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Installing the solar pump station | 11
6 720 811 270 (2015/04)AGS10-2, AGS10E-2, AGS20-2, AGS50-2
Connect the expansion vessel [3] in the return on the solar pump
station's safety assembly.
Fig. 16
[1] Pressure relief valve
[2] Flexible stainless steel hose from the connection set (available as
accessory)
[3] Expansion vessel
5.5.3 Adjusting the pre-charge pressure of the expansion vessel
To make use of the maximum possible volume:
Set the pre-charge pressure when the vessel is not subjected to load
(i.e. no fluid pressure).
If the calculated pre-charge pressure is higher or lower than the
factory-set pre-charge pressure (see table 7, page 11), correct the
pre-charge pressure accordingly.
5.6 Connecting pipework and pressure relief valve
discharge pipe to the solar pump station
Cut the pipes to length and push them as far as possible into the
compression fitting [1].
Route the discharge pipe [2] from the pressure relief valve so that any
discharge can be seen to empty out into the holding container [4] and
secure it in place with a pipe clip [3].
Maintain an air break.
Fig. 17 Connection to solar pump station
[1] Compression joints on all four outlets
[2] Discharge pipe (not supplied)
[3] Pipe clip (on site)
[4] Empty solar fluid container (holding container)
[5] Connection bracing points
The pre-charge pressure of the expansion vessel is
calculated based on the static system head
1)
plus an
allowance.
Calculate and set pre-charge pressure to at least
1.2 bar.
Flat plate Evacuated tube
Static height
1)
1) A one metre difference in height (between collector array and solar pump station)
equates to 0.1 bar
(10 m) 1.0 bar (10 m) 1.0 bar
+ allowance + 0.4 bar + 1.7 bar
= expansion vessel pre-
charge pressure
= 1.4 bar = 2.7 bar
Table 7 Example: collector-dependent pre-charge pressure
6720801165.16-2.ST
1
2
3
WARNING: Injuries and system damage due to hot heat
transfer medium.
Make sure the discharge pipe size is at least that of the
pressure relief valve (maximum length = 2 m and
maximum of 2 bends).
To tighten the lower compression fittings, you can brace
against the points marked [5] using a 27 mm spanner or
pipe wrench.
7747006489.49-2.ST7747006489.49-2.ST
3
141
1
1
2
5
11


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