Elpress LDC-Q, User Manual

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User manual & technical documentation – LDC-Q – EN – Rev 1.1 - 20022018
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Technical specifications
The installation is constructed from the following components:
•
The booster unit consists of 1 Grundfos centrifugal pump of type CRIE. This is a
normally aspirating, vertical, multi-stage centrifugal pump with an in-line design and
fitted with a directly coupled 380-480V electric motor. The electric motor has an
integrated frequency controller. All important components that come into contact with
the medium, such as impellers, pump shaft, enclosure and separating chamber are
manufactured from stainless steel. The pump bearings are lubricated by the pumped
medium. The mechanical shaft seal is made of cemented carbide. The maximum
operating pressure is approx. 20 bar. Further details on this pump are enclosed
elsewhere in this documentation.
•
A non-return valve is installed immediately downstream of the pump to ensure that
the pressure is maintained in the pipework. A pressure sensor is also installed on the
pressure line. The signal from the pressure sensor goes directly to the frequency
controller, which controls the pump.
• A switch box with main switch.
•
The centrifugal pump has a supply line on the suction side. A pressure switch is
installed on this line to monitor the minimal flow pressure. A pressure gauge is also
installed.
•
The unit provides protection against excessively high water temperatures by means
of a thermostat on the pump which switches off the installation when the water
temperature exceeds 70°C.
•
All components are mounted on a frame which, if necessary, should be anchored to
the wall or set up level using the adjustable feed supplied (option).
• The centrifugal pump is connected to a break tank. The level in the break tank is
regulated by means of three level regulators and a solenoid valve. The lowest level
regulator is for the low level signal, which switches off the installation completely. A
bypass line is installed at the top of the pump which constantly pumps a small
quantity of water back into the break tank as a way of continually venting the pump.
OPTION: BREAK