Vacuum pumps are component of one of the final processes in the repair procedure. After you’ve diagnosed and repaired any leaks or Ac Vacuum Pump various other issues in the system it is time to recharge. Before recharging you want to make sure the machine is free of any undesired gasses, air, or drinking water. If these were to stay in the system, it would turn the 
oil it operates on into sludge and leave behind damaging impurities.
The draw on a vacuum pump is usually broken down into its “CFM,” or Cubic Feet each and every minute. To estimate what your CFM requirements, consider the tonnage of the systems you work on. Take the sq . root of that amount and you’ll obtain the approximate CFM you must have to work with that system. Typical residential systems need 4-5 CFM, while industrial and rooftop systems generally require just as much as 6-8 CFM.