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UPDATE:

I was able to wire a C-Wire to the Ecobee. So now I got 24 Volt at the Ecobee. But it still won't run.No sign of action at all. Maybe because I got no green connection? Any ideas?

We relocated from Germany to the US and with the upcoming Autumn I try to make improvements on our temperature management. Our house has three zones with two furnaces. The single zone I was able to connect to an ecobee, although there was no C wire. But the PEK terminal that came with the ecobee helped me with that.

The other two zones are connected to the Mastertrol Mark V. For I got very limited knowledge about this system I better ask:

There is a cable (5wire)connecting the MarkV and each Thermostat. I hope that RWY are connected according to the typical scheme in these systems. If so I need C and Green. The wires are there hanging around the Cable.

I wonder if:

I can grab C from 1 or 2?

I can get green by connecting to the green cable on the left?

Maybe a stupid approach but hey! 55 years we had a water based heating system - this is 100% new to me….

Ot another approach: any idea how to wire that?

Any help is well appreciated!

Wiring Diagram

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LarsN Reimann
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Yes, 1 or 2 should provide a C (measure for 24v against R in each zone). And G may be accessible from the left-sided terminals. But you need to provide more pics of the actual wiring and a better description of the entire set up for a more thorough answer.

There was also a previous thread with this system:

Connection for C wire on Mastertrol Mark V zone control panel

diy_coder
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