Webasto Air Top 40 Evo

One more question, if i may, if i let the heater start in normal mode, what happens when the temperature is reached, the fan speed decreases and it goes into eco mode temporarily because it gives less power? Are there variables in each mode eco, normal and boost? eg normal mode between 1.5 and 3kw?

Thx , Benji
 
Normal output is a maximum of 3.5Kw. Boost gives the extra 0.5Kw. Eco runs at the 1.5Kw.
In normal use you just use the normal output and it will automatically vary the output between 1.5Kw and 3.5Kw. Eco mode should only run at the 1.5Kw. Boost should drop the output as the set temperature is reached behaving like the normal mode.
 
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My semi-integrated camper is 7 meters, hence the 4 kW version. We have a cat that never goes outside and always lives in a temperature of at least 17 degrees, so that's why warming up at night is necessary. If we use the heating 20 days a year it will be a lot, we are more away on the warmer days, but I take your advice to heart and will use it as little as possible on low and if this has happened, let it burn on normal for a few hours afterwards. Thx, I learned a lot about Webasto here.

I wish I could return the favor, buy you guys a beer when I'm around :)

Benji
When I had a 7 m van I only used a 3.2Kw Webasto which was sufficient for that size. It is a pity that Webasto do not still make that output of heater. They have been slowly increasing the output from 3.2 to 3.5 to 3.9 and now 4Kw over the years. Annoying when you only need a 3Kw output heater.
 
I thoroughly tested the Webasto today with the knowledge gathered here and notice that when I set 12 degrees on the multicontrol in normal mode the Webasto starts to run softer at 19.5 degrees and continues to spin gently at 20 degrees to keep the keep temperature constant, It speeds up again as soon as the temperature drops, so he works perfect. The camper builder has therefore mounted the temperature sensor in a very bad place, but i have to live with that, because is not easy to move it.

Thx again for everything,

Benji
 
I thoroughly tested the Webasto today with the knowledge gathered here and notice that when I set 12 degrees on the multicontrol in normal mode the Webasto starts to run softer at 19.5 degrees and continues to spin gently at 20 degrees to keep the keep temperature constant, It speeds up again as soon as the temperature drops, so he works perfect. The camper builder has therefore mounted the temperature sensor in a very bad place, but i have to live with that, because is not easy to move it.

Thx again for everything,

Benji
Not quite sure if it's the same issue, but we have the Airtop2000 & the temperature sensor is in the cold air inlet in the drivers step. Consequently, the air being "sensed" is much colder than the actual temperature in the cab. If we set the temperature on the controller to 17-18C, the heater never shuts down & the cabin is much too warm. Setting the temperature to around 11-12C is about right. Try starting the heater, let the cab get to a comfortable temperature & slowly turn down the thermostat until the heater goes into standby mode.
Ahem! cough cough! It only took 24 posts, but we got there eventually:whistle:
 
Yeah, I know, but now I also know how everything should react correctly, that's the way ;)
I think it is working correctly, in that the target temperature is read by the sensor in the cold air intake of the heater. I’m not convinced that your remote temperature sensor actually exists, or if it does, that it’s installed/working correctly. We don’t have the additional/optional remote sensor, just the standard setup, & ours behaves exactly the same as yours.
 
The sensor is far too low, try at 1.6 - 1.7m. It can go even higher if needed.

Your resistances do seem to be out though - 15.3 degrees on the sensor that I have just tested and the resistance is 16.01 KΩ
I will test several later to see if there are any that match yours closer.
 
I think it is working correctly, in that the target temperature is read by the sensor in the cold air intake of the heater. I’m not convinced that your remote temperature sensor actually exists, or if it does, that it’s installed/working correctly. We don’t have the additional/optional remote sensor, just the standard setup, & ours behaves exactly the same as yours.
It exist and is connected, i'm very sure of that, it can be defected or like Oldiebut Goodie says, the sensor is far to low placed.
Benji

20230325_165254 (Large).JPG
 
I wonder if the installer has made a poor crimp when they made their connections for the sensor. Might be worth checking them all. Ecu ones for sensor cable and the intermediate one.
 
I measure including 1/2 off the cable from the ecu to the sensor 13.24 KΩ.
I disconnected the sensor and measured again, without cable 13.4 KΩ at 20 degrees, is close to what you measured (13,5 KΩ @ 19.5 degree).
The other half of the plug to the sensor complies with 0.5Ω.
There was already a bad contact at the terminals of the sensor, because the sensor now measures more normally, i will clean the terminals.

Thx again for everything!!!

Benji
 
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I'm going to replace the clamps, they look compromised, strange, after 6 years, bad quality.

Benji
 
Double checked everything again today, and found that as soon as I pushed the sensor back into place, the reading went up by 2KΩ, the reason was that the back of the sensor ends in a cable shaft and colder air comes through here, already felt it when removing the sensor, man man man :-(

Benji
 
Because you were kind enough to measure everything so that I could compare this and locate the problem, I also find it always useful to provide feedback, so that others can also benefit from this, so many thanks again for all your time Oldiebut Goodie!!!

Benji
 
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