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pump control question

Hi all,
I'm in the process of figuring out the controls for my system. I have a tekmar 356 for injection mixing, grundfos alpha for the system pump. the zones are all radiant floor, with a combination of manifold actuators (2-wire no end switch) and zone valves. I have been planning on using a taco zvc zone valve control, but I realized that with the alpha autoadapt mode, it should just stay powered all the time and not be switched on and off by the ZVC. This leads me to think I could eliminate the ZVC altogether. But when there is a call for heat, I do need to trigger the 356 and the boiler primary pump. So is there a way I can somehow add a relay that will power the 356 injection controller and boiler pump based when the Alpha runs? I can't think of anything besides some kind of current sensing relay, but the power draw of the Alpha is so low that it probably wouldn't work properly. So any way to "detect" when the Alpha runs? Or does it make more sense to just use the ZVC and trigger the 356 & boiler pump from X-X? Thanks!
I'm in the process of figuring out the controls for my system. I have a tekmar 356 for injection mixing, grundfos alpha for the system pump. the zones are all radiant floor, with a combination of manifold actuators (2-wire no end switch) and zone valves. I have been planning on using a taco zvc zone valve control, but I realized that with the alpha autoadapt mode, it should just stay powered all the time and not be switched on and off by the ZVC. This leads me to think I could eliminate the ZVC altogether. But when there is a call for heat, I do need to trigger the 356 and the boiler primary pump. So is there a way I can somehow add a relay that will power the 356 injection controller and boiler pump based when the Alpha runs? I can't think of anything besides some kind of current sensing relay, but the power draw of the Alpha is so low that it probably wouldn't work properly. So any way to "detect" when the Alpha runs? Or does it make more sense to just use the ZVC and trigger the 356 & boiler pump from X-X? Thanks!
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Comments
trainer for Caleffi NA
Living the hydronic dream
What I'm thinking is: current sensing relay on Alpha N.O. contacts close -> 356 mixing demand terminals & RIB dry contact relay to power primary circ at the GARN.
trainer for Caleffi NA
Living the hydronic dream
http://www.functionaldevices.com/building-automation/currentsensors.php
trainer for Caleffi NA
Living the hydronic dream
FDI has current sensors with power relays included -- see the lower third or so of the link above.
The Wattage displays on ECM circs are not particularly truthful