Type Designation; Applications; Technical Data; Ambient Temperature And Altitude - Grundfos CR Series Installation And Operating Instructions Manual

3. Type designation

3.1 Type key for CR, CRI, CRN 1s, 1, 3, 5, 10, 15 and 20

Example
Type range: CR, CRI, CRN
3
Rated flow rate in m /h
Number of impellers
Code for pump version
Code for pipework connection
Code for materials
Code for rubber pump parts
Code for shaft seal

3.2 Type key for CR, CRN 32, 45, 64, 90, 120 and 150

Example CR 32- 2 1- X- X- X- X- XXXX
Type range: CR, CRN
3
Rated flow rate in m /h
Number of stages
Number of impellers with reduced diameter
Code for pump version
Code for pipework connection
Code for materials
Code for rubber pump parts
Code for shaft seal

4. Applications

Grundfos multistage in-line centrifugal pumps, types CR, CRI and
CRN, are designed for a wide range of applications.
CR, CRI, CRN
CR, CRI and CRN pumps are suitable for liquid transfer,
circulation and pressure boosting of cold or hot clean liquids.
CRN
Use CRN pumps in systems where all parts in contact with the
liquid are made of high-grade stainless steel.
Pumped liquids
Warning
The pumping media is not suitable for the pump as it
can cause injury to persons or damage to the
equipment.
Thin, clean, non-flammable, non-combustible or non-explosive
liquids, not containing solid particles or fibres. The liquid must not
attack the pump materials chemically.
When pumping liquids with a density and/or viscosity higher than
that of water, use motors with correspondingly higher outputs, if
required.
6
CR 3- 10 X- X- X- X- XXXX

5. Technical data

5.1 Ambient temperature and altitude

Motor Motor
Motor
power efficiency
make
[kW] class
Grundfos
0.37 - 0.55 -
MG
Grundfos
0.75 - 22 IE3
MG
30-75 Siemens IE3
If the ambient temperature exceeds the above temperature
values or the pump is installed at an altitude exceeding the above
altitude values, 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.
In such cases, it may be necessary to use a motor with a higher
rated output.
P2
[%]
100
90
80
70
60
50
20 25 30 35 40 45 50 55 60 65 70 75 80
1000
Fig. 2 Motor output depends on temperature/altitude
Motor power
Pos.
[kW]
0.37 - 0.55
1
0.37 - 22
2 0.75 - 22
3 30-75
Example
Figure 2 shows that the load of an IE3 motor at an ambient
temperature of 70 °C must not be loaded more than 89 % of the
rated output. If the pump is installed 4750 metres above sea
level, the motor must not be loaded more than 89 % of the rated
output.
In cases where both the maximum temperature and the maximum
altitude are exceeded, the derating factors must be multiplied
(0.89 x 0.89 = 0.79).
For motor bearing maintenance at ambient
Note temperatures above 40 °C, see section
9. Maintenance.
Maximum
Maximum
altitude
ambient
above sea
temperature
level
[°C]
[m]
+40 1000
+60 3500
+55 2750
3
2
1
t [°C]
2250 3500 4750 m
Motor make
MG
MGE
MG
Siemens