Gorman-Rupp Pumps S8B1-E100 User Manual
ACU
OM‐06259‐01
March 31, 2009
Rev. A 05‐15‐12
INSTALLATION, OPERATION,
AND MAINTENANCE MANUAL
WITH PARTS LIST
SUBMERSIBLE PUMPS
MODELS
S8B1-E100 460/3
and
S8B1-E100 575/3
THE GORMAN‐RUPP COMPANY MANSFIELD, OHIO
www.grpumps.com
GORMAN‐RUPP OF CANADA LIMITED ST. THOMAS, ONTARIO, CANADA Printed in U.S.A.
2009 The Gorman‐Rupp Company
Register your new
Gorman‐Rupp pump online at
www.grpumps.com
Valid serial number and e‐mail address required.
RECORD YOUR PUMP MODEL AND SERIAL NUMBER
Please record your pump model and serial number in the
spaces provided below. Your Gorman‐Rupp distributor
needs this information when you require parts or service.
Pump Model:
Serial Number:
TABLE OF CONTENTS
INTRODUCTION PAGE I - 1.................................................
SAFETY ‐ SECTION A PAGE A - 1............................................
INSTALLATION - SECTION B PAGE B - 1....................................
GENERAL INFORMATION PAGE B - 1..................................................
PUMP SEAL PAGE B - 1..............................................................
LUBRICATION PAGE B - 1.............................................................
PUMP INSTALLATION PAGE B - 1......................................................
Pump Motor Specifications PAGE B - 2..............................................
Pump Dimensions PAGE B - 2.....................................................
Lifting PAGE B - 2.................................................................
Positioning the Pump PAGE B - 3...................................................
Piping PAGE B - 3................................................................
ELECTRICAL CONNECTIONS PAGE B - 4...............................................
Field Wiring Connections (Incoming Power) PAGE B - 4...............................
Grounding Methods PAGE B - 5....................................................
Pump Power Cable Connections PAGE B - 6.........................................
Control Box Specifications PAGE B - 7..............................................
Motor Cable Grounding Test PAGE B - 7.............................................
Control Box Connections PAGE B - 7...............................................
Liquid Level Devices PAGE B - 7....................................................
WIRING DIAGRAMS PAGE B - 8.......................................................
OPERATION - SECTION C PAGE C - 1......................................
GENERAL INFORMATION PAGE C - 1..................................................
Pump Performance PAGE C - 1.....................................................
Control Box PAGE C - 1...........................................................
PUMP OPERATION PAGE C - 1........................................................
Liquid Temperature And Overheating PAGE C - 1.....................................
Impeller Rotation PAGE C - 2.......................................................
STARTING, STOPPING AND OPERATIONAL CHECKS PAGE C - 3.........................
Starting PAGE C - 3...............................................................
Stopping PAGE C - 3..............................................................
Operational Checks PAGE C - 3....................................................
COLD WEATHER PRESERVATION PAGE C - 4...........................................
LUBRICATION PAGE C - 4.............................................................
Draining Oil PAGE C - 5...........................................................
Condition of Oil Oil PAGE C - 5.....................................................
Adding Oil PAGE C - 5............................................................
TROUBLESHOOTING - SECTION D PAGE D - 1..............................
PREVENTIVE MAINTENANCE PAGE D - 3...............................................
PUMP MAINTENANCE AND REPAIR ‐ SECTION E PAGE E - 1.................
STANDARD PERFORMANCE CURVE PAGE E - 1........................................
i
TABLE OF CONTENTS
(continued)
PARTS LISTS:
Pump Assemblies PAGE E - 3......................................................
Terminal Housing and Cable Assemblies PAGE E - 5..................................
PUMP AND SEAL DISASSEMBLY AND REASSEMBLY PAGE E - 6.........................
PUMP END DISASSEMBLY PAGE E - 7.................................................
Strainer Removal PAGE E - 7.......................................................
Draining Oil From Seal Cavity PAGE E - 7............................................
Draining Oil From Motor Cavity PAGE E - 7..........................................
Positioning Pump For Disassembly PAGE E - 7.......................................
Strainer Plate and Suction Head Removal PAGE E - 7.................................
Impeller Removal PAGE E - 7......................................................
Lower Seal Removal PAGE E - 8....................................................
Upper Seal Removal PAGE E - 8...................................................
PUMP END REASSEMBLY PAGE E - 8..................................................
Cleaning and Inspection of Pump Parts PAGE E - 8...................................
Upper Seal Installation PAGE E - 9..................................................
Lower Seal Installation PAGE E - 10..................................................
Impeller Installation PAGE E - 11.....................................................
Suction Head and Strainer Plate Installation PAGE E - 11...............................
Strainer Screen and Base Plate Installation PAGE E - 12................................
MOTOR DISASSEMBLY PAGE E - 12....................................................
Terminal Housing and Power Cable Removal and Disassembly PAGE E - 12..............
Intermediate and Motor Housing Disassembly PAGE E - 13.............................
Rotor and Bearing Removal PAGE E - 13.............................................
Stator Removal PAGE E - 14........................................................
Relief Valve PAGE E - 14............................................................
Hoisting Bail PAGE E - 15...........................................................
MOTOR REASSEMBLY PAGE E - 15.....................................................
Stator Installation PAGE E - 15......................................................
Bearing Installation PAGE E - 16.....................................................
Rotor and Intermediate Reassembly PAGE E - 17......................................
Terminal Housing and Power Cable Reassembly and Installation PAGE E - 17.............
Sealing Terminal Housing Connections With Silicone Adhesive PAGE E - 18..............
Sealing Terminal Housing Connections With Potting Compound PAGE E - 19.............
Terminal Housing Installation PAGE E - 20............................................
FINAL ASSEMBLY PAGE E - 20.........................................................
VACUUM TESTING PAGE E - 21........................................................
LUBRICATION PAGE E - 22.............................................................
Seal Cavity PAGE E - 22............................................................
Motor Housing Cavity PAGE E - 22...................................................
ii
INTRODUCTION
OM-06259S SERIES PUMPS
Thank You for purchasing a Gorman‐Rupp S Se
ries Pump. Read this manual carefully to learn
how to safely install and operate your pump. Fail
ure to do so could result in personal injury or dam
age to the pump.
Because pump installations are seldom identical,
this manual cannot possibly provide detailed in
structions and precautions for every aspect of
each specific application. Therefore, it is the re
sponsibility of the owner/installer of the pump to
ensure that applications not addressed in this
manual are performed only after establishing that
neither operator safety nor pump integrity are com
promised by the installation. Pumps and related
equipment must be installed and operated ac
cording to all national, local and industry stan
dards.
The pump motor must be operated through the
control box furnished with the pump as standard
equipment. For control box information, consult
the separate control box manual accompanying
the unit.
Pump construction is aluminum, with ductile iron
wearing parts. The pump may be operated fully or
partially submerged. Neither the pump nor the
control box are explosion‐proof, and should not be
operated in a hazardous atmosphere.
RECORDING MODEL AND
SERIAL NUMBER
Please record the pump model and serial number
in the spaces provided on the inside front cover of
this manual. Your Gorman‐Rupp distributor needs
this information when you require parts or service.
WARRANTY INFORMATION
The warranty provided with your pump is part of
Gorman‐Rupp's support program for customers
who operate and maintain their equipment as de
scribed in this and the other accompanying litera
ture. Please note that should the equipment be
abused or modified to change its performance be
yond the original factory specifications, the war
ranty will become void and any claim will be de
nied.
The following are used to alert personnel to proce
dures which require special attention, to those
which could damage equipment, and to those
which could be dangerous to personnel:
If there are any questions regarding the pump
which are not covered in this manual or in other lit
erature accompanying the unit, please contact
your Gorman‐Rupp distributor or the Gorman‐
Rupp Company:
The Gorman‐Rupp Company
P.O. Box 1217
Mansfield, Ohio 44901-1217
Phone: (419) 755-1011
or:
Gorman‐Rupp of Canada Limited
70 Burwell Road
St. Thomas, Ontario N5P 3R7
Phone: (519) 631-2870
Immediate hazards which WILL result in
severe personal injury or death. These
instructions describe the procedure re
quired and the injury which will result
from failure to follow the procedure.
Hazards or unsafe practices which
COULD result in severe personal injury
or death. These instructions describe
the procedure required and the injury
which could result from failure to follow
the procedure.
PAGE I - 1INTRODUCTION
OM-06259
S SERIES PUMPS
damage which could result from failure to
follow the procedure.
Hazards or unsafe practices which COULD
result in minor personal injury or product or
property damage. These instructions de
scribe the requirements and the possible
NOTE
Instructions to aid in installation, operation, and
maintenance or which clarify a procedure.
PAGE I - 2 INTRODUCTION
OM-06259 S SERIES PUMPS
SAFETY - SECTION A
This information applies to the S Series
submersible motor driven pumps indi
cated on the front cover of this manual.
Before connecting any cable to the con
Because pump installations are seldom
identical, this manual cannot possibly
provide detailed instructions and pre
cautions for each specific application.
Therefore, it is the owner/installer's re
sponsibility to ensure that applications
not addressed in this manual are per
formed only after establishing that nei
ther operator safety nor pump integrity
are compromised by the installation.
trol box, be sure to ground the control
box. Refer to the Control Box Manual for
the suggested grounding methods.
The pump motor is designed to be oper
ated through the control box furnished
with the pump. The control box provides
overload protection and power control.
Do not connect the pump motor directly
to the incoming power lines.
Before attempting to open or service the
pump:
1. Familiarize yourself with this man
ual.
2. Lock out incoming power to the
control box to ensure that the
pump will remain inoperative.
3. Allow the pump to completely cool
if overheated.
4. Close the discharge valve (if
used).
This pump is not designed to pump vol
atile, explosive, or flammable materials.
Do not attempt to pump any liquids for
which you pump is not approved, or
which may damage the pump or endan
ger personnel as a result of pump fail
ure. Consult the factory for specific ap
plication data.
The electrical power used to operate
this pump is high enough to cause inju
ry or death. Obtain the services of a
qualified electrician to make all electri
cal connections. Make certain that the
pump and enclosure are properly
grounded; never use gas pipe as an
electrical ground. Be sure that the in
coming power matches the voltage and
phase of the pump and control before
connecting the power source. Do not
run the pump if the voltage is not within
the limits. If the overload unit is tripped
during pump operation, correct the
problem before restarting the pump.
The electrical power used to operate
this pump is high enough to cause inju
ry or death. Make certain that the control
handle on the control box is in the OFF
PAGE A - 1SAFETY
S SERIES PUMPS OM-06259
position and locked out, or that the pow
er supply to the control box has been
otherwise cut off and locked out, before
attempting to open or service the pump
assembly. Tag electrical circuits to pre
vent accidental start‐up.
Never attempt to alter the length or re
pair any power cable with a splice. The
pump motor and cable must be com
pletely waterproof. Injury or death may
result from alterations.
All electrical connections must be in ac
cordance with The National Electric
Code and all local codes. If there is a
conflict between the instructions pro
vided and N.E.C. Specifications, N.E.C.
Specifications shall take precedence.
All electrical equipment supplied with
this pump was in conformance with
N.E.C. requirements in effect on the
date of manufacture. Failure to follow
applicable specifications, or substitu
tion of electrical parts not supplied or
approved by the manufacturer, can re
sult in severe injury or death and void
warranty.
After the pump has been installed, make
certain that the pump and all piping or
hose connections are secure before op
eration.
trician to troubleshoot, test and/or ser
vice the electrical components of this
pump.
Approach the pump cautiously after it
has been running. Although the motor is
cooled by the liquid being pumped, nor
mal operating temperatures can be high
enough to cause burns. The tempera
ture will be especially high if operated
against a closed discharge valve. Never
operate against a closed discharge
valve for long periods of time.
Do not remove plates, covers, gauges,
pipe plugs, or fittings from an over
heated pump. Vapor pressure within the
pump can cause parts being disen
gaged to be ejected with great force. Al
low the pump to completely cool before
servicing.
Do not attempt to lift the pump by the
motor power cable or the piping. Attach
proper lifting equipment to the lifting
device fitted to the pump. If chains or
cable are wrapped around the pump to
lift it, make certain that they are posi
tioned so as not to damage the pump,
and so that the load will be balanced.
Pumps and related equipment must be
installed and operated according to all na
Obtain the services of a qualified elec
PAGE A-2 SAFETY
tional, local and industry standards.
S SERIES PUMPS
OM-06259
INSTALLATION - SECTION B
GENERAL INFORMATION
Review all SAFETY information in Section A.
Since pump installations are seldom identical, this
section is intended only to summarize general rec
ommendations and practices required to inspect,
position, and arrange the pump and piping. If there
are any questions concerning your specific instal
lation, contact your Gorman‐Rupp distributor or
the Gorman‐Rupp Company.
Liquid level devices are available from Gorman‐
Rupp as optional equipment. For information on
installing and operating these items, refer to the lit
erature accompanying them.
Pump Model Designation
Following is a description of the model numbering
system for S Series pumps. These submersible
pumps are available in a range of sizes. Refer to the
following chart to identify the size of your specific
pump model.
ratings on the control box and incoming pow
er.
e. Carefully read all tags, decals, and markings
on the pump, and perform all duties indicated.
f. Check for oil leaks. If there is any indication of
an oil leak, see LUBRICATION at the end of
this manual.
PUMP SEAL
There are two shaft seals in the pump. The lower
seal prevents liquid from entering the intermediate
cavity at the impeller end. The upper seal prevents
oil leakage from the motor housing cavity and acts
as back‐up protection in the event of lower seal fail
ure.
LUBRICATION
These pumps utilize two lubrication cavities. The
motor housing cavity provides lubrication to the
motor assembly and bearings, while the intermedi
ate cavity provides lubrication to the pump seal.
Pump Model
S
Series
3 C 1 E 230/3- 6.2
Pump Construction
Discharge Size
Pump Hydraulics
Voltage/Phase
H.P.
PREINSTALLATION INSPECTION
The pump assembly was inspected and tested be
fore shipment from the factory. Before installation,
check for damage which may have occurred dur
ing shipment. Check as follows:
a. Inspect the pump assembly for cracks, dents,
damaged threads, and other obvious dam
age.
b. Check for loose attaching hardware. Since
gaskets tend to shrink after drying, check for
loose hardware at the mating surfaces.
c. Inspect the power cable for cuts or any other
obvious damage.
d. Check that amperes, phase, voltage and
hertz indicated on the name plate match the
The pumps are fully lubricated when shipped from
the factory. However, lubrication levels must be
checked before installing the pump (see LU
BRICATION in MAINTENANCE AND REPAIR SECTION E). An additional quart (0,9 liter) of oil is
provided to “top off” the oil level in the pump motor
cavity. If the oil level is abnormally low, determine
the cause before putting the pump into service.
Due to differences in pump design, the quantity of
oil and manner in which oil is to be added to the
seal cavity varies between pump models. Refer to
Table B‐2 for oil capacities and positions for filling
the seal cavity in each pump. Motor cavities requir
ing lubrication should always be positioned verti
cally for filling. Refer to LUBRICATION, Section C
for lubrication specifications and intervals.
PUMP INSTALLATION
When installing or servicing the pump
or controls, follow all requirements for
the installation of wiring or electrical
PAGE B - 1INSTALLATION
OM-06259 S SERIES PUMPS
equipment as outlined in the National
Electric Code. Follow all safety require
ments. Failure to observe these require
ments could result in injury or death to
personnel.
Do not allow the free end of the power
cable to enter the liquid being pumped.
The free end of the cable must be kept dry
Table B‐1. Pump Specifications
Model Voltage/
Phase
460/3
S8B
575/3
Dual
Voltage
NO 8 INCH100 HP 1750
Pump
HP/
KW
Motor
Speed
(RPM)
to prevent liquid from wicking through the
cable and into the motor.
NOTE
Refer to the performance curve in Maintenance
and Repair - Section E when determining the
most efficient piping installation. The recom
mended maximum submergence depth is 65
feet.
Pump Motor Specifications
See Table B‐1 for pump specifications.
Full
Load
Amperes
135
108
No
Load
Amperes
40.3
30.9
Locked
Rotor
Amperes
715
556
Discharge
Size
(NPT)
Table B‐2. Additional Specifications
Approximate
Weight - Lbs. (kg)
Pump
Model
S8B
Pump Dimensions
For the approximate physical dimensions of your
pump, refer to the pump specification data sheet
or contact your Gorman‐Rupp distributor or the
Gorman‐Rupp Company.
Lifting
Pump unit weights will vary depending on the
mounting and drive provided. Check the shipping
tag on the unit packaging for the actual weight, and
use lifting equipment with appropriate capacity.
Drain the pump and remove all customer‐installed
equipment such as suction and discharge hoses
or piping before attempting to lift existing, installed
units.
Voltage/
Phase
460/3
575/3
Pump
870 (395) 105 (48) 224 (6,6) 768 (22,7) V
50 Ft. Cable
Oil Capacity
Ounces (Liters)
Seal
Cavity
Refer to Table B-2 for the approximate maximum
weight for your pump.
Motor
Cavity
Seal Cavity
Filling
Position
(H)orizontal
(V)ertical
Do not attempt to lift the pump by the
motor power cable or the piping. Attach
proper lifting equipment to the lifting
device fitted to the pump. If chains or
cable are wrapped around the pump to
lift it, make certain that they are posi
tioned so as not to damage the pump,
and so that the load will be balanced.
PAGE B - 2 INSTALLATION
S SERIES PUMPS
OM-06259
Positioning the Pump
NOTE
Before installing and operating the pump, check
the direction of impeller rotation to ensure that the
pump is properly wired at the control box. See IM
PELLER ROTATION, Section C.
The pump is designed to operate fully or partially
submerged. The rotating parts are oil lubricated,
and the motor is cooled by a constant flow of liquid
or air discharged through internal passages.
As a safeguard against rupture or explosion due to
heat, models equipped with oil‐lubricated motors
are fitted with a pressure relief valve which will open
if vapor pressure within the pump motor reaches a
critical point.
The pump will operate if positioned on its side, but
this is not recommended because the motor
torque could cause the pump to roll during opera
tion.
The pump should be independently secured and
supported by the lifting device fitted on the pump.
If the application involves a lot of debris, protect the
pump from excessive wear and clogging by sus
pending it in a perforated barrel or culvert pipe. If
the bottom is heavily sludge‐covered, rest the
pump on support blocks or suspend it from a raft
or similar device near the surface of the liquid. See
Figure B-1 for typical pump installations.
All liquid entering the pump must pass through a
strainer screen. Any spherical solids which pass
through the screen will pass through the pump.
BY BAIL IN PERFORATED CULVERT PIPE ON SUPPORTS
Figure B-1 Typical Pump Installations
Piping
No suction piping is required in a standard installa
tion.
These pumps are provided with a suction strainer
to prevent large solids from clogging the impeller.
If required, the strainer can be removed and the
pump suction “staged” to the discharge of another
pump, allowing one pump to feed the other on high
discharge head applications.
To determine the size of the discharge connection,
see Table B-1, Pump Specifications. Either
hose or rigid pipe may be used. To facilitate mobil
ity and maintenance, it is recommended that the
discharge line be fitted with a quick disconnect fit
PAGE B - 3INSTALLATION
OM-06259 S SERIES PUMPS
ting near the pump. The discharge line must be in
dependently supported to avoid strain and vibra
tion on the pump.
Either hose or rigid pipe may be used to make dis
charge connections. For maximum pumping ca
pacity, keep the line as short and straight as pos
sible. Elbows and fittings used in discharge lines
increase friction loss, minimize their use.
It is recommended that a check valve or throttling
valve be installed in the discharge line to control si
phoning or back flow when the pump is shut off.
ELECTRICAL CONNECTIONS
Install and operate this pump in accor
dance with the National Electrical Code
and all local codes. Have a qualified
electrician perform all checks and con
nections in this section.
Never attempt to alter the length of the
pump motor cable or to repair it with a
splice. The power cable and pump mo
tor must be kept completely waterproof.
Serious damage to the pump and injury
or death to personnel can result from
any alteration to the cable.
Control Box Installation
sible to the operator, and located close enough to
the pump to avoid excessive voltage drop due to
cable length (see Pump Power Cable Connec
tion). After the box is installed, make certain the
front cover latches properly.
Failure to mount the control box vertically
on a level surface may affect operation of
the pump controls.
Field Wiring Connections (Incoming Power)
The electrical power used to operate
this pump is high enough to cause inju
ry or death. Obtain the services of a
qualified electrician to make all electri
cal connections. Make certain that the
pump and enclosure are properly
grounded; never use gas pipe as an
electrical ground. Be sure that the in
coming power matches the voltage and
phase of the pump and control before
connecting the power source. Do not
run the pump if the voltage is not within
the limits.
Do not connect the pump motor directly
The pump is designed to be operated
through the control box furnished with
the pump. The control box provides
overload protection and power control.
Do not connect the pump motor directly
to the incoming power lines.
The control box is a rainproof enclosure with a pad
lockable front cover. The enclosure is not de
signed to be watertight, and should not be sub
merged. Refer to the control box manual for enclo
sure dimensions and parts.
Secure the control vertically on a level surface,
above flood level. The box should be easily acces
PAGE B - 4 INSTALLATION
to the incoming power lines. The pump
motor is designed to operate through a
Gorman‐Rupp approved control box
which provides overload protection and
power control; otherwise, the pump
warranty will be voided. Make certain
that the pump and control box are prop
erly grounded. Install and operate the
control box in accordance with the Na
tional Electric Code and all local codes.
Failure to follow these could result in in
jury or death to personnel.
Field wiring is not provided with the pump, and
must be supplied by the user. The field wiring must
S SERIES PUMPS
OM-06259
be of the proper size and type to ensure an ade
quate voltage supply to the pump. Voltage avail
able at the motor must be within the range indi
cated in Table B‐3.
To calculate the voltage available at the motor, pro
ceed as follows:
a. Measure the voltage across the incoming
lines (1 & 2 for single phase, 1 & 2, 2 & 3, and 1
& 3 for three phase) while the pump is oper
ating at full capacity. Refer to the literature
supplied with the control box for power supply
connections.
b. Next, subtract the motor cable voltage drop
(see Table 4, Pump Power Cable Specifica
tions).
c. Do not continue to operate the pump if this
voltage is not within the recommended limits.
Obtain the services of a qualified electrician to
determine the correct field wiring size and oth
er details to ensure an adequate voltage sup
ply to the pump.
Table B‐3. Pump Voltage Requirements
NOMINAL
VOLTAGE
575 3 520 630
Make certain all connections are tight and that
cable entry points are rainproof. Support the cable
weight, if required, to prevent excessive strain on
cable clamps and cable.
Grounding Methods
Electrically ground the installation before connect
ing the field wiring to the control box. Install a
grounding terminal to the enclosure and connect
it to a properly embedded electrode.
The material used for the electrode must be an ex
cellent conductor of electricity, such as copper. If
iron or steel is used, it must be galvanized or other
wise metal plated to resist corrosion. Do not coat
the electrode with any material of poor conductiv
ity, such as paint or plastic.
The electrode must conform to the recommenda
tions of N.E.C. ARTICLE 250. Follow all installation
requirements of the N.E.C., and all applicable
codes. See Figure B-3 for some suggested
grounding methods.
PHASE
3460 420 500
MINIMUM
VOLTAGE
MAXIMUM
VOLTAGE
a) PLATE ELECTRODE b) DRIVEN ELECTRODE c) BURIED ELECTRODE
SOIL
1/4 INCH (6,4 MM)
STEEL PLATE 2 SQ.
FEET (1858,1 SQ. CM)
SURFACE AREA
(MINIMUM)
Figure B-3. Suggested Grounding Methods
a. Plate Electrode: An iron or steel plate, 1/4
inch (6,4 mm) thick, completely impeded in
the ground. The plate must present a surface
area of at least 2 square feet (1858,1 sq. cm.).
SOIL
3/4 INCH (19,1
MM) NOMINAL
DIAMETER
(MINIMUM)
8 FEET
(2,4 M)
b. Driven Electrode: A rod or pipe, 3/4 inch
(19,1 mm) in diameter minimum, 8 feet (2,4 m)
long, completely driven into the ground.
SOIL
3/4 INCH (19,1 MM)
NOMINAL DIAMETER
(MINIMUM) 8 FEET
(2,4 M) LONG
ROCK
PAGE B - 5INSTALLATION
OM-06259 S SERIES PUMPS
c. Buried electrode: If rock or stone prevents
embedding the full 8 foot (2,4 m) length of the
ground rod, bury it horizontally in a trench.
Space the ground rod or plates at least 6 feet
(1,8) from any other electrode or ground rod,
such as those used for signal circuits, radio
grounds, lightning rods, etc.
The earth surrounding the ground rod or plate
must contain enough moisture to make a
good electrical connection. In dry or sandy
areas, pour water around the rod, or consult
qualified personnel to devise a method of im
proving the connections.
The electrical power used to operate
this pump is high enough to cause inju
ry or death. Make certain that the control
box is properly grounded after installa
tion.
Refer to the literature accompanying the control
box for field wiring connections.
Pump Power Cable Connections
this pump is high enough to cause inju
ry or death. Obtain the services of a
qualified electrician to make all electri
cal connections. Make certain that in
coming power to the control box is in the
OFF position and locked out, or that the
power supply to the control box has
been otherwise cut off and locked out,
before connecting power or accessory
cables.
The pump is provided with a 50 ft. (15,2 m) power
cable (see Table B-4 for standard power cable
specifications). If a longer cable is required, an op
tional cable assembly must be ordered from the
factory. Splicing of the power cable is not recom
mended by the Gorman‐Rupp Company due to
safety and warranty considerations.
Never attempt to alter the length or re
pair any power cable with a splice. The
pump motor and cable must be com
pletely waterproof. Injury or death may
result from alternations.
The electrical power used to operate
Table B‐4. Pump Power Cable Specifications
DC
Amp
Cable
A.W.G
Pump
Model
S8B
NOTE: * Amp Rating at 30C (86F) Canada Use Type SOW Cable
When necessary to change or connect the pump
power cable to the control box, make certain the in
coming power is OFF and LOCKED OUT, Make
certain the control box is PROPERLY GROUNDED
PAGE B - 6 INSTALLATION
Voltage/
Phase
460/3
575/3
** Amp Rating at 40C (104F)
Cable
Size
1 1.51 (38) 0.38 (9,6) 161** GGC 0.13
O.D.
Inches
(mm)
Conductor
Dia.
Inches
(mm)
Rating
(See
Note
Below)
and that the electrical data on the control matches
the motor name plate data.
Cable
Type
Resistance
(ohms) at
25C (77F)
per 1000 ft.
(305 m)
Voltage
Drop
per 100 ft.
(30,5m) at
Max. Load
3.51
2.81
S SERIES PUMPS
OM-06259
Connect the pump power cable to the control box
as shown in the wiring diagrams in the control box
manual. Use conduit or cable clamps to secure the
power cable to the control box. Make certain that
all connections are tight and that cable entry points
are rainproof.
NOTE
The power cable furnished with the pump includes
three electrical conductors (white, red, and black),
two grounding conductors (green) and one ground
check conductor (yellow). The yellow ground
check lead is used in conjunction with customer‐
supplied ground monitoring equipment. If this
equipment is not used, the yellow lead should be
used as a ground conductor.
Control Box Specifications
Any control box used to operate the
pump must be approved by the Gor
man‐Rupp Company for the application.
Motor Cable Grounding Test
NOTE
For reference, internal motor wiring connections
are shown in Maintenance and Repair - Section
E.
Liquid Level Devices
The standard pump is not furnished with a means
to automatically regulate liquid level. However, the
pump may be controlled to perform filling or dewa
tering functions by using either of the following op
tional sensing devices (see Figure B-4):
Diaphragm Type: two fixed‐position sen
sors (upper and lower) each contain a dia
phragm which flexes with changes in liquid
level, thus activating an enclosed miniature
switch.
Bulb (Float) Type: a bulb raises or lowers
(floats) with the liquid level, thus activating
an enclosed miniature switch.
The liquid level circuitry may be prewired as a fac
tory option, or easily added to the standard control
box in the field by qualified personnel. The unit is
complete except for the remote float switches. For
installation and operation, see the detailed instruc
tions included with the optional package.
Do not connect the pump control cable
to the control box or incoming voltage
before verifying the pump ground;
otherwise, personnel will be exposed to
serious injury or death.
Using a volt‐ohm meter, connect one lead to the
motor cable green/yellow ground lead. Connect
the other lead to an uninsulated point on the pump
body. The test circuit should close.
If the test circuit does not close, there is a defect in
the cable or motor which must be corrected.
Control Box Connections
This pump is shipped completely wired for the volt
age shown on the name plate, and is ready for op
eration through an approved control box.
Ground and wire the control box in accordance
with the instructions accompanying it.
Liquid level devices must be positioned far
enough apart to allow 10 minutes between
starts. If the pump motor cycles more than
6 starts per hour, it will over‐heat, resulting
in damage to the motor windings or control
box components.
Other types of liquid level devices may also be
used. Consult the factory for the liquid level device
best suited for your application.
If the pump requires liquid level devices,
install the liquid level devices and connect
them to the control box in accordance with
the instructions accompanying the de
vices.
PAGE B - 7INSTALLATION
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