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Hey guys....I recently started working on cooling towers again....I stopped due to change of company....I recently went to a no cool call in NYC...all four air handlers were off on there high pressure switches...I found the tower bone Dry....the super of the building shut off the water feed to the tower because the feed line had a major leak in it....I don't know too much about these systems like I do with other ones....but why do all the pressure gauges at the air handlers which are six stories below do not read pressure?....I know this is a open loop...should I be reading pressure?...or is it just static?....the only pressure I saw was at the supply of the pump which is by the air handlers on ground level...it was 25psi...another question is why wasnt water pouring in at the top of the tower if pump was on and water its in the pipes? And is there a way to see if the strainers are clogged ?...any insight would help....just want to get better understanding of water Cooled systems....thank you guys Paul S