Troubleshooting Guide; Water Pressure - Sentry STWB140 Manual

CONTROL VALVE ADJUSTMENT
The backup sump pump control valve is preset
from the factory for ideal performance at most
municipal water pressures/installation heights.
Depending on the available water pressure and
height of installation, the control valve may need
to be adjusted to achieve optimal performance.
Refer to the following for this adjustment.
1. Check the backup sump pump run time after
the float valve reaches the OFF position and
water stops flowing through the float valve.
This should be approximately 5 seconds.
This can be checked by raising the float to
actuate the pump and then releasing the
float. The pump should continue to run for
approximately 5 seconds.
2. If this time is significantly longer, the control
valve is overtightened and needs to be
loosened. If this time is significantly shorter,
the control valve is under tightened and needs
to be tightened.
3. Unscrew lock nut so that the thumb screw
may be adjusted.
4. Make adjustment to thumbscrew (In half-
turn increments, clockwise to tighten,
counterclockwise to loosen) and recheck
pump run time after the float reaches the OFF
position.
5. Tighten lock nut to secure thumbscrew
position.
Thumb
Screw
Locknut
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TROUBLESHOOTING GUIDE

1. Pump will not start – Control valve is under
tightened. Refer to control valve adjustment
for adjustment instructions.
2. Pump will not shut off – Control valve is over
tightened. Refer to control valve adjustment
for adjustment instructions.

WATER PRESSURE:

40 PSI minimum with valve open.
80 PSI maximum with valve open.
100 PSI maximum with valve closed.
CONDITION POSSIBLE CAUSE
Inadequate incoming
water pressure
Excessive incoming
water pressure
PUMP WILL NOT
A Debris around Intake
START OR RUN
Float hung up on pit or
primary pump
Control valve is under-
tightened
PUMP STARTS Float valve is positioned
B
TOO SOON too low
Float is obstructed
Internal valve diaphragm
vent hole is plugged with
PUMP WILL NOT
C debris
SHUT OFF
Control valve is over-
tightened
Debris around intake
Inadequate incoming
water pressure
PUMP OPERATES
Blockage in discharge
BUT DELIVERS
D pipe
LITTLE OR NO
Foot valve above water
WATER
level
Vertical lift too high
EFFICIENCY:
The pumping capacity increases with household
water pressure and flow.
At an eight-foot static head and a supply pressure
of 40 PSI at water supply inlet with water flowing,
it takes one (1) gallon of supply water to remove
one and a half gallons from the sump. As the
supply pressure increases with the static head
constant, less supply water is required.
REMEDY
Check incoming water line for closed valve, low
water pressure or clogged filter/strainer.
Install regulator and reduce pressure below
100 PSI with valve closed.
Clear debris from pit and foot valve strainer.
Move pumps so that the floats move freely and
do not contact pit, piping or each other.
Refer to section on control valve adjustment.
Refer to section on float valve installation.
Inspect float operation and correct problem.
Turn off water supply to pump and back on
repeatedly to dislodge debris. If this process
does not remedy the problem, service pump to
clear debris or replace valve assembly.
Refer to section on control valve adjustment.
Clear debris from pit and foot valve strainer.
Check incoming water line for closed valve or
low water pressure.
Remove pipe and flush out debris.
Adjust Float - Refer to section on float valve
installation.
Change discharge piping or contact technical
service.
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