Viessmann VITOCAL 300-G Installation And Service Instructions Manual page 229

Overview of the PCBs and connection options
Plug Sensor
F6 Cylinder temperature sensor, top
Connect on site
F8 Flow temperature sensor, secondary circuit
Factory connection
F9 Return temperature sensor, secondary circuit for heat
pump stage 1 (type BW)
Factory connection
F12 Flow temperature sensor, heating circuit with
mixer (M2)
Connect on site
F13 System flow temperature sensor (with sensor well, down-
stream of the heating water buffer cylinder)
Connect on site
F14 Flow temperature sensor, cooling circuit (direct heating
circuit A1 or separate cooling circuit)
Connect on site
F16 Room temperature sensor, separate cooling circuit
Connect on site
F18 Return temperature sensor, secondary circuit for heat
pump stage 2 (type BWS)
Connect on site
F20 Boiler temperature sensor, external heat source
Connect on site
Connection and wiring diagrams
(cont.)
Type
Pt 500
Pt 500
Pt 500
Ni 500
Pt 500
Ni 500
Ni 500
Pt 500
Pt 500
229