Danfoss TRV

Alan (California Radiant) Forbes

Last week, we had to replace an Infloor mixing station and leaking Infloor manifold. When all was done, we flushed the system. The manifold flushed well, but the upstairs baseboard loop was stuck - zero flow. We removed the BB end caps to discover that one of the TRV's was lodged in the closed position. Unfortunately, I learned that you can't replace just the valve inside the body, you have to replace the whole darned thing which meant de-soldering the fittings since it was so tight to the wall. I was afraid that I'd burn the place down.

Paul Pollets

There is a tool to remove the piston assembly in the TRV body. I happen to have one. Available from Oventrop

Alan (California Radiant) Forbes

I see it now. Wish I'd known and my supplier couldn't help.

https://www.gsistore.com/products/003l-0213?utm_source=googleshopping&utm_medium=cse

Bill_17

Danfoss offers the tool as mentioned above and inserts (guts) for the valves, so the exiting valve bodies can be renewed. But, the picture appears to show a valve mounted dial & sensor above the (hot) valve. Being mounted in this position will always result in an under-heated room as it cannot sense room (ambient) temperature. If there is remote sensor on this unit, it is not seen in the photo.

Paul Pollets

It's rare to see a TRV mounted directly on BB. Usually, the remote TRV with 6' capillary is used.

hot_rod

Paul Pollets said:

It's rare to see a TRV mounted directly on BB. Usually, the remote TRV with 6' capillary is used.

And ideally they should have the knob mounted horizontally so it gets air circulation thru the slots in the knob. Tough to do that on baseboard without risking damage, however.

Alan (California Radiant) Forbes

Yes, it's a funky installation and it was tough accessing the valve. The BB end cap was screwed into the wood baseboard before the TRV was installed, so we had to sawsall through the screws. Also, the setscrew that secures the operator onto the valve was facing the wall. The first picture was taken after I was able to turn the operator setscrew towards me, but by then, the setscrew wouldn't budge and I had to destroy the operator to remove it.

Paul: I hardly ever see remote operators with a capillary here in the Bay Area. I guess it wasn't a popular thing to do.

hot_rod

You need a way to get the cap tube from the valve to the operator, and they are not usually very long 2- 3M typically. Ideally in a conduit in case you need to replace the operator head.
A limited application.