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Old 01-10-2010, 11:05 AM   #1
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wiring tstats,actuators,pumps for hydronics


I'm doing a DIY solar heated hydronic system and getting ready to wire the controls. I have some questions on options for the wiring interface between thermostats, 4 wire zone actuators, and circ pumps. System has 2 manifolds,one for 5 zones of in-floor, the other for 3 zones of in-wall pex at a higher temperature. Back up heat is a woodstove when solar heated tank has been depleated. Questions as follows:
1)What is the difference between zone controls (taco ZVC03) and switching relays (tacoSR502)
2)Do I need one for each manifold or,for example,could a 2 zone switching relay control both circ pumps with wires for all actuators on a manifold pig-tailed together where connected to switching relay. Is there a way to do this and only open the actuator for the thermostat that is calling for heat.
3) Can I reduce material cost and do this with a simple relay switch powered by a transformer. The sales pitch for the zone control seemed to be simplifying the wiring mess and I wondered how involved that would be. I installed a boiler years ago and I remember doing just that, on't recall any real issues.

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Old 01-10-2010, 08:18 PM   #2
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wiring tstats,actuators,pumps for hydronics


ZVC is a zone valve control. And would use one circulator for all zones.
SR is a switching relay. And uses one circulator per zone.

A typical taco zone valve will add 7 foot of head to the loop its on.
Meaning that you may need to up the circulator size your using.

using one cir. you will have to really watch how you pipe things to control water temp to the loops.
Makes mixing valve piping interesting.

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