Grundfos CR 95 User manual

CR, CRN 95-255
Installation and operating instructions
GRUNDFOS INSTRUCTIONS
Other languages
http://net.grundfos.com/qr/i/99078486

English (GB)
2
English (GB) Installation and operating instructions
Original installation and operating instructions
These installation and operating instructions
describe Grundfos CR, CRN 95 to 255.
Sections 1-4 give the information necessary to be
able to unpack, install and start up the product in a
safe way.
Sections 5-10 give important information about the
product, as well as information on service, fault
finding and disposal of the product.
CONTENTS
Page
1. General information
1.1 Hazard statements
The symbols and hazard statements below may
appear in Grundfos installation and operating
instructions, safety instructions and service
instructions.
The hazard statements are structured in the
following way:
1.2 Notes
The symbols and notes below may appear in
Grundfos installation and operating instructions,
safety instructions and service instructions.
1. General information 2
1.1 Hazard statements 2
1.2 Notes 2
1.3 Safety information for the motor 3
2. Receiving the product 3
2.1 Transporting the product 3
2.2 Unpacking the product 3
2.3 Inspecting the product 3
2.4 Lifting the product 3
3. Installing the product 7
3.1 Mechanical installation 7
3.2 Electrical connection 12
4. Starting up the product 12
4.1 Startup procedure 13
4.2 Shaft seal run-in 14
5. Product introduction 14
5.1 Identification 14
5.2 Intended use of the product 15
5.3 Operating the product 16
6. Servicing the product 16
6.1 Contaminated pumps 17
6.2 Service documentation 18
6.3 Maintaining the product 18
7. Taking the product out of operation 19
7.1 Frost protection 19
7.2 Taking the product permanently out of
operation 19
8. Fault finding the product 20
9. Technical data 22
9.1 Operating conditions 22
9.2 Dimensions and weights 23
9.3 Electrical data 23
9.4 Sound pressure level 23
10. Disposing of the product 23
Read this document before installing the
product. Installation and operation must
comply with local regulations and accepted
codes of good practice.
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.
Observe these instructions for explosion-
proof products.
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.
Tips and advice that make the work easier.

English (GB)
3
1.3 Safety information for the motor
2. Receiving the product
2.1 Transporting the product
2.2 Unpacking the product
2.3 Inspecting the product
Before you install the product, do the following:
1. Check that the product is as ordered.
2. Check that no visible parts have been damaged.
If parts are damaged or missing, contact your local
Grundfos sales company.
2.4 Lifting the product
The following sections describe various lifting
situations and the lifting instructions which must be
followed in order to obtain safe lifting of the product:
• Position of lifting brackets: See section
2.4.1 Position of lifting brackets.
• Lifting the motor with or without the motor stool.
See section 2.4.2 Lifting the motor off the pump.
• Horizontal lift: See section 2.4.4 Lifting the
product in horizontal position.
• Raising or laying down the product: See section
2.4.5 Raising or laying down the product.
• Vertical lift: See section 2.4.6 Lifting the product
in vertical position.
• Lifting of CRE pumps: See section 2.4.3 Lifting of
pumps fitted with MGE motors.
2.4.1 Position of lifting brackets
Fig. 1 Position of lifting brackets
Read the safety information specific for the
motor in the instructions for the motor
which are supplied with the pump.
WARNING
Falling objects
Death or serious personal injury
- Keep the product in a stable and fixed
position during transportation.
- Wear personal protective equipment.
WARNING
Falling objects
Death or serious personal injury
- Keep the product in a stable position
during unpacking.
- Wear personal protective equipment.
WARNING
Falling objects
Death or serious personal injury
- Do not use the motor eyebolts to lift the
entire pump if the pump is fitted with a
motor of another make than Grundfos
MG and MGE.
- Follow the lifting instructions.
- Use lifting equipment which is approved
for the weight of the product.
- Persons must keep a safe distance to
the product during lifting operations.
- Wear personal protective equipment.
TM07 2254 3218
A: Incorrect position of lifting brackets.
B: Correct position of lifting brackets.
AB

English (GB)
4
2.4.2 Lifting the motor off the pump
Fig. 2 Lifting the motor
2.4.3 Lifting of pumps fitted with MGE motors
Fig. 3 Lifting of pumps fitted with MGE motors
TM07 2255 3218
A: Incorrect lifting of motor with motor stool.
B: Incorrect lifting of motor without motor stool.
C: Correct lifting of motor with motor stool.
D: Correct lifting of motor without motor stool.
CD
AB
When lifting a pump fitted with a motor that
contains an integrated frequency
converter, make sure that the terminal box
does not come into contact with the lifting
equipment. See fig. 3
TM07 2290 3218
A: Incorrect lifting of pump with MGE motor.
B: Correct lifting of pump with MGE motor.
stop
stop
AB

English (GB)
5
2.4.4 Lifting the product in horizontal position
Fig. 4 Horizontal lift of pumps with 5.5 kW
Grundfos MG and MGE* motors
* See also section 2.4.3 Lifting of pumps fitted with
MGE motors
Fig. 5 Horizontal lift of pumps with 7.5 - 22 kW
Grundfos MG and MGE* motors
* See also section 2.4.3 Lifting of pumps fitted with
MGE motors
Fig. 6 Horizontal lift of pumps with 5.5 - 200
KW motors of other makes than
Grundfos MG and MGE
Fig. 7 Horizontal lift of pumps without motor
2.4.5 Raising or laying down the product
Fig. 8 Raising or laying down pumps with 5.5
kW Grundfos MG and MGE* motors
* See also section 2.4.3 Lifting of pumps fitted with
MGE motors
Fig. 9 Raising or laying down pumps with 7.5 -
22 kW Grundfos MG and MGE* motors
* See also section 2.4.3 Lifting of pumps fitted with
MGE motors
TM06 8773 1117TM06 8774 1117TM06 8627 0917
TM06 8775 1117
TM06 8744 1117TM06 8743 1117

English (GB)
6
Fig. 10 Raising or laying down pumps with 5.5 -
200 KW motors of other makes than
Grundfos MG and MGE
Fig. 11 Raising or laying down pumps without
motor
2.4.6 Lifting the product in vertical position
Fig. 12 Vertical lift of pumps with 5.5 kW
Grundfos MG and MGE motors
Fig. 13 Vertical lift of pumps with 7.5 - 22 kW
Grundfos MG and MGE motors
Fig. 14 Vertical lift of pumps with 5.5 - 200 KW
motors of other makes than Grundfos
MG and MGE
Fig. 15 Vertical lift of pumps without motor
TM06 8742 1117TM06 8745 1117TM06 8597 1117
TM06 8598 1117TM06 8599 1117TM06 8162 1117

English (GB)
7
3. Installing the product
3.1 Mechanical installation
3.1.1 Lifting the product
For lifting instructions, see section 2.4 Lifting the
product.
3.1.2 Installation guidelines
The pump must be secured to a horizontal, plane
and solid foundation with bolts through the holes in
the base plate. When installing the pump, be aware
of the information below in order to avoid damaging
the pump.
DANGER
Falling objects
Death or serious personal injury
- Fasten the pump securely to a solid and
even foundation according to the
specifications stated in the installation
and operating instructions.
WARNING
Contamination when pumping drinking
water
Death or serious personal injury
- Before the pump is used for supplying
drinking water, flush the pump
thoroughly with clean water.
- Do not use the pump for drinking water
if the internal parts have been in contact
with particles or substances not suitable
for water intended for human
consumption.
WARNING
Falling objects
Death or serious personal injury
- Do not use the motor eyebolts to lift the
entire pump if the pump is fitted with a
motor of another make than Grundfos
MG and MGE.
- Follow the lifting instructions.
- Use lifting equipment which is approved
for the weight of the product.
- Persons must keep a safe distance to
the product during lifting operations.
- Wear personal protective equipment.

English (GB)
8
Illustration Information
1
TM06 9134 1617
Arrows on the pump base plate show the direction of flow of liquid
through the pump.
2
TM06 9156 1717
These dimensions are stated on page 26:
• port-to-port lengths
• dimensions of the base plate
• pipe connections
• diameter and position of anchor bolts.
3
TM07 0783 0218
The pump can be installed vertically and horizontally. If you wish to
install a pump horizontally, it must be ordered with support brackets
fitted from factory and a foot-mounted motor.
3a
TM05 7705 1013
Additional support. As the centre of gravity of the pump is relatively
high, we recommend that pumps installed on ships, in areas with risk
of earth quake or in systems which can be moved, are equipped with
an additional support bracket. You can fit the bracket from the motor
stool to the bulkhead of the ship, a rigid wall in a building or to a rigid
part.
4
TM02 0116 3800
To minimise possible noise from the pump, we recommend that you fit
expansion joints on either side of the pump.
Build a foundation and carry out mechanical installation as described
in section 3.1.3 Foundation.
Fit isolating valves on either side of the pump to avoid draining the
system if the pump needs to be removed for cleaning, repair or
replacement.
Always protect the pump against backflow by means of a non-return
valve.
5
TM02 0114 3800
Install the pipes so that air pockets do not occur.
6
TM02 0115 3800
Fit a vacuum valve close to the pump if the installation has one of
these characteristics:
• The outlet pipe slopes downwards away from the pump.
• There is a risk of siphon effect.
• Protection against backflow of unclean liquids is needed.

English (GB)
9
3.1.3 Foundation
We recommend that you install the pump on a
concrete foundation which is heavy enough to
provide permanent and rigid support for the entire
pump. The foundation must be capable of absorbing
any vibration, normal strain or shock. The concrete
foundation must have an absolutely level and even
surface.
Place the pump on the foundation, and fasten it. The
base plate must be supported on the whole area.
The following instruction applies when mounting the
pump in both vertical and horizontal position. Place
the pump on the foundation, and fasten it. See fig.
16.
Fig. 16 Correct installation
Fig. 17 Foundation, vertical mounting
The recommended length and width of the
foundation are shown in fig. 17. Note that for pumps
with motor size below or equal to 30 kW, the length
and width of the foundation must be 200 mm larger
than the base plate.
For pumps with motor size equal to 37 kW or above,
the length and width must always be 1.5 x 1.5 (Lf x
Wf) m.
Fig. 18 Foundation, horizontal mounting
The foundation length and width must always be 200
mm larger than the length and width of the pump.
See fig. 18.
The mass of the foundation must be at least 1.5
times the total mass of the pump. The minimum
height of the foundation (hf) can then be calculated:
The density (δ) of concrete is usually taken as 2200
kg/m3.
In installations where noiseless operation is
particularly important, we recommend that you use a
foundation with a mass up to 5 times that of the
pump.
The foundation must be provided with anchor bolts
for fixing the base plate. See fig. 19.
Fig. 19 Bolt in foundation
When the anchor bolts are in position, place the
pump on the foundation. Then align the base plate
using shims, if necessary, so that it is completely
horizontal. See fig. 20.
Fig. 20 Alignment with shims
WARNING
Falling objects
Death or serious personal injury
- Keep the product in a stable and fixed
position before installing it.
- Make sure that the foundation is
suitable for the weight of the product.
TM04 0342 0608TM06 8985 1517
f
h
Lf
L
f
Wf
TM07 0574 0318
hf = Mpump × 1.5
Lf × Wf × δconcrete
TM03 4589 2206TM04 0362 0608
L
hW
f
Lf
ff
Shims

English (GB)
10
3.1.4 Vibration dampening
Elimination of noise and vibrations is best achieved
by means of a concrete foundation, vibration
dampers and expansion joints.
If you use vibration dampers, install them under the
foundation. For pumps with motor size below or
equal to 30 kW, you can use vibration dampers as
shown in fig. 21.
For pumps with motor size equal to 37 kW or above,
you can use a Sylomer®plate as shown in fig. 22.
Fig. 21 Pump on vibration dampers
Fig. 22 Pump on Sylomer®plate
3.1.5 Outdoor installation
When the pump is installed outdoors, we recommend
that you provide the motor with a rain cover. We also
recommend that you open one of the drain holes in
the motor flange.
3.1.6 Tightening torques
The tables show the recommended torques for base
plate anchor bolts and flange bolts.
The bolt quality must be minimum class 5.8 except
for CR, CRN 95 with optional small base plate which
must be minimum class 8.8.
TM06 7999 4316TM06 8000 4316
Expansion joints
Vibration dampers
Sylomer®plate
Expansion joints
WARNING
Flange gasket blowout
Death or serious personal injury
- Tighten flange bolts according to the
specified torque values.
WARNING
Falling objects
Death or serious personal injury
- Tighten the base plate anchor bolts
according to the specified torque
values.
CR, CRN
Base plate anchor bolts
Bolt size Torque [Nm]
95 with
optional
small base
plate
M12
(∅14 free hole) 65
95 M16
(∅18 free hole) 100
125-155 M20
(∅22 free hole) 190
185-255 M24
(∅26 free hole) 130
CR, CRN
Flange bolts
(DIN/EN, JIS, ANSI)
Bolt size Torque [Nm]
95 M16 30
M20 90
125-155 M20 90
M24 230
185-255
M20 90
M24 230
M27 300

English (GB)
11
3.1.7 Flange forces and torques
If not all loads reach the maximum permissible value
stated in the tables below, one of these values may
exceed the normal limit. Contact Grundfos for further
information.
Fig. 23 Flange forces and torques
The following tables represent the values that apply
according to the material quality.
Force limits for CR pumps
Force limits for CRN pumps
Torque limits for CR pumps
Torque limits for CRN pumps
TM04 0346 2013
Y-direction: Inlet or outlet
Z-direction: Direction of chamber stack
X-direction: 90 ° from inlet or outlet
Flange, DN
[mm] CR Force, Y-direction [N]
Force, Z-direction
[N]
Force, X-direction
[N]
100 95 1256 1013 1125
150 125 and 155 1875 1519 1688
200 185, 215 and 255 2513 2025 2250
Flange, DN
[mm] CRN Force, Y-direction [N]
Force, Z-direction
[N]
Force, X-direction
[N]
100 95 2513 2025 2250
150 125 and 155 3750 3038 3375
200 185, 215 and 255 5025 4050 4500
Flange, DN
[mm] CR Torque, Y-direction [Nm]
Torque, Z-direction
[Nm]
Torque, X-direction
[Nm]
100 95 375 475 625
150 125 and 155 625 775 1000
200 185, 215 and 255 900 1075 1375
Flange, DN
[mm] CRN Torque, Y-direction [Nm]
Torque, Z-direction
[Nm]
Torque, X-direction
[Nm]
100 95 750 950 1250
150 125 and 155 1250 1550 2000
200 185, 215 and 255 1800 2150 2750

English (GB)
12
3.2 Electrical connection
The electrical connection must be carried out by an
authorised electrician in accordance with local
regulations.
4. Starting up the product
Fig. 24 Vent valve, standard and an optional
solution with hose connection
Follow the instructions for the motor when
carrying out the electrical connections.
WARNING
Electric shock
Death or serious personal injury
- Before starting any work on the product,
make sure that the power supply has
been switched off and that it cannot be
accidentally switched on.
- Connect the pump to an external main
switch close to the pump and to a
motor-protective circuit breaker or a
CUE frequency converter. Make sure
you can lock the main switch in OFF
position (isolated). Type and
requirements as specified in EN 60204-
1, 5.3.2.
WARNING
Corrosive liquids
Death or serious personal injury
- Wear personal protective equipment.
WARNING
Toxic liquids
Death or serious personal injury
- Wear personal protective equipment.
CAUTION
Hot or cold liquid
Minor or moderate personal injury
- Wear personal protective equipment.
- Pay attention to the direction of the vent
hole when you fill the pump with liquid
and vent it.
- Make sure that no persons are hurt by
the escaping liquid.
Fill the pump with liquid and vent it before
you start the pump.
Pay attention to the direction of the vent
hole during liquid filling and venting. Make
sure that the escaping liquid does not
cause damage to the motor or other
components.
TM05 1160 0611 - TM05 8098 1913

English (GB)
13
4.1 Startup procedure
1. Close the isolating valve on the outlet side of the
pump and open the isolating valve on the inlet
side.
2. Remove the priming plug from the pump head
and slowly fill the pump with liquid. Replace the
priming plug and tighten securely.
3. See the correct direction of rotation of the pump
on the motor fan cover.
4. Start the pump and check the direction of
rotation.
5. Vent the pump by means of the vent valve in the
pump head. At the same time, open the outlet
isolating valve a little.
6. Continue to vent the pump. At the same time,
open the outlet isolating valve a little more.
7. Close the vent valve when a steady stream of
liquid runs out of it.
8. Completely open the outlet isolating valve.
TM06 6882 2516TM06 6883 2516TM06 6884 2516TM06 6885 2516
TM06 6886 2516TM06 6887 2516TM06 6888 2516TM07 2337 3118

English (GB)
14
4.2 Shaft seal run-in
The seal faces are lubricated by the pumped liquid,
meaning that there may be a certain amount of
leakage from the shaft seal.
When you start the pump for the first time, or when
you install a new shaft seal, a certain run-in period is
required before the leakage is reduced to an
acceptable level. The time required for this depends
on the operating conditions, that is every time the
operating conditions change, a new run-in period will
be started.
Under normal conditions, the leaking liquid will
evaporate. As a result, no leakage will be detected.
5. Product introduction
5.1 Identification
5.1.1 Nameplate
The information on the pump nameplate are
described below.
Fig. 25 Nameplate
WARNING
Corrosive liquids
Death or serious personal injury
- Wear personal protective equipment.
WARNING
Toxic liquids
Death or serious personal injury
- Wear personal protective equipment.
CAUTION
Hot or cold liquid
Minor or moderate personal injury
- Wear personal protective equipment.
Make sure that a leakage does not cause
damage to the equipment.
TM07 2185 3518
Pos. Description
1 Model
2 Product number
3 Serial number
4 Type designation
5 Frequency
6 Rated speed
7 Weight excluding motor
8 Power at rated flow rate and rated speed
9 Rated flow rate
10
Direction of rotation
CCW: Counterclockwise
CW: Clockwise
11 Head at rated flow rate/Maximum head
12 Minimum efficiency index
13 Hydraulic efficiency at rated flow rate
14
Maximum system pressure/maximum
liquid temperature
Note: This field may have two sets of
data, separated by a semicolon.
15
Technical file number (stated if the pump
is ATEX classified) or customer-specific
information
16 Country of origin
17 Approval marks
18 Production code
19 ATEX category (stated if the pump is
ATEX classified)
DK-8850 Bjerringbro,Denmark
Model-PN-SN
Type
Hz
pmax/tmax
Tech file No
P code:
bar/°C
rpm ex.motor kg
/hm3
kWP2
H/H max m 0(,
ȘS 
1
4
5 6 7
8910
11 12 13
14
15 16
17 18 19
23

English (GB)
15
5.1.2 Type key
5.2 Intended use of the product
Only use the CR, CRN pumps according to the
specifications stated in the installation and operating
instructions.
5.2.1 Applications
CR, CRN pumps are suitable for industrial
applications such as:
• water supply
• cooling
• heating
• pressure boosting
• water treatment
• liquid transfer of cold or hot clean liquids.
5.2.2 Pumped liquids
CR, CRN pumps are suitable for pumping liquids
which are thin, clean, non-flammable, non-
combustible or non-explosive liquids, not containing
solid particles or fibres.
When pumping liquids with a density and/or viscosity
higher than that of water, use motors with
correspondingly higher outputs, if required.
Whether a pump is suitable for a particular liquid
depends on a number of factors of which the most
important are chloride content, pH value,
temperature, content of chemicals and oils. Please
consult Grundfos for information about which pump
types are suitable for a specific liquid.
Example CR 95- 2 1- X- X- X- X- XXXX
Type range: CR, CRN
Rated flow rate in m3/h
Number of stages
Number of impellers with reduced diameter
Code for pump version
Code for pipe connection
Code for materials
Code for rubber pump parts
Code for shaft seal
DANGER
Fire and explosion
Death or serious personal injury
- Do not use the pump for flammable,
combustible or explosive liquids.
WARNING
Chemical attack and leakage
Death or serious personal injury
- Do not use the pump for liquids which
can attack the pump materials
chemically.
- Contact Grundfos if in doubt.
WARNING
Corrosive liquids
Death or serious personal injury
- Wear personal protective equipment.
WARNING
Toxic liquids
Death or serious personal injury
- Wear personal protective equipment.
CAUTION
Hot or cold liquid
Minor or moderate personal injury
- Wear personal protective equipment.

English (GB)
16
5.3 Operating the product
For operating the product safely, observe the
following hazard statements.
See sound pressure levels on page 27.
6. Servicing the product
For lifting instructions, see section 2.4 Lifting the
product.
WARNING
Contamination when pumping drinking
water
Death or serious personal injury
- Do not use the pump for drinking water
if the internal parts have been in contact
with particles or substances not suitable
for water intended for human
consumption.
WARNING
Airborne noise
Death or serious personal injury
- Wear personal protective equipment.
WARNING
Too high pressure and leakage
Death or serious personal injury
- Do not run the pump against a closed
outlet valve.
WARNING
Intoxication if pumping toxic or
corrosive liquids
Death or serious personal injury
- Pumped liquid which is drained off or
leaks from the pump must be collected
for safe disposal.
CAUTION
Hot or cold surface
Minor or moderate personal injury
- Make sure that no one can accidentally
come into contact with hot or cold
surfaces.
DANGER
Electric shock
Death or serious personal injury
- Before starting any work on the product,
make sure that the power supply has
been switched off and that it cannot be
accidentally switched on.
DANGER
Electric shock
Death or serious personal injury
- Close the inlet and outlet valves to
eliminate flow through the pump which
can cause the pump to act as a turbine
and consequently generate a current in
the motor.
WARNING
Electric shock
Death or serious personal injury
- Connect the pump to the same
protective-earth (PE) potential as the
motor if both motor bearings are
replaced by ceramic bearings.
WARNING
Falling objects
Death or serious personal injury
- Do not use the motor eyebolts to lift the
entire pump if the pump is fitted with a
motor of another make than Grundfos
MG and MGE.
- Follow the lifting instructions.
- Use lifting equipment which is approved
for the weight of the product.
- Persons must keep a safe distance to
the product during lifting operations.
- Wear personal protective equipment.

English (GB)
17
We recommend that you repair pumps with motors of
7.5 kW and up at the installation site. Necessary
lifting equipment must be available.
6.1 Contaminated pumps
The product will be classified as contaminated if it
has been used for a liquid which is injurious to health
or toxic.
If you request Grundfos to service the product,
contact Grundfos with details about the liquid before
returning the product for service. Otherwise,
Grundfos can refuse to accept the product for
service.
Any application for service must include details
about the liquid.
Clean the product in the best possible way before
you return it.
Costs of returning the product are to be paid by the
customer.
WARNING
Falling objects
Death or serious personal injury
- Keep the product in a stable and fixed
position when working on it.
WARNING
Contamination when pumping drinking
water
Death or serious personal injury
- Before the pump is used for supplying
drinking water, flush the pump
thoroughly with clean water.
- Do not use the pump for drinking water
if the internal parts have been in contact
with particles or substances not suitable
for water intended for human
consumption.
- Always use original spare parts suitable
for drinking water.
WARNING
Intoxication if pumping toxic or
corrosive liquids
Death or serious personal injury
- Pumped liquid which is drained off or
leaks from the pump must be collected
for safe disposal.
WARNING
Corrosive liquids
Death or serious personal injury
- Wear personal protective equipment.
WARNING
Toxic liquids
Death or serious personal injury
- Wear personal protective equipment.
WARNING
Moving parts
Death or serious personal injury
- Install the coupling guards securely to
the pump with the screws intended for
this purpose.
CAUTION
Hot or cold liquid
Minor or moderate personal injury
- Wear personal protective equipment.
CAUTION
Hot or cold surface
Minor or moderate personal injury
- Make sure that no one can accidentally
come into contact with hot or cold
surfaces.
CAUTION
Biological hazard
Minor or moderate personal injury
- Flush the pump thoroughly with water
and rinse the pump parts in water after
dismantling.

English (GB)
18
6.2 Service documentation
6.2.1 Pump
You can find detailed information about how to
service your product in the service instructions which
can be accessed via the QR code or link below:
Additional service documentation including service
videos are available in Grundfos Product Center >
http://product-selection.grundfos.com/.
6.2.2 Motor
Grundfos MG and MGE motors
Service documentation is available in Grundfos
Product Center > http://product-
selection.grundfos.com/.
Motors of other makes
Contact the motor manufacturer.
6.3 Maintaining the product
For lifting instructions, see section 2.4 Lifting the
product.
6.3.1 Pump
The pump bearings and the shaft seal are
maintenance-free.
6.3.2 Motor
Carry out maintenance as described in the
instructions for the motor which are supplied with the
pump.
Service instructions for CR, CRN 95 to 255
http://net.grundfos.com/qr/i/99233360
DANGER
Electric shock
Death or serious personal injury
- Before starting any work on the product,
make sure that the power supply has
been switched off and that it cannot be
accidentally switched on.
WARNING
Falling objects
Death or serious personal injury
- Do not use the motor eyebolts to lift the
entire pump if the pump is fitted with a
motor of another make than Grundfos
MG and MGE.
- Follow the lifting instructions.
- Use lifting equipment which is approved
for the weight of the product.
- Persons must keep a safe distance to
the product during lifting operations.
- Wear personal protective equipment.
WARNING
Falling objects
Death or serious personal injury
- Keep the product in a stable and fixed
position when working on it.
WARNING
Corrosive liquids
Death or serious personal injury
- Wear personal protective equipment.
WARNING
Toxic liquids
Death or serious personal injury
- Wear personal protective equipment.
CAUTION
Hot or cold liquid
Minor or moderate personal injury
- Wear personal protective equipment.
CAUTION
Hot or cold surface
Minor or moderate personal injury
- Make sure that no one can accidentally
come into contact with hot or cold
surfaces.

English (GB)
19
7. Taking the product out of operation
7.1 Frost protection
Drain pumps which are not being used during
periods of frost to avoid damage.
To drain the pump loosen the vent screw in the pump
head and remove all drain plugs from one side of the
pump base.
Do not tighten the vent screw and replace the drain
plug until the pump is to be used again.
7.2 Taking the product permanently out of
operation
Observe the following if the pump is to be
permanently taken out of operation and removed
from the pipe system.
For lifting instructions, see section 2.4 Lifting the
product.
CAUTION
Hot or cold liquid
Minor or moderate personal injury
- Pay attention to the direction of the vent
hole and drain plug when draining the
pump. Make sure that the escaping
liquid does not cause injury to persons.
- Wear personal protective equipment.
Pay attention to the direction of the vent
hole and drain plug when draining the
pump. Make sure that the escaping liquid
does not cause damage to the motor or
other components.
DANGER
Electric shock
Death or serious personal injury
- Before starting any work on the product,
make sure that the power supply has
been switched off and that it cannot be
accidentally switched on.
WARNING
Falling objects
Death or serious personal injury
- Do not use the motor eyebolts to lift the
entire pump if the pump is fitted with a
motor of another make than Grundfos
MG and MGE.
- Follow the lifting instructions.
- Use lifting equipment which is approved
for the weight of the product.
- Persons must keep a safe distance to
the product during lifting operations.
- Wear personal protective equipment.
WARNING
Falling objects
Death or serious personal injury
- Keep the product in a stable and fixed
position when working on it.
WARNING
Corrosive liquids
Death or serious personal injury
- Wear personal protective equipment.
WARNING
Toxic liquids
Death or serious personal injury
- Wear personal protective equipment.
CAUTION
Hot or cold liquid
Minor or moderate personal injury
- Wear personal protective equipment.
CAUTION
Hot or cold surface
Minor or moderate personal injury
- Make sure that no one can accidentally
come into contact with hot or cold
surfaces.

English (GB)
20
8. Fault finding the product
DANGER
Electric shock
Death or serious personal injury
- Before starting any work on the product,
make sure that the power supply has
been switched off and that it cannot be
accidentally switched on.
WARNING
Corrosive liquids
Death or serious personal injury
- Wear personal protective equipment.
WARNING
Toxic liquids
Death or serious personal injury
- Wear personal protective equipment.
WARNING
Falling objects
Death or serious personal injury
- Keep the product in a stable and fixed
position when working on it.
CAUTION
Hot or cold liquid
Minor or moderate personal injury
- Wear personal protective equipment.
CAUTION
Hot or cold surface
Minor or moderate personal injury
- Make sure that no one can accidentally
come into contact with hot or cold
surfaces.
Fault Cause Remedy
1. The motor does not
run when started.
a) Supply failure. Connect the power supply.
b) The fuses are blown. Replace the fuses.
c) The motor-protective circuit breaker
has tripped.
Reactivate the motor-protective
circuit breaker.
d) The thermal protection has tripped. Reactivate the thermal protection.
e) The main contacts in the motor-
protective circuit breaker are not
making contact or the coil is faulty.
Replace the contacts or the
magnetic coil.
f) The control circuit is defective. Repair the control circuit.
g) The motor is defective. Replace the motor.
2. The motor-protective
circuit breaker trips
immediately when the
power supply is
switched on.
a) One fuse is blown or the automatic
circuit breaker has tripped.
Replace the fuse or cut in the
circuit breaker.
b) The contacts in the motor-protective
circuit breaker are faulty.
Replace the motor-protective circuit
breaker contacts.
c) The cable connection is loose or
faulty.
Fasten or replace the cable
connection.
d) The motor winding is defective. Replace the motor.
e) The pump is mechanically blocked. Remove the mechanical blocking of
the pump.
f) The motor-protective circuit breaker
setting is too low.
Set the motor-protective circuit
breaker correctly.
3. The motor-protective
circuit breaker trips
occasionally.
a) The motor-protective circuit breaker
setting is too low.
Set the motor-protective circuit
breaker correctly.
b) Low voltage at peak times. Ensure a stable power supply.
4. The motor-protective
circuit breaker has
not tripped, but the
pump does not run.
a) Check 1a, 1b, 1d, 1e and 1f.