Truma heating without power on (1 Viewer)

[steveswift]

Silly question maybe , but I don’t know if anyone can clarify , I assumed my Truma heating wouldn’t work without a power supply , however , noticed this morning when I turned power off the fans around home continued to blow hot air ??

Is this normal because common sense tells me power is required to power the fans that blow the heat?

I’m not on EHU , and the power is turned off , but heating still blowing hot on 20 degrees

Can anyone clarify

Thanks

 

[WillH]

The Truma uses 12v power except for the heating elements which are 230/240v.

 

[paddymcc]

The fan will continue to blow until the air from the heater drops below the thermostat temp - often it powers up more for a minute or so and then stops. The fan and controls as willH said are running on 12v

 

[steveswift]

The fan will continue to blow until the air from the heater drops below the thermostat temp - often it powers up more for a minute or so and then stops. The fan and controls as willH said are running on 12v

Yes i understand that , however , power is off , so how is 12v powering the fans ?

 

[steveswift]

The Truma uses 12v power except for the heating elements which are 230/240v.

But there is no power on , power is switched off at unit , heating still blowing , 30 mins since switching off

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[Lenny HB]

That's normal, the 12v supply to the Truma is normally fed from a permanent 12v supply so if you turn the control panel off it still works.

 

[mitzimad]

Obviously what youve turned off doesnt turn of the heater

 

[steveswift]

That's normal, the 12v supply to the Truma is normally fed from a permanent 12v supply so if you turn the control panel off it still works.

Oh fantastic so won’t drain my leisure battery ?

 

[Reallyretired]

Power isn't off. Usually turning off 12v at the panel does not turn off supply to the heater fridge electric step and often one of the lights. It is still using your leisure battery.

 

[steveswift]

Obviously what youve turned off doesnt turn of the heater

My understanding is when this is set to off . All power is off ?

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[steveswift]

Power isn't off. Usually turning off 12v at the panel does not turn off supply to the heater fridge electric step and often one of the lights.

Oh great to know many thanks , for sure though if power is off my lights don’t work . Other things I haven’t checked but thanks

 

[Lenny HB]

Oh fantastic so won’t drain my leisure battery ?

It's still running from the leisure battery.

 

[steveswift]

It's still running from the leisure battery.

Oh I thought If power was switched off at panel , there is no power from leisure battery , thanks

 

[rod_vw]

I would assume that the heater has a permanent supply regardless of switches to ensure that it always shut down in a safe and orderly manner. This would be to make sure that the burner area was cooled to a safe temperature and all combustibles were completely burnt and gasses cleared from the system.

Eberspacher / Webasto blown air heaters work that way for safety so I don't see why a Truma would not be the same.

 

[paddymcc]

My understanding is when this is set to off . All power is off ?

Not everything - the electric step and the boiler low temperature dump valve and various other bits will still have a 12v power supply

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[Lenny HB]

Not everything - the electric step and the boiler low temperature dump valve and various other bits will still have a 12v power supply

And the fridge.

 

[Hoovie]

The fan will continue to blow until the air from the heater drops below the thermostat temp - often it powers up more for a minute or so and then stops. The fan and controls as willH said are running on 12v

just an FYI.... Depending on the model of Truma Heater, you have two options:
1) Set the fan to Auto and it will run between off and the maximum you set on the speed dial depending on the temperature
2) Set the fan to On and it will run constantly at the setting you select on the speed dial

Option 2 is very useful as you can use it without the heater being on to provide blown air ventilation in the summer.

 

[Lenny HB]

Option 2 is very useful as you can use it without the heater being on to provide blown air ventilation in the summer.

But they run at full pelt drain 5-6 amps and hardly do anything to cool the van.

 

[Hoovie]

But they run at full pelt drain 5-6 amps and hardly do anything to cool the van.

It is not an air conditioner so no reason why they should provide a cooling feature - but they add circulation and with an extraction fan running it is handy.

And it IS still an available option

 

[GeoffnDee]

steveswift You need to turn the heating off using the separate Truma control as later Motorhomes have Truma heating that can be used en-route and has its own power supply not involving the Motorhome control panel being on or off ( it may still run a short time for its cooling sequence and then stop)

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[VXman]

Oh great to know many thanks , for sure though if power is off my lights don’t work . Other things I haven’t checked but thanks

On mine some of the internal lights work with power off - others don't.

 

[Lenny HB]

On mine some of the internal lights work with power off - others don't.

That's normal & the step.