Connection To The Internal Unit - Viessmann VITOCAL 222-S Installation And Service Instructions Manual

Connecting refrigerant lines
Tighten nuts with the following torque:
Type AWT/AWT-AC Line
221.A04 Liquid line
Hot gas line
221.A05 Liquid line
Hot gas line
221.A07 Liquid line
Hot gas line
221.A10 Liquid line
Hot gas line
221.A13 Liquid line
Hot gas line
221.B10 Liquid line
Hot gas line
221.B13 Liquid line
Hot gas line
221.B16 Liquid line
Hot gas line

Connection to the internal unit

Note
We recommend using the pipe bends supplied for con-
necting the refrigerant lines. Depending on the installa-
tion conditions, it may also be possible to connect the
refrigerant lines directly without bends.
!
Please note
Contamination (e.g. metal swarf) or moisture in
the copper pipes of the refrigerant lines will
cause the appliance to malfunction.
Hold the pipe openings downwards or tempora-
rily plug them.
(cont.)
6 mm
7
12 mm
7
10 mm
7
16 mm
7
10 mm
7
16 mm
7
10 mm
7
16 mm
7
10 mm
7
16 mm
7
10 mm
7
16 mm
7
10 mm
7
16 mm
7
10 mm
7
16 mm
7
Note
■
■
Connection to ex-
ternal unit
⁷⁄₁₆ UNF
UNF
¾
UNF
⅝
UNF
⅞
UNF
⅝
UNF
⅞
UNF
⅝
UNF
⅞
UNF
⅝
UNF
⅞
UNF
⅝
UNF
⅞
UNF
⅝
UNF
⅞
UNF
⅝
UNF
⅞
The refrigerant lines of the internal unit are charged
with nitrogen; positive pressure 2 bar (0.2 MPa).
If Euro flanged adaptors are used, braze the solder
connections using a shielding gas.
Installation sequence
Torque in Nm
14 to 18
50 to 62
33 to 42
63 to 77
33 to 42
63 to 77
33 to 42
63 to 77
33 to 42
63 to 77
33 to 42
63 to 77
33 to 42
63 to 77
33 to 42
63 to 77
25