I attended a site yesterday where 2 identical water cooled chillers (shell and Tube condensers with vsd drive comps).
1 chiller was tripping on High Motor current / high VSD temps. Whilst the other was evaporator pressure limiting.
I decided to look at the High temp issue first.
And despite the sites assurance that the condenser water circuit strainers had been cleaned only a couple of weeks previous I felt I should check them.
This is what I found-


Attachment 13842 Attachment 13843
When cleaned and re-fitted the chiller worked like a dream!
The second chillers condenser water circuit was checked and to be the same.
That too worked like a dream!
But that was evap pressure limiting?
Ok. the system discharge pressure dropped by about 1 bar from 6 to 5bar (R134a)
I think I understand what was going on.
But if anyone likes to comment it would be appreciated.
Grizzly
Ps Site have decided in the short term to increase their filter clean frequencies.
They are seriously good engineers working in a beautiful rural location.
Hence the debris Via a Baltimore Cooling Tower.