Pentair Myers 4VL, Myers 4VLX, Myers 8SM, Myers 8SMX, Myers 8VL Installation And Service Manual

MODELS 4VL(X*), 8SM(X*),
8VL(X*) and 12VL(X*)

*

Used in Hazardous Locations Class I, Division 1

SUBMERSIBLE SOLIDS
HANDLING PUMPS

INSTALLATION AND SERVICE MANUAL

For use with product built with USEM motor.

NOTE! To the installer: Please make sure you provide this manual to the owner of the equip ment or to the responsible
party who maintains the system.

Part # 23833A643 | © 2014 Pentair, Ltd. | 06/27/14

CAUTION!

Read these safety warnings first before installing,
servicing, or operating any pump.

CALIFORNIA PROPOSITION 65 WARNING:

This product and related
accessories contain chemicals known to the
State of California to cause cancer, birth
defects or other reproductive harm.

GENERAL

1. Most accidents can be avoided by using

COMMON SENSE.

2. Read the operation and maintenance instruction

manual supplied with the pump.

3. Do not wear loose clothing that can become

entangled in the impeller or other moving parts.

4. This pump is designed to handle materials that

could cause illness or disease through direct
exposure. Wear adequate protective clothing when
working on the pump or piping.

15. Make sure lifting handles are securely fastened
each time before lifting.

16. Do not lift pump by power cord.

17. Do not exceed manufacturer’s recommendation
for maximum performance, as this could cause the
motor to overheat.

18. Secure the pump in its operating position so it
cannot tip over, fall or slide.

19. Keep hands and feet away from impeller when
power is connected.

20. Submersible solids handling pumps are not
approved for use in swimming pools, recreational
water installations, decorative fountains or any
installation where human contact with the pumped
fluid is common.

21. Do not operate pump without safety devices
in place.

IMPORTANT! Myers
injury or death resulting from a failure to observe
these safety precautions, misuse or abuse of pumps
or equipment.

®

is not responsible for losses,

ELECTRICAL

WARNING: Only qualified persons shall conduct
services and installations of this pump. The pump
must be wired by a qualified electrician, using an
approved starter box and switching device.

5. To reduce the risk of electrical shock, pump must
be properly grounded in accordance with the
National Electric Code and all applicable state and
local ordinances.

6. To reduce risk of electrical shock, disconnect the
pump from the power source before handling
or servicing.

7. Any wiring to be done on pumps should be done
by a qualified electrician.

8. Never operate a pump with a power cord that has
frayed or brittle insulation.

9. Never let cords or plugs lie in water.

10. Never handle connected power cords with
wet hands.

PUMPS

11. Pump builds up heat and pressure during
operation. Allow time for pump to cool before
handling or servicing.

12. Only qualified personnel should install, operate or
repair pump.

13. Keep clear of suction and discharge openings.

DO NOT insert fingers in pump with power

connected.

14. Do not pump hazardous material not
recommended for pump (flammable, caustic, etc.).

GENERAL INFORMATION:

Pump Models: These instructions cover the

installation and service of the Myers 4VL, 4VLX, 8VL,
8VLX, 8SM, 8SMX, 12VL, and 12VLX series solids
handling submersible pumps. The 4VLX, 8VLX, 8SMX
and 12VLX models are Factory Mutual approved
and listed hazardous location for hazardous sewage
locations Class I, Division 1.

Motor HP and Voltages: These solids handling
pumps are offered in three phase wiring configuration
only. Voltages and speeds will vary according to
the application and can be seen in the tables in
this manual.

Electrical Controls: All of these pump models must
be used with a control panel. Myers built control
panels are designed to supply the correct electrical
controls, motor starting equipment and include
the circuitry for moisture and heat sensors. It is
recommended that a Myers built control panel is used
so that all warranties apply.

General Construction: The 4VLX, 8VLX, 8SMX
and 12VLX motor construction is designed to meet
Factory Mutual requirements for Class I, Division 1,
sewage applications. These models are certified and
nameplated with this approval. The motor chamber
and seal chamber are filled with a high dielectric
type oil for improved lubrication and heat transfer
of the bearings and motor. Since the bearings have
been designed for 50,000 hours of life, the oil should
never require replacement under normal operating
conditions. An air space above the oil level in both
the seal and motor chambers is provided to allow the
expansion of the oil when at operating temperature.

2

The power and control lines are sealed and strain
relieved on the outside entrance with a standard cord
grip, and internally through the use of a dielectric
potting resin surrounding the electrical wires. All of the
pump fasteners and shafts are made from corrosion
resistant stainless steel, while the pump castings are
made of ASTM A-48 Class 30 cast iron. The wear
ring is bronze and all impellers are two vane enclosed
solids handling design made of ductile iron.

General Installation: Various configurations
and methods of plumbing this series of solids
handling pumps may be used; however, for ease of
installation and service a Myers® rail lift-out system
is recommended.

Note: If hazardous location pumps are used in
conjunction with a rail lift-out system, it must be a
Factory Mutual approved non-sparking, hazardous
location system. The Myers approved lift-out
models are:

4" Lift-Out 8" Lift-Out 12" Lift-Out
SRAX44HH SRAX88 SRAX1212

If these guidelines are not followed, the Factory
Mutual hazardous location approval is void.

Note: Failure to use proper circuitry and to connect
the motor overheat protection in the control
panel would negate all warranties and Factory
Mutual Approval.

Motor Seal Failure Warning: The seal chamber is
oil filled and provided with moisture sensing probes
to detect water leakage through the lower shaft seal.
The probes can also detect moisture present in the
upper motor housing.

The presence of water energizes a red seal leak
warning light at the control panel. This is a warning
light only, and does not stop the motor. It indicates
a leak has occurred and the pump must be repaired.
Normally, this indicates the outboard seal has leaked.
Allowing the unit to operate after the warning could
cause upper seal leakage along with motor failure.

The resistance across the moisture seal (seal failure)
probes should be checked after a seal leak warning
light has lit. This can be done by disconnecting the
red and orange control wires from the control panel,
and measuring the resistance with an ohmmeter
between the wires. If the measured values are below
specification, then the pump may have a lower seal
failure and require service.

Hazardous Location Service: These pumps are to
be used for handling sewage, wastewater and storm
water only. Do not use in other hazardous locations.
These motors must be repaired and serviced only at
Myers Authorized Service Centers or at the Myers
factory. Any unauthorized field repair voids the
warranty, the hazardous location rating, and Factory
Mutual approval.

CAUTION: After the pump is installed and sewage
has entered the basin there are methane and
hydrogen sulfide gases, which are poisonous.
Never enter a wet well unless the cover is open
for a sufficient period of time to allow fresh air
into the basin. Myers recommends using the rail
lift-out system so that no service is required
inside the basin.

Motor: Each motor is provided with heat sensor

thermostats attached directly to the motor windings.
The thermostats open if the motor windings see
excessive heat and, in turn, open the motor contactor
in the control panel, breaking the power to the pump.
When the motor is stopped due to an overheated
condition, it will not start until the motor has cooled
and the heat sensor reset button is manually pushed
on the front of the Myers control panel. This circuitry
is provided in the Myers control panel designs.

The thermostats are set to open at a temperature of
302º F (150ºC). The maximum contact rating is 18
amps at 115 VAC and 12 amps at 230 VAC. Motor
winding insulation is good for Class F (311ºF, 155ºC,
or higher).

On the Myers hazardous location control panels
the seal leak test switch tests the seal leak circuitry
continuity. When pushed the seal leak test bulb
should light. If the test bulb does not light it means
either the wiring circuitry to the seal leak probes has
been broken or the bulb has burned out.

Note: Myers built control panels supply the correct
circuitry for moisture and heat sensor connections.
Failure to install the correct circuitry with proper
connection would negate warranty and Factory
Mutual Approval.

Motor Power Cord, Control Cord and Cord Cap
Assembly: Each motor power cord has 4 conductors

– white, black, red and green. For a three phase
motor the red, black and white conductors connect
to the three line leads, and the green is connected
to a good ground. Interchanging any two leads will
reverse the rotation of the motor.

Note: Rotation should be clockwise when observed
from the top of the pump. This can be checked by
noting which direction the pump torque is upon initial
starting. A properly rotating pump will torque counter­clockwise upon start.

The control cable has 5 conductors – black, white,
red, orange and green. White and black connect to
the heat sensor terminals in the control panels; red
and orange connect to the seal failure terminals in the
control panel; and the green connects to the ground in
the control panel.

3

The cord cap is epoxy potted. The cord cap provides
for a sealed wire connection with terminals so that
connections can be made without breaking the
motor seal. This allows the cord cap, with cords, to
be removed from the motor. An approved hazardous
location junction box is required for hazardous
locations.

Note: Each cable has a green ground wire and must
be properly grounded per the National Electric Code
and local codes.

Electrical Motor Controls: All electrical controls
and motor equipment should be as specified in these
instructions. Consult factory for any acceptable
alternatives. For hazardous locations the controls and
control panel must be installed outside the hazardous
area, or approved hazardous location controls that are
intrinsically safe must be used.

Junction Box: If a junction box is used in a
hazardous location, it must be a hazardous location
approved type with hazardous location cord
connectors. Wires from the junction box must pass
through a hazardous location seal connector.

Level Sensing Controls: Intrinsically safe type
float controls are recommended for all applications
and required for hazardous location service. An
intrinsically safe control panel relay will limit the
current and voltage to the level controls. A Myers®
control panel can be supplied with this type circuitry.

The float level controls maintain the basin sewage
water level by controlling pump turn-on and turn­off levels.

1. The lower turn-off control should be set so that
the pump stops at approximately the top of the
pump. Consult the factory for any settings below
this point.

2. The upper turn-on control should be set above the
lower turn-off control. The exact height between
the 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.

Electrical Connections: All electrical wiring must
be in accordance with local code and only qualified
electricians should make the installations. All wires
should be checked for shorts to ground with an
ohmmeter or megger after the connections are made.
This is important, as one grounded wire can cause
failure of the pump, control panel or personal injury.

Pump: The fluid end of the pump is field serviceable
and can be disassembled in case of wear, damage,
plugging or outboard seal failure. The following will
describe the disassembly and reassembly process.

Disassembly

1. With the pump located in a secure place, remove
the bolts fastening the seal housing to the volute.
The motor and impeller can now be removed as
a unit.

2. Lay the unit down on its side. If the lower seal is
to be removed, it is recommended that the oil in
the seal chamber be drained. This can be done by
removing the lower seal chamber plug and draining
the oil into a holding container.

3. To remove the impeller, first remove the bolts from
the nose cone. The nose cone will pull off. Using
a proper wrench, the impeller retaining bolt and
washer must be removed. This may require a
piece of wood placed between the vanes to keep
the impeller from rotating while removing the bolt.
Once the bolt has been removed, tap lightly with
a hammer around the outside diameter of the
impeller to loosen from tapered shaft and key.

CAUTION – The impeller is large and heavy and

will need to be supported.

4. If the lower seal needs to be removed, first remove
the compression spring that rides between the
impeller and the seal assembly. Next remove
the compression ring that surrounds the rubber
bellows on the rotating portion of the seal
assembly. Again using screwdrivers, pry the
remaining portion of the rotating seal assembly off
the shaft. The ceramic stationary can be removed
by placing a screwdriver between the rubber and
the ceramic face and then prying, working around
the entire diameter. Note, these parts should be
discarded and a new seal assembly installed.

5. If the oil in the seal chamber was drained, examine
the contents to determine if the upper seal has
been damaged. Sign of grit or other abrasive
material may indicate that the upper seal has also
been damaged. Pressurizing the motor housing
assembly between 7 and 10 psi and observing any
drop in pressure will indicate if the upper seal is
functioning properly.

Note: Upper seal repairs must be done at a

Myers Authorized Service Center or at the
Myers factory. Any unauthorized field repair
voids warranty and the hazardous location
approval on the Factory Mutual listed pump.

6. The wear ring can be removed from the volute for
repair or replacement.

4