5
NOTE: Each cable has a green
ground wire and must be
properly grounded per the
National Electric Code and
local codes.
Electrical Motor Controls:
All electrical controls and motor
starting equipment should be as
specified in these instructions.
Consult factory for any acceptable
alternatives. For hazardous
locations the controls and control
panel must be installed outside the
hazardous area, or approved
explosion-proof controls that are
intrinsically safe must be used.
Junction Box:
If a junction box is used in a
hazardous location, it must be an
explosion-proof approved type
with explosion-proof cord
connectors. Wires from the
junction box must pass through an
explosion-proof seal connector.
Level Sensing Controls:
Intrinsically safe-type float
controls are recommended for all
applications and required for
explosion-proof service. An
intrinsically safe control panel
relay will limit the current and
voltage to the level controls.
A Hydromatic control panel
can be supplied with this type
circuitry.
The float level controls
maintain the basin sewage water
level by controlling pump turn-on
and turn-off levels.
1. The lower turn-off control
should be set so that the pump
stops with the water covering
the entire motor housing.
Consult the factory for any
settings below this point.
2. The upper turn-on control
should be set above the lower
turn-off control. The exact
height between the two
controls is determined by the
number of pump starts desired
and the depth of the basin.
A maximum of 10 starts per
hour should not be exceeded.
3. The override control is set at a
specified height above the
upper turn-on control.
4. The alarm control is set about
6" to 12" above the
override control.
5. No control should be set above
the inlet invert.
Electrical Connections:
All electrical wiring must be in
accordance with local code and
only qualified electrician should
make the installations. Complete
wiring diagrams are included for
use in making the installation. All
wires should be checked for
shorts to ground with an
ohmmeter or Megger after the
connections are made. This is
important, as one grounded wire
can cause failure of the pump,
control panel or personal injury.
Pump:
The fluid end of the pump is field
serviceable and can be
disassembled in case of wear,
damage, plugging or outboard
seal failure. The following will
describe the disassembly and
reassembly process.
WARNING: Disconnect the
power first.
Disassembly:
1. With the pump located in a
secure place, remove the bolts
fastening the seal housing to
the volute. The motor and
impeller can now be removed
as a unit.
2. Lay the unit down on its side.
If the lower seal is to be
removed, it is recommended
that the oil in the seal chamber
be drained. This can be done
by removing the lower seal
chamber plug and draining the
oil into a holding container.
3. Using a proper wrench, the
impeller retaining nut must be
removed. This may require a
piece of wood placed between
the vanes to keep the impeller
from rotating while removing
the nut. Loctite™ is used
on this bolt and heating to
450°F to 500°F may also be
required to loosen. The
impeller is mounted on a
threaded shaft. To remove
impeller, rotate impeller with
one hand while holding pump
shaft with screwdriver.
4. If the lower seal needs to be
removed, first remove the
compression spring that rides
between the impeller and the
seal assembly. Next take a
pair of screwdrivers and
remove the compression ring
that surrounds the rubber
bellows on the rotating portion
of the seal assembly. Again
using the screwdrivers, pry
the remaining portion of the
rotating seal assembly off the
shaft. The ceramic stationary
assembly can be removed by
placing a screwdriver between
the rubber and the ceramic
face, and then prying, working