Thermostat Wiring

MykeWhyte

Quick explanation of my radiant heating system: I have a two story home with a basement. The heating is supplied through two separate manifolds. One manifold has a 4 zone control module that powers one thermostats in the basement and three thermostats on the first floor. The second manifold supplies heat to the first floor living room and a second floor bedroom radiator. The living room's thermostat controls the boiler temperature. There is another bedroom which has a runtal wall panel heater, but no heat. There is a thermostat, but it's not receiving any voltage. It looks like the previous home owner was trying to create a new zone in that bedroom. Two questions:

1) Where should I look to find the other end of the thermostat wire to see if it's attached to a power supply?

2) I almost certain that the runtal is not connected to either manifold, where could I look to find another heated water supply?

STEVEusaPA

Quick explanation...too quick.
Is the 4 zone control module power actuators? Because I don't understand 4 thermostats to one manifold.
I also don't understand how one thermostat controls the boiler temperature.
A picture may help, but a wiring diagram with all components called out would be better.

MykeWhyte

Yes the 4 Zone control powers 4 actuators, and the manifold has 8 loops. So the 4 thermostats are assigned to the 4 zones on the control module. The 4 Zones are the basement, two bedrooms, and a bathroom.



I have a Buderus boiler with the Logamatic control. The Logamatic control can be adjusted by a "remote", which is in the living room. The living room gets it's heat from a separate manifold





The other manifold has 3 loops which heats the living room and a bedroom.



Now upstairs there's a wall panel heater in a 4th bedroom which is not heating. There's already a wall panel heater in the room. I'm trying to figure out how can hot water be fed from the boiler to this radiator. Would it receive the hot water from the radiator in the other bedroom nearby, or would it have its own line to the hot water heater. The reason why I'm asking these questions is to understand the wiring

Jamie Hall

Seems to me -- but perhaps I'm missing something -- that the control system is, at best, a little odd. Why is it that the various thermostats don't each control their own zone, while the boiler should be controlled by an aquastat and, possibly, outdoor reset?

As to the wall radiator which isn't heating, the pipes to it must go somewhere, no? So the thing to do is to figure out where they go first. All the control jiggery-pokery in the world isn't going to do any good until you figure out the piping...

MykeWhyte

Hey Jamie... I think you pretty much said what I was trying to say. I just don't know the words for these parts. I'm learning day by day. It is likely that the boiler is being controlled by an aquastat. I just didn't know what it truly was. And every zone is controlled by a separate thermostat as far as I know. I'm trying to figure outt how to control the heat in the upstairs bedrooms. Bedroom 1's wall panel gets hot, and I know where the pipe line leads to in my basement. Bedroom 2's heater does not get hot. Now your question to me is the question I'm trying to ask. How would I go about finding out where the pipes to Bedroom 2's heater lead short of making holes in the walls. Where should I look? What should I do?

Jamie Hall

Well, one place to start, @MykeWhyte , would be down in the basement, where all the pipes from the various zones or radiators come together. If there is a thermostat for that zone, it's likely that somewhere down there there is a valve for it, just like the other zones -- so I'd turn up all the thermostats so everything is supposed to be getting heat, and then I'd feel the pipes going off the manifolds. And most likely you will find one that's cold, or at least nowhere near as hot as the others. That's the one you want. Then we can proceed from there. If there is a valve -- like the others -- that might be connected to that thermostat... or, just possibly, not.