Parameters
WE
Parameter level / Range of values
DHW demand ON
40 °C
PA4 / 20 to 90 °C
DHW demand OFF
45 °C
PA4 / 20 to 90 °C
Charging temperature
55 °C
PA4 / 20 to 90 °C
Heat exchanger charging pump
deactivation limit
50 °C
PA4 / 20 to 90 °C
Storage tank charging pump
deactivation limit
50 °C
PA4 / 20 to 90 °C
Maximum charging temperature
120 °C PA4 / 20 to 120 °C
6.2 DHW heating in the storage tank system
Start storage tank charging
The controller can be reconfigured for all systems with DHW heating to control a DHW storage
tank with heating register (storage tank system).
The controller switches the storage tank charging pump (SLP) on and off and controls the mixing
valve for the DHW circuit. A mixing valve in the DHW circuit does not exist in system Anl 2. The
sensor VFS is connected to terminal 28 and the storage tank charging pump to terminal 45.
The controller starts the storage tank charging when the water temperature measured at sensor
SF1 falls below the
DHW demand ON by 0.1 °C. If the flow temperature in the system is higher
than the required charging temperature, the controller attempts to reduce it in the heating circuit
for maximum three minutes before the storage tank charging pump starts to run.
54
EB 5179 EN
Appendix
VL
RL
SLP VFS
ZP
KW
Zirk.
TW
SF1
Fig. 6 · DHW heating in storage tank system, applies to systems Anl 4, 5, 7, 8, 9 and 10
Anl 2: without three-way valve
SLP
Storage tank charging
pump
SF1
Storage sensor 1
VFS
Flow sensor
ZP
Circulation pump
KW
Cold water
TW
Domestic hot water (DHW)
VL
Flow
RL
Return flow
