Xylem HVS 1.1 - 3.4 - Manual (Page 20)

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4 Function buttons of the HYDROVAR SENSORLESS
CAUTION! Before you start the system, the pump has to be filled and all wiring and
piping has to be done!
The Hydrovar sensorless is delivered with the following settings as default:
Learning: enabled – allows to learn a reference curve
Auto Start:
enabled – after power supply automatic start
Other possibilities to use the push buttons of the Hydrovar sensorless:
START – Press ▲ button (if Autostart is disabled, the pump can be started by
pressing the ▼ button and then the ▲ button at the first start up or after a
power supply failure) or
STOP - Press the ▼ button.
Both buttons are located on the front plate of the Hydrovar sensorless
• Set Frequency for constant speed
For changing the speed without the external programming device, you have to do the
following:
1.) Press button ▼ to stop pump
2.) Press the ▲ and ▼ buttons together for more than 10 sec, the colour of the LED
changes to orange after 5 seconds and after further 5 seconds the LED changes to
orange fast flashing.
3.) Now you can change the speed of the pump by using the button ▲ (higher
frequency) or ▼ (lower frequency).
(If the external programming device is connected with HYDROVAR SENSORLESS, the
power as well as the frequency is shown on the display and you can also change the
frequency with the
▲ and ▼ buttons of the programming device.)
4.) When you have selected the right frequency, don’t press a button for 5 seconds and
that speed is saved automatically. Also after power supply fault the pump will run on
this speed.
5.) Press the ▲ and ▼ buttons together for 5 seconds the pump will stop.
If you have stored system points the HYDROVAR SENSORLESS start with automatic
mode.