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GENERAL DESCRIPTION AND
APPLICATION
Myers ME and MW series pumps are available in both
a single seal design and double seal design with leak
detector. The ME33-150 models are designed for Effluent
dosing, Septic Tank Effluent Pumping (S.T.E.P.) or normal
sump and general dewatering applications where higher
pressure is required. These units are designed to handle
¾" spherical solids. The MWH50-MW200 models are
designed for raw sewage applications and can pass 2"
spherical solids. These units can also be used for sump
and general dewatering applications where larger solids
capabilities are required.
When used in Effluent dosing or S.T.E.P. applications,
the pump must be installed in a separate tank or
compartment at the discharger side of the septic
tank. NEVER INSTALL PUMP IN MAIN TANK WHERE
SLUDGE COLLECTS.
These pumps are available in single phase and three
phase, and either in single seal or double seal with seal
leak detector. All three phase units, all double seal units
and all duplex installations must be used with a control
box. All power cords and seal leak detector cords are 20
feet long.
The ME model impellers are enclosed two vane type
to handle ¾" spherical solids and are available made of
engineered thermoplastic or cast brass. All pumps have
a 2" NPT discharge tapping.
The MW model impellers are enclosed two vane
non-clog style, designed to handle 2" spherical solids.
The MW pumps are available with standard cast iron or
optional cast brass impellers.
These pumps are NOT for use in swimming pools or
fountains.
AIR LOCKING
A sump pump is said to be air locked if water traps air
in the pump and it cannot get out, thus preventing the
pump from operating.
In installation of this type a 1/8" hole should be drilled in
the discharge pipe below the check valve. The check valve
should be 12 to 18 inches above pump discharge. Do not
put check valve directly into pump discharge opening.
PACKAGING
Each pump is packaged separately in a carton marked
with a catalog number and Myers engineering number.
LEVEL CONTROLS
All pumps must use sealed level control switches for
automatic operation. MLC and MFLC controls have
sealed switches that are 1 HP rated at 230 volts. ALC
and AWS-1 controls have sealed mechanical switches
that are rated 2 HP at 230 volts.
23833A278
Simplex single phase pumps can be made automatic
by attaching MFLC or MLC controls to the pump. These
switches have a fixed draw off level of 8 to 10 inches
and can be used up to 1 HP. For higher horsepower
ratings two mercury switches (or SMNO) controls with
a magnetic starter can be used. Simplex systems may
also use on/off pilot mercury control switches with
control box and magnetic starter. The ALC and AWS-1
controls can be used for simplex single phase pumps
with ratings up to 2 HP. All duplex systems must use
pilot mercury control switches with control box and
magnetic starters. Plug-in cords can be used on all the
single phase pumps with a single seal (does not have
a seal leak detector). This cord has a GROUND pin
that plugs into a grounded receptacle. The grounded
receptacle cannot be used in the wet sump or basin due
to DANGER of current leakage. Sealed junction boxes
must be used in wet sumps or basins to make connections
to motor cord. The AWS-1 control also acts as a sealed
junction box for connecting power cord to pump cord.
DOUBLE SEAL PUMPS
All pumps in this series "ME—D" or "MW—D" have
two seals with an oil chamber between the seals so that
the seal faces of both the lower and upper seals are oil
lubricated for longer life and greater protection against
water leaking into the motor windings. These double
seal units are all made with a seal leak detector.
The leak detector in the oil seal chamber detects any
water leakage into the chamber and turns on a red signal
light in the control panel. Pumps should be removed from
the sump and seals replaced after the seal light shows in
the panel. Control panels must be used for pumps having
the seal leak detectors, and seal leak detectors must be
wired as illustrated in these instructions.
DESIGN OF PRESSURE SEWER SYSTEMS
MYERS has available complete computer SOFTWARE
for designing PRESSURE SEWER SYSTEMS. This gives
pipe sizes to use and gives exact flow from any pump
or group of pumps in the system when operating
simultaneously. This design DISK for IBM or COMPATIBLE
computers is available to engineers on request.
MOTOR TYPE
Motors are ¾ frame, 1/3 – 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.
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