4
Pump
Servicing
Read the following instructions
carefully before replacing any
parts. Reasonable care and safe
methods should be practiced.
Check local codes and
requirements before installation.
Only competent electrician
should make the installations.
Tools Required:
General shop tools including
socket wrenches and a bearing
puller. An ohmmeter is required to
thoroughly check motor and wiring.
For proper automatic operation,
make sure the pump power cord is
plugged into the piggyback
receptacle on the float switch cord.
Before removing the pump from
its installation for repairs, check
first to see if the trouble is
caused by:
1. Miswiring of the pump into
the terminal block (control
panel) - 3ø and 1ø manual pumps.
2. Miswiring of the float level
controls into the panel.
3. Miswiring inside the control panel.
4. Tripped circuit breaker. If the
breaker is manually reset
and then trips off again, the
problem could be:
a. short circuit in motor or
control panel
b. water in the motor housing
c. insufficient amp capacity of
wiring or breakers
d. improper panel wiring
e. low voltage supply
5. If automatic pump is used,
unplug pump and switch in
piggyback connection. Plug
pump power cord in properly
grounded receptacle. If pump
runs, replace switch. If pump
does not run, disconnect
power source and continue
with check.
6. Tripped overload. If overload
is manually reset and then
trips off again, the problem
could be:
a. pump or piping clogged
b. pump motor or bearings
may be defective
c. start capacitor in motor may
have failed
d. pump may be miswired to
terminal block
e. head lower than rating,
pumping too much liquid
7. Air locked pump. Disconnect
piping at union and run until
all air bubbles are expelled.
8. Check for air lock. A sump
pump is said to be air locked if
water traps in the pump and it
cannot get out, thus preventing
pump from operating.
Hydromatic pumps have a
small air vent hole in the
impeller cavity to let out
trapped air. If this hole
becomes plugged, pump may
air lock. To break the air
lock, use a small screwdriver
to clear hole in the
impeller cavity.
As a secondary precaution in
installations of this type —
1
⁄
16" hole should be drilled in
the discharge pipe below the
check valve. The check valve
should be 12 to 18 inches
above pump discharge. Do not
put check valve directly into
pump discharge opening.
NOTE: In sumps where the
pump is operating daily, air
locking rarely occurs.
9. Wrong impeller rotation
(3ø only). Rotation should be
counterclockwise when looking
at the impeller. Correct
improper rotation on three
phase pumps by reversing any
two line leads. No rotation
check is necessary on single
phase pumps.
10.Closed discharge gate valve.
11. Plugged impeller or pipeline.
12.Discharge head may be too
high. Check elevation against
design point of pump (65'
SHEF50, 90' SHEF100).
13.Floats not hanging free in
the sump.
14.Malfunctioning floats.
Disconnect power supply.
Checking Power Cord:
To be sure wires are not burned
off or broken in cord, use ohmmeter
for check. Set ohmmeter scale
pointer to R x 1 scale and attach
one meter lead to white cord wire
and one meter lead to black cord
wire, then place a screwdriver
blade across terminals of plug. If
cord is OK, meter needle will go
to zero and stay there. If meter
needle does not move, this will
indicate an open wire and cord
must be replaced.
Motor:
Warning: Be certain power to
pump is off! Disconnect pump
power cord from terminals in
control panel (manual pump
models) and power source
(automatic models) and remove
pump from sump.
1. Clean any dirt or trash from
the outside of the pump
before dismantling.
If the unit is being operated by
float switch, unplug the pump
from the piggyback receptacle
and plug the pump directly
into the power source. If the
Содержание SHEF100
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