Samson TROVIS 5573 - Page 126

16-44 EB 5573 EN
Appendix A (conguration instructions)
WiththesettingCO1',CO2'->F04-1,the'OTactivationvalueinratedoperation'parameter
is not used in the corresponding PA level.
Functions Default Conguration
Variable night set-back 0
CO1',CO2'->F04-1
(onlywhenCO1,CO2->F11-0)
5.0°C OTLnight100%:–50°Cto20.0°C
–15°C OTLday0%:–50°Cto+5.0°C
16.2.5 Buffer tank systems Anl 16.x
A heating characteristic based on a gradient or four entered points can be set in PA1 for the
buffer tanks in systems Anl 16.x. A buffer tank set point for day operation and a buffer tank
set point for night operation can be set without outdoor sensors in the customer level. An ex-
ternal demand transmitted from secondary controlled heating circuits, DHW circuit or an ex-
ternalrequest(overa0to10Vorbinarysignal)canoverridethecurrentbuffertankset
point. The maximum demand is indicated as the buffer tank set point for SF1. If the tempera-
ture falls below the buffer tank set point at SF1, charging of the buffer tank is started.
The set point of the charging temperature is determined by the 'Minimum set point to charge
buffer tank' parameter setting in the PA1 level. The automatic adaptation ('OT' setting) caus-
es the set point of the charging temperature to always be above the current buffer tank set
point by the value entered in 'Charging temperature boost'. Every other value entered in
'Minimum set point to charge buffer tank' is used as the minimum set point for the charging
temperaturewhichrststartstobevariableathigherbuffertanksetpoints.Whenareturn
owtemperaturesensorRüF1isused,thechargingpumpSLP(CO1->F22-1)isrstre-
leased to avoid cold charging when the temperature measured at RüF1 has reached the
sametemperaturemeasuredatSF1.AnactivatedsettingCO1'->F03-1(dischargingpro-
tection) 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.
TheCO1'->F03-1settingcausesa2°Chigherchargingsetpointtobecalculated.The
following then applies:
Charging set point= Set point at SF1 + 'Charging temperature boost' + 2°C
The'Stopchargingofthebuffertank'parameter(PA1,default=OT)determinesunderwhich
conditions the charging of the buffer tank is stopped. The automatic adaptation ('AT' setting)
causes the buffer tank charging to be stopped when the temperature in the buffer tank reach-