What is Constant Pressure?
One of the recent product success stories in the water systems industry has been the emergence of variable-speed, constant pressure products. Besides eliminating the pressure cycling associated with conventional systems, these products offer a wide range of other benefits, such as: consistent spray patterns for lawn sprinklers faster cycling for appliances more efficient water treatment built-in pump protection.
Franklin Electric’s variable-speed, constant pressure products are called SubDrive and MonoDrive. Both work the same way. That is, they use a variable frequency drive (VFD) to continuously adjust the speed of the pump and motor to maintain a constant, steady pressure. Both also use single-phase incoming power. The difference between SubDrive and MonoDrive is that SubDrive uses a 3-phase motor and MonoDrive uses a 3-wire single-phase motor. This makes MonoDrive perfect for retrofitting existing 3-wire, single-phase installations. This enables water systems professionals to retrofit a top-of-the-line, constant pressure system into an existing installation – without pulling the pump.