Viessmann Vitocal 300-G Installation And Service Instructions Manual page 183

PCB 3: Sensors and KM BUS
e¢I Flow, cooling (heating circuit or
separate cooling circuit)
Connection markings
Terminal strip X1:
Terminals 3X1.1 to 3X1.27
Terminal strip X2:
Terminals 3X2.1 to 3X2.27
Sensor / KM BUS
Outside temperature sensor
Primary flow, internal
Primary return, internal
Heating water buffer cylinder
DHW cylinder, top
DHW cylinder, bottom
Secondary flow temperature sen-
sor, internal
Secondary return temperature
sensor, internal
Flow temperature sensor, heating
circuit with mixer M2
System flow temperature sensor
(with sensor well, downstream of
the heating water buffer cylinder
or external heat source)
Flow temperature sensor, cooling
in the direct heating circuit A1 or
separate cooling circuit
Room temperature sensor, sepa-
rate cooling circuit
Sensor, external heat source
Connection and wiring diagrams
(cont.)
e¢O Room temperature sensor, cool-
ing circuit
eYP External heat source
For PCB overview, see from page 61.
Note
"Internal" sensors are partially (sub-
ject to appliance version) connected
already. In that case, connect no
further sensors to these terminals:
F2, F3, F8, F9, F17, F18, F21, F23
Connect nothing to the following
terminals; these are solely intended
for internal use:
F1, F5, F10, F11, F15, F19, F22
Type ID Connection
Ni 500 F0 3X1.16 / 3X2.16
Pt 500 F2 3X1.24 / 3X2.24
Pt 500 F3 3X1.23 / 3X2.23
Pt 500 F4 3X1.22 / 3X2.22
Pt 500 F6 3X1.14 / 3X2.14
Pt 500 F7 3X1.13 / 3X2.13
Pt 500 F8 3X1.20 / 3X2.20
Pt 500 F9 3X1.19 / 3X2.19
Ni 500 F12 3X1.10 / 3X2.10
Pt 500 F13 3X1.9 / 3X2.9
Ni 500 F14 3X1.8 / 3X2.8
Ni 500 F16 3X1.6 / 3X2.6
Pt 500 F20 3X1.4 / 3X2.4
183