Hello,

We have finished installing a closed loop chilled water system and my question is.. We are now using a bladder type expansion tank with water make up connected to the expansion line (the pipeline from the tank to loop) and the water make up passes through a typical pressure control set ( regulating valve, check valve, relief valve)
I would like to know if with this arrangement do I need a pressurization unit that receives the make up water in a tank then pump it to system?

Ps: the make up water now is provided from the domestic water supply network