Just a note about the 850D. I had commented that the pump was very loud, but after reading through the manual and attempting to translate it with optical character recognition (and mostly failing), I realized that the pump appears to be secured to the case with an extra screw for transportation in addition to the rubber grommets holding it into the case. If I understand the manual correctly (trust me, I don't) the screw is meant to secure the pump while it is being shipped, but is supposed to be taken out afterwards or else the pump will vibrate the case of the whole station. I took the screw out and suddenly it got WAY quieter.
Here is the completely gibberish translation I got for this:
"Use before work
L loose diaphragm pump screw pump screw
Loose 85oD breasts at the bottom of the pump snail
Bing silk (Mleo Department I color). No play can be alfalfa
Caused by heavy weight week o b
Pump screw two
Pump Securing Screw
2 lotus wandering the spirit of the mine with the size of the match from the copper soul
The FP puller is equipped with a small thunder gland (l4 mm), but may need to be raised
(30 mm). The eye in accordance with the size of the thunderbolt,
3 succeeded in collecting the snow buried in the size of the pupil with the pupil"