Truma weirdo question ! (1 Viewer)

[Jaws]

Ok.. This one has got me a bit baffled..

As most of you know we have had the present van for 4 years.. When we bought it I had the Truma swapped out to a Trumatic C so we could heat the water with either gas or electric..

Just the way things work out, we have never, up until now, used the hot air blower on its own.. Always ( when off hook up ) switching to both water and blown air.. well a couple of mornings it has been a bit chilly so I have put the blown air on.

Seemed to work fine but this morning realised two things

We seemed to be using a fair bit of gas for just blown air, and lo ! The water is getting hot too.

Made sure the switch was in the correct place.. but as I leave the installation docs for all the various parts of the van at home, taking with us just operating info ( just in case ! ) I cannot check the wiring for the switch

Sooooooo

1) Anyone got a wiring diagram of a Trumatic C ( not one on the Truma web site that I could find )

2) Am I chasing fairies ? In other words is what it is doing normal ?

 

[Jaws]

Forgot !!!!!!!!!!!

Its a Trumatic C 6002

 

[jb0371old]

If you turned the gas tap halfway would that save you half the gas

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[Jaws]

I tried that.. and tried turning the pig tail upside down.. then tried holding my nose with the water on but nothing altered the situation oh:

Update though.. Have now found the VERY uninformative installation docs.. As much help as a chocolate sausage in a swimming pool in fact !!

 

[Gromett]

I have the C4002E. Even on heating only the water does warm up slowly. It can get pretty hot over a prolonged period of use but not quite hot enough for a shower.. It is ok for pot washing and shaving etc though. This is normal operation and has been the same on my previous 3 vehicles.

 

[Jaws]

Thanks Karl..
Had a sneaky feeling that would be the case but good to have it confirmed to say the least !!

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[dave newell]

Truma's C series heaters and the later combi units work by heating a central heat exchanger that is in direct contact with the water jacket therefore whenever the heater is used either in summer (water heating only) or winter (water and air heating) mode any water in the heater's tank will take heat from the heat exchanger and therefore heat up. It is the fact that the heat source, whether it be gas or electric, is only in contact with the heat exchanger and not the water tank directly that allows the unit to be used with no water in it.

d.