Hi, I guess you mean ºF, normal soldering temperatures are between 600ºF (315ºC) and 700ºF (370ºC).
850ºF is a bit too high... if you cannot regulate it just take care and try not to overheat the components, take time between solder one lead and the next one.
Some components, the diodes in particular, get pretty hot, so try to do it fast and leave it to cool down before applying more heat.