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7.6 Evacuation of the system Evacuation removes air, moisture and any nitrogen remaining from the pressure testing that may be present in the system. Air, moisture and foreign matter must be removed from the system as it may cause: • the pressure in the system to rise, resulting in compressor malfunction • the operating current to rise, resulting in performance loss • moisture to freeze and block pipework and valves • oil sludge build-up • corrosion of parts of the system. If new twin-insulated piping is used, moisture removal is unlikely to be necessary. Always use a specific vacuum gauge to monitor the test. Ensure that the vacuum pump is in good working order, is serviced regularly and has clean oil. (Vacuum pump oil should be replaced after 25 uses or every 6 weeks.) Ensure the vacuum pump is equipped with a backflow prevention device to prevent the oil in the pump flowing backwards into the refrigerant pipes (should power fail during the test) as this could cause major damage to the system. Procedure Carry out the evacuation according to: • the manufacturer’s instructions, or • the methods specified in the Australia and New Zealand Refrigerant Handling Code of Practice 2007, Section 6. If the system under test holds the vacuum, then a leak is not present. Where the vacuum is not held, refer back to 7.5 Leak/pressure test, then repeat the vacuum test. Figure 7.29 Remove vacuum pump and gauges (A) Figure 7.30 Remove vacuum pump and gauges (B) • Connect the vacuum pump hose to the service port valve on the gas valve. • Start the pump. • Evacuate to 200 microns measure with a specific vacuum gauge. The evacuation time will vary according to the pump capacity and the length of the tubing. Moisture removal will occur in the evacuation process when the pressure is 0.5 Torr or less. Read the gauge for a pressure reading to check evacuation – do not time. • When the required level of evacuation has been reached, close the manifold valve and stop the pump. • Allow to hold for minimum 10 minutes – refer back to 7.5 Leak/pressure test if pressure not held. • Remove the vacuum pump and gauges (Figures 7.29 – 7.31). 43PDF Image | Heat pump installation Good Practice Guide
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