Power to the server room A/C units was temporarily shut off during a renovation. When two of the three Cantal units failed to start up they called us in.
Things really started to heat up by the time I found the problem. The three units were wired up together with one master and two slaves. When power was turned off the master unit went back to factory settings. I just reprogrammed the controls to operate the additional units.
The return air to the units was so hot that it tripped out on high head pressure once or twice. No big deal. The room cooled down soon after.
