A set of three air-conditioners cool a storage building in an American sub-tropical environment. There is no heat: AC only. Cooling is signaled by switching the RED (24V) to:
- Yellow wire (cooling relay) AND
- Green wire (Fan relay)
When cooling is engaged the same 24V from the red wire is connected to both the Yellow (cooling relay) and Green wire (Fan relay).
For a given AC unit, is there any reason to not short the yellow wire to the green wire? This would simplify the controller design and reduce wiring for a set of three air conditioners.