Hi Guys!

I am looking for some advice on how pressure switches should be set. I am working on a system with a freezer room and cold room. Freezer set point -20 and cold room set 4 degrees. The compressor has capacity control (50/100%). The gas is R404a (30kg).

The suction pressure is always around 1 Bar until it reaches temperature and pumps down.

LP switch is set for 1 bar with a differential of 1.
The capacity control switch is set for 2.5 bar with a differential of 0.5.

Can anyone tell me if these are the correct settings? I am relatively new to the trade. My understanding was that if its running around 1 bar it should be on @ 50%. Then if the suction pressure was to rise (for example) to 3 bar it would kick in to 100% capacity again to bring it back down to 1 bar?

The system always runs at 100% capacity no matter what, i don't think this is right?

Any information appreciated, Thank you.