Liebert CHW Control Valves

[mpeck1982]

Does anyone know why CHW control valves of Liebert CRAC units are always installed on the supply CHW piping? They are typically A-Frame coils used. This has been common for what I've been seeing in the field. I would think if a control valve is on the supply side the water would just trickle thru and not fill the coil with CHW. Anyone have an explanation?

 

[DrRTU]

I had the same question about 2 years ago. We installed as per Liebert drawings and on a variable pumping system. I had asked and did not get a good answer. The valves take a large DP.