Operation; Maintenance - Baxi DN 25 Installation And Operating Instructions For The Specialised Installer

Bleeding the pump
1. Position the ball valves of the solar station as
shown in illustr. 6.13 (angular position of the
thermometer handle in the supply: 90°, return: 0°).
Illustr. 6.13 Ball valve position pump bleeding
2. Switch on the flushing and filling station.
3. Open the upper ball valve of the flow measuring
and regulating device by turning the adjustment
screw into vertical position (illustr. 6.14).
Illustr. 6.14 Position adjustment screw
4. Close the draining ball valve of the flow measuring
and regulating device and the ball valve of the
safety group after about 1 minute.
5. Switch off the flushing and filling station.
6. Set the check valves to operating position.
14
6.5 Setting of the system pressure
Once flushing is complete, the diagram expansion tank
has to be connected to the connection set respectively
the safety group. The required inlet pressure of the
diaphragm expansion tank has to be determined first
and the tank has to be filled with nitrogen accordingly.
The required inlet pressure of the
diaphragm expansion tank as well as the
system pressure depends on the spatial
and performance-related parameters of the
solar plant.

7 Operation

7.1 Bleeding the system
Before initial operation, the system must be filled and
bled with due consideration of the permissible
operating pressures.
Illustr. 7.1 Bleeding at the vent pot (transmission
station with deaerator)
7.2 Correction factors for mixtures of water and
glycol
The correction factors of the manufacturers of the
antifreeze liquids have to be considered when setting
the volume flow.

8 Maintenance

The station is maintenance-free.
Tightness and function of the station and its
connection points have to be checked regularly during
maintenance. The station must be easily accessible.