We use the Webasto Air Top 2000. This is from the product manual:
Quote:
9.1.2.1 Installation of an External Temperature
Sensor (Air Top 2000 Diagnosis)
General
The heater Air Top 2000 regulates the desired temperature
best when its temperature sensor is exposed to the
air temperature of the most probable surrounding in use.
This might not always be possible due to the installation
conditions with the temperature sensor being integrated
in the heater. In such case the best temperature control
may be achieved by installation of an external temperature
sensor in the relevant room area.
|
Here's the link to the product manual:
http://www.techwebasto.com/heater_ma...hop/776891.pdf
The unit has a control knob, which looks like a rotary temp knob on a dash. Also, it has an internal temperature limiter built into it. The internal unit senses the incoming air temp and regulates through it. So, the best way to install it would be to have a return air duct hooked up, as well as the heated air outlet duct. They install ours into the sideboxes without a return duct, so it's essentialy sensing the air temp of the air inside the sidebox, not the air temp of the cabin. With the external sensor added (which is a tiny thing, about the same size as a temp sensor for one of the cheap outside thermometers you can grab at any truckstop). Then it'll use that for sensing the temp instead of the internal sensor.
Hope that makes sense ;-)
I know it'd be easier to use the external sensor. The reason being that if you put the return air duct close to the floor, it will be sensing the temperature there, not high up in the sleeper. Remember, hot air rises. So, you'd end up with the bunk being comfortable, but as soon as you stand up, you'd be going into the hotter air.