Xylem FLOJET R7000 Mode D'emploi page 15

INSTALLATION & SERVICE INFORMATION
FLOJET 7000 Series pumps are designed for a wide range of
applications and are constructed from a selection of materials
suitable for handling a broad range of chemicals. The 5 chamber
high flow pumps are self-priming and can run dry without harm.
They are intended for intermittent duty cycles but can be run
continuously for short periods of time. The higher the duty cycle,
the shorter the expected life of the pump. Typical uses include
transfer, delivery, spraying, cooling, filtration, dispensing, and
pressure boosting.
OPERATION
To start and prime the pump, the discharge line must be
opened to allow trapped air to escape, thus avoiding the
potential of airlock. For demand models, the pressure switch
will shut off the pump automatically when the discharge
valve is closed and the pressure has risen to the switch OFF
set point. The pressure switch will restart the pump when
a valve is opened and the discharge line pressure drops to
the ON set point of the pressure switch. For bypass models,
apply power to the pump, and open the discharge valve to
expell air in the line.
DEMAND OPERATION (intermittent duty)
Pump models fitted with a pressure switch are known as
demand pumps. The pressure switch is preset to shut off
the pump motor automatically when a specific pressure
is reached, such as in closed discharge conditions. The
pressure switch turns the pump motor on automatically as
the pressure drops, such as when the discharge is opened.
Demand operation is considered an "intermittent duty"
application. The maximum intermittent duty cycle is that
which will cause the motor to reach its maximum thermal
limits. Once the maximum thermal limit is reached, the
motor must be allowed to settle to a lower (ideally ambient)
temperature, before resuming operation. Running the pump
at or near the maximum thermal limit for an extended period
of time will shorten the life of the pump and may result in
immediate pump failure. Demand pump models feature an
integral pressure switch that automatically turns the pump
off/on in response to open/closed discharge conditions.
BYPASS OPERATION (if equipped)
Models equipped with an external bypass system are
designed to pump at high pressures while at low or high flow
rates. Models equiped with bypass only must be turned off/
on manually, or by an independent control device. Models
equipped with a bypass only will continue to run until the
power is manually turned off.
The 6000 Series pumps are not recommended for continuous
duty service due to limited motor brush life. Operation at
lower pressures and temperatures, however, will extend
overall pump service life.
MOUNTING
The 7000 Series pumps are self-priming and may be located
above or below the water supply in a dry location. To
vertically mount these units, it is best to do so with the
motor on top. This will prevent water dripping on the
motor in the event of a leak. Place pump on a solid surface
and secure with the four mounting screws; be careful not
to compress the rubber grommets, which act as vibration
dampers.