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[amigo]

Customer wants to use separate power sources to power up Tstat, and separate power to get switched through tstat to turn on valves (2-position).
Essentially tstat power and valve power are 2 different 24VAc sources.

Can this be done?

Products: VT7200 and VT7300

Thanks.

[Zinc22]

You could, but you have to be extremely carefull not to mix up the common & the grounds of the transformer.

May I ask why ?

Most of the time, we advpocate trying to use a single transformer or even use the existing equipment mounted one to save $$. 

If absolutely necessay,let me know your setup and I will give you a drawing showing how to do it.