Should the pump keep running when the set point is reached :/
Hi - any of you geniuses know why my boiler's pump does what it does?
I'm a homeowner with a Weil McLean Ultra 230. I think it's oversized for the apartment and certainly for any one of its three zones. Combining zones and turning the firing rate down has largely solved that. But sometimes the temperature still creeps above the setpoint and eventually hits the shut-off temp, set to 170+10 right now.
Then the burner turns off, but the pump keeps running. As far as I can see this pushes 'return' water through the boiler, so the 'supply' temperature falls to that level quickly. And the burner turns on again, quickly gets back up to the shut-off temperature and I have short cycling.
The whole cycle is then 2 minutes long.
When the room gets up to the thermostat setting though, and the heat call stops, the pump and burner stop together, and the 'supply' temperature falls much more slowly. Isn't that what should happen when the shut-off temperature is reached? Seems like that would lengthen the on/off cycle. Or does the water have to keep flowing because reaching this temp is bad for the system maybe..?
Anyone?
Comments
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What series Ultra?
Which circulator? There should be at least two.
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It's Series 4.
I don't know enough to answer the question! The sytem has one pump I can see, a Taco cartridge circulator beside the boiler. If I look at the Circulators entry in the boiler settings, all are 'Off' for Priority 2. There's no HW from this boiler - there is a separate heater for HW.
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