If an air conditioner is installed correctly, it should never need to be recharged with gas. As there is no stale gas or expired gas left in the system, gas needs to be recharged only when there is a leak in the system, which must be confirmed and fixed only by a qualified service technician.
For more information, you can also contact Fujitsu Assist at fujitsuassist@fujitsugeneral.com.au or call us on 1300 364 484.