When using a LLH do I need a Spirovent or Wye strainer?

binskibok

Currently installing a Vitodens 200  in a Cape with 3 zones (copper to runtal, black pipe to convectors)  using Grunfoss alpha with zone valves.  Should a spirovent and wye strainer be a required part of the system layout or is it a duplication of function since Viessmann requires the use  of a  Low Loss Header  which seems to have similar functionality?   I'm looking for the best possible system layout  without  redundancy or added costs.  

CMadatMe

Not Necessarily

Check out the attached LLH's. They do have a sensor port in the them and I like them better than the Viessmann LLH.

Simply Rad

TRVs

Instead of the 3 zone valves why not use the Vitodens the way its meant to operate, with continuous circulationand TRVs.  Especially with the Alpha and the Runtals



The LLH has a manual air vent and by design,  trap the dirt and debris at the bottom of the LLH and can be removed with the drain. 

Jeffrey

binskibok

Will constant circ work with 1950 type convectors ?

Your mention of constant circ is definately the way to go  but I'm limited to 1950 type convectors on the first floor. Until I convert those to newer radient panels with TRVs I fugured the zone valves were the way to go. Being the homeowner I found that this boiler upgrade project has been quite the learning process for me .  I will talk to the installers for more feedback.  I'm trying to be both green and energy efficient. It seems that I made the right decision by going with Viessmann. Thanks again for your comments and suggestions.