Wirsbo Pro Mix 201

Andy_23

Norm,
when i purchased the system I got the putdoor sensor, and two sensors. do I need to buy more?

Andy_23

Wirsbo proMix controls

I was wondering if anyone has tried the Wirsbo ProMix 201 radiant control. I installed one about two years ago and when I installed it the salesman said it was the greatest thing in the world. Every year I have a problem with it. I want to know the way to pipe it and where the variable speed pump should be located. Thanks

Norm Harvey

I just installed a 301 and a 201 and I love it. Im very happy.

What are the problems you are having. And as far as how to pipe it,.. Pipe it exactly according to the installation instructions.
Page 47 of http://advancedcomfortsystems.com/promix_201_manual.pdf

Andy_23

Norm,
The room either gets too cold or is extremly hot. The variable speed pump is not working and the supply water is very hot and the return water is cold. The sales man gave me a drawing that only had two loops and two pumps. Every other drawing I see has three. Is that my problem why I cannot control the system or is it because I have no check valves in the system? Do I need a three way mixing valve?
thanks

Norm Harvey

You need 3 circulators,
Primary loop, VS circ, and the circ for your radiant zone.

Page 47 of the manual shows you the piping schematic. it should be piped as shown.

Follow the manual for piping arrangement, sensor location, and wiring and you'll be all set.

Have you done your calculations for flow rates etc for circulator sizing?

Andy_23

Norm,
We did the flow rates and they are right. My best option is to add another loop into the system. should the variable pump be on all the time or not. or should i rip the system out and go with one with a mixing valve?

Norm Harvey

Ideally it should be on most of the time.

Im a big fan of injection mixing. I would pipe the injection method properly rather than down grading to a mixing valve.

It sounds as if things aren't piped properly, your missing some components, and you may be lacking some sensors.

I dont mean to sound stand offish but the manual is very detailed. Follow the piping, and wiring schematics and you'll be all set.

Ed_50

Downgrading to a mixing valve?

Huh?

Did you know the only way to assure the lowest return water temperatures when mixing with a condensiing boiler is to use a motorized three way? Any other type of mixing decreases efficiencies by raising return temperatures.

Injection works well with some systems, but mixing valves are by no means a "downgrade".

Norm Harvey

I understand motorized mixing is great, I am assuming he is going to scrap the control and injection and go with a manual mixing valve