Pressure Test, Filling And Flushing The System; Flushing And Filling; Pressure Test; Bleeding - Meibes M Technische Information Für Montage Und Betrieb

4. Pressure test, filling and flushing the system

The following work must be carried out only by trained specialist personnel.
When pressure-testing, filling and flushing the system, care must be taken to ensure that all shut-off valves are opened. The collectors must
have been allowed to cool down and must be covered, in order to avoid injury or damage! On very sunny days, filling should be carried out in
the early morning or evening. Do not attempt to relieve the pressure with the aid of the shut-off valves.

4.1 Flushing and filling

The system must be carefully flushed when necessary. All dirt
particles and air must be removed from the system before
starting. If water is used for flushing, the system must be
completely drained in case of any risk of frost at the
installation point, and refilled immediately with suitable and
approved solar fluid containing anti-freeze agent.
Note (see Section 3.2):
�
Feed (from collector): opened with inactive return
�
Return (to collector): opened with active return
The shut-off valves and ball valve handle must be opened
during filling. The return (to the collector) must be opened
with an active non-return valve and the feed (from the collector)
must be opened with an inactive non-return valve. Set the
ball valve handle in the feed line to 45° (see Section 3.2.). In
this position the non-return valve will be opened. The collectors
must be covered in order to avoid injury or damage!
On completion, open the shut-off valves (see Section 3.2.)!

4.2 Pressure test

Check all connections and components for integrity. In case of leaks, drain the system, repair the leak and repeat the pressure test.

4.3 Bleeding

Incorrect bleeding will result in a drop in pressure and can cause faults in the solar system. The temperature of the escaping air and heat carri-
er medium can exceed 60 °C, causing increased danger of burning. The bleed point is located at the highest point of the system.
After careful and correct bleeding, the system pressure must be brought back up to operating pressure!

4.4 Draining

When draining the system, the handles of the ball valves must be set to 45 °C (see Section 3.2), before draining the system at the lowest
point. In this position the non-return valves are opened. Take care to ensure that the piping system is completely drained.
The heat carrier fluid should be collected in a suitable container and disposed of environmentally-friendly in compliance with the instructions
issued by the manufacturer of the heat carrier fluid.
Note: The system will usually be under pressure! Danger of burning!
Hoses
Filling station
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