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Precision Install 精准安装(below 150micron)
For data center air conditioning systems (especially precision air conditioners or CRAC units), the vacuum level requirement mainly depends on whether the system has a compressor (with refrigerant) and the manufacturer’s specifications. Here are the industry-standard guidelines:
✅ General Standard
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Target vacuum level:
500 microns or lower (≈0.66 mbar, ≈66 Pa)
This is the common HVAC and data center standard to ensure the system is almost free of moisture and air. -
High Standard / Best Practice:
300 microns or lower
Recommended for large refrigeration systems or those sensitive to moisture (e.g., low-temperature systems, long piping).
✅ Why 500 microns?
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A refrigeration system must be free of moisture and air; otherwise, it can cause:
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Freeze-up (ice blockages)
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Acid formation leading to compressor damage
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Reduced heat transfer efficiency
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Below 500 microns means the system pressure is close to a true vacuum, and most residual moisture has been removed.
✅ Vacuum Procedure Recommendation
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Pull down to about 1500 microns first, hold for a few minutes to check for leaks.
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Then pull down to 500 microns or lower, and hold for 10–15 minutes without rising.
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If the pressure rises quickly after stopping the pump, there’s likely a leak or residual moisture.
在数据中心空调（尤其是精密空调或CRAC系统）安装和维护过程中，抽真空的标准主要取决于系统中是否有压缩机（带制冷剂）以及厂商规范。以下是行业通用标准：
✅ 常规标准
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目标真空度：
500 micron 或更低（≈0.66 mbar，≈66 Pa）
这是绝大多数 HVAC 和数据中心空调行业的通用标准，确保系统内部接近无水分和无空气。 -
高标准/最佳实践：
300 micron 或更低
用于大型制冷系统或对湿气敏感的系统（如低温系统、长管路系统）。 -
✅ 为什么是 500 micron？
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制冷剂系统必须确保内部没有水分和空气，否则会导致：
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冻结堵塞（冰堵）
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酸性物质腐蚀压缩机
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降低换热效率
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500 micron 以下表示系统压力已经非常接近真空状态，残余水分基本被蒸发带走。
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✅ 抽真空步骤建议
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先抽到 1500 micron，保持几分钟，确认泄漏。
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再抽到 500 micron 或更低，并保持 10~15 分钟稳定（不回升）。
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如果停泵后上升速度快，说明有泄漏或水分未完全去除。