Spoke with my boss today about one of my stores. This particular store has 9rtu's, all with economizers. About a month ago, I noticed the economizer was about 25% open on the last unit toward the back of the building. Shortly after discovering this, I talked to the main guy at the hvac servicing company that takes care of our units. He said it was designed like that to keep a fresh air supply. It didn't make sense to me considering it was winter and this was causing the front door to stay cracked open.
As I was talking to my boss today about the store, I mentioned this unit to him. He also thought it was crazy to have this unit cracked open in the winter. He called the supervisor that I was referring to earlier. He said this was not only the way it was designed (keeping fresh air), but also it was a law that all units with economizers had to remain 10-15% open at all times. Is there any truth to this or is he blowing smoke up my butt? Thanks.