How do you stop truma dump valve from opening in cold (1 Viewer)

Dec 10, 2022
1
0
Funster No
92,833
MH
hobby toskana 650
Have a 2012 hobby Toscana 650. Found it has the usual truma dump valve prob. How do I stop from dumping water in minus deg so I can fill tank
 
Feb 22, 2011
9,163
17,941
Newcastle under Lyme
Funster No
15,397
MH
Hymer B544 A Class
Exp
Since 2015
You can put a clothes peg on it (some types of valve, probably not Ditcha type ?) but thats not recommended.
If the boiler freezes with water in it's a very costly replacement.
It won't open if the van is in use and boiler on for hot water or heating, and if its not being used just let it open then reset when it is in use.
Always do a full drain down of everything if not in use over the winter
BTW w2f
 
Last edited:
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Dec 31, 2010
2,497
5,459
Sunny South Shields
Funster No
14,797
MH
Malibu i500 A Class
Exp
Since 2010
Have a 2012 hobby Toscana 650. Found it has the usual truma dump valve prob. How do I stop from dumping water in minus deg so I can fill tank
I made a little bracket with a screw so I can keep button in or have it working normally

IMG_20210428_133048.jpg


IMG_20210428_133019.jpg
 
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WESTY66

LIFE MEMBER
Jun 17, 2017
5,213
11,822
South Yorkshire
Funster No
49,064
MH
Carthago Chic C-Line
Exp
All the gear, and no idea!
I made a little bracket with a screw so I can keep button in or have it working normally

View attachment 695973

View attachment 695972
That’s brilliant!!!
Frost comes, button pops out forcing screw into toaster elements, which then short out, burst into flames and puts the button back in with the heat!!
Absolutely brilliant!!🤣🤣🤣

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slowcoach65

Free Member
Jan 23, 2020
90
137
Funster No
68,276
MH
A
You can get a heating element for the dump valve to make it think it is warmer than it actually is....https://www.motorhomefun.co.uk/forum/threads/truma-frost-control-element.252192/
 
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Dec 31, 2010
2,497
5,459
Sunny South Shields
Funster No
14,797
MH
Malibu i500 A Class
Exp
Since 2010
Do you keep it nice and toasty? :rofl:
That’s brilliant!!!
Frost comes, button pops out forcing screw into toaster elements, which then short out, burst into flames and puts the button back in with the heat!!
Absolutely brilliant!!🤣🤣🤣
Now now boys the toaster was the mk1 method to keep the valve closed keeping it on low but what with the price of electricity I had to come up with something else.
 
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Jan 22, 2020
2,859
4,460
North Somerset
Funster No
68,245
MH
No longer own one
Exp
September 2020
Would a mini hot water bottle do the trick? We’ve got one that takes about 500 mil of water so could just rest it next to the valve.🤔
 
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Jan 22, 2020
2,859
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North Somerset
Funster No
68,245
MH
No longer own one
Exp
September 2020
Just why ?
The frost valve won't open if the the vans in use and if it's not in use your hot water bottle will only be effective until it gone cold, about half an hour 🤷‍♂️

Yep. But when sleeping in the van (away in it for 5 nights over Christmas) we like fresh air with roof vents open. Even during this cold weather in the house we’ve got two windows open as we like lots of fresh air.

I’m guessing there’s potential for it to drop pretty cold, in the van, this time of year.🤷‍♂️

Strange maybe, but that’s how we sleep.🤷‍♂️

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2x2camper

Free Member
Oct 22, 2018
851
2,000
Funster No
56,871
MH
.
You must be very hardy, lol.
If you have the boiler on for hot water in the evening, I'm sure the residual heat would be enough to keep the valve from opening overnight
We've had the dump value open during the night even though we have gone to bed with the water at its highest temperature. Heating and water were turned off overnight.
 
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JockandRita

LIFE MEMBER
Aug 2, 2007
11,174
139,554
Lincs/Cambs border
Funster No
49
MH
N+B Flair 8000i
Exp
Since May 05 (Ex Tuggers).
How do I stop from dumping water in minus deg so I can fill tank
Heating on, but thermostat turned right down, which leaves power to the dump valve without heating the MH......................for those hardy souls amongst you. I'm obviously not one of them ,especially in these current temperatures. ;)

Cheers,

Jock. :)
 
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Jan 22, 2020
2,859
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North Somerset
Funster No
68,245
MH
No longer own one
Exp
September 2020
Heating on, but thermostat turned right down, which leaves power to the dump valve without heating the MH......................for those hardy souls amongst you. I'm obviously not one of them ,especially in these current temperatures. ;)

Cheers,

Jock. :)

Power to the dump valve? Don’t think there is power to mine.🤷‍♂️

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Jan 22, 2020
2,859
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No longer own one
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September 2020
Strange, I thought they were powered permanently, whether your 12 volts was turned on or not ?

It does say currentless…..🤷‍♂️

A. FrostControl

(Safety/drain valve with integral frost protection

FrostControl is a currentless safety/drain valve. When there is a danger of frost, it automatically drains the contents of the boiler through a drainage socket. If excessive pressure is present in the system, pressure will be automatically intermittently equalized through the pressure relief valve.



Screen%20Shot%202015-11-30%20at%2023.16.58.png






Figure 3

a = rotary switch position “On”

b = pushbutton position “Closed”

c = pushbutton position “Drain”

d = drainage socket (led outside through floor of vehicle)



Opening the safety/drain valve

– Turn the rotary switch by 180° until it engages, whereby the

pushbutton pops out (position c). The water from the boiler

drains through the drainage socket (d).

The FrostControl drainage socket (d) must be free of contamination

(slush, ice, leaves, etc.) at all times so the water can

drain out easily! No claims may be made under the warranty

for damage caused by frost.

Closing the safety/drain valve

– Check whether the rotary switch is set to “On” (position a),

i.e. parallel to the water connection and engaged.

– Close the safety/drain valve by pressing the pushbutton.

The pushbutton must engage in position (b) “closed”.

Only when the temperature at the safety/drain valve is above

approx. 7 °C can it be closed manually with the pushbutton

(position b) and the boiler filled.

Truma supplies a heating element (part no. 70070-01) as an

accessory, which is inserted into the FrostControl and fixed

in place with a retaining bracket. This heating element heats

the FrostControl to approx. 10 °C when the Combi is switched

on.This means that the boiler can be filled sooner, irrespective

of the temperature in the installation compartment.

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Jan 1, 2014
526
1,106
France
Funster No
29,512
MH
Pilote G691 LCE
Exp
Since 1974
For the Truma type there are two, the older ones were electrically controlled / operated and could be held closed with a clothes peg or similar, the newer ones have no electrics and are not so easily kept closed.
 
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Feb 16, 2020
1,872
2,603
KT15.
Funster No
68,772
MH
Sunlight. T66. 2019.
Exp
Absolute beginners.
@Ditchas mechanical device is a brilliant answer to the problem for the newer mechanical dump valve, for my part though, I'd just be nervous about creating myself another, more expensive problem. 🤷‍♂️
Mike.

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Aug 19, 2013
2,760
3,784
Wells, Somerset
Funster No
27,611
MH
Elddis 115
Exp
since 2004
So, the mechanical valve is fitted on the water outlet as an option, so this must mean you can retro fit one if not already installed? My previous van had this option, new one hasn't.
 
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Oct 4, 2019
368
492
Milford on Sea
Funster No
64,934
MH
Globecar Campscout
Exp
Since 2005
Yep. But when sleeping in the van (away in it for 5 nights over Christmas) we like fresh air with roof vents open. Even during this cold weather in the house we’ve got two windows open as we like lots of fresh air.

I’m guessing there’s potential for it to drop pretty cold, in the van, this time of year.🤷‍♂️

Strange maybe, but that’s how we sleep.🤷‍♂️
I was a sapper too but now I've retired I've stopped sleeping in the cold. Others may not know what we're talking about. Sorry but can't help with the Truma problem because it's going to snap open if it's not in use. Not sure that holding the button in is the best idea since if water does freeze in the tank it will probably be damaged. Ring Truma and ask them as their technical guys are very helpful.
 
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Jan 10, 2020
38
10
Droitwich, UK
Funster No
67,909
MH
Pilote P720
Exp
Since 2015
My dump valve went tits up, so I replaced it with a manual drain valve. But, I religiously empty all my water after returning from a trip or if away in the winter and the forecast is below 5 degs, I will leave the water heater on low or the heating on, set low, better safe than sorry.

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Lenny HB

LIFE MEMBER
Oct 18, 2007
50,270
138,835
On the coast in West Sussex
Funster No
658
MH
Hymer B678 DL
Exp
Since 2008 & many years tugging
So, the mechanical valve is fitted on the water outlet as an option, so this must mean you can retro fit one if not already installed? My previous van had this option, new one hasn't.
Continental vans it's a standard fitting UK vans it's optional.
You should be able to just replace the manual dump valve,, if there is a non return valve in line with the boiler it needs to be on the boiler side of the valve.

1670758292433.png
 
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Jan 22, 2020
2,859
4,460
North Somerset
Funster No
68,245
MH
No longer own one
Exp
September 2020
My dump valve went tits up, so I replaced it with a manual drain valve. But, I religiously empty all my water after returning from a trip or if away in the winter and the forecast is below 5 degs, I will leave the water heater on low or the heating on, set low, better safe than sorry.

Once we’re parked up, the heating will be left on low all the time, during the day.👍
 
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Feb 22, 2014
2,107
10,269
Grantham
Funster No
30,233
MH
Rapido Le Randonneur
Exp
Since 2015
Just why ?
The frost valve won't open if the the vans in use and if it's not in use your hot water bottle will only be effective until it gone cold, about half an hour 🤷‍♂️
We had this happen when we drove to Helmsley for a couple of nights on the Aire they used to provide. We went fully loaded knowing there were no facilities. Parked was setting up the heating and hot water, turning on the gas and filling the kettle. Heard this pouring water noise and so got out and checked round the van to find water pouring out. We lost half the tank thanks to the damn dump valve. After that we used a paper clip to keep the valve from operating when out and about! Worked perfectly. Always removed it when back home and parked up. Always drained down the system too.
 
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