Sanyo Electric Co., Ltd.

Masayuki Kumakura

Eiji Oohashi

Keiji Nishida

Junichi Mochida

A power source miswiring detection apparatus for detecting a miswiring of wires of a power source, including a pulse generator for generating a first pulse having a pulse width corresponding to a first phase difference between a first pair of two phases of a three-phase alternating power source, and a second pulse having a pulse width corresponding to a second phase difference between a second pair of two phases of the three-phase alternating power source which is different from the first pair of two phases, and a microcomputer for detecting a third phase difference between the first pulse and the second pulse to judge whether the third phase difference is in a predetermined range, and detecting the miswiring if the third phase difference is judged to be out of the predetermined range.

Power source miswiring detection apparatus

A distributively arranged air conditioner group apparatus includes plural groups of air conditioners distributively arranged at remote locations wherein each group consists of a plurality of units on the heat source side and a plurality of units on the utilization side located remote from each other and a single signal line is used for a plurality of communication signal lines each usable for the purpose of controlling. To prevent a controlling operation from being erroneously performed at the time of an occurrence of signal interference, specific communication addresses are set to the respective units for the purpose of controlling communication among these units. The communication addresses are set for each group immediately after the apparatus is installed or at the time of starting of an operation of the apparatus by utilizing a plurality of heat source pipings extending between the units on the heat source side and the units on the utilization side for each group. For example, the communication addresses are set for each group by utilizing variation of the temperature of a heat source fluid adapted to flow through the units on the utilization side.

Growing community of inventors

Ohizumi, Japan

Masayuki Kumakura