Pcb, Extension For Heating Circuits 2 And 3 With Mixer - Viessmann VITOTRONIC 300 Installation And Service Instructions Manual

Vitotronic 300
(cont.)
Outside temperature sensor
!
Boiler water temperature sensor
§
Cylinder temperature sensor
%A
or
Top cylinder temperature sensor in a cyl-
inder loading system
Cylinder temperature sensor (bottom) in
%B
a cylinder loading system
/ Common flow temperature sensor
) ?
Flue gas temperature sensor
aG
Therm-Control temperature sensor
aJA
or
Return temperature sensor T1
Temperature sensor cylinder loading sys-
aJB
tem
or
Return temperature sensor T2

PCB, extension for heating circuits 2 and 3 with mixer

Fig. 51
Flow temperature sensors
?
Heating circuit pumps
sÖ
Power supply
fÖ
Connection and wiring diagrams
CAN bus subscriber
jS
.1/ .2 External blocking boiler
aVD aVD
.2/ .3 Start the boiler externally as the last one
aVD aVD
in the boiler sequence
KM-BUS subscriber
aVG
aVH .1/ aVH .2 External changeover, stepped/modulating
boiler burner
.2/ .3 External system demand
aVH aVH
Data exchange port
X Electrical interfaces
Mixer motors
gS
K1-K6 Relay
X Electrical interfaces
153