Pump Settings; Control Types; Automatic Night Economy - WITA Delta HE 35 Série Instructions De Montage

8 Pump Settings

8.1

Control types

Display HE Pumpen
Proportional pressure control
During operation the pump is controlled by the proportional pressure control function. The
differential pressure is controlled via the pump depending on the delivery rate. The proportional
pressure characteristics are marked in the respective Q/H diagrams as PD1 to PD4.
Constant speed control
The constant speed characteristics are marked in the Q/H diagram as I to III. With this type of
control the pump is kept at a constant speed along the whole characteristic curve.
8.2

Automatic night economy

Requirements for automatic night economy:
Pumps installed in gas water heaters, which have only a small water volume,
may never be set to automatic night economy.
If the heating system supplies too little heat to the radiators, check whether automatic night
economy is activated. If so, deactivate the automatic night economy function.
The following requirements must be fulfilled to the night economy function
operates correctly:
1. The pump must be installed in the flow
2. The heating system must be equipped with automatic flow temperature control.
How the automatic night economy function works
Press the button to activate the night economy function. If the illuminated panel to the
side lights up, the night economy function is activated and the pump switches automatically
between normal operation and night economy. The changeover depends on the flow
temperature. The pump switches automatically to night economy if the flow temperature drops
by more than 10° - 15 °C within 1 hour. "- C" appears in the display.
The changeover to normal operation takes place without delay as soon as the flow temperature
has increased again by 3°C.
WITA Delta HE 35-XX | 55-XX
Operating Instrutions
Note
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