Install Instructions

12
6 Air vent
The Air vent (manual bleed valve) is for bleeding the solar fluid in
the solar thermal system. The air precipitated from the solar fluid
gathers in the upper area of the manual bleed valve (see diagram)
and can, if required, be discharged at the bleeding valve. To
guarantee faultless bleeding of the collector circuit the flow rate in
the flow must be at least 1 f/s (0.3 m/s).
Check the system pressure after bleeding and if necessary increase
it to the specified operating pressure.
Danger:
During bleeding the escaping air and solar fluid can
reach temperatures of over 212°F (100°C).
Bleeding the solar thermal system directly after commissioning:
At first you should bleed the solar thermal system daily and then weekly or monthly, depending
on the volume of discharged air.
Information for operators of solar thermal systems:
Bleed the solar thermal system twice a year with the manual bleed valve to achieve optimal
efficiency.