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INST
ALLA
TION
16
Connecting the solar expansion vessel
Mount the solar expansion vessel (Fig 11 Item 5) adjacent to the hydraulic station so that the vessel can be connected to the
vessel connection of the safety group (Fig 11 Item 3) using the flexible pipe (Fig 11 Item 6) supplied. (Note: Solar expansion
vessel, mounting bracket, self sealing connection and flexible pipe are supplied in the Ancillary Components kit).
The vessel must be mounted as shown (connection to top) and securely supported using the bracket supplied. The self sealing
vessel connection should be screwed onto the vessel connection before connecting the flexible pipe (Fig. 16 Item 5).
DO NOT replace the solar expansion vessel with either a potable water expansion vessel or boiler sealed system vessel.
The charge pressure of the solar expansion vessel must be adjusted (when the fluid circuit is empty or de-pressurised) to a
pressure equal to the static head + 0.4 bar, or a minimum of 1.2 bar. (NOTE: the static head is the height difference between
the highest point in the pipework (collector) and the hydraulic station in metres x 0.1 bar. The charge pressure should not
normally exceed 1.9 bar – see also Commissioning of the hydraulic station (page 24).
Connecting pipework
Connect the flow and return pipes from the solar collector panels / tubes to the pump station via compression fittings (Fig 11,
below). Fittings are for 22mm o/dia pipe. Support the hydraulic assembly when tightening connections.
Figure 11
3
2
5
6
4
1
Flow
from
panel
Return
to
panel
Flow
to
cylinder
Return
from
cylinder
To a suitable container
(e.g. Solar fluid discharge vessel
Accessory N o. 720294601)
.
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