Filling The System; Water Treatment - Worcester Greenstar i Series Installation, Commissioning And Servicing Instructions

COMMISSIONING
1.
Fig. 61 Syphon connection
▶ Referring to figure 62, check pressure relief drain pipe (1) is correctly
fitted and securely tightened.
Fig. 62 Pressure relief drain pipe
NOTICE: If the boiler is not to be commissioned
immediately then, after successfully completing all of
the checks and any rectification work:
▶ Close the gas valve
▶ Close the water shut off valve
▶ Isolate the gas supply
▶ Isolate the electricity supply
▶ Label appropriately
5.2

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.
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Fig. 63 Venting
5. Vent all radiators, tighten 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 instructions 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. 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.
5.3

WATER TREATMENT

NOTICE:
▶ ARTIFICIALLY SOFTENED WATER MUST NOT BE
USED TO FILL THE CENTRAL HEATING SYSTEM.
ENSURE THAT THE SYSTEM HAS BEEN CLEANED AS ON PAGE 9 OF
THESE INSTRUCTIONS.
FLUSHING (Central Heating):
▶ Switch off the boiler.
▶ Open all drain cocks and drain the system while the appliance is hot.
▶ Close drain cocks and add a suitable flushing agent at the correct
strength for the system condition in accordance with the
manufacturer's instructions.
▶ Run the boiler/system at normal operating temperature for the time
stated by the manufacturer of the flushing agent.
▶ Drain and thoroughly flush the system to remove the flushing agent
and debris.
INHIBITOR (Central Heating):
▶ 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.
▶ Fill system via a WRAS approved filling loop to between 1 and 2 bar.
▶ Vent all radiators; tighten vents when complete.
▶ Vent any air from the boiler heat exchanger using a suitable container
to collect any water.
▶ 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. Vent all radiators.
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