MPdesign Posted April 6, 2010 Report Share Posted April 6, 2010 Hello All, I know that I have some pretty lame brain questions sometimes so why should this be any different? [:-dunce] Is it possible to tell visually if a unit has an economizer or not without opening the unit and looking inside at the damper? I have included a few rooftop package unit examples. Click to Enlarge 44.89 KB Click to Enlarge 42.09 KB Quote Link to comment Share on other sites More sharing options...
Terence McCann Posted April 6, 2010 Report Share Posted April 6, 2010 The short answer is no Joe. You can have o/a dampers that are just used for 10% makeup/fresh air into the building. If you are writing a report, and need to verify the presence of an economizer, you really should pull a panel to look and also have a peek at the wiring diagram/control logic. Quote Link to comment Share on other sites More sharing options...
MPdesign Posted April 6, 2010 Author Report Share Posted April 6, 2010 Terry, Thanks for your help. If I get a large portfolio of work in Ohio, I will definitely try to send some of it your way. Quote Link to comment Share on other sites More sharing options...
Marc Posted April 6, 2010 Report Share Posted April 6, 2010 Economizer....just can't remember what that is. Marc Quote Link to comment Share on other sites More sharing options...
MPdesign Posted April 6, 2010 Author Report Share Posted April 6, 2010 If it is cool outside but warm in the building, it opens the damper further thereby using the outside air as cooling instead of using the compressor. Also called "Air side Economizer" or "Free Cooling" The compressor may be turned completely off completely or "partially left on" for dehumidification in some instances and control schemes . Considering your last post about cleaning calipers in closed systems, I think you are just pulling my leg about forgetting what that is though. [:-thumbu] Cheers Quote Link to comment Share on other sites More sharing options...
Marc Posted April 6, 2010 Report Share Posted April 6, 2010 Ain't pulling your leg. Just forgot what it was. Here's another one: What do you mean by 'cleaning calipers'. Marc Quote Link to comment Share on other sites More sharing options...
MPdesign Posted April 6, 2010 Author Report Share Posted April 6, 2010 The forum topic on "Combination systems help". I was just paraphrasing! Cheers! Quote Link to comment Share on other sites More sharing options...
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