Gorman-Rupp Pumps 04B3-F4L 1316966 and up - Manual (Page 11)

OM-01216 0 SERIES
PAGE B - 4 INSTALLATION
If there is a liquid flow from an open pipe into the
sump, the flow should be kept away from the suc­
tion inlet because the inflow will carry air down into
the sump, and air entering the suction line will re­
duce pump efficiency.
If it is necessary to position inflow close to the suc­
tion inlet, install a baffle between the inflow and the
suction inlet at a distance 1‐1/2 times the diameter
of the suction pipe. The baffle will allow entrained
air to escape from the liquid before it is drawn into
the suction inlet.
If two suction lines are installed in a single sump,
the flow paths may interact, reducing the efficiency
of one or both pumps. To avoid this, position the
suction inlets so that they are separated by a dis­
tance equal to at least 3 times the diameter of the
suction pipe.
Suction Line Positioning
The depth of submergence of the suction line is
critical to efficient pump operation. Figure 2 shows
recommended minimum submergence vs. veloc­
ity.
NOTE
The pipe submergence required may be reduced
by installing a standard pipe increaser fitting at the
end of the suction line. The larger opening size will
reduce the inlet velocity. Calculate the required
submergence using the following formula based
on the increased opening size (area or diameter).
Figure 2. Recommended Minimum Suction Line Submergence vs. Velocity
FLOAT SWITCHES
Installation
The standard pump is not furnished with a means
to automatically regulate liquid level. However, if
the unit is equipped with the optional auto‐start
control system, the pump can be conformed to
start and stop as the liquid level in the wet well or
sump rises and falls. The autostart option employs
either a single or double float switch system, where
a bulb raises or lowers (floats) with the liquid level,
thus activating an enclosed miniature switch. The
floats are equipped with a socket type connector
that plugs into a matching receptacle on the auto‐
start control box.