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FILLING THE SYSTEM
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 24 i junior/28 i junior
8 716 107 336b (11/05)
30
COMMISSIONING
FILLING THE SYSTEM
1 Turn on the water main and open the
system valves.
2 Open all radiator valves.
3 Fill the system via a WRAS approved filling
loop to 1 bar then turn the valve anti-clock-
wise to close.
4 Vent (A) any air from the boiler heat
exchanger using a suitable container to
collect any water. Ensure tube outlet (B) is
directed away from the fan or any other
electrical component to prevent any water
damage. Also place a suitable cover over
the fan to prevent any spillage of water
on to electrical connections. Ensure the
cover is removed after venting.
5 Vent all radiators, retighten when completed
and check the system and correct any leaks.
• The boiler integral expansion vessel is pre-
charged to 0.75 bar (equal to a static head
of 7.5m (22ft). A Schraeder type valve is
fitted to the expansion vessel to allow for
pressure adjustment if 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 instruc-
tions with the extra expansion vessel.
6 Briefly open the pressure relief valve to test
its operation.
7 If required increase system pressure back to
1 bar.
8 Rotate the adjustable pointer on the
pressure gauge to record the set system
pressure.
9 Isolate and remove filling loop connection to
system or if using the optional integral filling
connection (C) (not supplied with the
boiler) remove key (D) and place in
its storage position (E) on the bottom cover
of the boiler.
• A pre-filling kit 7 716 192 282 is available for
installations where the boiler will not be fitted
immediately to the heating system. This
allows the heating system and mains water
connections to be filled and checked prior to
boiler installation.
This kit can be used in conjunction with the
optional filling loop 7 716 192 281(not sup-
plied with the boiler).
A
B
C
D
E