How does Option P, automatic alternation work on a Booster Pump System?
For a duplex unit with two equal pumps, P1 would be the lead pump initially and then after both pumps have been stopped, the next time they are started P2 would start first. This equalizes the wear on the pumps. For a triplex unit with three equal pumps, sequencing would be the same as above but with P3 started the third time (i.e. alternation between all three pumps). For a triplex unit with one smaller lead pump and two larger equal sized pumps, the two equal sized pumps would be alternated as with a duplex unit.
