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EQJW146F002 EN
Functions of the DHW circuit
7 Functions of the DHW circuit
7.1 DHW heating in the storage tank system
Start storage tank charging
KW
WW
SF1
ZP
SLP
SLP Storage tank charging pump
SF1 Storage tank sensor 1
ZP
Circulation pump (DHW)
WW Hot water
KW
Cold water
Fig. 5: Schematics of a storage tank system
The controller begins charging the storage tank when the water temperature measured at
storage tank sensor 1 falls below the 'DHW temperature set point' by 0.1 °C. If the flow tem-
perature in the system exceeds the desired charging temperature, the controller tries to re-
duce the flow temperature in the heating circuit for up to three minutes before the storage
tank charging pump is activated. When there is no heating operation or when the flow tem-
perature in the system is lower, the storage tank charging pump is switched on immediately.
If the function CO4 > F15 - 1 (SLP ON depending on return flow temperature) is activated,
the primary valve is opened without simultaneously operating the storage tank charging
pump. The storage tank charging pump is first switched on when the primary return flow
temperature has reached the temperature currently measured at storage tank sensor 1. This
function enables storage tank charging when the heating system is switched off, e.g. in sum-
mer mode, without cooling down the storage tank first by filling it with cold flow water.The
storage tank charging pump does not start operation before a sufficiently high temperature
has been reached at the heat exchanger.
The 'DHW temperature set point' is to be regarded in relation to the charging temperature if
a storage tank thermostat is used.
Note
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