307D, 311D, 312D, 313D, 315D, 318D, 319D, 320D, 323D, 324D, 325D, 326D, 328D, 329D, 330D, 336D, 340D, 345D, 349D, 374D, 390D and M325D Excavators Air Conditioning and Heating Caterpillar


Pressure Switch (Refrigerant Pressure Cutoff)

Usage:

325D L A3R



图 1g01129559

(10) 高/低压力开关

高/低压力开关 (10) 用来检测冷却回路中的高压和低压。

高压

当压缩机和膨胀阀间的压力异常升高时,高/低压力开关 (10) 通过切断压缩机电源保护回路。

低压

如果压缩机和膨胀阀间的系统压力异常下降,则表明制冷剂泄漏。 高/低压力开关 (10) 通过切断压缩机电源保护回路。 在制冷剂发生泄漏的同时也会损失压缩机油。 压力开关有助于防止压缩机由于缺少压缩机油而卡滞。

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