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[Hot water tank] function block – SH & TWIN Configuration parameter
6.4 [Hot water tank] function block –
SH & TWIN
Parameters to be set
Set or check the following parameters.
Detailed descriptions of the parameters are provided
below.
Explanation of [Switch-on diff.]
This parameter regulates how far the current warm
water temperature can fall before the hot water tank
again demands heat from the buffer or boiler.
If the value is set to 15 °C, the current hot water
temperature may drop by 15 °C from the value
[Hot water tank target]. The hot water tank only
demands heat from the buffer or boiler when this
happens.
Explanation of [HW bottom off]
Optional: only with additional [Hot water tank bottom]
temperature sensor
This parameter defines when charging of the hot water
tank will end. As soon as the additional [Hot water tank
bottom] temperature sensor in the hot water tank
reaches the adjustable [HW bottom off] temperature,
charging of the hot water tank ends.
Explanation of [Flow temp raise]
The target temperature of the hot water tank [Hot water
tank target] is increased by this value and demanded
from the heat producer.
Example:
[Hot water tank target] = 50 °C
[Flow temp raise] = 5 °C
=> 55 °C is demanded from the heat producer.
Explanation of [Enable temperature]
Minimum temperature of the heat producer (buffer or
boiler) for enabling the hot water charging pump.
If the buffer is the heat producer for the hot water
tank, the factory setting is 35 °C. If the boiler is the
heat producer, the setting is 58 °C.
Explanation of [Register performance]
This parameter indicates the heat capacity of the
register in the hot water tank. The factory setting is
calculated with 70% of the boiler's rated output.
Example: Boiler with rated output of 25 kW results in
a register output of 17.5 kW.
If the register output of the installed hot water tank is
known, this value must be set. For single family
homes, this value is usually between 15 and 20 kW.
If the exact register output is not known, use the
following estimates for parameter [Register per-
formance]:
• At a rated boiler output of 15 kW, use the rated
boiler output as the register output.
• If the rated boiler output is above 15 kW, select ap-
proximately 20 kW.
It is important that this parameter is checked and
adjusted because if the value is too high, output
regulation of the boiler or buffer, respectively, will be
impaired.
Explanation of [Hot water tank max.]
This parameter defines the maximum temperature of
the hot water tank, and applies to all heat producers -
including solar heating systems - that charge the hot
water tank.
Hot water tank
Switch-on diff.
HW bottom off
Flow temp raise
Enable temperature
Register performance
Hot water tank max.
Sol. chg. until
Solar heat diss.
Priority
Circulation
Circulation runtime
Circulation pause
Enable circulation
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