Gorman-Rupp Pumps 84A2-F3L 1348524 and up - Manual (Page 11)

OM−00900 80 SERIES
PAGE B − 4 INSTALLATION
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.
Standard floats are equipped with 50 feet (15,2 m)
of cable.
When installing the floats, note the following:
a. Be sure to provide sufficient room in the wet
well or sump so that floats do not get ob-
structed or drawn into the suction line. If a flex-
ible suction hose is used, it may be extended
to lay along the bottom of the wet well or sump
and the float can be attached to the hose
above the point where it bends along the bot-
tom. Direct the suction line toward the flow,
and the float(s) away from the flow. If a stand-
pipe is available, attach the float switch cable
to the standpipe in the sump at the approxi-
mate desired liquid level.
b. In a single float system, the cable can be teth-
ered to the suction line or standpipe approxi-
mately 6 inches (152 mm) above the float.
This setting allows approximately 9 inches
(229 mm) of liquid rise between pump start/
stop. The start/stop interval may be increased
by extending the float end of the cable. The
liquid level in the sump will increase approxi-
mately 8 inches (203 mm) between start/stop