I have about 38-ton of Liebert cooling - all glycol condenser cooled.
The building operates a 24x7x365 loop with roof top cooling towers.
I am on the 1st floor, and for the past 2 years have been struggling with limited flow. We've compensated the limited flow by lowering the loop temp, so my glycol exit temp for most Lieberts is around 95-98 degrees (it used to be 105-110).
Here is the problem, because flow is so poor, from time to time, little hiccups happen. The problem is those hiccups cause major issues for me. Last week for example, we think a small air pocket hit the 1st floor pump and caused momentary loss of flow. Well, that short loss of flow was a major issue for me and ALL my units went into high head pressure alarms.
The problem is the Lieberts have to be manually reset when they hit high head pressure, someone physically has to push the reset button on the switch by the compressor. This is a data room, so if nobody is around its a major issue.
I am brainstorming on ways to implement something that would allow me to remotely (over the wire) reset the high head pressure switch. Does any manufacture make a head pressure switch the automatically resets after 5 minutes, or automatically resets after the pressure return to normal ranges.
The only idea I have so far is messing with the control wiring. The high head pressure switch is either normally open or normally closed (not sure which), when it goes off its just closing or opening that circuit. I could override that with a controllable relay circuit.