To trace the cause of a trouble if it occurs during automated address setting by providing displaying means that displays the state of the progress of setting during the automated address setting.
A displaying means 101 that displays the state of the progress of setting during the automated address setting is provided. A command controller 100 is arranged to a heat source unit 3 and a displaying means 101 is arranged to a command controller 100. User side units 4 to 16 are connected to the command controller 100 in sequence through a main bus line 17a and the remaining heat source side units 1 and 2 are connected to the command controller 10G through a sub bus line 17b. As the state of the progress of the setting is displayed on the displaying means 101 during the automated address setting and if the trouble occurs, the state before occurring the trouble is displayed and the cause of it can be traced easily.
NISHIDA KEIJI
KAZAMA AKIHIRO
YOKOYAMA MASAO
DOBASHI MITSUHIRO
