Help Needed about SMD Rework Station

Hello There,

i just got myself an old SMD Rework Station Without a manual and i don't know How To Use it for Soldering / Desoldring Without Damaging the Components or the PCB and am Also Don't Know How To Set Ranges For Every Component Can Someone Help by Explaing or Direct me to Link for How to Use it .

These Sections are in The SMD Rework Station :
Air Range : 1 ~ 8
Heater Range : 100 ~ 600
Temperature Range : 200 ~ 480 C / 292 ~ 896 F

Thanks in Advance .