| 摘要 |
PURPOSE:To prevent the generation of time lag of the amount of air supply by installing an 'air supply control device which stops the operation of the air supply device when 'a high pressure in a refrigeration cycle exceeds a setting value. CONSTITUTION:A high voltage switch 114 and a low voltage switch 115 constitute a voltage switch'' unit. When the voltage switches are operated, they are arranged to open their contacts respectively. When the high voltage switch 114 is operated and the contact is opened, an alarm signal lamp is lit up. An air supply control device 100 is connected between terminals A, B and C and terminals (1), (2) and (3) and controls the supply of three-phase AC power to an electric motor. When an open air temperature drops and the pressure in a high pressure side in a refrigeration cycle fails to exceed 7.5kg/cm<2>, the operation of the electric motor 64 is suspended and it is so arranged that the high voltage is prevented from lowering more. This construction makes it possible to prevent an excess rise/an excess drop of the high voltage. It is, therefore, possible to perform air supply control without detecting an open air temperature.
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