I have been asked to assist in trying to come up with a method to control an exhaust fan. Currently the exhaust fan is controlled with a typical HOA except it is interlocked with another HOA controller for a supply fan. They want to keep this system intact with the option to control the exhaust fan separately when needed (supply fan would not be running). I'm envisioning a break-before-make rated switch at the supply side that would feed a separate controller for the exhaust fan. As well, I would need a similar switch at the load side to avoid back feeding. Does this sound reasonable? Anyone put together something like this before?
