Operating Conditions - Lorentz PS Série Manuel D'installation Et De Fonctionnement

4 Operating Conditions

Ambient requirements: PS pump systems can be oper-
ated up to 3000 meters above sea level and at an ambient
temperature of up to 50 °C. The PS controller is designed
for use in environments classified as pollution degree 3 in
accordance with IEC-664-1: Conductive pollution occurs,
or dry non-conductive pollution, which becomes conductive
due to condensation, is to be expected.
Fluid: LORENTZ PS Helical Rotor (HR) and Centrifugal
pumps can be used for drinking water supply, livestock
watering and irrigation applications not containing solid or
long fibred particles larger than sand grains, with a max.
grain size of 2 mm. The max. permitted sand content is 50
ppm, a higher sand content will reduce the pump life con-
siderably due to wear. The max. salt content is 300-500 ppm
at max. 30°C / 85°F. Defects due to pumping other liquids
are not covered by the warranty.
LORENTZ PS BOOST pumps can be used for clean water ap-
plications only. The water must not contain any abrasive par-
ticles. It is highly recommended to install an intake strainer
to protect the pump from any dirt ingress. Please refer to
"8.5.4 Filtering" on page 51 for further information.
Fluid temperature: Depending on the type of your
LORENTZ pump system, different requirements for fluid
temperatures apply:
PS centrifugal submersible - The maximum fluid temper-
ature for centrifugal submersible pumps is +50 °C.
PS centrifugal surface - The maximum fluid temperature
for centrifugal surface pumps is +70 °C.
PS boost surface - The maximum fluid temperature for
boost pumps is +80 °C.
Operating Conditions
PS helical rotor (HR) submersible - Designing and
building helical rotor pumps for a narrow range of fluid
temperature is important to ensure the best possible effi-
ciency. LORENTZ PS helical rotor pumps are available in five
different temperature classes:
Temp. class 0:
Temp. class 1: +10 – +20 °C
Temp. class 2: +20 – +30 °C
Temp. class 3:
+30 – +40 °C
Temp. class 4: +40 – +50 °C
The pumps have a tolerance range of ± 2 °C regarding
the respective temperature ranges, except for the lowest
allowed temperature of 0 °C.
The temperature class is part of the pump units' name tag,
please refer to chapter"3.3 Naming" on page 8. The
pump system shall only be operated within the temperature
range specified upon ordering.
CAUTION – PS200 HR pump ends and
pump units must always be ordered with
the next higher temperature class, to avoid
starting problems in weak irradiation
conditions.
CAUTION – Operating the pump outside of
the specified temperature range can lead
to reduced efficiency and/or damage the
pump and can void the warranty.
0 – +10 °C
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