| 摘要 |
PURPOSE:To increase warming capacity of a system, by supplying electricity to a series circuit composed of a coil and a solenoid for directly actuating a slide valve and a positive characteristic thermistor element when warming operation is executed. CONSTITUTION:A solenoid 27 directly actuates a slide valve for switching a refrigerant passage. A positive characteristic thermistor element 31, which is coupled with a coil 29 of the solenoid in series, is thermo-exchangeably mounted. Electricity is supplied to the series circuit of the positive characteristic thermistor element 31 of the coil 29 when warming operation is executed. With this arrangement current supplied to the coil 29 of the solenoid 27 becomes large only when the electric supply is initiated so that a valve can be switched with large suction force extracted. In addition, when the warming operation is executed, the amount of heat leakage in the 4 way valve is reduced because an amount of heat generated due to current restriction of the positive characteristic thermistor element 31 is transmitted to a valve assembly.
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