Dhw Heating In The Storage Tank Charging System - Samson TROVIS 5573 Mounting And Operating Instructions

Functions of the DHW circuit
6.2

DHW heating in the storage tank charging system

Start storage tank charging
VF
Fig. 10 · Schematics of a storage tank charging system
The controller begins charging the storage tank when the water temperature measured at sen-
sor SF1 falls below the DHW temperature set point by 0.1 °C. If the flow temperature in the sys-
tem exceeds the desired charging temperature, the controller tries to reduce the flow tempera-
ture in the heating circuit for up to 3 minutes before the exchanger charging pump is activated
together with the storage tank charging pump.
When there is no heating operation or when the flow temperature in the system is lower, the
exchanger charging pump is switched on immediately. If the temperature currently measured at
sensor SF1 is reached at sensor VF or after three minutes at the latest, the storage tank charging
pump is switched on.
If a storage tank thermostat is used, the storage tank charging pump is switched on when the
temperature T = Charging temperature – 5 °C is reached at sensor VF.
Note: Instead of the DHW temperature parameter, the Charging temperature can be adjusted
as the absolute value at the rotary switch if a storage tank thermostat is used.
When the flow sensor VF4 is activated, the set point in the heat exchanger circuit is influenced
by the system deviation in the storage tank charging circuit upon activation of the storage tank
charging pump: if the temperature measured at flow sensor VF4 is lower than the desired
charging temperature, the set point in the heat exchanger circuit is increased in steps of 1 °C.
When the set point in the heat exchanger charging circuit reaches the Max. charging tempera-
ture , the set point is no longer increased. An "Err 4" error messge is generated.
62
EB 5573 EN
SLP
TLP
TLP
WW
VF
SF1
SLP
SF1
ZP
SF2
SF2
ZP
KW
WW
KW
Heat exchanger
charging pump
Flow sensor
Storage tank charging pump
Storage tank sensor 1
Storage tank sensor 2
Circulation pump
Hot water
Cold water