During water supply procedure, a main pump and an auxiliary pump cooperate to operate: the main pump works constantly, while the auxiliary pump works at rated frequency when experiencing water supply shortage and stops upon over pressure. The main pump adopts variable frequency control whereas the auxiliary pump works only at rated frequency.

EN500/EN 600 series' constant pressure water supply technique is newly developed and adopted by Encom. The pressure during water supply impacts greatly on the water quality and safety indices. The constant pressure water supply solution features stable water pressure, convenient operation, reliable execution, low electricity consumption and high level of automation.