PURPOSE: To control each chamber to comfortable surroundings, by mounting a compressor controlled to capacity fitting for the overall load of indoor units while increase-and-decrease adjusting the quantity of refrigerant fed in proportion to difference between room temperature and set temperature.
CONSTITUTION: A circuit of a temperature detecting sensor TH and a variable resistor VR emits signals being proportioned to difference between room temperature and set temperature. Thus, an output transistor Q2 repeats conduction and non- conduction through a switching element SBS and a transistor Q1. Consequently, a relay RY functions to open and close magnet valves 6, the quantity of refrigerant fed is controlled in response to temperature difference and distributed into capacity corresponding to each indoor unit and this device is operated. Meanwhile, the trouble of the variation of room temperature by the operation of other chambers is solved by the control characteristics of a compressor 9, which capacity is controlled being adapted to overall load, and the interior of chambers is brought to comfortable surroundings.
YOSHIDA YOSHIAKI
TANETANI SHIYOUICHI
