Viessmann Vitocal 242-S Installation And Service Instructions Manual page 7

Requirements regarding on-site connections
Internal unit
600
475
62
Fig. 1
Opening for LV leads < 42 V
A
DHW
B
DHW circulation
C
Opening for 230 V cables
D
Cold water
E
Liquid line
F
111
61
405
147
69
300
387
680
Hot gas line
G
Heating water flow
H
Heating water return
K
Solar circuit return
L
Solar circuit flow
M
Preparing for installation
7