Pentair Myers DRY PIT 4VCDP Manual

NOTE! To the installer: Please make sure you provide this manual to the owner of the equipment or to the responsible
party who maintains the system.
DRY PIT
SOLIDS HANDLING
DRY PIT PUMPS
INSTALLATION AND SERVICE MANUAL
Part # 05625-556-1 | © 2013 Pentair Ltd. | 11/18/13
4VCDP

05625-556-1 11/18/13 2
GENERAL
Shipping: When unpacking unit, check for concealed
damage. CLAIM FOR DAMAGE MUST BE MADE AT
THE RECEIVING END THROUGH THE DELIVERING
CARRIER. DAMAGE CANNOT BE PROCESSED
FROM THE FACTORY.
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.
Pumps Not Operating or in Storage: Pumps with
carbon ceramic seals must have impellers manually
rotated (6 revolutions) after setting nonoperational for
3 months or longer and prior to electrical start-up.
Pumps with carbide seals must have impellers
manually rotated (6 revolutions) after setting
nonoperational for 3 weeks or longer and prior to
electrical start-up.
Seal Failure: An electrode is installed in the seal
chamber so if water enters the chamber through the
first seal, the electrode will be energized and a signal
will be transmitted to the sensing unit at ground
surface, causing an alarm activation. The electrode
probe is installed in all units, but the sensing unit is
supplied at an extra cost and must be ordered.
In operation the seal failure unit indicates only that
there is some water in the seal chamber. The pump
will continue to operate, but the seal should be
checked immediately after failure is indicated.
The sensing unit is recommended on all installations
as good insurance against motor failure.
Pump: The dry pit submersible pump is supplied for
3 phase and for 200, 230, 460 or 575 volts. Power
cable is supplied with green wire to connect to a good
ground such as water pipe or ground stake.
Heat Sensors: All motors have heat sensor units
embedded in the motor winding to detect excessive
heat. The heat sensors are set to trip at 120ºC. The
sensors automatically reset when the motor cools to
safe temperature.
The sensors are connected in series with the
motor starter coil so that the starter is tripped if
heat sensor opens. The motor starter is equipped
with overload heaters so all normal overloads are
protected by the starter.
IMPORTANT: If Myers®electrical starting
equipment is not supplied, the heat sensor circuit
must be connected in series with the starter coil or
warranty is void.
Wet Well Level Control: Sump level is controlled by
Myers switch controls. The float is held in position
in the sump by a weight attached to the power cord
above the float. The cord supports the float and is
adjusted for height from the surface.
Duplex systems use three controls: one set at turn-off,
one set at turn-on for one pump, and one set at turn-
on for both pumps. Pumps then alternate lead and
lag on each successive cycle. Two pumps operate
together only when the sump level rises to the third or
override control. The override control also brings on
the second pump in case of failure of the first pump.
Extra floats with appropriate controls can be supplied
for alarm functions. Triplex systems use four controls:
One set at turn-off, one set at turn-on for one pump,
one set at turn-on for two pumps, and one set at turn-
on for three pumps. The pumps alternate with each
successive cycle.
Three pumps operate together only if the sump level
rises to the fourth control (second override). This
control also brings on the third pump in case of failure
of either or both of the first two pumps.
Alarm Controls: The alarm level is usually set above
the override level so the alarm will signal only if the
override level is exceeded. However, some engineers
prefer to have the alarm level set below the override
level as it is possible for one pump to fail and the
other pump to operate on the override level with the
sump level never reaching the alarm level. This is
particularly true in cases of low inflow capacity.
Electrical Control Panel: It is recommended that the
Myers control panel be used with all pumps as proper
starter heaters and connections for heat sensor wires
are furnished.
Myers electrical equipment is installed in a
weatherproof NEMA 3R enclosure. The electrical
equipment includes a main circuit breaker for each
pump, a magnetic starter with overload protection
for each pump, an H-O-A switch and a run light for
each pump, an electrical alternator and a transformer
to provide appropriate control for control circuit
and alarms.
Overload Heaters: Starters with 3 leg overload
protection must be supplied if the Myers electrical
panel is not used. The heaters must be sized in
accordance with the nameplate amps on the motor.
The amp draw on these oil-filled motors is slightly
higher than a corresponding horsepower surface
motor, so heaters must be sized by the
nameplate rating.
INSTALLATION INSTRUCTIONS
Installing Pump in Dry Pit: Before installing pump
in the dry pit, lay it on side and turn the impeller
manually. The impeller may be slightly stuck due to

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3
factory water testing, so it must be broken loose with
a small bar or screwdriver in the edge of the vanes.
The impeller must turn freely.
Clean all trash and debris from pump installation area
and connect pump to plumbing.
A check valve must be installed on each pump. A
gate or plug valve in each pump discharge line is also
recommended. This valve should be installed on the
discharge side of the check valve so the line pressure
can be cut off to service the check valve. Single pump
systems are sometimes installed without a check
valve where it is desirable to self drain the discharge
line to prevent freezing. This can be done only with
short discharge lines. Otherwise water will return to
the sump and cause short cycling of the pump.
Mounting Pump Stand: The pump will ship from
the factory on a dry pit pump stand. The suction and
discharge of the pump will be oriented at the factory
per the prescribed customer order.
The dry pit pump must be anchored to the pump
station floor. This must be done to alleviate stress
on the suction and discharge piping while the pump
is in service. When securing the pump stand to the
contractor supplied anchor bolts, it may be necessary
to shim the stand to ensure the suction and discharge
piping properly aligns.
Plumbing (General): The site contractor must supply
the use of necessary pipe hangers or other piping
supports. Both the suction and discharge piping must
be independently supported and properly aligned
to ensure no strain is transmitted to the pump when
connections are tightened. The use of expansion
joints or vibration pads does not preclude the need to
properly support the piping.
NOTE: Do not support the piping by the pump. Do
not force piping when making connections.
Suction-Inlet Piping: The correct sizing and
installation of the suction plumbing is particularly
important. The suction piping must be selected and
installed in such a manner that it minimizes pressure
losses and allows for sufficient flow during starting
and operation. Most NPSH problems can be traced
directly to improper design of suction piping systems.
It is recommended that the piping be as direct as
possible and the length should be at least 10 times
the diameter of the pipe. When a pipe diameter larger
than the suction of the pump is used, an eccentric
reducer should be used with the eccentric side down.
This will allow for the elimination of a potential air
pocket in the suction plumbing.
NOTE: A pipe diameter smaller than the suction of
the pump must never be used.
It is also recommended that a valve be installed in
the suction piping to isolate the pump during routine
maintenance and shutdown. A globe valve should not
be used when NPSH is critical.
It is recommended that a compound pressure
gauge be installed in the suction piping to assist in
troubleshooting potential performance problems.

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Discharge-Outlet Piping: The discharge piping for
short runs can be of the same size as the discharge of
the pump. It is recommended that longer runs be 1 to
2 sizes larger depending on the length. Any elevated
points will retain air pockets, and it is recommended
that air vents or bleed lines be installed at these points
to evacuate entrapped air. Installation of a valve near
the discharge of the pump is recommended to isolate
the pump during maintenance and shutdown.
It is recommended that a pressure gauge be
installed near the discharge of the pump to assist in
troubleshooting potential performance problems.
NEMA 4 Junction Box (Optional): A NEMA 4
junction box should be used to make power
and control connections if electrical control
panel is to be set remote from the pump station.
The Myers®NEMA 4 junction box is provided
with compression connections for sealing all
wires. No sealing compound is needed to make
connections waterproof.
Wiring diagrams are provided with the panel for
making connections. An extra set of diagrams is
included so that one set can be used in the station
when making connections. The size wire to use from
panel to station depends on motor size and distance
in feet.
Be sure each wire is checked out so that a wrong
connection will not be made. An ohmmeter or Megger
can be used to check the continuity.
Installing Switch Controls: The controls are
supported by a mounting bracket that is attached to
wet well wall, cover or to the NEMA 4 junction box.
Control level can be changed at any time by loosening
the snubber and readjusting cord length.
In either a simplex or duplex system, the lower or
turn-off control is set just above the drywell inlet. This
is dependent on the inlet velocity of the pump. The
second or turn-on control is set at least 24 inches
above the lower turn-off control.
More distance between turn-on and turn-off
controls can be used, but sewage may become
septic, and excessive solids may collect for the
pump to handle. A frequent pumping cycle is
recommended for best operation.
If an alarm system is used, this control is usually set
about 6 inches above the override control.
Making Electrical Connections: All electrical wiring
must be in accordance with local codes, and only
certified electricians should make the installations.
All wires should be checked for ground with an
ohmmeter or Megger after the connections are made.
THIS IS IMPORTANT AS ONE GROUNDED WIRE CAN
CAUSE CONSIDERABLE TROUBLE.
IMPORTANT: If equipment is not properly wired
and protected as recommended, the warranty
is void.
Heat Sensors and Seal Failure Connections: Be
sure heat sensor wires are connected in series with
the starter coil. Connections are provided on the
terminal strip.
DO NOT CONNECT POWER TO THESE LINES AT
ANY TIME.
Cooling Fins (Optional): When additional cooling is
required, cooling fins are permanently adhered to the
motor housing at the factory. Inspect the cooling fins
to ensure that they are intact and not damaged prior
to plumbing the pump in the system.
NOTE: The cooling fins must be intact to
ensure the pump operates within the factory
specified temperature.
Water Jacket (Optional): When additional cooling is
necessary, a water jacket is supplied from the factory.
All necessary plumbing of the water jacket is supplied
from the factory connecting to the suction and the
discharge piping. The plumbing includes ball valves
allowing for removal of the water jacket for periodic
cleaning without shutting the system down.
The water jacket is held in place by clamps and is
sealed both top and bottom by O-rings. Upon removal
of the water jacket for cleaning, care should be taken
not to damage the O-rings and replace if necessary.
NOTE: Clean, fresh water supplied to the water
jacket will reduce the necessity of frequent
periodic cleaning of the water jacket. This does
not preclude that the water jacket should not
periodically be cleaned.

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5
PUMP OPERATION
Starting System:
1. Turn H-O-A switch to Off position and then turn on
main circuit breakers.
2. Open all discharge valves and allow water to rise in
wet well.
3. Turn H-O-A switch to Hand position on one pump
and notice operation. If pump is noisy and vibrates,
rotation is wrong. To change rotation, interchange
any two line leads to a three phase motor only. DO
NOT INTERCHANGE MAIN INCOMING LINES.
If duplex system, check second pump in the
same manner.
4. Now set H-O-A switch to Auto position and allow
water to rise in the wet well until the pump starts.
Allow pump to operate until the level drops to turn-
off point.
5. Allow wet well level to rise to start the other pump.
Notice run lights on the panel. Pumps should
alternate on each successive cycle of operation.
6. Turn both H-O-A switches to Off position and allow
wet well to fill to the override control level.
7. Turn both switches to Auto position and both
pumps should start and operate together until level
drops to turn-off point.
8. Repeat this operation cycle several times before
leaving job site.
9. Check voltage when pumps are operating and
check amp draw of each pump. Check amps on
each wire, as sometimes a high leg will exist. One
leg can be somewhat higher (5 to 10%) without
causing trouble. For excessive amp draw on one
leg, the power company should be consulted.
Phase Converters: Phase converters are generally
not recommended, but in cases where only single
phase current is available, phase converters can
be used. Be sure to size the phase converter large
enough for the amp draw specified on the motor
nameplate, not necessarily by motor horsepower. The
warranty of all three phase submersible motors is void
if operated with single phase power through a phase
converter and 3 leg ambient compensated extra-quick
trip overload protectors are not used.
PUMP MAINTENANCE
Lubrication or other maintenance is not required, as
the motors are oil filled.
Generally, these pumps give very reliable service, and
can be expected to operate for many years without
failure under normal operating conditions.
Lightning: In some areas where considerable
lightning occurs, we recommend that a lightning
arrestor be installed at the control panel. Lightning
arrestors are good insurance against damage to an
expensive motor.
Servicing Instructions:
IMPORTANT: Read all instructions prior to
replacing any parts.
WARNING: Before handling these pumps
and controls, always isolate and disconnect
power first.
Do not smoke or use any sparkable electrical
devices or flames in a septic (gaseous) or possible
septic environment.
Field Service on Motor: Any pump, in warranty, must
be returned to the factory for service or repaired at
an authorized Myers®service center. Charges will
not be allowed if in warranty pump is not taken to an
authorized Myers service center.
Replacing Seals and Bearings:
1. Drain all oil from motor chamber and seal chamber
as described.
2. Remove motor housing as described.
3. Remove bolts that hold seal chamber to pump
housing. Use back-off screws to break loose.
4. Lift rotating assembly (rotor, shaft, and impeller)
from pump case and place it horizontally on bench.
5. Remove impeller by holding the rotor and removing
the impeller retaining washer and bolt. The
impeller will be taper fitted to the shaft with a key.
The impeller may need to be jarred from the shaft
by tapping with a block of wood.
6. A shaft sleeve may be used in conjunction with the
lower seal and will need to be removed.
7. Remove lower seal spring and pry out the seal with
a screwdriver.
8. To remove the seal housing, take out socket head
bolts and using the bolts in the back-out holes,
pry plate loose. This will force out lower seal if not
already removed.
9. Remove snap ring that holds upper seal. Pull seal if
it is free. If not free, it can be forced off when shaft
is removed.
10.Remove bolts that hold bearing housing in place.
Set assembly in upright position and bump end
of shaft with hardwood block. This will push the
bearing from the housing and will force upper seal
from shaft.
11.Use a bearing puller to remove bearings. Replace
with new bearings. Press only on inner face of the
bearing when replacing. Pressing on the outer
face can damage the bearing.
IMPORTANT: DO NOT USE ANY OF THE OLD
SEAL PARTS. REPLACE WITH ALL NEW SEALS.
12.Thoroughly clean all castings before replacing
seals. Any dirt between the seal faces can
cause failure.

05625-556-1 11/18/13 6
13.Examine all O-rings for nicks before using and
replace damaged O-rings with new ones.
14.Use Loctite®on socket head impeller locking
screw in end of shaft.
PUMP TROUBLESHOOTING
Pump will not start.
1. No power to the motor. Check for blown fuse or
open circuit.
2. Selector switch may be in the Off position.
3. Control circuit transformer fuse may be blown.
4. Overload heater on starter may be tripped. Push
to reset.
Pump will not start and overload heaters trip.
1. Turn off power and check motor leads with Megger
or ohmmeter for possible ground.
2. Check resistance of motor windings. All 3 phases
should show the same reading.
3. If no grounds exist and the motor windings check
OK, remove discharge elbow cover and check for
clogged or blocked impeller.
Pump operates with selector switch in Hand
position but will not operate in Auto position.
1. This indicates trouble in the float level control or
alternator relay.
2. Check control panel for trouble.
Pump runs but will not shut off.
1. Pump may be air locked. Turn pump off and let set
for several minutes, then restart.
2. Lower float control may be hung up in the closed
position. Check in wet well to be sure the control
is free.
3. Selector switch may be in the Hand position.
Pump does not deliver proper capacity.
1. Discharge gate valve may be partially closed or
partially clogged.
2. Check valve may be partially clogged. Raise lever
up and down to clear.
3. Pump may be running in the wrong direction. Low
speed pumps can operate in reverse direction
without much noise or vibration.
4. Discharge head may be too high. Check total head
with gauge when the pump is operating.
5. If pump has been in service for some time and
capacity falls off, remove pump and inspect
impeller for wear.
Motor stops and then restarts after short period
but overload heaters in starter do not trip.
1. This indicates heat sensors in the motor are
tripping due to excessive heat. Impeller may be
partially clogged giving sustained overload but not
high enough to trip overload heaters.
2. Pump may be operating on a short cycle due to
faulty check valve in the wet well.

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STANDARD LIMITED WARRANTY
Myers®warrants its products against defects in material and workmanship for a period of 12 months from the date
of shipment from Myers or 18 months from the manufacturing date, whichever occurs first - provided that such
products are used in compliance with the requirements of the Myers catalog and technical manuals for use in
pumping raw sewage, municipal wastewater or similar, abrasive free non-corrosive liquids.
During the warranty period and subject to the conditions set forth, Myers, at its discretion, will repair or replace to
the original user, the parts which prove defective in materials and workmanship. Myers reserves the right to change
or improve its products or any portions thereof without being obligated to provide such a change or improvement
for prior sold and/or shipped units.
Start-up reports and electrical schematics may be required to support warranty claims. Submit at the time of start
up through the Myers website: http://forms.pentairliterature.com/startupform/startupform.asp?type=m.
Warranty is effective only if Myers authorized control panels are used. All seal fail and heat sensing devices must
be hooked up, functional and monitored or this warranty will be void. Myers will only cover the lower seal and labor
thereof for all dual seal pumps. Under no circumstance will Myers be responsible for the cost of field labor, travel
expenses, rented equipment, removal/reinstallation costs or freight expenses to and from the factory or an
authorized Myers service facility.
This limited warranty will not apply: (a) to defects or malfunctions resulting from failure to properly install, operate or
maintain the unit in accordance with the printed instructions provided; (b) to failures resulting from abuse, accident
or negligence; (c) to normal maintenance services and parts used in connection with such service; (d) to units which
are not installed in accordance with applicable local codes, ordinances and good trade practices; (e) if the unit is
moved from its original installation location; (f) if unit is used for purposes other than for what it is designed and
manufactured; (g) to any unit which has been repaired or altered by anyone other than Myers or an authorized
Myers service provider; (h) to any unit which has been repaired using non factory specified/OEM parts.
Warranty Exclusions: MYERS MAKES NO EXPRESS OR IMPLIED WARRANTIES WHICH EXTEND BEYOND
THE DESCRIPTION ON THE FACE HEREOF. MYERS SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR ANY PARTICULAR PURPOSE.
Liability Limitation: IN NO EVENT SHALL MYERS BE LIABLE OR RESPONSIBLE FOR CONSEQUENTIAL,
INCIDENTAL OR SPECIAL DAMAGES RESULTING FROM OR RELATED IN ANY MANNER TO ANY MYERS
PRODUCT OR PARTS THEREOF. PERSONAL INJURY AND/OR PROPERTY DAMAGE MAY RESULT FROM
IMPROPER INSTALLATION. MYERS DISCLAIMS ALL LIABILITY, INCLUDING LIABILITY UNDER THIS
WARRANTY, FOR IMPROPER INSTALLATION. MYERS RECOMMENDS INSTALLATION BY PROFESSIONALS.
Some states do not permit some or all of the above warranty limitations or the exclusion or limitation of incidental
or consequential damages and therefore such limitations may not apply to you. No warranties or representations at
any time made by any representatives of Myers shall vary or expand the provision hereof.
740 East 9th Street
Ashland, Ohio 44805-1969
419-289-1144
www.femyers.com
Warranty Rev 12/11