Function Of The Gravity Brakes; Fill/Drain Fitting - Velux PSKR Mode D'emploi

Function of the Gravity Brakes (1/2)

Opening pressure of the gravity brakes: 20 mbar
each.
The gravity brakes are integrated in the flow and
return ball valves. They are operated by turning the
handles of the ball valves.
To prevent gravity circulation, the valve discs should
not be vented. The gravity brakes are in operating
position (closed). The slots in the handles are in a
vertical position (Figure 3a).

Fill/Drain Fitting (6)

Use the fill and drain valves on the fill/drain fitting
to fill and drain the solar system (Figure 4).
To drain the system, the slot in the spindle must be
in a horizontal position (Figure 4b).
Figure 3a: Ball valve open.
Figure 4a: Drain Fitting
completely open.
INStRUCtIoNS FoR INStAllAtIoN AND USE
To fill and completely empty the solar system, open
the gravity brakes by turning the handles to the
right. The slots in the handles are positioned at an
angle of 45° (Figure 3b).
Turn the handles to the right by a total of 90°.
The slots in the handles are in a horizontal position.
The ball valves are closed (Figure 3c).
Figure 3b: Gravity Brakes open.
Figure 4b: Drain Fitting closed.
Figure 3c: Ball valve closed.
15 VELUX