
3
The float is held in position in the
sump by a weight at tached to the
power cord above the float. The
cord supports the float and is
adjusted for height from the
sur face.
Duplex systems use three
controls: one set at turn-off, one
set at turn-on for one pump, and
one set for turn-on for two pumps.
Pumps alternate op er a tion on each
successive cycle.
Two pumps operate together only
if sump level rises to the third or
over ride control. The override
control also brings on the second
pump in case of failure of the first
pump. The extra float is for alarm.
Triplex systems use four controls:
one set at turn-off, one set at
turn-on for one pump, one set
at turn-on for two pumps, and
one set at turn-on for three
pumps. Pumps alternate each
successive cycle.
Three pumps operate together
only if sump level rises to the
fourth control (second override).
This control also brings on
the third pump in case of failure
of either or both of the first
two pumps.
Alarm Controls:
The alarm level is usually set
above the override level so the
alarm will signal only if the
override level is ex ceed ed.
However, some engineers prefer
to have the alarm level set be low
the override level as it is pos si ble
for one pump to fail and the other
pump to operate on the override
level with the sump level never
reach ing the alarm level. This is
par tic u lar ly true in cases of low
inflow ca pac i ty.
Ele tri al Control Panel:
Hydromatic electrical equip ment
is installed in a weatherproof
NE A 3R enclosure. The
electrical equip ment includes a
main circuit breaker for each
pump, a magnetic starter with
overload protection for each
pump, an H-O-A switch and run
light for each pump, an electric
alternator and a transformer to
provide 115 volts for control for
control and circuit and alarms.
compound is needed to make
connections wa ter proof.
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 so
that a wrong connection will not
be made. An ohmmeter or
egger can be used to check wire
continuity.
Installing Float Swit h Controls:
The controls are supported by a
mounting bracket that is attached
to sump wall, cover, or to the
NE A 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 height.
In either duplex or triplex
systems, the bottom of the lower
or turn-off control is set just above
the top of volute, so that the
volute will always be submerged
during the pumping cycle. The
second, or turn-on control, is set
about 24 inches above the lower
turn-off control.
ore 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.
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. After break ing
loose, 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 it is necessary to service the
check valve, the line pressure can
be shut off.
NEMA IV Jun tion Box:
(Optional)
This must be used with 60 and
above horsepower pumps and
with all systems if the electrical
control panel is to be set remote
from the pumps. The Hydromatic
NE A 4 junction box is provided
with com pres sion connectors for
sealing all wires. No sealing
Insta ation
Instructions