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Parameters
WE
Parameter level / Range of values
Charging temperature boost***
10 °C
PA4 / 0 to 50 °C
Lag of storage tank charging pump
0.5
PA4 / 0.1 to 10.0
Sustained DHW temperature
40 °C
PA4 / 20 to 90 °C
*
Parameters serve as limitation of the adjustment range for the DHW temperature to be set
at the rotary switch
** Deactivation value T =
DHW temperature
+
hysteresis
*** Charging temperature T =
DHW temperature
+
charging temperature boost
6.1.1 DHW circuit additionally controlled by a globe valve
In systems Anl 7.1, 8.1 and 11.1, the following version with globe valve can be configured
instead of the three-way valve control in the DHW circuit:
Globe valve and temperature sensor VF2 are used exclusively for return flow temperature
limitation in the schematics shown above. The pre-control circuit provides at least the same
flow temperature as in the standard schematic version which is calculated from
DHW tem-
perature set point + Charging temperature boost + Boost set point of primary exchanger
control.
The functions and parameters of the DHW heating in the storage tank system are upgraded
by the following settings:
Function
WE
Configuration
DHW circuit additionally controlled by a
globe valve
0
CO4 -> F20 - 1
Parameter
WE
Parameter level / Range of values
Maximum return flow temperature
65 °C
PA4 / 20 to 90 °C
EB 5576 EN
63
Functions of the DHW circuit
KW
WW
SF1
VF2
ZP
SLP
Rk2/Y2
Fig. 9 · Schematics of a storage tank system with a globe valve for return flow temperature limitation
RK2/Y2
Control circuit/valve 2
SLP
Storage tank charging
pump
SF1
Storage sensor 1
VF2
Flow sensor 2
ZP
Circulation pump
WW
Hot water
KW
Cold water