9.
Filling a Solar Thermal System
For filling a solar thermal system, the ball valve above the pump must be closed and the ball valve
below the pump open. The open/closed position is indicated by a groove on the ball valve. If the
groove is pointing horizontally, the ball valve is closed; if it is pointing vertically, the ball valve is open.
See the fig. below (the grove position is marked in red).
The ball valves are operated by means of a lever handle. During normal operation, both are in the
open position. To fill the solar thermal system, close the ball valve above the pump by turning the
lever handle clockwise by a quarter turn. After filling the solar thermal system, turn the lever handle
counter
-
clockwise to re-open the valve.
Prior to commissioning the system, both the ball valves must be open!
open
the groove is pointing
horizontally
closed
the groove is pointing
vertically
the ball valve above the pump
the ball valve below the pump
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