Matsushita Electric Industrial Co., Ltd.

Keiichi Kuriyama

Koji Taniguchi

Masahiro Watanabe

Takashi Deguchi

Katsumi Fukuda

Mitsuhisa Nakai

Akira Yokouchi

Akihiro Kyogoku

Kenichiro Miura

Yoshinao Nakamoto

Hiroaki Higashi

Makoto Kaibara

A circuit board for surface mounting by solder flow an electronic component having narrow lead pitches, the board having a first solder leading land having a first side and located on the circuit board adjacent to a land for mounting an electronic component, and a second solder leading land located next to the first solder leading land and opposite the first side of the first solder leading land. A method for flow soldering a surface mounted electronic component on such a circuit board, wherein the second solder leading land is positioned at a rear end of the circuit board against a direction of a movement of the circuit board when the circuit board moves toward a solder flow.

Wiring board and soldering method therefor

In a temperature control system when can be operated as a heat pump, frost deposited onto an outdoor heat exchanger (evaporator) is detected by a change in temperature of the refrigerant which flows into an indoor heat exchanger (condenser), so that a sensor to detect the deposition of the frost need not be attached to the outdoor heat exchanger. The refrigerant temperature is measured at the inlet of the indoor heat exchanger, and the temperature control system is switched to defrosting operation on the basis of this temperature and various elapsed time periods if the actual heat capability of the incoming refrigerant is insufficient, detecting the temperature of the refrigerant on the inlet side of the indoor heat exchanger, namely, by detecting the temeprature at a single position. Therefore, there is no need to use the frost deposition sensor on the outdoor side, frost deposition discriminating circuit by the signal of this sensor, signal lines to connect the frost deposition discriminating circuit with the main control circuit and the like which are provided in the room, and the like, so that the circuit can be simplified.

Defrosting control apparatus for a temperature control system

A trouble detection apparatus for an air conditioner detects overcurrents occurring within a predetermined time period t.sub.2 which is a shortest time period necessary for stabilization of the compressor operation. By counting a number of occurrences of the above-mentioned detections as criteria of actual trouble, the compressor is stopped when the number becomes two or more; thereby unnecessary interruption of operation of the air-conditioner due to electric noise or a simple overload is eliminated.

Trouble detector apparatus for an air-conditioner including a counter

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Kusatsu, Japan

Keiichi Kuriyama