Carbon12 wrote:I was reading it that the circ would turn off below low limit before the demand would be met, the house would cool, circ would come back on at low limit and then the cycle would repeat.
The problem with that is that the boiler will get up to almost 160 but the circulator barely kicks, so my tstat never gets above 64*. If I set the Lo to 140 at least I can get to 67/68. I have noticed that when the boiler gets up to temp and the circulator does kick on, temps drop to 140 and I have to wait a while for it to go back up again ( too long) which ends up making the house cold.
Maybe, I'm reading this that the circulator is kicking off when the tstat calls for heat the the return drops the water in the boiler below the differential temp of the low limit. Then while the boiler is building back to temp, the house cools down.
Which would mean that the boiler should never shut off, and unless he has a really high mass system, eventually he should reach an equilibrium with the water in the system and then continue to heat the water until it hits the temp of the low limit of the boiler.
The only way that wouldn't happen is if A) the aquastat is messed up, or B) he loses so much heat that the water in the system is constantly cooling off faster than the boiler can heat it.
Or C) I don't know what I'm talking about....
Reading it again, I'm wondering what he means by 'the circ barely kicks'...