Viessmann VITOCAL 242-G Installation And Service Instructions Manual page 193

Overview of the PCBs and connection options
Note
No physical layout is shown.
A Main PCB
B Programming unit
C Optolink interface
D Sensors
E Stepper motor (internal)
F Sensors and control inputs
G Power supply unit
H Instantaneous heating water
heater
K Compressor with control
L Primary pump
M Auxiliary PCB
N Impressed current anode
O Secondary pump
Connection and wiring diagrams
P Solar circuit pump (only for the
Vitocal 242)
R Cylinder primary pump
S Safety chain
T Main connecting area in control
panel 400/230 V
U Control module with phase moni-
tor
V Full wave soft starter (subject to
load)
X60 Main connection area for exter-
nal connections on the control
panel
193