Viessmann VITOCAL 222-S Installation And Service Instructions Manual page 40

Installation sequence
Connecting refrigerant lines
2x
6.
Tighten nuts with the following torques:
Type AWT-AC Line
221.A04 Liquid line 7 6 mm
Hot gas line 7 12 mm
221.A07 Liquid line 7 10 mm
Hot gas line 7 16 mm
221.A10 Liquid line 7 10 mm
Hot gas line 7 16 mm
40
(cont.)
6. Type AWT-AC 221.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 nipple).
■ Secure the refrigerant lines from
the external unit with union nuts to
the reducers.
Type AWT-AC 221.A07, A10 and
A13:
■ Slide the supplied union nuts
(⅝ UNF for liquid line, ⅞ UNF for
hot gas line) over the open end of
the refrigerant lines from the exter-
nal unit.
■ Flare the refrigerant lines from the
external unit.
■ Secure the refrigerant lines from
the external unit with union nuts at
the connection pieces.
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
Torque in Nm
14–18
50–62
33–42
63–77
33–42
63–77