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Posted by HeatPro on November 06, 2005 at 13:07:01:
In Reply to: Re: Proper Aquastat setup? posted by Brian on November 06, 2005 at 10:54:01:
An outdoor reset control can be wired like the high limit to cut off the boiler burner so the water doesn't get hooter than necessry to put enough heat out of the radiators. Finned radiation puts out more heat as the water becomes hotter and vice-versa; so the radiation can be 'tuned' to what you need according to the weather-controlled heat loss rather than just making the water very hot every time. By removing one wire from the high limit on the 8148 and putting the wire you took off (or an extension of it) to the outdoor reset terminal, then a wire from the other outdoor reset terminal to the 8148 terminal where you took the original wire from, you will interject the reset into the high limit burner circuit.
Properly set, the outdoor reset will prevent the burner from exceeding its setting that changes with the weather. An outdoor reset control can be set to allow the burner to run at any time there is a demand to at least 120F-140F if desired so it doesn't interfere with the prioritized hot water.