Van dumping all the water when cold????

nicholsong said:
Like most valves - unless some idiot replaces the handle at 90 degrees.:LOL:
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Yes I've had that in other applications, wondered why a ball vale wouldn't open once when it was already open.....
 
Vanderek said:
has an element to warm the valve if the temperature drops
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I must be missing something here. Isn't the dump valve a safety item to protect the boiler from damage due to freezing?

....and now someone makes a device to keep the valve warm...?!
 
g3cwi said:
I must be missing something here. Isn't the dump valve a safety item to protect the boiler from damage due to freezing?

....and now someone makes a device to keep the valve warm...?!
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It only heats the valve when the boiler it turned on. It's designed for when your dump valve is in a remote position where it can get cold.even when heating is on
 
We wild camp.
Our first couple of trips have been marred by water dumping. So. After getting advice that setting the interior temperature to 16C we ran an experiment last night. The van was set to 25C for three hours then turned down to 16 for the night. I taped a thermometer to the water tank which is about 9" from the valve. This morning after a night of -1C the dump had happened again but the temp on the tank was 9.1C We are thinking this dump valve is going off at too high a temp. Your thoughts please?

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Poly Hive said:
We wild camp.
Our first couple of trips have been marred by water dumping. So. After getting advice that setting the interior temperature to 16C we ran an experiment last night. The van was set to 25C for three hours then turned down to 16 for the night. I taped a thermometer to the water tank which is about 9" from the valve. This morning after a night of -1C the dump had happened again but the temp on the tank was 9.1C We are thinking this dump valve is going off at too high a temp. Your thoughts please?
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Well if the water was still hot in the tank(say 40c) when you went to bed the thermometer taped to it would have been receiving 'conductive' heat from the residual temperature of the water, whereas the valve would not, in the free air, although only 9" away so the temperature there could have dropped down to the opening value of 4C.

Just my theory.

Geoff
 
Miss understanding here. The water tank I am referring to is the potable water tank NOT the boiler which was left on at 60 in fact.

PH
 
Poly Hive said:
Miss understanding here. The water tank I am referring to is the potable water tank NOT the boiler which was left on at 60 in fact.

PH
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Sorry

Never knew anyone had a dump valve on the fresh water tank. We just have a bath plug at the bottom, so assumed tou were taling about the boiler.
 
Poly Hive said:
Miss understanding here. The water tank I am referring to is the potable water tank NOT the boiler which was left on at 60 in fact.

PH
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Yes, but if your hot water tank dumps, it keeps on drawing more water from the freshwater tank until it is empty (as I know soooo well...)

Once you have got to grips with resetting (which took us 3 years, every year it was back to square one until I eventually wrote it down!) then leaving the hot water on 60 should be sufficient I would have thought. But if you haven't reset properly it just keeps dumping...
 
I have to take the vehicle back to the dealer on Thursday so will consult with them.

PH

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Chockswahay said:
Just to make you laugh ..............

https://greywolfy1.blogspot.com/2013/11/sunday-17th-nov-really-cold.html

:D2:D2:D2
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The lessons to be learned from the above link and the operation of the system, is that once the boiler dump valve is open any water in, or being replaced, in the boiler will drain out.

If one wants to refill the fresh water tank which has lost water and refill the boiler, one has to close the dump valve. This can only be done in its normal operation if the temperature is >+8C. But it can be done by holding the dump valve open with a couple of clothes pegs round the shaft or a lanyard secured round the knob.

If the MH temperature is above zero or the boiler is heating there is no danger of freezing the boiler water and causing damage. The dump system is primarily there for when a MH is left unattended, not when it is occupied and warm, when there is no danger to the boiler. If you are in the MH and it is warm just overide the dump valve, as above.

Geoff
 
I have been reading this thread with growing dis-belief, that we can pay 50 grand and (a lot) more for motorhomes that dump their water if the temperature drops to 4 degrees C

If I had purchased one of said motorhomes, I would reject it as not fit for purpose in the UK as temperatures have been known get that low!

Whilst I understand the physics & damage that frozen water can do, surely there must be a solution that doesn't dump all the water & require resetting valves - it is 2019......
 
If there is water in a system, not just the boiler and the temp drops sufficiently to cause freezing then any water that is present will be subject to it and will freeze. The only safe solution is to dump all the water. Obviously this wouldn't be possible if you circumvent the dump valve. I would rather be safe than sorry.
 
TheTwoOfUs said:
If there is water in a system, not just the boiler and the temp drops sufficiently to cause freezing then any water that is present will be subject to it and will freeze. The only safe solution is to dump all the water. Obviously this wouldn't be possible if you circumvent the dump valve. I would rather be safe than sorry.
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I am sure anyone who has had to replace a frozen boiler will agree with you, those dump valves are fitted for a good reason and I don’t have a problem when mine operates.
 
daveandsan said:
I can never understand why folks don’t set their thermostat to around 10 deg when they go to bed to stop any of this happening.
They spend thousands of pounds on a Motorhome but are to tight to use a bit of gas on heating.
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Rude :mad:
 
daveandsan said:
I can never understand why folks don’t set their thermostat to around 10 deg when they go to bed to stop any of this happening.
They spend thousands of pounds on a Motorhome but are to tight to use a bit of gas on heating.
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A few points here........

1. I was offering a light hearted post to let the O.P (and others) know they are not alone in experiencing this.

2. This was our first season with a 'van and we were inexperienced.

3. We don't like to be too warm at night.

4. You don't know me and yet you have the audacity to suggest I am tight.

5. Perhaps you might like to keep snied remarks to yourself!

Rant over.
 
Chockswahay said:
A few points here........

1. I was offering a light hearted post to let the O.P (and others) know they are not alone in experiencing this.

2. This was our first season with a 'van and we were inexperienced.

3. We don't like to be too warm at night.

4. You don't know me and yet you have the audacity to suggest I am tight.

5. Perhaps you might like to keep snied remarks to yourself!

Rant over.
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He wrote 'folks' and 'they' so there was no reference to 'you'
 
My van has manual dump and pipes were frozen last year took hours to thaw them out should of drained system but didn't but wont get caught again - so wish i had auto dump

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I am talking about a Truma set up here. The dealer says that the valve is set for +3C. She gave me a document that says this clearly. However on the 2nd last page of it, there is this piece of kit.
Clipboard01.jpg
The dealer has never fitted one but is on my behalf investigating the price and so on so I will up date as matters proceed However at the moment it seems to be the answer.
 
I fitted one of those to our old van. Took twenty minutes. Fifteen of which were emptying the garage.
 
The thing to learn from this thread is fill the Kettle before you go to bed and then you'll still be able to have a brew in the morning even if you're van has dumped its lot
 
I have the hymer s740 and it keeps dumping all the water when the hot tap goes on , any ideas

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Stirls250 said:
I have the hymer s740 and it keeps dumping all the water when the hot tap goes on , any ideas
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Sorry,none at all. But I am interested as when I went to fill the tank with fresh water this morning for our trip tomorrow,I discovered the dump valve was open. Sharpish frost last night but I thought it was above 4degrees by 10 o’clock. Apparently not so...takes a while for valve to warm up.
Now working ok.
Perhaps yours was still too cold.
 
It's dumping out of the clear overflow pipe
 
Stirls250 said:
I have the hymer s740 and it keeps dumping all the water when the hot tap goes on , any ideas
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It'll be the said frost protection valve has opened.
The boiler will have emptied and sometimes the rest of the fresh tank stays where it is until a tap is opened and it drains through the boiler.
Close the valve and it should stop.
 
Also I have no idea where the dump valve is , sorry newbie
 
@Stirls250 I think you might do better by starting a new thread on here,either under Hymer or Tech/Mech. It would probably get more attention.

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