PURPOSE: Each of the indoor units is separately made to be independent from the outdoor unit by connecting the outdoor and indoor units by two DC signal lines and by performing the transmission of signal and the receiving of signal and thereby a cooperative relation can not be made in the indoor unit.
CONSTITUTION: Outdoor unit control device 1 is consisted of the data transmission and receiving circuit 11, signal transducers 12 and 13. The first and second indoor unit control devices 2 and 3 are comprised of the signal transducers 21 and 31, and data transmitting and receiving circuits 22 and 23. The data transmitting and receiving circuit 11 in the indoor unit control device 1 is comprised of the first indoor data receiver 11a, the indoor data transmitter 11b, the second indoor transmitter 11c and outdoor data transmitter 11d. Signal transducer 12 is comprised of the photo-couplers 12a and 12b. The signal transducer 21 in the first indoor unit control device 2 is comprised of the photo-couplers 21a and 21b.
NAKAHARA SEIICHI
UCHIYAMA KOUJI
