From what I've read here the higher the Delta-T the better the efficiency. I can understand the thought, but what about the return temp protection?
For instance, I just went to stoke the boiler because it was starting to cool off and after a few minutes these were the temps:
Boiler source: 169
Boiler return (after termovar): 155
Boiler return (before termovar): 110
I'm thinking that's a Delta-T of 59, sounds good but the termovar is barely open not letting much actual return water back to the boiler. So the boiler is basically feeding itself and not much is going to the air handler to heat the house.
Now this is when the house was cold, about 64, so the return air was cold and was pulling quite a bit of heat out of the water, but I think a smaller Delta-T in this situation would be better.
My 3 speed grundfos was on high and the air handler blower was on high. My system is a Tarm Solo 30 and an air handler, no storage.
It seems to me that sometimes, too large a Delta-T from source to prior to return protection is not that good a thing.
I could be completely wrong here and am looking for input
Any thoughts??
For instance, I just went to stoke the boiler because it was starting to cool off and after a few minutes these were the temps:
Boiler source: 169
Boiler return (after termovar): 155
Boiler return (before termovar): 110
I'm thinking that's a Delta-T of 59, sounds good but the termovar is barely open not letting much actual return water back to the boiler. So the boiler is basically feeding itself and not much is going to the air handler to heat the house.
Now this is when the house was cold, about 64, so the return air was cold and was pulling quite a bit of heat out of the water, but I think a smaller Delta-T in this situation would be better.
My 3 speed grundfos was on high and the air handler blower was on high. My system is a Tarm Solo 30 and an air handler, no storage.
It seems to me that sometimes, too large a Delta-T from source to prior to return protection is not that good a thing.
I could be completely wrong here and am looking for input
Any thoughts??