The system has to be recovered prior to doing this, if you system is empty all ready your ok as you have no R134a in the system otherwise have the system recovered and reuse the R134a gas that was in your system.
Next set up your A/C Manifold gauges as usual , connect high a low pressure quick fit connectors and make sure all connections are tight and not leaking .
Then connect the yellow centre hose to your vacuum pump, this vacuum pump has a solenoid valve to hold the vacuum well even after turning the pump off.
When you turn the pump on you may see mist come out of the outlet of the pump, the blue lid. This is the moisture from inside the system being evacuated and burned off under vacuum.
Pull the vacuum down to -30 PSI and then turn machine off the solenoid will hold the seal, your system must hold a vacuum for 30 mins at least if not you have a leak and continuing would be a waste of time.
If you hold a seal then its good to progress, you need to turn on the pump and let it keep pumping for 45 mins to completely evacuate and burn off any moisture within the system.
Then turn it off and let the vacuum hold for another 45mins to make sure the system is perfectly evacuated and ready to top up, any moisture or air in the system will negatively affect the air conditioning so its important to take these steps.
The gauge on the vacuum pump on this unit is in mbar and very sensitive to pressure changes making it much more visible to see even minor leaks.
See video below for full details on this process
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