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| Functions of the DHW circuit |
6 | Functions of the DHW circuit |
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6.1 DHW heating in the storage tank system |
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| SLP | Storage tank charging pump |
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| SF1 | Storage sensor 1 |
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| ZP | Circulation pump |
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| KW | Cold water |
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| WW | Hot water |
Fig. 4 · DHW heating in a storage tank 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 2, 7, 9):
If the flow temperature of the system (in system Anl 9: of the radiator circuit) is higher than the required charging temperature, the controller tries to reduce the temperature in the heating cir- cuit side for three minutes at the maximum before the storage tank charging pump starts to op- erate.
If the flow temperature of the system is lower than the required charging temperature, the charging pump first start to run when the temperature at the affected flow sensor reaches the temperature currently measured at sensor SF1 or the flow temperature could be raised at least by 10 K.
If heating operation is not taking place, the storage tank charging pump is switched on immedi- ately.
Note!
The function block setting FB20 = ON provides two switching conditions for the storage tank charging pump (SLP) that can be
(1)SLP switched on regardless of the return flow temperature
(2)SLP switched on depending on the return flow temperature
EB 5476 EN 49
