Viessmann Vitocal 222-S Installation And Service Instructions For Contractors page 28

Installation sequence
Connecting the refrigerant lines
2. Flare the pipe ends of the refrigerant lines.
or
Braze the solder connection of the Euro flanged
adaptors (accessories) using shielding gas.
3. Secure the refrigerant lines. Tighten the nuts with
the torques shown in the following table.
Torque for refrigerant lines
Type AWBT(-M), Line
AWBT(-M)-E-AC
221.C04 Liquid line
221.C06
Hot gas line
221.C08 Liquid line
221.C10
Hot gas line
221.C13
221.C16
Connecting the secondary circuit
Preparing connections on the heating water side
Equip the heating system on site with an expansion
vessel in the heating return.
The expansion vessel must be approved to EN 13831.
28
(cont.)
4. Apply thermal and vapour diffusion-proof insulation
6 mm
7
12 mm
7
10 mm
7
16 mm
7
Note
■
■
to the refrigerant lines.
Connection to the
outdoor unit
UNF
⅝
with reducer
x ⁷⁄₁₆
⅝
UNF
⅞
with reducer
x
⅞ ¾
UNF
⅝
UNF
⅞
With underfloor heating circuits, install a temperature
limiter to restrict the maximum temperature of under-
floor heating systems.
Ensure the minimum flow rate, e.g. by means of an
overflow valve: See "Specification".
Torque in Nm
33 to 42
14 to 18
63 to 77
50 to 62
33 to 42
63 to 77