Boiler Draindown Valve

[NorthenMotorhome]

So I've recently bought a Mooveo C6 (thanks for all the previous advice on the weight) so far really pleased with it. I've now taken the plunge and paid my Motorhome Fun Subs!

I was pottering in it on the drive familiarising myself with everything, and whilst looking I can not find a boiler drain down valve anywhere. It's a Truma Combi 4 (the gas only version).

I've had a good look round the boiler and round the pump (a fairly standard Shuriflo one) and its no where to be found, am I right in thinking it should be down stream of the pump. Even then I still can't find one.

The booklet suggests it should an automatic Truma one, but there no sign of that or a standard manual one.

Has anyone got any left field suggestions of where I might find it?

 

[royandsharont]

My Adria Twin PVC has it between the fresh tank and the mix fuel boiler and it is in a small box area under the floor that you lift up. With the carpets down you would never see it. It’s one of those fancy automatic temp drop ones.

On my old van it was a simple yellow manual lever switch adjacent the boiler under the side bench.

 

[rb62]

Best thing to do is to have a look under the van to see if there are any short lengths of pipe sticking down then you'll know where to look inside.

 

[Pausim]

You are probably looking for something that looks like these, in a locker, in a cupboard, under the floor or behind a removable panel.

 

[Van Aert]

Not sure if this link works but quite useful.

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[IRHP]

They are usually on the floor next to the boiler.

 

[Landy Andy]

They will be on the hot water pipework, so will be between boiler, and a tap. On my Adria it is on floor under kitchen sink.

 

[NorthenMotorhome]

Hi all thanks for the reply’s. I know what I’m looking for with regards to the two sorts of valves it could be, the automatic Truma style one, Usually in blue, and the manual basic one usually with the Yellow handle.

Still no luck at all, the van is fully carpeted so I’m all out of luck if it’s under a hatch,
How ever looking under the van there no area that I think there would be a hatch.

Underneath there are 4 rubber hoses. One is a larger one running from the fresh Water

Next one traced back inside is a thin plastic one that tee’s off the hot water pipe out of the boiler. From home plumbing I assume that’s a blow out or over pressure outlet.

There’s one that spears to be under the toilet. Or coming from the cassette locker.

And a final one that is under the boiler. Which I can’t find the top of but assume that might be an air intake maybe for the Truma???

Is it possible someone’s replaced the pump but has then failed to re install the valve?

I’d assumed it would be on the cold loop with that being the lowest point in the boiler. The hot water off take is at the top.

 

[NorthenMotorhome]

They will be on the hot water pipework, so will be between boiler, and a tap. On my Adria it is on floor under kitchen sink.

I’m having a look along the hot water loop now

 

[Landy Andy]

Interesting you say two near boiler. One will be air vent and the other is possibly the frost valve. The pipe is 10 to 15mm sort of size.

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[NorthenMotorhome]

One is certainly the vent from the top of the hot water outlet.

The other just doesn’t reappear in the van anywhere, it’s infuriating!

 

[IRHP]

You'll find it eventually. Wait till its below freezing, the valve will trip whether there's water in it or not, next day turn the pump on and wait for water to flow out under the van.

 

[daveandsan]

They are usually on the floor next to the boiler.

My dump valve is nowhere near the boiler, it’s next to the water pump.

 

[Daniel. M]

Might look like this, if it's an older motorhome

 

[NorthenMotorhome]

Still nothing, I’ll get some pictures later on today.

The hunt Continues!

I’ve seen the cost of a new valve if needed, I’d just rather avoid any extra holes on the van if for some reason there was one there and it’s not been put back in.

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[hja]

Ours, the blue one, is near the pump, but because it is tucked under one of the corrugated heater tubes it took ages to find and I have to stand on my head to get to it. We have a separate floor hatch where lots of pipes run with a red handle that flips up to drain those pipes.

 

[Landy Andy]

It will be there

 

[IRHP]

My dump valve is nowhere near the boiler, it’s next to the water pump.

That's why I said usually.

 

[NorthenMotorhome]

Ok so the mystery continues.

I’ve gone underneath, found the two bits of pipe near the boiler. I know one is the vent, so I’ve taken a measurement from that to the other one.

I’ve gone back in the van and translated that measurement from where the vent pipe goes in and found this.

What was clearly a drain down valve that’s been removed……

 

[NorthenMotorhome]

That length of copper, which I’d assumed was gas with a slip of blue rubber round it to stop it rubbing. Is actually the water pipe with a Nice chopped out section Where the valve should be.

I knew I wasn’t going mad.

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[donkey]

It was conspicuous by its absence

Geoff

 

[Chod Jacqui]

So your next job is to fit a dump valve, best to drain system till you've done this unless you are going to be using van. If a threat of frost switch heating on low to protect the boiler.

 

[Lenny HB]

That length of copper, which I’d assumed was gas with a slip of blue rubber round it to stop it rubbing. Is actually the water pipe with a Nice chopped out section Where the valve should be.

I knew I wasn’t going mad.

There must be another tap somewhere or the boiler will be permanently drained.

 

[Landy Andy]

It would appear that someone decided to remove the frost valve and just put a piece of copper pipe in to bypass it.

 

[Pennee]

Sounds like the same clever person who removed the pipe off mine so it drained into the van every time.

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[NorthenMotorhome]

There must be another tap somewhere or the boiler will be permanently drained.

The copper connects the water pipe where valve was, there’s no disconnect in the system. Tank to Pump to Boiler.

There just not a drain point in the system.

 

[NorthenMotorhome]

So do people recommend a manual valve or the Truma automatic one?

Looks like £35 vs £145 ish

 

[donkey]

I have never had an automatic valve and have never had an issue with a manual valve.

Geoff

 

[Lenny HB]

Automatic one can save your boiler in a cold snap which is £1500.
Depends where you live, on the south coast probably worth the risk of a manual. By your username I think you would be better with an auto one.