Samson TROVIS 5573 - Page 149

EB 5573 EN 16-67
Appendix A (conguration instructions)
Frost protection operation of a pump, a heating circuit or the DHW circuit is only active when
the
frost protection icon is displayed. In the stand-by mode ( ) xed set point control with-
out outdoor temperature sensor does not include frost protection.
16.4.3 Forced pump operation
When the heating circuit pumps have not been activated for 24 hours, forced operation of
thepumpsisstartedbetween12.02hand12.03h.Thisisdonetoavoidthatthepumpsget
stuck when they are not operated for long periods of time. In the DHW circuit, the circulation
pumpisoperatedbetween12.04hand12.05h,theotherpumpsbetween12.05hand
12.06h.
16.4.4 Return ow temperature limitation
Thetemperaturedifferencebetweentheowandreturnowinanetworkindicateshowwell
theenergyisused:thegreaterthedifference,thehighertheefciency.Areturnowsensor
issufcienttoevaluatethetemperaturedifferencewhentheowtemperaturesarepre-
dened.Thereturnowtemperaturecanbelimitedeithertoavaluedependingontheout-
doortemperature(variable)ortoaxedsetpoint.Whenthetemperaturemeasuredatreturn
owsensorRüFexceedsthereturnowtemperaturelimit,thesetpointoftheowtempera-
ture(owtemperatureoftheheatingsystem,chargingtemperature)isreduced.Thiscauses
theprimaryowratetobereducedandthereturnowtemperaturetodrop.Insystems
Anl2.xand4.1,the'Max.returnowtemperature'parameter(PA4level)isusedforlimita-
tion in the primary circuit during DHW heating if it is greater than the parameter valid for
the primary circuit. The 'Limiting factor KP' determines how strongly the controller responds
when the limits are exceeded in either direction (PI algorithm).
Ifjusttheproportionalcomponentistobeimplemented,setCO5->F16-1.Thisallowsthe
integral-actioncomponentinthereturnowtemperaturelimitationalgorithmofallcontrol
circuitsofthecontrollertobedeactivated.Thesetpointreading(owtemperatureofthe
heating,chargingtemperature)blinkstoindicatethatareturnowlimitationisactiveinthe
control circuit concerned.
Note