Years ago, a serviceman installed a new pump and wired it to run
continuously when the heat circuit was on because "it's more energy
efficient as it gets all the heat into the radiators."
Well the pump burned out (bearings) and I installed a new one. But I
would like to have the pump run ONLY when heat is called for.
The boiler is and old, old American Standard 100000 Btu and the
thermostat is programmable. How can I change it so the pump runs only
when heat is called?
You have to describe the entire system. Is this the only circulator, or are
there others. Does the system use zone valves?
Typically you would have a low voltage thermostat energize a switching relay
that sends power to a circulator, and to the burner, but it all depends upon
the components of the system
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