No not the Truma one it’s temperature sensitive, personally I like the use of a good old fashioned mechanical spring there is something quite re-assuring about it not relying on modern technology. There is a button at the base of the valve push it in and turn the tap if the temperature is to low the switch doesn’t stay in position. Once the Temperature rises just push the button turn the valve and you hear it click in to position.
Thanks. That all makes sense. But still not sure why the dump happened seconds after switching on the 12V. If it's temperature sensitive, and I'm not doubting you, it should have happened during the night before.
It's a thought, but there was way too much water emptying out. The boiler would have never refilled so quickly.
Hard to remember the exact sequence of events. Pretty sure it just poured out and stopped by itself. Not ruling out what you say though.
Mine looks like the one in the video previously linked. No visible power connections.
It's in storage, not being used.
Yup. It was more the next time I was worrying about. I'm starting to lean more to the theory that several of you clever buggers have suggested. The valve had already opened, and me switching on the 12V just started the pump trying to refill the boiler. Nothing else it can be really is there? Other than my bizarre theory about the valve being stuck and me freeing it up by jumping in the van. No takers for that one?
Whether or not the dump valve is electrically powered and the dump valve has opened and you've also drained the water tank and piping there's no need to leave the 12v on as there won't be any water to freeze.
Perhaps you could test that theory by not eating so many pies?Other than my bizarre theory about the valve being stuck and me freeing it up by jumping in the van. No takers for that one?
Anything is possible, I have a saying I often use which is 'If it wont work hit it with a hammer' I will add a new saying to my tool kit of life 'if the valve is stuck jump about in the van'
The problem when you get caught out, in the last week we have had days at 11° followed by the next day at 4° with an overnight below zero, which is not very normal on the south coast, that get that much variation day to day.
Drain it, let it dump. What's the difference? You still have to refill either way. I use the van regularly throughout the year, so I don't want to keep refilling unless I have to.
Agree. I always switch off the 12V when the van is in storage. But this was the first time the dump valve had operated and it threw me that water started pouring out when I switched on the 12V. As others have pointed out, almost certainly the pump pushing water through once it was re-activated.
I was referring to someone who was putting it in storage. If you are prepping a car for long term storage it make sense to empty the water as part of your storage prep. What if you left water in it and for some reason it got to freezing and didn't dump?
On our Weinsberg,next to the dump valve (the type shown in video) there is a short cord which when pulled activates the “heating” : it opens a duct from the truma warm air system. So as long as you have the heating on low warm air is circulated around the valve keeping the temperature above the critical dump temp.
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