Hi Andrew,

I haven’t used the infrared sensors with signals but instead with occupancy detection. For that application it has worked flawless and as reliabable as contact tracks. I don’t recall ever having false signals and whether night or day in train room it works.

I use the options across the track detection. Make sure you install them at an angle (that is not perpendicular to tracks).

If you can find documentation that it should work with Viessmann type signals on their website I am sure it will. Else drop them an email (I got very fast replies from the owner when I had some inquiries.

Best Regards
Lasse

A suggestion: Instead of removing the resistors, especially if they are difficult to remove, or are surface-mount resistors, short them out instead. It'll be faster, and less likely to cause damage. I suggest bridging them with a wire clipping, or using a dab of conductive paint to bridge a surface-mount resistor.

I've never seen the inside of a Viessman signal, so not sure what you'll find.

Hope this saves you time and trouble...

I now have some experience with the Azatrax controllers and the Viessmann signals, so thought I would share my results. 1. The infrared sensors are reliable in dark and bright light conditions. 2. An LED with the resistor attached appears to be just as bright as an LED with the resistor removed. 3. On my test track I have 3 blocks. The eastbound signals are #4012 entry signals wired so each of them alternates between green, red, and yellow, the same as 3-color block signals do here in the US. The westbound signals are #4014 block signals with advance signals, wired so the advance signals are controlled by the aspects of the next home signals. Both types of signals change aspects as expected. Verdict: definitely consider Azatrax products for occupancy detection and signal control.