Pentair Myers VH30, Myers VH75, Myers VS50, Myers VS30, Myers WG30 Installation And Service Manual
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HIGH CAPACITY
GRINDER PUMP
WG
HIGH HEAD
GRINDER PUMP
WGH
HIGH HEAD AND
HIGH CAPACITY VS30, VS50,
VH30, VH50, VH75 SERIES
VS30, VH30, VS50, VH50 and VH75
WG30, WG30H, WG50, WG50H andWG75H
GRINDER PUMPS
INSTALLATION AND SERVICE MANUAL
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 # 13800A876 | © 2016 Pentair plc | 09/09/16
Pump Models: The 3, 5, and 7½ HP grinder pumps
are made in four models, the WG, WGH, VS and VH.
These pumps are made for single phase 230 volts and
three phase for 200, 230, 460 and 575 volts.
Instructions: These instructions cover only the
pump unit. Other instructions for lift-out rail system
and electrical controls are included with those items.
Complete disassembly instructions are furnished only
to authorized service stations.
CAUTION: PUMP IS NOT TO BE
DISASSEMBLED IN THE FIELD EXCEPT AT AN
AUTHORIZED SERVICE STATION OR AT THE
MYERS® FACTORY. WARRANTY IS VOID IF
PUMP IS TAKEN APART FOR ANY REASON
EXCEPT TO REPLACE GRINDER IMPELLER
AND GRINDER RING.
Both cords are the same for single and three phase.
The wires are color coded blue, black, red and green.
For 3 phase the blue, black and red lines are power
lines and the green is ground. For single phase the
black and blue lines are power and the red is for start
winding and the green is ground. Per NEC, blue wire
may be indicated by blue tape affixed to white wire.
Any three phase motor can be reversed by
interchanging any two line leads. Single phase
motor is single rotation only. Correct motor rotation
is counterclockwise when looking at the grinder
end of pump.
The black and blue leads of the control cord connect
to heat sensor and the red conductors connect to seal
failure; green is ground. Per NEC, blue wire may be
indicated by blue tape affixed to white wire.
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.
These pumps are designed for the rugged service
of grinding and pumping commercial and industrial
sewage. They are not intended for pumping
heavy slurries or liquids containing abrasives or
corrosive elements.
Three phase motors are generally used for commercial
and industrial service, but single phase motors
are available where 3 phase cannot be obtained,
especially in rural areas. Transformers must be large
enough to maintain full voltage for single phase.
Low voltage on large single phase motors can cause
considerable trouble and motors are not guaranteed to
operate on low voltage. All single phase motors must
have a special electrical control box furnished
by Myers.
INSTALLING SINGLE PHASE MOTORS
WITH CONTROLS OTHER THAN MYERS
VOIDS ALL WARRANTIES.
Pump motor chamber and seal chamber are oil filled
for long life and best heat transfer.
The seal chamber is provided with an electrode to
give a signal to control panel if water enters the seal
chamber due to worn or faulty lower seal.
Motor is provided with a heat sensor that automatically
stops motor if overheating occurs for any reason. This
sensor resets as soon as motor temperature drops to
safe range. Additional overload heaters are used in the
control box to trip under overload conditions.
All green ground wires connect to screw terminal in
motor connection housing and to grounding bar in
electrical control box.
IMPORTANT! These ground wires must be
connected in control box to grounding bar that is
connected to a good outside ground. MOTOR IS NOT
SAFE UNLESS GROUNDED.
Installing Pump in Sump: These pumps are
usually installed in concrete or fiberglass basins with
the lift-out rail system.
If pump is not installed with lift-out rail system it must
be properly supported to discharge pipe so that space
is provided under the pump for entrance of sewage.
Pump inlet should not be closer than 5 inches from
bottom of sump.
Starting Pump After Installing in Sump Basin: If
pump is 3 phase, pump rotation must be checked.
Before lowering pump into basin, connect power
lines and start motor using H-O-A switch in the Hand
position. Grinder impeller should turn counterclockwise
when looking at grinder impeller. If rotation is wrong,
interchange any two line leads at control box.
CAUTION: Keep hands completely away from
grinder impeller when making this check.
Disconnect line leads from panel and mark wires
so they can be reconnected in same manner as used
for test.
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, overoad
heaters must be selected in accordance with full load
amp ratings.
Motor Cords: Each pump motor has two cords, one
large power cord and one small control cord.
Single Phase Control Box: Single phase pumps must
use the Myers control box.
Warranty is void if non-Myers single phase control box
is used.
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CHECKLIST IF PUMP DOES NOT
OPERATE PROPERLY
Checking for Moisture in Motor: Use ohmmeter and
set on highest scale. Readings on the large power cord
between any of the conductors red, black, blue to green
conductor or motor shell should be more than 500,000
ohms. Motor probably will run with a lower reading, but
if pump is out of service and reading is below 500,000
ohms, the motor housing and stator should be serviced
at an authorized service facility.
Readings should be taken with line leads disconnected
from terminal strip.
Resistance of Windings: Every motor winding has
a fixed resistance, and winding must check close to
the values given to operate properly. 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.
REPLACING GRINDER COMPONENTS
5. Make sure pocket in volute is clean and reinstall
stationary cutter plate using the four socket head
cap screws. Apply blue Loctite® to the threads.
Do not overtighten cap screws.
6. Replace ring shims (if removed from the shaft)
and thread rotating cutter onto shaft. Make sure
threads on shaft are clean and use Never-Seez®
or other graphite compound on threads before
replacing rotating cutter.
7. Using a rubber mallet, or soft metal hammer,
bump rotating cutter in clockwise direction to
make sure it is seated on the impeller.
8. To ensure proper operation of the cutter
mechanism, the gap between the stationary cutter
plate and rotating cutter must be no more than
.010". To check the gap use a .010" feeler gauge.
If the .010" feeler gauge does not fit between the
surface of the stationary cutter and rotating cutter
and the motor shaft turns freely, the gap is set
correctly. If the .010" feeler gauge fits between
the surfaces, shims must be removed to close the
gap.
This is the only disassembly operation allowed in the
field. All other repairs must be done at the factory or at
an authorized service facility.
IMPORTANT! Pump should be thoroughly cleaned
of trash and deposits before starting disassembly
operations.
CAUTION: DISCONNECT ALL POWER AND
CONTROL WIRES TO MOTOR AT CONTROL
PANEL BEFORE STARTING DISASSEMBLY
OPERATION. NEVER RELY ON OPENING CIRCUIT
BREAKER ONLY.
DISASSEMBLY OF STATIONARY CUTTER
PLATE AND ROTATING CUTTER:
VS and VH SERIES
1. Remove retaining washer and screw from end of
shaft. A screwdriver can be used to hold the shaft
in place by wedging it between one of the four
socket head cap screws and the rotating cutter
while loosening the screw.
2. Using a rubber mallet, or soft metal hammer,
bump rotating cutter in counterclockwise direction
as thread is right-hand. Unthread rotating cutter
from shaft. Be careful to not lose ring shims that
space the rotating cutter from the stationary cutter
plate.
3. Remove four socket head cap screws holding
the stationary cutter plate to the volute. Remove
stationary cutter from volute. If stationary cutter
is stuck, the socket head cap screws can be
threaded into tapped back-off holes in plate.
Tighten screws to remove plate from volute.
4. Inspect rotating cutter and stationary cutter plate
for wear and replace if worn.
9. Replace retaining washer and screw in the end of
the shaft. Be sure screw is tight. A screwdriver can
be used to hold the shaft in place by wedging it
between one of the four socket head cap screws
and the rotating cutter while tightening the screw.
10. Be sure shaft turns freely after reassembly. Some
drag will occur due to the seal, but there should
be no binding or tight spots when turning the
rotating cutter.
11. If rotating cutter rubs or drags on stationary cutter
plate, recheck gap and re-shim rotating cutter.
REPLACING GRINDER IMPELLER AND
GRINDER SHREDDING RING: WG AND
WGH SERIES
1. Remove screws from holding ring and
remove ring.
2. Use two screwdrivers, one each on opposite sides
of ring, and pry off snap ring that holds shredding
ring in place. Remove shredding ring.
3. Hold impeller by prying against impeller cutting
bar and remove cap screw from end of shaft.
4. Use large screwdriver in slot in end of shaft and
bump on cutter vane with plastic hammer. Bump
in counterclockwise direction as thread
is right hand. It may take several bumps to
loosen impeller.
If impeller cannot be loosened, it will be necessary
to take unit to service facility for service. DON’T
CONTINUE TO POUND ON IMPELLER AS
IMPELLER AND SHAFT CAN BE DAMAGED.
5. If impeller comes off easily, clean up and replace
if worn.
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6. Be sure pump impeller has not loosened when
grinder impeller is removed. This can be checked
on reassembly of grinder impeller and shredding
ring. Tips of impeller cutter vanes should extend
about 1/8" below bottom of shredding ring. If
more than 1/8" extends below ring it means pump
impeller has loosened.
Remove grinder impeller and ring, remove bolts
from pump case and remove case. Use back-off
screws in motor mounting plate to pry loose from
pump case.
7. After case is removed wrap emery paper around
shaft and hold with vise grip pliers. Use cloth on
impeller and screw up against shroud. Now pump
can be reassembled.
8. Clean all threads with wire brush and file smooth
any threads that may be nicked.
5. If pump has been installed for some time and does
not pump, it may be clogged at grinder inlet.
6. Discharge gate valve may be closed.
7. Discharge check valve may be clogged or have a
broken clapper.
8. Discharge head may be too high. Check elevation.
Maximum pump head at zero flow is shown on
pump curve sheet.
9. If above checks do not locate trouble, motor rotor
may be loose on shaft which allows motor to run
but will not turn impeller or only at low RPM.
Red light comes on at control box.
1. This indicates some water has leaked past the
lower seal and has entered the seal chamber and
made contact with the electrode probe. Pump
must be removed from basin immediately for
replacement of lower seal. This preventive repair
will save an expensive motor.
9. Use graphite compound on threads before
replacing grinder impeller.
10. Be sure cap screw in bottom of shaft is tight. Hold
impeller with screwdriver between cutter bar and
teeth of shredding ring while tightening cap screw.
11. Be sure impeller turns free by hand after
reassembly. Some drag will occur due to seals but
there should be no binding or tight spots when
turning the grinder impeller.
12. ALWAYS use a rag on the impellers when turning
to prevent cutting hands on the sharp corners of
shredding ring.
PUMP TROUBLESHOOTING
TROUBLE CHECKLIST
Troubles listed are generally caused by the pump.
Other troubles can occur from faulty control box
operation. These will be listed with the control box
instructions.
Pump runs but does not pump liquid from base.
1. Pump impeller may be air locked; this occasionally
occurs on a new installation. Start and stop pump
several times to purge air.
2. Run additional water into basin so that pump will
be submerged deeper to clear air.
3. If pump is three phase, rotation may be wrong. See
instructions for checking proper rotation.
4. If air does not clear it may be necessary to lift
pump out of sealing elbow and start motor to allow
pump to pump for a few seconds. Air vent hole is
provided in pump case, so some water will flow
from this hole when pump is operating. If vent hole
gets clogged, clean out.
Overload trips at control box and alarm buzzer or
flashing red light comes on due to high water level
in basin.
1. Push in on red reset button to reset overload. If
overload trips again after short run, pump has
some damage and must be removed from basin
for checking.
2. Trouble may be from clogged grinder causing
motor to overload or could be from failed motor.
3. Trouble may be from faulty component in
control box. Always check control box before
removing pump.
Yellow run light stays on continuously.
1. Indicates H-O-A switch may be in the Hand
position.
2. Level control switch may have failed causing pump
to continue to operate when water is below lower
weight, or lower weight may have dropped off.
3. Grinder assembly may be partially clogged causing
pump to operate at much reduced capacity.
4. Gate valve or check valve may be clogged causing
low pump flow.
5. Pump may be air locked.
Circuit breaker trips.
1. Reset breaker by pushing clear down on handle
then back to On position. If breaker trips again in
few seconds it indicates excessive load probably
caused by a short in the motor or control box.
Check out instructions given with control box
before pulling pump.
2. If this condition happens after an electrical
storm, motor or control box may be damaged by
lightning.
3. Resistance reading of the motor with lead wires
disconnected from the control box can determine if
trouble is in motor or control box.
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