3
The float level controls maintain the basin sewage
water level by controlling pump turn-on and turn-
off level.
1. The lower turn-off control should be set so that the
pump stops at approximately the top of the pump.
2. The upper turn-on control should be set above the
lower turn-off control. The exact height between
the two controls is determined by the number of
pump starts desired and the depth of the basin.
A maximum of 10 starts per hour should not
be exceeded.
3. The override control is set at a specified height
above the upper turn-on control.
4. The alarm control is set about 6" to 12" above the
override control.
5. No control should be set above the inlet invert.
Air Venting: Air tends to trap in the pump volute when
water rises in the sump or when the pump is lowered
into water after service. To vent off this air, a small
hole is drilled into the pump volute. Be sure this vent
hole is clean after any service work on pump.
Usage: The WGL20 grinder pumps are for pumping
domestic sewage. These pumps are not to be used
for pumping commercial or industrial sewage such as
from motels, schools, apartments, factories, etc.
Pump Models: The WGL20 pumps are equipped
with 208 and 230 volt single phase voltages and 208,
230, 460 and 575 volt three-phase voltages; and
with or without seal leak detector. WGL20F pumps
are high flow pumps and WGL20H pumps are high
head pumps.
Caution: Pump is only to be disassembled at Myers
factory or an authorized Myers service facility.
Description of Pump: This pump is intended to grind
and pump all normal sewage for home use.
Pump is of heavy duty construction and submersible
type for long life when pumping ground sewage.
Motor is capacitor start, capacitor run for single
phase. Capacitors and start relay are mounted in the
electrical control box. All single-phase motors must
have special electrical control box furnished by Myers.
Installing single-phase motors with controls other than
Myers voids warranty.
Pump has two oil-filled chambers: 1) the motor and
ball bearings and 2) the seal chamber – for long life
and best heat transfer.
The lower seal above the pump impeller acts as
a buffer for upper seal that holds oil in the motor
chamber. If lower seal leaks for any reason, water
enters the seal chamber. If motor has the seal leak
detector, the electrode will contact the water and
close the circuit to the red seal light in the control
panel, indicating motor must be serviced before upper
seal fails.
Motor Overload Protection: The single phase motor
is provided with an on-winding overload switch. If
motor overloads or overheats for any reason, the
switch opens, stopping motor. As soon as the motor
cools to normal temperature, the switch closes and
restarts the motor. Three-phase motors must be
protected with an overload in the panel.
Motor Power Cords: Pump models with the seal leak
detector use a 5 conductor cord. The three power
conductors are black, white and red. The orange
conductor connects to the seal leak probe and
green conductor connects to the ground screw inside
the cord cap.
Single-phase pumps use the black (common) and
white (run) as main winding leads and the red for the
start winding.
Cord Seal: The lines from the motor chamber are
sealed with a rubber sealing grommet that prevents
oil from leaking into the cord cap compartment. If
necessary to replace power cord, the sealing grommet
must not be loosened. This wire seal is removed only
for complete motor repair that must be done at an
authorized Myers service facility.
IMPORTANT! Ground wires must be connected in the
control box to grounding bar, which is connected per
NEC requirements. Motor is not safe unless properly
grounded.
Three Phase Control Box: Any suitable three phase
control equipment can be used for simplex or duplex
operation. These control boxes are also available
from Myers. If other than Myers box is used, overload
heaters must be selected in accordance with full load
amp ratings.
If any amp readings are higher than listed, it indicates
voltage may be higher or lower than normal, or that
pump grinder may be clogged with trash causing
extra load on motor.
Resistance of Winding: Every motor winding has
a fixed resistance and winding must check close to
the specification values. This winding resistance also
shows if motor is connected for voltage being used.
Use ohmmeter for this test and set on scale to read
directly in ohms.
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