Latest customer in office building with 9 AHU's all with economizer. OA at 40 degrees but 30 ton chiller running like mad. None of the economizers are operating so I go chasing control lines looking for the OA temp sensor(s).
Found these sitting on top of the duct. Inserted back into duct and most dampers switched, chiller shut down and offices cooled down.
Can't get the pictures to load. Showed all 9 OA sensors sitting next to OA air duct work just hanging in the machine room.