The System; Water Treatment - Worcester GREENSTAR 24i Junior Installation Instructions Manual

COMMISSIONING
5.3 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-clockwise to close.
4. Vent (1) any air from the boiler heat exchanger using
a suitable container to collect any water. Ensure tube
outlet (2) 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.
Fig. 60 Venting
5. Vent all radiators, tighten when completed and check
the system and correct any leaks.
B 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.
B 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 with the extra expansion vessel.
6. If required increase system pressure back to 1 bar.
7. Rotate the adjustable pointer on the pressure gauge
to record the set system pressure.
8. Isolate and remove filling loop connection to system
or if using the optional integral filling connection (not
supplied with the boiler) remove the key and place in
its storage position on the bottom cover of the boiler.
An optional filling loop: 7 716 192 281 is
available to fill the system (not supplied
with the boiler).
5.4

WATER TREATMENT

NOTICE:
B ARTIFICIALLY SOFTENED WATER MUST
NOT BE USED TO FILL THE CENTRAL
HEATING SYSTEM.
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ENSURE THAT THE SYSTEM HAS BEEN CLEANED AS
ON PAGE 11 OF THESE INSTRUCTIONS.
FLUSHING (Central Heating):
B Switch off the boiler.
B Open all drain cocks and drain the system while the
appliance is hot.
B Close drain cocks and add a suitable flushing agent at
the correct strength for the system condition in
accordance with the manufacturer's instructions.
B Run the boiler/system at normal operating
temperature for the time stated by the manufacturer
of the flushing agent.
B Drain and thoroughly flush the system to remove the
flushing agent and debris.
INHIBITOR (Central Heating):
B Check drain cocks are closed and all radiator valves
are open before adding a suitable inhibitor
compatible with aluminium (or combined inhibitor/
anti-freeze if the system is exposed to freezing
conditions) to the heating system water in
accordance with the manufacturers instructions.
The pH value of the system water must be
less than 8 or the appliance warrantee will
be invalidated.
B Fill system via a WRAS approved filling loop to
between 1 and 2 bar.
B Vent all radiators; tighten vents when complete.
B Vent any air from the boiler heat exchanger using a
suitable container to collect any water.
B Ensure tube outlet is directed away from the fan or
any other electrical component to prevent damage.
Also place a suitable cover over the fan to prevent any
spillage of water onto electrical connections. Ensure
the cover is removed after venting.
B Vent all radiators.
B Re-pressurise if necessary to 1bar.
B Set all controls to maximum.
B Record the date when the inhibitor was added to the
system on the warrantee card.
NOTICE:
B The concentration of inhibitor in the
system should be checked every 12
months or sooner if system content is
lost.
B The adding sealing agents to system
water is not recommended, this can
cause problems with deposits in the heat
exchanger.
6 720 644 741a (2010/10)