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4CHAPITRE 4 PAGE 06 EVACUATION 3 - When the system is confirmed to be leak-tight, release the OFDN and immediately connect a proper vacuum pump to both suction side and discharge the side of the compressor (see diagrams), and make sure the vacuum gauge is connected. Open all the valves, including solenoid valves, so there is no part of the circuit that is “locked” in. 4 - Switch on the vacuum pump and wait. 5 - When satisfactory vacuum has been reached (below 100 Pa abs.) stop the pump and leave it for an appropriate length of time (around half an hour for a small hermetic system, to several hours for a large site-installed system) to see if the vacuum gauge indicates an increase in internal pressure. If the pressure rises there could be two reasons for it: either there is a leak or moisture still in the system. In this case, the evacuation procedure should continue, but if a constant vacuum pressure is never achieved, then it is likely that a leak is present and the tightness test should be repeated. 6 - If the vacuum pressure remains constant over a period of time, the circuit is correctly evacuated; dry and free of leakage. Procedures to perform evacuation To evacuate and dehydrate a system, before filling with refrigerant, take the following steps: 1 - First, the system should be tightness tested (i.e., “leak tested”). This can be done by pressurising the system with oxygen free, dry nitrogen (OFDN). Shut off the supply of nitrogen and check the pressure over a period of time (a minimum of 15 minutes, but it depends upon the size of the system; a larger system requires more time). Keep checking the pressure gauge to see if the pressure reduces. 2 - If the pressure does fall, it is likely that the system has a leak, so leak searching and repair procedures must be carried out. Servicing Practices OPEN Vacuum pump connexion 92 OPEN OPEN Exhaust Vacuum PumpPDF Image | Manual for Refrigeration Servicing Technicians
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