S1 Vivaldi II Owner’s ManualPage 226.4 Control Panel Connection Diagram6.5 Wiring Diagram DefinitionsEV GR Coffee brewing group solenoid valveEV H Hot water delivery solenoid valveEV AL Automatic refill system solenoid valveT1 Connection on control board of the triac that feeds the boiler heating elementT2 Connection on control board of the triac that feeds the group heating elementP1 Connection of the control board on the triac that feeds the boiler heating elementP2 Connection of the control board on the triac that feeds the group heating elementSER 1 Connection control panel on control boardSER 2 Connection control board on control panelF Flow meterF1 in Phase inlet into the triac that feeds the boiler heating elementF2 out Phase outlet from the triac that feeds the boiler heating elementF2 in Phase inlet into the triac that feeds the group heating elementF2 out Phase outlet from the triac that feeds the group heating elementS1 Boiler temperature probeS2 Brewing group temperature probeSL Boiler water level controlSB Only used on the VII Mini ModelsV Ventilator connection (boiler triac cooling fan)MP Motor pumpRC Heating element brewing groupTSC Safety thermostat for brewing group heating elementRB Boiler heating elementTSB Safety thermostat for boiler heating elementJP4 15/20A Mode Selector ConnectionJP3 Optional Timer Switch ConnectorSD Optional Timer On/Off SwitchSE 15/20A Mode Switch