Truma Combi heating only

[MarkJ]

Probably a dumb question, but with the widely used Truma Combi 4 or 6 heating stuff, why can't you just have the warm air heating on and not heat the water in the boiler? My reading of the manual (and experience) is that assuming you do have water in the hot water boiler then you can
- just heat the water,
- heat the water whenever you have air heating on,
- heat the water to 60 degrees and have the air heating on
But not just air heating. Wonder why?

Ps did you know that Truma Combi spell checks to trauma combined? Makes a lot of sense!

 

[Teutone]

Probably a dumb question, but with the widely used Truma Combi 4 or 6 heating stuff, why can't you just have the warm air heating on and not heat the water in the boiler? My reading of the manual (and experience) is that assuming you do have water in the hot water boiler then you can
- just heat the water,
- heat the water whenever you have air heating on,
- heat the water to 60 degrees and have the air heating on
But not just air heating. Wonder why?

Ps did you know that Truma Combi spell checks to trauma combined? Makes a lot of sense!

You can use the heater without warm water. Dial one click down to the flame symbol. Two clicks down is heater AND water.
Turn the dial upwards and you will only have warm water, one click up is 40deg , two up is 60 deg

 

[MarkJ]

You can use the heater without warm water. Dial one click down to the flame symbol. Two clicks down is heater AND water.
Turn the dial upwards and you will only have warm water, one click up is 40deg , two up is 60 deg

Hmm. In my instructions it says that on that setting you are also heating the water to some extent because the element is on whenever the air heating is on. But it's unregulated, so short blasts of heating mean luke warm water, long blasts (as we did in Scotland in the spring) equals scalding hot water. Am I wrong?

 

[Obanboy666]

Just checked my Truma combi 4 manual and yes heating can be used with a drained water system.
My combi is controlled by a digital display unit, I will have to check the manual for actually using the heater without water in boiler.

 

[QFour]

It's down to the design of the system. The heating elements are in the center, then the air ducts and then the water tank. So if the heat is on the heat has to go somewhere. If the blower is on it comes out the ducting and heats the water otherwise it heats the water if the fan is off. It is therefore impossible not to heat the water unless there in none in the system but can you use it without damage with no water.



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[lebesset]

it's quite logical ....if you put the heating on part will come from the hot water

 

[MarkJ]

It's down to the design of the system. The heating elements are in the center, then the air ducts and then the water tank. So if the heat is on the heat has to go somewhere. If the blower is on it comes out the ducting and heats the water otherwise it heats the water if the fan is off. It is therefore impossible not to heat the water.

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Right, makes sense. Thanks for that.

So, in Scotland we needed the air heating on quite a lot and the water seemed to reach a zillion degrees. Is there a safety cut out? Or is the 'regulated' setting the one to go for normally? I suppose at the end of the day if it works that's fine - but my OCDness would like to know these things...

 

[rugbyreddragon]

If temperature goes below certain level a safety valve opens and dumps the water from the boiler to avoid frost damage. The instructions state to get temperature up in order to close safety valve use the heater only to increase the internal van temperature.

So obviously can be used on heater only and not water as well.

 

[Obanboy666]

It's down to the design of the system. The heating elements are in the center, then the air ducts and then the water tank. So if the heat is on the heat has to go somewhere. If the blower is on it comes out the ducting and heats the water otherwise it heats the water if the fan is off. It is therefore impossible not to heat the water unless there in none in the system but can you use it without damage with no water.

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Yes you can without causing any damage, just read through my manual to confirm.