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1992 Stadler Install needs an outdoor reset upgrade
First, thank you in advance for your time and help. I will surely pay it forward whenever possible.
I just moved into a home that was built in 1992. I bought it from my best college buddy. He installed a veissmann boiler with radiant heat through the house. The system has four zone controllers. Three are taco controllers and one is a viega for the basement floor radiant. On the main panel, there is a stadler wd-23 outdoor reset control, but the outdoor sensor is gone. I think they remodeled outside and the sensor is a casualty. Also, there's a supply temp sensor that is hanging off and not connected to the pipe. The mixing valve actuator is also not installed and hanging off the wd-23. The diverter appears to have been retrofitted with a stadler non-electric actuator which is connected to a capillary senso on the supply side manifold. The manifolds are stadler and the diverter appears to be stadler. There are a number of wires running from the wd-23 which look to be labelled rm sensor, outdoor sensor(missing), boiler, boiler sensor, etc. I've contacted viega and they suggest I replace the Wd23 with a viega basic heating control, a new mixing valve actuator, an outdoor sensor, and a new room sensor. Here's where I need help... I'm handy, but a novice at this system. My friend owned an oil company and they did all the service. I don't have unlimited access to technicians like he did. They tech who maintained the system seemed to recall that the stadler manifolds and divert r valve are metric and therefore would be incompatible with the newer viega valve actuator. Does anyone have any recommendations? Would it be better to consider Teckmar or wirsbo for reliability, comparability and ease of install or am I best off with viega? Oh... I also found a very small brass pin with a ball on the end which looks like it belongs to the valve actuator... Not sure if that's significant info. Thanks again! It's a puzzle.