Xylem Goulds Marlow Series User manual
Marlow Series Cast Iron
Swimming Pool Pumps
3B28EC – 3B32EC
INSTRUCTION MANUAL
SECTION 360A
AC1683
REVISION D
INSTALLER:
PLEASE LEAVE THIS MANUAL FOR THE OWNER'S USE.
PLEASE FILL IN DATA FROM YOUR
PUMP NAMEPLATE
Pump Model: _______________________________________
Spec. No. ___________________________________________
Serial No. ___________________________________________
Seal No. ____________________________________________
SAFETY INSTRUCTIONS
This safety alert symbol will be used in this manual and on the
pump instructions decal to draw attention to safety related
instructions. When used, the safety alert symbol means
ATTENTION! BECOME ALERT! YOUR SAFETY IS INVOLVED!
FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN
A SAFETY HAZARD.
2
WARRANTY
WARRANTY –Company warrants title to the product(s) and, except as noted
with respect to items not of Company’s manufacturer, also warrants the
product(s) on date of shipment to Purchaser, to be of the kind and quality
described herein, and free of defects in workmanship and material.
THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES,
INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANT-
ABILITY AND FITNESS, AND CONSTITUTES THE ONLY WARRANTY OF
COMPANY WITH RESPECT TO THE PRODUCT(S).
If within one year from date of initial operation, but not more than eighteen
months from date of shipment by Company of any item of product(s),
Purchaser discovers that such item was not as warranted above and promptly
notifies Company in writing thereof, Company shall remedy such nonconfor-
mance by, at Company’s option, adjustment or repair or replacement of the
item and any affected part of the product(s). Purchaser shall assume all
responsibility and expense for removal, reinstallation, and freight in connection
with the foregoing remedies. The same obligations and conditions shall
extend to replacements parts furnished by Company hereunder. Company
shall have the right of disposal of parts replaced by it.
ANY SEPARATELY LISTED ITEM OF THE PRODUCT(S) WHICH IS NOT
MANUFACTURED BY THE COMPANY IS NOT WARRANTED BY COMPANY
and shall be covered only by the express warranty, if any, of the manufacturer
thereof.
THIS STATES PURCHASER’S EXCLUSIVE REMEDY AGAINST COMPANY
AND ITS SUPPLIERS RELATING TO THE PRODUCT(S), WHETHER IN
CONTRACT OR IN TORT OR UNDER ANY OTHER LEGAL THEORY, AND
WHETHER ARISING OUT OF WARRANTIES, REPRESENTATIONS, INSTRUC-
TIONS, INSTALLATIONS OR DEFECTS FROM ANY CAUSE. Company and its
suppliers shall have no obligation as to any product which has been
improperly stored or handled, or which has not been operated or maintained
according to instructions in Company or supplier furnished manuals.
4
tagged
motor shell, etc.
6. Do not operate this unit without terminal cover in place.
routine basis. Consult GFCI manufacturer’
3
RECOMMENDED PRECAUTIONS
1. All electrical wiring of the motor installation, repair and
service must be done by a licensed electrician in
accordance with applicable electrical codes.
2. No modifications, additions or deletions should be made
to the pump, without prior approval of the factory.
3. Pump designed for swimming pool service only. Consult
factory for any other applications.
4. Motors driving the pumps may operate at high
temperatures and to avoid burns –keep hands off the
motor shell, etc.
5. After servicing a pump, always re-install the safety
devices as originally found prior to disassembly.
6. Local electrical codes may require use of a Ground Fault
Circuit Interrupter (GFCI) on circuits supplying power to
pool equipment. Marlow recommends the use of a GFCI
on all installations.
OPERATING INSTRUCTIONS
GENERAL
This pump was designed for the purpose of being used as a
circulation pump for swimming pools. For other applications,
consult the manufacturer.
Our shipping container has been specifically designed to
prevent transit damage. Any damage should be carefully
noted on the delivery ticket and a claim filed promptly with
the carrier.
LOCATION
Locate the pump as close as possible to the pool (never
more than 8 feet above pool water level). Install on a rigid
foundation, preferably 2" or more above ground level. Pro-
vide the necessary space around the pump for future
inspection and servicing of the unit. We recommend a
louvered housing to protect exposed motors from the sun
and rain. Allow for ventilation. Housing should clear the
motors by a minimum of 10" at all points.
INSTALLATION
1. Suction line should be as large as the suction port of the
pump. All piping must be air tight. If possible keep all
suction lines below pool water level until just before the
pump. Suction lines should slope toward the pump.
The threads of pipe fittings screwed into the pump body
must be sealed with acceptable pipe thread compound.
2.It is recommended that pipe unions be installed on the
suction and discharge pipes close to the pump. Thus, the
pump-motor assembly may be removed with ease for
service and storage.
3. Tighten the pump fittings only as much as it is required to
insure a tight connection (two turns past hand tight is
sufficient). Excessive torque (more than 30-foot pounds) is
unnecessary and may damage the pump.
4.The weight of the piping should be supported indepen-
dently and not carried by the pump.
ROTATION
The pump is specifically designed to rotate in a counter
clockwise direction when viewing the motor from the pump
suction. Three-phase motors can rotate in either direction.
Momentarily, start or “bump”the motor to check the rotation
of the pump shaft. Interchanging any two leads of a three-
phase motor will reverse the rotation.
PRIMING
Fill the pump tank with water before starting. This may be
done through the strainer cover. This is necessary to allow
pump to prime and to prevent permanent damage. Except in
freezing weather always keep liquid in the pump tank. No
further lubrication of the pump end is necessary including
the seal assembly. If flow does not start within five minutes,
stop motor and determine cause (see Trouble Guide on page
7). Be sure all suction and discharge valves are open when
the pump is running. Operating the pump with a closed valve
in the system can cause pump damage.
MAINTENANCE
The strainer built into the pump should be inspected and
cleaned daily. These strainers are easy to clean. Loosen the
hand knob(s) and remove the strainer cover to expose the
strainer basket. Remove the basket and clean. Inspect the
cover gasket; if damaged, replace. Install the strainer cover,
CAUTION: READ CAREFULLY
The performance of Marlow pumps is based upon
clear, cold, fresh water with suction conditions as shown
on the performance curve. If used to pump other liquids,
pump performance may differ from rated performance
based on the different specific gravity, temperature,
viscosity, etc. of the liquid being pumped. A standard
pump may not be safe for pumping all types of liquids,
such as toxic, volatile or chemical liquids, or liquids under
extreme temperatures or pressures. Please consult
Marlow catalogs as well as local codes and general
references to determine the appropriate pumps for your
particular application. Since it is impossible for us to
anticipate every application of a Marlow pump, if you
plan to use the pump for a non-water application, consult
Marlow beforehand to determine whether such application
may be proper or safe under the circumstances. Failure to
do so could result in property damage or personal injury.
CONGRATULATIONS
You are now the owner of a Marlow pump. This pump was carefully inspected and subjected to
final performance tests before releasing for shipment. In order to achieve maximum performance,
please follow the simple instructions in this manual.
SAFETY INSTRUCTIONS
SA
V
E THESE INSTRUCTIONS:
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WARNING: This product can expose you to
chemicals including Lead, which is known to the
State of California to cause cancer and birth defects
or other reproductive harm. For more information go
to: www.P65Warnings.ca.gov.
INSTRUCTIONS FOR
LICENSED ELECTRICIANS
The wire used to supply power to the motor must be large
enough to carry the necessary amperes for the required
length without excessive voltage drop.
5
Key Description
*1 Hand Knob
ä2Cover
* 3 Gasket, Cover
* 4 Strainer Basket
5 Strainer Body
6 Drain Plug
* 7 Gasket, Body
8 Tank
11 Filler Plug
12 Tank Strainer Comb.
13 Cap Screw
* 14 Gasket, Diffuser
ä15 Diffuser
* 16 Impeller Bolt
* 17 Impeller Lockwasher
* 18 Impeller Washer
ä19 Impeller, Closed
ä20 Impeller, Open
* 21 Impeller Shim, F/C.I. Impellers
* 22 Seal Assembly
* 23 Gasket, Tank
24 Lantern
WARNING
All electric work must be done by a licensed
electrician. Before working on motors be certain that the
electrical power is off at the main junction box.
Disconnect the fuse or the circuit breaker and tag the
main switch: “Do not energize this switch. Personnel
working on equipment.”Failure to follow these instruc-
tions may result in personal injury, death or property
damage.
PUMP PARTS LIST
See Page 6 For Exploded View Illustration
* Recommended Spare Parts.
äRecommended Distributor Stock, Export Spares and Critical Service.
Key Description
25 Cap Screw
* 26 Slinger
* 27 Shim
28 Motor
29 Hex Nut
30 Foot
31 Lantern-Motor Comb.
32 Yoke
33 Stud
* 34 Impeller Key
* 35 Shaft Sleeve
36 Suction Inlet
37 Carriage Bolt
38 Gasket, Bolt
39 Lower Weight
40 Valve Facing
41 Upper Weight
42 Stop Plate
43 Lockwasher
44 Hex Nut
* 45 Check Valve Assembly
Be sure the motor is properly wired to match the voltage and
phase of the power supply line. On three-phase motors be
certain the motor is rotating in the proper direction.
3
4
36 37 38 39 40 41 42 43 44
45
11
6
12
14
8
7
14 15
33
5
6
6
16 17 18 34
19
23
21 22
24
27 26 35
30 29
23
25
24 26
31 13 26
27
28
11
8
32
1
2
20
19
15 16 17 18
21 22
6
6
EXPLODED VIEW DRAWING
IMPORTANT: How to USE this DRAWING to ORDER PARTS
The grouping of parts illustrations cover different Marlow models, including
your own pump. The table on page 5 indicates the name of each part. Should
you need a replacement, refer to above drawings – locate the part that
matches your pump parts. Contact your local Marlow dealer and supply him
with the Key Number and Description of the parts required, along with your
pump Model number, Spec. number and Serial number, which are located on
the pump nameplates.
5
* 45 Check Valve Assembly
Marlow
© COPYRIGHT 1998 BY ITT INDUSTRIES, INC.
PRINTED IN U.S.A. 12-98
Marlow
445 Godwin Ave.
Midland Park, NJ 07432
(201) 447-7401
Fax: (201) 444-7545
7
SYMPTOMS PROBABLE CAUSE RECOMMENDED ACTION
1. Pump will not prime 1. Suction air leak. Make sure strainer gasket is clean and
properly positioned.
Tighten strainer cover down snugly.
Tighten all pipes and fittings on suction of
pump.
Remove and replace pump seal.
Be sure water in pool is high enough to flow
through skimmer.
2. No water in pump. Make sure pump tank is full of water.
3. Closed valves or blocked lines. Open all valves in system.
Clean skimmer and pump strainer.
Open pump and check for clogging.
2. Motor does not turn. 1. No power to motor. Check that all power switches are on.
Be sure fuse or circuit breaker is properly set.
Time properly set?
Check motor wiring at terminals.
2. Pump jammed. With power off turn shaft –it should spin
freely. If not disassemble and repair.
3. Low flow. 1. Dirty filter. Back wash filter when filter pressure is “high.”
2. Dirty skimmer basket. Clean skimmer and pump strainer basket.
3. Suction air leak. (See Problem 1)
4. Closed valves or blocked lines. (See Problem 1)
5. Reverse rotation. Can happen only with 3 phase motors,
change any two power leads.
4. Motor runs hot. These motors will run “hot”to
the touch. However, this is normal,
they are designed that way. Thermal
overload protector will function to turn
them off if there is an overload or high
temperature problem. Excessive heat
can be caused by:
1. Low voltage or incorrect voltage. Wiring to be corrected by licensed electrician.
2. Installed in direct sun. Shield motor from sun’s rays.
3. Poor ventilation. Do not tightly cover or enclose motor.
5. Noisy operation of motor. 1. Bad Bearings. Have electrician replace bearings in motor.
6. Noisy operation of pump. 1. Air leak in suction line. Bubbles in water Repair leak. Check suction pipe, strainer
returning to pool at inlet. cover in place? Cover gasket clean?
2. Restricted suction line due to blockage Remove blockage or increase suction pipe
or under-size pipe. Indicated by high size. Make sure strainer basket is clean.
vacuum reading at pump suction. Are all suction valves fully open?
3. Foreign matter (gravel, metal, etc.) in Disassemble pump and remove foreign
pump impeller? matter from impeller.
4. Cavitation. Improve suction conditions. (Reduce suction
lift, reduce number of fittings, increase pipe
size.) Increase discharge pressure and reduce
flow by throttling discharge valve.
7. Motor overload protection “Kicks Out”. 1. Motor is improperly connected. Check wiring diagram on motor.
2. Low voltage due to undersized wire or Check with volt meter. Increase size of supply
low incoming voltage. wire. Report low supply voltage to power
company. Voltage at motor must be within
10% of motor nameplate voltage.
3. Wrong size heaters in protective device. Heaters should be one size larger than full
load amps shown on motor nameplate.
4. Overload due to binding in pump or Indicated by high amperage readings on
wrong size impeller. motor, binding shaft. Disassemble unit
and correct.
TROUBLESHOOTING GUIDE
NOTE: Never work on pump without making certain power is off.
WARNING
Electrical Work Must Be Done
By A Licensed Electrician.
Xylem, Inc.
8200 N. Austin Avenue
Morton Grove, Illinois 60053
Phone: (847) 966-3700
Fax: (847) 965-8379
www.xylem.com/goulds
Goulds is a registered trademark of Goulds Pumps, Inc. and is used under license.
© 2019Xylem Inc. AC1683 REV DAugust 2019
1) The tissue in plants that brings water upward from the roots;
2) a leading global water technology company.
We’re a global team unied in a common purpose: creating innovative solutions to
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For more information on how Xylem can help you, go to www.xylem.com
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