Viessmann Vitocal 242-S Installation And Service Instructions Manual page 8

Preparing for installation
Requirements regarding on-site connections
Connection sizes for hydraulic connections
Pos. Sym- Meaning
bol
DHW
B –
DHW circulation
C –
Cold water
E
–
Liquid line
F
Hot gas line
G
Heating water flow
H
K Heating water return
Solar circuit return
L –
Solar circuit flow
M –
1. Prepare the connections on the heating water and
the DHW side.
Flush the heating system.
Cable lengths in the internal/external unit plus wall clearance
Cables
Power cables
Heat pump control unit 230 V~
■
Compressor 230 V~/400 V~
■
Other connecting cables
230 V~, e.g. for circulation pumps
■
< 42 V, e.g. for sensors
■
BUS cable for internal/external unit
12 V
■
43 V
■
8
(cont.)
Connection to the internal unit
Type AWT/AWT-AC Pipe
241.A04
241.A05 to A13
241.B10 to B16
241.A04
241.A05 to A13
241.B10 to B16
DN 20 pipe sleeve for multi connect system
2. Prepare the electrical connections.
Internal unit
2.0 m
2.0 m
2.0 m
2.5 m
2.5 m
UNF thread
7
6 mm
(Reducer
x ⁷⁄₁₆ supplied)
⅝
10 mm
10 mm
12 mm
(Reducer
x supplied)
⅞ ¾
16 mm
16 mm
Cu 28 x 1 mm
Cu 28 x 1 mm
External unit
—
Rp
¾
G 1
Rp
¾
⅝
⅝
⅝
⅞
⅞
⅞
—
1.5 m
—
—
1.5 m
1.5 m