37 / 76
Critical Water Level (parameter 2-7-1-2-10) can be set. With High-water Level (parameter
2-7-1-2-16) and Level for Reset High-water Level (parameter 2-7-1-2-15) a warning for a
possible tank overflow can be set.
8.9.3 Tank filling
Tank filling
Tank filling is controlled by the two fill levels Start Tank Filling Level (parameter 2-7-1-2-11)
and Stop Tank Filling Level (parameter 2-7-1-2-14). These fill levels lead to opening and
closing of the tank filling valve. The opening of the proportional valve between these two fill
levels is controlled in a linear manner. At the Stop Tank Filling Level the valve is fully closed.
Below this filling level the valve remains closed until the fill level required for the minimum
opening angle is reached. The valve then opens up to its minimum opening angle. When the
fill level falls further, the valve opens in a linear manner. At the Start Tank Filling Level the
valve is fully open. When the valve closes, it reaches its fully closed condition at the Stop
Tank Filling Level. The proportional valve is always opened and closed in increments in
accordance with the set Step Width for Valve Actuation (parameter 2-7-1-3-3). The step
width is scaled to the range between the Start Tank Filling Level und the Stop Tank Filling
Level. The Additional Start Tank Filling Level (parameter 2-7-1-2-12) and Additional Stop
Tank Filling Level (parameter 2-7-1-2-13) are the corresponding fill levels for an additional
inlet valve.
8.9.4 Drinking water protection
Drinking water
protection
Drinking Water Protection of the inlet line can be activated to meet hygiene requirements
(parameter 2-7-1-5-1). When the Maximum Time between Usage of Drinking Water
(parameter 2-7-1-5-2) is exceeded, the Response (parameter 2-7-1-5-3) will be either a
Message only or a Message and flushing of inlet line, depending on the configuration. For
the latter, the drinking water inlet valve will be opened for the Time for Flushing Drinking
Water Supply (parameter 2-7-1-5-4). Whether flushing is to be stopped in the event that the
overflow level is exceeded can be configured under Overflow if High-water Level is
Exceeded (parameter 2-7-1-5-5).
8.9.5 Rainwater filling
Rainwater filling
If the tank is to be filled with rainwater instead of drinking water, Rainwater Filling can be
Enabled (parameter 2-7-2-1-1) as an additional tank control function.
In this case, 1 or 2 Rainwater Pumps (parameter 2-7-2-2-5) are started up to pump
rainwater from a rainwater tank into the water storage tank. Dry running protection for the
rainwater pumps can be configured by selecting the Source for Dry Running Protection of
Rainwater Pump (parameter 2-7-2-2-1). The float switch in the rainwater tank must be
assigned a digital input (one of parameters 1-3-3-1 to 1-3-3-18). A Delay Time for Stop
(parameter 2-7-2-2-3) and Delay Time for Reset (parameter 2-7-2-2-4) have to be set.
Rainwater pumps only run for the configured Maximum Runtime (parameter 2-7-2-2-8). If
two pump sets are available, a pump changeover takes place after the Changeover Delay
(parameter 2-7-2-2-9). If a rainwater pump exceeds the Maximum Number of Pump Starts
per Hour (parameter 2-7-2-2-10), the rainwater pump is only started up again when the
number falls below the limit. Start Level for Rainwater Tank Filling and Stop Level for
Rainwater Tank Filling (parameters 2-7-1-2-17 and 2-7-1-2-18) have to be configured in
addition to the values for drinking water fill levels.
8.10 Special operating modes
8.10.1 Jockey pump system
Jockey pump system
For pressure booster systems required to handle a low water demand in addition to the
normal water demand, jockey-pump control can be used. First, a small jockey pump is
started up. When this pump no longer supplies enough water, a base load pump group
takes over the water supply. The jockey pump stops. It is only started again when the
pressure booster system has been stopped completely. The pump sets of both pump groups
are always pumps sets in mains operation. The Operating Mode (parameter 1-1-2-3) has to
