hey there. i just bought a triangle tube smart50 to use with my buderus gb142 (which i've had for about 2 years now). my plumber installed it, it looks good, but he advised me that he's nervous of wiring/electrical devices he doesn't know much about. i'm alright at wiring electrical devices, so i figured i'd give it a shot. that said, i've spent the past couple days troubleshooting why i didn't have hot water in my taps. here's my situation...
on my buderus, there's a number of low-voltage 2-wire molex-style connector slots. one of which is for the temperature sensor from an dhw heater. after much trial and error, i figured out that the only dhw sensor that seems to work with my buderus is the one that came included with it; not any others (like the jumper i made to go from the smart50 to the gb142).
i powered down the system, and as soon as i plugged in the stock dhw buderus sensor, it activated the dhw side of the boiler the next time i fired it up. however, as you could imagine, the hot water section kept cycling and cycling, as the sensor was only picking up ambient air temperature, and no matter how much hot water was pumped through the indirect, the temp sensor never budged. obviously. so i turned the boiler off when it started to really heat the indirect's water.
so, in trying to figure out where to stick this sensor (apart from directly attaching it to the return line to the boiler), i decided i would just replace the stock triangle tube dry well sensor with the buderus one...seeing as how that seems like the only way to activate the buderus dhw section.
here's my issue(s): the metal sensor portion of the gb142 was nearly identical in size to the stock sensor on the smart50, so it fit down the dry well shaft just fine. after the tank heated up to a working temperature, the gb142 sensor seems stuck in the drywell. is this just me being a little too cautious? or did the gb142 sensor expand more than the stock triangle tube one would have? in researching the buderus line of indirects, i notice the sensor is only partially inserted into the side of the tank, rather than through a long dry well on the triangle tube heaters. this also made me somewhat nervous for putting the buderus sensor down the triangle tube dry well...
also, i had to marrette the connection to extend the buderus sensor's length, to accommodate the distance between the boiler & the indirect...now the dhw section of the boiler control is showing the same as before, with no indirect being detected. did i fry the sensor? or is the hot water in the tank just hotter than even the highest temp setting on the dhw section of the buderus?
(does all this make sense?) any help is appreciated!!!