TRK
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Inserting the replacement tube
Now take up the new tube. Push the coaxial pipe into the header connection and push
the tube onto the header. Ensure that the plastic pieces run properly in the tongue and
groove of the adjacent parts. Push the tube simultaneously at the top and bottom onto
the collector retainers. Ensure that the tube is not lifted out of the collector level. Risk
of breakage.
Secure the tube at the top of the header by pushing the plastic slider supplied inwards.
If you have undone one of the M8 screws, retighten it now.
Replace the cover with insulation and secure it with the screws previously removed.
At the foot end, push the retaining plate behind the fixing rail towards the tubes again
so they are held in place; then retighten both screws at the bottom fixing rail.
Restarting the system
Observe the installation instruction for the system as a whole when taking
the system into use again.
Carry out a leak test before taking the system back into use, and completely ventilate
the collector and solar circuit. Manual fill pumps are unsuitable for this purpose; this
task requires a jet pump (at least 800 W, 40 m head). The fill pressure should be 0.5
bar higher than the expansion vessel inlet pressure.
Run the pump on pre-purge for at least 30 minutes and start/stop it several times. For
this, the heat transfer medium must flow through a fill & drain valve, fitted into the
return between the heat exchanger and the circulation pump into a container and from
there back into the system, propelled by the jet pump.
The system is properly ventilated when no more bubbles appear in the returning
medium for a longer period of time.
The collector can now be taken into use again, subject to being free of airlocks.
If required, it may need to be ventilated again after a few days.
