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Chapter 2 — Product Introduction
Wireless-Communicating Models: (DR & WR)
Environment One Grinder Pumps are designed to grind and pump domestic sewage. The
grinder pumps are not designed to be small lift stations. They are not capable of handling
waters with high concentrations of mud, sand, silt, chemicals, abrasives, or machine wastes.
Environment One’s semi-positive displacement, progressing cavity pumps provide predictable
flow over a wide variety of pressures. High–torque, low–speed motors power the pumps. The
unique one–piece core assembly is interchangeable throughout E/One’s product line. These
models utilize a wireless interface between the level-sensing assembly and the motor controls.
The wireless feature utilizes a new wiring scheme between the switches and the controls, but
the basic operation is the same as the hardwired version.
Basic Operation
The grinder pump is designed to grind and pump domestic sewage. The pump is a semi-
positive displacement, progressing cavity pump. The grinder pump consists of a pump
assembly with an integral sewage grinder and shredder device. The pump traps a column of air
in the sensing column for the On–Off Pressure Switch. When water in the tank reaches the
normal turn–on level, the pressure in the sensing line opens the normally closed electrical
contact points. The Transceiver Assembly senses a change in the Switch contacts and sends
voltage on the brown wire to terminal A2 on the contactor. The contactor/relay coil is energized
and the relay contact points close, providing electrical power to the pump motor. When the
motor starts and runs, the grinder pulverizes any solids. The slurry is then pumped by the pump
rotor and stator until the liquid in the tank is lowered to the shut–off level. This reduces pressure
on the diaphragm of the on–off switch, which closes the electrical contacts in the switch, opens
the contacts in the contactor, and removes power to the motor.
In the event of a pump failure or excessive in-rush of liquid, the liquid in the basin rises and
activates an alarm pressure switch. The electrical contacts open, activating the alarm indicator
(light and buzzer). The alarm alerts the homeowner about a pump problem. The pump is again
called on to run. The pump will attempt to pump the station down to the alarm off level.
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