Samson TROVIS 5573 - 16.3 Functions of the DHW circuit

16-54 EB 5573 EN
Appendix A (conguration instructions)
16.3 Functions of the DHW circuit
16.3.1 DHW heating in the storage tank system
Start storage tank charging
KW
WW
SF1
ZP
SLP
SLP Storage tank charging pump
SF1 Storage tank sensor
ZP Circulation pump (DHW)
WW Hot water
KW Cold water
Fig.16-5: Schematics of a storage tank 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owtemperaturein
thesystemexceedsthedesiredchargingtemperature,thecontrollertriestoreducetheow
temperature in the heating circuit for up to three minutes before the storage tank charging
pumpisactivated.Whenthereisnoheatingoperationorwhentheowtemperatureinthe
system is lower, the storage tank charging pump is switched on immediately.
IfthefunctionCO4->F15-1(SLP ON depending on return ow temperature) is activated,
the primary valve is opened without simultaneously operating the storage tank charging
pump.Thestoragetankchargingpumpisrstswitchedonwhentheprimaryreturnow
temperature has reached the temperature currently measured at storage tank sensor SF1.
This function enables storage tank charging when the heating system is switched off, e.g. in
summermode,withoutcoolingdownthestoragetankrstbyllingitwithcoldowwater.
Thestoragetankchargingpumpdoesnotstartoperationbeforeasufcientlyhightempera-
turehasbeenreachedattheheatexchanger.AnactivatedsettingCO4'->F03-1(dis-
charging protection) causes the charging to be stopped when the charging temperature does
not reach its set point even though the valve is fully open or it falls below the temperature
measured at SF1 and does not rise again. Charging with the valve fully open is stopped after
one hour at the latest.