Laddomat 21-60, what opening temperature?

[Blofeld69]

The Laddomat 21-60 are sold in different opening temperature versions, 53°, 57°, 63°, 66°, 72°, 78°, 83° or 87°C

Can someone explain what this is about and which one should I buy for my HS Tarm Solo Plus 40

http://www.termoventiler.eu/media/upload/Lm21-60_E.pdf

Many thanks

 

[heaterman]

53*C = 127*F
57*C = 134*F
63*C = 145*F

Given that most manufacturers like to see a minimum of 140*F on the return you should go with at least the 63* model. Best advice would be to call Tarm and ask them what they recommend.

Callefi makes a very nice thermal protection valve that comes in different temps also. I like them because they have unions and that is always a good thing down the road. Look up Callefi model 280 thermal mix valve and you should find them.

Here's a handy, downloadable and free converter for Windows systems that will tell what equals what for temperature along with a host of other parameters.

http://joshmadison.com/convert-for-windows/

 

[maple1]

It's recommended that return water should be no less than 140°f. Some say 160°.

So I'd say either the 63°c, 66°c or 72°c.

Does your boiler have a specified minumum return water temp? Usually it's spec'd in the manual.

 

[maple1]

Guess someone beat me to it.

EDIT: Specs I found are for 140°f opening.