Dynamic System Adjustment by HYDROVAR® Retrofit

10/06/2007

Application: Municipal water supply

The most distinctive building of Jena and the highest
business building in Thuringia/Germany, the former Uni
tower, with a height of 159 m, was completely renovated and rebuilt 30 years after its construction.
The complete building technology has been updated.
Two years later, the additional extension of the tower by a
modern shopping and service center required the
adjustment of the new airconditioning system to the
changed conditions.
Besides others, fixed speed circulator pumps have to be
replaced by variable speed pumps and also, connection to
the BUS system of the building’s control and communication system has to be realised. This had to be done with lean space and a fixed budget.
The executive Consultants decided to retrofit the pumps on hand with the HYDROVAR® speed controller of LOWARA, an enterprise of ITT Corporation. Retrofitting of 7 pumps with motor power from 3 to 7.5 kW was done by a Thuringian company, who was authorised to adjust the complete control and communication system.
Using the HYDROVAR® speed controller mounted to the
existing motors, the single and twin pumps on hand with
their motors could be used furtheron. Now, depending on
the requirements, the pumps control acc. to temperature
or pressure, change inbetween at double-pump operation
or complement one another at higher performance need
and communicate the working conditions with the control
system. So, the existing pumps were brought to state-of the-art at low-cost and easy installation.

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