1
4
Pull lever (C) up and push to the left to
move the diverter valve to the mid-position
between ports A and B.
4
Push and hold lever (C) down to lock.
2
4
Loosen the tank automatic air vent cover.
4
The pump automatic air vent has a
protective cover that must remain in place,
this auto air vent needs no adjustment
before filling the boiler.
3
4
Check and if required, adjust the expansion
vessel pressure using the Schraeder type
valve (D).
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.
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.
4
4
Open all system and radiator valves.
4
Turn on the water main stop cock.
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 (E).
4
Bleed air from the pump using the
pump bleed screw.
5
4
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.
4
Push lever (C) to the left and pull
upwards to allow the lever to return
position A.
4
Leave the lever (C) unlocked at
position A.
FILLING THE SYSTEM
1
3
6
B
A
C
B
A
C
D
4
E
2
Total system
volume (litres)
180
107
138
Initial system
pressure (bar)
0.5
1.0
1.0
Initial charge
pressure (bar)
0.5
0.5
1.0
FILLING THE SYSTEM
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE 12/18-18/25-25/32
6 720 802 432 issue A 04/2012
33
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