Tuxhorn tubra-PGS XL, Assembly And Operating Instructions Manual

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Code no. 977.25.02.00
Dated 06/2018
- 12 -
8 F i l l i n g , f l u s h i n g a n d d r a i n i n g
Filling
In order to fill the solar system the supply and re-
turn ball valve [1, 2] must be set to the "gravity
brake open" position (45°). Rotate the flow meter
spindle [B] to the "S" position. The slot is now hori-
zontal, while the flat section points to the left.
Connect the filling hose to the boiler filling and
drain valve [4a].
Connect the drain hose to the boiler filling and
drain valve [4b].
Open the boiler filling and drain valves and fill the
solar energy system.
Please note:
Do not exceed the maximum filling and flushing
speed of 40 l/min, as this could damage the com-
ponents.
Flushing To flush the solar energy system turn the supply
and return ball valve [1, 2] to the "gravity brake
open" position (45°).
Rotate the flow meter spindle [B] to the "S" posi-
tion. The slot is now horizontal, while the flat sec-
tion points to the left.
Open the boiler filling and drain valves [4a, 4b] and
start the flushing procedure.
Flushing the pump
Set the spindle [B] on the flow indicator to the flow
position. The slot is now vertical, while the flat sec-
tion points downwards. The air that is still trapped
in the pump can now rise to the top.
Adjust the spindle so that it is horizontal again and
flush the solar energy system until the residual air
is expelled from the system.
If no flow rate is visible on the flow indicator after
conducting the flushing procedure,

conduct a
controlled flush.
Draining
To drain the solar system set the supply and return
ball [1, 2] valve to the "gravity brake open" position
(45°). Turn the spindle [B] to the "flow" position.
The slot is now vertical, while the flat section points
downwards. Open the boiler filling and drain valve
[4b].