brand new rtu i encountered recently. the company i work for didn't install this. the remedy for lack of heat was a breeze to diagnose. the idiots who installed & set this thing up r known residential scum/crooks/hacks but i didn't even know they did commercial. they def had no concept on how to set up an economizer. while there i found a few things i wrote up including the pic ... how long into cooling season do u think it will take for a big $ repair?