i recently ran a call at a chain store that we all know. it was for ac no cool in the back room/office. there is two reach in coolers, 1 reach in freezer, 500 lb ice machine also some computers a dishwasher and hot water heater. there are to 5 ton systems at this store. one does only front of the house and 1 is split between the front and back. there are 2 16 in flex returns 1 in the back and one out front. there are 2 12 in supply ducts in the back room and 3 16 in supply ducts out front. originally when i went out i found they had a lightsat that was in holdback because they had books in front of it. for those unfamiliar with these they sense light and when the lights are off they go to unoccupied mode.
as soon as i removed the books the system came on and had a 20 degree td. went to roof and system was operating properly. i left the call open as i knew i had to come back for maintenance the next day. when i arrived the system was still at 81 degrees but also still running. i closed a supply damper in the front room to push air to the back and preformed regular maintenance.all checked ok. i reccomended that we do a heat load calculation to determine how many cfm of air is need to cool this area.and told them we would be back to do this. today while on another service call i was called and this room was at 96 degrees. another tech ended up out there and he found the condenser fan off due to blown run cap thus the ompressor was cycling on head prerssure. so long story short i got ripped a new one by this tech saying i didnt do it right and there is no problem with ducts. when i was on pm i looked and all looked good cap was not blown at that time and everything was running. just give me your opinion and be honest.i hate getting recalls and this will bother me for weeks. should i have done something diffrent.