Viessmann VITOCAL 242-S Installation And Service Instructions Manual page 33

Connecting refrigerant lines
2x
6.
Tighten the 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
(cont.)
6. Type AWT-AC 241.A04:
■ Slide the supplied union nuts
(⁷⁄₁₆ UNF for liquid line, ¾ UNF for
hot gas line) over the refrigerant
lines from the external unit.
■ Flare the refrigerant lines from the
external unit.
■ Connect the supplied reducers
with copper sealing ring to the
connection pieces (twin connec-
tors).
■ Secure the refrigerant lines from
the external unit onto the reducers,
using the union nuts.
Type AWT-AC 241.A07 to A13,
B10, B13:
■ Slide the supplied union nuts
(⅝ UNF for liquid line, ⅞ UNF for
hot gas line) over the refrigerant
lines from the external unit.
■ Flare the refrigerant lines from the
external unit.
■ Secure the refrigerant lines from
the external unit onto the connec-
tion pieces, using the union nuts.
Connection
to internal
unit
⅝ UNF
with reducer
⅝ x ⁷⁄₁₆
⅞ UNF
with reducer
⅞ x ¾
⅝ UNF
⅞ UNF
⅝ UNF
⅞ UNF
Installation sequence
Torque in Nm
14 to 18
50 to 62
33 to 42
63 to 77
33 to 42
63 to 77
33