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Posted by HeatPro on January 07, 2007 at 22:10:39:
In Reply to: taco 702 settings posted by Ronald G. Scalzo on January 07, 2007 at 21:12:46:
The purpose of an outdoor reset control is to keep the boiler temp just low enough to provide the required amount of heat for a full hour in any weather. That is - if you kept the thermostat calling for heat for a full hour, the temperature ideally would stay the same as the weather changed. That the room heated more shows that the water temperature was higher than needed to maintain the room with constant circulation; which is often set that way to overcome rapid outdoor temperature changes.
The system without the outdoor reset heated in 40 minutes because the water temperature was higher than needed to keep the room heated in an hour.
The unanswered info was why the room was at 67 and then why it was raised to 71F.