Technical Data; Operating Conditions; Minimum Flow Rate; Ambient Temperature And Altitude - Grundfos MTR Montage- Und Betriebsanleitung

11. Technical data

11.1 Operating conditions

11.1.1 Operating pressure and liquid temperature
Pump type
Minimum liquid temperature [°C]
Maximum liquid temperature [°C]
Maximum operating pressure [bar]
* Applies to MTR pump version F.
The maximum liquid temperature depends on the
shaft seal type and the pump type. The maximum
liquid temperature is stated on the pump nameplate.
11.1.2 Maximum permissible operating pressure
and liquid temperature for the shaft seal
11.1.2.1 Shaft seals for MTR, MTRE
p [bar]
35
30
25
20
15
HUUE / HUUV
10
5
0
-20 -10 0 10 20 30 40 50 60 70 80 90 100 110
Maximum permissible operating pressure and liquid
temperature for the shaft seal.
Shaft
Description
seal *
O-ring seal (cartridge type),
HUUE/ balanced, tungsten carbide/
HUUV tungsten carbide, HUUE/
HUUV (EPDM/FKM)
* Other shaft seals on request.

11.1.3 Minimum flow rate

The curve shows the minimum flow rate as a
percentage of the rated flow rate in relation to the
liquid temperature.
Q
min
[%]
MTR
30
-10
90
20
(120 * )
10
25
0
40 50 60
Minimum flow rate in percentage of the rated flow
rate

11.1.4 Ambient temperature and altitude

The table shows the maximum permissible ambient
temperature at full load and the maximum permissible
installation altitude above sea level at full load.
Motor pow-
er
[kW]
t [°C]
0.06 - 0.18
0.25 - 0.55
0.75 - 22
Tempera-
ture range
30-45
[°C]
Motor output derating factors
-10 to +90
If the ambient temperature exceeds the maximum
permissible temperature value or the pump is
installed at an altitude exceeding the maximum
permissible altitude value, 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.
70 80 90 100
Do not use the pump at flow rates below
the minimum flow rate. The motor risks
overheating.
Max. am-
bient tem-
Motor make
perature
[°C]
Siemens 40
Grundfos
40
MG
Grundfos
60
MG
Siemens 55
110 120 O
t [ C]
Max. alti-
tude
[m]
1000
1000
3500
2750
21