Grundfos CR User manual

GRUNDFOS INSTRUCTIONS
CR, CRI, CRN, CRT
Installation and operating instructions

Table of contents
2
CR, CRI, CRN, CRT
English (US)
Installation and operating instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Français (CA)
Notice d'installation et de fonctionnement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Español (MX)
Instrucciones de instalación y operación . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

3
English (US)
English (US) Installation and operating instructions
Original installation and operating instructions
CONTENTS
Page
1. Limited warranty
Products manufactured by Grundfos Pumps Corporation
(Grundfos) are warranted to the original user only to be free of
defects in material and workmanship for a period of 24 months
from date of installation, but not more than 30 months from date
of manufacture. Grundfos' liability under this warranty shall be
limited to repairing or replacing at Grundfos' option, without
charge, F.O.B. Grundfos' factory or authorized service station,
any product of Grundfos manufacture. Grundfos will not be liable
for any costs of removal, installation, transportation, or any other
charges that may arise in connection with a warranty claim.
Products which are sold, but not manufactured by Grundfos, are
subject to the warranty provided by the manufacturer of said
products and not by Grundfos' warranty.
Grundfos will not be liable for damage or wear to products caused
by abnormal operating conditions, accident, abuse, misuse,
unauthorized alteration or repair, or if the product was not
installed in accordance with Grundfos' printed installation and
operating instructions and accepted codes of good practice. The
warranty does not cover normal wear and tear.
To obtain service under this warranty, the defective product must
be returned to the distributor or dealer of Grundfos' products from
which it was purchased together with proof of purchase and
installation date, failure date and supporting installation data.
Unless otherwise provided, the distributor or dealer will contact
Grundfos or an authorized service station for instructions. Any
defective product to be returned to Grundfos or a service station
must be sent freight prepaid; documentation supporting the
warranty claim and/or a Return Material Authorization must be
included if so instructed.
Grundfos will not be liable for any incidental or consequential
damages, losses, or expenses arising from installation, use, or
any other causes. There are no express or implied warranties,
including merchantability or fitness for a particular purpose, which
extend beyond those warranties described or referred to above.
Some jurisdictions do not allow the exclusion or limitation of
incidental or consequential damages and some jurisdictions do
not allow limitations on how long implied warranties may last.
Therefore the above limitations or exclusions may not apply to
you. This warranty gives you specific legal rights and you may
also have other rights which vary from jurisdiction to jurisdiction.
Products which are repaired or replaced by Grundfos or
authorized service center under the provisions of these limited
warranty terms will continue to be covered by Grundfos warranty
only through the remainder of the original warranty period set
forth by the original purchase date.
1. Limited warranty 3
2. General information 4
2.1 Hazard statements 4
2.2 Notes 4
3. Introduction 4
4. Receiving the product 5
4.1 Transporting the product 5
4.2 Receiving the product 5
4.3 Lifting instructions 5
4.4 Inspecting the product 5
4.5 Ensure you have the right pump 5
4.6 Pump end without motor 6
4.7 Drive-end motor bearing 6
5. Identification 6
5.1 Nameplate data 6
5.2 Type keys 7
6. Applications 10
7. Operating conditions 10
7.1 Ambient temperature and altitude 10
7.2 Liquid temperatures 10
7.3 Minimum inlet pressures 10
7.4 Maximum inlet pressures 11
7.5 Maximum operating pressures 11
8. Mechanical installation 12
8.1 Lifting the product 12
8.2 Pump location 12
8.3 Outside installation 12
8.4 Foundation 12
8.5 Pump mounting 14
8.6 Inlet pipe 14
8.7 Outlet pipe 14
8.8 Bypass 15
8.9 Flange forces and torques 16
8.10 Minimum continuous duty flow rates [gpm] 17
8.11 Check valves 17
8.12 Temperature rise 18
9. Electrical connection 18
9.1 Motors 19
9.2 Position of terminal box 19
9.3 Field wiring 19
9.4 Motor protection 19
10. Starting up the product 20
10.1 Priming 20
10.2 Startup instructions 21
11. Operating the product 21
11.1 Operating parameters 21
11.2 Pump cycling 22
11.3 Boiler feed installations 22
11.4 Frost protection 22
12. Servicing the product 22
12.1 Contaminated products 22
13. Maintaining the pump 23
14. Maintaining the motor 23
14.1 Motor inspection 23
14.2 Motor lubrication 24
15. Replacing the motor 25
15.1 Disassembly 25
15.2 Assembly 25
16. Parts list 27
16.1 Spare parts 27
17. Preliminary electrical tests 28
17.1 Supply voltage 28
17.2 Current 28
17.3 Insulation resistance 28
18. Startup of pump with air-cooled top (Cool-Top®)29
19. Diagnosing specific problems 30
20. Worksheet for three-phase motors 33
21. Disposal 34
Read this document before installing the product.
Installation and operation must comply with local
regulations and accepted codes of good practice.

English (US)
4
2. General information
2.1 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:
2.2 Notes
The symbols and notes below may appear in Grundfos
installation and operating instructions, safety instructions and
service instructions.
3. Introduction
The CR range is based on the inline multistage centrifugal pump
first pioneered by Grundfos. CR is available in four basic
materials and over one million configurations. CR is suitable for
pumping water and water-like liquids in industry, petrochemical
plants, water treatment plants, commercial buildings, and many
other applications. Some of the outstanding characteristics of CR
are:
• superior efficiency
• reliability
• easy maintenance
• compact size and small footprint
• quiet operation.
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.
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.

5
English (US)
4. Receiving the product
4.1 Transporting the product
4.2 Receiving the product
4.3 Lifting instructions
Lift pump assembly with lifting straps that pass through the motor
stool. Ensure that the load is not applied to the pump shaft.
Fig. 1 Correct lifting of a CR pump
4.4 Inspecting the product
Before you install the product, do the following:
• Check that the product is as ordered.
• Check that no visible parts have been damaged during
shipment.
• Ensure that the pump is NOT dropped or mishandled.
If parts are damaged or missing, contact your local Grundfos
sales company.
The packing in which your pump arrived is specially designed for
your pump to prevent damage during shipment. As a precaution,
leave the pump in the packing until you are ready to install it.
Installing the product
4.5 Ensure you have the right pump
Check the pump nameplate to make sure that it is the one you
ordered.
•CR: Centrifugal pump; all parts in contact with the pumped
liquid are made of standard cast iron and AISI 304 stainless
steel
•CRI: Centrifugal pump; all parts in contact with the pumped
liquid are made of AISI 304 stainless steel
•CRN: Centrifugal pump; all parts in contact with the pumped
liquid are made of AISI 316 stainless steel
•CRT: Centrifugal pump; all parts in contact with the pumped
liquid are made of titanium
•CRE: Centrifugal pump with a Grundfos MLE variable
frequency drive motor.
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 and fixed position
during unpacking.
- Wear personal protective equipment.
WARNING
Falling objects
Death or serious personal injury
- 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.
Do not use the lifting eyes of the motor for lifting the
entire pump and motor assembly.
Note that typically the centre of gravity of the pump is
close to the motor.
TM04 0339 0608

English (US)
6
4.6 Pump end without motor
Pump without motor (CR, CRI, CRN 1s, 1, 3, 5, 10, 15, and 20
only)
If you purchased a pump end without motor, the shaft seal has
been set from factory. Do not loosen the three set screws on the
shaft seal when attaching the motor.
Pump without motor (CR, CRN 32, 45 and 64 only)
If you purchased a pump end without motor, you must install the
shaft seal. The shaft seal is protected in its own box inside the
pump packing crate. To protect the shaft and bearings during
shipment, a transport protector is used. Remove the transport
protector prior to installation of the shaft seal. Read the seal
installation instructions which are included in the pump packing.
4.7 Drive-end motor bearing
Make sure to use the correct type of drive-end (DE) motor
bearing for the bare-shaft pump. Please check the specific pump
range and pump version stated on the nameplate and select the
corresponding DE bearing.
DE bearing CR 1-64 pump range
1) Refer to the codes for pump version in section 5.2 Type keys.
2) Factory product variants (FPV).
5. Identification
5.1 Nameplate data
The information on the pump nameplate is described below.
Fig. 2 Nameplate example
If the shipment consists of a complete unit (motor
attached to pump end), the position of the coupling
connecting the pump shaft to the motor shaft is set to
factory specifications. No adjustment is required.
If the shipment is a pump end without motor, follow
the adjustment procedures in section 15. Replacing
the motor.
Pump version1) Deep-groove ball
bearing
(62/63xx)
Angular contact
bearing
(73xx)
A Standard pump 0.33 - 10 HP 15 - 60 HP
T Pump with thrust handling
device (THD)2) --
Z Pump with bearing
flange2) 0.33 - 60 HP Not allowed
TM07 5722 5019
Pos. Description
1Version
2 Product number
3 Serial number
4 Model
5 Type designation
6 Frequency
7 Rated speed
8 Weight excluding motor
9 Motor-rated power output
10 Rated flow rate
11
Direction of rotation
CCW: Counterclockwise
CW: Clockwise
12 Head at rated flow rate / Maximum head
13 Hydraulic efficiency at rated flow rate
14
Maximum system pressure / Maximum liquid
temperature.
Note: This field may have two sets of data.
15 Pump Energy Index, constant load
16 Pump Energy Index, variable load
17 Impeller diameter
18 External reference
(Other Equipment Manufacturer number)
19 Production code
20 Country of origin
21 Approval marks
Ver-PN-SN
p
DK-8850 Bjerringbro, Denmark
Hz RPM
GPM
%
PEI
P code:
PEIVL
CL Imp.Dia. (in)
H /Hmax
pmax/tmax
hp [P2]
1 2 3
4 5
678
910 11
12 13
14
15 16 17
18 19
20

7
English (US)
5.2 Type keys
5.2.1 CR, CRI, CRN 1s, 1, 3, 5, 10, 15, and 20
5.2.2 CR, CRN 32, 45 and 64
5.2.3 CRT 2, 4, 8, and 16
Example CR 3- 10 A FG A E HQQE
Type range: CR, CRI, CRN
Rated flow rate in [m3/h] (x 5 gpm)
Number of impellers
Code for pump version
Code for pipe connection
Code for materials
Code for rubber parts
Code for shaft seal
Example CR 32- 2- 1 A G A E KUBE
Pump range: CR, CRN
Rated flow rate in [m3/h] (x 5 gpm)
Number of impellers
Number of reduced-diameter impellers
Code for pump version
Code for pipe connection
Code for materials
Code for rubber parts
Code for shaft seal
Example CRT 16- 30 /2 A G A AUUE
Pump range: CRT
Rated flow rate in [m3/h] (x 5gpm)
Number of stages x 10
Code for impellers (used only if the pump has
fewer impellers than stages)
Code for pump version
Code for pipe connection
Code for materials
Code for shaft seal and rubber parts

English (US)
8
5.2.4 Codes
Example A-G-A -E -H QQ E
Pump version
A Basic version1)
BOversize motor
E Certificate/approval
F CR pump for high temperatures (air-cooled top assembly)
H Horizontal version
HS High-pressure pump with high-speed MLE motor
I Different pressure rating
J Pump with different max. speed
K Pump with low NPSH
M Magnetic drive
N Fitted with sensor
P Undersize motor
R Horizontal version with bearing bracket
SF High-pressure pump
T Oversize motor (two flange sizes bigger)
U NEMA version1)
X Special version2)
Pipe connection
A Oval flange, Rp thread
B Oval flange, NPT thread
CA FlexiClamp (CRI(E), CRN(E) 1, 3, 5, 10, 15, 20)
CX Triclamp (CRI(E), CRN(E) 1, 3, 5, 10, 15, 20)
F DIN flange
G ANSI flange
J JIS flange
N Changed diameter of ports
P PJE coupling
X Special version
Materials
A Basic version
D Carbon-graphite filled PTFE (bearings)
G Wetted parts, AISI 316
GI All parts stainless steel, wetted parts, AISI 316
I Wetted parts, AISI 304
II All parts stainless steel, wetted parts, AISI 304
K Bronze (bearings)
S SiC bearings + PTFE neck rings
X Special version
Code for rubber parts
EEPDM
FFXM
K FFKM
VFKM

9
English (US)
1) In August 2003 the NEMA version pump code was discontinued for all material numbers created by Grundfos manufacturing
companies in North America. The NEMA version pump code will still remain in effect for existing material numbers. NEMA version
pumps built in North America after this change will have either an A or a U as the pump version code depending on the date the
material number was created.
2) If a pump incorporates more than two pump versions, the code for the pump version is X. X also indicates special pump versions not
listed above.
Shaft seal
A O-ring seal with fixed driver
B Rubber bellows seal
E Cartridge seal with O-ring
H Balanced cartridge seal with O-ring
K Metal bellows cartridge seal
O Double seal, back-to-back
P Double seal, tandem
X Special version
B Carbon, synthetic resin-impregnated
H Cemented tungsten carbide, embedded (hybrid)
Q Silicon carbide
U Cemented tungsten carbide
X Other ceramics
EEPDM
FFXM
K FFKM
VFKM
Example A-G-A -E -H QQ E

English (US)
10
6. Applications
Compare the pump’s nameplate data or its performance curve
with the application in which you plan to install it. Make sure the
application falls within the following limits.
7. Operating conditions
7.1 Ambient temperature and altitude
If the ambient temperature exceeds the maximum temperature
limits of the pump or the pump is installed at an altitude
exceeding the altitude values in the chart below, the motor must
not be fully loaded due to the risk of overheating.
Overheating may result from excessive ambient temperatures or
the low density and consequently low cooling effect of the air at
high altitudes. In such cases, it may be necessary to use a motor
with a higher rated output (P2).
Fig. 3 Relationship between motor output (P2) and ambient
temperature/altitude
Legend
Example: From fig. 3 it appears that P2 must be reduced to 88 %
when a pump with a NEMA premium-efficiency ML motor is
installed 15,584 feet above sea level. At an ambient temperature
of 167 °F, P2 of a standard-efficiency motor must be reduced to
74 % of rated output.
In cases where both the maximum temperature and the maximum
altitude are exceeded, the derating factors must be multiplied.
Example: 0.89 x 0.89 = 0.79.
7.2 Liquid temperatures
All motors are designed for continuous duty in 104 °F (40 °C)
ambient air conditions. For higher ambient temperature
conditions, consult Grundfos.
* We recommend xUBE shaft seals for temperatures above
200 °F. Pumps with KUHE hybrid shaft seals can only operate
up to 200 °F (90 °C). Pumps with xUUE shaft seals can be
operated down to -40 °F (-40 °C). ("x" is the seal type).
7.3 Minimum inlet pressures
Type Application/liquid
CR Hot and chilled water, boiler feed, condensate
return, glycols and solar thermal liquids.
CRI/CRN
Deionized, demineralized and distilled water.
Brackish water and other liquids unsuitable for
contact with iron or copper alloys. (Consult
manufacturer for specific liquid compatibilities.)
CRN-SF High-pressure washdown, reverse osmosis or other
high-pressure applications.
CRT Salt water, chloride based liquids and liquids
approved for titanium.
TM03 4272 2006
Pos. Description
1 NEMA standard-efficiency motors
2 NEMA premium-efficiency motors
60 80 100 120 140 160 180
T [°F]
50
60
70
80
90
100
[%]
P2
1
2
3280 7382 11483 15584 ft
Pump Liquid temperature
CR, CRI, CRN 1s, 3, 5, 10, 15, and 20 -4 to +248 °F
(-20 to +120 °C)
CR, CRN 32, 45 and 64* -22 to +248 °F
(-30 to +120 °C)
CRT 2, 4, 8, 16 -4 to +248 °F
(-20 to +120 °C)
CRN-SF -4 to +221 °F
(-15 to +105 °C)
Pumps with Cool-Top™ up to 356 °F
(180 °C)
Maximum water temperature for NSF 61 drinking
water applications is limited to 73 °F (23 °C).
All CR, CRI, CRN NPSHR + 2 feet
CRN-SF 29 psi (2 bar)

11
English (US)
7.4 Maximum inlet pressures
* While pump is off or during start-up.
** During operation.
7.5 Maximum operating pressures
250 °F (194 °F for CRN-SF)
Consult Grundfos in case of other operating conditions.
Pump type Stages Max.
[psi (bar)]
60 Hz 50 Hz
CR, CRI, CRN 1s 2-27 2-36 145 (10)
CR, CRI, CRN 1 2-25 2-36 145 (10)
27 217 (15)
CR, CRI, CRN 3 2-17 2-29 145 (10)
19-25 31-36 217 (15)
CR, CRI, CRN 5 2-9 3-16 145 (10)
10-24 18-36 217 (15)
CR, CRI, CRN 10 1-5 1-6 116 (8)
6-17 7-22 145 (10)
CR, CRI, CRN 15 1-2 1-3 116 (8)
3-12 4-17 145 (10)
CR, CRI, CRN 20 1 1-3 116 (8)
2-10 4-17 145 (10)
CR, CRN 32 1-1 - 2 1-1 - 4 58 (4)
3-2 - 6 5-2 - 10 145 (10)
7-2 - 11-2 11-14 217 (15)
CR, CRN 45 1-1 - 1 1-1 - 2 58 (4)
2-2 - 3 3-2 - 5 145 (10)
4-2 - 8-1 6-2 - 13-2 217 (15)
CR, CRN 64 1-1 1-1 - 2-2 58 (4)
1 - 2-1 2-1 - 4-2 145 (10)
2 - 5-2 4-1 - 8-1 217 (15)
CRT 2 2-6 2-11 145 (10)
7-18 13-26 217 (15)
CRT 4 1-7 1-12 145 (10)
8-16 14-22 217 (15)
CRT 8 1-16 1-20 145 (10)
CRT 16 2-10 2-16 145 (10)
CRN-SF all all 72 (5)*
362 (25)**
Pump type/
connection
Stages Max.
[psi (bar)]
60 Hz 50 Hz
CR, CRI, CRN 1s
Oval flange 1-17 1-23 232 (16)
FGJ, PJE 1-27 1-36 362 (25)
CR, CRI, CRN 1
Oval flange 1-17 1-23 232 (16)
FGJ, PJE 1-27 1-36 362 (25)
CR, CRI, CRN 3
Oval flange 1-17 1-23 232 (16)
FGJ, PJE 1-27 1-36 362 (25)
CR, CRI, CRN 5
Oval flange 1-16 1-22 232 (16)
FGJ, PJE 1-24 1-36 362 (25)
CR, CRI 10
Oval flange CR 1-6 145 (10)
Oval flange, CRI 1-10 1-16 232 (16)
FGJ, GJ, PJE 1-10 1-16 232 (16)
FGJ, GJ, PJE 12-17 17-22 362 (25)
CRN 10
All 1-17 1-22 362 (25)
CR, CRI 15
Oval flange 1-5 1-7 145 (10)
FGJ, GJ, PJE 1-8 1-10 232 (16)
FGJ, GJ, PJE 9-12 12-17 362 (25)
CRN 15
All 1-12 1-17 362 (25)
CR, CRI 20
Oval flange 1-5 1-7 145 (10)
FGJ, GJ, PJE 1-7 1-10 232 (16)
FGJ, GJ, PJE 8-10 12-17 362 (25)
CRN 20
All 1-10 1-17 362 (25)
CR, CRN 32
1-1 - 5 1-1 - 7 232 (16)
6-2 - 11-2 8-2 - 14 435 (30)
CR, CRN 45
1-1 - 4-2 1-1 - 5 232 (16)
4-2 - 8-1 6-2 - 13-2 435 (30)
CR, CRN 64
1-1 - 3 1-1 - 5 232 (16)
4-2 - 5-2 6-2 - 8-1 435 (30)
CRT 2 2-18 2-26 305 (21)
CRT 4 1-16 1-22 305 (21)
CRT 8
1-8 1-12 232 (16)
10-16 14-20 362 (25)
CRT 16
1-8 1-8 232 (16)
10-12 10-16 362 (25)
Pump type/
connection
Stages Max.
[psi (bar)]
60 Hz 50 Hz

English (US)
12
8. Mechanical installation
8.1 Lifting the product
For lifting instructions, see section 4.3 Lifting instructions.
8.2 Pump location
Locate the pump in a dry, well-ventilated, frost-free area which is
not subject to extreme variation in temperature.
Make sure the pump is mounted at least 6 inches (150 mm) clear
of any obstruction or hot surfaces.
The motor requires an adequate air supply to prevent overheating
and adequate vertical space to remove the motor for repair.
In open systems requiring suction lift, locate the pump as close to
the liquid source as possible to reduce friction loss in pipes.
8.3 Outside installation
Grundfos recommends that pumps installed outside have rain
cover for the motor and remove, at a minimum, one of the motor
drain plugs. Failure to remove a motor drain plug will result in
condensation in the motor and cause motor damage or failure.
Grundfos recommends that you consult the motor manufacturer’s
installation and operation instructions.
8.4 Foundation
Use concrete or similar foundation material to provide a secure,
stable mounting base for the pump.
See table below for bolt hole center line dimensions for the
various pump types.
Secure the pump to the foundation using all four bolts and shim
pump base to assure the pump is vertical and all four pads on the
base are properly supported (uneven surfaces can result in pump
base breakage when mounting bolts are tightened).
Fig. 4 Pump position
The pump can be installed vertically or horizontally. See fig. 4.
Ensure that an adequate supply of cool air reaches the motor
cooling fan. The motor must never fall below the horizontal plane.
Arrows on the pump base show the direction of flow of liquid
through the pump.
To minimize possible noise from the pump, it is advisable to fit
expansion joints on either side of the pump and anti-vibration
mountings between the foundation and the pump.
Fit isolating valves on either side of the pump to avoid draining
the system if the pump needs to be cleaned, repaired or replaced.
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.
The pump must be installed according to national
water regulations and standards.
WARNING
Falling objects
Death or serious personal injury
- 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.
TM04 3906 0409
Make sure the vent plug is located in the uppermost
position.

13
English (US)
Base and bolt hole center line dimensions
TM00 2256 3393
Pump type L1 L2 B1 B2 ∅
[inches] [mm] [inches] [mm] [inches] [mm] [inches] [mm] [inches] [mm]
CR 1s, 1, 3, 5 3 15/16 100 5 11/16 145 7 1/16 180 8 11/16 220 1/2 13
CRI, CRN 1s 1, 3, 5
CRT 2, 4 3 15/16 100 5 7/8 150 7 1/16 180 8 11/16 220 1/2 13
CR 10, 15, 20 5 1/8 130 6 15/16 176 8 7/16 215 10 1/16 256 9/16 13.5
CRN 10, 15, 20
CRT 8, 16 5 1/8 130 7 7/8 200 8 7/16 215 9 3/4 248 1/2 13
CR 32 6 11/16 170 8 3/4 223 9 7/16 240 11 3/4 298 9/16 14
CRN 32 6 11/16 170 8 7/8 226 9 7/16 240 11 3/4 298 9/16 14
CR 45, 64 7 1/2 190 9 3/4 248 10 1/2 266 13 1/16 331 9/16 14
CRN 45, 64 7 1/2 190 9 7/8 251 10 1/2 266 13 1/16 331 9/16 14
2
1
2
1
L
LB
4 x ø
B

English (US)
14
8.5 Pump mounting
8.5.1 Recommended installation torques
8.6 Inlet pipe
The inlet pipe should be adequately sized and run as straight and
short as possible to keep friction losses to a minimum (minimum
of four pipe diameters straight run prior to the inlet flange). Avoid
using unnecessary fittings, valves or accessory items. Use
butterfly valves in the inlet line only when it is necessary to isolate
a pump because of a flooded inlet condition. This would occur if
the water source is above the pump. See fig. 5 and fig. 6. Flush
piping prior to pump installation to remove loose debris.
Fig. 5 Flooded inlet
Fig. 6 Inlet lift*
* The inlet pipe should have a fitting on it for priming. CRN-SF
pumps cannot be used for inlet lift.
8.6.1 Inlet pipe sizes
The following recommended inlet pipe sizes are the smallest
sizes which should be used with any specific CR pump type.
Verify the inlet pipe size in each installation to ensure that good
pipe practices are being observed and excess friction losses are
not encountered.
High temperatures may require larger diameter pipes to reduce
friction and improve NPHSA.
8.7 Outlet pipe
We suggest to install a check valve and a isolating valve in the
outlet pipe.
Pipe, valves and fittings should be at least the same diameter as
the outlet pipe or sized in accordance with good piping practices
to reduce excessive flow velocities and friction losses in pipes.
Before installing the pump, pressure check the outlet piping to at
least the maximum pressure the pump is capable of generating or
as required by codes or local regulations.
Whenever possible, avoid high pressure-loss fittings, such as
elbows or branch tees directly on either side of the pump. The
piping should be adequately supported to reduce thermal and
mechanical stresses on the pump.
According to good installation practices, clean the system
thoroughly and flush it of all foreign materials and sediment prior
to pump installation. Furthermore, never install the pump at the
lowest point of the system due to the natural accumulation of dirt
and sediment. If there is excessive sediment or suspended
particles, we recommend that a strainer or filter is used. Grundfos
recommends that pressure gauges are installed on inlet and
outlet flanges or in pipes to monitor pump and system
performance.
WARNING
Pressurised system
Death or serious personal injury
- The pumps are shipped with covered inlet and
outlet ports. Remove the covers before the pipes
are connected to the pump.
Pump type
Recommended
foundation torque
[ft-lbs]
Recommended
flange torque
[ft-lbs]
CR, CRI, CRN 1s/1/3/5
CRT 2/4 30 37-44
CR, CRI, CRN 10/15/20
CRT 8/16 37 44-52
CR, CRN 32/45/64 52 52-59
TM05 9273 3613
TM05 9274 3613
Strainer
Reservoir
Butterfly
valve
Check
valve
Expansion joints
Butterfly
valve
Eccentric
reducer
Butterfly
valve
Suction
pipe
Foot valve
Reservoir
Check
valve
Pump type Min. inlet pipe size
CR, CRI, CRN 1s, 1, 3
CRT 2 1" Nominal diameter acc. to
ANSI schedule 40
CR, CRI, CRN 5
CRT 4 1 - 1/4" Nominal diameter acc. to
ANSI schedule 40
CR, CRI, CRN 10, 15, 20
CRT 8, 16 2" Nominal diameter acc. to
ANSI schedule 40
CR, CRN 32 2 - 1/2" Nominal diameter acc. to
ANSI schedule 40
CR, CRN 45 3" Nominal diameter acc. to
ANSI schedule 40
CR, CRN 64 4" Nominal diameter acc. to
ANSI schedule 40
The pressure rating of pipes, valves and fittings must
be equal to or greater than the maximum system
pressure.
To avoid problems with water hammer, do not use
quick-closing valves in CRN-SF applications.

15
English (US)
8.8 Bypass
Install a bypass in the outlet pipe if there is any risk that the pump
may operate against a closed valve in the outlet line. Flow
through the pump is required to ensure that adequate cooling and
lubrication of the pump is maintained. See 7.3 Minimum inlet
pressures for minimum flow rates.
Elbows should be at least 12" from the bypass opening to prevent
erosion.
Fig. 7 Recommended bypass arrangement
Fig. 8 Optional bypass arrangement
Fig. 9 Optional bypass arrangement for CR, CRN 32, 45 and
64
TM04 3926 3613TM04 3909 3613TM04 3924 0409
Outlet
Inlet
Bypass line
Bypass
opening
Outlet
Bypass line
Bypass
opening
Inlet
Bypass line
Bypass
opening
Inlet Outlet

English (US)
16
8.9 Flange forces and torques
If not all loads reach the maximum permissible value stated in the
tables after fig. 10, one of these values may exceed the normal
limit. Contact Grundfos for further information.
Fig. 10 Flange forces [F] and torques [M]
Force limits
Torque limits
TM04 0346 2013
Y-direction: Inlet/outlet
Z-direction: Direction of chamber stack
X-direction: 90 ° from inlet/outlet
Flange Pump CR -
Cast iron pump housing
CRI, CRN -
Stainless steel pump housing
ANSI
[in]
DN
[mm] Type
Force,
Y-direction
[lb]
Force,
Z-direction
[lb]
Force,
X-direction
[lb]
Force,
Y-direction
[lb]
Force,
Z-direction
[lb]
Force,
X-direction
[lb]
1/
1 1/4 25/32 1s-5 76 89 72 152 177 143
1 1/2 40 10 93 105 84 185 211 169
2 50 15, 20 127 131 114 253 261 228
2 1/2 65 32 156 177 143 312 354 287
3 80 45 211 173 190 421 346 379
4 100 64 282 228 253 565 455 506
Flange Pump CR -
Cast iron pump housing
CRI, CRN -
Stainless steel pump housing
ANSI
[in]
DN
[mm] Type
Torque,
Y-direction
[ft-lb]
Torque,
Z-direction
[ft-lb]
Torque,
X-direction
[ft-lb]
Torque,
Y-direction
[ft-lb]
Torque,
Z-direction
[ft-lb]
Torque,
X-direction
[ft-lb]
1/
1 1/4 25/32 1s-5 221 129 92 443 258 184
1 1/2 40 10 295 203 148 590 406 295
2 50 15, 20 332 240 184 664 479 369
2 1/2 65 32 369 258 221 738 516 443
3 80 45 240 295 406 479 590 811
4 100 64 277 350 461 553 701 922

17
English (US)
8.10 Minimum continuous duty flow rates [gpm]
* Grundfos Cool-Top® is only available in the following pump types:
8.11 Check valves
A check valve may be required on the outlet side of the pump to
prevent the pump inlet pressure from being exceeded.
When a pump with no check valve is stopped because there is no
demand on the system (all valves are closed), the high system
pressure on the outlet side of the pump will "find" its way back to
the inlet of the pump.
This is especially critical for CRN-SF applications because of the
very high outlet pressures involved. As a result, most CRN-SF
installations require a check valve on the outlet piping.
Pump type min. °F to 176 °F
(min. °C to 80 °C)
at 210 °F
(at 99 °C)
at 248 °F
(at 120 °C)
at 356 °F
(at 180 °C)
CR, CRI, CRN 1s 0.5 0.7 1.2 1.2*
CR, CRI, CRN 1 0.9 1.3 2.3 2.3*
CR, CRI, CRN 3 1.6 2.4 4.0 4.0*
CR, CRI, CRN 5 3.0 4.5 7.5 7.5*
CR, CRI, CRN 10 5.5 8.3 14 14*
CR, CRI, CRN 15 9.5 14 24 24*
CR, CRI, CRN 20 11 17 28 28*
CR, CRN 32 14 21 35 35*
CR, CRN 45 22 33 55 55*
CR, CRN 64 34 51 85 85*
CRT 2 1.3 2.0 3.3 N/A
CRT 4 3.0 4.5 7.5 N/A
CRT 8 4.0 6.0 10 N/A
CRT 16 8.0 12 20 N/A
Pump type CR 1s CR 1 CR 3 CR 5 CR 10 CR 15 CR 20 CR 32 CR 45 CR 64
Standard (CR) ●●●
I version (CRI) ●●●●●●●
N version (CRN) ●●●●●●●●●●

English (US)
18
8.12 Temperature rise
It may sometimes be necessary to stop the flow through a pump
during operation.
When the flow is stopped, the power to the pump is transferred to
the pumped liquid as heat, causing a temperature rise in the
liquid.
The result is risk of overheating and consequent damage to the
pump. The risk depends on the temperature of the pumped liquid
and for how long the pump is operating without flow. See the
following temperature rise table.
Conditions/reservations
The listed times are subject to the following conditions/
reservations:
• No exchange of heat with the surroundings.
• The pumped liquid is water with a specific heat capacity of
1.0 Btu/lb. °F (4.18 kJ/kg °C).
• Pump parts (chambers, impellers and shaft) have the same
heat capacity as water.
• The water in the base and the pump head is not included.
These reservations should give sufficient safety margin against
excessive temperature rise.
The maximum temperature must not exceed the pump maximum
temperature rating.
9. Electrical connection
Verify the power supply to make sure that the voltage, phases
and frequency match those of the pump. The proper operating
voltage and other electrical information appear on the motor
nameplate. These motors are designed to run on - 10 %/+ 10 %
of the rated nameplate voltage. For dual-voltage motors, the
motor should be internally connected to operate on the voltage
closest to the 10 % rating, i.e., a 208 V motor should be wired
according to the 208 V wiring diagram. The wiring diagram can be
found on either a plate attached to the motor or on a label inside
the terminal box cover.
Pump type Time for temperature rise of 18 °F (10 °C)
Seconds Minutes
CR 1s, 1, 3 210 3.5
CR 5 240 4.0
CR 10 210 3.5
CR 15 150 2.5
CR 20 120 2.0
CR 32, 45, 64 --
All electrical work must be performed by a qualified
electrician in accordance with the latest edition of the
National Electrical Code and local codes and
regulations.
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
Electric shock
Death or serious personal injury
- The safe operation of this pump requires that it is
grounded in accordance with the National
Electrical Code and local codes and regulations.
- A faulty motor or faulty wiring can cause electric
shock that could be fatal, whether the motor is
touched directly or the current is conducted
through standing water. For this reason, safe
installation and operation require proper grounding
of the pump to the power supply ground (earth)
terminal.
- Connect the ground conductor to the grounding
screw in the terminal box and then to the
ACCEPTABLE grounding point.
- In all installations, connect the above-ground metal
plumbing to the power supply ground terminal as
described in Article 250-80 of the National
Electrical Code.
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 of the insulated type such as ceramic
bearings..
Do not operate the pump if voltage variations are
greater than - 10 %/+ 10 %.

19
English (US)
9.1 Motors
Grundfos CR pumps are supplied with heavy-duty, 2-pole (3600
rpm), ODP (open drip-proof) or TEFC (totally enclosed fan
cooled), NEMA C frame motors selected to our rigid
specifications.
Motors with other enclosure types and for other voltages and
frequencies are available on a special-order basis.
CRN-SF pumps are supplied with an IEC (metric) type motor with
a reverse thrust bearing.
If you replace the pump, but keep a motor previously used on
another CR pump, be sure to read section 14. Maintaining the
motor for proper adjustment of the coupling height.
If you install the pump outside, read section 8.3 Outside
installation.
9.2 Position of terminal box
The motor terminal box can be turned to any of four positions in
steps of 90 °.
To rotate the terminal box, remove the four bolts securing the
motor to the pump but do not remove the coupling. Turn the motor
to the desired position; replace and securely tighten the four
bolts. See fig. 11.
Fig. 11 Motor terminal box positions (top view)
9.3 Field wiring
Lead sizes should be based on the current carrying properties of
conductors required by the latest edition of the National Electrical
Code or local regulations. Direct-on-line (DOL) starting is
approved due to the extremely short run-up time of the motor and
the low moment of inertia of the pump and motor. If DOL starting
is not acceptable and reduced starting current is required, use an
auto transformer, resistance starter or soft starter. We suggest to
use a fused disconnect for each pump in case standby pumps are
installed.
9.4 Motor protection
9.4.1 Single-phase motors
All CR pumps with single phase motors, except 10 HP, are
equipped with multi-voltage, squirrel cage induction motors which
include built-in thermal protection.
9.4.2 Three-phase motors
CR pumps with three-phase motors must be used with the proper
size and type of motor-protective circuit breaker to ensure the
motor is protected against damage from low voltage, phase
failure, current unbalance and overloads.
Use a properly sized circuit breaker with manual reset and
ambient-temperature compensated extra-quick trip in all three
phases. The overload protection should be set and adjusted to
the full-load current rating of the motor. Under no circumstances
should the overload protection be set to a higher value than the
full-load current shown on the motor nameplate. This will void the
warranty.
Set overload protection for auto transformers and resistance
starters in accordance with the recommendations of the
manufacturer.
Three-phase MLE motors (CRE-pumps) require only fuses as
circuit breaker. They do not require a motor-protective circuit
breaker. Check for phase unbalance (worksheet is provided. See
section 20. Worksheet for three-phase motors).
9.4.3 CRN-SF
The CRN-SF is typically operated in series with a feed pump.
Because the maximum allowable inlet pressure of the CRN-SF
increases from 73 psi (when pump is off and during start-up) to
365 psi (during operation), use a control device to start the CRN-
SF pump one second before the feed pump starts. Similarly, the
CRN-SF must stop one second after the feed pump stops. See
CRN-SF start-up timeline below.
Fig. 12 CRN-SF start-up
TM04 3923 0409
Outlet
Position 9:00
Position 12:00
Inlet
Position 3:00
Standard terminal
box position (6:00)
Standard allowable phase unbalance is 5 %.
TM04 3921 0409
TIME
CRN-SF
starts
CRN-SF
stops
Feed pump
starts
Feed pump
stops
1 or more
seconds
1 or more
seconds
Both pumps operating
TIME
CRN-SF
starts Feed pump
starts
1 or more
seconds
Feed pump
stops CRN-SF
stops
1 or more
seconds
Both pumps operating

English (US)
20
10. Starting up the product
10.1 Priming
To prime the pump in a closed system or an open system where
the water source is above the pump, close the pump isolating
valve(s) and open the priming plug on the pump head. See fig.
13, fig. 14, and fig. 15.
Fig. 13 Position of plugs and bypass valve
Fig. 14 Position of plugs CR, CRN 32, 45, 64
Fig. 15 Vent plug
In open systems where the water level is below the pump inlet,
the inlet pipe and pump must be filled with liquid and vented
before starting the pump.
1. Close the outlet isolating valve and remove the priming plug.
2. Pour water through the priming hole until the inlet pipe and
pump are completely filled with liquid. If the inlet pipe does not
slope downwards away from the pump, the air must be purged
while priming the pump.
3. Replace the priming plug and tighten securely.
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
If the pump runs dry, the pump bearings and the
shaft seal may be damaged.
TM04 3922 3613
Drain plug
Bypass
valve
Priming vent plug
CR(I)(N) 1s, 1, 3, 5,
10, 15, 20
CRT 2, 4, 8, 16
Inlet
Drain plug
Outlet
TM04 4036 3613TM04 3920 3613
Vent plug
Outlet
Priming plug
(Opposite side)
Inlet
Drain plugs (G 1 1/2 A) with 1/4" NPI gauge/sensor
taps
Loosen
center plug
to vent
pump
Vent plug