3
pump. Extra floats with appropri-
ate controls can be supplied for
alarm functions. 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 exceeded.
However, some engineers prefer
to have the alarm level set below
the override level as it is possible
for one pump to fail and the other
pump to operate on the override
level with the sump level never
reaching the alarm level. This is
particularly true in cases of low
inflow capacity.
Electrical Control Panel:
It is recommended that the
Hydromatic®control panel be used
with all pumps as proper starter
heaters and connections for heat
sensor wires are furnished.
The electrical equipment 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
appropriate control circuit
and alarms.
Overload Heaters:
If the Hydromatic electrical panel
is not used, starters with 3 leg
overload protection must be
supplied. The heaters must be
sized in accordance with the
nameplate 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.
IMPORTANT: Be sure the
heat sensor wires are connected
in series with the starter
coil circuit.
Pump
Installation
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
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.
Installing Sump Level Control
Float Controls:
In either simplex, duplex or triplex
systems the lower or turn-off
control is to be set to maintain a
minimum level in the sump. This
level shall be no more than 3-1/4"
from the top of the motor housing
down to the surface of the sewage.
The second or turn-on control is
set above the lower turn-off
control. The exact distance
between the two floats must be a
compromise between a frequent
pumping cycle (10 starts per hour
max.) to control septicity, solids
and a slower cycle for energy
economy. This distance should be
determined by the engineer or
consulting engineer depending on
the conditions of the application.
For installation of Hydromatic
supplied level controls, refer to
your systems installation and
service manual.
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 provided
with compression connectors
for sealing all wires. No sealing
compound is needed to make
connections waterproof.
Wiring diagrams are provided with
panel for making connections.
HEAT SENSOR & SEAL FAILURE
NUMBER OF CONDUCTORS REQUIRED BETWEEN CONTROL PANEL AND NEMA 4 JUNCTION BOX
Power lines and control wires can be carried in conduit or can be underground buried cable.
System Number of Number of Number of
Type Control Wires Power Lines Ground Wires #8 Number of Number of
Sensor Wires Ground Wires
Simplex
Simplex with Alarm
Duplex
Duplex with Alarm
76162
WIRE SIZE AND MAXIMUM LENGTH (FEET) FOR REMOTE LOCATION OF CONTROL PANEL
BASED ON A 2% VOLTAGE DROP (230 VOLTS 3 PHASE)
Copper Wire Amperes @ 230 Volts*
No. D.C. Res.
AWG/M Ft. 51015202530405060708090 100 120 140 160 180 200
12 1.620 325 165 110 80 65 55
10 1.018 520 260 175 130 105 85 65
8 0.6404 830 415 275 205 165 140 105 80
6 0.410 1295 645 430 320 260 215 160 130 105 90 80
4 0.259 1025 680 510 410 340 255 205 170 145 130 115 100 85
M3 0.205 1295 865 650 520 430 325 260 215 185 160 145 130 110 90
2 0.162 1090 820 655 545 410 340 295 255 230 205 180 160 135 110 100
1 0.129 1030 825 685 515 410 340 295 255 230 205 170 145 130 115
0 0.102 1040 865 650 520 435 370 325 290 260 215 185 160 145 130
00 0.0811 1090 820 655 545 470 410 365 325 270 235 205 180 165
000 0.0642 1035 825 690 590 515 460 415 345 295 260 230 205
NOTE: For 460 volts obtain distance by multiplying by 2.0 ‡60˚C
For 570 volts obtain distance by multiplying by 2.5 ‡Rating 90˚C
* 230 volt system not recommended for above 30 to 40 horsepower. Insulation @ 30˚C Amb.
‡ Based on 3 power conductors in cable or conduit; for 4 to 6 reduce ampacity to 80% & for 7 to 24 reduce to 70%.
MSpecial junction box required for wire sizes larger than #4.
