Evacuating The Refrigerant Lines And Internal Unit - Viessmann VITOCAL 222-S Installation And Service Instructions Manual

Commissioning, inspection, maintenance

Evacuating the refrigerant lines and internal unit

!
Please note
Commissioning is weather-dependent. At out-
side temperatures below 0 °C, moisture can
condense and sublimate in the refrigerant lines.
If water droplets and/or ice particles enter the
compressor, they may cause damage to the
appliance.
In the case of high relative humidity or outside
temperatures below 0 °C, please observe the
following:
■ Use nitrogen 5.0 for the pressure test.
During evacuation, take suitable steps to keep
■
the surface temperature of the refrigerant lines
above 0 °C.
Danger
Direct contact with refrigerant can be harmful to
skin.
Wear safety goggles and protective gloves when
working on the refrigerant circuit.
A
C
D
Fig. 48 Example type AWT/AWT-AC 221.A07
Internal unit
A
Hot gas line
B
External unit
C
50
B
E
F
E
G
K
L
H
M
!
Please note
Escaping refrigerant will cause environmental
pollution.
■ Before evacuating the refrigerant lines and the
internal unit, check all connections for tight-
ness with leak detection spray.
Keep the valves on the external unit shut, and
■
fill the system with nitrogen through the serv-
ice valve. The test pressure is the max. per-
missible operating pressure.
N P Q
Service valve (Schrader valve)
D
In type AWT/AWT-AC 241.A05 and
AWT/AWT-AC 241.A07 the service valve is located
at the connection of the liquid line.
Fill valve
E