Subzoning/branching within 1 thermostat


Old 01-20-08, 07:42 PM
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Subzoning/branching within 1 thermostat

Sorry for creating another thread dealing with same problem, but I would like to try a different approach.

With originally designed 7 zones, the thermostat wiring was only made to 2 locations. Until now I thought it's useless, but I got a new idea.

Since the only piece in this puzzle was missing call for heat, why shouldn't I use these thermostat wires.

One of them leads to first floor, which would take care of slab.
Second goes to second floor, which would do the underfloor.

The question I have, with additional controls, is it possible to get subzoning/branching?

Ex, 2 injection pumps would do 2 temperatures for slab and underfloor. Then, using ex. mixing valves slab would be subzoned into 2 zones (1 would be set on thermostat) and underfloor would be subzoned into 5 zones (again, 1 set on thermostat).

How would You achieve multiple temperatures?
Is my old approach with mixing based on outdoor/supply ratio a real option here or it can be done differently?
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Old 01-20-08, 10:11 PM
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I'm thinking you'd just use the Trinity's controller for controlling temps for the two upper levels. To get down to slab temps, you've got many many options.

From a DIY perspective I'd first consider proportional reset - a few simple valves and another pump, with the downside that the slab could vary based on variations in the high temp heating circuit.

Like the above, except the high temp feeds one or 2 manifolds for 12 ports.

For the low temp circuit, instead of the smart 3-way mixing valve, you'd just use globe valves on either side so that the mix ratio is kept constant - then it should be proportional to the ODR (which may or may not work for it as well).

Any more complex than that and I'd look at a Taco RMB that will give the low temp circuit it's own reset curve. But them again, I'm a simple thinking amateur.
Old 01-20-08, 11:32 PM
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I have to keep a primary loop in mind.
You can see both slab and underfloor low temp loops.
These 2 plus whole secondary slab will need some mixing.

Here is design (simplified view), so far:

Let me know if it's too big

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