Originally Posted by
nyrb
Being a new chiller you should have all design information readily available from the manufacturer. Most chillers today are designed for very low approach temperatures of 0.5 to 1.0 C but there are many factors that can affect approach. Incorrect flow, load conditions, glycol, commissioning, refrigerant charge etc. Assuming you had a factory rep provide a proper startup it should all be detailed in their startup report.
The design info should tell you what design flow, differential pressure and approach is supposed to be at full load conditions and sometimes they give you part load numbers as well. Find that information and that should point you in the right direction.
The 44 and 41.9 numbers on the other post are Fahrenheit equivalents of your readings, most people on this forum do not work in metric.