Truma frost dump valve

[Tombola]

I've brought the MH to Wales but am staying in my static tonight.
The forcast is possibly freezing tonight, If I leave the heating on say 7 degrees in the van, will that be enough prevent the front valve from emptying.?

The pump and valve are in the double floor.

I want to leave it as low as poss as I can't get it hooked up to ehu easily, so will leave it on gas.

Thanks
John

 

[Jwats]

The frost control triggers at 4 degrees ambient last time I read the manual so should be fine at 7

 

[Two on Tour]

I've brought the MH to Wales but am staying in my static tonight.
The forcast is possibly freezing tonight, If I leave the heating on say 7 degrees in the van, will that be enough prevent the front valve from emptying.?

The pump and valve are in the double floor.

I want to leave it as low as poss as I can't get it hooked up to ehu easily, so will leave it on gas.

Thanks
John

Can you leave access open to the double floor for the heat from the hab area to reach the dump valve ?

 

[Tombola]

Can you leave access open to the double floor for the heat from the hab area to reach the dump valve ?

Good point . There is a hatch right above it....done ! Thanks
..

 

[Figaro]

If the Truma has been on and you have a tank full of hot water I think that'll be sufficient to keep the area warm enough to stop the frost valve opening

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[MisterB]

Why not wrap a tea towel around the dump valve to insulate it??

 

[Googlebot]

Why not wrap a tea towel around the dump valve to insulate it??

I wouldn’t, I would sooner lose a tank of water than the heater. If for any reason the temperature drops below freezing or the heating fails, you want it to work.

 

[Landy Andy]

You won’t loose a tank of water if you turn the pump off, you will just loose the boiler’s contents.

 

[Minxy]

I wouldn’t, I would sooner lose a tank of water than the heater. If for any reason the temperature drops below freezing or the heating fails, you want it to work.

A single night at the stated temperature isn't going to affect the boiler. Ours is a bit over sensitive so I have a cable tie and wedge holding the button in otherwise it dumps well above the minimum temp, obviously it's not left like that once home and unused but we always drain down fully when we get back from trips.

 

[Tombola]

Left the heating on 7, all.was well.
In fact I don't think the heating even came on as temps didn't drop as expected.

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[Googlebot]

A single night at the stated temperature isn't going to affect the boiler. Ours is a bit over sensitive so I have a cable tie and wedge holding the button in otherwise it dumps well above the minimum temp, obviously it's not left like that once home and unused but we always drain down fully when we get back from trips.

You are right, it probably won’t.

I am a natural worrier, water is cheap, Truma boilers aren’t!

I would say change the frost valve, but they aren’t cheap either. :-(

 

[Pausim]

You won’t loose a tank of water if you turn the pump off, you will just loose the boiler’s contents.

On one of my motorhomes the frost valve opened and siphoned the water from the tank as well as the boiler. Might have had something to do with the type of pump and the plumbing, it was a submersible pump.

 

[Landy Andy]

On one of my motorhomes the frost valve opened and siphoned the water from the tank as well as the boiler. Might have had something to do with the type of pump and the plumbing, it was a submersible pump.

It should take air in at the boiler top to stop this. It’s an elbow with water pipe attached, connected to boiler with a small bore flexible pipe running to outside your van. Potentially this has stuck closed.

 

[Pausim]

It should take air in at the boiler top to stop this. It’s an elbow with water pipe attached, connected to boiler with a small bore flexible pipe running to outside your van. Potentially this has stuck closed.

Perhaps that is what happened, it was several motorhomes ago.

 

[Lenny HB]

You won’t loose a tank of water if you turn the pump off, you will just loose the boiler’s contents.

You will if the tank is higher than the dump valve, our first van the tank was under the lounge seat and we lost a tankful that way. All subsequent vans the tank has been lower so only emptied the boiler.

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[VWDrooper]

My PVC used to dump all the water as well as the boiler contents and you were unable to refill with fresh water until the ambient temperature had been raised enough to allow the frost valve button to be pushed back in