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© Baxi Heating UK 2012
8.0
Commissioning of system
8.1
Air Test
1. An air test may be used on the pipework to detect any gross
leakage prior to flushing and filling with solar heat transfer fluid.
Pressurise the system to a maximum of 1 bar to check for leaks.
2. Ensure that the solar expansion vessel pre-charge pressure
has been set prior to flushing and filling.
8.2
Flushing and Filling the pipework
1. Before the system is commissioned the pipework must be
flushed to remove any contaminants.
This must be done using
the solar heat transfer fluid as it will be impossible to fully
drain all parts of the system.
2. Connect the flushing pipes to the fill & drain valve on the
safety group (Fig. 19 Item 1) and to the fill & drain valve on the
flow meter (Fig. 19 Item 2).
3. Open the fill & drain valves.
4. Turn the slot of the adjusting screw (Fig. 19 Item 3) in the
return so the slot is vertical to open the non-return valve.
5. Turn the left hand isolating valve with integral thermometer in
the flow (Fig. 19 Item 4) in the direction indicated by the arrow
(to a 45° position) to open the non-return valve.
6. Ensure that the right hand isolating valve with integral
thermometer in the return (Fig. 19 Item 5) is open indicated by
the dot on the thermometer bezel being at the top.
7. Turn the slot of the flow meter adjusting screw (Fig. 19 Item
6) in the return vertically to open the flow limiter (Fig. 19 Item
7).
8. Flush the solar primary pump by pumping the fluid into the
system via the fill and drain valve on the safety group (Fig. 19
Item 1).
9. Close right hand isolating valve (dot on thermometer bezel at
9 o’clock position). Flush solar primary pipework and collector
via the fill and drain valve on the safety group.
If reusing flushed
fluid ensure this is filtered before re-introducing into the
system.
(see Fig. 20). Use a suitable container of a large enough
volume to collect the fluid.
10. When satisfied that all pipework and component parts have
been thoroughly flushed, the system can be filled.
4
5
3
6
7
Fig. 19
Fig. 20
Fig. 21
Solar fluid
Filling pump
Filter
1
2
1
3
2
45°
Read at top
of float
