Can someone give me some general tips for setting water reg valves on water cooled units? Specifically, what sort of delta T are we looking for? What sort of condensing temps/pressures? My incoming water temps to the condenser are very low, being fed from a building chiller. So, we're running around 48 degrees! The unit in question was originally on city water, which was around 55-60 degrees. I find my evap is freezing now, and I have to adjust the reg valve accordingly to bring up my leaving water temps and head pressure.
Is there a general rule of thumb you can give me for setting reg valves?
It's R-22 system, btw.