Jadnashua
Retired Defense Industry Engineer xxx
This has happened a few times, in fact, it happened once yesterday and again today, while it may not otherwise happen for months at a time...
I have a boiler setup with a primary and secondary loop. The indirect comes off the primary loop on a priority zone logic controller. There is both radiant floor and hydro air zones off of the secondary loop. The indirect always gets heated when it wants.
Sometimes, while the secondary loop zones, both the hydro air and radiant loops, are calling for heat and their individual circulators are running (the indirect is NOT calling for heat), those loops do not get any heat. The boiler runs and the primary loop is hot, but the secondary loops are just plain cold.
The gap between the taps for the secondary loop are at 6" (a factory supplied part) and the primary loop circulator is running (it's on low per the manufacturer's recommendation). When this happens, if I shut the boiler down momentarily, I can hear the primary circulator stop (it's quiet while running, but you can hear it scroll down in speed to stop), and then when I turn it back on, the secondary loop draws heat and works for what may be months, or in this case, less than a day before I have to do that again.
Any idea why the secondary loop isn't pulling heat under these circumstances? There seems to be enough heat migrating into the secondary loop to keep the house from freezing, but it does cool off a lot. Noticed this after coming home after a week and it just didn't want to warm up.
I have a boiler setup with a primary and secondary loop. The indirect comes off the primary loop on a priority zone logic controller. There is both radiant floor and hydro air zones off of the secondary loop. The indirect always gets heated when it wants.
Sometimes, while the secondary loop zones, both the hydro air and radiant loops, are calling for heat and their individual circulators are running (the indirect is NOT calling for heat), those loops do not get any heat. The boiler runs and the primary loop is hot, but the secondary loops are just plain cold.
The gap between the taps for the secondary loop are at 6" (a factory supplied part) and the primary loop circulator is running (it's on low per the manufacturer's recommendation). When this happens, if I shut the boiler down momentarily, I can hear the primary circulator stop (it's quiet while running, but you can hear it scroll down in speed to stop), and then when I turn it back on, the secondary loop draws heat and works for what may be months, or in this case, less than a day before I have to do that again.
Any idea why the secondary loop isn't pulling heat under these circumstances? There seems to be enough heat migrating into the secondary loop to keep the house from freezing, but it does cool off a lot. Noticed this after coming home after a week and it just didn't want to warm up.