i helped a friend install an intellidyne HW+ boiler control.http://intellidynellc.com/ all went well and the boiler fired properly and the control is functioning as it should. however, when the bolier was fired, we noticed the system's single circulator was sucking air when a basement zone called for heat. home has 6 zones, one for indirect HW heater and five heating zones(copper HW baseboard). we bled the offending zone and immediately got heat. system is functioning properly as of 10 pm sunday night. my question is, how could this zone become air bound? there are no noticeable leaks anywhere and the boiler was not drained as part of the boiler control installation. its as though some of the water in this one zone, which wasn't used much in the last month, "magically" evaporated from the heating pipes. i know this sounds ridiculous but it happened. any thoughts on how the air could have gotten introduced into only one zone of the system?
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