Gorman-Rupp Pumps PA6C60C-B-E50 User Manual

ACDEU

OM-06531-01

February 6, 2012

INSTALLATION, OPERATION,

AND MAINTENANCE MANUAL

WITH PARTS LIST

PA SERIES PUMPS

MODELS

PA6C60C‐B‐E50 460/575/3

PA6C60C-B-(E50)

THE GORMAN‐RUPP COMPANY  MANSFIELD, OHIO

www.grpumps.com

GORMAN‐RUPP OF CANADA LIMITED  ST. THOMAS, ONTARIO, CANADA Printed in U.S.A.

2012 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....................................

Pump Dimensions PAGE B - 1.....................................................

PREINSTALLATION INSPECTION PAGE B - 2............................................

POSITIONING PUMP PAGE B - 2.......................................................

Lifting PAGE B - 2.................................................................

Mounting PAGE B - 2.............................................................

SUCTION AND DISCHARGE PIPING PAGE B - 3.........................................

Materials PAGE B - 3..............................................................

Line Configuration PAGE B - 3......................................................

Connections to Pump PAGE B - 3..................................................

Gauges PAGE B - 3...............................................................

SUCTION LINES PAGE B - 3...........................................................

Fittings PAGE B - 3...............................................................

Strainers PAGE B - 3..............................................................

Sealing PAGE B - 4...............................................................

Suction Lines In Sumps PAGE B - 4.................................................

Suction Line Positioning PAGE B - 4................................................

DISCHARGE LINES PAGE B - 5........................................................

Siphoning PAGE B - 5.............................................................

Valves PAGE B - 5................................................................

ELECTRICAL CONNECTIONS PAGE B - 5...............................................

Grouding Methods PAGE B - 6.....................................................

Field Wiring Connections (Incoming Power) PAGE B - 6...............................

Voltage Imbalance PAGE B - 7.....................................................

Power Cable Connections PAGE B - 7...............................................

Control Box Adjustment PAGE B - 7.................................................

ALIGNMENT PAGE B - 7..............................................................

AUTO‐START PAGE B - 8.............................................................

Float Switch Installation PAGE B - 8.................................................

Submersible Transducer Installation PAGE B - 9......................................

OPERATION - SECTION C PAGE C - 1......................................

STARTING AND OPERATION PAGE C - 1...............................................

Control Box Function PAGE C - 1...................................................

Component Function PAGE C - 1...................................................

Rotation PAGE C - 2..............................................................

Priming PAGE C - 2...............................................................

Leakage PAGE C - 2..............................................................

Pump Vacuum Check PAGE C - 3..................................................

Priming Chamber Discharge Line PAGE C - 3........................................

Liquid Temperature And Overheating PAGE C - 3.....................................

Strainer Check PAGE C - 3.........................................................

STOPPING PAGE C - 3................................................................

Manual Stopping PAGE C - 3.......................................................

i

TABLE OF CONTENTS

(continued)

Automatic Stopping PAGE C - 3....................................................

PERIODIC CHECKS PAGE C - 3.......................................................

Seal Cavity and Bearing Lubrication PAGE C - 3......................................

Bearing Temperature Check PAGE C - 3.............................................

Air Compressor Drive Belt PAGE C - 4...............................................

COLD WEATHER PRESERVATION PAGE C - 4...........................................

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........................................

PARTS LISTS:

Pump Model PAGE E - 3..........................................................

Pump End Assembly PAGE E - 5...................................................

Repair Rotating Assembly PAGE E - 9...............................................

Priming Chamber Kit PAGE E - 10...................................................

Priming Chamber Assembly PAGE E - 11.............................................

Air Compressor Assembly PAGE E - 12...............................................

PUMP AND SEAL DISASSEMBLY AND REASSEMBLY PAGE E - 13.........................

Priming Chamber Removal And Disassembly PAGE C - 14..............................

Discharge Check Valve Removal and Disassembly PAGE C - 14.........................

Back Cover Plate and Wear Plate Removal PAGE C - 14................................

Separating Pump And Drive Assembly From Engine PAGE C - 14........................

Draining Oil From Seal Cavity PAGE C - 15............................................

Loosening Impeller PAGE C - 15.....................................................

Pump Casing Removal PAGE C - 15.................................................

Impeller Removal PAGE C - 16......................................................

Seal Removal PAGE C - 16..........................................................

Shaft and Bearing Removal and Disassembly PAGE C - 16.............................

Shaft and Bearing Reassembly and Installation PAGE C - 17............................

Seal Reassembly and Installation PAGE C - 18........................................

Impeller Installation And Adjustment PAGE C - 20......................................

Pump Casing Installation PAGE C - 20................................................

Securing Pump End To Power Source PAGE C - 20....................................

Wear Plate and Back Cover Installation And Adjustment PAGE C - 20....................

Discharge Check Valve Reassembly And Installation PAGE C - 21.......................

Priming Chamber Assembly And Installation PAGE C - 22...............................

LUBRICATION PAGE C - 22.............................................................

Seal Assembly PAGE C - 22.........................................................

Bearings PAGE C - 22..............................................................

ii

INTRODUCTION

OM-06531PA SERIES

Thank You for purchasing a Gorman‐Rupp pump.
Read this manual carefully to learn how to safely

install and operate your pump. Failure to do so
could result in personal injury or damage to the
pump.

This pump is a PA Series, priming‐assisted centrif
ugal model. The unit is designed for handling non‐
volatile, non‐flammable liquids containing speci
fied entrained solids. The basic material of con
struction is ductile iron, with stainless steel shaft
and ductile iron wearing parts.

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.

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 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:

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.

The Gorman‐Rupp Company

P.O. Box 1217

Mansfield, Ohio 44901-1217

Phone: [phone]

or:

Gorman‐Rupp of Canada Limited

70 Burwell Road

St. Thomas, Ontario N5P 3R7

Phone: [phone]

For information or technical assistance on the en
gine, contact the local power source representa
tive.

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
damage which could result from failure to
follow the procedure.

NOTE

Instructions to aid in installation, operation, and
maintenance or which clarify a procedure.

PAGE I - 1INTRODUCTION

PA SERIES

OM-06531

SAFETY ‐ SECTION A

This information applies to Prime Air
Series pumps. Refer to the manual ac
companying the power source before
attempting to begin operation.

This manual will alert personnel to
known procedures which require spe
cial attention, to those which could
damage equipment, and to those which
could be dangerous to personnel.

How

ever, this manual cannot possibly antici
pate and provide detailed instructions
and precautions for every situation that
might occur during maintenance of the
unit. Therefore, it is the responsibility of
the owner/maintenance personnel to
ensure that only safe, established main
tenance procedures are used, and that
any procedures not addressed in this
manual are performed only after estab
lishing that neither personal safety nor
pump integrity are compromised by
such practices.

Before attempting to install, operate, or
wire the pump control box, familiarize
yourself with this manual, and with all
other literature shipped with the control
box. Unfamiliarity with all aspects of
control operation covered in this manu
al could lead to destruction of equip
ment, injury, or death to personnel.

Before connecting any cable to the con
trol box, be sure to ground the control
box. See Section B for suggested
grounding methods.

r

The control box provides overload pro
tection and power control. Do not con
nect the pump motor directly to the in
coming power lines. If the power circuit
breaker or overload relay is tripped dur
ing operation, correct the problem be
fore resetting or replacing.

The electrical power used to operate the
pump control box is high enough to
cause injury or death. Obtain the ser
vices of a qualified electrician to make
all electrical connections. Make certain
that the enclosure is properly
grounded; never use gas pipe as an
electrical ground. Be sure that the in
coming power matches the voltage and
phase of the control before connecting
the power source. Do not make electri
cal connections if the voltage is not
within the limits. If the overload unit is
tripped during operation, correct the
problem before restarting.

The electrical power used to operate the
pump control box is high enough to
cause injury or death. Make certain that
the control handle on the control box is
in the OFF position and locked out be
fore attempting to service the pump. Be
fore attempting to open or service the
control box, disconnect and/or lock out
the power supply to the control box. Tag
electrical circuits to prevent accidental
start‐up.

PAGE A - 1SAFETY

Obtain the services of a qualified elec
trician to troubleshoot, test and/or ser
vice the electrical components of the
control box.

Before attempting to open or service the
pump:

1. Familiarize yourself with this man
ual.

2. Turn the control box selector
switch to `OFF' and lock it out to en
sure that the pump will remain in
operative.

3. Allow the pump to completely cool
if overheated.

4. Check the temperature before
opening any covers, plates, or
plugs.

5. Close the suction and discharge
valves.

6. Vent the pump slowly and cau
tiously.

7. Drain the pump.

PA SERIESOM-06531

these parts with great force when they
are disengaged. Allow the pump to
completely cool before servicing it.

This pump is designed to handle most
non‐volatile, non‐flammable liquids
containing specified entrained solids.
Do not attempt to pump volatile, corro
sive, or flammable liquids which may
damage the pump or endanger person
nel as a result of pump failure.

Use lifting and moving equipment in
good repair and with adequate capacity
to prevent injuries to personnel or dam
age to equipment. Attach lifting equip
ment 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 positioned so as not to
damage the pump, and so that the load
will be balanced. The bail is intended for
use in lifting the pump assembly only.
Suction and discharge hoses and pip
ing must be removed from the pump be
fore lifting.

This pump may be equipped with an op
tional automatic starting system, and
therefore subject to automatic restart.
Keep hands and clothing away from the
unit to prevent injury during automatic

After the pump has been installed, make
certain that the pump and all piping or
hose connections are tight, properly

supported and secure before operation.
operation. Lock out the power from the
control box to ensure that the pump will
remain inoperative. Failure to do so
may result in serious personal injury.

Do not operate the pump against a

closed discharge valve. If operated

against a closed discharge valve, pump

components will deteriorate, and the
Do not attempt to disengage any part of

an overheated pump unit. Vapor pres
sure within the pump casing can eject

PAGE A - 2 SAFETY

liquid could come to a boil, build pres

sure, and cause the pump casing to rup

ture or explode. Momentary closure of a

PA SERIES

OM-06531

discharge valve is acceptable only
when required for startup or shutdown
procedures.

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 cool completely before
servicing.

Do not operate the pump without guards

in place over the rotating parts. Ex

posed rotating parts can catch clothing,

fingers or tools, causing severe injury to

personnel.

Pumps and related equipment must be in

stalled and operated according to all na

tional, local and industry standards.

Make sure the pump is level. Lower jack

stands and chock the wheels, if so

equipped.

PAGE A - 3SAFETY

PA SERIES OM-06531

INSTALLATION - SECTION B

Review all SAFETY information in Section A.

Since pump installations are seldom identical, this
section offers only general recommendations and
practices required to inspect, position, and ar
range the pump and piping.

Most of the information pertains to a standard
static lift application where the pump is positioned
above the free level of liquid to be pumped.

If installed in a flooded suction application where
the liquid is supplied to the pump under pressure,
some of the information such as mounting, line

OUTLINE DRAWING

configuration, and priming must be tailored to the

specific application. Since the pressure supplied

to the pump is critical to performance and safety,

be sure to limit the incoming pressure to 50% of the

maximum permissible operating pressure as

shown on the pump performance curve.

For further assistance, contact your Gorman‐Rupp

distributor or the Gorman‐Rupp Company.

Pump Dimensions

See Figure 1 for the approximate physical dimen

sions of this pump.

Figure 1. Pump Model PA6C60C-B-E50 460/575/3

PAGE B - 1INSTALLATION

OM-06531 PA SERIES

PREINSTALLATION INSPECTION

The pump assembly was inspected and tested be
fore shipment from the factory. Before installation,
inspect the pump for damage which may have oc
curred during shipment. Check as follows:

a. Inspect the pump for cracks, dents, damaged

threads, and other obvious damage.

b. Check for and tighten loose attaching hard

ware. Since gaskets tend to shrink after dry
ing, check for loose hardware at mating sur
faces.

c. Compare the amperes, phase, voltage and

hertz indicated on the pump motor nameplate
to the ratings indicated for the control box.

d. Carefully read all tags, decals, and markings

on the pump assembly, and perform all duties
indicated. Note that the pump shaft rotates in
the required direction.

POSITIONING PUMP

Use lifting and moving equipment in

good repair and with adequate capacity

to prevent injuries to personnel or dam

age to equipment. Attach lifting equip

ment 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 positioned so as not to

damage the pump, and so that the load

will be balanced. The bail is intended for

use in lifting the pump assembly only.

Suction and discharge hoses and pip

ing must be removed from the pump be

fore lifting.

Lifting

Only operate this pump in the direction in
dicated by the arrow on the pump body
and on the accompanying decal. Other
wise, the impeller could become loosened
from the shaft and seriously damage the
pump.

e. Check levels and lubricate as necessary. Re

fer to LUBRICATION in the Maintenance and
Repair Manual and perform duties as in
structed.

f. If the pump has been stored for more than 12

months, some of the components or lubri
cants may have exceeded their maximum
shelf life. These must be inspected or re
placed to ensure maximum pump service.

If the maximum shelf life has been exceeded, or if
anything appears to be abnormal, contact your
Gorman‐Rupp distributor or the factory to deter
mine the repair or updating policy. Do not put the
pump into service until appropriate action has
been taken.

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.

The pump assembly can be seriously

damaged if the chains or cables used to lift

and move the unit are improperly wrapped

around the pump.

Mounting

Locate the pump in an accessible place as close as

practical to the liquid being pumped. Level mount

ing is essential for proper operation.

The pump may have to be supported or shimmed

to provide for level operation or to eliminate vibra

tion.

PAGE B - 2 INSTALLATION

PA SERIES OM-06531

to secure them when filled with liquid and under

pressure.

If the pump has been mounted on a
movable base, do not attempt to operate
the pump unless the unit is level. Be
sure the leveling stands are positioned
on a solid surface, and the wheels are
chocked.

SUCTION AND DISCHARGE PIPING

Pump performance is adversely effected by in
creased suction lift, discharge elevation, and fric
tion losses. See the performance curve and oper
ating range shown on Page E‐1 to be sure your
overall application allows pump to operate within
the safe operation range.

Materials

Either pipe or hose maybe used for suction and
discharge lines; however, the materials must be
compatible with the liquid being pumped. If hose is
used in suction lines, it must be the rigid‐wall, rein
forced type to prevent collapse under suction. Us
ing piping couplings in suction lines is not recom
mended.

Line Configuration

Keep suction and discharge lines as straight as
possible to minimize friction losses. Make mini
mum use of elbows and fittings, which substan
tially increase friction loss. If elbows are necessary,
use the long‐radius type to minimize friction loss.

Connections to Pump

Gauges

The pump is drilled and tapped for installing dis

charge pressure and vacuum suction gauges. It is

recommended that gauges be installed to monitor

pump performance. Seal the gauge threads with

pipe dope to ensure an airtight seal. Follow the

sealant manufacturer's recommendations when

selecting and applying the pipe dope. The pipe

dope should be compatible with the liquid being

pumped.

SUCTION LINES

To avoid air pockets which could affect pump prim

ing, the suction line must be as short and direct as

possible. When operation involves a suction lift, the

line must always slope upward to the pump from

the source of the liquid being pumped; if the line

slopes down to the pump at any point along the

suction run, air pockets will be created.

Fittings

Suction lines should be the same size as the pump

inlet. If reducers are used in suction lines, they

should be the eccentric type, and should be in

stalled with the flat part of the reducers uppermost

to avoid creating air pockets. Valves are not nor

mally used in suction lines, but if a valve is used,

install it with the stem horizontal to avoid air pock

ets.

Strainers

Be certain to use the strainer furnished with the

pump; any spherical solids which pass through the

strainer will also pass through the pump itself.

Before tightening a connecting flange, align it ex
actly with the pump port. Never pull a pipe line into
place by tightening the flange bolts and/or cou
plings.

Lines near the pump must be independently sup
ported to avoid strain on the pump which could
cause excessive vibration, decreased bearing life,
and increased shaft and seal wear. If hose‐type
lines are used, they should have adequate support

If a strainer not furnished with the pump is installed

by the pump user, make certain that the total area

of the openings in the strainer is at least three or

four times the cross section of the suction line, and

that the openings will not permit passage of solids

larger than the solids handling capability of the

pump.

This pump is designed to handle up to 3 inch (76,2

mm) diameter spherical solids.

PAGE B - 3INSTALLATION

OM-06531 PA SERIES

Sealing

Since even a slight leak will affect priming, head,
and capacity, especially when operating with a
high suction lift, all connections in the suction line
should be sealed with pipe dope to ensure an air
tight seal. Follow the sealant manufacturer's rec
ommendations when selecting and applying the
pipe dope. The pipe dope should be compatible
with the liquid being pumped.

Suction Lines In Sumps

If a single suction line is installed in a sump, it
should be positioned away from the wall of the
sump at a distance equal to 1 1/2 times the diame
ter of the suction line.

If there is a liquid flow from an open pipe into the
sump, the flow should be kept away from the suc
tion inlet because the inflow will carry air down into
the sump, and air entering the suction line will re
duce pump efficiency.

If it is necessary to position inflow close to the suc
tion inlet, install a baffle between the inflow and the
suction inlet at a distance 1‐1/2 times the diameter
of the suction pipe. The baffle will allow entrained

air to escape from the liquid before it is drawn into

the suction inlet.

If two suction lines are installed in a single sump,

the flow paths may interact, reducing the efficiency

of one or both pumps. To avoid this, position the

suction inlets so that they are separated by a dis

tance equal to at least 3 times the diameter of the

suction pipe.

Suction Line Positioning

The depth of submergence of the suction line is

critical to efficient pump operation. Figure 2

shows recommended minimum submergence vs.

velocity.

Although not recommended, the vacuum assisted

priming feature allows the pump to be operated

temporarily in a “slurping” application with varying

water levels.

NOTE

The pipe submergence required may be reduced

by installing a standard pipe increaser fitting at the

end of the suction line. The larger opening size will

reduce the inlet velocity. Calculate the required

submergence using the following formula based

on the increased opening size (area or diameter).

PAGE B - 4 INSTALLATION

PA SERIES OM-06531

Figure 2. Recommended Minimum Suction Line Submergence vs. Velocity

DISCHARGE LINES

Siphoning

Do not terminate the discharge line at a level lower
than that of the liquid being pumped unless a si
phon breaker is used in the line. Otherwise, a si
phoning action causing damage to the pump
could result.

Valves

This pump is designed with a check valve in the
discharge line.

If a throttling valve is desired in the discharge line,
use a valve as large as the largest pipe to minimize
friction losses. Never install a throttling valve in a
suction line.

With high discharge heads, it is recommended that
a throttling valve be installed in the discharge line
to protect the pump from excessive shock pres
sure and reverse rotation when it is stopped.

If the application involves a high discharge

head, gradually close the discharge

throttling valve before stopping the pump.

ELECTRICAL CONNECTIONS

Obtain the services of a qualified elec

trician to make all electrical connec

tions and to service the control box.

The electrical power used in this control

box is high enough to cause injury or

death. Make certain that the control box

is properly grounded after installation.

Make certain that the power source

phase and voltage matches the data on

PAGE B - 5INSTALLATION

OM-06531 PA SERIES

the control box. Complete all electrical
connections before connecting the
power supply to the control box. Make
certain to ground the appropriate lead
of the power source before connecting
power to the control. Make certain that
the control box is properly grounded af
ter installation.

Grounding Methods

Electrically ground the installation before connect
ing the field wiring to the control box. Install a

a) PLATE ELECTRODE b) DRIVEN ELECTRODE c) BURIED ELECTRODE

SOIL

1/4 INCH STEEL

PLATE 2 SQ. FEET

(1858,1 SQ. CM)
SURFACE AREA

(MINIMUM)

SOIL

3/4 INCH (19,1

MM) NOMINAL

DIAMETER

(MINIMUM)

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 3 for some suggested ground

ing methods.

SOIL

8 FEET
(2,4 M)

3/4 INCH (19,1 MM)

NOMINAL DIAMETER

(MINIMUM) 8 FEET

(2,4 M) LONG

ROCK

Figure 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).

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.

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 m) from any other electrode or ground
rod, such as those used for signal circuits, ra
dio 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 ar
eas, pour water around the rod, or consult
qualified personnel to devise a method of im
proving the connection.

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 qu

alified electrician to make all electrical

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.

The control is designed to regulate the power sup

ply. The field wiring must be properly sized to en

sure an adequate voltage supply. The voltage

PAGE B - 6 INSTALLATION

PA SERIES OM-06531

available at the pump motor must be within the in
dicated range.

Table 1. Pump Motor Voltage Limits

Nominal
Voltage

460 3 414 506

575 3 517 632

If the voltage is not within the recommended limits,
obtain the services of a qualified electrician to de
termine the correct field wiring size and other de
tails to ensure an adequate voltage supply.

Make certain all connections are tight and that ca
ble entry points are rainproof. Support the cable
weight, if required, to prevent excessive strain on
cable clamps and cable.

Phase

Minimum
Voltage

Maximum
Voltage

NOTE

After the power cables have been connected to the
control box, make certain the connection is water
proof.

Voltage Imbalance

Each phase of the incoming three‐phase power
must be balanced with the other two as accurately
as a commercial voltmeter will read. If the phases
are out of balance, contact your power company
and request that they correct the condition.

When necessary to change or connect power

cables to the control box, make certain the incom

ing power is OFF and LOCKED OUT. Make certain

the control box is properly grounded and that the

electrical data on the control matches the pump

motor name plate data.

Connect the power cable to the control box as

shown in the wiring diagrams in this section or in

side the control box door. Use conduit or cable

clamps to secure the power and accessory cables

to the control box. Make certain that all connec

tions are tight and that cable entry points are

rainproof.

Control Box Adjustments

For control adjustments and settings, refer to the

information inside the control box door.

To maintain overcurrent, short circuit

and ground fault protection, the man

ufacturer's instructions for selection of

the heater pack and setting of the in

stantaneous trip circuit breaker (current

interrupter) or control interface module

must be followed. Failure to follow these

instructions can result in damage to the

pump and/or serious injury to person

nel.

ALIGNMENT

Power Cable Connections

The electrical power used to operate the
control box is high enough to cause in
jury 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 alignment of the pump and motor is critical for

trouble‐free mechanical operation. In a flexible

coupling system, the driver and pump must be

mounted so that their shafts are aligned with and

parallel to each other. It is imperative that alignment

be checked after the pump and piping are in

stalled, and before operation.

NOTE

Check Rotation, Section C, before final alignment

of the pump.

When mounted at the Gorman‐Rupp factory, driver

and pump are aligned before shipment. Misalign

ment will occur in transit and handling. Pumps

must be checked and realigned before operation.

PAGE B - 7INSTALLATION

OM-06531 PA SERIES

Before checking alignment, tighten the foundation
bolts. The pump casing feet and/or pedestal feet,
and the driver mounting bolts should also be tightly
secured.

When checking alignment, disconnect
the power source to ensure that the
pump will remain inoperative.

Adjusting the alignment in one direction
may alter the alignment in another direc
tion. Check each procedure after altering
alignment.

AUTO‐START

The pump may be equipped with an optional auto‐
start control system which allows the pump to start
and stop as the liquid level in the wet well or sump
rises and falls.

Refer to the information which follows for installa
tion details for the optional liquid level sensing sys
tem.

equipped with a socket type connector that plugs

into a matching receptacle on the auto‐start control

box.

Standard floats are equipped with 50 feet (15,2 m)

of cable.

When installing the floats, note the following:

a. Be sure to provide sufficient room in the wet

well or sump so that floats do not get ob
structed or drawn into the suction line. If a flex
ible suction hose is used, it may be extended
to lay along the bottom of the wet well or sump
and the float can be attached to the hose
above the point where it bends along the bot
tom. Direct the suction line toward the flow,
and the float(s) away from the flow. If a stand
pipe is available, attach the float switch cable
to the standpipe in the sump at the approxi
mate desired liquid level.

b. In a single float system, the cable can be teth

ered to the suction line or standpipe approxi
mately 6 inches (152 mm) above the float.
This setting allows approximately 9 inches
(229 mm) of liquid rise between pump start/
stop. The start/stop interval may be increased
by extending the float end of the cable. The
liquid level in the sump will increase approxi
mately 8 inches (203 mm) between start/stop
intervals for every 6 inches (152 mm) of cable
increase.

Float Switch Installation

The Float Switch autostart system employs either a
single or double float switch, where a bulb raises or
lowers (floats) with the liquid level, thus activating
an enclosed miniature switch. The floats are

PAGE B - 8 INSTALLATION

c. If a double float switch system is used, posi

tion the “Start” float at the desired high water
level in the sump, and the “Stop” float at the
desired low water level in the pump.

d. Refer to Figure 4 for additional float switch

data.