Pentair SHURFLO BLASTER 4238 Series User manual

SHURFLO® BLASTER™ II 3.5 GPM
MARINE WASH DOWN PUMP
MODEL SERIES 4238 & 4338
911-1047 REV. B 1
SHURFLO BLASTER™ II Designed for the toughest wash down applications.
SHURFLO’s 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 expec-
tations of our customers, the 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 BLASTER™ II wash down auto-
matic 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. vertical
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 applications
❚ 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

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.
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.
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.
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.
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.
SHURFLO’s 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 sys-
tems. Designed as the next legendary
pump to exceed the expectations of our
customers, the BLASTER™ II pumps are
designed for the toughest marine wash
down applications. SHURFLO’s quality
reputation has been built on the reli-
ability and dependability of every pump
we build. The BLASTER™ II wash down
automatic demand pumps are quiet,
thermally protected and can run dry
without damage.
to pump inlet port
outside water lavel
6 ft. max [1.82 m]
Verical lift from
strainer
hull fitting
Through
Inlet Outlet
SHURFLO
Ignition protected
See pump label for fuse size
U/L marine switch
spray nozzle
Black
PumpSHURFLO
Red
Battery
SHURFLO
Sea-cock
valve
from thru-hull fitting, strainer,
Use flexible high pressure tubing
and pump. Tubing should be rated
for below water line use.

3
PLUMBING
❚ Installation of a strainer (such as
SHURFLO 253 or 255 Series) is required
to prevent 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.
GENERAL SAFETY PRECAUTION
❚ 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
water is allowed to freeze in the system,
serious damage to the plumbing and
pump may occur. Failures of this type
will void the warranty. The best guar-
antee against damage is to completely
drain the pump and perform the follow-
ing:
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 253 or 255
Series, 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).

4
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.
911-1047 Rev. B 08/15 ©Pentair, Inc. All Rights Reserved.
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
restrictions 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.
SERVICE KITS
ITEM 4238-121-X07
PART #
4238-141-X07
PART #
4338-121-X07
PART #
194-800-13 94-800-13 94-800-13
294-800-01 94-800-01 94-800-01
394-800-15 94-800-15 94-800-15
494-71-002-07 94-71-001-17 94-71-002-07
1, 2, 3 94-800-17 94-800-17 94-800-17
Check Valve
(not shown) 94-800-03 94-800-03 94-800-03
BLASTER™ Nozzle
(not shown) — — 94-010-11
25' Coiled Hose
(not shown) — — 7-071-25
*With preset switch adjustment
2
3
4
1