Viessmann AWT 221.A04, Installation And Service Instructions For Contractors

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26
Tighten nuts with the following torque:
Type AWT/AWT-AC
Line Connection to the
outdoor unit Torque in Nm
221.A04 Liquid line
7
6 mm
⁷
⁄
₁₆
UNF 14 to 18
Hot gas line
7
12 mm
¾
UNF 50 to 62
221.A05 Liquid line
7
10 mm
⅝
UNF 33 to 42
Hot gas line
7
16 mm
⅞
UNF 63 to 77
221.A07 Liquid line
7
10 mm
⅝
UNF 33 to 42
Hot gas line
7
16 mm
⅞
UNF 63 to 77
221.A10 Liquid line
7
10 mm
⅝
UNF 33 to 42
Hot gas line
7
16 mm
⅞
UNF 63 to 77
221.A13 Liquid line
7
10 mm
⅝
UNF 33 to 42
Hot gas line
7
16 mm
⅞
UNF 63 to 77
221.B10 Liquid line
7
10 mm
⅝
UNF 33 to 42
Hot gas line
7
16 mm
⅞
UNF 63 to 77
221.B13 Liquid line
7
10 mm
⅝
UNF 33 to 42
Hot gas line
7
16 mm
⅞
UNF 63 to 77
221.B16 Liquid line
7
10 mm
⅝
UNF 33 to 42
Hot gas line
7
16 mm
⅞
UNF 63 to 77
Connection to indoor unit
Note
For connecting the refrigerant lines, we recommend
the use of either the pipe bends supplied or the refrig-
erant lines connection set (accessories). Depending on
the installation 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.
Point the pipe openings downwards or tempora-
rily plug them.
Note
■ The refrigerant lines of the indoor 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
Connecting the refrigerant lines
(cont.)
5776 028 GB
Installation