Hi all - here's a quick overview. I'm a DIYer that's been reading around and trying to confirm function/wiring so I don't damage any system components. I have the 100+ page Taco wiring PDF
and several of the diagrams initially look like they will work for my system. I've been overthinking things a bit so wanted to get some outside opinions. Thanks in advance for any assistance here.
- 1x Navien NCB-210E Combination Boiler
- 1x Taco 007-F5 Circulator
- 1x Taco SR501-4 Switching Relay
- 4x Taco Zone Sentry Zone Valve
- 4x Nest Learning Thermostat
I want to add
- 1x Taco ZVC404-EXP-4 Zone Valve Control
1. The existing system works fine, there are no issues. I am simply looking to tidy things up by integrating the Taco ZVC404-EXP-4 Zone Valve Control.
2. I hope to add some radiant in floor heating in the future. (Thought this could be a factor in responses.)
The Navien NCB-210E handles all DHW operations internally so, in theory, I should only need to wire the Taco SR & ZVC units for heating. As I understand it, the SR501-4 is for operating 120V components while the ZVC404-EXP-4 will handle the low voltage components.
1. Do I need both the SR501-4 *and* the ZVC404-EXP-4? I ask because it looks like the ZVC404-EXP-4 is capable of handling the circulator on pages labelled 28 & 50 (bottom) of the Taco PDF.
2. If I keep both the SR501-4 and the ZVC404-EXP-4 in the system, pages labelled 11 & 54 look like they could they should work. Is there a benefit to one being the master over the other (switching relay vs zone valve control)?
Again, thanks in advance for any help - it's greatly appreciated.