Grundfos MTR - 11. Technical data; 11.1 Operating conditions; 11.1.3 Minimum flow rate; 11.1.4 Ambient temperature and altitude

11. Technical data
1
1.1 Operating conditions
11.1.1 Operating pressure and liquid temperature
Pump type MTR
Minimum liquid temperature [°C] -10
Maximum liquid temperature [°C]
90
(120
*
)
Maximum operating pressure [bar] 25
*
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
-20 -10 0 10 20 30 40 50 60 70 80 90 100 110
0
5
10
15
20
25
30
35
p [bar]
HUUE / HUUV
t [°C]
TM027854
Maximum permissible operating pressure and liquid
temperature for the shaft seal.
Shaft
seal
*
Description
Tempera-
ture range
[°C]
HUUE/
HUUV
O-ring seal (cartridge type),
balanced, tungsten carbide/
tungsten carbide, HUUE/
HUUV (EPDM/FKM)
-10 to +90
*
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.
40 50 60 8070 90 100
10
0
20
30
110 120
[%]
Qmin
t [ C]
O
TM045693
Minimum flow rate in percentage of the rated flow
rate
Do not use the pump at flow rates below
the minimum flow rate. The motor risks
overheating.
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]
Motor make
Max. am-
bient tem-
perature
[°C]
Max. alti-
tude
[m]
0.06 - 0.18 Siemens 40 1000
0.25 - 0.55
Grundfos
MG
40 1000
0.75 - 22
Grundfos
MG
60 3500
30-45 Siemens 55 2750
Motor output derating factors
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 ef
fect of
the air.
In such cases, it may be necessary to use a motor
with a higher rated output.
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English (GB)