Pressure Test, Filling And Flushing The System; Flushing And Filling; Pressure Test - Meibes M Technische Anleitung

4. Pressure test, filling and flushing the system

The following work must only be carried out by trained specialists. When pressure testing, filling, and flushing the system, it must be
ensured that all shut-off valves are open. The collectors must be cooled down and covered to prevent injuries or damages! The system
should be filled during the morning or evening hours on days with high levels of solar radiation. Do not perform any switching operations
with the shut-off valves to release pressure.

4.1 Flushing and filling

The system must be flushed according to the system requirements.
All dirt and air particles must be removed from the
system before it is commissioned. If water is used to flush the
system, it must be completely drained if there is a risk of freezing
temperatures and it must be immediately replaced with
suitable and approved solar fluid with antifreeze (cf. Section 3.2).
Caution (cf. Section 3.2):
• Upper shut-off valves: open (position 2)
• Lower shut-off valve: flushing position (position 1)
When filling the system, it must be ensured that the lower
shut-off valve at the volume flow meter is set to position 1 (cf.
Section 3.1) and the ball valve must be set to 113 °F (45 °C)
(position 2). This position opens the backflow preventers.
• Once the system is filled, open the upper and lower shut-off
• valves (cf. Section 3.2)! Caution (cf. Section 3.2):
• Upper shut-off valves : automatic (position 1)
• Lower shut-off valve : open (position 2)

4.2 Pressure test

Contacts, components, and connections must be checked for leaks. In case of leaks, drain and repair the system and repeat the pressure test.
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