Table of Contents
Advertisement
Adjustment in the Hydr-O-
Matic Grinder Pump Service
Manual.
2. Recheck electrical wiring. See
diagrams inside control panel.
3. Check for proper rotation of
3 phase pumps by turning
H-O-A switch to Hand then
off. The impeller should
turn counterclockwise when
viewed from the suction. If
rotation is wrong, turn off
main breaker and interchange
any two line leads to motor
to reverse. If pump is piped
in permanently, rotation can
be checked as described in
Starting the System.
4. IMPORTANT: Any air trapped
in the pump must be released
before pump can operate
properly. To vent trapped air
in 1-1/2 and 2 horsepower
pumps, remove the machine
screw in the volute. Vent 3 and
5 horsepower pumps as in Step
5 of Starting the System.
5. If pump has been out of service
for a period of time, rust may
build up and bind the impeller
to the volute. With power off,
turn impeller by hand before
restarting after extended shut
down.
Starting the System
1. Run water into basin until
motor is covered.
2. Open gate valve in discharge
line.
3. Turn selector to Off position
and turn on main breaker.
4. Recheck all legs of panel
primary voltage to motor
nameplate voltage.
5. Vent the rail mounted 3 and
5 horsepower pumps by first
closing the discharge gate valve
and then lifting the pump by
the chain until sealing flange
is broken. Turn selector switch
to Hand briefly to vent off
any trapped air. If pump is
piped in permanently, it will be
necessary to disconnect union
at pump discharge to clear air.
6. Start pump.
7. Check amperage. Readings
higher than nameplate indicate
clogged pump, miswiring, or
voltage that is higher or lower
than normal. If basin is not
pumped down and amperage
readings
are
considerably
lower than nameplate, then
pump is still air locked. Note
that nameplate amperage is
rated at the largest diameter
impeller, and that pumps with
cut diameter impellers will
draw slightly less amps than
nameplate.
8. Refill basin and set H-O-A
switch to Auto position. For
Simplex System, pump should
start when level is just above
pump and should pump down
within 2 inches of pump
suction inlet to shut off.
Adjust floats as necessary to
accomplish this. In some
systems, a time delay switch
may be installed in the control
panel to override the shut-off
switch. This allows the pump
to continue operating below
the normal stop setting and
break suction to clear all solids
through the cutters during the
run cycle. The cutters are then
free for normal starting on the
next cycle. This 0–3 minute
adjustable time delay should be
set so that the pump will break
suction and continue to run for
10–20 seconds.
If system is Duplex, float
controls should be set so that
pump turns off when level is
about 2 inches above inlet and
turns on when level is about
2 inches above water. The
override level should be set
about 3 inches above turn-on
level.
For Duplex System, one pump
should start when level reaches
first upper control and will
continue to operate until level
of lower control is reached.
On next cycle, pump should
alternate when first upper
control level is reached.
To check override level, set
both H-O-A switches to Off
and fill basin above upper
override control. Turn both
H-O-A switches to Auto
position and both pumps should
start. Turn off one pump and
be sure second pump starts
when override level is reached
on second trial.
If pumps fail to cycle in this
manner, recheck voltage and
retrace control float wiring to
terminal block.
9. Set selector switches to Auto
position and install sump cover.
10. Be sure ground wire is
connected to a good ground.
this is important for safety.
Pump
Troubleshooting
Below is a list of common
problems
and
solutions. Refer to Grinder Pump
Installation and Service Manual
for any necessary adjusting,
dismantling
or
repair
required on the pump.
Pump runs but does not pump
down the basin with the selector
switch on either Hand or
Automatic position
1. Pump may be air locked.
Remove the pump (1-1/2 and
2 horsepower) from the basin
and clean the tapped hole in the
volute if clogged with grease
or debris. If pump is 3 or 5
horsepower, vent off air as in
Step 5 of Starting the System.
possible
work
7
Advertisement
Table of Contents
