VITOTRONIC 100, HC1 VITOCONTROL-S, WB2B Installation and ...

Installation – Vitocontrol-S, WB2BConnection of external contacts143 146ABCDry Contacts:A External heating programchangeover/external“Mix.valve open”B External blocking/external“Mix.valve closed”C External demandA External heating programchangeover or ”Mix.valve open”Contact closed:The manually pre-selected heatingprogram can be modified via thiscontact, (see table below) enabling themixing valves to be opened.The “Mix.valve open” function can beallocated via coding address “9A”, andthe heating program changeover can beallocated to the heating circuits viacoding address “91”.B External disable/external“Mix.valve close”Closing the zero volt contact causesthe burner to shut down or the mixerto be closed.Allocated boiler circuit pumps areswitched OFF and shut-off valves areclosed.WARNINGHeating circuits are no longer frostprotected during “Mix.valve close”. Alower boiler water temperature is notmaintained during external blocking.Via coding address “99”, you candetermine what input aVD shouldaffect.C External demandClosing the dry contact starts the boilerburners of the individual boilers subjectto load via a set supply temperature(coding address “9b”) on Vitocontrol-S,WB2B.The supply temperature is limited viathe set min. and max. supplytemperature.Manually pre-selectedheating program(with open contact)9orworRoom heating OFF/DHW OFFRoom heating OFF/DHW ONrw Room heating ON/DHW ONCoding 2d5: 0(factorydefault)Changed heating program(with closed contact) Continuous operation with reduced room temperature/DHW OFFd5: 1 Continuous operation with normal room temperature/DHW inaccordance with coding address “64”5414 553 v1.422