MIM-A60UN will allow control of one indoor unit with a 24VAC thermostat. A field provided 24VAC transformer is required (Samsung multi-position AHU's contain a 24VAC transformer). . MIM-A60UN connects to the F3/F4 wired controller communication line, therefore it does not need to be installed on/in the indoor unit(s). NOTE: Central controls (DMS2, DMS2.5, MIM-H03UN, MCM-A300N) cannot be used to control indoor units when using MIM-A60UN but monitoring only.