Pentair SHURFLO AQUA KING II 4148 Series User manual

SHURFLO® AQUA KING™ II FRESH WATER PUMPS
PREMIUM 4.0 GPM AND SUPREME 5.0 GPM
MODEL SERIES 4148 & 4158
911-1026 REV. F 1
The NEW SHURFLO AQUA KING™ II delivers smooth and high-powered fl ow.
SHURFLO’s New 4148 and 4158 series fresh water pump design was created with unique over-molded single-piece diaphragm
and internal by-pass, assuring long life and top performance in all plumbing systems. Designed as the next legendary pump to
exceed the expectations of our customers, the 4148 and 4158 series pumps are constructed for high fl ow demand, smooth fl ow
and no rapid cycling. Our quality reputation has been built on the reliability and dependability of every pump we build. The 4148
and 4158 series fresh water automatic demand pumps are quiet, thermally protected and can run dry without damage.
INSTALLATION TIPS
❚ Properly sized plumbing
❚ Mount on a solid surface within 6 feet
of tank
❚ Properly sized wiring
❚ Use proper fuse size
❚ Install strainer on pump inlet
❚ Dry and accessible location
❚ Minimize plumbing elbows and valves
❚ Flexible high-pressure hose on inlet
and outlet
OPERATION TIPS
❚ Do not adjust switch or bypass set-
tings without contacting customer
service
❚ Pump is designed for intermittent
operation only
❚ Turn off power to the pump when boat
is unattended
❚ Keep your strainer clean for ultimate
pump performance
❚ Do not use pump for Reverse Osmosis
fi ltration system
APPLICATION
❚ Marine 12V DC or 24V DC fresh water
systems—see pump label for rated
voltage
❚ Multi-Fixture, up to 4 fi xtures
❚ General fresh water transfer
❚ Pressurized water systems in cabins
FEATURES
❚ 4 independent chambers
❚ Co-Molded diaphragm
❚ Adjustable switch and by-pass
❚ Self-priming up to 6 feet
❚ Dry run capability
❚ Sealed switch
❚ Sealed motor
❚ Corrosion resistant electro coated
motor
❚ Thermally protected
❚ Ignition protected, CE

2
MOUNTING
❚ Mount the pump within 6 feet (Max) of
the tank for best performance and pump
life. The pump will pull farther, but the
farther it pulls the more work it does,
increasing vibration and noise, and
reducing the output and pump life.
❚ Mount pump in a space of at least 1
cubic foot for adequate ventilation to
prevent overheating.
❚ Pump may be mounted in any posi-
tion.
❚ Mount pump for easy access for
cleaning strainer, maintenance and
service.
❚ Mount pump on a solid surface to
prevent vibration and noise.
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 is required to
prevent debris from entering the pump.
For noise and vibration reduction we
recommend at least 18 in. [.5 M] of
1/2" [13mm] I.D. flexible high-pressure
hose to both ports. The pump ports and
strainer should not be connected to
plastic or rigid pipe. This hose should
be anchored where it meets the hard
plumbing to reduce plumbing vibration.
INSTALLATION
The goal of installation is to provide a
quiet, easy to maintain installation with
good flow and low back pressure. This
can be accomplished with the following
guidelines:
❚ Mount on a solid surface in an acces-
sible location for strainer cleaning and
pump maintenance.
❚ Use flexible high-pressure hose on
the pump inlet and outlet [such as
SHURFLO Kit 94-591- 01]. The pump
ports and strainer should not be con-
nected to plastic or rigid pipe, or the
pump's normal motion will transmit
through rigid plumbing causing noise,
and possibly loosening or cracking
components.
❚ Pump must use an adequate 50-mesh
strainer [such as SHURFLO 255 series
strainers].
❚ Use a minimum of 1/2" [13mm] Inner
Diameter plumbing. Smaller ID plumb-
ing will cause cavitation, high back
pressure, low flow and noise.
❚ Pump is designed for intermittent duty
only: Do not use these pumps for run-
ning a Reverse-Osmosis [RO] Filtration
System. High pressure continuous duty
usage will shorten the life of the pump
and is not covered under warranty.
❚ Wire Size is 14 GA [2.5mm²] MINI-
MUM, 12GA [4mm²] is recommended—
See Wire Chart in Electrical Section for
minimum sizing.
❚ Minimum power requirement is a 15
Amp circuit.
❚ Reduce restrictions on inlet and out-
let. This includes small inner diameter
shut-off valves, winterizing valves and
elbows.
INSTALLATION GUIDELINES
❚ Solid surface within 6 feet of tank
❚ Accessible location
❚ Minimize flow restrictions in the
system
❚ Strainer on pump inlet
❚ Properly sized wiring
❚ Flexible hose on inlet and outlet -
Proper electrical protection
❚ Minimize plumbing elbows and valves
❚ Properly sized plumbing
Typical Pump Installation
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.

3
OPERATION
This pump is designed for intermittent
duty only. The pump operates normally
up to about 30 PSI [2.06 Bar], where a
spring-loaded by-pass valve opens, al-
lowing flow back from the output side to
the input side, providing smooth, steady
flow with minimal cycling. As a faucet is
opened back up, the pressure will drop,
the by-pass will close and full flow is
again obtained. This allows good flow,
even with today’s restrictive showers
and pullout sprayer faucets. Perfor-
mance will vary, of course, depend-
ing on the voltage to the pump; lower
voltage = lower flow, higher voltage =
higher flow. Remember your electrical
safety: It is always best to shut power to
the pump “OFF” when leaving the Boat
unattended.
SANITIZING
Potable water systems require periodic
maintenance to keep components work-
ing properly and deliver a consistent
flow of freshwater. Sanitizing is recom-
mended: prior to storing, after a period
of storage, or any time the system is
opened or contaminated, as follows:
NOTE: Check your Boat Owner’s Manual
for specific instructions. By-pass any
filters or remove filter cartridges.
1. Determine the amount of common
household bleach needed to sanitize the
tank.
A) 2 ounces of bleach per 15 gallons
tank size: 60 gallon tank [15 x 4] = 4 x
2 ounces = 8 ounces of bleach.
B) 1 ml bleach per 1 liter tank size:
300 liter tank = 300 milliliters of
bleach.
2. Mix the bleach with water in a con-
tainer such as a gallon jug. If tank is
filled through a pressurized fitting, pour
the bleach into the hose before attach-
ing the hose to the city water entry.
3. Pour the bleach solution into the tank
and fill the tank with potable water. Rock
the boat back and forth to coat top and
sides of potable water tank.
WINTERIZING
Refer to the boat owner’s manual for
specific winterizing instructions. If water
is allowed to freeze in the system, seri-
ous 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 all fau-
cets allowing the pump to operate until
the tank is empty.
2. Open all the faucets (including the low-
est valve or drain in the plumbing), allow
the pump to purge the water from the
plumbing, and then turn the pump “OFF”.
ABOUT THE BY-PASS
NOTE: By-pass adjustment should only
be performed by a qualify technician
with proper gauges and equipment.
The bypass is a spring loaded dia-
phragm that opens up allowing water
from the discharge side back to the inlet
side. The by-pass is set to begin opening
at about 30 psi [2.06 Bar] and creating
full by-pass at about 65 psi [4.48 Bar].
The pressure switch on the pump is set
to shut off at 55 psi. If the switch or by-
pass are adjusted too much, the by-pass
and switch shut-off can overlap and THE
PUMP WILL NOT SHUT OFF. Screw-
ing the switch screw in clockwise will
raise the shut-off pressure. Unscrew-
ing the switch screw counterclockwise
will lower the pump shut-off pressure.
Screwing the by-pass screw in will
raise the pressure at which the by-pass
starts and raise the maximum by-pass
pressure. Unscrewing the by-pass screw
counterclockwise will lower the pres-
sure at which by-pass starts and lower
the by-pass pressure. WARNING: If full
by-pass is reached before the shut-off
setting, the pump will not shut off. Maxi-
mum by-pass pressure setting should
be at least 10 psi [0.68 Bar] higher than
pump shut off pressure.
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”
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".
4. All faucets must be left open to guard
against any damage.
5. Potable anti-freeze may be poured
down drains and toilets to protect
p-traps and toilet seals. Sanitize the
plumbing system before putting the
plumbing system back in service.
4. Open all faucets (Hot & Cold) allow-
ing the water to run until the odor of
chlorine is detected. Allow four (4) hours
of contact time to disinfect completely.
Doubling the solution concentration al-
lows for a contact time of one (1) hour.
5. Drain the tank. Refill the tank and
flush the system once or twice until the
odor has decreased. The residual chlo-
rine odor and taste is not harmful.
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 no faucets open or
tank filling up when hooked up to city
water].

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3545 HARBOR GATEWAY SOUTH, SUITE 103, COSTA MESA, CA 92626, [phone] WWW.SHURFLO.COM
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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.
911-1026 Rev. F 07/15 ©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 4148-153-X75
PART #
4148-163-X75
PART #
4158-153-X75
PART #
4158-163-X75
PART #
194-801-10* 94-801-10* 94-801-10* 94-801-10*
294-800-01 94-800-01 94-800-01 94-800-01
394-801-02 94-801-02 94-801-12 94-801-12
494-71-001-07 94-71-001-03 94-71-000-17 94-71-001-04
1, 2, 3 94-801-11* 94-801-11* 94-801-13* 94-801-13*
Check Valve
(not shown) 94-800-03 94-800-03 94-800-03 94-800-03
*With preset switch and by-pass adjustment
2
3
4
1