Staple-up zone controlled by TRV...

Rocky_2

12 Buderus panel rads on a "home-run" system with 1/2" MultiCor and with TRV's on constant circ to heat the house. Kitchen has no place to put a panel rad and do not want to use a toe kick heater. Also do not want to put in motorized zone valve or electric thermostats. Want it all to be self-regulating via TRV's. Thought about doing a little staple up under kitchen floor for floor warming. Does Danfoss or anybody make a slim sensor I can put in the plywood floor that reports back to a TRV installed on the two-loop manifold to regulate the kitchen floor warming? I thought about cutting a little groove in the plywood floor, inserting the sensor, and running the capillary back to the TRV on the manifold in the crawlspace. Could not find a slim type sensor on Danfoss' web site, only wall mount style. Don't want the kitchen staple up to run wild as I am afraid of overheating. Also, don't want to go to the expense of installing a mixing device and pumps etc to temper the staple up with outdoor reset. Boiler (Buderus 115-21) will be reset (resat?) with tekmar 260. Would really like to find a way it could all be done with TRV's and the one boiler pump with one water temp coming out of the reset boiler. What say ye? What are some non-electric alternatives? How do I sense the floor temp non-electrically? C'mon Wallies, I KNOW someone has done this before.
Warm regards from smokey Fairbanks (forest fires are rampant again this summer and smoke just hit town today...Yuck!)
Rocky

Paul Pollets

UniBox

Try the Oventrop UniBox. It will allow you to take off a zone of low temp for RFH, using the radiator mains. No mixing station required. The UniBox can handle up to 12K Btu's using a i/2" supply and return. Set the heating curve on the system for the radiators, and the Unibox will simply lower the radiant zone in parallel, using a TRV head and actuator. Don't forget the pressure bypass differential on the pump, when doing this!!

You can find pics on some typical projects using this method by typing "Oventrop UniBox" in the Wall's search engine.

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Paul Pollets

Link

More info:

http://www.supplyhousetimes.com/CDA/ArticleInformation/features/BNP__Features__Item/0,5333,132161,00.html



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Rocky_2

Paul! You ROCK!

That is EXACTLY what I am looking for! I already had an Oventrop pressure bypass valve figured in so this will be a snap. Great find. Thats why I like the Wall so much. We are fairly limited in the amount of locally available stuff here in our small, isolated burg. I really like hearing about all the cool stuff you guys are working with everyday. I very much appreciate the info, this is going to work slick as all get out.
Regards,
Rocky

Unknown

Won't using a TRV to control the floor loop result in widely differring loop delta-T's at different times?

That is, I'd be concerned that only half the floor will feel warm as the TRV tightens up flow.

Paul Pollets

Nope...

the device has a built-in limiter and holds constant temps throughout the zone. No concern.

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Unknown

That's pretty slick!

Mike T., Swampeast MO

Danfoss FHVs

Available in two models. One modulates on panel temperature--quite limited in square footage. The other modulates on return temp--"safe" level about 10,000 btu/hr for the panel.

Both have a built-in flow (restriction) adjustment to avoid JUST the problem you state--overheating.

Regulating Valve, FHV

ScottMP

SO's

Paul ...

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