Le:
I'm wondering that also & still....
I'm of the thought that a 'FP' basically just sits around in the event of a fire (other than testing). And the 'jockey/pressure maintenance' pump activates to maintain the required minimum water pressure for a wet sprinkler system.
Yoop's description sounds like a domestic pressure system that kicks up the pressure for a 'high draw' on a domestic water system.
That all said, IMHO a design pro (EE/PE/Arch) should be involved with the plans & specs.
