ok, I was a bit quick to post that. I've discovered that it will be fine.
On this thermo the connections are as follows:
1 = Call for Heat
2 = Common
3 = Heating Satisfied
Using the a Y-Type plan I should be connecting:
Thermo 1 (call for heat) to terminal 5 (white on the 3-port 5 wire valve)
Thermo 2 (common) to terminal 4 (Heating of the programmer)
Should Thermo 3 be connected to Neutral or not connected at all?
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