Generally, you want the circulation pump running all the time. It keeps things fresh. That said, look for settings for the filter cycle. That is usually what controls the circ pump. If it is a Gecko system, there are settings for how long the filter cycle runs from continuous to something less than that.
Thanks for that, I am not to sure what make of system it is as the only visable wording is Hydroquip. But how come when I lower the temp via the control panel this circ pump goes off that is the bit I can't understand?