Grundfos SRG 60 Hz User manual

GRUNDFOS INSTRUCTIONS
SRG
60 Hz, North America
Installation and operating instructions

English (US)
2
English (US) Installation and operating instructions
Original installation and operating instructions
These installation and operating instructions describe Grundfos
SRG 60 Hz recirculation pumps.
Sections 2-6 gives the information necessary to unpack, install
and start up the product in a safe way.
Sections 7-11 give important information about the product, as
well as, information on service, fault finding, and disposal of the
product.
CONTENTS
Page
1. Limited warranty
New equipment manufactured by seller or service supplied by
seller is warranted to be free from defects in material and
workmanship under normal use and service for a minimum of
twelve (12) months from date of installation, eighteen (18) months
from date of shipment, unless otherwise stated in product
warranty guide (available upon request). In the case of spare or
replacement parts manufactured by seller, the warranty period
shall be for a period of twelve months from shipment. Seller's
obligation under this warranty is limited to repairing or replacing,
at its option, any part found to its satisfaction to be so defective,
provided that such part is, upon request, returned to seller's
factory from which it was shipped, transportation prepaid. Parts
replaced under warranty shall be warranted for twelve months
from the date of the repair, not to exceed the original warranty
period. This warranty does not cover parts damaged by
decomposition from chemical action or wear caused by abrasive
materials, nor does it cover damage resulting from misuse,
accident, neglect, or from improper operation, maintenance,
installation, modification or adjustment. This warranty does not
cover parts repaired outside seller's factory without prior written
approval. Seller makes no warranty as to starting equipment,
electrical apparatus or other material not of its manufacture. If
purchaser or others repair, replace, or adjust equipment or parts
without seller's prior written approval, seller is relieved of any
further obligation to purchaser under this paragraph with respect
to such equipment or parts, unless such repair, replacement, or
adjustment was made after seller failed to satisfy within a
reasonable time seller's obligations under this paragraph. Seller's
liability for breach of these warranties (or for breach of any other
warranties found by a court of competent jurisdiction to have
been given by seller) shall be limited to: (a) accepting return of
such equipment exw plant of manufacture, and (b) refunding any
amount paid thereon by purchaser (less depreciation at the rate
of 15 % per year if purchaser has used equipment for more than
thirty [30] days), and canceling any balance still owing on the
equipment, or (c) in the case of service, at seller's option, redoing
the service, or refunding the purchase order amount of the
service or portion thereof upon which such liability is based.
These warranties are expressly in lieu of any other warranties,
express or implied, and seller specifically disclaims any implied
warranty of merchantability or fitness for a particular purpose, and
in lieu of any other obligation or liability on the part of the seller
whether a claim is based upon negligence, breach of warranty, or
any other theory or cause of action. In no event shall seller be
liable for any consequential, incidental, indirect, special or
punitive damages of any kind. For purposes of this paragraph, the
equipment warranted shall not include equipment, parts, and
work not manufactured or performed by seller. With respect to
such equipment, parts, or work, seller's only obligation shall be to
assign to purchaser the warranties provided to seller by the
manufacturer or supplier providing such equipment, parts or
work. No equipment furnished by seller shall be deemed to be
defective by reason of normal wear and tear, failure to resist
erosive or corrosive action of any fluid or gas, purchaser's failure
to properly store, install, operate, or maintain the equipment in
accordance with good industry practices or specific
recommendations of seller, including, but not limited to seller’s
installation and operation manuals, or purchaser's failure to
provide complete and accurate information to seller concerning
the operational application of the equipment.
1. Limited warranty 2
2. General information 3
2.1 Symbols used in this document 3
3. Safety instructions 3
4. Receiving the product 4
4.1 Transporting the product 4
4.2 Inspecting the product 4
4.3 Storing the product 4
5. Installing the product 5
5.1 Positioning 5
5.2 Torques 6
5.3 Mechanical installation 6
5.4 Electrical connection 8
5.5 Electrical protection 10
5.6 Protection against electro-chemical corrosion 11
6. Starting-up the product 12
7. Product introduction 12
7.1 Applications 12
7.2 Identification 13
8. Servicing the product 14
8.1 Contaminated pump 14
8.2 Service chart 15
8.3 Oil 16
8.4 Changing the oil 16
9. Fault finding the product 17
10. Technical data 18
10.1 General technical data 18
10.2 Motor 18
10.3 Gearbox 18
10.4 Shaft seals 18
10.5 Impeller 18
10.6 Sound pressure level 18
11. Disposing of the product 18
Prior to installation, read this document. Installation
and operation must comply with local regulations and
accepted codes of good practice.
The use of this product requires experience with and
knowledge of the product.
Persons with reduced physical, sensory or mental
capabilities must not use this product, unless they
are under supervision or have been instructed in the
use of the product by a person responsible for their
safety.
Children must not use or play with this product.

3
English (US)
2. General information
This booklet includes instructions for installing, starting-up and
servicing Grundfos 60 Hz recirculation pumps, type SRG,
designed for transfer of liquids of low to medium viscosity ( ≤500
cSt (mPas)) from one tank to another.
2.1 Symbols used in this document
The text accompanying the three hazard symbols DANGER,
WARNING and CAUTION will be structured in the following way:
3. Safety instructions
Receiving the product
Installing the product
DANGER
Indicates a hazardous situation which, if not avoided,
will result in death or serious personal injury.
WARNING
Indicates a hazardous situation which, if not avoided,
could result in death or serious personal injury.
CAUTION
Indicates a hazardous situation which, if not avoided,
could result in minor or moderate personal injury.
SIGNAL WORD
Description of hazard
Consequence of ignoring the warning.
- Action to avoid the hazard.
A blue or grey circle with a white graphical symbol
indicates that an action must be taken.
A red or grey circle with a diagonal bar, possibly with
a black graphical symbol, indicates that an action
must not be taken or must be stopped.
If these instructions are not observed, it may result in
malfunction or damage to the equipment.
Notes or instructions that make the work easier and
ensure safe operation.
DANGER
Electric shock
Death or serious personal injury
- Before starting any work on the product, make
sure that the fuses have been removed or the
mains switch has been switched off. Make sure
that the power supply cannot be accidentally
switched on.
These safety instructions as well as the instructions
in each individual section must be followed when
transporting, storing, handling and operating the
pump.
The pump must be installed, connected, started up
and serviced by qualified persons.
Beware of rotating parts.
Make sure that persons cannot accidentally fall into
the tank, e.g. by installing a cover or railing.
Make sure that the pump cannot roll or fall over.
Before attempting to lift or otherwise handle the
individual components of the pump, observe any
local regulations that set limits for the weight of the
components to be lifted manually by individuals, i.e.
handled without the use of lifting equipment.
DANGER
Electric shock
Death or serious personal injury
- Make sure the power supply to the control cabinet
has been switched off.
DANGER
Electric shock
Death or serious personal injury
- Before making any electrical connections, make
sure that the fuses have been removed or the
mains switch has been switched to off. Make sure
that the power supply cannot be accidentally
switched on.
DANGER
Electric shock
Death or serious personal injury
- When adjusting the relay, beware of electric
voltage.

English (US)
4
Starting-up the product
Servicing the product
Fault finding the product
4. Receiving the product
4.1 Transporting the product
The individual components of the pump must be packed carefully
to prevent any damage to the surface protection during
transportation.
4.2 Inspecting the product
On delivery, the pump and any accessories supplied with it must
be checked for transport damage. This also applies when the
equipment is delivered to the installation site.
If the pump or any accessories have been damaged during
transportation, contact your local Grundfos company before
continuing to install the equipment. Do not dismantle a damaged
new component for further inspection, unless instructed by your
local Grundfos company.
The packaging material must be disposed of according to local
regulations.
4.3 Storing the product
The pump must be stored in a dry location in which the
temperature is not subject to major fluctuations.
If the pump has been stored for more than one year, the gearbox
oil must be changed. The oil must be changed even if the pump
has never been in use. This is necessary because of natural
aging of mineral oil lubricants.
CAUTION
Pressurized System
Minor or moderate personal injury
- As pressure may have built up in the oil chamber,
do not remove the oil level bolt until the pressure
has been fully relieved.
Make sure that no persons can fall into the tank.
Before starting work on the pump,
– make sure that the fuses have been removed or
the mains switch has been switched off
– make sure that the power supply cannot be
accidentally switched on
– make sure all rotating parts have stopped
moving.
CAUTION
Biological hazard
Minor or moderate personal injury
- Flush the pump thoroughly with clean water and
rinse the pump parts in water after dismantling.
CAUTION
Pressurized system
Minor or moderate personal injury
- As pressure may have built up in the oil chamber,
do not remove the oil level bolt until the pressure
has been fully relieved.
Before starting work on the pump,
– make sure that the fuses have been removed or
the mains switch has been switched off
– make sure that the power supply cannot be
accidentally switched on
– make sure all rotating parts have stopped
moving.
Make sure that the pump cannot roll or fall over.
Before attempting to lift or otherwise handle the
individual components of the pump, observe any
local regulations that set limits for the weight of the
components to be lifted manually by individuals, i.e.
handled without the use of lifting equipment.
All lifting equipment must be rated for the purpose
and checked for damage before any attempts to lift
the components are made. The lifting equipment
rating must under no circumstances be exceeded.
Do not install a damaged pump.

5
English (US)
5. Installing the product
During installation, the pump must only be lifted when using the
suspension point.
The lifting equipment supplied with the pump as well as the wire
used for lifting and lowering the pump into the tank must not be
used as universal lifting equipment.
5.1 Positioning
Correct positioning of the pump is essential to ensure trouble-free
operation and long life. The following guidelines must be
observed:
• If more pumps are installed in the same tank, they must not
generate opposite flows.
• The distance from the center of the pump to the tank bottom
(Hmin) must be equal to the impeller diameter. See fig. 1.
• The distance from the top of the pump rack to the liquid
surface (HABOVE) must fulfil one of the following two
requirements:
– For pumps with vortex shield, the distance must at least be
equal to the impeller diameter.
– For pumps without vortex shield, the distance must at least
be equal to 1.5 times the impeller diameter. See fig. 1.
Fig. 1 Distance to liquid surface and tank bottom
Fig. 2 Open installation
* Guide claws are only available for SRG.xx.32.
Never hang the pump by the power supply cable.
Never let the pump run while suspended from the
lifting equipment.
TM02 9478 0215
Hmin HAbove
TM04 3962 0215
Pos. Designation
1Bottom fixation bracket and guide claws on
connection flange*
2 Column profile
5 Top fixation bracket
12 Crane foot
13 Crane with winch and lifting wire
15 Lifting wire incl. wire clamp
17 Cable clamp
18 Cable sock, incl. shackle ∅10
19 Intermediate fixation bracket
23 Connection flange
13
5
17
15
23
1
1
2
19
12
18

English (US)
6
5.2 Torques
All nuts and bolt s used for the installation must be made of
stainless steel.
Use grease (Alu-paste) together with a spring washer or lock nut;
otherwise, use Loctite or a similar product for lubrication and
locking.
Tighten all stainless-steel nuts and bolts to the following torques:
5.2.1 Anchor bolts
Anchor bolts used for mounting components in concrete must
have the following pull-out strength:
5.3 Mechanical installation
See section 5.2 Torques and fig. 2.
1. Weld the connection flange to the cast-in pipe end in the tank.
2. Weld the profile section to the connection flange and pipe
end. Place it in position 12 o'clock.
Fig. 3 Profile section on connection flange
3. SRG.xx.32.xx: Weld the guide claws to the connection flange.
See fig. 4.
Fig. 4 Position of guide claws
4. Drill the holes for the anchor bolts for the top fixation bracket
in the concrete.
5. Mount the bolts and fit the top fixation bracket.
6. Depending on the length of the column profile, weld the
turnable part of an intermediate fixation bracket to the column
profile.
Fig. 5 Top fixation
7. Position and align the column profile with the profile section
on the connection flange. Shorten the column profile (2) to the
correct length to match the position of epoxy insulator (C) at
the top fixation bracket. A gap of 0.20 to 0.40 in (5 to 10 mm)
between collar of epoxy and column profile is optimal. See fig.
5.
8. Remove the epoxy insulator and the turnable metal part by
removing the centre bolt (A) and the two fixation bolt (B).
9. Adapt the outside of the square epoxy insulator to the inside
of the column profile. The epoxy insulator must fit tightly
inside the column profile.
Size
Bolts
ASTM F593 (V/W)
[lbf (Nm)]
1/4" (M6) 6.5 (8.8)
5/16" (M8) 15.8 (21.4)
7/16" (M10) 32.5 (44)
1/2" (M12) 54.6 (74)
5/8" (M16) 135 (183)
3/4" (M20) 273 (370)
Size Pull-out strength
[kipf (kN)]
1/2" (M12) 1.35 (6)
5/8" (M16) 3.15 (14)
TM03 0572 0205
2.4 x 2.4 x 0.12
TM03 3028 0106TM04 2719 2908
(10)
1.0 0.6
A
C
B
31

7
English (US)
10. Place the column profile on the profile section on the
connection flange and mount the top end with the epoxy
insulator and the turnable metal part on the already installed
top fixation bracket. Tighten the three bolts (A) and (B) in the
desired position. It is possible to adjust the angle in steps of
7.5 °.
11. Fit an intermediate fixation bracket to the turnable part welded
on to the profile tube in step 6. Drill holes in the tank wall, fit
bolts in the bracket and tightening the bolts.
12. Drill the holes for the mounting bolts for the crane foot in the
concrete.
13. Mount the crane foot and fit and tighten the bolts.
14. Mount the lifting wire on the pump rack using the shackle. See
fig. 6.
Fig. 6 Mounting of lifting wire on the pump rack
15. Mount the top end of the safety wire to the hole (31, fig. 5) of
the top fixation bracket by means of a shackle. The other end
of the safety wire ends in a shackle through which the lifting
wire must run.
Fig. 7 Safety wire
16. Fix the power supply cable to the lifting wire by means of a
cable clamp approx. 2.6 ft (0.8 m) above the pump. This will
prevent the cable from falling down and becoming entangled
in the impeller during operation. Connect the cable clamp to
the lifting wire above the wire clamp by means of a snap hook.
See fig. 8. Attach the power supply cable to the lifting wire by
means of cable clamps placed at 3 ft (~1 m) intervals.
Fig. 8 Attaching the power supply cable to the lifting wire
17. Position the crane in the foot and mount the lifting wire in the
drum of the winch.
18. Lift the complete pump (pump rack with motor) using the
crane and slide it over the column profile.
19. Slowly lower the pump into the tank and down to position on
the connection flange.
TM04 4006 0215TM04 3932 4914
15
TM02 4938 1802
Always leave at least three turns of wire on the drum.
Otherwise the wire may break loose from the drum
fixation.
Follow the separate installation and operating
instructions for cranes.
Power supply
cable
Wire clamp
Lifting wire
(15)
Snap hook
Cable clamp
(17)

English (US)
8
20. Mount the cable sock (18) to the top fixation bracket using the
shackle, and pull the motor cable through it to the desired
position. See fig. 9. The power supply cable should be slightly
tightened.
Fig. 9 Top fixation bracket with lifting and safety wires and
cable sock
21. Remove the lifting wire from the winch and fit it to the wire
clamping (20) on the top fixation bracket.
Use the lifting wire as a relief for the power supply cable. For this
reason, the lifting wire must always be tightened.
22. Connect the power supply cable to the terminals in the control
cabinet.
5.4 Electrical connection
The electrical connections must be carried out by a qualified
electrician in accordance with local regulations.
All national and local regulations relating to safety and accident
prevention must be observed.
The supply voltage and frequency are marked on the pump
nameplate. Make sure that the pump is suitable for the power
supply available at the installation site.
The pump is supplied complete with a power supply cable of 33 ft
(10 m) which is standard length suitable for up to 22 ft (7 m) deep
tanks. Standard cable lengths are 33 and 49 ft (10 and 15 m),
longer cables are available on request. See section
7.2 Identification.
The motor is marked either with a Y (star) or Δ(delta). Make this
connection in an external control panel using conductors 1 to 6 of
the power supply cable.
Figure 10 shows a schematic drawing of these star and delta
connections. See also section 5.4.2 Wiring diagrams.
5.4.1 Starting method
Start the recirculation pump via a soft starter or frequency
converter.
TM04 3929 2813
Remove the lifting wire from the crane before starting
the pump.
DANGER
Electric shock
Death or serious personal injury
- Make sure the power supply to the control cabinet
has been switched off.
20
18
31
B
DANGER
Electric shock
Death or serious personal injury
- Before making any electrical connections, make
sure that the fuses have been removed or the
mains switch has been switched to off. Make sure
that the power supply cannot be accidentally
switched on.

9
English (US)
5.4.2 Wiring diagrams
For voltage and starting method 1H, wire the motor using the
delta connection. For voltage and starting method 0H, wire the
motor using the star connection.method. Connection methods are
shown in fig. 10. See also section 7.2.2 Nameplate, fig. 16,
position 1 and section 7.2.1 Type key to determine your pump's
voltage and starting method.
Fig. 10 Schematic drawing of delta and star connection
Fig. 11 Three thermal switches (PTO)
Fig. 12 Three PTC sensors
5.4.3 Direction of rotation
When the electrical connections have been carried out, check
that the impeller is rotating in the correct direction. When viewed
from the motor, the impeller must rotate clockwise. An arrow on
the motor housing shows the correct direction of rotation.
If the impeller rotates in the wrong direction, interchange two
phases of the mains supply (L1, L2, L3).
5.4.4 Frequency converter operation
All SRG pumps are designed for frequency converter operation
for energy saving and for soft start. For frequency converter
operation, please observe the following information:
• Requirements must be fulfilled.
• Recommendations ought to be fulfilled.
• Consequences must be considered.
TM02 4953 2002TM06 66736 2316
Terminals Description
1, 2, 3, 4, 5, 6 Ends of the three stator windings
(U1, U2, V1, V2, W1, W2)
11, 12 Thermal switches (F6)
21, 22 Leak sensor in gearbox (B)
W2
U1
U2
V1
V2
W1
L1 L2 L3
W2
U1
U2
V1
V2
W1
L1 L2 L3
Star
Delta
F6
F6
F6 B
W2
W1U1
U2 V2
V1
M3~
TM06 6737 2316
Terminals Description
1, 2, 3, 4, 5, 6 Ends of the three stator windings
(U1, U2, V1, V2, W1, W2)
31, 32 PTC sensors (according to DIN 44 081)
(ϑ1, ϑ2, ϑ3)
21, 22 Leak sensor in gearbox (B)
B
M3~
W2
W1U1
U2 V2
V1

English (US)
10
5.4.5 Requirements
• Peak voltage and dU/dt must be in accordance with the table
below. The values stated are maximum values supplied to the
motor terminals. The cable influence has not been taken into
account. See the frequency converter data sheet regarding the
actual values and the cable influence on the peak voltage and
dU/dt.
• In case the above values are too high, a dU/dt filter could
prevent the voltage peaks.
• The thermal protection of the motor must be connected.
• Do not exceed the frequency indicated on the nameplate.
Otherwise, there is a risk of motor overload.
• Local regulations or standards must be fulfilled.
5.4.6 Recommendations
• Do not reduce the motor speed to less than 30 % of the rated
speed.
• Do not set any slip compensation, as it may lead to an over
speed and therefore to motor overload.
• Set the frequency converter U/f ratio to a linear relation, and
use the data from the motor nameplate for settings about rated
current, power, voltage and frequency.
• Use input and output filters on the frequency converter. See
data sheet for the frequency converter used.
• Keep the power cable as short as possible. The peak voltage
will increase with the length of the power cable. See data
sheet for the frequency converter used.
• Use a screened power cable if there is a risk that electrical
noise can disturb other electrical equipment. See data sheet
for the frequency converter used.
• Ramp-up and ramp-down time must be at least 5-10 seconds.
5.4.7 Consequences
• When operating the product via a frequency converter, please
be aware of these possible consequences:
• The locked-rotor torque will be lower. How much lower will
depend on the frequency converter type. See the installation
and operating instructions for the frequency converter used for
information on the locked-rotor torque available.
• The working condition of bearings and shaft seal may be
affected. The possible effect will depend on the application.
The actual effect cannot be predicted.
• The acoustic noise level may increase. See the installation
and operating instructions for the frequency converter for
advice as to how to reduce the acoustic noise.
5.5 Electrical protection
5.5.1 Motor protection
The pumps are provided with the following type of motor
protection:
Standard SRG pumps incorporate three bimetallic PTO thermal
switches (PTO = Protection Thermique á Ouverture). See fig. 11.
Function of thermal switches
The motor is protected against overheating by three thermal
switches connected in series, one switch in each winding.
When the maximum winding temperature is reached, the switch
will open the circuit and stop the motor.
When the windings have cooled to normal temperature, the
switch will close the circuit and the motor can be restarted.
Manual restarting is necessary.
See wiring diagram in fig. 11.
Thermal switches (F6)
• Two conductors (terminals 11 and 12).
• Maximum operating voltage of switch: 250 V.
• Maximum switching current: 2.5 A at cos φ= 1.
• Cutting-out temperature: 150 °C.
Function of PTC sensors (optional)
The motor is protected against overheating by three thermal
sensors connected in series, one in each winding. When
overheated, the motor will stop. Automatic restarting is not
permitted in such cases. This requires a thermistor trigger unit
with a reconnection suppressor in the control circuit of the motor
contactor.
See wiring diagram in fig. 12.
ϑ1, ϑ2, ϑ3: PTC sensors:
• Two conductors (terminals 31 and 32).
• Maximum voltage at the terminals: Umax. = 2.5 V (AC/DC).
• Resistance between terminals 31 and 32:
– at room temperature R = 150 to 750 Ω.
– at cutting-out temperature 266 °F (130 °C) R ≥4000 Ω.
Product type
Maximum
repetitive peak
voltage [V]
Maximum dU/
dt [V/μs]
SRG.xx.30
SRG.35.50 1500 15000
SRG.xx.xx 1000 3000
For transmission tests at terminals 31 and 32, the
test voltage must not exceed 2.5 V (AC/DC).
Use an ohmmeter for the test.

11
English (US)
5.5.2 Gearbox protection
The gearbox is monitored for the ingress of water by a leak
sensor incorporated in the gearbox.
If the monitoring function is required, the leak sensor must be
connected to a Grundfos relay.
For a longer distance, use an additional, screened cable. An
external alarm indicator, if any, must be connected to the
potential-free outputs, terminals 1 and 3 or 4, respectively.
Maximum load: 250 V, 5 A.
When the Grundfos leakage relay is connected, a current of up to
10 mA will flow through the leak sensor (terminals 5 and 7 in fig.
13 connected to wires 21 and 22). If water penetrates into the oil
chamber, the relay will trigger an alarm signal and/or switch off
the motor.
See wiring diagram in fig. 11 or 12.
Leak sensor
• Two conductors (terminals 21 and 22).
• Maximum operating voltage: Approx. 12 V.
• Maximum current: 1 to 10 mA.
5.5.3 Overload relays
The motor must be protected against overload via a thermal delay
relay according to local regulations. The relay must be adjusted
to the rated current stated on the nameplate.
5.6 Protection against electro-chemical corrosion
Two different metals or alloys cause electro-chemical corrosion if
they are connected by an electrolyte. This applies if more than
one pump is installed in the same tank. We recommend the
following additional protection:
• galvanic separation of the earth conductor from the neutral
conductor
• galvanic separation of the mains supply by means of an
isolation transformer
• anode kit.
The earth conductor must be separated in such a way as to
ensure that no direct current can flow through it. It must still
function as a protective conductor. This can be achieved with a
limiting unit (polarization cell or anti-parallel diode) or an isolation
transformer.
Fig. 13 Protection from electro-chemical corrosion
The cable between the relay and the pump must not
be longer than 164 ft (50 m).
DANGER
Electric shock
Death or serious personal injury
- When adjusting the relay, beware of electric
voltage.
Do not check the leak sensor with an ohmmeter or
other measuring instruments. The leak sensor is an
electronic component.
TM02 9480 2704
Pos. Designation
1 Limiting unit
2 Earth conductor
3 Isolation transformer
When using an isolation transformer, the ratio
between starting current and rated current (IA/IN)
must not be altered.
L1
L2
L3
N
PE
1
3
2
2

English (US)
12
6. Starting-up the product
Check the oil level in the gearbox before starting up the pump.
The oil must fill up between 50 and 75 % of the gearbox.
If required, fill oil into the gearbox through the oil filling hole (2 in
fig. 14). For oil quality and quantity, see section 8.3 Oil.
If the pump has been in stock for a period before start-up, see
section 8.2 Service chart.
Fig. 14 Oil check and oil filling
Checks before start-up
1. Check that the impeller is rotating in the correct direction. See
section 5.4.3 Direction of rotation.
2. Make sure that the pump is completely submerged in the
liquid.
3. Make sure that there are no solid objects in the tank.
7. Product introduction
Grundfos recirculation pumps, type SRG, are designed for
transfer of liquids of low to medium viscosity from one tank to
another.
Fig. 15 SRG pump
7.1 Applications
Grundfos SRG recirculation pumps are used for the pumping of
return sludge in sewage treatment plants and for other pump
applications involving a high flow rate and low head. The pumps
are designed for continuous operation (S1).
In order not to overload the pumps and expose them to corrosion,
the following limitations must be observed.
CAUTION
Pressurized system
Minor or moderate personal injury
- As pressure may have built up in the oil chamber,
do not remove the oil level bolt until the pressure
has been fully relieved.
TM02 9479 2704
The pump must always be submerged during
operation.
Make sure that no persons can fall into the tank.
13
2
TM03 0374 3308
Pos. Description
4 Pump rack
7Motor
8 Gearbox
10 Impeller
22 Hydraulic inlet
Liquid temperature 41 to 104 °F (5 to 40 °C)
pH value 4-10
Maximum dry solids content 1.5 %
Maximum dynamic viscosity 500 cSt (mPas)
Maximum density 66.2 lb/ft3 (1060 kg/m3)
Chloride content ≤200 ppm (mg/l)
(stainless steel 304 (1.4301))
22 4710
8

13
English (US)
7.2 Identification
7.2.1 Type key
Example SRG 11. 12. 524. 08. 6. 0H.
Type range
SRG: Submersible recirculation pump with gearbox
Motor output power, P2
Code from type designation / 10 [hp]
11: 1.1 hp
Impeller diameter [in]
12: 12 inches
Impeller speed [RPM]
524: 524 RPM
Impeller blade pitch [°]
08: 8 °
Explosion protection
[ ]: Non-explosion-proof
Frequency
6: 60 Hz
Voltage and starting method
0H: 3 x 460 V, Star
1H: 3 x 460 V, Delta
0Z: Special, DOL
Generation
[ ]: First generation
A: Second generation
B: Third generation
Z: Custom-built products

English (US)
14
7.2.2 Nameplate
Fig. 16 Nameplate
The nameplate is located on the motor housing. The details on
the nameplate are required for ordering of spare parts.
Fix the additional nameplate supplied with the pump in a visible
position at the installation site.
8. Servicing the product
Before starting any work on a pump used in liquids which could
constitute a hazard to health, carry out thorough cleaning/venting
of the pump, tank, etc. according to local regulations.
Always replace damaged parts by new approved parts. Do not
recondition motor parts by machining, retapping, welding, etc.
8.1 Contaminated pump
If a pump has been used for a liquid which is injurious to health or
toxic, the pump will be classified as contaminated.
If you request Grundfos to service the product, contact Grundfos
with details about the pumped liquid before returning the product.
Otherwise Grundfos can refuse to accept the product for service.
Any application for service must include details about the pumped
liquid.
The product must be cleaned in the best possible way before it is
returned.
Costs of returning the product are to be paid by the customer.
TM07 1505 1019
Pos. Description
1 Type designation
2 Product number
3 Liquid temperature range
4 Production site
5 Enclosure class according to IEC
6 Impeller diameter
7 Insulation class
8 Rated voltage
9 Rated speed (impeller)
10 Weight
11 Starting current
12 Frequency
13 Safety factor
14 Number of poles
15 Rated current
16 Power factor
17 Motor power P1/P2
18 Production code
19 Maximum installation depth
15 111214 13
123 45 6
18
17
16
19
8
9
10
7
Before starting work on the pump,
– make sure that the fuses have been removed or
the mains switch has been switched off
– make sure that the power supply cannot be
accidentally switched on
– make sure all rotating parts have stopped
moving.
CAUTION
Biological hazard
Minor or moderate personal injury
- Flush the pump thoroughly with clean water and
rinse the pump parts in water after dismantling.

15
English (US)
8.2 Service chart
Type Service instructions Lubrication Inspection
Electric
motor All
Keep the motor housing clean
(otherwise cooling is affected).
The motor housing may only be
dismantled by Grundfos.
The roller bearings are
maintenance-free. They must be
replaced if they get noisy.
Power supply
cable All
Check the power supply cable
twice a year for surface damage,
strain, kinks, etc.
If damaged, the cable must be
replaced by Grundfos.
Gearbox All
In case of wear, replace lip seal
and wear ring.
If the oil contains water, replace the
shaft seal.
Change the oil whenever it
contains water or is contaminated.
Change the oil at least every two
years.
If refilling is required, see section
8.3 Oil.
If the shaft seal housing is not
monitored for the ingress of water,
we recommend that you make
inspections every 6 months.
Impeller All
Check the impeller regularly for
wear and tear. Remove any
material wound round the impeller,
such as ropes, threads, etc. which
may cause uneven running and
oscillation of the installation. In
case of strong turbulence, cleaning
is absolutely necessary.
Winch All
Spray the winch with a protective
coating of oil at regular intervals to
prevent corrosion.
The gear teeth and the bearing
bushes must be lubricated twice a
year with an all-purpose grease.
Lifting wire All Regular oiling or greasing
increases the life of the wire.
Check the wire regularly and
always before using the winch.
Replace the wire, if required.
Bolts All Always check that all bolts in the
pump rack are properly tightened.
When tightening the bolts, renew
the threadlocker if necessary.

English (US)
16
8.3 Oil
8.3.1 Oil quality
Gear oil designation according to ISO VG 68.
8.3.2 Oil quantity
8.4 Changing the oil
Place the pump in a horizontal position on supports and place a
pan underneath to collect the oil.
1. Remove the bolt (2). See fig. 17.
2. Loosen and remove the oil drain bolt (1), and allow the oil to
drain from the chamber into a glass. Leave the oil in the glass
for approx. 10 minutes and check if it contains water. If the oil
contains water, the shaft seal must be replaced.
3. Clean and refit the oil drain bolt (1).
4. Fill oil into the oil chamber through the filling hole (2). Quantity
according to section 8.3.2 Oil quantity.
5. Refit the bolt (2).
Fig. 17 Position of oil drain and oil filling bolts
Type Gearbox
[fluid oz (l)]
SRG.11.12.524.08
40.6 (1.2)
SRG.15.12.628.08
SRG.20.12.720.08
SRG.26.12.805.08
SRG.30.12.883.08
SRG.40.12.513.25
SRG.55.12.607.25
SRG.75.12.722.25
SRG.95.12.805.25
SRG.48.20.254.27
SRG.68.20.299.27
84.5 (2.5)
SRG.95.20.363.27
SRG.135.20.406.27
SRG.95.32.260.11
SRG.160.32.308.11
SRG.175.32.355.11
SRG.200.32.334.11
135 (4.0)SRG.270.32.374.11
SRG.320.32.418.11
CAUTION
Pressurised system
Minor or moderate personal injury
- As pressure may have built up in the oil chamber,
do not remove the oil level bolt until the pressure
has been fully relieved.
Dispose of used oil in accordance with local
regulations.
TM02 9479 2704
13
2

17
English (US)
9. Fault finding the product
Before starting work on the pump,
– make sure that the fuses have been removed or
the mains switch has been switched off
– make sure that the power supply cannot be
accidentally switched on
– make sure all rotating parts have stopped
moving.
Fault Cause Remedy
1. The pump does not start. a) No power supply or supply failure. Call an electrician.
b) The power supply cable is faulty. Call an electrician.
c) The control system is faulty. Call an electrician.
d) The impeller cannot rotate freely. Clean the impeller and check manually that it can
rotate freely.
e) The stator windings are faulty. Contact Grundfos.
f) The motor has cut out because of
overheating.
Wait until the motor has cooled and attempt to restart
the pump.
g) Different phase voltages. Call an electrician.
h) The overload relay is set too low or is faulty. Check the overload relay. Set the relay to the rated
current. See section 5.5.3 Overload relays.
i) The leak sensor has cut out the pump. Contact Grundfos.
j) There is humidity in the motor. Contact Grundfos.
2. Pump starts, but stops
immediately.
a) The stator windings are faulty. Contact Grundfos.
b) Different phase voltages. Call an electrician.
c) The overload relay is set too low or is faulty. Check the overload relay. Set the relay to the rated
current. See section 5.5.3 Overload relays.
d) The leak sensor has cut out the pump. Contact Grundfos.
e) There is humidity in the motor. Contact Grundfos.
3. No liquid or inadequate
quantity is pumped even if
the motor is running.
a) The impeller rotates in the wrong direction. Interchange two phases of the mains supply.
b) The pump runs on two phases. 1. Check the electrical connections.
2. Replace faulty fuses.
3. Call an electrician.
c) The internal parts are worn. Contact Grundfos.
d) The impeller is dirty or damaged. Clean the impeller and inspect for any wear.
4. Pump runs unevenly and
makes noise.
a) The internal parts are worn. Contact Grundfos.
b) The impeller is dirty or damaged. Clean the impeller and inspect for any wear.
c) The motor or gearbox roller bearings are
faulty.
Contact Grundfos.
d) Oscillations caused by the installation
(resonance).
Check installation design.
5. High current and power
consumption.
a) Wrong voltage supply or supply failure. Call an electrician.
b) The power supply cable is faulty. Call an electrician.
c) The control system is faulty. Call an electrician.
d) The impeller cannot rotate freely. Clean the impeller and check manually that it can
rotate freely.
e) The stator windings are faulty. Contact Grundfos.
f) The pump runs on two phases. 1. Check the electrical connections.
2. Replace faulty fuses.
3. Call an electrician.
g) The internal parts are worn. Contact Grundfos.
h) The motor or gearbox roller bearings are
faulty.
Contact Grundfos.

English (US)
18
10. Technical data
10.1 General technical data
* Other cable lengths are available on request.
10.2 Motor
10.3 Gearbox
10.4 Shaft seals
10.5 Impeller
10.6 Sound pressure level
The sound pressure level of the pump is lower than 70 dB(A).
11. Disposing of the product
This product or parts of it must be disposed of in an
environmentally sound way:
1. Use the public or private waste collection service.
2. If this is not possible, contact the nearest Grundfos company
or service workshop.
The crossed-out wheelie bin symbol on a product
means that it must be disposed of separately from
household waste. When a product marked with this
symbol reaches its end of life, take it to a collection
point designated by the local waste disposal
authorities. The separate collection and recycling of such
products will help protect the environment and human health.
See also end-of-life information at www.grundfos.com/product-
recycling.
Voltage tolerance +/- 10 % of nameplate value
Enclosure class IP68
Insulation class H
Maximum installation depth 66 ft (20 m) below liquid level
Maximum number of starts
per hour 20
Length of power supply cable 33 and 50 ft (10 and 15 m)
(standard)*
Wire length on all winches 33 ft (10 m) (standard)
Maximum installation depth 66 ft (20 m) below the liquid
surface
Maximum number of starts
per hour 20
Enclosure class IP68
Insulation class H
Material, motor housing Cast iron, ASTM 48 class 35B
(EN-GJL-250)
Type Planetary gearbox
Gears Hardened and ground steel
Monitoring of shaft seal Leak sensor incorporated in
gearbox
Drive-end bearings Two tapered roller bearings
Material, gear casing Cast iron, ASTM 48 class 35B
(EN-GJL-250)
SRG Two lip seals and one mechanical shaft seal made of
tungsten carbide/tungsten carbide or SiC/SiC
Number of blades 3
Nominal diameter
SRG.xx.12.xxx
SRG.xx.20.xxx
SRG.xx.32.xxx
12 in (300 mm)
20 in (500 mm)
32 in (800 mm)
Construction Self-cleaning, optimum flow design
Material Stainless steel CF8M or 316SS (1.4408
or 1.4581)

Appendix
19
Appendix
1. Dimensions and weights
1.1 SRG Pump
1.2 60 Hz
TM02 9450 2604
Pump type P2
[hp (kW)]
A
[in (mm)]
B
[in (mm)]
C
[in (mm)]
D
[in (mm)]
E
[in (mm])
F
[in (mm)]
G
[in (mm)]
H
[in (mm)]
Weight
[lb. (kg)]
SRG.11.12.524. 1.1 (0.8)
33.4
(848)
23.7
(602)
29.0
(736)
22.5
(571) 2.59 (66) 17.5
(445)
8.66
(220) 0.6 (15) 240 (109)
SRG.15.12.628. 1.5 (1.1)
SRG.20.12.720. 2.0 (1.5)
SRG.26.12.805. 2.6 (1.9)
SRG.30.12.883. 3.0 (2.2)
SRG.40.12.513. 4.0 (3.0) 33.4
(848)
23.7
(602)
29.0
(736)
22.5
(571) 2.59 (66) 17.5
(445)
8.66
(220) 0.6 (15) 247 (112)
SRG.55.12.607. 5.5 (4.0)
SRG.75.12.722. 7.5 (5.5) 33.4
(848)
23.7
(602)
29.0
(736)
22.5
(571) 2.59 (66) 17.5
(445)
8.66
(220) 0.6 (15) 265 (120)
SRG.95.12.805. 9.5 (7.0)
SRG.48.20.254. 4.8 (3.5) 35.8
(910)
32.9
(835)
29.8
(757)
32.4
(824) 2.59 (66) 26.4
(670)
9.06
(230) 0.98 (25) 331 (150)
SRG.68.20.299. 6.8 (5.0) 44.1
(1119)
33.7
(855)
39.2
(996)
32.4
(824) 2.59 (66) 26.4
(670)
9.06
(230) 0.98 (25) 529 (240)
SRG.95.20.363. 9.5 (7.0)
SRG.135.20.406. 13.5 (10.0) 44.1
(1119)
33.7
(855)
39.2
(996)
32.4
(824) 2.59 (66) 26.4
(670)
9.06
(230) 0.98 (25) 564 (256)
SRG.95.32.260. 9.5 (7.0) 44.4
(1129)
48.7
(1237)
39.6
(1006)
48.2
(1225) 2.59 (66) 40.0
(1015)
10.5
(267) 0.98 (25) 736 (334)
SRG.160.32.308. 16.0 (12.0) 44.4
(1129)
48.7
(1237)
39.6
(1006)
48.2
(1225) 2.59 (66) 40.0
(1015)
10.5
(267) 0.98 (25) 772 (350)
SRG.175.32.355. 17.5 (13.0)
SRG.200.32.334. 20.0 (15.0)
46.5
(1181)
49.5
(1257)
41.7
(1058)
48.2
(1225) 2.59 (66) 40.0
(1015)
10.5
(267) 0.98 (25) 948 (430)SRG.270.32.374. 27.0 (20.0)
SRG.320.32.418. 32.0 (24.0)

20