4
Pump
Installation
current. Double check that all
wiring is properly connected and
tight. NOTE: On single phase
pumps the white, black and red
pump wires must be connected
properly to the panel. Only the
proper sequence will work.
Installing 3900 Mercury
Switch Float:
The float cords 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. Float 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 float
is set just above the top of volute
so that the volute will always be
submerged during the pumping
cycle. The second or lead/on float
higher is set at 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.
Making Electrical Connections:
All electrical wiring must be in
accordance with local code, and
only competent electricians
should make the installations. A
set of prints is included for use in
making the installation. All wires
should be checked for grounds
with an ohmmeter or Megger
after the connections are made.
This is important, as one
grounded wire can cause
considerable trouble.
IMPORTANT: If equipment
is not properly wired and
protected as recommended, the
motor guarantee is void.
NUMBER OF CONDUCTORS REQUIRED BETWEEN CONTROL PANEL
AND NEMA 4 JUNCTION BOX
System
Number of
Number of
Number of
Type
Control Wires
Power Lines
Ground Wires #8
Simplex
3
3
1
Simplex with Alarm
5
3
1
Duplex
5
6
1
Duplex With Alarm
7
6
1
WIRE SIZE TABLE
FOR REMOTE LOCATION OF CONTROL PANEL LENGTHS ARE BASED ON A VOLTAGE DROP OF TWO PERCENT
Maximum length in feet from NEMA 4 junction box to control panel. For 3 phase only and for power lines only. All control wires can be = 14–16 or 18 gauge
wire. If power lines are for 460 or 575 volts insulation of control wires must be for this voltage if used in conduit with power lines.
Volts
230 460 575 230 460 575 230 460 575 230 460 575 230 460 575 230 460 575 230 460 575 230 460 575 230 460
575
Wire
Motor
Size
HP
3
3
3
5
5
5
71⁄2 7
1⁄
2 7
1⁄
2
10
10
10
15
15
15
20
20
20 25 25 25 30 30 30 35 35 35
12
110 450
700
90
370 580
10
180 720 1120 140
550 370
90
360 560
50
220 340
8
270 1100 1650 220
900 1400 175
700 1100 105
420 650
320 500
230 360 180 280
6
400 1600 2500 350 1400 2200 220
900 1400 150
600 930 105
420 650
90 370 570 360 560 320 500 230 360
4
370 1500 2300 230
950 1450 175
700 1100 140 550 850 125
500 800 100 400 620 90 360 560
2
370 1500 230 270 1100 1700 220 900 1400 210 820 1250 200 800 1250 150 600 930
*Special Junction Box required for wire sizes larger than #4.
