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6.2 DHW heating in the storage tank charging system
Start storage tank charging
The controller begins charging the storage tank when the water temperature measured at sen-
sor SF1 falls below the set point
DHW heating ON
or the temperature adjusted at the storage
tank thermostat:
DHW heating from the secondary circuit (Anl 3, 8):
If the flow temperature of the system is higher than the required charging temperature, the con-
troller tries to reduce the temperature on the heating circuit side three minutes at the maximum
before the storage tank charging pump starts. If heating operation is not taking place or the
flow temperature in the system is lower, thestorage tank charging pump is switched on immedi-
ately. If the currently measured temperature at sensor VF is reached, the storage tank charging
pump is switched on.
DHW heating from the primary circuit (Anl 5, 11):
The storage tank charging pump (Anl 5) or the heat exchanger charging pump (Anl 11) is
started immediately. The controller regulates the temperature to the
Charging temperature
.
Note!
In systems Anl 3, 8 and 11, the charging temperature in the storage tank charging circuit is re
-
gulated over the flow sensor VF3 when it is activated on switching on the storage tank charging
pump.
The heat exchanger inlet temperature ismonitored at sensor VF1 (Anl 3) or VF2. Ifit reaches the
Heat exchanger inlet temperature limit
, the limit is used as thebasis for the set point for the follo
-
wing heat exchanger inlet temperature control.
EB 5476 EN 51
Functions of the DHW circuit
Fig. 5 · DHW heating in a storage tank charging system
SF1 Storage tank sensor 1
SF2 Storage tank sensor 2
SLP Storage tank charging pump
VF Flow sensor
TLP Heat exchanger charging pump
ZP Circulation pump
KW Cold water
WW Hot water