Pentair MYERS S25 Series 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.
S25 SERIES
SUMP PUMPS
INSTALLATION AND SERVICE MANUAL
Part # 23833A047 | © 2012 Pentair Pump Group, Inc. | 11/08/12

23833A047 11/08/12 2
WARNING: Risk of electric shock. This pump
is supplied with a grounding conductor and
grounding-type attachment plug. To reduce
the risk of electric shock, be certain that it is
connected only to a properly grounded, grounding-
type receptacle.
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 can be installed with ABS, PVC or
polyethylene plastic pipe, or galvanized or copper
pipe. Proper adapters are required to connect plastic
pipe to pump.
The discharge is threaded for 1-1/2" pipe. NOTE: DO
NOT OVERTIGHTEN DISCHARGE PIPE INTO PUMP
PLASTIC DISCHARGE FITTING.
A CHECK VALVE MUST BE USED IN THE
DISCHARGE LINE FOR ALL PUMPS. A shut-off valve
should be used. Always install check valve with arrow
on body in direction of flow.
AIR LOCKING
A sump pump is said to be air locked if water
traps air in the pump and it cannot get out, thus
preventing pump from operating.
ALL MYERS SUMP PUMPS HAVE A SMALL AIR
VENT HOLE IN THE IMPELLER CHAMBER TO
LET OUT TRAPPED AIR. IF THIS HOLE BECOMES
PLUGGED, PUMP MAY AIR LOCK. THIS USUALLY
HAPPENS ON PUMPS THAT ARE USED MAINLY IN
THE WET SEASONS. IN SUMMER MONTHS, THE
PUMP MAY BE TURNED OFF AS SUMP WATER
DRIES UP. WHEN PUMP IS TURNED ON AGAIN
AND WATER COMES UP IN THE SUMP, THE AIR
WILL TRAP IN PUMP IF NOT VENTED.
AS A SECONDARY PRECAUTION IN INSTALLATIONS
OF THIS TYPE, 1/8" HOLE SHOULD BE DRILLED IN
THE DISCHARGE PIPE BELOW THE CHECK VALVE.
THE CHECK VALVE SHOULD BE 12 TO 18" ABOVE
PUMP DISCHARGE. DO NOT PUT CHECK VALVE
DIRECTLY INTO PUMP DISCHARGE OPENING.
STARTING PUMP – (Automatic)
1. These pumps have an integral mechanical
(mercury free) ball float switch. Some models may
have a vertical actuated cylinder float.
2. Plug cord into a 115 volt GROUNDED
RECEPTACLE.
3. Run water into sump until pump starts.
4. Allow pump to operate through several on-off
cycles to be sure operation is satisfactory.
5. If shut-off valve is used in discharge line, be sure
valve is open.
6. Tether length of switch cord on ball float must be
minimum of 3-5/8".
STARTING PUMP – (Manual)
USING MFS SWITCH
1. Secure ball float to discharge pipe with minimum
3-1/2" between float and cable tie.
2. Plug MFS switch cord series plug into proper
voltage GROUNDED RECEPTACLE.
3. Plug pump cord plug into back of switch cord
series plug.
4. Run water into sump until pump starts.
5. Be sure gate valve in discharge line is open.
6. Run pump through several on-off cycles.
7. Tether length of switch cord on ball float must be
minimum of 3-5/8".
WARNING: Sump basin 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.
USING THE SUMP PUMP FOR
MANUAL OPERATION
The pump cord for these units can be plugged directly
into proper GROUNDED RECEPTACLE for continuous
pump operation.
CAUTION: THIS TYPE OF OPERATION SHOULD BE
USED ONLY FOR EMERGENCY USE OR WHERE
A LARGE VOLUME OF WATER IS TO BE PUMPED,
SUCH AS FLOODED BASEMENT.
PUMP MUST NOT BE RUN CONTINUOUSLY OUT
OF WATER.
DO NOT USE WITH EXTENSION CORD.
AUTOMATIC/MANUAL MODEL
Some sump pumps can be changed from one style,
automatic or manual, to the other by interchanging
only the plug ends of the float control with the manual
plug. The ball floats must be tethered with a cable
clamp. DO NOT REMOVE THE MOTOR CAP.

23833A047 11/08/12
3
HOW MECHANICAL SWITCH
FLOAT OPERATES
This level control uses a mechanical switch sealed in a
polypropylene float cylinder. The switch is not position
sensitive; that is, it will operate regardless of position.
When level rises in the sump, the cylinder floats up
with the level. When the cylinder position is at an
angle of about 45°, the steel ball rolls over a detent
and actuates the switch. This starts the pump motor.
As the sump level draws down, the cylinder floats
down and when it is again at an angle of about 45°,
the steel ball drops away, deactivating the switch, and
the motor stops.
BE SURE CYLINDER FLOATS FREELY IN SUMP
BASIN WITHOUT TOUCHING THE BASIN WALLS.
ADJUST PUMP POSITION IN SUMP IF NECESSARY.
Some models use a magnetically operated mercury
proximity switch. It has a float that is an integral part
of a vertical rod. These models require less space for
operation.
CLEANING FLOAT
If pump becomes inoperative because of
accumulation of trash on the float, remove from sump
and clean float.
1. Wipe all water and dirt from pump and float and
also the vertical rod on PS models.
2. Be sure float operates freely after cleaning.
CLEANING IMPELLER AND VOLUTE CASE
1. Remove (3) screws that hold bottom plate to volute
case.
2. Remove (4) screws that hold volute case to metal
motor housing.
3. Use screwdriver to pry plastic case from metal
housing. Use care not to gouge groove in the
plastic. Pry in several spots to loosen.
4. Remove volute case and clean impeller and volute
passage.
5. Be sure impeller turns freely after cleaning.
6. Clean out holes in plastic pump base and wash
thoroughly before replacing.
7. DO NOT UNSCREW IMPELLER.

23833A047 11/08/12 4
CONDITION
Pump does not run or hum.
Refer to a., b., c., d., e. or f.
Pump runs but does not deliver water.
Refer to g., h., i., j., k. or l.
Pump runs and pumps out sump but
does not stop.
Refer to m.
Pump runs but delivers only small
amount of water.
Refer to i., j., k., l. or n.
Fuse blows or circuit breaker trips
when pump starts.
Refer to k., l., n., o. or p.
Motor runs for short time then stops.
Then after short period starts again.
Indicates tripping overload caused by
symptom shown.
Refer to k., l., n. or p.
PROBABLE CAUSE
a. Line circuit breaker may be off, or fuse, if used,
may be blown or loose.
b. Water level in sump may be too low. Run in more
water. Turn-on level is 12 to 13" above sump
bottom.
c. Pump cord plug may not be making contact in
receptacle.
d. If pump is using the series cord plug, the two
plugs may not be plugged tight together.
e. Float may be stuck. Be sure float operates freely
in basin.
f. If all symptoms check OK, motor winding may
be open. Take to service center for check.
g. Check valve may be installed backward. Arrow
on valve points in direction of flow.
h. Discharge shut-off valve, if used, may be closed.
i. Pump may be air locked. Start and stop several
times by plugging and unplugging cord. Check
vent hole in pump case for plugging.
j. Pump head may be too high. Pump cannot
deliver water over 18 ft. vertical. Horizontal
distance does not affect pumping, except loss
due to friction.
k. Inlet holes in pump base may be clogged.
Remove pump and clean out openings.
l. Impeller or volute openings may be plugged or
partially plugged. Remove pump and clean per
maintenance instructions.
m. Float is stuck in up position. Be sure float
operates freely in basin.
n. Pump impeller may be partially clogged with tar
or paint, causing motor to run slow, resulting in
motor overload.
o. Fuse size or circuit breaker is too small. Must be
15 amps.
p. Defective motor stator; return to Myers service
center.
CHECK LIST IF PUMP DOES NOT OPERATE PROPERLY

23833A047 11/08/12
5
Ref.
No. Description Qty.
Part Numbers
S25A1 S25A1C S25M1C S25A1-PS S25A1C-PS S25P-1 S25PC-1 S25V1 S25V1C
1 Cord, Electric w/plug 1 21628B017 21628B044 21628B044 21628B017 21628B044 21628B017 21628B044 21628B017 21628B044
2 Cap. Motor (Not Stamped) 1 24431C000 24431C000 24431C000 24431C000 24431C000 24431C000 24431C000 24431C000 24431C000
3 Plug, 1/4" Pipe 1 05022A056 05022A056 05022A056 05022A056 05022A056 05022A056 05022A056 05022A056 O5022A056
4 Control, Level Float 1 25798A500 25798A500 – 24498B000 24498B000 – – 26292B000 26292B000
4A Control w/Series Plug – 10' Cord 1 – – – – – 21813B130 – – –
4A Control w/Series Plug – 20' Cord 1 – – – – – – 21813B131 – –
4B Bracket Switch Mtg. 1 – – – – – – – 26291B010 26291B010
5 Wire w/Terminals 1 09859A800 09859A800 09859A800 09859A800 09859A800 09859A800 09859A800 09859A800 09859A800
6 Screw, Machine, 1/4-20 x 7/8" Lg. 6 18475A003 18475A003 18475A003 – – 18475A003 18475A003 18475A003 18475A003
6Screw, Machine,
1/4-20 x 7/8" Lg. 5 – – – 18475A003 18475A003 – – – –
6A Screw, Cap, 1/4-20 x 3/4 Thrd –
2-3/8" Lg. 1 – – – 19099A016 19099A016 – – – –
6B Tube, Spacer, 1/2" 0.D. x 1-1/2" Lg. 1 – – – 25588A002 25588A002 – – – –
7 Ring, O, 5-1/2 x 5-1/4 x 1/8" 1 05876A146 05876A146 O5876A146 05876A146 O5876A146 05876A146 05876A146 O5876A146 05876A146
8Oil, Transformer
(1 Qt. in Can)
.24
Gal. 11009A002 11009A002 11009A002 11009A002 11009A002 11009A002 11009A002 11009A002 11009A002
9 Support, Motor 1 24450B000 24450B000 24450B000 24450B000 24450B000 24450B000 24450B000 24450B000 24450B000
10 Screw, Tapping, #10-24 x 1/2" Lg. 2 09822A006 09822A006 09822A006 09822A006 09822A006 09822A006 09822A006 09822A006 09822A006
10 Screw, Tapping, #10-24 x 1/2" Lg. 4 – – – – – – – 09822A006 09822A006
11 Tie, Plastic Cable 1 17190A008 17190A008 – – – 17190A008 17190A008 – –
12 Screw, Tapping, #10-24 x 1/2" Lg. 1 09822A006 09822A006 – – – 09822A006 09822A006 – –
13A* Housing, Motor (Prior to 2/1/94) 1 24446CO5O 24446CO5O 24446CO5O 24446CO5O 24446C050 24446C050 24446CO50 – –
13B* Housing, Motor (After 2/1/94) 1 24446C051 24446CO51 24446CO51 24446CO51 24446C051 24446C051 24446C051 24446CO51 24446C051
14 Motor, 1/4 H.P. 1 24447B020 24447B020 24447B020 24447B020 24447B020 24447B020 24447B020 24447B020 24447B020
– Tube, Plastic, 3/8 I.D. x 3" Lg. 1 10649A111 10649A111 10649A111 10649A111 10649A111 10649A111 10649A111 10649A111 10649A111
15A* Seal, Shaft (Prior to 2/1/94) 1 21607A000 21607A000 21607A000 21607A000 21607A000 21607A000 21607A000 – –
15B* Seal, Shaft (After 2/1/94) 1 21607A001 21607A001 21607A001 21607A001 21607A001 21607A001 21607A001 21607A001 21607A001
16 Washer, Impeller 1 05030A216 O5030A216 05030A216 05030A216 O5030A216 O5030A216 O5030A216 05030A216 05030A216
17 Impeller 1 24433B000 24433B000 24433B000 24433B000 24433B000 24433B000 24433B000 24433B000 24433B000
19 Case, Volute 1 24432C000 24432C000 24432C000 24432C000 24432C000 24432C000 24432C000 24432C000 24432C000
20 Screw, Machine, #10-24 x 3/4" Lg. 4 18475A004 18475A004 18475A004 18475A004 18475A004 18475A004 18475A004 18475A004 18475A004
21 Screw, S-T, #10-24 x 3/4" Lg. 3 05910A012 05910A012 05910A012 05910A012 O5910A012 05910A012 05910A012 O5910A012 O5910A012
22 Plate, Bottom 1 24432C003 24432C003 24432C003 24432C003 24432C003 24432C003 24432C003 24432C003 24432C003
23 Plug, Manual 1 – – 24448A000 – – 24448A000 24448A000 – –
24 Washer, Plastic 1 – – 05030A213 – – O5030A213 O5030A213 – –
25 Plug, Connector 1 – – 24449A000 – – 24449A000 24449A000 – –
*To replace shaft seal (15A) in units built prior to February 1, 1994 with (15B) 21607A001, the motor housing (13B) 24446C051 must also be used.
AUTOMATIC
S25A1 & S25A1C
AUTOMATIC
S25A1-PS & S25A1C-PS
(Proximity Switch)
VERTICAL
FLOAT
SWITCH
S25V1
S25V1C
MANUAL
S25M1C

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Warranty Rev. 12/13
STANDARD LIMITED WARRANTY
Pentair Myers® warrants its products against defects in material and workmanship for a period of 12 months from the
date of shipment from Pentair Myers or 18 months from the manufacturing date, whichever occurs first – provided
that such products are used in compliance with the requirements of the Pentair Myers catalog and technical manuals
for use in pumping raw sewage, municipal wastewater or similar, abrasive-free, noncorrosive liquids.
During the warranty period and subject to the conditions set forth, Pentair Myers, at its discretion, will repair or
replace to the original user, the parts that prove defective in materials and workmanship. Pentair 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 Pentair Myers website: http://forms.pentairliterature.com/startupform/startupform.asp?type=m.
Warranty is effective only if Pentair 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. Pentair Myers will cover only the lower
seal and labor thereof for all dual seal pumps. Under no circumstance will Pentair 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 Pentair 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 that
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 that has been repaired or altered by anyone other than Pentair Myers or an authorized
Pentair Myers service provider; (h) to any unit that has been repaired using non factory specified/OEM parts.
Warranty Exclusions: PENTAIR MYERS MAKES NO EXPRESS OR IMPLIED WARRANTIES THAT EXTEND BEYOND
THE DESCRIPTION ON THE FACE HEREOF. PENTAIR MYERS SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR ANY PARTICULAR PURPOSE.
Liability Limitation: IN NO EVENT SHALL PENTAIR MYERS BE LIABLE OR RESPONSIBLE FOR CONSEQUENTIAL,
INCIDENTAL OR SPECIAL DAMAGES RESULTING FROM OR RELATED IN ANY MANNER TO ANY PENTAIR MYERS
PRODUCT OR PARTS THEREOF. PERSONAL INJURY AND/OR PROPERTY DAMAGE MAY RESULT FROM IMPROPER
INSTALLATION. PENTAIR MYERS DISCLAIMS ALL LIABILITY, INCLUDING LIABILITY UNDER THIS WARRANTY, FOR
IMPROPER INSTALLATION. PENTAIR 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 Pentair Myers shall vary or expand the provision hereof.
1101 MYERS PARKWAY 490 PINEBUSH ROAD, UNIT 4
ASHLAND, OHIO 44805 CAMBRIDGE, ONTARIO, CANADA N1T 0A5
PH: 855-274-8947 PH: 800-363-7867
WWW.FEMYERS.COM WWW.FEMYERS.COM