Evacuating The Refrigerant Lines And Internal Unit - Viessmann Vitocal 200-S Installation And Service Instructions Manual

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.
C
D
Fig. 44 Example type AWB/AWB-AC 201.B04
Internal unit
A
Hot gas line
B
External unit
C
Service valve (Schrader valve)
D
In type AWT-AC 241.A07 the service valve is loca-
ted at the connection of the liquid line.
Fill valve
E
Shut-off valve
F
Liquid line
G
!
B
E
F
E
G
K
L
H
M
H
K
L
M
N
Commissioning, inspection, maintenance
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.
A
N P Q
Fill hose between pressure gauge set and external
unit
Pressure gauge set
Connection hose between pressure gauge set and
vacuum pump
Vacuum pump
Connection hose between pressure gauge set and
vacuum gauge
45