6
3. Pressure increasing
A.
Pressure increasing with draining and charging of previously determined volume of fluid
1. Fill the solar system as described in previous chapter. Calculate the volume of fluid inside
the solar system
2. Determine the Discharge Volume from the right column of the table below
B. Pressure increasing with air compressor
1. Ensure the solar thermal circuit is properly filled with glycol/water mixture, as previously
described
2. Close all valves. Connect the Air Compressor to Leaking Valve.
3. Make sure the pressure in compressed air is bigger than the pressure in solar circuit.
4. Slowly, partial open the Leaking Valve and add compressed air slowly until system
pressure increases for 0,5 bars.
5. Close the Leaking Valve.
6. System is ready to run.
3. Open the Filling Valve, open Leaking Valve and Discharge previously detemined volume.
4. Close the Leaking Valve.
5. Fill the discharged volume back into the solar system.
6. Pressure is increased.
In order to avoid vacuum appearance during the pump operating, it is important to add 0,5 bars to
the filled system. There are two ways to do it:
Volume of fluid filled in the solar system
Discharge Volume
20 l
10 l
21 l ÷ 40 l
20 l
41 l ÷ 60 l
30 l
61 l ÷ 80 l
40 l
81 l ÷ 100 l
50 l
