{"title":"Economizers","description":"\u003ch3\u003eWhat an economizer does\u003c\/h3\u003e\u003cp\u003eAn economizer is the assembly on a rooftop or commercial unit that brings in outdoor air for \"free cooling\" when conditions allow. Instead of running the compressor, it opens a damper to pull in cool, dry outside air, cutting energy use during mild weather. A set of sensors and control logic decide when outdoor air is suitable and modulate the damper accordingly.\u003c\/p\u003e\u003cp\u003eWhen an economizer fails, you'll notice higher-than-expected cooling costs, a damper stuck fully open or closed, spaces that feel stuffy or over-ventilated, or the unit running mechanical cooling on days it shouldn't need to. A seized damper motor, failed changeover sensor, or dead control module are the usual causes.\u003c\/p\u003e\u003ch3\u003eChoosing a replacement\u003c\/h3\u003e\u003cp\u003eMatch the economizer to the unit on these points:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eLogic type — the control strategy (for example dry-bulb versus enthalpy-based changeover) the unit is set up for.\u003c\/li\u003e\n\u003cli\u003eDamper size — the physical opening the assembly must fit.\u003c\/li\u003e\n\u003cli\u003eSensor included — whether the replacement comes with the changeover sensor or you'll reuse the existing one.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eFit and logic both matter — a controller with different changeover logic won't behave the way the building was commissioned for. Because economizer assemblies are large, they may ship as freight rather than a small parcel, so plan the delivery accordingly. Before ordering, match the model or part number on the old economizer or its controller so the damper opening and control logic line up.\u003c\/p\u003e","products":[],"url":"https:\/\/nationalhvacparts.com\/collections\/economizers.oembed","provider":"National HVAC Parts","version":"1.0","type":"link"}