Installation - Pentair MYERS MWH50 Série Manuel D'installation Et D'utilisation

INSTALLATION

MOTOR TYPE
Motors are ¾ frame, 1/2 – 2HP single or three phase, 60 Hertz,
3450 R.P.M. with class B insulation. All single phase motors are
permanent split-capacitor (PSC) type with built-in on-winding
overload protection and do not require a start switch or start
relay. The three phase pump motors require a magnetic starter
with 3 leg overload protection. All motors have upper and lower
ball bearings and all are oil-cooled and lubricated.
Breathing hazard. Basin or tank must be vented in
accordance with local plumbing codes. These pumps are not
designed for and CANNOT be installed in locations classified as
hazardous in accordance with the National Electric Code ANSI/
NFPA 70.
Never enter pump chamber after sewage or effluent

has been in basin. Sewage water can give off methane,
hydrogen sulfide and other gases which are highly
poisonous.
Myers recommends installing ME series effluent pumps with
a quick removal system. The quick removal system may be a
union or quick-release coupling if the pipe or discharge hose
is within reach from the surface, or a rail system type quick
disconnect on deeper installations. See installation drawings for
suggested installation.
The dosing tank or pumping chamber must be constructed
of corrosion resistant materials and must be capable of
withstanding all anticipated internal and external loads. It also
must not allow infiltration or exfiltration. The tank must have
provisions for anti-buoyancy. Access holes or covers must be
of adequate size and be accessible from the surface to allow
for installation and maintenance of the system. Access covers
must be lockable or heavy enough to prevent easy access
by unauthorized personnel. The pumping chamber holding
capacity should be selected to allow for emergency conditions.
23822A278 (02-13-20)
The discharge pipe must be the same size as the pump
discharge (2 inches) or larger. In order to insure sufficient fluid
velocity to prevent any residual solids from collecting in the
discharge pipe, it is recommended that a minimum flow of 2 feet
per second be maintained. (21 GPM through 2" pipe and 46 GPM
through 3" pipe). It is recommended that PVC or equal pipe is
used for corrosion resistance.
A full flow (ball or gate) shut off valve must be installed to
prevent back flow of effluent if the pump must be removed for
service. A check valve must be installed on pressure sewer
systems and on other systems where conditions allow to
prevent backflow and to reduce wear on the pump system.
A high water alarm must be installed on a separate circuit from
the pump circuit. The alarm should have the ability to be tested
for proper operation.
S PECIAL INSTRUCTIONS FOR THREE PHASE PUMPS
1. Myers recommends three phase pumps to be installed by
qualified personnel.
2. Risk of electric shock. Do not remove cord and
strain relief. Do not connect conduit to pump.
3. Three phase pumps are always installed with control boxes
having magnetic starters with 3 leg overload protection. DO
NOT TRY TO RUN THREE PHASE PUMPS DIRECTLY ACROSS
THE LINE.
4. To Connect Pump: Run wire from pump to the bottom
of control box or appropriate junction box suitable for
enclosing splice connections. A hole must be cut into the
control box for the wires. With power to control box off,
connect green (ground) line to ground lug. Connect black
(power) wires to power lead terminals.Note: for a typical CE
style control box, these terminals are marked M1, M2 and
M3. Make sure that all wires are inside control box and not in
a position to be pinched or shorted when the door is closed.
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