4
always be submerged during the
pumping cycle. The second
or turn-on control is set about
24 inches above the lower
turn-off control.
More distance between turn-on
and turn-off controls can be used,
but sewage may become septic
and excessive solids may collect
for the pump to handle. A
frequent pumping cycle is
recommended for best operation.
If an alarm system is used, this
control is usually set about 6
inches above the override control.
Some engineers as described
previously prefer to have the
alarm control set below the
override control.
amps on the motor housing. The
amp draw on these submersible
motors is slightly higher than
a corresponding horsepower
surface motor so heaters must be
sized by the nameplate rating.
Single phase pumps with
capacitor start have a run and a
start winding each drawing a
different current. To adequately
protect these windings with
the appropriate heaters, consult
the factory.
IMPORTANT: If other than
Hydromatic starters are used,
be sure the heat sensor wires are
connected in series with the
starter coil circuit. Typical
wiring diagrams are included.
Hydr-O-Rail:
If the pump or pumps are to be
used with Hydr-O-Rail system,
the pumps will be equipped with
guide brackets and hydraulic
sealing flange.
check valve the line pressure can
be cut off. Single pump systems
are sometimes installed without a
check valve where it is desirable
to self-drain the discharge line to
prevent freezing. This can be
done only with short discharge
lines, otherwise water will return
to the sump and cause short
cycling of the pump.
NEMA 4 Junction Box
(Optional):
If electrical control panel is to be
set remote from the pump sump, a
NEMA 4 junction box should be
used to make power and control
connections. The Hydromatic
NEMA 4 junction box is provid-
ed with compression connectors
for sealing all wires. No sealing
compound is needed to make
connections waterproof.
Wiring diagrams are provided
with the panel for making
connections. An extra set of
diagrams is included so that one
set can be used in the sump when
making connections. The size
wire to use from panel to sump
depends on motor size and
distance in feet.
Be sure each wire is checked out
so that a wrong connection will
not be made.
Installing 3900 Mercury
Switch Controls:
The controls are supported by a
mounting bracket that is attached
to sump wall or cover or to the
NEMA 4 junction box.
Cord snubbers are used to hold
the cord in place. Control level
can be changed at any time
by loosening the snubber and
readjusting cord length.
In either simplex or duplex
system the lower or turn-off
control is set just above the top of
volute so that the volute will
Installation
Instructions
Installing Pump in Sump:
Before installing pump in sump
lay it on side and turn impeller
manually. Impeller may be
slightly stuck due to factory test
water so it must be broken loose
with small bar or screwdriver in
edge of vanes. The impeller
should turn freely.
Clean all trash and sticks from
sump and connect pump to piping.
A check valve must be installed
on each pump. A gate or plug
valve in each pump discharge line
is also recommended. This valve
should be installed on the
discharge side of the check valve
so if necessary to service the
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