turn in the opposite direction.

When draining open the taps and there should also be another small valve just by the Truma one to open as well. But refer to your manual.

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[Clickem]

....
When draining open the taps and there should also be another small valve just by the Truma one to open as well. But refer to your manual.

If you mean the overcentre type drain valve then the manual says that it is one or the other fitted, but not both

 

[Coolcats]

If you mean the overcentre type drain valve then the manual says that it is one or the other fitted, but not both

Thats why its best to refer to your manual, we have two pipes and two valves the frost protection vave drains down the Truma, the other I think helps drain down remaining water, plus of course the main water tank is drained.

 

[Clickem]

I have solved my problem

The button was protruding about 4mm and I was unable to get it to pop out, and have now realised that it was in fact already out. As it warmed up today I have been able to get it to go all the way back in. Been colder than I realised

Thanks to all contributors

 

[Coolcats]

I have solved my problem

The button was protruding about 4mm and I was unable to get it to pop out, and have now realised that it was in fact already out. As it warmed up today I have been able to get it to go all the way back in. Been colder than I realised

Thanks to all contributors

Great news

 

[Bognor Saint]

This is a coincidence. I took my dethleffs in for a small warranty issue today. I also mentioned that I had tried to drain the boiler but no water came out. The technician came out to show me the correct procedure and then discovered that he too could not drain the boiler. Same issue as OP, blue button not popping out. Half hour later new one fitted. Only 5 months old so should not be due to calcium build up.

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[Jaws]

Those automatic things are a right pain..
Crossing the high plains in Spain a good few years ago the autodump did just that.. We had no water when we stopped.
Ripped it out and stuck a manual one in !