Xylem 19 001 251 R3 Floboy VFD Pumping System - Manual (Page 16)

12
DISCHARGE PIPING
Like the suction assembly, the discharge piping
requires adherence to certain rules and conditions
in order to minimize future problems. The following
list should be observed when designing and
installing the discharge assembly:
A. Discharge pipe should be constructed of
screwed or welded steel pipe.
B. The piping should be constructed in a Z"
configuration with 45 or 90-degree elbows.
The elbow located underground must be
protected against movement by a
concrete thrust block. The concrete form
should be positioned on the station side of
the elbow so that pipe movement is
prohibited in that direction. At least ½ yard
of concrete should encase this elbow and
extend to the virgin soil surrounding the
elbow and pipe. Please note: piping must
be supported properly prior to pouring the
concrete thrust block in order to ensure
piping strain is not present at the pump
discharge. Piping train on the discharge of
the pumps station can be checked in the
same manner as the suction piping strain
described earlier.
C. Connecting the steel pipe to PVC mainline
should be accomplished with a gasketed
transition coupling. Solid connections,
such as flanges or screwed fittings, should
be avoided. Transition couplings are
available at most irrigation supply houses.
Figure 8: Proper installation of pump
station discharge.
ELECTRICAL CONNECTIONS
The pumping system is pre-wired at the factory
and includes all internal wiring necessary to
function. For relay start systems, the customer
must still wire any external controllers and devices
to the relays inside the control panel. The only
electrical connection required in the field is the
main disconnect located in the station control
panel. Electrical cables from the power company's
meter or distribution panel are to be connected to
the top lugs of this main disconnect panel.
DANGER
Electrical wiring poses the danger of
hazardous voltage. Contact with live
electrical connections can cause shock,
burns or even DEATH. All electrical
connections should be made by a qualified
and licensed electrician and then inspected
by local code compliance authorities.
All electrical connections in the control and
disconnect panels are tightened prior to the
pumping system leaving the factory. However,
these connections can become loose during
transit and must be checked before energizing the
pump station. Your electrician should be
requested to perform this task and should be
directed to tighten all high and low voltage
connections, terminal strips and power lugs.
It is important to ground the station properly as
required by code. The electrician installing the
incoming power cables should also provide this
ground connection inside the main disconnect
panel.
CAUTION
In order to ensure the proper operation of the
station's electrical surge control devices it is
important to install proper grounding close to
the station.
The power company's grounding alone may not be
sufficient and additional ground rods may be
needed to ensure adequate protection. The quality
of this ground should be checked by a factory
certified technician or electrician and should not
exceed 20 ohms resistance.