Pentair SHURFLO PRO BLASTER II 4248 Series User manual

SHURFLO® PRO BLASTER™ II
MARINE WASHDOWN PUMP
MODEL SERIES 4248, 4258, 4348 & 4358
FLOW MANAGEMENT SOLUTIONS 911-1035 REV. F 1
The NEW SHURFLO PRO BLASTER™ II is designed for the toughest washdown applications.
SHURFLO’S PRO BLASTER™ II wash down pump design was created with unique over-molded single piece diaphragm, assuring
long life and top performance in all deck wash down plumbing systems. Designed as the next legendary pump to exceed the
expectations of our customers, the PRO BLASTER™ II pumps are designed for the toughest marine wash down applications.
SHURFLO’S quality reputation has been built on the reliability and dependability of every pump we build. The PRO BLASTER™ II
wash down automatic demand pumps are quiet, thermally protected and can run dry without damage.
INSTALLATION TIPS
❚ Properly sized plumbing
❚ Properly sized wiring
❚ Mount in a dry location that allows
easy access if maintenance is required
❚ Mount higher than the outside water
level, The pump is capable of 6ft. verti-
cal prime above water line.
❚ Use proper fuse size
❚ Install strainer on pump inlet
❚ Minimize plumbing elbows and valves
❚ Flexible high-pressure hose on inlet
and outlet
OPERATION TIPS
❚ Pump is design for intermittent op-
eration only
❚ Turn off power to the pump when boat
is unattended
❚ Maintain your strainer clean for ulti-
mate pump performance
❚ Pump will perform at best when
proper voltage is provided
APPLICATION
❚ Marine 12V DC or 24V DC systems
– see pump label for rated voltage
❚ Wash Down application
❚ General water transfer
FEATURES
❚ 4 independent chambers
❚ Co-Molded diaphragm
❚ Adjustable pressure switch
❚ Self-priming up to 6 feet
❚ Sealed switch
❚ Sealed motor
❚ Corrosion resistance electro-coated
motor
❚ Thermally protected
❚ Ignition protected, CE
Shown with PRO BLASTER™ II 4.0

2
MOUNTING
❚ Consider a DRY location that allows
easy access if maintenance is required.
The pump should not be located in an
area of less than one cubic foot un-
less adequate ventilation is provided.
Excessive heat may trigger the thermal
protector and interrupt operation. When
the temperature drops the thermal
breaker will automatically reset and
start operation.
❚ Mount higher than the water level.
The pump is capable of a 6 ft. [1.82
Meter] vertical prime. The pump can be
mounted in any position. If mounting the
pump vertically, the pump head should
be in the down position.
CAUTION: Do not drive screws through
the vessels’ hull. Use #8 stainless steel
screws to fasten the pump. Choose a
solid surface (bulkhead or stringer)
that will not amplify pump sound. The
mounting feet are intended to isolate
the pump from the mounting surface;
over-tighten, flattening or oversized
screws will reduce the mounting ability
to isolate vibration and noise.
DUTY CYCLE
Wash down pumps are rated for inter-
mittent duty ONLY, as they operate at
higher than average pressures. Operat-
ing a wash down pump continuously for
more than 20 minutes, within an hour
period, is NOT recommended. Actual
duty cycle is determined by amp draw
and temperature. ELECTRICAL
❚ The pump should be on a dedicated
(individual) circuit protected by the
specified fuse on the motor label.
❚ A UL marine duty switch (ignition
protected) rated for 15 amps or higher is
recommended, and must interrupt cur-
rent flow on the positive (+ red) lead.
❚ SHUT OFF POWER TO THE PUMP
WHEN LEAVING THE BOAT UNAT-
TENDED.
PLUMBING
❚ Installation of a strainer (such as
SHURFLO 253 series) is required to pre-
vent debris from entering the pump.
❚ Avoid any sharp radius in the tubing
that may kink over time. Route tubing
away from any heat (exhaust manifolds
etc.) and fasten securely.
❚ Inlet tubing (1/2” [12.7 mm] I.D.
minimum) from the seacock valve to the
pumps should be rated for vacuum. If
rigid pipe is utilized, SHURFLO rec-
ommends that the pump inlet port be
plumbed with 1ft. [3 Meter] of flexible
tubing. Standard garden hose is not
suitable as inlet tubing as it may col-
lapse under vacuum, reducing water
flow.
❚ The pump outlet port should not be
connected to rigid (plastic) pipe. Normal
oscillation of the pump may transmit
through rigid plumbing causing noise
and possibly loosen or cracking compo-
nents. A 1ft. [3 Meter] length of flexible
high-pressure tubing is suggested.
INSTALLATION
The PRO BLASTER™ II series pumps
delivers water on demand. With the
spray nozzle off (output side closed)
the pump will turn off. As the nozzle
is opened, the pressure within the
hose (output side) will drop. Once, the
pressure drops below a predetermined
point, the pumps pressure switch closes
and the pump operates. With the nozzle
set at a fine mist the pump will cycle, as
it is able to pressurize the hose faster
than water being released. If the spray
nozzle is held wide open the pump may
operate continually. The pump may mo-
mentarily operate even after the nozzle
is closed, as it pressurizes the hose.
Once the pressure setting is reached the
switch opens and the pump stops.
Ft. [m] AWG [mm2]
0-20 [0-6] 14 [2.5]
20-50 [6-15] 12 4]
50-70 [15-21] 10 [6]
70-100 [21-30] 8 [8]
Minimum Wire Size for a 10% voltage drop on a 12VDC, 15 Amp
Circuit. Length is the distance from the power source to pump
and back to ground.
NOTES
❚ To prevent cavitation, through hull fittings should be located at least 12 inches [304 mm] off the centerline of the water pick-
up for the motor.
❚ The through hull fitting must have a seacock valve to shut-off in case of an emergency.
❚ Always use high quality non-corrosive fittings, valves and hardware to assure long-term reliability.
❚ Properly seal all pipe threads before the strainer to prevent unforeseen leaks. Never use Teflon tape or sealing compounds on
SHURFLO pump threads or fittings. Sealer may enter the pump causing a failure not covered under warranty.

3
GENERAL SAFETY
PRECAUTIONS
❚ When the vessel is not in use, the
main power switch should be off and
seacock valves should be CLOSED. How-
ever, if left afloat, the bilge pump should
still have power.
❚ Never operate the engine or electri-
cal equipment if fuel vapor is detected.
Locate the source and vent properly.
❚ Electrical connections should be
soldered and insulated to prevent shorts
and corrosion. Wiring should be routed
away from areas prone to water, heat
and excess moisture.
WINTERIZING
Refer to the boat owner’s manual for
specific winterizing instructions. If wa-
ter is allowed to freeze in the system, se-
rious damage to the plumbing and pump
may occur. Failures of this type will void
the warranty. The best guarantee against
damage is to completely drain the pump
and perform the following:
1. Drain the water tank. If the tank
doesn't have a drain valve, open the
spray nozzle allowing the pump to oper-
ate until the tank is empty.
2. Allow the pump to purge the water
from the plumbing, and then turn the
pump “OFF”.
3. Using a pan to catch the remain-
ing water, remove the plumbing at the
pump's inlet/outlet ports. Turn the
pump “ON”, allowing it to operate until
the water is expelled. Turn OFF the
power to the pump once the plumbing
is emptied. Do not reconnect the pump
plumbing. Make a note at tank filler as a
reminder: "Plumbing is disconnected".
STRAINER / FILTRATION
Installation of a 50-mesh minimum
strainer, such as SHURFLO series 253,
is recommended to prevent debris from
entering the pump.
CAUTION: The strainer must be
mounted above the outside water line
to prevent water from siphoning during
cleaning. Mount the strainer where it
can be inspected and cleaned easily
without closing the seacock valve.
MAINTENANCE
Normal pump maintenance is all that
is needed: Checking and cleaning of
the strainer, normal sanitizing and
winterizing and occasionally check-
ing all plumbing hardware and fittings
for tightness. Lack of sanitizing is the
number one reason for premature pump
failure and poor performance over time.
Lack of sanitizing will cause scale build-
up on the diaphragm and valves, causing
low flow and leak back (occasional
pump cycling with spray nozzle closed).
TROUBLESHOOTING
Vibration induced by driving can loosen
plumbing, strainers and pump hard-
ware. Check for system components
that are loose. Also, refer to the chart
below for trouble-shooting tips.
PUMP WILL NOT START/BLOWS
CIRCUIT
√ Electrical connections, fuse or
breaker, main switch, and ground
connection.
√ Is the motor hot? Thermal breaker
may have triggered; it will reset
when cool.
√ Is voltage present at the switch?
Bypass pressure sw. Does the pump
operate?
√ Charging System for correct voltage
(±10%) and good ground.
√ For an open or grounded circuit, or
motor; or improperly sized wire.
√ For seized or locked diaphragm as-
sembly (water frozen?).
WILL NOT PRIME/SPUTTERS
(No discharge/Motor runs)
√ Is the strainer clogged with debris?
√ Is there water in the tank, or has air
collected in the hot water heater?
√ Is the inlet tubing/plumbing suck-
ing in air at plumbing connections
(vacuum leak)?
√ Is inlet/outlet plumbing severely
restricted or kinked? Restrictive
valves?
√ Proper voltage with the pump oper-
ating (±10%).
√ For debris in pump inlet/outlet
valves or swollen/dry valves.
√ Pump housing for cracks or loose
drive assembly screws.
RAPID CYCLING
√ For restrictive plumbing and flow re-
strictions in faucets/shower heads.
√ Water filter/purifier should be on
separate feed line.
√ Shut-off pressure set too low.
PUMP WILL NOT SHUT-OFF / RUNS
WHEN NOZZLE IS CLOSED
√ Output side (pressure) plumbing for
leaks, and inspect for leaky valves
or toilet.
√ For air trapped in outlet side (water
heater) or pump head.
√ For correct voltage to pump (±10%).
√ For loose drive assembly or pump
head screws.
√ Are the valves held open by debris
or is the rubber swollen?
√ Pressure switch operation. By-pass
set higher than shut-off.
NOISY OR ROUGH OPERATION
√ For plumbing which may have
vibrated loose.
√ For a restricted inlet (clogged
strainer, kinked hose, restrictive
valves).
√ Is the pump plumbed with rigid pipe
causing noise to transmit?
√ Does the mounting surface amplify
noise (flexible)? Does it bang like a
drum?
√ For mounting feet that are loose or
are compressed too tight.
√ For air in the system. Check all
fixtures for air and bleed system.
√ The motor with pump head re-
moved. Is noise from motor or
pump head?
LEAKS FROM PUMP HEAD OR SWITCH
√ For loose screws at switch or pump
head.
√ Switch diaphragm ruptured or
pinched.
√ For punctured diaphragm if water is
present in drive assembly.

4
FLOW MANAGEMENT SOLUTIONS
3545 HARBOR GATEWAY SOUTH, SUITE 103, COSTA MESA, CA 92626, [phone] WWW.SHURFLO.COM
All Pentair trademarks and logos are owned by Pentair, Inc. All other brand or product names are trademarks or registered marks of their respective owners.
Because we are continuously improving our products and services, Pentair reserves the right to change specifications without prior notice.
Pentair is an equal opportunity employer.
911-1035 Rev. F 07/14 ©Pentair, Inc. All Rights Reserved.
REPAIR KITS
ITEM 4248-153-X09
PART #
4258-153-X09
PART #
4248-163-X09
PART #
4258-163-X09
PART #
4348-153-X09
PART #
4358-153-X09
PART #
194-804-02* 94-804-02* 94-804-02* 94-804-02* 94-804-02* 94-804-02*
294-800-01 94-800-01 94-800-01 94-800-01 94-800-01 94-800-01
394-801-02 94-801-02 94-801-02 94-801-02 94-801-02 94-801-02
494-71-001-07 94-71-004-17 94-71-001-03 94-71-001-04 94-71-001-07 94-71-004-17
1, 2, 3 94-804-03* 94-804-03* 94-804-03* 94-804-03* 94-804-03* 94-804-03*
Check Valve
(not shown) 94-800-03 94-800-03 94-800-03 94-800-03 94-800-03 94-800-03
Spray Nozzle
(not shown) N/A N/A N/A N/A 94-010-00 94-010-00
Hose
(not shown) N/A N/A N/A N/A 7-071-25 7-137-25
*With preset switch and by-pass adjustment