Filling The System - Worcester Greenstar Heatslave 12/18 Instruction Manual

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FILLING THE SYSTEM

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INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE 12/18-18/25-25/32
FILLING THE SYSTEM
1 Pull lever (C) up and push to the left to
move the diverter valve to the mid-position
between ports A and B.
Push and hold lever (C) down to lock.
2 Loosen the tank automatic air vent cover.
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 Sealed systems only; 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.
Total system Initial system Initial charge
volume (litres) pressure (bar) pressure (bar)
180 0.5
107 1.0
138 1.0
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 Open all system and radiator valves.
Turn on the water main stop cock.
Open vented systems only; turn on the
water to the system feed and expansion
cistern and allow the system to fill.
Sealed systems only; 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.
Check air is being discharged from the
automatic air vents.
Vent all radiators, retighten when completed,
check the system and correct any leaks.
Bleed air from both of the secondary heat
exchanger air vents (E).
Bleed air from the pump using the
pump bleed screw.
5 Sealed systems only; 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.
Rotate the adjustable pointer on the
pressure gauge (fitted to the control panel
fascia) to record the set system pressure.
6 Check system and rectify any leaks.
Push lever (C) to the left and pull
upwards to allow the lever to return
position A.
Leave the lever (C) unlocked at
position A.
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