4 Commissioning [specialist]
2017/05
99609x4x5-mub-en – V05
15
Airstop
The Airstop with manual vent valve is used to vent the solar
installation. To ensure a perfect ventilation of the solar circuit,
the flow velocity must be at least 0.3 m/s in the flow line.
Pipe diameter [mm]
Flow rate at 0.3 m/s
∅ outside
∅ inside
l/h
l/min
15
13
~ 143
~ 2.4
18
16
~ 217
~ 3.6
22
20
~ 339
~ 5.7
28
25
~ 530
~ 8.8
The air separated from the solar fluid is collected in the upper part of the Airstop and can be
released at the vent plug [j].
WARNING
Danger of scalding due to vapour escape!
The escaping fluid can have a temperature of more than 100 °C and cause
scalding.
Carefully open the vent plug and close it again, as soon as medium
escapes.
Venting the solar thermal system after commissioning
At the beginning, vent the solar installation daily and then weekly or monthly,
depending on the vented air quantity. Thus, an optimum operation of the solar
installation is ensured. Check the system pressure after venting and increase it to the
specified operating pressure, if necessary.
j
