I have a larger chilled water plant with 2 chillers and many motorized valves to operate in any configuration ( either one stand alone or series with either one being lead ). This is a new start up and it was all running when I first got involved two weeks ago ( noticed some water on the floor then ). The programmer is telling me that he has the valves proving open before pumps can be enabled but I arrived on site the other day and found the plant down and pumps running with valves closed.
I'm thinking that a hard wired interlock is the only way to be positive that the pumps will not operate if valve positions are not correct. Thoughts on this ? System is Tracer SC .