Shurflo 4901-4292 Installation Manual

INSTALLATION AND OPERATION MANUAL

The Pro Blaster wash down pump 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) drops. 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 momentarily 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.

ELECTRICAL

+

CAUTION:

Use of "open" type switches
(not ignition protected) may cause
an explosion of fuel vapors.

• The pump should be on a
dedicated (individual) circuit
protected by the specified
fuse indicated on the motor
label.

• A U/L approved marine duty

(ignition protected) switch rated
at or above 15 amps is recom­mended, and must interrupt
current flow on the positive (+
red) lead.

• Wire size (gauge/Mm2) is based
on the distance from the power
source to the pump. The
minimum recommended wire
size is #14 gauge [2.5Mm2]. For
lengths of 20-50 ft. [6-15M] use
#12 gauge [4Mm2]. The pump
must be grounded to a "known
ground" (battery). The ground
wire must be the same size as
the positive wire.

911-741 Rev F 12/08 ECO #: 16135 Page 1 of 4

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 unless adequate ventilation is provided.
Excessive heat may trigger the integral thermal breaker and interrupt operation. When the
temperature drops the breaker will automatically reset and start operation.

• Mount higher than the outside water (sea) level. The pump is capable of a 6 ft. [2M] vertical
prime above the outside water level. 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 vessel's hull. Use #8 stainless steel hardware 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-tightening,
flattening, or oversized screws will reduce the mounting pads ability to isolate vibration and noise.

Plumbing

· SHURflo recommends at least 1ft. [.3M] of ½"[13mm] I.D. flexible high pressure tubing to both ports. Ideally

the pump's ports/strainer should not be connected to plastic or rigid pipe. The pump's normal
oscillation may transmit through rigid plumbing causing noise, and possibly loosen or crack
components.

· Installation of a 50 mesh strainer such as SHURflo 253 series is recommended to prevent foreign debris from
entering the pump.

SHURflo hex/swivel barb fittings provide easy removal if maintenance or access is required. The

fittings are designed with a "taper-seal", creating a water tight connection when hand-tightened.
Always secure barb tubing connections with properly sized stainless steel clamps to prevent leaks. Never use
Teflon tape or sealing compounds on threads. Sealer may enter the pump causing a failure. Failure due to
foreign debris is not covered under warranty.

· Rapid cycling may be caused by excessive back pressure created by one or more of the following within a
plumbing system:

Water filters and purifiers not on separate feed lines, Flow restrictors in faucets and shower heads, Small ID lines

Pipe/tubing should be at least 1/2” [13mm] for main lines, Restrictive fittings and connections (elbows, “T”’s, feeder
lines to faucets, etc).

NOTES:

• To prevent cavitation, through hull fittings should be located at least 12 in. 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.

STRAINER / FILTRATION

Installation of a 50-mesh minimum strainer, such as SHURflo series 253, is recommended to prevent
debris from entering the pump. SHURflo recommends at least 1ft. (.3 M) of 1/2” or 3/4” (13mm) I.D.
flexible high-pressure tubing on both ports. Ideally, the pump ports and strainers should not be
connected to plastic or rigid pipe. The pump’s normal oscillation may transmit through rigid plumbing
causing noise, and possible loosen or cracking components.

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 an cleaned easily without closing the
seacock valve.

911-741 Rev F Page 2 of 4