
7
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 (when
permitted by code) 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.
Installation
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.
• Neverenterpumpchamberaftersewageoreffluent
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.
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.