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Tekmar 508 and Taco Zone Controls
I am running into issues with this set up. The story: I built this system many years ago, maybe 5... and it sat for some years in a house that was never finished. Thieves eventually broke in and cut out all of my copper work... leaving the electronic components and some pumps just dangling in the wind.
A friend of mine bought the house - and completed it - and as a favor I offered to rebuild the system. Unfortunately I do not remember what my design was... I just did my best to reimagine what I had originally planned and tried to fill in the blanks.
The issue I am hitting right away in with the Tekmar thermostats. When I connect them to the Zone control (with 120v circulators, not zone valves) They light up, but show no display. No numbers, no info, no error messages or codes. They also immediately cycle on the zones... each circulator slams on at once.
One relay clicks rapidly and the circulator fails to start. I am guessing that one is frozen from sitting out of use for so long (the system was drained but wet enough to rust I suppose). In this picture I have them disconnected to stop them from running constantly.
The thermostats I really have no guesses for... but this was my first time using this set up. I am not even gotten to the point of wiring the boiler, aquastat, etc. but just wanted to see that the thermostat wiring I had originally placed had not been damaged during the remodel.
These Tekmar units have a slab sensor as well... which is 2 wire. They control 2 isolated radiant slabs within the home.
Thank you so much... for your time