14 The diverter valve will sit in mid-position
when the boiler has no demand and is
powered up.
24 Loosen the flow pipe manual air vent
screw.
34 Check and if required, adjust the expansion
vessel pressure using the Schraeder type
valve (A).
The charge pressure of the built-in 12 litre
expansion vessel is 0.5 bar as dispatched,
which is equivalent to a static head of five
metres. At 1 bar pressure the vessel will
provide 107 litres expansion capacity, the
boiler has a primary water capacity of between
62 and 64 litres and therefore additional
system expansion capacity may be required.
If an extra expansion vessel is fitted to the
central heating return, adjust this to the same
pressure as the appliance internal expansion
vessel, refer to separate instructions supplied
with the extra expansion vessel.
44 Open all system and radiator valves.
4 Turn on the water main stop cock.
4 Close the flow pipe manual air vent when
water is vented.
4 Fill the system to between 1 and 2 bar
pressure via a WRAS approved filling link.
Monitor the pressure gauge during venting
and repressurise if required.
4 Check air is being discharged from the
automatic air vents.
4 Vent all radiators, retighten when completed,
check the system and correct any leaks.
4 Bleed air from both of the secondary heat
exchanger air vents (B) and flow pipe air
vent.
4 Bleed air from the pump using the
pump bleed screw.
54 Connect a suitable hose to the Heatslave
tank drain.
Open the drain valve to reduce the system
to the correct pressure, then close the
drain valve. Ensure safe disposal of the
discharge.
6 4 Check system and rectify any leaks.
FILLING THE SYSTEM
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