Sentry STWB140 Manual page 2

1. For your protection always disconnect the
power supply from its power source before
handling the components of your primary
pump.
2. Sump water is non-potable. To reduce the
risk of contamination of the potable water
supply, the backup sump pump must be
installed with a listed backflow device suitable
1. Turbulence caused by high velocity incoming
water can disrupt the on/off action of the
float mechanism. If this condition exists, the
incoming water must be baffled to prevent
excessive turbulence.
2. This pump is designed for handling clear
water. Do not use in septic tanks to pump
effluent or sewage pits to pump sewage.
3. Repair and service of your backup system
should be performed by an authorized
service station.
4. The installation of this backup pump requires
the use of a variable level float switch for
operation. It is the responsibility of the
installer, to ensure that the float switch will
not hang up on the pump or the inside of the
pit. The float must be installed so the pump
will turn "on" and "off". It is recommended
HELPFUL HINTS FOR EASY INSTALLATION
1. The system is designed for installation in
sumps with a minimum diameter of 18-in. and
depth of 22-in. For smaller sump pits, contact
the factory.
2. Remove all debris from the pit before
installation.
3. Be sure that the backup pump is screwed
securely to floor joist or clamped securely to
the primary pump discharge/pipe and that the
two pumps do not interfere with each other.
4. Install a serviceable check valve in the
discharge line.
for the installation, such as a reduced
pressure principle backflow preventer (RP)
in accordance with the local plumbing code.
Alternately, consult the local plumbing
and health codes or the authority having
jurisdiction for guidance on cross-connection
and backflow protection requirements.
that the pit be 18-in. in diameter and 22-
in. deep or larger to accommodate both a
primary and a backup pump.
5. Check the installation of the primary and
backup pump floats to ensure that both
move freely. Adequate space between the
floats must be maintained.
6. The pump should be manually activated
once a month by lifting the float. Let the
pump run for at least 15 seconds to prevent
the pump from building up calcium deposits
and debris, which could harm the pump.
7. The flow control valve may need to be
adjusted to better match the water pressure
of the residence.
5. Install a filter or strainer in the water supply
line before the pump. Size the filter/strainer
properly to minimize pressure drop, while
retaining particles 0.020-in. (0.5 mm) in
diameter and larger.
6. Test the unit immediately after installation.
7. Check the float ON/OFF levels.
8. Keep the model number, date code, and
installation instructions in a convenient
location for future reference.
2
PACKAGE CONTENTS
Item Description Quantity
1 Pump 1
2 Elbow fitting 1
3 Diaphram valve kit 1
Adapter / MPT x slip
4 1
fitting
5 Lag bolts & washers 2 ea
6 Clamps 3
7 Venturi 1
8 Tubing 1
9 Push connect fitting 1
Reducer bushing
10 1
fitting
11 Float kit 1
12 Float, bracket 1
13 Foot valve 1
PERFORMANCE
PUMP PERFORMANCE
CURVE
MODEL STWB140
Feet
14
45
5
10
40
12
15
35 20
10
25
30
30
8
25 35
80 PSI
40
20
6
Shut-off Head:
60 PSI
15
40 PSI
4
Pump capacity will vary due to inlet water pressure, working
10
water pressure, discharge elevation, number of pipe fittings,
2
5
inlet and outlet pipe size, fluid viscosity, degree of water
0 clarity and water temperature. The flow rates in the chart are
5 10 15 20 25
approximate values.
GALLONS
LITERS
0 20 40 60 80
NOTE: Some districts may require a reduced pressure principle
FLUJO POR MINUTO
backflow preventer per ASSE Standards 1013. Check local
IL2350 codes.
6
7
1
4
5
2
13
TOTAL DYNAMIC HEAD/FLOW PER MINUTE
STWB140
Model
40 PSI 60 PSI
Meters Gal Liters Gal Liters
1.5 12.7 48.1 19.0 72.0
3. 12.7 48.1 19.0 72.0
4.6 7.4 28.0 15.0 56.8
6.1 2.0 7.6 11.1 42.0
7.6 - - 7.1 26.9
9.1 - - 3.2 12.1
10.7 - - - -
12.2 - - - -
22.0 ft. (6.7m) 34.0 ft. (10.4m)
3
10
9
3
12
11
8
80 PSI
Gal Liters
20.0 75.7
20.0 75.7
20.0 75.7
20.0 75.7
15.3 57.9
10.9 41.3
6.4 24.2
1.8 .8
42.0 ft. (12.8m)