Technical Data; Operating Conditions; Ambient Temperature And Altitude - Grundfos CR Serie Instrucciones De Instalación Y Funcionamiento

9. Technical data

9.1 Operating conditions

9.1.1 Liquid temperature
Figure 1 in the appendix states the relationship
between liquid temperature range and maximum
permissible operating pressure.
The maximum permissible operating
pressure and liquid temperature ranges
apply to the pump only.

9.1.2 Ambient temperature and altitude

Motor power
Motor make
[kW]
0.37 - 0.55 Grundfos MG
0.75 - 22 Grundfos MG
30.0 - 75.0
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. 19 Motor output in relation to temperature
and altitude
Motor power
Pos.
[kW]
0.37 - 0.55
1
0.37 - 22
2 0.75 - 22
3 30.0 - 75.0
Motor efficiency
class
IE3
Siemens IE3
3
2
1
t [°C]
2250 3500 4750 m
Motor make
MG
MGE
MG
Siemens
Maximum ambient
temperature
[°C]
- +40
+60
+55
Example
Figure 19 shows that the load of an IE3 motor at an
ambient temperature of 70 °C must not exceed 89 %
of the rated output.
If the pump is installed 4750 m 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).
Maximum altitude
above sea level
[m]
1000
3500
2750
21