Viessmann VITOCAL 242-S Installation And Service Instructions Manual page 29

Connecting refrigerant lines
Type AWT-AC 241.A07 to A13,
B10, B13:
Replace nuts with union nuts sup-
plied (internal unit):
■ ⅝ UNF for liquid line
■ ⅞ UNF for hot gas line
Tighten nuts with the following torque:
Type AWT-AC Cable
241.A04 Liquid line 7 6 mm
Hot gas line 7 12 mm
241.A07 Liquid line 7 10 mm
Hot gas line 7 16 mm
241.A10 Liquid line 7 10 mm
Hot gas line 7 16 mm
241.A13 Liquid line 7 10 mm
Hot gas line 7 16 mm
241.B10 Liquid line 7 10 mm
Hot gas line 7 16 mm
241.B13 Liquid line 7 10 mm
Hot gas line 7 16 mm
Connection to the internal unit
Note
We recommend using the pipe bends
supplied for connecting the refrigerant
lines. Depending on the installation con-
ditions, it may also be possible to con-
nect the refrigerant lines directly without
bends.
(cont.)
3. Flare the pipe ends.
4. Secure the pipes.
Connection
to external
unit
⁷⁄₁₆ UNF
Installation sequence
Torque in Nm
14 to 18
¾ UNF 50 to 62
⅝ UNF 33 to 42
⅞ UNF 63 to 77
⅝ UNF 33 to 42
⅞ UNF 63 to 77
⅝ UNF 33 to 42
⅞ UNF 63 to 77
⅝ UNF 33 to 42
⅞ UNF 63 to 77
⅝ UNF 33 to 42
⅞ UNF 63 to 77
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