applefarmer
ArboristSite Operative
I got thinking about that thermostatic valve from CB. If the water is about 20 degrees cooler than the the unit says it is, then the valve is almost never going to be fully open. (170). My water at the HX is been consistently at 165, sometimes up to 169.
The valve doesn't care what the temp on the owb says it is, it only cares what the water going through it is. That seems kinda dumb to me.
Oh well.
That is what I was getting at. I think most people don't really have a clue what their actual water temp is they just go by what the unit says. I assumed you were told the different temps about the valve by your dealer and I just wondered if he was using what the read out said or "real" water temps. If the valve requires 170 and you are at 165 your losing flow to the hx if it is sending it back to the boiler, which could be a problem when you start heating your dhw and it gets colder outside. I would call central boiler direct and tell them what you are seeing as far as real water temps. If that is really sending back water at 165 you are losing heat at some point. I don't care how good foam insulation is (and I know it is good as it is in my house) the boiler losses a little heat just from being outside. That 165* water would do you better if it all went to your hx-house.
With that being said a 25* delta t is just about where you want to be, if you were losing flow to the hx via the valve the delta t would be higher. I guess if you like to play around a little let your boiler temp drop then see what your hx gives you for temp readings. The more I think about it, I really think I would talk to a tech at CB, that valve just doesn't make sence to me.
Oh and the concern about the insulation would be the slim chance of a fire.
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