Hello, I still in school and working for Burger King Stores, in my store we have about 5 units on the roof. For some reason they freeze up when the A/C is running too long over night if some rooms have heat on and the other side have A/C on. I know the problem kind of, they have them set on auto for both cool & heat mode and the fan as well. I been told the reason is that because of this. They must be set to auto on the heat & code mode, but the fan must be set to on all the time in order to stop from freezeing. I not too sure why this would cause to freeze two units up. But my store manager always get them froze up to where it won't run anymore. Is there some kind of switch that locks out the compressor and fan from running when it freezes up? How can I unfreeze the two units as they won't run and it getting warm in the dining room.
I would thank for any help.