Installation And Operation - Pentair SHURFLO 5321 Series Installation And Operation Manual

INSTALLATION AND OPERATION

SHURflo offers various pumps models for different
applications. The information outlined by this manual is
general, and not specific to all 5321 series pumps. Be certain
the pumps' materials will be compatible with the fluid being
pumped. 5321 series pumps are intended for intermittent or
continuous duty when the proper operating criteria are met.
Product Data Sheets outlining specific thermal limits, load,
flow curves, and other technical information for a particular
model are available. If unsure of the chemical compatibility
with a given elastomer or the motors intended design, please
call SHURflo for assistance.
PRESSURE SWITCH OPERATION
The pressure switch reacts to outlet pressure, and interrupts
power at the preset shut-off pressure indicated on the pump
label. When outlet pressure drops below a predetermined limit
(typically 15-20 psi.1-1.4 bar less than the shut-off pressure),
the switch will close and the pump will operate until the shut-
off (high) pressure is achieved. The shut-off pressure is set to
factory calibrated standards. See the motor label and Product
Data Sheet for specific pump specifications.
If the plumbing is restrictive or the flow rate is very low,
the pump may re-pressurize the outlet faster than the fluid
is being released causing rapid cycling (ON/OFF WITHIN 2
seconds). If the pump is subjected to rapid cycling during
normal operation, or for infrequent periods, damage may
occur. Applications which exhibit rapid cycling should have
restrictions in the outlet minimized. If not feasible, consider a
SHURflo Accumulator or a SHURflo "bypass" model pump.
BYPASS OPERATION
A bypass pump may be used for applications that normally
induce frequent start/stop of the motor, and thereby create
a potential for overheating. Models equipped with an internal
bypass are designed to pump at high pressure while at low flow
rates. Bypass models equipped with a switch may operate for
several seconds even though the outlet side has been closed
off. Contact SHURflo for information regarding bypass pumps
MOUNTING
The 5321 series pumps are self-priming. Horizontal and
vertical prime vary depending on the fluid viscosity and pump
configuration.
The pump should be located in an area that is dry and provides
adequate ventilation. If mounted within an enclosure,
provisions to cool the motor may be necessary. Heat sinks
which attach to the motor are available from SHURflo if
increased heat dissipation is necessary.
4
The pump may be mounted in any position. However, if
mounting the pump vertically the pump head should be in the
down position so that in the event of a leak, fluid will not enter
the motor. Secure the rubber feet with #8 hardware. DO NOT
compress the feet, doing so will reduce their ability to isolate
vibration/noise.
PLUMBING
Flexible high pressure tubing compatible with the fluid should
be used to connect the inlet/outlet ports. Tubing should be
either 3/8" or ½" [10 or 13 mm] I.D., and at least 18 in. [46 cm]
length is suggested to minimize stress on the fitting/ports and
reduce noise. Allow for the shortest possible tubing route and
avoid sharp bends that may kink over time.
NOTE: Restrictions on the inlet may cause vacuum levels to
reach the fluid vapor pressure, causing cavitation, degassing,
vapor lock and a loss in performance. Inlet pressure must not
exceed 30 psi. [2.1 bar] maximum.
1/2" Male threaded models: Are intended to be used with
SHURflo Swivel Barb Fittings which seal with an internal taper
when hand tightened. Standard 1/2" NPT fittings may be used
when tightened to a maximum torque of 3.7 ft.\Lb. (45 in\Lb.) [5
Nm].
NOTE: SHURflo does not recommend the use of metal
fittings or rigid pipe to plumb the inlet/outlet ports. Standard
plastic male and female threaded fittings can be acquired at
commercial plumbing supply stores. SHURflo also distributes
Swivel Barb Fittings, and special fitting through its dealers.
Sealers and Teflon tape may act as lubricant causing cracked
housings or stripped threads due to over-tightening. Care
should be used when applying sealers. Sealers may enter the
pump inhibiting valve action, causing no prime or no shut-off.
A failure due to foreign debris is not covered under warranty.
Installation of a 50 mesh strainer is recommended to prevent
foreign debris from entering the pump.
If a check valve is installed in the plumbing, it must have a
cracking pressure of no more than 2 psi [.14 bar].
911-398 (11-01-2021)