Many HVAC systems are equipped with 100-percent-outdoor-air economizer cycles consisting of a set of dampers that steer cool outdoor air to fans, which then move the air around the system. The purpose of an air economizer is to reduce refrigerant-compressor run time during colder months and possibly during cool night hours and, thus, lower annual energy consumption. Many variable-air-volume (VAV) systems are designed with incompatible and/or incomplete control strategies that undermine the ...
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