Wired 10 June 18 2015

1. Recovery phase started with cold car Where the car is cold or the A/C system has not been recently activated, the refrigerant in the car will be mostly in liquid state. This will slow down the recovery phase and some small quantities of the R134a refrigerant might get stuck in the curved parts of the system where evaporation is slower. These will hence not be recovered. Such small quantities of gas will be expelled from the circuit only during the subsequent vacuum phase, as they need the time physically required to expand and to move from liquid to gaseous state. Easy fix, start the recovery phase after the A/C system has been turned on for some minutes. 2. Leakages in the car system If during the vacuum phase the car circuit is not tight, air

can get into it and get mixed with the pump oil thus easing atomisation. Just check at the system has been correctly tightened before starting. 3. Pump oil needs to be replaced Polluted oil can no longer perform to its desired level. Periodically replace the pump oil. The vacuum pump needs to be adequately lubricated. Oil needs to be replaced every 60 hours of operation, as indicated by Brain Bee stations. WHAT ARE THE FUNCTIONS AND THE CHARACTERISTICS OF THE VACUUM PUMP? In Brain Bee Machines, the Vacuum Pump is a centrifugal vane pump, the aim of which is to extract the R134a residues and every other gas present in

the car system before re-injecting new refrigerant. Oil replacement is extremely important to ensure the ideal vacuum level is achieved and to keep the pump in perfect working conditions. We hope we have provided you with key information on this issue, and we are sure this will help you provide future explanations to customers and to increase knowledge on the A/C sector.

As always, if you need any help our Air Con team is on hand to answer any questions: Aaron McFarlane aaron.macfarlane@eurocarparts.com Cisco: 7001 - 595