On your gauge manifold inspect all seals, valves and connections and replace/repair as required
Remove all of the old oil from your Vacuum pump, flush through with fresh oil and then recharge the pump with vac pump oil
If necessary you can run the pump with the valve closed to warm the pump and oil up, drain and flush with fresh oil before again filling.
To check the operation of the vacuum pump fit a calibrated vacuum gauge to the inlet and achieve the lowest pressure possible. Isolate the pump and watch for any rise in pressure. This may indicate a faulty pump or connection.
Preparing the system for evacuation
Ensure the system being evacuated is not at a positive pressure and connect your vacuum pump to the system, preferably on both the low and high side of the system.
Fit a calibrated vacuum gauge to the system, as far away from the vacuum pump as possible.
Ensure that you have opened all valves on the system and that service valves mid seated.
Switch on the vacuum pump before opening the manifold valves.
Operate the pump with the gas ballast open until a reading is indicated on the vacuum gauge. Close the ballast and run until the required vacuum has been achieved.
Isolate the vacuum pump and record the pressure. A rise in pressure generally indicates a leak or that moisture is in the system.
If no rise is shown you can introduce O.F.N. into the system until it reaches just above atmospheric pressure, this will help to absorb any remaining moisture.
Repeat the process as above until a last (Third) vacuum has been achieved.
Isolate the vacuum pump and hold the vacuum for as long as you can to ensure that no moisture is in the system and the system is leak free
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