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Figure 7.31 Remove vacuum pump and gauges (C) Figure 7.32 Progressively release the vacuum • Progressively release the vacuum by opening both the liquid and gas side isolation valves using the valve core removal tool by turning it counter clockwise a 1⁄4 turn (Figure 7.32) so that air is not introduced into the system. • Replace both liquid and gas valve caps and gas service port valve caps and tighten using an adjustable wrench (Figure 7.33). If a valve cap cannot be finger-tightened first, do not force- tighten it, as this may strip the thread – instead, remove and refit the cap. The caps must be securely fastened to prevent refrigerant leakage from the system. Figure 7.33 Tighten valve caps Do not use refrigerant to purge air from pipes. Evacuation methods specified in the Australia and New Zealand Refrigerant Handling Code of Practice 2007, Section 6 are set out in Tables 7.1 and 7.2. New installations may be evacuated using the single step evacuation procedure (Table 7.1). These evacuation procedures apply only to the pipework installed on site – not manufacturing process pipework. Table 7.1 Single step, deep vacuum method Table 7.2 Triple evacuation method Step Process 1 Evacuate the system to 200 microns of mercury. 2 Isolate vacuum pump. 3 Allow system to stand for 60 minutes. Test for leaks in vacuum not maintained – if the gauge rises by 50 microns or more, then there is a leak or moisture in the system. 4 Ensure that vacuum is maintained at or below 250 microns of mercury. Step Process 1 Evacuate the system to at least 500 microns of mercury. 2 Break vacuum with oxygen-free nitrogen (OFN). 3 Allow system to stand. 4 Re-evacuate the system and repeat the process using OFN to break the vacuum. 5 Repeat procedure for a third time. 44PDF Image | Heat pump installation Good Practice Guide
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