For KFR type air-conditioner, if refrigeration normal, not heating, its fault mainly in four electromagnetic valve or its control circuit.
对于KFR型空调器，若制冷正常，而不制热，其故障主要发生在四通电磁阀或其控制电路。
This paper describes the stability of control loop consisting of refrigeration evaporator and thermostatic expansion valve. It may directly influence refrigerating efficiency and operation safety.
分析热力膨胀阀和蒸发器调节系统的稳定性，它直接影响着制冷效率和运行安全。
By using electronic expansion valve, combining with novel control methods, optimum control of refrigeration system and high energy-saving effects can be realized.
配合新型控制方式，可以实现制冷系统的优化控制和大幅度地提高节能效果。
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