Franklin Electric VERSAJET VJ07 Série Manuel D'utilisation page 3

suction tapping.
A jet pump performs best when installed close to the well
because suction lift and friction losses are kept to a
minimum. Although an installation near the water source
is preferred, it may be necessary or more convenient to
locate the pump away from the well, lake or stream. FOR
A SHALLOW WELL INSTALLATION, the offset is
limited only by the suction lift and the friction in the
plumbing system.
Plan your piping layout before starting the installation so
that the correct pipe and fittings are on hand to complete
the job. Keep the pipes clean, since pebbles and other
foreign material can block the injector or pump impeller
and hinder operation. To avoid air pockets slope
horizontal pipes continuously upward from water source
to pump by at least 1 vertical inch for every 30" of
Horizontal run.
HORIZONTAL OFFSET SUCTION PIPING
When the pump is offset from the well, the horizontal
offset suction piping may have to be increased in
diameter to reduce friction loss. The friction loss in a
system increases:
1.) As the flow rate increases
2.) As the piping size decreases
Consult included VersaJet performance tables (Appendix
II) and friction loss tables (Appendix III) to determine the
amount of head lost for a given application. Pipes from
the well to the pump should slope upward (about 1" of
rise for every 30" of run).
DISCHARGE PIPE SIZES FOR INSTALLATION
When the pump is located at a distance from points of
water use, it is necessary to increase the discharge pipe
size in order to reduce friction loss. The friction loss in a
system increases:
1.) As the flow rate increases
2.) As the piping size decreases
Consult included VersaJet performance tables (Appendix
II) and friction loss tables (Appendix III) to determine the
amount of head lost for a given application.
SHALLOW WELL INSTALLATION (FIGURE 1)
Connect pump to well as shown in Figure 1. Shallow well
operation, suitable for depths not exceeding 25 feet,
requires only a single pipe to the water source. Typical
water sources are wells, lakes, ponds, streams, or rivers.
Support the suction pipe, so its weight is not carried by
the pump. Installation should include a foot valve in the
well or a check valve close to the pump. If the distance
from the well to the pump is more than 40 feet, a check
valve (installed close to the pump) is recommended in
addition to the foot valve. The choice of using a check
valve at the pump or a submerged foot valve depends on
the individual installation parameters. A check valve is
necessary for pumping from a drive point well where the
suction line is driven into the ground to extract the
surrounding groundwater. A foot valve is more suitable
2
FIGURE 1 - SHALLOW WELL INSTALLATION
for a cased/dug well. Either can be used for pumping
from a lake or stream, provided the end of the suction
pipe is also protected by a strainer. Special care should
be taken to ensure that all suction fittings are tight and
sealed. Otherwise, the pump cannot be primed or will
lose prime over a period of time.
DISCHARGE PLUMBING (FIGURE 2)
This arrangement is typical and suitable for any pipe
material, but the system shown is not required for proper
use. The gate valve saves draining the entire system
when servicing the pump. There should be unions or
other breakable pipe connections close to the pump to
allow for easy accessibility when servicing.
PRESSURE SWITCHES & JET NOZZLE
INSTALLATION
This pump is shipped from the factory with a standard
pressure and flow Jet Nozzle installed. The pressure
switch is preset to accommodate the expected pressure
range associated with this nozzle. All pressure switches
are preset at the factory for proper performance and do
not usually require adjustment. If adjustment is
necessary, the switch should be adjusted according to
the switch manufacturer's specifications. General
guidelines are provided below. PRESSURE SWITCH
MODIFICATIONS MAY BE NECESSARY, if the optional
Jet Nozzles are installed. Information on installation of
the high flow or high pressure Jet Nozzles can be found
in the product flyer (Number 106210101), entitled
"Changing Pump Performance". The information is also in
this owner's manual section entitled CUSTOMIZING
PUMP PERFORMANCE.
1-1/4" Suction Pipe
Sanitary
Well Seal
Well
1-1/4"
Foot Valve