If you’ve done this research, these are the questions you are asking yourself: which local code do I need to follow? (IECC 2006? 2009? 2012?) Does this project need to meet ASHRAE 90.1? (2010? 2013?) What climate zone are we in? (4A, 4B or 5B?) Is this application exempt based on run-time or a special humidity requirement? Should we use dry bulb, single enthalpy or dual enthalpy?Īt the end of the day we can make this decision REALLY easy by just asking the question: does adding an economizer make financial sense to the owner? But trying to figure out if the local code requires one, and then trying to understand what type is required can leave you dazed and confused. Their function is to shut off the unit’s compressors and provide “free cooling” when the temperature outside is cold. Airside economizers are very simple in theory.
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