| 摘要 |
PURPOSE:To enable an air conditioner to provide a small local management type air conditioning system and to enable the air conditioner to perform an outdoor air cooling operation during the intermediate stage, by a method wherein a ventilating mechanism is incorporated in a fan coil unit to form an integral unit, which draws in the outside air. CONSTITUTION:When a first fan 4 is functioned as a fan for circulating indoor air, when CO2 concentration in indoor air is increased, fresh air can be introduced in a first fan 4. Surplus indoor air equivalent to an outside air intake amount is exhausted to the outside of a chamber with the aid of a second fan 12. During cooling, heat exchange is effected between the intake outside air and exhaust indoor air by means of a total heat exchanger 13, and energy saving operation can be effected. When the open air is cooled during the intermediate stage, the open air, having temperature lower than that of indoor air, is taken in as it is without heat exchange between the intake open air and exhaust indoor air. Various operation modes are switched through switching of routes 16 and 17 on the suction side to the first fan and switching of routes 20 and 21 on the delivery side from the fan.
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