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

Functions of the DHW circuit

7.2 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
sensor SF1 falls below the 'DHW temperature set point' by 0.1 °C. If the flow temperature in
the system exceeds the desired charging temperature, the controller tries to reduce the flow
temperature in the heating circuit for up to three 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 the 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 the sensor VF.
Note
When a storage tank thermostat is used, the 'Charging temperature' parameter can be ad-
justed at the rotary switch as the absolute value instead of the 'DHW temperature' parame-
ter.
When the flow sensor VF4 is activated, the set point in the heat exchanger circuit is influ-
enced by the system deviation in the storage tank charging circuit upon activation of the stor-
age 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
78
SLP
TLP
WW
SF1
ZP
SF2
KW
TLP Heat exchanger
charging pump
VF Flow sensor
SLP Storage tank charging
pump
SF1 Storage tank sensor 1
SF2 Storage tank sensor 2
ZP Circulation pump (DHW)
WW Hot water
KW Cold water
EB 5573 EN