Viessmann VITOCAL 222-S Installation And Service Instructions Manual page 27

Connecting refrigerant lines
2x
5.
Fig. 19
2x
6.
Fig. 20
Tighten the nuts with the following torque:
Type AWT/AWT-AC Line
221.A04 Liquid line
Hot gas line
221.A05 Liquid line
Hot gas line
(cont.)
5. Flare the pipe bends on their open end and secure
6. Type AWT/AWT-AC 221.A04:
6 mm
7
12 mm
7
10 mm
7
16 mm
7
connection piece (twin connector) with union nuts.
Note
■ Flare the pipe end of the hot gas line by
approx. 0.5 mm.
Connection pieces must not be skewed. Check
■
the flared connections for firm seating.
Slide the supplied union nuts (⁷⁄₁₆ UNF for liquid
■
line, UNF for hot gas line) over the refrigerant
¾
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
connectors).
Secure the refrigerant lines from the external unit
■
to the reducers using the union nuts.
Type AWT/AWT-AC 221.A05 to A13, 221.B10 to
B16:
■ Slide the supplied union nuts (
line, UNF for hot gas line) over the refrigerant
⅞
lines from the external unit.
Flare the refrigerant lines from the external unit.
■
■ Secure the refrigerant lines from the external unit
to the connection pieces using the union nuts.
Connection to in-
ternal unit
UNF
⅝
x ⁷⁄₁₆
with reducer
⅝
UNF
⅞
with reducer x
⅞ ¾
UNF
⅝
UNF
⅞
Installation sequence
UNF for liquid
⅝
Torque in Nm
14 to 18
50 to 62
33 to 42
63 to 77
27