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Navigation:
F5 > Display Settings
(After pressing F5)
F1 / F2 > Navigate to Right / Left screens
F3 / F4 > Increase / Decrease the parameter on the selected screen
Press F5 once you are done, to get back to the regular (green) display.
If you want to run the HR3 more or less continuously you could try to do the following.
Increase Sample Time Period and Spacing. (Now it checks pressure increase every 10 minutes, if you set it to an hour, it will only check every hour)
Decrease Max Pressure Rise (Minimum pressure rise detected in buffer tank to keep the HR3 operational, if it's set lower it's more likely that it will keep running 24/7)