Viessmann Vitocal 222-S Installation And Service Instructions For Contractors page 9

Requirements for on-site connections
Indoor unit
677
600
A BC D E
FG
E
D
C
B
A H
110
450
375
300
225
150
A B
C D E
G
148
F
209
Fig. 1
Heating water return G 1
A
Cold water G (female thread)
B
¾
DHW circulation G
C ¾
DHW G (female thread)
D ¾
Heating water flow G 1
E
A
B
C
D
E
(female thread)
¼
(female thread)
(female thread)
¼
681
149
42
FG
H
Liquid line: Pipe 10 mm, thread UNF
F
7
Hot gas line: Pipe 16 mm, thread UNF
G
7
Cable entry:
H
■ LV leads < 42 V
■ Power cables 400 V~/230 V~
Preparing for installation
⅝
⅞
9