[HANDYDAVE1]

Need some help
I have been doing some research on taco's site and came across this schematic of the addition of a radiant zone
is it me or is this document showing the addition of the new zone after the circulator of the previuos zone?
Isnt the water for the new zone being forced throught the first circulator?

http://www.taco-hvac.com/uploads/FileLibrary/5000MixValve(PA07).pdf

 

[HVACDave]

It appears as though the first circulator is just providing a hot loop to the boiler all the time and the zone with the mixing valve is just drawing from the hot loop. This would be common if you had multiple zones that were feeding off of one boiler system, or if you had a high temp. comonent (like a hot water coil in an air handler) as well as, say a floor heat system that you wanted to control at a lower temperature.

 

[HANDYDAVE1]

Am I correct in thinking that a radiant zone needs its own circulator?