Refilling Truma - is this normal?
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Motorhome Facts -> Newcomers

Author: Rosbotham

Location: Lancashire

PostPosted: Thu Mar 19, 2009 9:18 pm    Post subject:  Refilling Truma - is this normal?

I always drain down the water tank on our motorhome, but for the last couple of times I've gone the extra step and drained off the Truma water heater as well. No problems draining down, just flip the lever to vertical. It's refilling that's worrying me.

The first time, when I filled the coldwater tank then (a few hours later, never thought to do it at the time) turned on the hot taps to pull through to/prime the Truma, I got loads of water coming out the dump pipe, panicked, changed the setting of the tap such that I lost track of what position it was originally in. Suffice to say I got it working, but at the expense of losing a whole tank of water in the process.

Tonight I was more "measured". After filling the cold tank I made absolutely sure the dump valve on the Truma was in the closed position, then turned on the hot taps. I did eventually get the water through & system primed, but while it was spluttering through clearing the air, it again dumped a considerable amount (maybe 10 litres?) of water out onto the ground under the van.

Is this normal?

(Habitation service is due in a month or two, so if not normal I'll get it checked out then)

Author: safariboy PostPosted: Thu Mar 19, 2009 9:34 pm    Post subject:  

This is not normal. You should always empty the Truma in winter because it is easy to damage it if it freezes and that is not covered by the guarantee.
It should not leak from the dump valve when filling. With electric dump valves there can be a problem if it is cold or if the electricity is off.. You certainly get a lot of spluttering as the pump gets rid of the air. It is important that this purging of air is done before you turn on any heating.

Hope that they can sort it at the service.

Safariboy

Author: wilse

Location: up north

PostPosted: Thu Mar 19, 2009 9:36 pm    Post subject:  

Hi there

Might be a good idea to let us all know what Truma you have.

On our C6002EH when the boiler has drained I refill the water tank, and turn the hot tap on to expel the air as you do. Providing the red drain valve is in the 'up' position no water will drain under the truck.

If the red valve is down, then slowly the boiler will drain.

Not sure if this will help you or not?

Wilse

Author: Rosbotham

Location: Lancashire

PostPosted: Thu Mar 19, 2009 10:23 pm    Post subject:  

wilse wrote:
Hi there

Might be a good idea to let us all know what Truma you have.

On our C6002EH when the boiler has drained I refill the water tank, and turn the hot tap on to expel the air as you do. Providing the red drain valve is in the 'up' position no water will drain under the truck.

If the red valve is down, then slowly the boiler will drain.


Now there you're asking a question. There's nothing of any info on the boiler itself. The manual I have says it's a Truma Rapidstore, but the warning labels on the back of the wardrobe (it's under the floor of that) say Truma Ultrastore.

On mine, if the tap is vertical it's drain, horizontal (choice of two directions) it's closed...according to the manual.

Have only ever run it off mains power. Once the dramatics of dumping the water and priming are done, it seems to be working fine in terms of heating water.

Author: Zebedee

Location: Worcestershire

PostPosted: Fri Mar 20, 2009 7:12 am    Post subject:  

Are you sure it dumped the water during the priming process (which takes ages and makes you think something is wrong until you get used to it!)

I ask because it's ever so easy to overfill the water tank so that the overflow dumps the excess water under the van. It might have been this that you saw the second time (when the dump valve was definitely closed) and thought it was dumped during, and as a result of the priming process.

Hope this helps

Dave

Author: Rosbotham

Location: Lancashire

PostPosted: Fri Mar 20, 2009 9:18 am    Post subject:  

Nope, 'fraid not. I could start and stop the water pouring onto the ground underneath by turning hot tap on & off. The cold tank was brimmed (& had previously overflowed) so it's not iimpossible that pulling the hot supply disturbed the water in the cold tank sufficiently to "dislodge" some more to overflow, but I wouldn't have expected it to be at that volume.

Guess I'll need to do it in daylight next time & climb under the van to confirm exactly which pipe the water's coming out of.

Author: Zebedee

Location: Worcestershire

PostPosted: Fri Mar 20, 2009 9:32 am    Post subject:  

Rosbotham wrote:
I could start and stop the water pouring onto the ground underneath by turning hot tap on & off.

In which case I'm baffled - though this is not difficult to achieve! Wink Embarassed

Under the van (with a brolly! Shocked ) for a look while the Memsahib operates the hot tap. That sounds like the only solution!!

Dave

Author: brisey

Location: Middlesex

PostPosted: Fri Mar 20, 2009 10:57 am    Post subject:  

You haven't by any chance left the grey water tank drain tap open by any chance. Turn tap on, water comes out into sink, goes to grey tank and exits from the drain tap onto the ground.

Author: Rosbotham

Location: Lancashire

PostPosted: Fri Mar 20, 2009 11:27 am    Post subject:  

Nope, definitely not that...while this is going on only thing coming out of the taps is the trapped air.

Author: peteincambridge

Location: Cambridgeshire

PostPosted: Sat Mar 21, 2009 7:53 am    Post subject:  

We have this problem using a TRUMA COMBI. We empty it in case of frost. Then when we come to re-fill it will not fill and water pours of the drain valve. It seems to be to do with temperature. Below 3 degrees C the valve opens automatically and water pours out but when above 7 degrees it can be closed. Our boiler can heat without WATER so we switch the heating on to get it above 7 degrees than hey presto! it can be shut off. I'm looking forward to Summer.



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