推荐回答（4个）
压缩机低压保护，多数是因为压力保护开关设置的数值不合理导致的。
特别是由多台压缩机组成的并联机组，当并联机组控制器检测到传感器的压力数值低于设定压力时开始执行停机程序。如果此时把两两压缩机之间的停机间隔设置的略长，而等到最后一台压缩机停机之前，压缩机吸气压力数值已经低于机械压力开关设置的保护压力，造成低吸气压力报警。
对于在试运行结束后已经在正常运行状态下的机组，也是会经常碰到这个问题。对于这个时期出现的问题一定要亲自去测量安装在回气管路上的过滤器前后的压力降，准确得出压缩机进口处的吸气压力数值。
如果经过吸气过滤器的压力降过大，必须更换新的吸气过滤芯。如果仅仅是错误的调整机械压力保护开关的数值，会让压缩机进口过滤器前后的压差越来越大，过滤器后的吸气压力越来越低，大大降低压缩机的工作效率，增加压缩机运行的故障风险。
扩展资料
压缩机被看成是制冷系统的心脏，最能表现压缩机特征的专用名词称为“蒸气泵”。压缩机实际所承担的职责是提升压力，将吸气压力状态提高到排气压力状态。
压缩比是压力差的一种技术表示方式，其含义为高压侧绝对压力除以低压侧的绝对压力。压缩比的计算必须采用绝对压力值。
为了避免使压缩比计算值出现负值，计算压力比时必须采用绝对压力，而不是表压力。采用绝对压力值才能使压缩比计算值为正值，这样才有意义。
制冷和空调行业中采用的压缩机有5大类型：往复式、螺杆式、回转式、涡旋式和离心式，其中往复式是小型和中型商用制冷系统中应用最多的一种压缩机。螺杆式压缩机主要用于大型商用和工业系统。回转式压缩机、涡旋式压缩机主要用于家用和小容量商用空调装置。
各种往复式压缩机一般根据压缩机壳体形式以及驱动机构设置方式分类。根据壳体形式来分有开启式和封闭式半封闭式压缩机。封闭式是指整个压缩机均设置在一个壳体内。
参考资料来源：百度百科-制冷压缩机安全保护
低压保护，意思就是系统管低压部分不在设定运行的范围值内就会跳保护了。 至于原因就多种多样了。
首先开机先检测系统管。 看看节流前后和过滤前后有没有温差变化或者结霜现象。一般这两个地方一堵就跳低压保护。没事就看电控方面，是不是低压保护开关坏了，或者电控主板出问题了。 如果还没问题就看看 低压多少高压多少， 是不是制冷剂不够了。
常用的是高压保护，一般是散热不良，需检查散热风扇和冷凝器翅片的清洁
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