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© Baxi Heating UK 2012
8.3
Flushing and Filling the pipework (cont)
11. Pour an amount of the solar heat transfer fluid into the filling
pump.
12. Close the fill and drain valve - safety group (Fig. 19 Item 1) and
the fill and drain valve - flow meter (Fig. 19 Item 2) and pressurise
the pump slightly prior to filling the system. If an electric pump is
being used follow the instructions with the pump.
13. Fully open the fill and drain valve on the safety group (Fig 19,
item 1) and pump fluid into the system. Whilst pumping, open the
flow meter drain valve (Fig 19, item 2) slightly to allow the air to
vent out of the system.
14. When the pump is down to approximately 1 litre isolate the
fill and drain valves. Vent the filling pump and refill with solar heat
transfer fluid.
15. Re-pressurise the filling pump and repeat steps 3 and 4 above
until fluid is seen discharging from the drain valve on the flow
meter. (Fig 19, item 2). Close the drain valve.
16. Continue filling at the fill and drain valve on the safety group
(Fig 19, item 1) until the system pressure reaches 2 bar.
17. At this point the circulation pump should be vented. If the
system pressure drops, repressurise using the procedure above.
18. After venting the pump and checking that the system pressure
is 2 bar, close the fill and drain valve on the safety group (Fig. 19
Item 1), and check the system for leaks.
19. Turn the left hand isolating valve (Fig 19, item 4) back 45°
clockwise until the dot on the bezel is back at 12 o’clock.
20. Turn the right hand isolating valve (Fig. 19 Item 5) back 90°
clockwise until the dot on the bezel is back at 12:00 O’clock.
21. Turn the slot of the adjusting screw (Fig. 19 Item 3) back to
the horizontal position.
8.0
Commissioning of system
