ST-408N – user's manual
III.d) Operation modes
In this function the user may choose one of the three operation modes
available.
III.d.1) Water boiler priority
In this mode, the DHW pump is activated first and it operates until the set
DHW temperature is reached (the valves close completely and the valve pumps are
switched off). After the set temperature has been reached, the pump is switched off
and the mixing valves are activated (along with the pumps – according to their
settings).
The valves operate continuously until the water boiler temperature drops
below the set value minus hysteresis. Then, the valve pumps are switched off and
the DHW pump is switched on.
III.d.2) Parallel pumps
In this mode, all active pumps and valves operate simultaneously. The valves
maintain the set temperature and the water boiler is heated to the set temperature.
III.d.3) Summer mode
In this mode, the CH valves are closed to prevent unnecessary house heating. In the
case when the CH boiler temperature is too high, the valve will b e opened as an
emergency procedure (requires activation of return protection!)
In this mode the water boiler pump and the floor valves operate normally
according to their settings.
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